System and method for clearing pulverized coal storage powder by using adjacent furnace negative pressure

Abstract

The invention discloses a system and a method for removing the stored powder in a coal powder bin by utilizing the negative pressure of an adjacent furnace. Powder separator, fine powder separator, sawdust separator, powder silo, pulverized coal isolation valve, powder feeder, powder discharge pipe air volume adjustment valve, primary bellows, air powder mixer, powder discharge pipeline air volume and speed measurement The method can realize the effective transportation of pulverized coal between the two boiler powder bins, and after one of the units is shut down, the powder bins can be safely and effectively removed to ensure the safety of the powder bins. Prevent spontaneous combustion or explosion of pulverized coal in the powder silo. The invention only needs to add pipelines and corresponding valves, and does not need to add any energy-consuming equipment, and has the characteristics of simple and reliable system, low maintenance workload, etc., and can save the combustion-supporting oil for burning empty powder bins when the conventional furnace is shut down. It can also meet the needs of emptying the powder silo when the furnace is suddenly stopped.

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 ...

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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