多孔介质燃气热水炉的试验研究  

Experimental research of porous media gas-fired hot water stove

作　　者：王恩宇[1] 高攀 沈家利 刘联胜[1] 苟湘[1] 吴晋湘[1] WANG En-yu;GAO Pan;SHEN Jia-li(School of Energy and Environmental Engineering,Hebei University of Technology, Tianjin 300401, China)

机构地区：[1]河北工业大学能源与环境工程学院

出　　处：《能源工程》2019年第4期72-77,共6页Energy Engineering

基　　金：国家自然科学基金资助项目(51276055);河北省应用基础研究计划重点基础研究项目(13964308D)

摘　　要：针对燃气热水炉热效率低,污染物排放高的问题,设计了一台冷凝式多孔介质燃气热水炉。在定水流量的条件下,研究了燃气热水炉的燃烧、换热和污染物排放特性。结果表明:在当量比为0.9的条件下,该燃气热水炉基于低位发热量的热效率均大于99.0%,最高可达106.8%;燃烧强度在403.9 kW/m^2的工况下,热水温升可达57℃;燃烧强度是影响燃气热水炉热效率和热水温升的主要因素;烟气出口CO浓度可控制在300 mL/m^3以下,NO_x浓度均低于45 mg/m^3;燃烧室压降随燃烧强度的增大而增大,随当量比的增大而减小。该多孔介质燃气热水炉具有高效、低污染物排放的特性,多孔介质填充造成的流动阻力增加可控制在1000 Pa以内。A porous media gas-fired condensing hot water stove was designed to resolve the problem of low thermal efficiency and high pollution. The combustion, heat transfer and resistance characteristics of the gas-fired hot water stove were studied in constant water flow rate cases. The results showed that the thermal efficiency of the gas-fired hot water stove was more than 99.0% and could reach 106.8%. The hot water temperature could rise by 57℃ at a combustion intensity of 403.9 kW/m 2. Combustion intensity was the main factor that affected the thermal efficiency and the hot water temperature rise of the gas-fired hot water stove. The CO concentration at outlet could be controlled as low as 300 mL/m 3 and the NO x concentration could be lower than 45 mg/m 3. The pressure drop of combustion chamber increased with the increase of combustion intensity and decrease of equivalence ratio. The porous media gas-fired condensing hot water stove had the characteristics of high efficiency and low pollutant emission. The increase of pressure drop due to the addition of porous media in combustor could be controlled below 1000 Pa.

关 键 词：冷凝式 多孔介质 热效率 燃气热水炉 

分 类 号：TK16[动力工程及工程热物理—热能工程]