Jining Yanzhou District Dongtai Machinery Co., Ltd.

Not long ago, a robbery with a knife occurred near Wuxi Huishan Wanda Plaza. Wuxi police arrested two suspects within hours of the incident.
Ms. Ge said that when she just walked to the car after get off work, she pressed the car key and was about to open the door when two men suddenly jumped out from behind and put a knife on Ms. Ge's neck. Ms. Ge was very frightened when she was robbed. This was not only because her hands and feet were tied with tape by the robber and she was restrained in the back seat, unable to move. What made her even more frightened was that the moment she drove, Ms. Ge Stepped forward and committed the robbery.
Yes, the other party also took a knife and forced her to reveal her bank card password. Ms. Ge recalled that when she was controlled by the robber in the back seat, she kept bending over and lowering her head. She did not know the direction of the car. However, on the way, the robber stopped the car twice because he was looking for a bank cash machine. Yuan was taken away.
Prevention and Control Methods of Dust in Coal Conveying Systems of Thermal Power Plants
&In today’s coal mining industry, the export volume is increasing, but is the environmental aspect in place? have? No? Well, whether there is or not, the editor of Dongtai has brought you good news. Readers, please take a look below!
&The dust generated by the coal conveying system not only causes environmental pollution, affects workplace hygiene and the visibility of the centralized remote monitoring system, accelerates mechanical wear, destroys electrical insulation, and may even cause explosions or fire accidents. What's more, What is serious is that after the dust is inhaled into the body, it penetrates into the alveoli and adheres to the lung lobes, causing people to suffer from occupational diseases and endangering the health of employees. Therefore, effective prevention and control of dust in coal conveying systems is the focus of fuel work.
Classification of locations and causes of dust
Fine, dry coal is prone to dust
There is no doubt that fine, dry coal is more likely to generate dust due to its smaller volume and moisture content. Dust will cause greater harm. When the surface water content of fine coal is below %, the dust is larger. When the surface water content is between % and %, the dust is smaller. When the surface water content is greater than %, dust is generally not seen. When the surface water content is between % and %, dust is generally not seen. %, it is easy to cause coal sticking or even blockage in the coal drop pipe. If the weather is dry, the dust will be more obvious.
.Dust is generated by powder spraying in the guide trough
Excessive drop in the coal drop pipe is one of the main reasons for powder spraying in the guide trough. During the transfer process of each belt conveyor in the coal conveying system, the coal passes from one belt to the other. The machine head falls into the guide trough of the next belt conveyor, and the drop is very large. The greater the drop, the greater the positive pressure-induced wind formed when the coal falls. When the guide groove is not tightly sealed, powder spraying will become more serious. The powder spraying positions of the guide trough are: ①Powder spraying in the gap connecting the guide trough. ② Coal is dropped and powder is sprayed on the glue next to the guide trough. After the side glue is worn, it is not in close contact with the belt. The coal flow rushes out of the side glue or is sprayed out of the guide trough under the action of induced wind, which will cause serious coal leakage and dust. . ③The volume of the guide trough is too small, the positive pressure induced wind speed is too fast, the dust settlement is poor, and even the tail of the guide trough is sprayed with powder. ④The dust collector cannot generate slight negative pressure at the outlet of the guide trough, causing powder spraying at the outlet of the guide trough.
. Dust is generated when the dust collector is working
When the dust-laden gas enters the dust collector from the air inlet, it first hits the inclined plate and baffle in the middle of the air inlet and outlet, and the airflow turns to flow into the ash hopper. The air flow speed slows down, and due to inertia, the coarse dust in the gas flows directly into the ash hopper. During the operation of the dust collector, if the emissions exceed the standard and the operating pressure of the dust collector is too low than designed, it is most likely that the initial powder layer on the surface of the filter bag is insufficient. The reason may be that the filtration speed of the filter bag is too high, the The cleaning cycle is too short, the pressure of compressed air injection is too high, the dust loadability is reduced, etc.
.Dust is generated at the return belt and tensioning roller
The source of dust here is mainly coal sticking on the working surface of the belt. It is divided into two parts. One is that the cleaner installed on the head of the belt conveyor cannot completely clean up the coal sticking; the other is the coal sticking on the uneven surface of the belt that is worn and cracked. The pulverized coal adhered to the belt is affected by shaking and air-drying during operation, causing dust. When the sticky coal reaches the tensioning weight drum, dust is generated due to the stretching, redirection and movement of the belt. If there is a cleaner scraper, Broken and worn, the dust becomes more obvious.
. Dust is generated at the rear drum of the belt conveyor
When coal is spread in the guide trough, powder is sprayed, and when the sampler scrapes coal, part of the coal falls on the return belt. When it reaches the rear drum, it is squeezed and crushed by the drum. Rotation produces a large amount of dust
Prevention and control methods of dust in coal conveying systems in thermal power plants
. Controlling a certain humidity of coal can control the dust of fine and dry coal
& Controlling the humidity of coal can effectively reduce Dust from the coal conveying system. Generally speaking, fine coal with a surface water content of less than % cannot be clumped into clumps, and will produce dust when blown lightly. Fine coal with a moisture content of % to % can be clumped into clumps but quickly disperse, and dust and moisture will not be produced when blown. Fine coal above % can not only be clumped into balls but will not fall apart. The moisture content that causes sticking and clogging of burning coal is % to %. Outside this range, the cohesive force decreases significantly, so it is most appropriate to control the moisture content at % to %.
.Dust removal method for closed guide trough.
The closed guide trough is an improvement on the belt support structure of the original ordinary belt conveyor, allowing the material to run in a closed channel to prevent the dust concentration in the spreading environment from reaching the required level, which greatly reduces the maintenance workload. Due to its simple use The reliable structure and closed guide chute can be maintained without maintenance all year round.
The working principle of the closed guide trough: This dust removal device generates a large amount of negative pressure airflow during the falling process of the material. The airflow is divided by the segmented design in the guide trough, so that the impact dust generated during the operation is collected The damping device realizes the full release of negative pressure and positive pressure alternating cycles, so that the induced wind can realize curved movement in it, accelerating the cyclic impact, and the dust-containing gas is suppressed, relieved, knocked down and other processes to achieve automatic dust removal.
.Dust control of dust collector
Depending on the size of the dust collector, there may be several sets of pulse valves, controlled by a pulse controller or C. Each time a set of pulse valves is opened to remove the part of the bag or bag it controls The dust in the filter cartridge, while other cloth bags or filter cartridges work normally, to control the resistance within a certain range, the filter bag must be cleaned. When cleaning, the pulse controller sequentially triggers each control valve to open the pulse valve. , the compressed air in the air bag is sprayed into each corresponding filter bag through the venturi tube of each hole in the blow pipe. The filter bag expands rapidly instantly, causing the dust accumulated on the surface of the filter bag to fall off, and the filter bag is regenerated. The cleaned dust falls into the ash hopper and is discharged from the machine through the ash discharge system. As a result, the dust accumulated on the filter bag is periodically pulse-injected and cleaned, allowing the purified gas to pass normally and ensuring the operation of the dust removal system.
Methods to prevent and control dust at the return belt and tensioning drum
& Regular inspection and maintenance to ensure the function of the first-pass cleaner, second-pass cleaner, tail empty section cleaner and counterweight front empty section cleaner , so that the cleaner blade is in close contact with the tape. Use high-quality composite polyurethane cleaner scraper, which has a small friction coefficient, good elasticity, long-lasting wear resistance, does not damage the tape, and has a better cleaning effect.
A spray humidification device is added to the return working surface of the belt head, and a wiper cleaner is installed to remove tiny coal deposits on the return belt, which can very effectively prevent dust from the return belt and the tensioning drum. The spray humidification device uses the belt spray dust suppression water source and starts synchronously with the belt operation. Cleaning devices include drainage channels, wipers, fan nozzles, solenoid valves, filters, pipe valves, etc.
.Methods to prevent and control dust from the tail drum
The original empty section triangular cleaner that was adjusted by bolts was transformed into a self-weighted triangular cleaner, and a powder receiving box was installed at the place where the pulverized coal removed by the cleaner falls. , clean regularly.
A material receiving and dust removal device is installed at the position where the tail drum throws materials, which can well catch the coal particles and coal powder at the drum, effectively reducing the secondary flying of dust.
.Prevention and control methods for dust generated during transportation of coal flow
Use the original guide trough spray dust suppression system to spray the coal surface in the guide trough in front of the outlet of the guide trough, and use fan-shaped nozzles , cover the coal surface with a layer of water to reduce dust during coal flow operation, or install a large nozzle at the outlet of the guide trough, set a ball valve to adjust the water volume, and cover the coal surface with a layer of water film, which not only humidifies the coal The flow reduces dust and prevents spray water vapor from being inhaled by the dust collector.
Pay attention to dust supervision
Regularly conduct dust inspections on the coal conveying system. The causes of serious dust parts should be analyzed, the root causes should be found, and treatment should be carried out until they are qualified. Strengthen inspections and promptly log defect work orders when coal leakage, powder spraying, and dust are discovered to ensure equipment integrity.
Only by paying attention to dust control and strengthening dust supervision is the key to good dust control. Always paying close attention to equipment and dust control is the basis for good dust control.
Conclusion
In short, dust prevention and control in the coal conveying system is a complex and arduous task. We must attach great importance to and strengthen the supervision of dust prevention and control. At the same time, we must constantly explore new technical methods to improve the prevention and control effect. . Only by preventing and controlling the problem of dust pollution can we create good environmental conditions for civilized production in power plants, create a healthy working atmosphere for employees, optimize the use environment of equipment, extend the service life, and improve the economic benefits of the enterprise.
! This is the information the editor has prepared for you. Do you want to try it? If there is, then I will tell you a place to make guide troughs, which is south of Lilou Village on Taiyanghuandao, Xinyan Town, Yanzhou District, Jining City, Shandong Province. Ludong Dongtai Machinery is there! The quality of the guide trough there is quite good. If you don’t believe me, come and take a look!
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