垃圾焚烧炉中城市生活垃圾掺烧高热值工业固废的数值模拟  

Numerical simulation of municipal domestic waste blending with combustion ofhigh calorific value industrial solid waste in waste incineration furnace

作　　者：杨旭 余昭胜[3] 何玉荣[1] 宾衍辉 马晓茜[3] YANG Xu;YU Zhaosheng;HE Yurong;BIN Yanhui;MA Xiaoqian(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Huizhou Branch,Guangdong Institute of Special Equipment Inspection and Research,Huizhou 516000,China;School of Electric Power,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001 [2]广东省特种设备检测研究院惠州检测院,广东惠州516000 [3]华南理工大学电力学院,广东广州510641

出　　处：《洁净煤技术》2023年第9期98-108,共11页Clean Coal Technology

基　　金：广东省重点领域研发计划资助项目(2020B1111380001)。

摘　　要：垃圾焚烧炉的高效稳定运行及减少NO_(x)排放是目前城市生活垃圾焚烧过程中所面临的挑战。以某500 t/d垃圾焚烧炉为对象,研究了城市生活垃圾(MSW)掺混高热值废弃物(ISW)下不同配风方案对燃烧过程、流场分布的影响和最佳选择性非催化还原(Selective Non-Catalytic Reduction,SNCR)工艺参数。结果表明,不同各级一次风配比床层对应的最高温度基本不变,但增加炉排一二级风室配风,挥发分析出和固定碳燃烧提前,挥发分析出最大速率提高。良好的二次风喷入角度能有效组织炉内气流流动,在工况7下,炉内高温贴墙现象最轻,流线分布较合理,因此该工况下的二次风角度设置最合理。喷入SNCR还原剂显著减少NO_(x)排放量,喷射速度为50 m/s时,脱硝效率最高,可达33.96%。因此在实际使用中,建议采用合适的配风和二次风喷入角度,并结合SNCR技术进行NO_(x)减排。The efficient and stable operation of waste incinerators and the reduction of NO_(x)(nitrogen oxides)emissions are the currently challenges faced in the process of municipal solid waste(MSW)incineration.Taking a 500 t/d waste incinerator as an object,the effects of different air distribution schemes on the combustion process,flow field distribution and the optimal selective non-catalytic reduction(SNCR)process parameters were investigated for MSW mixed with high calorific value waste(ISW).The results show that the maximum temperature corresponding to the bed layer of different levels of primary air ratios remains basically unchanged.However,the maximum rate of volatilization analysis out increases,and the combustion of volatile and fixed carbon is advanced by increasing the air distribution in the first and second air chambers of the grate.A good secondary air injection angle can effectively organize the airflow in the furnace.Under condition 7,the phenomenon of high temperature sticking to the wall in the furnace is the lightest,and the distribution of flow lines is also more reasonable,so the secondary air angle setting in this working condition is the most reasonable.After SNCR reductant injection,NO_(x)emissions are significantly reduced,and the denitrification efficiency is highest when the injection speed is 50 m/s,up to 33.96%.Therefore,it is recommended to use suitable air distribution and secondary air injection angles and to combine with SNCR technology for NO_(x)reductionin actual operation.

关 键 词：工业固废 城市生活垃圾 氮氧化合物 配风优化 垃圾焚烧炉 数值模拟 

分 类 号：X799.3[环境科学与工程—环境工程]