生物质气与煤混燃锅炉燃烧性能模拟研究
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摘要
为了分析生物质气与煤混合燃烧对锅炉燃烧过程以及运行性能的影响,基于Aspen Plus建立了生物质气化以及合成气与煤混合燃烧模型,对不同煤种与含水率为20%的松木气化合成气的混燃过程以及燃烧产物排放特性进行研究,得到了在不同生物质气掺烧比例下的锅炉最高燃烧温度、排烟体积、排烟温度、锅炉效率以及燃烧产物的变化规律。结果表明:在锅炉输入总热量不变的情况下,随着生物质气掺烧比例由0%增加到30%,混烧后的最高燃烧温度随着煤种质量的降低而降低,但排烟温度逐渐增大;烟气飞灰减少,机械未完全燃烧热损失减小,导致锅炉效率逐渐增加。
In order to analyze the influence of co-combustion of biomass gas and coal on combustion process and operation performance of the boiler,the biomass gasification model and the syngas and coal co-firing model were established by Aspen plus.The co-firing process and emission characteristics of combustion products from mixtures of different coals with biomass gas from pine gasification with 20% moisture content were investigated.The change rules of the highest combustion temperature,the flue gas volume,flue gas temperature,boiler efficiency and combustion products were obtained under different co-firing conditions.The results show that,under conditions with constant total input heat of the boiler,when the co-firing ratio of the biomass gas increased from 0%to 30%,the highest combustion temperature decreased with the coal quality,while the exhaust temperature increased gradually.The exhaust volume rose continuously and reached its maximum value when the biomass gas' s co-firing ratio reahced 20%.The fly ash in flue gas decreased,the mechanical incomplete combustion heat loss reduced,and the boiler efficiency rose gradually.
In order to analyze the influence of co-combustion of biomass gas and coal on combustion process and operation performance of the boiler,the biomass gasification model and the syngas and coal co-firing model were established by Aspen plus.The co-firing process and emission characteristics of combustion products from mixtures of different coals with biomass gas from pine gasification with 20% moisture content were investigated.The change rules of the highest combustion temperature,the flue gas volume,flue gas temperature,boiler efficiency and combustion products were obtained under different co-firing conditions.The results show that,under conditions with constant total input heat of the boiler,when the co-firing ratio of the biomass gas increased from 0%to 30%,the highest combustion temperature decreased with the coal quality,while the exhaust temperature increased gradually.The exhaust volume rose continuously and reached its maximum value when the biomass gas' s co-firing ratio reahced 20%.The fly ash in flue gas decreased,the mechanical incomplete combustion heat loss reduced,and the boiler efficiency rose gradually.
引文
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[18]张国光,姜英.锅炉各种热损失对锅炉效率的影响程度分析[J].煤质技术,2009(4):46-49.ZHANG guoguang,JIANG ying.Discussion on the influence of boiler heat loss on the boiler thermal balance efficiency[J].Coal Quality and Technology,2009(4):46-49.
[2]王金星,李超,刘慧敏,等.烟煤/生物质混燃特性实验研究[J].电力科学与工程,2012,28(2):56-59.WANG Jinxing,LI Chao,LIU Huimin,et al.Experimental study on combustion characteristics of bitumite/biomass blends[J].Electric Power Science and Engineering,2012,28(2):56-59.
[3]刘翔,陈梅倩,余冬,等.草本类生物质与烟煤混烧特性及其影响因素分析[J].农业工程学报,2012,28(21):200-207.LIU Xiang,CHEN Meiqian,YU Dong,et al.Analysis of influence factors on co-combustion characteristics of bituminous coal with herbal biomass[J].Transactions of the Chinese Society of Agricultural Engineering,2012,28(21):200-207.
[4]王晓钢,鲁光武,路进升.生物质与煤掺烧燃烧特性的实验研究[J].可再生能源,2014,32(1):87-92.WANG Xiaogang,LU Guangwu,LU Jinsheng.Experimental study on combustion characteristics of biomass and coal blended[J].Renewable Energy Resources,2014,32(1):87-92.
[5]田红,廖正祝.农业生物质燃烧特性及燃烧动力学分析[J].农业工程学报,2013,29(10):203-212.TIAN Hong,LIAO Zhengzhu.Co-combustion of biomass straw and bituminous coal:characteristics and kinetics study[J].Transactions of the Chinese Society of Agricultural Engineering,2013,29(10):203-212.
[6]卢洪波,戴惠玉,马玉鑫.生物质三组分燃烧特性及动力学分析[J].农业工程学报,2012,28(17):186-191.LU Hongbo,DAI Huiyu,MA Yuxin.Combustion characteristics and dynamic analysis of three biomass components[J].Transactions of the Chinese Society of Agricultural Engineering,2012,28(17):186-191.
[7]鲁光武,陈海平,于鑫玮,等.生物质与煤掺烧对锅炉结渣特性影响的实验研究[J].节能,2013(3):28-31.LU Guangwu,CHEN Haiping,YU Xinwei,et al.Experimental research on the slagging characteristics of biomass and coal combustion boiler[J].Energy Conservation,2013(3):28-31.
[8]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,2014,35(3):618-621.WANG Quanhai,TANG Xiuneng,ZHANG Xianchen,et al.Experimental study on characteristics of pollutant emissions from co-combustion of sawdust and coal in circulating fluidized bed[J].Journal of Engineering Thermophysics,2014,35(3):618-621.
[9]谭巍,宋景慧,李季,等.生物质循环流化床内树皮与煤混烧的试验研究[J].可再生能源,2014,32(2):216-221.TAN Wei,SONG Jinghui,LI Ji,et al.Experimental Investigation on co-firing of tree bark and coal in a circulating fluidized bed[J].Renewable Energy Resources,2014,32(2):216-221.
[10]寿恩广,李诗媛,任强强,等.生物质与煤富氧混合燃烧特性研究[J].可再生能源,2014,32(10):1551-1558.SHOU Enguang,LI Shiyuan,REN Qiangqiang,et al.Study on oxy-fuel combustion characteristics of biomass and coal blending[J].Renewable Energy Resources,2014,32(10):1551-1558.
[11]谢敬思,程世庆,张慧敏,等.O2/CO2气氛下生物质与煤混燃的NO排放特性研究[J].热力发电,2012,41(8):32-36.XIE Jingsi,CHENG Shiqing,ZHANG Huimin,et al.Experimental study on NO emission characteristic:cofiring of biomass and coal in O2/CO2atmosphere[J].Thermal Power Generation,2012,41(8):32-36.
[12]邵志伟,黄亚继,张强,等.O2/CO2气氛下污泥与烟煤混合燃烧特性[J].浙江大学学报(工学版),2014,48(10):1739-1745.SHAO Zhiwei,HUANG Yaji,ZHANG Qiang,et al.Cocombustion characteristics of sludge and bituminous coal under O2/CO2atmosphere[J].Journal of Zhejiang University(Engineering Science),2014,48(10):1739-1745.
[13]PEI X,HE B,YAN L,et al.Process simulation of oxy-fuel combustion for a 300 MW pulverized coal-fired power plant using Aspen Plus[J].Energy Conversion&Management,2013,76(12):581-587.
[14]张肖肖,杨冬,张林华.生物质与煤混燃燃烧特性研究进展[J].节能技术,2011,29(6):483-485.ZHANG Xiaoxiao,YANG Dong,ZHANG Linhua.Research status on combustion characteristics of co-firing of biomass and coal[J].Energy Conservation Technology,2011,29(6):483-485.
[15]FAL-MANSOUR F,ZUWALA J.An evaluation of biomass co-firing in Europe[J].Biomass&Bioenergy,2010,34(5):620-629.
[16]AHO M,ENVALL T,KAUPPINEN J.Corrosivity of flue gases during co-firing Chinese biomass with coal at fluidised bed conditions[J].Fuel&Energy Abstracts,2011,105(1):82-88.
[17]武岳,王永征,栗秀娟,等.生物质混煤燃烧锅炉过热器受热面金属氯腐蚀特性[J].动力工程学报,2014,34(9):690-695.WU Yue,WANG Yongzheng,LI Xiujuan,et al.Chloride corrosion characteristic of boiler heating surface due to cofiring of biomass and coal[J].Journal of Chinese Society of Power Engineering,2014,34(9):690-695.
[18]张国光,姜英.锅炉各种热损失对锅炉效率的影响程度分析[J].煤质技术,2009(4):46-49.ZHANG guoguang,JIANG ying.Discussion on the influence of boiler heat loss on the boiler thermal balance efficiency[J].Coal Quality and Technology,2009(4):46-49.