0.3 MWth循环流化床污泥与煤掺烧试验  

Co-combustion characteristic of sewage sludge and coal in 0.3MW_(th) circulating fluidized bed

作　　者：蒋孟宴 张自丽 孙光 段元强[3,4] 段伦博[3,4] JIANG Mengyan;ZHANG Zili;SUN Guang;DUAN Yuanqiang;DUAN Lunbo(Sinochem Quanzhou Petrochemical Co.,Ltd.,Quanzhou 362000,China;National Industrial Boiler Quality Inspection Center,Fujian Boiler&Pressure Vessel Supervision and Investigation Institute,Fuzhou 350008,China;School of Energy and Environment,Southeast University,Nanjing 210096,China;Southeast University Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]中化泉州石化有限公司,福建泉州362000 [2]福建省锅炉压力容器检验研究院国家工业锅炉质量检验检测中心(福建),福建福州350008 [3]东南大学能源与环境学院,江苏南京210096 [4]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《洁净煤技术》2022年第3期130-138,共9页Clean Coal Technology

基　　金：国家重点研发计划资助项目(2019YFE0100100-08)。

摘　　要：污泥与煤在循环流化床锅炉中混烧不仅能实现其减量化处置,还可以作为替代燃料减少煤炭用量,实现资源化利用。在0.3 MW_(th)循环流化床中试装置上考察不同掺烧比例,一、二次风比例,过量空气系数等操作参数对城市生活污泥和徐州烟煤燃烧效率、气态污染物排放的影响规律,重点讨论了煤与污泥中氮、硫的赋存形态及其转化特性,分析了煤与污泥掺烧过程中飞灰组分及熔融特性。XPS结果表明,污泥中N主要以吡咯氮(90.58%)和季氮(9.42%)形式存在,烟煤中N主要以吡咯氮的形式存在;污泥中S主要以有机硫化物形式存在,而烟煤中S主要以稳定的无机硫酸盐形式存在;掺烧过程中,随污泥掺烧比例增加,烟气中CO体积分数升高,NO体积分数显著降低,SO_(2)体积分数略升高;二次风比例增大,NO质量浓度降低,但对SO_(2)基本无影响;过量空气系数由1.2增至1.4,NO与SO_(2)质量浓度随之增加,CO质量浓度降低;污泥掺烧比例由0增至100%时,飞灰含碳量由8.09%增至28.26%,燃烧效率由99.23%降到87.76%。相对于煤单烧,掺烧污泥降低了飞灰熔融温度。Co-combustion of sludge and coal in circulating fluidized bed(CFB)boilers can not only realize its reduction disposal,but also be used as alternative fuel to reduce the use of coal and realize resource utilization.The effects of operating parameters such as different blending ratio,primary air ratio,and excess air ratio on the combustion efficiency and gaseous pollutant emission of municipal sewage sludge and Xuzhou bituminous coal were investigated on a 0.3 MW_(th) circulating fluidized bed pilot plant.The existing forms and transfor⁃mation characteristics of nitrogen and sulfur in coal and sludge were discussed,and the components and melting characteristics of fly ash in the process of co-combustion of coal and sludge were analyzed.The XPS results indicate that N mainly exists in the form of pyrrole nitro⁃gen(90.58%)and quaternary nitrogen(9.42%)in sludge.In the bituminous coal,N mainly exists in the form of pyrrole nitrogen.The S in sludge is mainly organic sulfide,while S in bituminous coal mainly is the stable inorganic sulfate.The NO emission decreases while the SO_(2) emission increases when the proportion of sludge increases during the co-combustion process.The NO emission decreases but barely influence SO_(2) emission with increasing the secondary air ratio.The NO and SO_(2) emissions increase while the CO emission decreases when the excess air ratio increases from 1.2 to 1.4.When the proportion of sewage sludge increases from 0 to 100%,the unburned carbon in fly ash increases from 8.09%to 28.26%,while the combustion efficiency decreases from 99.23%to 87.76%.Co-combustion sludge with coal can also decrease the melting temperature of fly ash.

关 键 词：循环流化床 城市生活污泥 烟煤 掺烧 熔融特性 

分 类 号：TK16[动力工程及工程热物理—热能工程] X51[环境科学与工程—环境工程]