System and method for preventing raw coal oxidation and spontaneous combustion by pumping low-temperature furnace smoke inerting spherical coal bunker

Abstract

The invention discloses a system and a method for preventing spontaneous combustion by oxidization of raw coal in a spherical bunker by drawing low-temperature flue gas into the bunker for inerting. The system comprises a tail flue heat exchanger, a dust remover, an induced draft fan, a desulfurizing tower, a chimney, a low-temperature flue gas fan, a flue gas preprocessor, flue gas nozzles, an automatic steam trap, a condensate pool, a condensate pump and pipeline valves, wherein flue gas of a boiler passes through the tail flue heat exchanger and then enters the dust remover for dedusting, the dedusted flue gas enters the desulfurizing tower after passing through the induced draft fan, low-temperature flue gas at an outlet of the desulfurizing tower is divided into two paths, and one path of flue gas is discharged into the atmosphere through the chimney while the other path of flue gas is pressurized by the low-temperature flue gas fan, then cooled and dehumidified by the flue gas preprocessor and finally fed into the flue gas nozzles through a pipeline to be sprayed into the spherical bunker. Inert components of flue gas enable a pile of raw coal in the spherical bunker to be separated from oxygen in air, thereby preventing spontaneous combustion caused by oxidization of the raw coal.

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 preventing raw coal from oxidation and spontaneous combustion by extracting low-temperature furnace smoke and inerting a spherical coal bunker. 【Background technique】 [0002] Spherical coal bunker is a kind of storage equipment for storing raw coal. It has the advantages of less coal lifting, beautiful appearance, large coal storage capacity, and less land occupation. Therefore, it has an important application prospect in coal storage in power plants. Due to the relatively closed space of the spherical coal bunker, the heat dissipation conditions in the coal bunker are poor. When coal with high volatile content such as bituminous coal is stored in the coal bunker, the coal stored in the coal bunker is prone to oxidative spontaneous combustion, which seriously damages the coal. The safety of storage and withdrawal equipmen...

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Problems solved by technology

Due to the relatively closed space of the spherical coal bunker, the heat dissipation conditions in the coal bunker are poor. When coal with high volatile content such as bituminous coal is stored in the coal bunker, the coal stored in the coal bunker is prone to oxidative spontaneous combustion, which seriously damages the coal. The safety of storage and withdrawal equipment such as warehouses also causes the heat loss of raw coal, which affects the economics of coal storage.

Although there is N in the existing spherical coal bunker 2 Fire extinguishing system and other fire-fighting systems, but due to the large space of the coal bunker and the existing use of bottled steam sources such as liquid nitrogen, the existing fire-fighting system cannot meet the needs of inerting and preventing spontaneous combustion in the coal bunker under continuous operation conditions, and it is urgent to develop a According to the characteristics of the existing resources of the power plant, the inert furnace smoke easily obtained by the power plant is used as the inert protection gas of the raw coal to prevent the oxidation and spontaneous combustion of the raw coal, so as to protect the safe operation of the coal bunker and prevent the heat loss of the raw coal

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