Export condensation and recovery purification method for coke oven raw gas of coal gangue pyrolysis gasification

Abstract

The invention discloses an export condensation and recovery purification method for the coke oven raw gas of coal gangue pyrolysis gasification. The method includes the steps of: (1) providing a heat source for coal gangue pyrolysis gasification by heat storage and exchange and alternate combustion of purified coal gas; (2) letting carbon in a coal gangue pyrolysis solid product encounter superheated steam to undergo a water gas reaction so as to generate water gas; (3) exporting coke oven raw gas; (4) spraying ammonia water on the exported coke oven raw gas to lower the temperature so as to form a mixed solution of coal tar and ammonia water; (5) subjecting the mixed solution of coal tar and ammonia water to precipitation separation; (6) leaving the cooled coke oven raw gas to active coke adsorption, applying the adsorbed clean gas to storage or combustion, and subjecting saturated active coke to evaporation regeneration; and (7) fractionating evaporation regenerated light oil, crude benzene, a three-oil mixture, anthracene oil and other ingredients. The method provided in the invention recovers and purifies the coke oven raw gas in coal gangue pyrolysis gasification, realizes extraction and utilization of carbon, oil, gas and other substances in the coke oven raw gas, and has good economic value.

Description

technical field [0001] The invention relates to coal gangue pyrolysis gasification technology, in particular to coal gangue pyrolysis gasification raw coal gas export condensation and recycling purification method. Background technique [0002] Coal gangue - the stone selected from raw coal is the waste residue of coal preparation plants, which is not easy to deal with. In China, hundreds of millions of tons of coal gangue cannot be used every year, and it still continues to discharge about 100Mt every year. It not only accumulates and occupies land, but also It can spontaneously combust and pollute the air or cause a fire, causing serious environmental pollution. [0003] Due to coalification for hundreds of millions of years, coal gangue contains 20-30% of carbon, oil, and gas substances, of which oil and gas account for 11-15%, and carbon accounts for 7-15%. Pyrolysis and gasification of coal gangue to obtain oil and gas products and 70-80% solid products (components are...

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Problems solved by technology

[0002] Coal gangue - the stone selected from raw coal is the waste residue of coal preparation plants, which is not easy to deal with. In China, hundreds of millions of tons of coal gangue cannot be used every year, and it still continues to discharge about 100Mt every year. It not only accumulates and occupies land, but also It can spontaneously combust to pollute the air or cause a fire, causing serious environmental pollution

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