丙烷火焰冲击换热机理的实验研究  

Experimental Study on the Mechanism of Propane Flame Impingement Heat Transfer

作　　者：薛治家[1] 夏永放[1] 夏畅[1] 段明达 赵雪杉[1] 

机构地区：[1]沈阳工程学院能源与动力工程学院,辽宁沈阳110136

出　　处：《沈阳工程学院学报（自然科学版）》2017年第3期217-222,共6页Journal of Shenyang Institute of Engineering:Natural Science

基　　金：国家自然科学基金自助项目(51406123)

摘　　要：冲击换热是一种高效的强化换热形式,丙烷与空气流量,火焰与锅具之间的高度及火焰冲击角度是影响丙烷火焰冲击换热中热效率与污染物排放的重要因素。实验中设置丙烷流量分别为0.2 slm、0.3 slm、0.4 slm,空气流量分别为1.3 slm、1.7 slm、2.0 slm,高度分别为30 mm、40 mm、50 mm,角度分别为0°、15°、30°,进行丙烷火焰冲击换热实验,实验结果表明:丙烷燃气流量不变时,增大空气系数,NOX增加,CO减小,热效率有3种变化,说明热效率与空气系数是非线性关系存在最佳值;高度从最小增加到最大的过程中,热效率减小,NOX先增加再减小,CO排放量保持降低趋势,实验中观察到丙烷火焰的内焰顶部边缘接触锅具时热效率最高;角度分别为0°、15°、30°时,热效率逐渐降低、NOX和CO逐渐减小。Impingement heat transfer is a kind of efficient heat transfer enhancement,which is widely used in our daily life and military industrial production. The propane and air flow,the distance between the flame and the pot,and the impact angle are the important factors affecting propane flame impingement heat thermal efficiency and pollutant emissions. The experiment set 0. 2,0. 3,0. 4slm propane flow,air flowrate of 1. 3,1. 7,30,40,2. 0 slm,height 50 mm,angle of 0 degrees and 15 degrees,30 degrees to conduct a propane flame impingement heat transfer experiment and to measure thermal efficiency and pollutant emissions. The experimental results showed that under the constant propane gas flowrate,as long as the air coefficient increases,the NOx would increase,the CO would decrease,and the thermal efficiency would have three changes. It showed that the thermal efficiency and the air coefficient were nonlinear and thermal efficiency had the best value. In the process of height turning to mix,thermal efficiency and NOx firstly increased and then decreased,and CO emissions kept a decreasing trend. It was observed that when the top edge of the inner flame propane flame touched Cookware,thermal efficiency reached the highest,and when angle to 0 degrees,15 degrees,30 degrees,thermal efficiency,NOx and CO decreased gradually.

关 键 词：冲击换热 丙烷火焰 节能 热效率 

分 类 号：O643.2[理学—物理化学]