吸收式热泵及直接接触换热在燃气锅炉全热回收中的应用
Application of absorption heat pump and direct-contact heat transfer to total heat recovery for gas boiler
摘要：
从天然气特性和锅炉热效率影响因素出发，分析了实现燃气锅炉烟气全热回收的理论要求。总结了国内外已有的关于燃气锅炉烟气冷凝热回收的研究，指出实现烟气全热回收的关键技术是获得低温的冷源和保证充足的换热能力。针对北京市集中供暖系统回水温度较高的现状，提出了一种使用吸收式热泵和直接接触式换热技术的热回收系统，该系统能有效回收烟气中的显热和冷凝热资源，并能克服以往热回收技术存在的问题。实际案例分析表明，该技术具有有效性和经济性。
Abstract：
Analyses the theoretical demands for total heat recovery of a gas boiler considering the characteristics of natural gas and influencing factors of the boiler thermal efficiency. Summaries domestic and abroad studies on condensing heat recovery of the gas boiler, and points out the key to efficient total heat recovery is to achieve a low-temperature cold source and high heat transfer efficiency. Provides a new heat recovery system combining absorption heat pump with direct-contact heat exchanger based on the condition of high return temperature for heating system in Beijing. This system can recover both sensible and condensing heat of flue gas without the weakness of conventional heat recovery technology. An actual case analysis shows that this technology has availability and economic efficiency.
Keywords:absorption heat pump, direct-contact heat transfer, gas boiler, total heat recovery, condensing heat