摘要
以天津市第一中心医院在用的燃气冷凝锅炉为研究对象,分析燃气冷凝锅炉基本原理以及热效率计算方法,研究燃气锅炉热效率的影响因素及各因素对热效率的影响规律。结果表明:当排烟温度从70℃降至55℃时,锅炉热效率明显提升,温度为55℃时低位热效率已高于100%,此后随温度继续下降热效率提升趋势放缓;锅炉不同燃烧方式应采用不同的过量空气系数,若采用扩散式燃烧,最佳过量空气系数范围为1.15~1.25;锅炉回水温度下降会造成热效率上升,但当回水温度低于30℃后,热效率提升速度明显变缓,控制冷凝锅炉回水温度在30~40℃范围内比较理想。
Analyzed the basic principles of gas-fired condensing boiler and the calculation method of thermal efficiency, and studied the influencing factors of gas-fired boiler efficiency and the influencing rules of each factor on thermal efficiency, with the gas-fired condensing boiler used in Tianjin First Central Hospital as the research background. The results showed when the exhaust temperature reduced from 70 ℃ to 55 ℃, the thermal efficiency increased drastically, and the low-level thermal efficiency was higher than 100% when the temperature was 55 ℃. After this temperature condition, the rise of thermal efficiency was milder with the drop of temperature. Different boiler combustion methods should adopt different excess air coefficients. With diffusion combustion, the optimal excess air coefficient should be of 1.15~1.25. The decrease of boiler return water temperature will cause the rise of thermal efficiency. But when the return water temperature was lower than 30 ℃, the thermal efficiency improving speed was significantly slower. The ideal temperature of boiler return water should be of 30~40 ℃.
作者
陈继明
马硕
李子豪
马洪亭
CHEN Ji-ming;MA Shuo;LI Zi-hao;MA Hong-ting
出处
《节能》
2020年第10期50-53,共4页
Energy Conservation
关键词
燃气锅炉
热效率
排烟温度
过量空气系数
回水温度
gas-fired boiler
thermal efficiency
exhaust temperature
excess air coefficient
return water temperature
