孙锦余,刘晓伟,戴高峰,赵小军,郑仕杰,薛东发,RAHMAN Ur Zia,王学斌
SUN Jinyu,LIU Xiaowei,DAI Gaofeng,ZHAO Xiaojun,ZHENG Shijie,XUE Dongfa,RAHMAN Ur Zia,WANG Xuebin

• 1:南电能源综合利用有限公司
• 2:西安交通大学能源与动力工程学院
• 3:中广核研究院有限公司

摘要(Abstract)：

生物质是零碳可再生能源，对我国实现碳达峰、碳中和目标具有重要意义。虽然被视为清洁能源，但生物质燃烧过程仍会排放NO_x(NO、N_2O)和温室气体(CH_4、N_2O、CO_2),有必要对生物质直燃的NO_x和温室气体排放特性进行研究。测量某15 MW生物质循环流化床的NO_x和温室气体排放，并探究了改变床压、一二次风比、前后墙二次风比、废木料掺烧比例等因素对NO_x和温室气体排放特性的影响。燃烧调整试验表明：升高床压有利于降低NO排放，但降幅很小，且会造成CO和CH_4体积分数上升，CO_2体积分数降低；随一二次风比增大，NO排放略降低，这意味着可适当降低二次风以降低NO排放量，CO和CH_4体积分数降低，CO_2体积分数升高；当前墙二次风开度/后墙二次风开度较小或较大时，均有利于降低NO,CO和CH_4排放量也较低；高含氮废木料掺烧比例由20%增至50%时，NO和CO_2排放量先升高后降低，CO和CH_4排放量先降低后升高。研究表明当前生物质循环流化床锅炉采用低过量空气系数控制NO_x排放时，CO和CH_4排放浓度显著提高，一方面降低了燃烧效率，另一方面CH_4作为温室气体排放也需引起关注；炉内燃烧调整手段对NO_x降低有限，高含氮燃料在不完全燃烧的情况下还会生成NH_3和HCN。
Biomass is a "zero carbon" renewable energy source and is of great importance to China in achieving the goal of "peak carbon emission and achieve carbon neutrality". Although it is considered as a clean energy source, biomass combustion still emits NO_x(NO, N_2O) and greenhouse gases(CH_4, N_2O, CO_2). Therefore, it is necessary to investigate the NO_x and greenhouse gas emissions characteristics of direct biomass combustion. NO_x and greenhouse gas emissions from a 15 MW biomass circulating fluidized bed were measured, and the effects of bed pressure, primary and secondary air ratio, front and back wall secondary air ratio, waste wood blending ratio on NO_x and greenhouse gas emission characteristics were investigated. The combustion adjustment experiments show that the increase in bed pressure is beneficial to reduce NO and CO_2 emissions, but the reduction is small and causes an increase in the volume fraction of CO and CH_4, and a decrease in CO_2 volume fraction. With an increase in the primary to secondary air ratio, NO emissions are slightly reduced with a low CO and CH_4 emission, which means that the secondary air can be reduced appropriately to reduce NO emissions. When the ratio of secondary air from front and back walls is small or large, it is beneficial to reduce NO with a low CO and CH_4 emission. When the mixing ratio of waste wood with high content of N is increased from 20% to 50%, NO and CO_2 emissions first emissions increases and then decreases, while the CO and CH_4 show a reverse trend. This study shows that when low excess air co-efficient combustion method is employed to control NO_x emissions of the biomass circulating fluidized bed boiler, the concentration of CO and CH_4 emission is significantly increased, which reduces combustion efficiency. In addition, as a greenhouse gas emission, CH_4 must be considered. Combustion adjustments method is not sufficient enough to control NO_x, while high amount of NH_3 and HCN are emitted when some certain high nitrogen-containing fuels are burned with low oxygen combustion.

关键词(KeyWords)： 生物质;循环流化床;NO;N_2O;温室气体
biomass;CFB;NO;N_2O;greenhouse gas

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划政府间国际科技创新合作资助项目(丹麦)(2021YFE0107300)

作者(Author): 孙锦余,刘晓伟,戴高峰,赵小军,郑仕杰,薛东发,RAHMAN Ur Zia,王学斌
SUN Jinyu,LIU Xiaowei,DAI Gaofeng,ZHAO Xiaojun,ZHENG Shijie,XUE Dongfa,RAHMAN Ur Zia,WANG Xuebin

DOI: 10.13226/j.issn.1006-6772.SG22080901

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