A coke oven raw gas waste heat recovery process

Abstract

The invention discloses a waste heat recovery process of raw coke oven gas, which comprises the following steps: (1) 650-750°C raw gas enters a gas collecting pipe from an ascending channel and enters a high-temperature dust collector for preliminary dust removal, and hot gas enters from an upper channel of the high-temperature dust collector The casing-type quenching boiler, the smoke and dust are filtered; (2) The raw gas enters the casing-type steam heat exchanger in the casing-type quenching boiler to cool down, and after heat exchange, it flows out through the gas outlet; at the same time, the desalination and oxygen-removing boiler Water enters the jacketed steam heat exchanger from the water inlet of the gas-liquid separator for heat exchange, and through heat exchange, it becomes a steam-water mixture and flows into the gas-liquid separator for gas-liquid separation. Finally, the steam enters the steam pipe from the steam outlet. The present invention It can maximize the recovery of coke oven raw gas waste heat and save energy; it can produce high-grade steam, and the system is stable and reliable. The device can reduce polymer condensation and prolong the coking cycle.

Description

technical field [0001] The invention belongs to the technical field of coking, and in particular relates to a coke oven raw gas waste heat recovery process. Background technique [0002] In the process of coking production, raw coal gas is the gas decomposed from coal in the carbonization chamber due to carbonization. At present, it is mainly used to spray ammonia water for direct cooling, which wastes a lot of heat value. Some manufacturers have already recovered and utilized the waste heat of this section of raw gas. However, due to technical bottlenecks, there are few successful cases and the economic benefits are small. Currently, the waste heat of raw gas The difficulty of recycling is that raw coal gas contains coal tar and a large amount of fine coal powder, and it starts to condense at 500°C. The condensate is highly viscous and easily sticks to the inner wall of the heat exchange tube, which will reduce the heat exchange effect and cause blockage in a short period o...

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Problems solved by technology

[0002] In the process of coking production, raw gas is the gas decomposed by coal in the carbonization chamber due to carbonization. At present, it is mainly used to spray ammonia water for direct cooling, which wastes a lot of heat value. Some manufacturers have already recovered and utilized the waste heat of this section of raw gas. However, due to technical bottlenecks, there are few successful cases and little economic benefit. Currently, the waste heat of raw gas The difficulty of recycling is that raw coal gas contains coal tar and a large amount of fine coal powder, which starts to condense at 500°C. The condensate is high in viscosity and easily sticks to the inner wall of the heat exchange tube, which will reduce the heat exchange effect and cause blockage in a short period of time. tube, will directly affect the system operation

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