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

A technology for pulverized coal bunkers and adjacent furnaces, which is applied in the direction of combustion methods, fuel supply adjustment, block/powder supply/distribution, etc., which can solve the problems of affecting the maintenance work process, prolonging the shutdown time of the boiler, and long consumption , to achieve the effect of saving time, manpower and material resources, benefiting environmental protection and energy saving of the boiler, and shortening the preparation time for shutdown

Active Publication Date: 2015-05-20
XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] see figure 1 , the present invention utilizes the negative pressure of the adjacent furnace to remove the powder stored in the pulverized coal bin, which specifically includes a boiler A 1 and its first burner 2, the first powder row fan 3, the first coal mill 4, the first raw coal hopper 5, The first coarse powder separator 6, the first fine powder separator 7, the first sawdust separator 8, the first powder bin 9, the first pulverized coal isolation valve 10 of the powder discharge pipe, the first powder feeder 11, the first discharge Powder pipe cold air regulating valve 12, first primary wind box 13, first air powder mixer 14, first coal feeder 15, first powder discharge pipe wind speed measuring device 16, and first powder discharge pipe adjacent furnace isolation valve 17; It also includes the second burner 19 of boiler second 18 and boiler seco...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K3/02F23N1/02
Inventor 周虹光汪华剑闵宏斌严响林白鹏房凡张朋飞张伟
Owner XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD
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