燃气机热泵耦合冷凝燃气锅炉烟气全热回收理论与实验研究
Theoretical and experimental study on total heat recovery from flue gas of gas-engine heat pumps coupled with condensing gas boilers
摘要：
为了达到燃气锅炉烟气冷凝潜热全回收的目标,本文提出了以铸硅铝换热器为烟气余热回收换热器,并耦合燃气机热泵机组,对冷凝燃气锅炉的低温烟气进行全热回收。搭建了耦合机组实验平台,对烟气余热回收效果进行了实验研究,分析了不同烟气余热回收换热器进口水温和不同锅炉负荷率下耦合机组的运行性能,并对机组的经济性进行了分析。结果表明,当烟气余热回收换热器进口水温为14～20 ℃时,耦合机组的总制热量稳定在645 kW左右,热效率约为110%,设备初投资回收期约为1.9个供暖季。
Abstract：
In order to achieve the goal of fully recovering the condensation latent heat from the flue gas of gas boilers, this paper proposes to use a cast silicon-aluminum heat exchanger for flue gas waste heat recovery, and couple it with a gas-engine heat pump unit to recover the total heat from the low-temperature flue gas of condensing gas boilers. An experimental platform for the coupled unit is established to conduct experimental research on the waste heat recovery effect of the flue gas. The operating performance of the coupled unit under different inlet water temperatures of the flue gas waste heat recovery heat exchanger and different boiler load rates is analysed, and the economy of the unit is analysed. The results show that when the inlet water temperature of the flue gas waste heat recovery heat exchanger is 14 to 20 ℃, the total heating capacity of the coupled unit remains stable at about 645 kW, the thermal efficiency is about 110%, and the payback period for the initial equipment investment is about 1.9 heating seasons.
Keywords:gas-engine heat pump; condensing gas boiler; coupled unit; total heat recovery from flue gas; boiler load rate; economic analysis