燃煤锅炉掺烧松木气燃烧过程数值模拟研究  

Numerical study of the combustion process of pine gas co-firing in a coal-fired boiler

作　　者：张小桃 闻猛 王爱军 赵伟 Zhang Xiaotao;Wen Meng;Wang Aijun;Zhao Wei(School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450011, China)

机构地区：[1]华北水利水电大学电力学院,河南郑州450011

出　　处：《可再生能源》2017年第11期1595-1600,共6页Renewable Energy Resources

基　　金：河南省教育厅自然科学研究计划项目(2011A140014);河南省科技发展计划(112102210281)

摘　　要：为了分析掺烧松木气对燃煤锅炉燃烧过程以及燃烧产物的影响,基于Fluent软件搭建了松木气与煤粉的混合燃烧模型,对300 MW燃煤锅炉的纯煤燃烧以及掺烧10%,20%,30%生物质气的4种工况进行数值模拟。在保证锅炉总输入热不变的情况下,得到了不同工况下锅炉炉膛内燃烧温度、烟气组分和NOx排放随炉膛高度的分布情况。模拟结果表明:与纯煤燃烧工况相比,掺烧松木气时炉内燃烧温度有明显下降,当掺烧比例分别为10%,20%,30%时,燃烧区域截面平均温度分别下降了46,88,104 K;掺烧松木气也会引起了烟气组分的变化,炉膛下部的O2体积分数明显增大,CO和CO2的体积分数明显减小;随着松木气掺烧比例的增加,锅炉炉膛出口处的NOx的质量浓度分别下降了47,148,198 mg/m3。In order to analyze the influence of coal-fired boiler co-firing with pine gas on the combustion process and products, a model of pine gas co-firing with coal was built based on the Fluent software to simulate the combustion process under the conditions of four cases, such as pure coal combustion and 10%, 20% and 30% pine gas co-firing ratio. Based on the same total input heat,the combustion temperature distribution in furnace, the main flue gas components, and the pollutant emission of NOxwith the change of the furnace height were obtained. The results showed that,compared with the pure coal combustion case, the mean combustion temperature of co-firing decreased significantly, which were 46, 88,104 K respectively when the pine gas co-firing ratio were10%, 20% and 30%. The flue gas composition decreased also due to the pine gas co-firing. At the lower part of the furnace, the O2 volume fraction increased, the volume fraction of CO and CO2 decreased obviously. The mass concentration decreased by 47,148,198 mg/m^3 respectively at the outlet of furnace with the increase of co-firing ratio.

关 键 词：燃煤锅炉 松木气 混合燃烧 数值模拟 

分 类 号：TK6[动力工程及工程热物理—生物能] S216.4[农业科学—农业机械化工程]