六盘水师范学院学报2024，Vol.36Issue(3)：1-10,10.DOI:10.16595/j.1671-055X.2024.03.001
空气旋流强度对低热值煤层气扩散燃烧特性影响的数值模拟研究
Numerical Study on the Influence of Inlet Air Swirl Intensity on Diffusion Combustion Characteristics of Low Calorific Value Coalbed Methane
摘要
Abstract
China is rich in coalbed methane resources,its reserves rank third in the world,but the utilization rate is very low,and the utilization form is single,especially the low calorific value coalbed methane extracted underground.Because the methane concentration is only 10%-30%,at present,it mainly adopts the way of emptying,resulting in huge energy waste and environmental problems.Swirling combustion technology,by orga-nizing fuel or oxidant into the burner in a swirling way to form a jet,using swirling combustion to optimize the combustion conditions,can effectively improve the combustion intensity and significantly improve the stability of the flame.A large number of engineering practices have verified that swirl combustion technology is suitable for the combustion of low calorific value gas.In this paper,the swirl combustion model of low calorific value coalbed methane is established by computational fluid dynamics.Based on the comparison and verification with the data of related literatures,the relationship between the swirl intensity of air incidence and the diffusion com-bustion characteristics of low calorific value coalbed methane is numerically simulated from the aspects of swirl flow field,flame temperature and radiation heat transfer.The results show that When the swirl number increas-es from 0 to 0.6,a recirculation zone is formed in the furnace,and the combustion products are generated in the inner recirculation zone.Fuel and air can be mixed more effectively,thus eliminating the high temperature zone,reducing NOx emissions and improving combustion efficiency.In addition,with the increase of swirl num-ber,the distribution of radial flow field is improved.Although the maximum flame temperature decreases,the flame heat transfer area increases,which makes the radiation efficiency increase by 36.5%and NOx emission decrease by 58.6%.In order to solve the two opposite and contradictory problems caused by swirl intensity to stable ignition,the swirl number should be controlled between 0.3 and 0.4.关键词
低热值煤层气/旋流燃烧技术/旋流强度/数值模拟研究Key words
Low calorific value coalbed methane/Swirl combustion technology/Swirling intensity/Numerical simulation分类
能源科技引用本文复制引用
周宇,张琦琦,熊亚鑫..空气旋流强度对低热值煤层气扩散燃烧特性影响的数值模拟研究[J].六盘水师范学院学报,2024,36(3):1-10,10.基金项目
贵州省科技厅科学技术基金"低热值煤层气掺混二甲醚扩散燃烧特性及其互换性研究"(黔科合基础-ZK[2021]一般280) （黔科合基础-ZK[2021]一般280）
六盘水师范学院一流本科专业建设点项目"能源与动力工程一流本科专业建设"(LPSSYylzy2008) （LPSSYylzy2008）
六盘水市红果开发区龙鼎工贸有限公司横向项目"新型钙钛矿复合氧化物的建构及其低浓度瓦斯催化燃烧性能研究"(LD-LPSSY-ZY-2021-01). （LD-LPSSY-ZY-2021-01）
