How to Remove Dust from Coal Handling System in Thermal Power Plant

Introduction: Coal-fired power plant coal transport systems often produce dust. The rising coal dust contains free silica. After inhalation, these free silica deposits in the lungs, causing fibrous lesions. Lung tissue gradually hardens, causing silicosis. Coal dust falls on mechanical rotating parts and accelerates mechanical wear. When it falls on electrical equipment, it can cause poor contact of electrical equipment and cause electrical equipment to fail to control. In order to ensure the health of coal-transmission workers, ensure the safe production of coal-fired power plants, and extend the service life of power plants, coal-conveying systems must undergo comprehensive dust management.

How to Remove Dust from Coal Handling System in Thermal Power Plant

In order to solve the phenomenon of dust in thermal power plants, it is necessary to adopt appropriate technologies and proceed from the actual situation to improve and optimize the existing technologies. First of all, we must optimize the design of the head funnel. By minimizing the impact angle, the flow of coal can be controlled, and the generation of impact force and accumulation can be reduced as much as possible, and the funnel structure can be developed in the vertical direction so that the conveyor system can flow slowly downwards. The direction of coal flow is consistent with that of the conveyor, which effectively mitigates the occurrence of dusting.

The design of the central curve coal-removal pipe, through a three-dimensional computer model, determines its geometric structure, minimizes the impact angle and force, and maintains momentum balance as much as possible. The falling coal pipe can adopt inertial flow technology to design and set the damping device, which can greatly reduce the induced wind produced when the coal flow falls. It can solve the dead corner and control the flow speed and flow shape of the coal flow to achieve the desired effect:

1. The coal flows along the coal-falling pipe to form a bundle, which greatly reduces the probability of fine particles spreading into the air to form dust.

2, coal flows without impact, coal, coal and pipe wall collision, fine particles will not "splash" into the air to form dust

3, greatly reduce the wear of coal pipe, the liner life is extended to 3 to 5 times. The flow rate of coal flow is controlled within a certain range to reduce induced wind production and dust.

The feed trough is mounted at the bottom of the coal drop tube for receiving the coal stream and placing it on the receiving conveyor belt. The groove is designed for guiding the material so that the direction of movement of the coal stream is the same as that of the conveyor belt, and its speed is close to that of the conveyor belt. It can direct the gathered coal flow to the center of the receiving conveyor belt at an appropriate speed and from an appropriate angle, thereby reducing impact on the conveyor belt, wear, dust generation, eccentric loading and wear of the wear-resistant liner and other problems.

Another advantage of unloading through the chute is the reduction of the conveyor support structure required in the unloading zone conveyor belt. During the running of the conveyor belt, loading the conveyor belt at the same speed and in the same direction can reduce the impact on the conveyor belt and reduce the need for buffer beds and buffer rollers. This design allows the coal flow rate at the discharge point to be essentially the same as that of the belt conveyor, reducing dust generation.

By improving the sealing characteristics of the feed trough and providing a non-powered dust removal unit in the feed trough, it is ensured that when the induced wind speed at the outlet of the trough is reduced below 2.5 m/s, the unpowered dust removal unit can stabilize the airflow and reduce the airflow. Speed, optimize the stability of dusty air and the deposition of floating dust. In the unpowered dust removal unit, we usually use a high, covered curtain to allow the dust to settle out of the air, and most of the dust will return to the main material layer and will not leak outside.

The above is the method of anti-blocking and dust removal in the coal transportation system. In most regions of China where the climate is mild and the rainfall is abundant, power plant dust and other problems will inevitably occur during the operation of the power plant. As long as we take a long-term perspective and make good use of new technologies to make corresponding efforts, then we can improve the coal transportation system environment, increase the efficiency of coal-fired trans-shipment, and reduce operational and maintenance costs.

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