Novel pulverized coal boiler low-nitrogen combustion system

Abstract

The invention discloses a novel pulverized coal boiler low-nitrogen combustion system. The novel pulverized coal boiler low-nitrogen combustion system comprises a coal fine coal mill, an efficient low-nitrogen combustion device with wall attaching wind, a heating face with a catalyst spraying layer, a catalyst with CO catalytic oxidation effect, an online O2 measuring device, an online CO measuring device, an online NOx measuring device, an industrial control machine and the like. On the basis of coal fine low-nitrogen combustion theory combining air / fuel depth graded combustion low-temperature, low-oxygen and long staying time and full-hearth large-space low heat load section balance combustion, through large-hearth model selection design, the low-nitrogen combustion system with the wallattaching wind, economic coal fine fineness, powder making system coordination, wind smoke system cooperation and other new technilogy devices, in combination with ultra-fine coal fine, wind powder conveying precise control, depth air graded low-oxygen combustion process optimized regulation technology and hearth outlet CO catalytic oxidation technology, systematicness and full-process low-nitrogen combustion of the coal fine combustion are achieved, and finally boiler high-efficiency ultra-low NOx emission targets can be achieved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power generation, and in particular relates to a novel low-nitrogen combustion system of a pulverized coal boiler. Background technique [0002] The research and application of traditional low NOx combustion technology has developed and applied one after another. The first generation, second generation, and third generation low NOx combustion technology still have many shortcomings, and it is difficult to meet the current stringent air pollutant emission requirements of power plant boilers. Specifically, the operation mode of the first-generation combustion technology is adjusted or improved; the second-generation low-nitrogen combustion technology is based on air-staged combustion technology, including OFA measures and its deformation of the overall air classification in the furnace, and various low-NOx combustion technologies. However, there are limitations such as weak overall boiler system,...

AI Technical Summary

Problems solved by technology

[0002] The research and application of traditional low NOx combustion technology has developed and applied one after another. The first generation, second generation and third generation low NOx combustion technology still have many deficiencies, and it is difficult to meet the current stringent air pollutant emission requirements of power plant boilers.

Specifically, the operation mode of the first-generation combustion technology is adjusted or improved; the second-generation low-nitrogen combustion technology is based on air-staged combustion technology, including OFA measures and its deformation of the overall air classification in the furnace, and various low-NOx combustion technologies. However, there are limitations such as weak overall boiler system, single technology, insufficient boiler potential, sacrifice of boiler efficiency, and negative effects such as high-temperature corrosion of water-cooled walls; the third generation: re-combustion technology, the fuel delivery system becomes complicated, and at the same time due to the acquisition of The high cost of reburning fuel (natural gas or fines) limits the use of reburning technology

Therefore, the first three low-nitrogen combustion technologies are all limited to relatively single low-nitrogen combustion measures, and the range of reducing NOx emissions is limited, and there are many side effects

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