棉秆掺烧对燃煤锅炉燃烧特性影响的数值模拟研究  

Numerical Simulation Study on Combustion Characteristics Influences When Co-Firing Cotton Stalks in Coal-Fired Boiler

作　　者：刘宁 魏博[1] 王珊[1] 刘坤朋 王建江 程泽宁 LIU Ning;WEI Bo;WANG Shan;LIU Kunpeng;WANG Jianjiang;CHENG Zening(State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,Xinjiang Key Laboratory of Coal Clean Conversion and Chemical Process,School of Chemical Engineering and Technology,Xinjiang University,Urumqi 830017,China;Zhundong Energy Research Institute,Xinjiang Tianchi Energy Co.,Ltd.,Changji 831100,China)

机构地区：[1]新疆大学化工学院,省部共建碳基能源资源化学与利用国家重点实验室,新疆煤炭清洁转化与化工过程重点实验室,新疆乌鲁木齐830017 [2]新疆天池能源有限责任公司准东能源研究院,新疆昌吉831100

出　　处：《锅炉技术》2024年第2期1-6,共6页Boiler Technology

基　　金：新疆维吾尔自治区重大科技专项资金项目(2022A01002-2);庭州青年计划项目(2021QN08)。

摘　　要：以某热电公司330 MW锅炉为研究对象,基于Fluent数值模拟软件对煤粉与棉秆混燃特性进行研究。以其结构参数与运行参数为依据,研究纯煤工况以及生物质不同掺烧比例、不同掺烧方式的6种工况。通过分析各个工况时炉膛的速度场、温度场、烟气组分及污染物NO的变化趋势,确定出最佳燃烧方式以提高燃煤效率,减少NO污染物排放。结果显示:相比于纯煤燃烧,掺烧棉秆后炉内主燃区温度降低,炉膛出口O_(2)含量减少,NO排放量随掺烧比例增大而减小。在掺烧方式的比较中,只在D层喷入棉秆有利于减少NO排放,其NO排放率较混合燃烧工况降低了15.2%。Taking the 330 MW boiler of a thermal power plant as the research object, co-firing pulverized coal and cotton stalk is studied using Fluent software. Based on its structural parameters and operation parameters, six working conditions of pure coal, various mixing ratios of biomass and various mixing models are studied. By analyzing the variation trend of velocity field, temperature field, flue gas component and NO in furnace in several working conditions, the most suitable combustion mode is determined to improve coal combustion efficiency and reduce the emission of pollutant NO. The results show that compared with pure coal combustion, the temperature in the main combustion zone of the furnace decreases after co-firing the cotton stalks, and the O_(2) content at the furnace outlet decreases. And the emission of NO declines with the increase of mixing ratio. In the comparison of mixing models, only firing cotton stalks in D layer is beneficial to reduce NO emission, which reduced by 15.2% compared with the mixing combustion condition.

关 键 词：掺烧方式 棉秆 燃烧特性 数值模拟 

分 类 号：TK212[动力工程及工程热物理—动力机械及工程]