Coke oven gas afterheat recovering method and device

Abstract

The invention belongs to the field of afterheat recovering of coke oven gas, and in particular relates to a coke oven gas afterheat recovering method and a coke oven gas afterheat recovering device. Coke oven gas recovery and tar recovery are integrated, high-temperature heat energy and low-temperature heat energy in the gas are respectively recovered by using a segmental recovery mode; and the gas is cooled by using a mode of spraying tar during recovering. The device comprises a high-temperature afterheat boiler, an oil-gas separator, a gas cooler, an oil-water separator and a low-temperature afterheat boiler, wherein a gas inlet of the high-temperature afterheat boiler is connected with a gas outlet of a coke oven carbonization chamber raw coke oven gas; and a gas outlet of the oil-gas separator is connected with the gas cooler. Compared with the prior art, the method and the device have the advantages that high-temperature heat energy can be recovered and low-temperature heat energy also can be recovered in a segmental afterheat recovery mode that the high-temperature afterheat of the gas is recovered by the high-temperature afterheat boiler and the low-temperature afterheat is recovered by spraying the gas by using tar, so that the heat energy recovery rate is high, the double aims of energy conservation and improvement on economic benefit are fulfilled, and the phenomenon that an afterheat boiler is blocked by the tar and dust in the gas also can be avoided.

Description

technical field [0001] The invention belongs to the field of coke oven gas waste heat recovery, in particular to a coke oven gas waste heat recovery method and device. Background technique [0002] The 600-800°C raw coal gas from the coke oven carbonization chamber has high heat energy, and this energy should be recovered as much as possible to achieve the purpose of energy saving. The disclosed coke oven gas waste heat recovery process is as follows: a) The 600-800°C raw coal gas from the coke oven carbonization chamber is first dedusted and then the waste heat is recovered by the waste heat boiler. After the gas temperature drops to 150-400°C, The temperature of the ammonia sprayed gas is reduced to 70-90°C, and then it is cooled by the gas cooler and then sent to the subsequent process. b) The 600-800°C raw coal gas from the coke oven carbonization chamber is first sprayed with ammonia water to reduce the gas temperature to 70-90°C, and then the low-temperature waste hea...

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Problems solved by technology

[0003] Both of these two processes have relatively large defects. The first process has 600-800 ℃ raw coal gas, which is dust-removed first and then waste heat is recovered by the waste heat boiler.

In the second process, raw coal gas at 600-800°C is sprayed with ammonia water to lower the temperature of the gas to 70-90°C, and then the low-temperature waste heat is recovered in the gas cooler. All the recovery is low-temperature heat energy below 90°C, and the heat recovery rate is low.

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