Coke oven raw gas ammonia injection cooling system and cooling method

Abstract

A coke oven raw gas ammonia injection cooling system and cooling method, the ammonia injection cooling system includes: a detection module, including a thermocouple and a pressure transmitter installed at the flue gas inlet of the bridge tube, the thermocouple is used to detect the temperature of the bridge tube The raw gas temperature at the flue gas inlet, the pressure transmitter is used to detect the raw gas pressure at the flue gas inlet of the bridge pipe, the thermocouple and the pressure transmitter are connected with the control module, and the detected raw gas temperature and flow data are sent to The control module; the execution module, including the ammonia water nozzle installed at the flue gas inlet of the bridge pipe, the ammonia water pipeline connected with the ammonia water nozzle, the regulating valve and the frequency conversion water pump, and the control valve and the frequency conversion water pump are connected with the control module; the control module, according to the focus The raw gas temperature and flow data in a coking cycle on the furnace adjust the frequency conversion water pump and the regulating valve, so that the flow of ammonia water is supplied in a step-down manner, and the flow rate of each step is kept constant. The invention adopts ammonia water to spray in stages, reduces the amount of ammonia water, reduces power consumption, and reduces operating costs.

Description

technical field [0001] The invention belongs to the technical field of coking, and in particular relates to a coke oven raw gas ammonia injection cooling system and a cooling method. Background technique [0002] In the coking production process, a large amount of high-temperature raw coal gas will be produced. In order to obtain coke oven gas in the later stage, it is first necessary to cool down the high-temperature raw coal gas. The current technical method of cooling raw gas is usually: spray a large amount of circulating ammonia water at the coke oven bridge pipe to directly contact the raw gas, and rely on the vaporization of excess circulating ammonia water to reduce the temperature of the raw gas to 80 ° C. During the entire coking cycle, ammonia water is sprayed The flow rate of , usually stays the same. However, during the coking process, the temperature and flow rate of the raw gas coming out of the coke oven are not constant, but fluctuate with the coking time. ...

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Problems solved by technology

[0006] In order to solve the above problems, the present invention discloses a coke oven raw gas ammonia injection cooling system and cooling method, which can greatly reduce the waste caused by excessive ammonia water spraying, reduce the power consumption of the ammonia water circulation pump and the tar separation device workload and wastewater treatment volume

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