首页|基于CFD的垃圾焚烧锅炉二次风喷入角度优化研究

基于CFD的垃圾焚烧锅炉二次风喷入角度优化研究

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为研究二次风喷入角度对焚烧锅炉炉膛内温度、烟气速度、烟气停留时间、排烟热损失的影响以及二次风喷入角度与焚烧炉出口处NOx浓度的关联性,采用UDF编译边界条件和Fluent耦合的方法,针对某 600 t/d城市生活垃圾焚烧锅炉的前后墙二次风喷入角度进行数值模拟.模拟的前墙二次风喷入角度变化为 68°～80°,后墙二次风喷入角度变化为 61°～73°,二次风风速为 42 m/s,二次风温度为 301.15 K.结果表明:后墙二次风喷入角度不变时,随着前墙二次风喷入角度增加,NOx浓度先升高后下降(最低为 142.23 mg/m3),且焚烧炉排烟热损失降低(最小为 7.12%);前墙二次风喷入角度不变时,随着后墙二次风喷入角度增加,NOx浓度也呈现先升高后下降的趋势(最低为 149.15 mg/m3),且焚烧炉排烟热损失先升高后降低(最小为 7.46%);前后墙二次风喷入角度分别为 80°和 67°时,SNCR两层喷枪之间的平均温度为 1 229.59 K,停留时间为 1.63 s,与其他工况相比更加接近SNCR脱硝的最佳反应温度和停留时间,第一烟道出口处的平均温度为 1 211.36 K且停留时间大于 2 s,有助于抑制二噁英的生成.
Optimization of secondary air injection angle for garbage incineration boiler based on CFD
In order to study the influence of the secondary air injection angle on the temperature,speed,flue gas residence time and exhaust heat loss in the furnace of the incineration boiler and the correlation between the secondary air injection angle and the NOx concentration at the incinerator outlet,the UDF compiler boundary condition and Fluent coupling method were adopted.The secondary air injection angle of front and rear walls of a 600 t/d municipal solid waste incineration boiler was numerically simulated.The simulated variation range of the front wall secondary air injection angle was 68°-80°,the variation range of the rear wall secondary air injection angle was 61°-73°,the secondary wind speed was 42 m/s,and the secondary air temperature was 301.15 K.The results showed that when the secondary air injection angle of the rear wall was constant,the NOx concentration increased first and then decreased with the increase of the secondary air injection angle of the front wall.The minimum concentration of NOx was 142.23 mg/m3,the heat loss of exhaust smoke from the incineration furnace was reduced,and the minimum heat loss of exhaust smoke was 7.12%.When the secondary air injection angle of the front wall remained unchanged,the NOx concentration increased first and then decreased with the increase of the secondary air injection angle of the rear wall.The minimum concentration of NOx was 149.15 mg/m3,the heat loss of exhaust smoke from the incineration furnace increased first and then decreased,and the minimum heat loss of exhaust smoke was 7.46%.When the secondary air injection angle of front and rear walls was 80° and 67°,respectively,the average temperature between the two layers of SNCR spray guns was 1 229.59 K,and the residence time was 1.63 s,which was closer to the optimal reaction temperature and residence time of SNCR denitrification compared with other conditions.The average temperature at the exit of the first flue was 1 211.36 K,and the residence time was greater than 2 s,which helped to inhibit the formation of dioxins.

incineration boilernumerical simulationsecondary air injection angleNOx concentrationexhaust heat lossSNCR denitrification

陈为晶、孙加康、郑闽锋、龚凌诸、唐方舟

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福建省计量科学研究院,福建省能源计量重点实验室

福建雪人股份有限公司

福建理工大学生态环境与城市建设学院

焚烧锅炉 数值模拟 二次风喷入角度 NOx浓度 排烟热损失 SNCR脱硝

国家重点研发计划福建省能源计量重点实验室开放基金福建理工大学科研启动基金福建省科技计划福建省市场监督管理局科技项目

2022YFF0606404NYJL-KFKT-2021-02GY-Z151262022R1016005FJMS2021007

2024

10.12153/j.issn.1674-991X.20230489

环境工程技术学报
中国环境科学研究院

环境工程技术学报

CSTPCD北大核心
影响因子：1
ISSN：1674-991X
年,卷(期)：2024.14(2)
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