Coal gangue grading and quality-grading pyrolysis decarburization and waste heat gradient utilization system and operation method

Abstract

The invention discloses a coal gangue grading and quality-grading pyrolysis decarburization and waste heat gradient utilization system and an operation method, and the coal gangue grading and quality-grading pyrolysis decarburization and waste heat gradient utilization system comprises a pyrolysis furnace used for inputting coal gangue and carrying out pyrolysis; an air preheater; the decarburization furnace is used for inputting preheated air; the combustion device is used for inputting pyrolyzed solid materials for combustion decarburization; the pyrolysis gas input device is used for inputting pyrolysis gas and combusting in the oil-gas combustor; the decarburization furnace is used for outputting decarburized ash and flue gas; a slag cooler; a waste heat boiler; heat-exchanged flue gas output by the waste heat boiler is used as a heat source for pyrolysis of the pyrolyzing furnace, and flue gas used after pyrolysis is used as a heat source for preheating of the air preheater. According to the invention, superior combustion conditions are ensured through graded and quality-divided utilization of pyrolysis oil gas and solid materials and gradient utilization of waste heat, and the technical problems of stable ignition and sufficient decarburization of large-scale direct combustion of full-grade coal gangue in the prior art can be solved.

Description

technical field [0001] The invention belongs to the technical field of large-scale consumption of coal gangue, relates to the field of coal gangue pyrolysis and decarbonization, and in particular relates to a system and an operation method for coal gangue grading and mass pyrolysis decarburization and waste heat cascade utilization. Background technique [0002] The coal-based organic industrial solid waste coal gangue produced in the process of raw coal mining and washing accounts for about 8% to 20% of the coal mining volume. Compared with raw coal, coal gangue has lower carbon content, lower calorific value and Due to its hard texture and other characteristics, the long-term accumulation of large amounts of coal gangue will occupy a large amount of farmland, waste land resources, cause natural disasters such as spontaneous combustion, dust, acid rain, soil erosion, etc., which will affect the stability of the ecosystem, and will also cause waste of energy and energy. [0...

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Problems solved by technology

[0006] (3) In the technology of preparing building materials from coal gangue, it is necessary to fully consider the characteristics of the material such as strength, wear resistance, penetration and frost resistance, and there are strict restrictions on the blending ratio of coal gangue, so it is difficult to realize large-scale disposal of coal gangue;

[0007] (4) In terms of the use of coal gangue for soil improvement and reclamation, due to the limitation of soil physical and chemical fluctuations in various regions and the risk of heavy metal seepage from coal gangue itself, the technical route needs to be further optimized and real-time detection should be done. Therefore, this technology is still The optimal solution for large-scale disposal of non-coal gangue;

[0008] (5) The use of coal gangue for power generation is a relatively mature way to consume coal gangue at present, but the coal gangue used for power generation has limitations on low-level calorific value and needs to be blended with fuel for energy supply, so it is impossible to achieve large-scale consumption of full-grade coal gangue accept

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