煤粉和生物质气混燃锅炉燃烧特性数值模拟研究
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摘要
为了研究煤粉与生物质气混燃对锅炉燃烧特性以及燃烧产物的影响,基于Aspen软件搭建了生物质气化模型,得到气化效率最高时的生物质气;基于Fluent软件搭建生物质气与煤粉的混合燃烧模型,在保证锅炉总输入热不变的情况下,分析煤粉锅炉掺烧10%不同的生物质气的锅炉炉膛温度分布和主要的烟气组分。结果表明:在分别掺烧10%的松木气、秸秆气和木屑气后相对于纯煤粉燃烧,炉膛燃烧区温度由1 843 K下降到1 789 K,炉膛出口烟温增大,O_2和CO出口体积分数增大,CO_2出口体积分数降低,NO_x出口质量浓度值由原来的548 mg/Nm~3降到500 mg/Nm~3以下。
In order to explore the influence of co-firing pulverized coal and biomass gas on the combustion characteristics and combustion products,the gasification model was established based on Aspen plus to obtain the biomass gas with maximum gasification efficiency. The co-firing model was then established in Fluent to analyze the boiler furnace temperature distribution and mean flue gas components of co-firing pulverized coal with 10% different biomass gases,under constant total input heat into the boiler. The results showed that compared to pure pulverized coal combustion,co-firing 10% pine gas,straw gas and sawdust gas,respectively,the temperature of the furnace combustion temperature decreases from 1 843 K to 1 789 K,and the furnace outlet temperature increases. The O_2 and CO volume fraction increase,while the CO_2 volume fraction decreases. The NO_x value at the furnace outlet reduces from 548 mg/Nm~3 to 500 mg/Nm~3.
In order to explore the influence of co-firing pulverized coal and biomass gas on the combustion characteristics and combustion products,the gasification model was established based on Aspen plus to obtain the biomass gas with maximum gasification efficiency. The co-firing model was then established in Fluent to analyze the boiler furnace temperature distribution and mean flue gas components of co-firing pulverized coal with 10% different biomass gases,under constant total input heat into the boiler. The results showed that compared to pure pulverized coal combustion,co-firing 10% pine gas,straw gas and sawdust gas,respectively,the temperature of the furnace combustion temperature decreases from 1 843 K to 1 789 K,and the furnace outlet temperature increases. The O_2 and CO volume fraction increase,while the CO_2 volume fraction decreases. The NO_x value at the furnace outlet reduces from 548 mg/Nm~3 to 500 mg/Nm~3.
引文
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[15]杨睿.四角切圆煤粉炉生物质气与煤粉混燃数值模拟[D].华北电力大学,2008.YANG Rui.Numerical simulation of the gasification based biomass co-firing in tangentially fired pulverized coal boiler[D].North China Electric Power University,2008.
[2]王泉海,唐秀能,张现晨,等.流化床中煤与木屑混烧污染物排放实验研究[J].工程热物理学报,2014,03:618-621.WANG Quan-hai,TANG Xiu-neng,ZHANG Xian-chen,et al.Experimental study on characteristics of pollutant emissions from cocombustion of sawdust and coal in circulating fluidized bed[J].Journal of Engineering Thermophysics,2014,03:618-621.
[3]张赵青,王智,赵瑞娥.生物质混煤燃烧中NOx排放的影响因素分析[J].能源与节能,2013,11:49-51.ZHANG Zhao-qing,WANG Zhi,ZHAO Rui-e.Analysis of influencing factors of NOxemissions in biomass mixed coal combustion[J].Energy and Energy Conservation,2013,11:49-51.
[4]王春波,王金星,雷鸣.恒温下煤粉与生物质混燃特性判定方法研究[J].太阳能学报,2014,10:1836-1841.WANG Chun-bo,WANG Jin-xing,LEI Ming.Judgment method to co-combustion characteristics of pulverized coal and biomass blends at constant temperature[J].Acta Energiae Solaris Sinica,2014,10:1836-1841.
[5]张建良,李净,胡正文,等.生物质与无烟煤混合燃烧行为的热重分析[J].太阳能学报,2013,10:1847-1852.ZHANG Jian-liang,LI Jing,HU Zheng-wen,et al.Thermogravimetric analysis of co-combustion behaviors of biomass and anthracite[J].Acta Energiae Solaris Sinica,2013,10:1847-1852.
[6]田红,廖正祝.农业生物质稻草与烟煤混烧特性及动力学分析[J].热力发电,2014,08:52-59.TIAN Hong,LIAO Zheng-zhu.Co-combustion of biomass straw and bituminous coal:characteristics and kinetics study[J].Thermal Power Generation,2014,08:52-59.
[7]DONG Chang-qing,YANG Yong-ping,YANG Rui,et al.Numerical modeling of the gasification based biomass co-firing in a 600 MW pulverized coal boiler[J].Applied Energy,87(2010)2834-2838.
[8]张宏伟,王波,袁益超,等.900 MW超临界锅炉混煤燃烧的数值模拟[J].锅炉技术,2014,45(6):47-52.ZHANG Hong-wei,WANG Bo,YUAN Yi-chao,et al.Numerical simulation of co-combustion of blended coal in a 900 MW supercritical boiler[J].Boiler Technology,2014011:47-52.
[9]刘志,雷秀坚,汪佩宁,等.循环流化床锅炉生物质与煤混烧积灰腐蚀试验[J].热力发电,2015,07:50-54.LIU Zhi,LEI Xiu-jian,WANG Pei-ning,et al.Experimental study on ash deposition and corrosion in a CFB boiler co-firing biomass with coal[J].Thermal Power Generation,2015,07:50-54.
[10]徐金苗,吕子安,吴玉新,等.生物质混燃技术在煤粉炉上存在的潜在风险[J].锅炉技术,2013,04:69-75.XU Jin-miao,LV Zian,WU Yu-xin,et al.The potential of biomass co-firing on pulverized coal boiler[J].Boiler Technology,2013,04:69-75.
[11]孙俊威,阎维平,赵文娟,等.600 MW超临界燃煤锅炉生物质气体再燃的数值研究[J].动力工程学报,2012,02:89-95.SUN Jun-wei,YAN Wei-ping,ZHAO Wen-juan,et al.Numerical study on biomass gas reburning in a 600 MW supercritical coal fired boiler[J].Journal of Chinese Society of Power Engineering,2012,02:89-95.
[12]李伟,王金星,黄江城,等.300 MW煤粉/高炉煤气混燃锅炉NOx优化数值模拟[J].电力科学与工程,2012,07:55-60.LI Wei,WANG Jin-xing,HUANG Jiang-cheng,et al.Numerical simulation of 300 MW blast furnace gas and pulverized coal blended combustion boiler on the optimizing of NOx[J].Electric Power Science and Engineering,2012,07:55-60.
[13]湛志钢,陈刚.煤粉锅炉掺烧高炉煤气对煤粉燃尽影响的研究[J].动力工程,2004,02:179-182.ZHAN Zhi-gang,CHEN Gang.Influence of adding blast furnace gas to pulverized coal combustion boiler on coal complete combustion[J].Power Engineering,2004,02:179-182.
[14]方立军,武生,王铁民.高炉煤气/煤粉混烧锅炉燃尽风优化数值模拟[J].华北电力大学学报,2014,01:96-100.FANG Li-jun,WU Sheng,WANG Tie-min.Numerical simulation of overfire air optimization for blast furnace gas/pulverized coal combined combustion boiler[J].Joumal of North China Electric Power University,2014,01:96-100.
[15]杨睿.四角切圆煤粉炉生物质气与煤粉混燃数值模拟[D].华北电力大学,2008.YANG Rui.Numerical simulation of the gasification based biomass co-firing in tangentially fired pulverized coal boiler[D].North China Electric Power University,2008.