Coke oven raw gas high temperature segment heat high efficient recovering device

Abstract

The invention relates to a coke oven raw gas high temperature segment heat high efficient recovering device. A vertical pipe sleeve pipe type quenching waste heat boiler is composed of a sleeve pipe type steam heat exchanger and a steam pocket. The air inlet in the top of the sleeve pipe type steam heat exchanger is connected to the air collection pipe in the top of a coke oven through a high temperature deduster. The water inlet of the steam pocket is connected to a desalting water tank though a low temperature heat exchanger, a boiler water pump, an oxygen remover, and a deoxidizing water pump in sequence. The steam outlet in the top of the steam pocket is connected to a low pressure steam user through a temperature reducing and pressure reducing device; or is connected to a high voltage generating user through a steam super-heater. The sewage outlet in the bottom of the sleeve pipe type steam heat exchanger is connected to a drain well through a periodic sewage discharge expander. The provided device can high efficiently recover the heat of the coke oven raw gas high temperature segment and generate high temperature high pressure saturated steam; thus high pressure overheated steam or low pressure saturated steam is produced, at the same time, condensation of polymers in equipment is reduced, the coking period is prolonged, the coke cleaning efficiency is improved, and the stable operation of the system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization of coke oven raw gas, in particular to a high-efficiency recovery device for heat in the high temperature section of coke oven raw gas. Background technique [0002] The temperature of the raw gas at the outlet of the coke oven carbonization chamber is about 650-750°C, which has high heat. Efficient recovery of this part of the heat is of great significance for coking enterprises to save energy and improve economic benefits. A key step for waste heat recovery efficiency of raw gas. At present, there are mainly three types of waste heat recovery processes for raw coke oven gas that have been disclosed: 1) Use the riser tube heat exchanger to recover the sensible heat of raw coal gas and produce 0.4-0.6MPa low-pressure saturated steam; 2) Import the raw coal gas after dedusting For waste heat boilers, after the temperature of the raw gas drops to 150°C, spray ammonia water to continu...

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Problems solved by technology

[0003] The above three process routes all have many deficiencies: the first process produces a single type of steam, the steam production is small, and it is easy to cause coking or even water leakage in the riser tube, which affects the operation of the coke oven; the second process is very easy to coke in the heat exchange tube, It leads to low heat exchange efficiency, and even pipe blockage and pipe bursting, which affect safety production; the third process recovers low heat grade, low thermal efficiency, large consumption of ammonia water, and large sewage discharge

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