Device for NOx reduction and grate firing by stokehold screening, gasifying and reburning

Abstract

A device for NOx reducing and grate firing by stokehold screening, gasifying and reburning belongs to the technical field of environment-friendly equipment and aims to realize the low NOx discharge amount and high efficiency burning of a grate firing industrial boiler. A stokehold screening and sorting device comprises a large-particle coal hopper, a medium-particle coal hopper and a small-particle coal hopper, wherein the medium-particle coal hopper is arranged between the large-particle coal hopper and the small-particle coal hopper, material inlet cavities of the large-particle coal hopper, the medium-particle coal hopper and the small-particle coal hopper are communicated with each other, a large-mesh screen is arranged in the large-particle coal hopper, a medium-mesh screen is arranged in the medium-particle coal hopper, the small-mesh screen is arranged in the small-particle coal hopper, a fire coal conveyer device is communicated with the small-particle coal hopper, the small-particle coal hopper and the medium-particle coal hopper are communicated with a spiral material conveyer which is communicated with a boiler coal hopper, the boiler coal hopper is communicated with a boiler, the large-particle coal hopper is communicated with a fixed bed gasification furnace, a gasifying gas outlet of the fixed bed gasification furnace is communicated with a gasifying gas spray nozzle by a fan and a gasifying gas pipeline, combustion air pipeline is communicated with the gasifying gas spray nozzle which is arranged in the boiler. The device is matched with the boiler for use.

Description

technical field [0001] The invention relates to equipment for reducing NOx layer combustion, which belongs to the technical field of environmental protection equipment. Background technique [0002] There are about 546,000 coal-fired industrial boilers in service in my country, accounting for 85% of the total number of industrial boilers currently in service, and increasing at a rate of about 1.5% every year. The annual coal consumption of coal-fired industrial boilers is 500-600 million tons, accounting for about 18% of the country's total annual coal consumption. The annual total energy consumption and pollution discharge of industrial boilers both rank second in the national industrial industry. [0003] In the research on the emission reduction of industrial boiler pollutants, SO 2 The research on smoke and dust was carried out relatively early, and a lot of research results have been obtained, and they have been applied industrially. Due to the low-temperature combus...

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Problems solved by technology

Therefore, the NOx emission reduction work of industrial boilers has not received sufficient attention (the NOx emission of industrial boilers is less than that of power station pulverized coal boilers, so the current attention is not enough and it is not applicable to reduce NOx emissions of existing power station pulverized coal boilers technology)

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