Coal-powder boiler oxygen-enriched combustion smoke near-zero emission and power generation system

Abstract

The invention provides a coal-powder boiler oxygen-enriched combustion smoke near-zero emission and power generation system. The system is composed of a boiler, a burner, an air separation device, a powder production system, a multi-stage heat exchanger, a multi-stage deduster, a recirculation draught fan, an induced fan, a dewatering device, an SO2 separation device, a CO2 capture device, an N2 separator, an NOx reaction device and the like. It is ensured that coal powder of different coal types is ignited in time, burns stably and burns out by changing the oxygen concentration of primary air and secondary air and the total oxygen amount, the efficiency of the boiler is improved, and the adaptability of the boiler to loads and coal types is enhanced. Dust, vapor, SO2, NOx, CO2 and the like caused by combustion smoke of coal powder are recycled through all the devices, so that harmful gas, fine particles and microelements in smoke are integrally removed. Meanwhile, the smoke exhaust temperature is reduced to be close to the atmospheric temperature, so that near-zero emission of smoke is achieved, environment protection is achieved, and resource utilization is maximized.

Description

technical field [0001] The invention relates to a coal-fired boiler technology for a power station, in particular to an oxygen-enriched combustion near-zero-emission power generation technology for a pulverized coal boiler. Background technique [0002] With the development of human industry, the environment and climate change issues have become the concerns of the whole world. The flue gas produced by the combustion of fossil fuels in the power station industry brings a large amount of dust, sulfide, nitrogen oxides and a large amount of carbon dioxide. The combustion products produced by the combustion of fossil fuels have a huge adverse impact on the environment and climate. However, the power station industry, which uses fossil fuels as raw materials, occupies an important position in the use of fossil fuels, and has also become a relatively concentrated source of carbon dioxide and other pollutant emissions, with huge emissions. Therefore, the control and treatment of ...

AI Technical Summary

Problems solved by technology

However, these measures for the emission of fossil fuel combustion products are not well combined. They are all independently considered to remove them, and chemical raw materials such as sulfides and nitrogen oxides are not recycled, which increases operating costs and a waste of resources

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