Coal gangue pyrolysis gasification raw coal gas purification combustion heat exhaust gas activated coke regeneration method

Abstract

The invention discloses a method for active coke regeneration through hot exhaust gas obtained by purification and combustion of coke oven raw gas in 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; and (4) purifying and combusting the exported coke oven raw gas, and evaporating purification adsorbed saturated active coke by the combusted hot exhaust gas to regenerate unsaturated active coke. According to the method provided in the invention, afterheat of the hot exhaust gas generated by purification and combustion of recycled coke oven raw gas in coal gangue pyrolysis gasification is employed to evaporate saturated active coke for regeneration, no extra energy consumption is needed, heating equipment is saved, and the economic value of cyclic utilization can be obtained.

Description

technical field [0001] The invention relates to coal gangue pyrolysis gasification technology, in particular to a coal gangue pyrolysis gasification raw coal gas purification combustion heat waste gas active coke regeneration 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 produ...

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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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