富氧下煤粉掺烧生物质气的NO_x与CO₂生成量协同排放研究

Research on the Synergistic Emission of NO_x and CO₂ Generation from Pulverized Coal Blended Biomass Gas under Oxygen Enrich-ment

摘要: 在富氧条件下，煤粉掺烧生物质气既能实现低NO_x排放，也实现碳捕集从而达到减碳目的。本文以350 MW四角切圆锅炉为研究对象，通过数值模拟研究了富氧下燃煤锅炉掺烧生物质气过程中生物质气掺烧比对NO_x与CO₂的协同排放控制规律。结果表明：掺烧生物质气不影响燃煤锅炉的燃烧过程；随着掺烧生物质气比例的增大，炉膛出口的NO_x与CO₂体积分数有负向协同排放的趋势；当生物质掺烧比例为20%时，炉膛出口的NO_x体积分数为396 ppm，CO₂体积分数为80.9%，生物质能的利用、CO₂捕集及NO_x污染物排放控制均能达到很好的协调。本文研究成果将对火力发电行业实现低氮燃烧和碳减排提供技术理论支撑。

Abstract: In oxygen-enriched conditions, pulverized coal blended with biomass gas can achieve both low NO_x emissions and carbon capture to achieve carbon reduction. In this paper, we studied the synergistic emission control law of NO_x and CO₂ in the process of biomass gas blending in a coal-fired boiler un-der oxygen-enriched conditions by numerical simulation using a 350 MW quadrangular cut-round boiler as the research object. The results show that the doping of biomass gas does not affect the combustion process of coal-fired boiler; with the increase of the doping ratio of biomass gas, the NO_x and CO₂ volume fraction at the furnace outlet has a negative trend of synergistic emission; when the doping ratio of biomass is 20%, the NO_x volume fraction at the furnace outlet is 396 ppm and the CO₂ volume fraction is 80.9%, and the utilization of biomass energy, CO₂ capture and NO_x emission control can be well coordinated. The research results of this paper will provide technical and theo-retical support for the thermal power industry to achieve low nitrogen combustion and carbon emission reduction.