Method for directly using red coke obtained by high-temperature pyrolysis of pulverized coal

Abstract

The invention relates to a method for directly using red coke obtained by high-temperature pyrolysis of pulverized coal. The red coke, which is a product obtained by high-temperature pyrolysis of pulverized bituminous coal and lignite, is directly used as a clean cohesionless power fuel or a gasifying raw material at a starting temperature of 600 DEG C-900 DEG C and is respectively applied in a red coke combustion boiler and a red coke gasifying furnace for carrying out thermoelectric and gasification production processes. By the method, the domestic excess coking production capacity can be fully utilized and vitalized, the problems of irreversible heat loss and utilization of low-grade low-rank pulverized coal in the current conventional combustion of coal at home and abroad are solved, the purposes that the thermal efficiency of the power fuel is substantially increased and the carbon element in the gasifying raw material is efficiently utilized are achieved, the environmental pollution caused by water-quenching coke during the pyrolysis and upgrading of pulverized coal is avoided, multiple fields of power and chemical industry (smelting) are coordinated and taken into account, the coal-based polygeneration production process is further optimized, the entire system achieves the effect of rational use of energy and the method is in full compliance with the national requirements of the clean utilization of coal.

Description

technical field [0001] The invention relates to a method for directly using pulverized coal at high temperature to pyrolyze red coke, especially a process that can make full use of low-quality and low-order pulverized coal at high temperature to pyrolyze red coke to directly produce steam, generate electricity and gasify. The core of the cogeneration process, through the integration of domestic excess coking capacity, optimization of industrial coal-fired boilers, power plant coal-fired boilers, coal gasification for power generation, production of chemical products and smelting reduction, can be coupled into a coal chemical multi-generation comprehensive park, which belongs to the energy industry Comprehensive utilization of technical fields. technical background [0002] According to statistics, by the end of 2009, there were 595,200 boilers in China, including 584,800 industrial boilers; the annual coal consumption of boilers was about 2.15 billion tons, of which about 1....

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Problems solved by technology

[0003] In 2013, the total output of coke in my country reached 476 million tons, and the production capacity was about 650 million tons. The production capacity of independent coking enterprises was seriously overcapacitated, and the coking industry fell into a state of loss in the whole industry. For a long period of time, the overall operation of the coking industry is difficult to improve

[0007] The prior art disclosed above is an improvement on the existing red coke CDQ technology in coking production, and the coke products produced are also metallurgical coke, which requires a certain degree of lumpiness and strength, and is used for blast furnace ironmaking. The sensible heat of red coke is generated by indirect heat exchange to generate steam for power generation. There is no report on high-temperature pyrolysis of pulverized coal with sensible heat for direct combustion and gasification.

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