System and method for clearing powder deposits in pulverized coal bunkers using adjacent boiler negative pressure

Abstract

The invention discloses a system and method for clearing powder deposits in pulverized coal bunkers using adjacent boiler negative pressure. The system comprises a first boiler and a second boiler, and each boiler comprises a combustor, a pulverized coal exhauster, a coal mill, a coal bucket, a coal feeder, a coarse powder separator, a fine powder separator, a wood scrap separator, a pulverized coal bunker, a powder pipe pulverized coal isolation valve, a pulverized coal feeder, a powder pipe air volume regulation valve, a primary air bellow, a wind powder blender, a powder pipe air volume and air speed measuring device, a powder pipe adjacent boiler isolation valve and so on; according to the method, effective transportation of pulverized coal between the pulverized coal bunkers of the two boilers is achieved, and after one of the boilers stops, the powder deposits in the pulverized coal bunkers are cleared safely and effectively, the safety of the pulverized coal bunkers is guaranteed, and spontaneous combustion or explosion of the pulverized coal in the pulverized coal bunkers are prevented. The system and method can work by just adding pipelines and corresponding valves, no additional energy-consuming equipment is needed, the system and method have the advantages of being simple and reliable in system and small in maintenance workload, combustion-supporting oil for burning out the pulverized coal bunkers when the boilers stop routinely can be saved, and the need to empty the pulverized coal bunkers when the boilers stop suddenly can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power generation, and in particular relates to a system and method for removing powder stored in a coal powder bin by using the negative pressure of an adjacent furnace. Background technique [0002] In the power plant boiler of the intermediate storage type pulverizing system, the hot air and raw coal entering the pulverizing system are dried in the pulverizer to form an air-powder mixture, which passes through the pulverizing pipeline under the suction of the negative pressure established by the pulverizing machine After entering the coarse and fine powder separator, the qualified coal powder is sent into the powder bin, and then through the powder feeder and air powder mixer, the coal powder is sent into the furnace for combustion under the conveying of hot air. The powder silo is an important equipment of this kind of pulverization system. Qualified coal powder is transferred and stored in ...

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Problems solved by technology

However, the existence of the powder silo also brings a lot of potential dangers and inconveniences to the mid-storage pulverizing system, because the pulverized coal in the powder silo has a large amount of energy. If the powder silo burns out, it is necessary to prolong the shutdown time of the boiler and waste a lot of fuel oil and electric energy. Especially in the state of unplanned emergency shutdown of the boiler, a large amount of stored powder in the powder silo has the risk of spontaneous combustion and explosion, which is a huge safety hazard.

The current powder conveying system between powder silos is mainly for mechanical transportation of coal powder before entering the powder silo, and the powder conveying system after entering the powder silo mainly uses positive pressure conveying. Low-level disadvantages, so the manual method is still widely used to remove the residual powder in the powder bin. The manual method not only wastes all the coal powder, but also seriously pollutes the environment; on the other hand, it also requires a lot of manpower and takes a long time to remove, which affects The maintenance work process has also formed an important safety hazard

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