防回火农林生物质碎料燃烧机设计与燃烧特性试验  

Design and Combustion Characteristics Experiment of Biomass Crushed Aggregates Burner for Anti-tempering Maize Straw and Wood Chips

作　　者：柳善建[1] 王帅超 李永军[1] 刘亚亚 刘元帅 LIU Shanjian;WANG Shuaichao;LI Yongjun;LIU Yaya;LIU Yuanshuai(School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China)

机构地区：[1]山东理工大学农业工程与食品科学学院,淄博255000

出　　处：《农业机械学报》2020年第7期346-354,共9页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51606113);山东省重点研发计划项目(2017GGX40108);山东省高等学校优势学科人才团队培育计划项目。

摘　　要：针对农林生物质碎料在燃烧时存在连续进料及稳定燃烧困难、污染排放水平较高等问题,设计一种以玉米秸秆、碎木屑为主要燃料的农林生物质碎料燃烧机,采用水平进料方式,并进行防回火回烟、炉壁冷风压保护等设计,在不同一、二次风配比下进行了燃烧特性试验。当燃烧机进入稳定燃烧阶段,以碎木屑为燃料,一、二次风配比为0.8∶0.2时,炉膛内温度在(1200±100)℃间变化,出火口烟气温度在(1000±100)℃间变化;在一、二次风配比为0.8∶0.2和0.7∶0.3两种工况下,烟气中O2、CO2、CO质量分数分别在(13±2)%、(7±2)%、(0.2±0.1)%间波动,燃烧效率分别为98.8%、98.5%。以玉米秸秆为燃料时,在相同一、二次风配比下,与燃烧碎木屑相比,炉膛内温度和出火口烟气温度均低100℃左右;在一、二次风配比为0.8∶0.2和0.7∶0.3两种工况下,与燃烧碎木屑相比,燃烧烟气中O2平均含量约低1%,CO含量略高,CO2含量相差不大,燃烧效率分别为98.7%、98.9%。与一、二次风配比为0.8∶0.2相比,当一、二次风配比为0.7∶0.3时,以碎木屑或玉米秸秆为燃料时的炉内温度、出火口温度均低100℃左右。经JCP-HD型林格曼黑度计观测,以玉米秸秆或碎木屑为燃料,在一、二次风配比为0.8∶0.2和0.7∶0.3时排放的烟气林格曼黑度小于等于1级。当一、二次风配比为0.8∶0.2时,以碎木屑为燃料,烟气中PM2.5、PM5、PM10变化范围分别为56~72 mg/m^3、38~51 mg/m^3、43~63 mg/m^3,以玉米秸秆为燃料,分别为36~43 mg/m^3、21~35 mg/m^3、38~42 mg/m^3,满足锅炉大气污染物排放标准要求。In order to solve the difficulties in continuous feeding and stable combustion,and high pollution emission level during the combustion of maize straw and wood chips,a biomass crushed aggregates burner with horizontal feeding mode,anti-tempering and cold air pressure protection of furnace wall were designed.The combustion experiments were carried out at different ratios of primary to secondary air.The main conclusions were as follows:the temperature variation range inside the furnace was varied as(1200±100)℃when the proportion of primary to secondary air(PPSA)was 0.8∶0.2 and the wood chips was used as fuel in the stable combustion stage.The temperature of the flue gas at the outlet was varied at(1000±100)℃.Under the conditions of PPSA was 0.8∶0.2 or 0.7∶0.3,the O2,CO2 and CO mass fraction in the flue gas was fluctuated at(13±2)%,(7±2)%and(0.2±0.1)%,respectively.The combustion efficiency were 98.8%and 98.5%,respectively.When maize straw was fuel,under the same PPSA,compared with burning wood chips,the temperature in the furnace and the temperature of the flue gas was lower by about 100℃.No matter the PPSA was 0.8∶0.2 or 0.7∶0.3,the average O2 content in combustion flue gas was slightly lower,about 1%.The CO content was slightly higher,but the CO2 content was not remarkably different.The combustion efficiency was 98.7%and 98.9%,respectively.Compared with the PPSA was 0.8∶0.2,when the PPSA was 0.7∶0.3,whether the wood chips or maize straw were fuel,the temperature inside the furnace and the temperature at the outlet were lower than the former by about 100℃.The blackness of exhaustion(Ringelman emittance,level)was less than or equal to 1 when the PPSA was 0.8∶0.2 and 0.7∶0.3.When the PPSA was 0.8∶0.2,the PM2.5,PM5 and PM10 in the flue gas was respectively in the range of 56~72 mg/m^3,38~51 mg/m^3 and 43~63 mg/m^3 with wood chips as the fuel.When corn stalk was fuel,it was respectively in the range of 36~43 mg/m^3,21~35 mg/m^3 and 38~42 mg/m^3,which met the emission standards of atmosph

关 键 词：生物质 碎木屑 玉米秸秆 燃烧机 燃烧特性 防回火 

分 类 号：TK6[动力工程及工程热物理—生物能]