Water gas preparation process based on dry coke quenching and coking coal dehumidification

Abstract

The invention discloses a water gas preparation process based on dry coke quenching and coking coal dehumidification. The water gas preparation process includes: coking coal is crushed by a crusher and fed into a fluidized bed for fluidizing, drying and classifying so as to separate coarse coal particles and fine pulverized coal, the coarse coal particles are fed into a coke oven for coking to obtain red coke, the red coke is cooled by dry quenching furnace to obtain cooled coked, cooling gas in the dry quenching furnace is circulation coal gas, the circulation coal gas discharged by the dry quenching furnace enters a waste heat boiler so as to recycle part of sensible heat, the circulation coal gas is then fed into the fluidized bed to perform fluidizing and drying on the crushed coking coal, low-temperature waste heat is recycled, part of moisture and the fine pulverized coal are brought out at the same time, dust removing is performed on the circulation coal gas through a settling chamber or a cyclone dust remover, the circulation coal gas is then returned to the dry quenching furnace to coal the red coke, water-gas reaction is performed to generate water gas entering the circulation coal gas, and the water gas generated by the reaction serves as the byproduct residual coal gas to be fed to a coal gas purifying system. The water gas preparation process is simple, capable of effectively recycling the process low-temperature waste heat, capable of effectively drying the coking coal, capable of producing the byproduct coal gas and environmentally friendly.

Description

Technical field [0001] The invention relates to the field of coal chemical industry, in particular to a water gas preparation process based on dry quenching and coking coal dehumidification. Background technique [0002] Although the existing CDQ process has mature technology and reliable operation, the circulating cooling gas is nitrogen. As the cycle progresses, the negative pressure section of the system will inevitably inhale a certain amount of air, and the O in the air 2 When passing through the red coke layer of the CDQ, it will react with coke to generate CO and CO 2 ; Secondly, the water in the air reacts with red coke to form H 2 ; In addition, the red coke is further pyrolyzed in the pre-storage section of the CDQ to generate H 2 And CH 4 . Therefore, there will be H in the CDQ circulating gas 2 , CO, CH 4 And other combustible components. [0003] The content of combustible components in the circulating gas is determined by many factors. If the coke processing capacit...

AI Technical Summary

Problems solved by technology

The dry quenching process using water gas and coke oven gas as the circulating gas artificially adds water vapor, which consumes a lot of coke

The waste heat of cold coke leaving the CDQ furnace has not been effectively utilized

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