基于一次风精细配风的生物质炉排炉燃烧数值模拟  

Numerical Simulation Research on Combustion of Biomass-fired Grate Boiler Based on Refined Primary Air Distribution

作　　者：苏现强 马仑[1] 方庆艳[1] 杨顺志 朱建军 李忠杰 张雁茹 毛睿 SU Xianqiang;MA Lun;FANG Qingyan;YANG Shunzhi;ZHU Jianjun;LI Zhongjie;ZHANG Yanru;MAO Rui(State Key Laboratory of Coal Combustion(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China;State Energy Xunxian Biological Generation Co.,Ltd.,Hebi 458000,Henan Province,China;State Energy Biological Power Generation Group Co.,Ltd.,Chaoyang District,Beijing 100600,China;Rundian Energy Science and Technology Co.,Ltd.,Zhengzhou 450052,Henan Province,China)

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北省武汉市430074 [2]国能浚县生物发电有限公司,河南省鹤壁市458000 [3]国能生物发电集团有限公司,北京市朝阳区100600 [4]润电能源科学技术有限公司,河南省郑州市450052

出　　处：《中国电机工程学报》2024年第10期3975-3986,I0019,共13页Proceedings of the CSEE

基　　金：国家重点研发计划政府间国际科技创新合作项目(2021YFE0107300);中央高校基本科研业务费专项资金项目(YCJJ202203009).

摘　　要：生物质炉排炉内一次风沿炉排长度方向的配风方式会显著影响其燃烧特性,但目前未见相关报道。该文以某130t/h的秸秆直燃炉排炉为研究对象,探究一次风配风方式对炉内燃烧和污染物生成等关键参数的影响。开展一次风均匀(基准)、分段和精细分段配风下,炉排和炉膛气固两相燃烧的耦合数值模拟。结果表明:1)基准工况的模拟值与现场实测的炉内温度和出口NO等相对误差均在10%以内;2)与均匀配风相比,分段和精细分段配风提高了挥发分和焦炭燃烧段的氧气含量,促使更多的可燃物在固相燃烧,焦炭燃尽率由76.5%升至87.8%和95.5%;相应的从床层逸出到气相的可燃气体减少,使炉膛内烟气温度峰值降低且分布更加均匀;3)后两个工况中避免了炉内出现局部高温、富氧区域,NOx的形成受到抑制,出口NO由172mg/m^(3)(11%O_(2))降至161mg/m^(3)和156mg/m^(3)。综上,沿炉排长度进行一次风的分段或精细分段配风,可明显改善生物质的燃尽和污染物生成特性。The distribution of the primary air(PA)along the grate length plays a vital role in the combustion characteristics of the biomass-fired grate boiler,but there is no relevant report at current stage.In this paper,the biomass-fired grate boiler with an evaporation capacity of 130 t/h is selected,and the uniform(baseline),staged and refined-staged PA distribution cases are numerically simulated to comprehensively investigate the combustion and pollutants formation performance when the different PA distribution cases are conducted.The results show that:1)The relative errors between the simulations of the baseline and the several measured results of the field are all within 10%.2)Compared with the baseline,the oxygen content is increased during the volatile and char combustion process of the staged and refined-staged cases,promoting the burnout of the two matters.As the result,the char burnout ratio of the latter two cases remarkably increases from 76.5%to 87.8%and 95.5%,respectively.Correspondingly,the amount of the combustibles released from the solid phase to the freeboard is reduced,resulting in lower flue gas temperature peak and more uniform temperature distribution.3)The local high temperature and oxygen-rich regions are avoided in the latter two cases,which is beneficial to suppress the formation of NOx,thereby reducing the NO concentration at the outlet decreases from 172mg/m^(3)(11%O_(2))to 161 mg/m^(3)and 156 mg/m^(3),respectively.In summary,implementing staged or refined-staged primary air distribution along the grate length significantly improves combustion and pollutant generation characteristics of biomass.

关 键 词：生物质炉排炉 一次风配风方式 数值模拟 燃烧 污染物 

分 类 号：TK6[动力工程及工程热物理—生物能]