垃圾焚烧炉高温低氧燃烧技术可行性仿真研究  

Simulation study on the feasibility of high temperature and low oxygen combustion technology in waste incinerator

作　　者：刘泽庆 林瑜 LIU Zeqing;LIN Yu(Shanghai Environmental Sanitary Engineering Design Institute Co.,Ltd.,Shanghai 200232,China;Honeywell Technology Solution(China),Shanghai 201203,China)

机构地区：[1]上海环境卫生工程设计院有限公司,上海200232 [2]霍尼韦尔中国研发中心,上海201203

出　　处：《能源环境保护》2022年第2期1-7,共7页Energy Environmental Protection

基　　金：上海市科委项目《焚烧线高效扩能与清洁焚烧智能控制关键技术》(18DZ1202601)。

摘　　要：针对生活垃圾焚烧炉结焦及NO_(X)初始生成浓度较高的问题,在垃圾焚烧炉炉膛内采用高温低氧燃烧技术,探讨了该技术的适用性。在常规垃圾焚烧炉的前拱设置11个高温低氧喷口,对喷射流速分别为60、50、40、30 m/s的四种工况进行计算流体力学数值仿真。结果表明:在喷口速度为60 m/s和50 m/s工况下,喷射气流的卷吸和掺混能力更强,喷射气流的前端基本可达炉排表面,形成的气流旋涡覆盖了主燃区(炉排燃烧段)的高温段;燃烧段及其上方的气体组分混合较为均匀,主燃区氧气浓度(体积分数)为6.5%~7.0%;主燃区温度(约为1200 K)分布趋于一致,局部高温区的范围较小;该技术可有效缓解焚烧炉内的结焦情况,有助于降低NO_(X)的初始生成浓度。In order to solve the problems of coking and high initial NO_(X) concentration in the municipal solid waste(MSW)incinerator,high temperature and low oxygen combustion technology in the furnace of MSW incinerator was adopted,and its feasibility was discussed.Eleven high temperature and low oxygen nozzles were set on the front arch of the conventional waste incinerator.Four cases with different flow rates at 60,50,40 and 30 m/s respectively were investigated by computational fluid dynamic(CFD)numerical simulation.The results show that with the jet velocities of 60 m/s and 50 m/s,the entrainment and mixing capability of the jet fluid is stronger.The leading edge of jet can almost reach the surface of the grate,and the resulting flow vortex covers the high temperature section of the main combustion area(the combustion section on the grate).The gaseous components are mixed much more evenly in the main combustion area with the oxygen concentration in the range of 6.5%~7.0%(volume fraction).The temperature profile in the main combustion area(about 1200 K)is more uniform and characterized by smaller high-temperature-zone,which can help reduce the coking risk and the initial NO_(X) concentration in the incinerator.

关 键 词：生活垃圾焚烧炉 垃圾分类 高温低氧燃烧技术 温度场 组分场 计算流体力学数值仿真 

分 类 号：X511[环境科学与工程—环境工程]