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How to remedy damaged parts in asphalt mixing plant? - 31 Oct 2019 09:00

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As we all know, the asphalt mixing plant is in use, due to the complicated situation on the spot, so under the influence of various factors, this or that kind of problem may occur.

Some user friends may not have rich production experience, so when they encounter some problems, they may not be able to handle them well.

So, let's share some of the experience and skills of asphalt mixing plants today to better help you solve some problems at an early date.

Below we will share the contents of the summary for your reference.

First of all, for different problems, we need to analyze for specific reasons, and then take corresponding measures to deal with.

For example, if some parts of the asphalt mixing plant have fatigue damage, how can we deal with it? In this case, the best solution is to start with the manufacturing of these parts, such as improving the surface finish of the parts, and by some methods to reduce the stress concentration of the parts, etc., to improve the parts. performance.

In this way, the probability of fatigue damage of the parts can be effectively reduced during use.

There is also a situation. If these parts are simply friction problems during the production process, what should be done? There are two ways to solve this problem: 1. When using these parts, try to use wear-resistant materials; 2. When designing the shape of the parts used in these asphalt mixing stations, you should also consider reducing The problem of frictional resistance.

Of course, one of the problems we need to pay attention to is corrosion, because corrosion is one of the important reasons for the damage of asphalt mixing plant parts.

For this problem, we should take the approach of using some corrosion-resistant materials to plate the surface of metal parts, or applying oil on the surface of metal parts, to prevent corrosion of parts. - Comments: 0

How is the asphalt mixing plant fuel system improved during the development process? - 28 Oct 2019 09:00

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In the work of the asphalt mixing plant, there are many work aspects involved, and its fuel system is a very important aspect.

We know that the main function of the fuel system is to complete the heat exchange and ensure the work.

The specific process is such that the heat transfer oil in the fuel system needs to enter the heat exchanger first, then heat the fuel oil inside, and then return to the heat transfer oil furnace; thus repeating the cycle heating to complete the asphalt mixing station for heating Process requirements.

In the past construction process, heavy oil production was used. However, when heavy oil is burned, many gas pollutants are generated, which will adversely affect the environment. If natural gas is used as fuel, there will be no pollution after combustion. So it is getting popular.

In 2013, the “oil to gas” transformation process was started on the asphalt mixing plant.

That is to say, natural gas is used as a raw material to replace the conventional heavy oil fuel.

The reason for the transformation is that because of the use of natural gas, there are three outstanding advantages that are not available in heavy oil fuel. The specific content is: First, the quality of asphalt finished products in asphalt mixing plants has been improved, which is due to the burning of heavy oil. Completely, mixing with asphalt results in lower asphalt adhesion; secondly, the service life of the filter bag is prolonged, because the natural gas is relatively full during combustion, so it is relatively simple to filter, reducing the cost of concern; Third, the price of natural gas is more stable and economical, so it can also save the company a lot of production costs.

So, how is it transformed? The specific transformation contents of the asphalt mixing plant include: 1. The heat transfer oil used for heating the asphalt is transported to the heat exchanger through the oil pump and the pipeline, and the heating process of the fuel oil is completed to make the viscosity meet the requirements; The oil is heated before it enters the nozzle, which improves the fuel efficiency. - Comments: 0

Analysis of common problems and maintenance of bag filter in asphalt mixing plant - 25 Oct 2019 09:00

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In the production process of asphalt mixture, there are often some factors that affect the quality of its production. For example, the asphalt deduster at the asphalt commercial station will discharge emissions due to a large amount of high-temperature gas and dust, so the dust collector must be Proper and effective treatment can ensure its normal operation and meet emission requirements.

Bag filter has great advantages, such as strong adaptability, simple structure and stable operation, so it is widely used in the treatment of emissions.

However, the bag filter still has a large number of deficiencies, and it must be properly maintained to ensure its efficient operation.

I. Characteristics analysis, working principle and influencing factors of bag filter
The bag filter is a device used for effectively cleaning the emissions of the asphalt mixture during production. It is usually in bulk and has a combination of a base, a casing, an inlet and outlet chamber, a bag, and a pulse.

1, the characteristics of the bag filter.

China's transportation production industry often uses dust collectors, not only because of the independent production and longevity of the dust collector, but also its other advantages. The specific advantages are: one of the advantages of the bag filter is its dust removal efficiency. High, especially for the treatment of sub-micron dust, because its processing object is not very demanding, so the smoke content and dustiness have little effect on the dust collector, so the bag filter can be A wide range of applications.

In addition, the maintenance and repair work of the bag filter is simple and easy to operate.

2, the working principle of the bag filter.

The bag filter has a simple working principle, and the dust in the flue gas can usually be effectively treated by the self-contained bag. This treatment method has mechanical control, so the clean air is discharged while intercepting the dust. The intercepted dust is collected into the funnel and then discharged through the system piping.

The bag filter is easy to operate and easy to disassemble and maintain, so it is widely used in the treatment of organic waste gas treatment emissions.

3. Factors affecting the bag filter.

The bag filter has a limited service life, and in order to extend the life of the dust collector, it is necessary to eliminate the fault in time.

There are two factors that often affect the normal use of the bag filter, namely the frequency of dust cleaning and bag management.

The dust removal frequency will affect the service life of the bag filter. If the frequency is too high, the bag of the dust collector will be damaged. Usually, the filter bag of the dust collector should be coated with a filter bed to extend the service life of the filter bag.

Insufficient daily care of the bag will also affect the service life of the bag filter. Usually, certain precautions should be taken, such as preventing the bag from being wet, preventing the bag from being exposed to direct sunlight, and preventing the bag from deteriorating.

In addition, in the operation of the bag, the temperature of the exhaust smoke should reach the normal standard, and only in this way can the bag filter be operated efficiently and the service life can be prolonged.

Second, the bag filter is often used in the process of using the problem
1. The pressure difference in the bag is high but its dust removal ability is very low.

(1) Hydrocarbon pollutants remaining in the bag.

The source of the contaminated bag does not need to be determined at the first time, and the influencing factor is most likely a fuel problem. If the fuel in the bag is oil, it is prone to various problems, especially for heavy oil or waste oil. It is said that the viscosity of the oil is often increased because the temperature of the combustion is too low, and eventually the fuel cannot be fully burned, thereby contaminating the bag, causing a series of problems such as blockage and deterioration, which affect the service life of the bag. It is beneficial to improve the working efficiency of the bag filter.

(2) The cleaning of the bag is not enough.

In the usual dust removal work, the bag of the dust collector should be cleaned frequently to prevent the pressure difference from rising due to the cleaning failure. For example, in the initial setting, the normal pulse duration is 0.
25s, the normal pulse interval is 15s, and the normal air pressure should be controlled at 0.
5~0.
Between 6Mpa, the new system has three different pulse intervals of 10s, 15s or 20s.

However, because the cleaning of the bag is not in place, it will directly affect the pressure and cycle of the pulse, which will cause the bag to wear, shorten the service life of the bag filter, affect the normal production of the asphalt mixture, and reduce the efficiency and level of road construction.

2. Dust emissions will occur during the cleaning of the pulse in the bag.

(1) Excessive cleaning of the bag pulse.

Because the dust on the bag pulse is excessively cleaned, the dust particles on the surface of the bag are not easy to form, which affects the normal operation of the bag pulse, so that the pressure difference of the bag fluctuates, which reduces the service life of the bag filter and should be moderately reduced. The cleaning of the bag pulse ensures that the pressure difference is stable between 747 and 1245 Pa.

(2) The replacement of the cloth bag is not timely and the aging is serious.

The use period of the bag is limited, which may cause problems in the use of the bag due to various reasons, affecting the normal operation of the bag filter, such as excessive temperature, chemical corrosion, bag wear and the like.

The aging of the bag will directly affect the efficiency and quality of the discharge. Therefore, the bag must be inspected regularly, and the aging bag should be replaced in time to ensure the normal production of the bag filter and improve the quality of its work.

3. Corrosion of the bag.

(1) Chemical corrosion, such as sulfur in fuel, often occurs during the operation of the baghouse.

If the concentration of sulfur is too high, it will easily corrode into the bag of the dust collector, resulting in rapid aging of the bag, thus reducing the service life of the bag filter.

Therefore, it is necessary to control the temperature of the bag filter so as to effectively avoid the condensation of moisture therein, because the sulfur dioxide generated by the fuel during the combustion process and the condensed water form sulfuric acid, resulting in an increase in the concentration of sulfuric acid in the fuel.

It is also possible to directly use a fuel containing a low concentration of sulfur.

(2) The temperature of the bag filter is too low.

Because the bag filter will easily condense moisture when the temperature is too low, the formed moisture will cause the parts in the bag filter to rust, resulting in rapid aging of the dust collector, and at the same time, remaining in the bag filter. The chemical corrosion component becomes more intense due to the condensed moisture, which greatly damages the components of the baghouse and reduces the service life of the baghouse.

3. Maintaining the problems frequently encountered in the operation of the bag filter
1. Effectively treat hydrocarbon pollutants that often appear in bags.

Because the temperature of the fuel is too low, the fuel is not burned enough, and a large amount of hydrocarbon pollutants remain, which affects the normal operation of the bag filter. Therefore, the fuel should be properly preheated to a viscosity of 90 SSU or more. The low standard is followed by the next step of burning.

2. Deal with the problem of insufficient bag cleaning.

Due to insufficient cleaning of the bag, the pulse pressure and cycle of the bag are deviated. Therefore, the pulse interval can be reduced first. If the air pressure is to be increased, the air pressure should not exceed 10 MPa, thereby reducing the wear of the bag and prolonging the bag. Service life.

3. Dealing with the problem of excessive cleaning of the bag pulse.

Because the excessive cleaning pulse will affect the normal operation of the bag filter, it is necessary to reduce the number of times of cleaning the pulse, reduce the cleaning intensity, and ensure that the pressure difference of the pulse is controlled within the range of 747 to 1245 Pa, thereby reducing the dust of the bag pulse. emission.

4. Deal with the problem of aging of the bag in time.

Because the bag is easily affected by residual chemical contaminants, and the wear of the precipitator bag is accelerated due to excessive temperature during operation, the bag should be strictly inspected regularly, and replaced if necessary to ensure the dust collector. The bag is in normal operation.

5. Effectively control the concentration of the chemical constituents of the fuel in the bag.

If the concentration of the chemical component is too high, it will directly cause a large amount of corrosion to the bag, and accelerate the aging of the bag member. Therefore, it is necessary to effectively control the moisture condensation by avoiding an increase in the chemical concentration, and to operate by increasing the temperature of the bag filter.

6. Deal with the confusion of the differential pressure meter in the bag filter.

Because the pressure difference tube will often appear in the bag filter, in order to reduce leakage, it is necessary to protect the differential pressure pipe of the domestic sewage treatment device, and use a more robust and reliable differential pressure tube. - Comments: 0

Technical advantages and disadvantages of asphalt mixing plants - 22 Oct 2019 09:00

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If you look at the asphalt mixing station from a professional point of view, do you know how to judge its work and significance? In fact, the so-called asphalt mixing station is the production of asphalt. We can usually see it in the work of road construction. Specifically, some materials that need to be used in the construction process are mixed according to a certain proportion. Then complete the corresponding construction work.

Then, we can analyze from the perspective of the market. Since it was used in the market, it has been well received by users. Today's asphalt mixing plant technology has been greatly improved, and the whole set of equipment has many advantages. For example, in the course of work, stable control, precise screening, efficient dust removal, excellent mixing, and environmental protection are required.

It is more obvious when used in large-scale projects such as high-grade roads and airports.

Above, we have also raised the aspect of green environmental protection. The issue of environmental protection is also an important issue that has been widely concerned in various fields in recent years.

The asphalt mixing station has a rare advantage base in energy conservation and environmental protection, as well as recycling and reuse, and has played this characteristic well in practical work.

In fact, in China, the development of this industry has not started since the 1990s. It is now a small peak. I believe that in the future development, it will usher in even greater development.

In addition to the above advantages, we must also mention that it is also more convenient to operate, very convenient for today's construction requirements.

Even we can understand that, to a certain extent, the asphalt mixing station has made up for the shortcomings of the large station field, and now plays an important role in road construction and maintenance work.

However, if we want to further expand its influence, we need to make further efforts to improve the technical performance and quality of the equipment, and at the same time improve the quality of postoperative services.

To do this, the asphalt mixing station will shine even more brightly in the future market. - Comments: 0

Installation and commissioning of asphalt mixing plant equipment - 19 Oct 2019 09:00

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With the development of China's economy, road construction has also been greatly developed. In the construction of highways, higher requirements are put forward for the construction quality of the project.

China's highway construction has gradually achieved mechanization, and the development of construction mechanization can greatly reduce the labor intensity, greatly shorten the construction period, and to a certain extent also reflect the modernization of highway construction level.

Mechanization of road pavement includes three main processes of mixing, paving and rolling, and mixing is an important guarantee for ensuring construction quality.

In the mixing process, the asphalt concrete mixing equipment is the first element that determines the progress of the project and the quality of the project. It plays an irreplaceable role in highway construction.

Because it combines a variety of technologies such as mechanical, electrical and automation.

I. Introduction
As an important equipment in highway construction, asphalt concrete mixing plant integrates technologies of various technologies such as mechanical, electrical and automation.

Technically speaking, the maintenance of the asphalt mixing plant is a very important task.

In the construction, we refer to the asphalt concrete mixing building as the asphalt building. Its production capacity, automation degree and measurement accuracy of the control system, and energy consumption rate of the sewage treatment equipment have become the main factors to measure the performance of the asphalt building.

In terms of the installation of the asphalt station, the main contents of the asphalt station assembly include component foundation fabrication, assembly of mechanical metal structures, installation and commissioning of electrical systems, and installation of asphalt heating and piping.

On the basis of the foundation construction of the asphalt building, the mechanical metal structure can be installed in one step, and there will be no major changes and adjustments in the actual production operation in the future.

The main job of the asphalt heating and piping section is to heat the asphalt. The part of the installation is mainly determined by the equipment that heats and stores the asphalt.

In actual production, the stability of the electric drive and control system has become an important factor in the normal production of asphalt buildings.

Second, the installation of asphalt station
1. Site selection
(1) Due to the large workload of large asphalt mixing stations, the floor space requirements are very high.

To fully consider the type of equipment in the construction and the storage capacity of the stone, we should try to choose the vicinity of the middle section of the construction section when considering the site, and also consider whether the source of water and electricity can be guaranteed, transporting raw materials and finished products. It is convenient to get in and out of the asphalt station.

(2) The choice of the external environment of the site should also be noted that the natural conditions should be dry, the terrain should be slightly higher, the groundwater level should be avoided too high, and the geological conditions of the site should be fully understood when site selection to avoid geological conditions. Poor, the gravity of the equipment caused the terrain to sink and deform the equipment.

(3) In the case of simultaneous construction of multiple roads, the easiest way to choose the most suitable location is to calculate various costs and determine the address by the average distance.

2, layout
After site selection, reasonable layout planning should be carried out for the entire construction site. Boiler energy-saving renovation Due to the wide variety of equipment required for large-scale asphalt mixing stations, it mainly includes mixing mainframes, asphalt storage facilities, finished material warehouses, thermal oil furnaces, and barrel removal machines. , distribution room, cable trench, double-layer asphalt pipeline layout, car electronic scale and construction vehicle parking space, equipment maintenance workshop, laboratory and stone mixed material yard; after the start, there will be more than a dozen The raw materials and finished materials enter and exit the mixing station. We must carry out scientific and reasonable planning and layout of the site to avoid unreasonable layout and interfere with the normal construction order.

3, installation
1. Preparation for the installation
(1) Before all the auxiliary equipment and the complete equipment of the mixing station are transported to the construction site, we must draw the overall location map, and ensure that the lifting is successful during the installation process. This is very important if it occurs. A second lifting will result in an additional increase in overall costs.

(2) At the installation site, it should meet the installation requirements and do what we mean by "three links and one leveling".

(3) The installation team must have experience so that it can cope with some problems that arise during the installation process.

2. Supporting facilities required for installation of equipment
1 small car for purchasing and daily office, 1 for 35t and 50t cranes, 1 for 30m long ropes, 10m for retractable ladders, 1 piece, and some common crowbars, sledgehammers, hand saws, electric drills , grinders, crimping tools, various wrenches, seat belts, level gauges and other tools, a ZL50 loader.

3, the order of installation
We generally install in the following order, asphalt auxiliary facilities (boiler) → mixing station → dryer → powder machine → aggregate hopper bag dust collector → cold lift → total distribution → finished product warehouse → central control room → wiring.

4, other work
Since road construction is generally in the summer, when we use some electronic equipment, we should install lightning rods, lightning arresters and other devices to ensure the normal use of electronic equipment.

Third, after the installation of debugging
In the initial assembly of the mixing station, it takes a lot of time and effort to adjust the test machine. There are many problems in the debugging. In the mechanical part, we mainly solve the electrical parts, such as wiring errors, components and The installation position of the control unit is not suitable, the system parameters are not matched, and the like.

In the specific commissioning phase, we have to deal with it according to the actual situation.

1. Preparation before commissioning
In all equipment installations, the staff should check all the wiring before commissioning, and check with the ring paper one by one, use the shaker to check the insulation degree of the motor, and timely deal with the problems, mechanical engineering personnel To check the operation of the mechanical equipment, it is necessary to manually turn it for one week to confirm that there is no card, scraping, grinding or bumping in each link, and add appropriate lubricating oil or grease, adjust the tightness of the transmission belt, and check the connection part. The tightness of the screw.

The test can only be carried out after all electrical and mechanical operations have been carried out.

2, the precautions in debugging
In the commissioning, we should closely observe whether the instrument signal corresponding to each motor is normal, whether the operation button can be used effectively, whether the running direction of each motor is correct, whether the motor can ensure the running of the belt does not occur and slip. phenomenon.

Whether there is a leak in the cylinder work.

In the event of a problem, we should immediately stop the machine and check for malfunctions to ensure that the components of the equipment are in optimum condition.

If all the motors can work normally, we will enter the manual control for the no-load test run. When there are many conditions, the automatic no-load test will be carried out.

Fourth, the precautions during the test run
When the no-load debugging is normal, the load-bearing load test can be performed.

Carefully observe whether the discharge is normal.
Whether the measurement of the electronic scale can be accurately weighed, whether the monitoring system of the input and output of the computer is operating normally, and whether the automation system is operating normally.

When these problems are solved, you can try the mix.

After all the above work is correct, the earth can be buried.

During the construction, it is necessary to ensure that the sanitary environment of the site can be delivered to normal use after reaching the standard.

V. Conclusion
The installation and maintenance of the asphalt mixing plant circuit equipment can not only ensure the quality of the project, but also reduce the cost of the whole project and maximize the construction efficiency. In the process of construction, the electrical circuit should be inspected at any time to avoid safety. The accident happened to strive for a double harvest of social benefits and economic benefits. - Comments: 0

What are the outstanding features of asphalt mixing plant in terms of technology? - 16 Oct 2019 09:01

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At present, a large amount of asphalt is used during road construction and railway construction, and the quality of asphalt production directly affects the construction effect. In order to improve the quality of asphalt production, the processing industry will pay attention to the selection of equipment when making asphalt.

asphalt mixing plant is developed with advanced production technology. The equipment has many advantages, so it can achieve better production results after the application, ensuring the production and quality of asphalt.

Before purchasing the asphalt mixing plant, the user can have a certain understanding of the working principle and production technology of the equipment, so that it can be more convenient and convenient during the asphalt production and production through the equipment.

The asphalt mixers currently on the market are designed to be more rational in terms of structure, and the module design method is adopted. This module design can avoid complicated application of the equipment, simplify the operation process, and does not require a lot of labor and complexity during installation and use of the equipment. Operation, so the asphalt mixer has a relatively large advantage in terms of structure.

In addition, when using asphalt mixing plant, there is no need to worry about the problem of too large product area. In the past, many processing units affected the other processing procedures because of the large equipment used, and the asphalt mixer was installed and used. This problem can be avoided, and the equipment has a small footprint, so it has been widely recognized by users.

Now the number of users installing asphalt mixing plant using our LONTTO GROUP is constantly increasing. Because the advanced technology can be used to achieve better application efficiency, this equipment has begun to gain more attention from users, and the application range of future equipment. There will be more room for improvement. - Comments: 0

Formation, influence and solution of heat transfer oil coking in asphalt mixing plant - 13 Oct 2019 09:01

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I. Introduction
Compared with traditional heating methods such as direct heating and steam heating, heat-conducting oil heating has the advantages of energy saving, uniform heating, high temperature control precision, low operating pressure and safety.

Therefore, since the 1980s, the development and application of China's heat transfer oil has developed rapidly. It has been heated in various industries such as chemical and chemical, petroleum processing, petrochemical, chemical fiber, textile, light industry, building materials, metallurgy, grain and oil food processing. Widely used in the system.

This paper mainly discusses the formation, hazards, influencing factors and solutions of coking during the use of heat transfer oil.

Second formation of coking
There are three main chemical reactions in the heat transfer process: thermal oxidation, thermal cracking and thermal polymerization.

Coking occurs from thermal oxidation reactions and thermal polymerization reactions.

The thermal polymerization reaction occurs because the heat transfer oil is heated during the operation of the heating system, and the reaction generates macromolecular high-boiling substances such as condensed aromatic hydrocarbons, colloids and asphaltenes, which are gradually deposited on the surface of the heater and the pipeline to form coking.

The thermal oxidation reaction mainly occurs because the heat transfer oil in the expansion tank of the open heating system contacts the air or participates in the circulation, and the reaction generates low molecular or high molecular alcohol, aldehyde, ketone, acid and other acidic components, and further generates colloid. Viscous materials such as asphaltenes, and finally coking; thermal oxidation is caused by abnormal conditions. Once it occurs, thermal cracking and thermal polymerization will be accelerated, the viscosity will increase rapidly, heat transfer efficiency will decrease, and overheating and furnace tube coking will occur.

The resulting acid can also cause corrosion and leakage of equipment.

Three coking hazards
The coking caused by the heat transfer oil will form a heat insulation layer, and the air flow pulverizer will cause the heat transfer coefficient to decrease, the exhaust gas temperature to increase, and the fuel consumption to increase; on the other hand, since the temperature required for the production process remains unchanged, the heating furnace The temperature of the pipe wall will rise sharply, causing the furnace tube to bulge and rupture, and finally the furnace tube will be burned through, causing the furnace to ignite and explode, causing serious accidents such as equipment and operator personal injury.

In recent years, such accidents have not been common.

Four factors affecting coking
(1) Heat transfer oil quality
Through the analysis of the formation process of the above coking, it is found that the oxidation stability and thermal stability of the heat transfer oil are inseparable from the coking speed and quantity.

Many fire and explosion accidents are caused by poor thermal stability and oxidation stability of the heat transfer oil, causing severe coking during operation.

(2) Design and installation of heating system
Whether the various parameters and equipment provided by the heating system design are reasonable and directly affect the coking tendency of the heat transfer oil.

The installation of each device is different, which will also affect the life of the heat transfer oil.

Equipment installation must be reasonable, and timely rectification during commissioning is beneficial to extend the life of the heat transfer oil.

(3) Daily operation and maintenance of the heating system
Different operators have different objective conditions such as education level and technical level. Even if the same heating equipment and heat transfer oil are used, the control level of the heating system temperature and flow rate are not the same.

Temperature is an important parameter for thermal oxidation reaction and thermal polymerization of heat transfer oil.

As the temperature increases, the reaction rate of the two reactions increases sharply, and the tendency to coke increases.

According to the relevant theory of chemical engineering principles: as the Reynolds number increases, the coking rate slows down.

The Reynolds number is proportional to the flow rate of the heat transfer oil.

Therefore, the larger the flow rate of the heat transfer oil, the slower the coking.

Five coking solutions
In order to slow down the formation of coke and extend the mission of using heat transfer oil, measures should be taken from the following aspects:
(1) Select a suitable grade of heat transfer oil to monitor the trend of physical and chemical indicators
The heat-conducting oil is divided according to the highest operating temperature. The mineral-type heat-conducting oil mainly has three grades of L-QB280, L-QB300 and L-QC320, and the maximum use temperatures are 280 ° C, 300 ° C and 320 ° C, respectively.

The heat transfer oil of the appropriate grade and quality conforming to the SH/T 0677-1999 “heat transfer fluid” standard should be selected according to the maximum heating temperature of the heating system.

At present, the recommended maximum use temperature of some commercially available heat transfer oils is quite different from the actual measurement results, which is misleading to the user, and safety accidents occur when it occurs, which should attract the attention of the majority of users!
Heat transfer oils formulated with refined heat-stable refined base oils and high-temperature antioxidants and anti-scaling additives should be used.

The high temperature antioxidant can effectively delay the oxidation thickening during the operation of the heat transfer oil; the high temperature antiscalant can dissolve the coke in the furnace tube and the pipeline, disperse it in the heat transfer oil, and finally pass through the bypass filter of the system. Filter it to keep the tubes and tubing clean.

After three months or six months of use, the heat transfer oil should be traced and analyzed for its viscosity, flash point, acid value and carbon residue. When two of them exceed the specified limit (the residual carbon is not more than 1.
5%, acid value is not greater than 0.
When 5mgKOH/g, the flash point change rate is not more than 20%, and the viscosity change rate is not more than 15%), it is considered to add some new oil or all oil change.

(2) Reasonable design and installation of the heating system
The design and installation of the heat transfer oil heating system shall strictly implement the design rules of the hot oil furnace formulated by the relevant state departments to ensure the safe operation of the heating system.

(3) Standardize the daily operation of the heating system
The daily operation of the heat transfer oil heating system shall strictly implement the safety technical supervision procedures of the organic heat carrier furnace formulated by the relevant state departments, and monitor the changing trend of the temperature and flow rate of the heat transfer oil in the heating system at any time.

In actual use, the average temperature at the outlet of the furnace should be at least 20 ° C lower than the maximum temperature of the heat transfer oil.

The temperature of the heat transfer oil in the expansion tank of the open system should be lower than 60 °C, and the maximum temperature should not exceed 180 °C.

The flow rate of the heat transfer oil in the hot oil furnace should not be lower than 2.
5 m / s, to increase the degree of thermal oil turbulence, reduce the thickness of the stagnation bottom layer and convective heat transfer in the heat transfer boundary layer, improve the convective heat transfer coefficient, and achieve the purpose of enhancing fluid heat transfer.

(4) Cleaning of the heating system
The thermal oxidation and thermal polymerization products first form a polymeric high carbon viscous material that adheres to the tube wall and can be removed by chemical cleaning.

The high carbon viscous further forms incompletely graphitized deposits, and chemical cleaning is only effective for parts that have not been carbonized.

Fully formed graphitized coke.

Chemical cleaning of such substances has not solved the problem, and mechanical cleaning is often used abroad.

It should be checked frequently during use. When the formed high carbon viscous material has not been carbonized, the user can purchase a chemical cleaning agent for cleaning.

Six conclusions
1.
The coking caused by the heat transfer oil during heat transfer is derived from the reaction products of the thermal oxidation reaction and the thermal polymerization reaction.

2.
The coking of the heat transfer oil causes a problem of a decrease in the heat transfer coefficient of the heating system, an increase in the exhaust gas temperature, and an increase in fuel consumption, which may cause accidents such as fire, explosion, and personal injury of the operator.

3.
In order to slow the formation rate of coking, a heat-conducting oil formulated with a refined heat-stable refined base oil and a high-temperature anti-oxidation and anti-scaling additive should be selected.

For the user, the product whose maximum use temperature is determined by the authority's inspection should be selected.

4.
Reasonable design and installation of the heating system, the daily operation of the heating system should be standardized during the use, and the viscosity, flash point, acid value and carbon residue of the heat transfer oil during operation should be checked regularly to observe the change trend.

5.
A chemical cleaner can be used to clean the coking that has not been carbonized in the heating system. - Comments: 0

Asphalt mixing station dust collector selection - 10 Oct 2019 09:00

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Asphalt mixing station dust collector dust parameters are very complicated, so it is very important for the performance requirements of the bag filter. Let us first look at how to choose the asphalt concrete mixing station bag filter, and then we will study the determination of the dust bag.

Design and equipment selection of dust removal system for asphalt concrete mixing plant
1) For asphalt concrete mixing plants, the pollution sources are usually combined and blended, and the single-column hydraulic machine is designed with a dust removal system.

The dust removal process adopts a two-stage dust removal method of a cyclone (or inertia) dust collector and a bag filter; the front cyclone dust collector collects coarse dust and hot sparks as an aggregate recycling; the rear stage bag filter collects particles. Dust and purify harmful gases, and collect dust as mineral powder into a mixer for recycling.

The two stages can be combined into one.

2) The aggregate dry flue gas and the asphalt stirring flue gas should be blended as early as possible before the pre-duster, and the asphalt tar is adsorbed by the lime powder and the aggregate.

An emergency field damper and a temperature control alarm device are arranged in front of the bag filter. - Comments: 0

Do you know the advanced features in the asphalt mixing plant control system? - 07 Oct 2019 10:05

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We know that in the asphalt mixing plant, which includes different systems, each system has different division of labor, and these systems work together to keep the work of the asphalt mixing plant in a stable state.

Among them, there is a system called control system. In fact, there are still many advanced functions in the control system. For these advanced functions, I don't know how much you know.
If you are not sure, it doesn't matter, let's talk to you now about what advanced features are included in the asphalt mixing plant control system.

The specific contents include: industrial control computer, I/O acquisition and high-precision weighing system in the control system.

In the work, it can combine the production process and quality requirements, under the function of the control software, realize the automatic control of data collection and production, and record the production data information in real time.

In addition, data management is possible, and multiple production reports can be queried and printed.

Through the understanding of these contents, it is presumed that everyone now has a clear understanding of the advanced functions included in the asphalt mixing plant control system.

In short, the hardware configuration of the system is scientific, the overall stability is good, the function is powerful, and the operation is simple.

For the user, it is not only convenient to use, but also significantly improves work efficiency.

So, what are the specific functional characteristics of the asphalt mixing plant control system? In order to facilitate everyone to better understand and learn, we have specifically summarized these contents, and now share the content to everyone: 1, automatic moisture conversion function; 2, batch data can be automatically converted to reduce the workload, while reducing Error rate; 3, automatic compensation, automatic deduction and automatic adjustment of the parameters of the ingredients, improve the accuracy of the ingredients; 4, automatic continuous production function, significantly improve work efficiency.

The asphalt mixing plant we mentioned before is complicated in its work. The knowledge involved is very wide. Therefore, we should pay more attention to this knowledge, which will not only help the smooth completion of the work, but also improve our working ability. . - Comments: 0

Analysis on the role of construction equipment management in asphalt mixing plant - 04 Oct 2019 09:00

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With the rapid development of mechanized construction, there are many hidden problems, and if we want to solve these problems, we need to be able to manage and organize the construction machinery in a scientific and reasonable way.

For enterprises, the management of asphalt mixing plant equipment is also an important part of the production work of the enterprise, and it has important significance.

We must understand this, that is, the management of the asphalt mixing plant equipment is mainly to ensure that it can achieve good equipment efficiency and investment results, and finally the company's production and operation objectives can be achieved.

As an important field in enterprise management, there are many aspects to the management of asphalt mixing plant equipment. Let us introduce them separately.

First of all, the management of asphalt mixing plant equipment belongs to the basic work of enterprise production management.

As we all know, at the time of construction, we basically rely on various mechanical equipment to carry out operations.

In order to ensure the smooth completion of the work, we hope that in all aspects of production, we can get strict connection and cooperation according to the standards.

Obviously, the continuity and balance of the production process is based on the normal operation of the mechanical equipment. Therefore, the management of the equipment can complete the construction plan on time.

In addition, the management of asphalt mixing plant equipment is also the basic condition for ensuring the quality of the project.

It can be said that the quality of engineering construction companies depends on the survival.

The completion of the project is basically guaranteed by equipment.

If the technical condition of the equipment is not good, it is likely to result in poor engineering quality and even result in impossibility of work.

The last aspect is that the management of asphalt mixing plant equipment is also an important way to ensure the economic benefits of enterprises.

In simple terms, the quality of equipment management will not only affect the output of the enterprise, but also directly affect the investment and feedback of the enterprise, so it is an important factor in the economic benefits of the enterprise. - Comments: 0

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