利用循环流化床锅炉烟气余热干燥废木材方案比较
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摘要
为解决浙江某生物质电厂75 t/h循环流化床生物质直燃锅炉运行中存在的排烟温度高达180~190℃带来的效率降低,以及燃料废木材含水率超过45%会导致锅炉熄火的问题,提出利用锅炉尾部烟气余热加热空气、水等不同介质将排烟温度降低至150℃以下,同时利用加热后的介质间接干燥废木材,从而将废木材含水率降低5%左右,达到锅炉对燃料含水率的适应范围要求。同时,通过对不同介质加热废木材的能量平衡和质量平衡计算以及经济性分析,认为利用循环流化床锅炉烟气余热干燥废木材的最佳干燥方式为空气预热器加干燥机方案。
In order to solve the problem of the low efficiency brought by the exhaust gas temperature up to 180~ 190 ℃ of a 75 t/h biomass circulating fluidized bed boiler in a biomass power plant in Zhejiang and the boiler flameout brought by the water content of the waste wood higher than 45%,this study presents that,the exhaust gas temperature is reduced to below 150 ℃ by using the boiler waste heat to heat air,water and other different media.And the waste wood moisture content is decreased to 5% by using the heated medium to dry wood waste indirectly to meet the water content requirements of fuel for the boiler.Meanwhile,the energy balance,mass balance and economic efficiency of heating waste wood by different media are calculated.The results show that the method of air preheater plus dryer is considered to be the best drying method of dry waste wood by the waste heat from flue gas of circulating fluidized bed boiler.
In order to solve the problem of the low efficiency brought by the exhaust gas temperature up to 180~ 190 ℃ of a 75 t/h biomass circulating fluidized bed boiler in a biomass power plant in Zhejiang and the boiler flameout brought by the water content of the waste wood higher than 45%,this study presents that,the exhaust gas temperature is reduced to below 150 ℃ by using the boiler waste heat to heat air,water and other different media.And the waste wood moisture content is decreased to 5% by using the heated medium to dry wood waste indirectly to meet the water content requirements of fuel for the boiler.Meanwhile,the energy balance,mass balance and economic efficiency of heating waste wood by different media are calculated.The results show that the method of air preheater plus dryer is considered to be the best drying method of dry waste wood by the waste heat from flue gas of circulating fluidized bed boiler.
引文
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[2]PANG S S,MUJUMDAR A S.Drying of woody biomass for bioenergy:drying technologies and optimization for an integrated bioenergy plant[J].Drying Technology,2010,28(5):690-701.
[3]LUK H T,LAM T Y G,OYEDUN A O,et al.Drying of biomass for power generation:a case study on power generation from empty fruit bunch[J].Energy,2013,63(1):205-215.
[4]GONZáLEZ J F,LEDESMA B,ALKASSIR A,et al.Study of the influence of the composition of several biomass pellets on the drying process[J].Biomass and Bioenergy,2011,35(10):4399-4406.
[5]LI H,CHEN Q,ZHANG X,et al.Evaluation of a biomass drying process using waste heat from process industries:A case study[J].Applied Thermal Engineering,2012,35(3):71-80.
[6]HAQUE N,SOMERVILLE M.Techno-economic and environmental evaluation of biomass dryer[J].Procedia Engineering,2013,56:650–655.
[7]张璧光,谢拥群.木材干燥的国内外现状与发展趋势[J].干燥技术与设备,2006(1):7-14.ZHANG Biguang,XIE Yongqun.International present situation and developing trends of wood drying[J].Drying Technology and Equipment,2006(1):7-14.
[8]唐东林.生物质能发电厂烟气余热回收技术应用与效益[J].企业技术开发,2012,31(11):40-42.TANG Donglin.Application and effect of flue gas waste heat recovery technology in biomass power plant[J].Technological Development of Enterprise,2012,31(11):40-42.
[9]刘媛.锅炉尾部烟气余热利用[J].科技资讯,2010(18):44.LIU Yuan.Waste heat utilization of boiler tail flue gase[J].Science and Technology Information,2010(18):44(in Chinese).
[10]沈望俊,刘建忠,虞育杰,等.低品位热源干燥低阶煤技术研究进展[J].热力发电,2013,42(5):1-6.SHEN Wangjun,LIU Jianzhong,YU Yujie,et al.Advance research on low grade heat source drying low-rank coal technology[J].Thermal Power Generation,2013,42(5):1-6.
[11]罗君,余春江,翟相和,等.典型软木热风干燥特性及干燥模型研究[J].热力发电,2016,45(3):26-33.LUO Jun,YU Chunjiang,ZHAI Xianghe,et al.Hot-air drying characteristics of typical cork and the drying model[J].Thermal Power Generation,2016,45(3):26-33.
[12]王志超,姚伟,张小宏,等.烟气预干燥褐煤热经济性分析[J].热力发电,2016,45(6):5-10.WANG Zhichao,YAO Wei,ZHANG Xiaohong,et al.Thermal economic analysis of flue gas pre-drying lignite[J].Thermal Power Generation,2016,45(6):5-10.
[13]赵恩婵,张方炜,赵永红.火力发电厂烟气余热利用系统的研究设计[J].热力发电,2008,37(10):66-70.ZHAO Enchan,ZHANG Fangwei,ZHAO Yonghong.Study on and design of residual heat utilization system for flue gas in thermal power plants[J].Thermal Power Generation,2008,37(10):66-70.
[14]傅庚福,孙军,赵凯峰,等.太阳能蓄热技术及其在木材干燥系统中的应用[J].应用能源技术,2007(10):40-42.FU Gengfu,SUN Jun,ZHAO Kaifeng,et al.Solar energy storage technology and its application in the wood drying system[J].Applied Energy Technology,2007(10):40-42.
[15]李爱民,任远,李水清,等.木块在回转窑内热解特性的试验研究[J].燃烧科学与技术,1999(2):121-127.LI Aimin,REN Yuan,LI Shuiqing,et al.Experimental study on gas yield for wood chips pyrolysis in rotary kiln[J].Journal of Combustion Science and Technology,1999(2):121-127.
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