热水型吸收式热泵回收燃煤锅炉烟气余热应用研究

Research on the Application of Waste Heat of Coal Boiler Flue Gas Recovered by Hot Water Absorption Heat Pump

摘要: 采暖季燃煤锅炉会释放出大量烟气，致使空气中弥漫着白烟，对环境造成很大污染。为改善这一现状，沧州某热力公司结合自身的需求，用一台46 MW的备用锅炉制备110度热水提取15度温差作为热泵驱动，通过热水型吸收式热泵系统对烟气余热回收利用。使用喷淋式烟气换热器和吸收式热泵作为烟气回收系统，在实现烟气降温的同时，回收烟气中的余热和凝水，有效降低供暖成本，实现降温、节能、节水的三赢目标。该技术主要用于集中供暖，经过2019~2022三个采暖期的运行，烟气温度降低到了36℃，回收8500 KW余热，满足了20多万平方米的供热缺口，取得了较好的经济效益和社会效益。暂时只考虑到了排烟湿度和温度为影响烟气余热回收的两大不利因素，今后可以对其他影响因素进行研究。

Abstract: During the heating season, coal-fired boilers release a large amount of smoke gas, resulting in white smoke in the air, causing great pollution to the environment. In order to improve this situation, a heating company in Cangzhou, based on its own needs, used a 46 MW backup boiler to prepare 110˚C hot water and extract a 15˚C temperature difference as a heat pump drive. The hot water absorption heat pump system was used to recover and utilize waste heat from flue gas. The use of spray type flue gas heat exchanger and absorption heat pump as the flue gas recovery system not only achieves flue gas cooling, but also recovers waste heat and condensate from the flue gas, effectively reducing heating costs and achieving the triple goal of cooling, energy conservation and water conservation. This technology is mainly used for centrailed heating, after the operation of three heating periods from 2019 to 2022, the flue gas temperature has been reduced to 36˚C, and 8500 KW waste heat has been recovered, which meets the heating gap of over 200,000 square meters, and achieves good economic and social benefits. For the time being, only the humidity and temperature of exhaust gas have been considered as the two major adverse factors affecting flue gas waste heat recovery, and other influencing factors can be studied in the future.