T型煤粉锅炉富氧燃烧的数值模拟  

Numerical Simulation on Oxygen-enriched Combustion of T-shaped Pulverized Coal-fired Boiler

作　　者：田娇[1] 王勇[2] 乔晓磊[1] 蔡新春 金燕[1] 

机构地区：[1]太原理工大学电气与动力工程学院,太原030024 [2]天津大唐国际盘山发电有限责任公司,天津301907 [3]山西省电力科学研究院,太原030001

出　　处：《动力工程学报》2013年第6期419-423,436,共6页Journal of Chinese Society of Power Engineering

摘　　要：为研究采用富氧燃烧方式煤粉锅炉的燃烧特性,利用Fluent软件对一台T型煤粉锅炉的富氧燃烧过程进行了数值模拟,得到了一次风含氧体积分数变化时炉膛内温度场、速度场和烟气各组分物质的量浓度的分布.结果表明:富氧条件下整个炉膛温度水平高于空气助燃条件下;当含氧体积分数由21%增大至33%时,炉膛平均温度由1 413.2K升高为1 447.1K;当含氧体积分数增大至27%时,炉膛平均温度变化较明显,达到1 435.6K;当含氧体积分数大于29%时,炉膛平均温度变化不明显;变一次风风量富氧燃烧方式的含氧体积分数最佳范围为27%～29%.To study the oxygen-enriched combustion characteristics of pulverized coal-fired boiler, numerical simulation was carried to the combustion process of a T-shaped boiler using Fluent software, during which the in-furnace temperature field, velocity field and mass concentration distribution of various gas components were obtained under conditions of different oxygen concentrations in primary air. Results show that the overall in-furnace temperature under oxygen-enriched condition is higher than that under air combustion condition; when the oxygen volume fraction is increased from 21% to 33%, the mean furnace temperature rises from 1 413.2 K to 1 447.1 K; when the oxygen volume fraction is increased to 27%, the mean furnace temperature changes obviously, reaching 1 435.6 K; when the oxygen volume fraction is in- creased to a degree more than 29%, the mean furnace temperature basically remains unchanged; the optimal oxygen volume fraction is 27%-29% under oxygen-enriched combustion mode with variable primary air volumes.

关 键 词：煤粉锅炉 富氧燃烧 燃烧特性 数值模拟 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]