不同尾管数量的全浸入式脉动燃烧器传热特性试验  

Experimental study on heat transfer characteristics of fully immersed pulsation combustors with different numbers of tailpipes

作　　者：金晶 许林云[1] 张爱琪 武玉柱 张海锋[1] JIN Jing;XU Linyun;ZHANG Aiqi;WU Yuzhu;ZHANG Haifeng(Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,College of Mechanical and Electronic Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学机械电子工程学院,南京林业大学林业资源高效加工利用协同创新中心,南京210037

出　　处：《林业工程学报》2023年第1期157-164,共8页Journal of Forestry Engineering

基　　金：江苏省现代农机装备与技术示范推广项目(NJ2020-19)。

摘　　要：土壤消毒是决定设施栽培产量和品质的关键环节。将高燃烧强度、高传热效率的脉动燃烧技术与无污染、消毒效果佳的土壤蒸汽消毒技术相结合,基于30 kW的单个脉动燃烧器进行结构尺寸设计,在保证燃烧室相同且燃烧器拥有相同总流通面积的前提下,确定了包括单管、双管和三管3种尾管数量,设计了一种全浸入式脉动燃烧器传热特性试验装置。试验过程中将脉动燃烧器整体浸没埋入水中,针对主要影响因素包括油门开度、尾管数量以及有无去耦室,分别测量了3种尾管数量下试验装置的油耗、水温、烟气温度、蒸汽量等。试验结果表明:脉动燃烧器油耗随油门开度增加而增大,油耗呈现单管>双管>三管的现象;增大传热面积可明显强化脉动燃烧器的传热特性,三管的烟气侧传热系数为单管的1.10~1.15倍,相同工况下烟气侧脉动流传热系数达到稳态流的5.12~5.66倍,三管蒸汽量为单管的1.32~1.67倍,热效率为单管的1.11~1.13倍,且当油门开度处于中间油门开度450°&450°时脉动燃烧器各项参数达到最优值。尽管去耦室换热性能较弱,但去耦室除降低排烟温度,提高系统热效率,还能有效降低排气噪声和减少油耗量。确定基于土壤蒸汽消毒的全浸入式脉动燃烧器的最佳组合形式为:油门开度为450°&450°、三管和设置去耦室。Soil disinfection was a key link in determining the yield and quality of facility cultivation. The pulsating combustion technology with high combustion intensity and high heat transfer efficiency was combined with the soil steam disinfection technology which has no pollution and good disinfection result. The structural size design was based on a single pulsation combustor of 30 kW to ensure that the combustion chamber remained unchanged and the burner had the unchanged total flow area. Then, three tailpipes including single, double, and triple were identified. A test device for the heat transfer characteristics of a fully immersed pulsation combustor was designed. During the test, the whole pulse burner was immersed and buried in water. The main influencing factors included the throttle opening, the number of tail pipes, and the presence or absence of decoupling chambers. The fuel consumption, water temperature, flue gas temperature, steam volume, etc. of the test device under the three tailpipes were examined respectively. The test results showed that the fuel consumption of the pulsating burner increased with the increase of the throttle opening, and the fuel consumption presented the phenomenon of single > double > triple. In addition, the increase of the heat transfer area could significantly enhance the heat transfer characteristics of the pulsation burner. The heat transfer coefficient of the three-tube flue gas side was 1.10-1.15 times that of the single-tube. Under the same working conditions, the fluctuating heat transfer coefficient on the flue gas side reached 5.12-5.66 times that of the steady state flow. Moreover, the steam vo-lume of the three-tube was 1.32-1.67 times that of the single-tube, and the thermal efficiency was 1.11-1.13 times that of the single-tube. When the throttle opening was at the intermediate throttle opening of 450° & 450°, the above parameters of the pulsation combustor reached the optimal values. Although the heat exchange performance of the decoupling chamber was weak, the

关 键 词：脉动燃烧 土壤蒸汽消毒机 尾管数量 油门开度 传热系数 

分 类 号：S497[农业科学—植物保护]