在区域供热网络中，为了保护环境，以天然气为燃料的锅炉或涡轮机越来越广泛地取代燃煤锅炉。天然气锅炉的烟气中含有大量的蒸汽，带有相当大的潜热。然而，传统的冷凝锅炉很难回收潜热，因为烟气的露点仅略高于热网回水的温度。因此，本文介绍了一种基于液体干燥剂的全热回收系统，该系统与直接接触式冷凝器相结合，通过增湿氧化空气来提高露点。该系统主要由三个填料塔组成，其中烟气或空气直接与液体干燥剂或冷却水接触。 系统中的液体干燥剂用作将水蒸气从烟气转移到氧化空气的介质。另一方面，喷射到冷凝器中的冷却水从烟气中回收显热和潜热，然后将其转移到回水中。建立了系统的数学模型，并进行了仿真。仿真结果表明，新系统的热效率为101.4%，而冷凝锅炉的热效率为97.5%。此外，烟气排放到相对湿度为56%而非100%的大气中。此外，与碱液混合的冷却水可以稀释冷凝水并吸收NOx，这有助于减少水和空气污染。 这种新型热回收系统具有节能、经济、环保等优点，在实际应用中具有广阔的前景。引用:2019年冬季会议，佐治亚州亚特兰大，会议论文

In district heating networks, natural gas fired boilers or turbines are more and more widely used in replace of coal fired boilers for the sake ofenvironmental protection. The flue gas of natural gas boilers contains a lot of vapor carrying considerable latent heat. However, the conventionalcondensing boiler can hardly recover the latent heat as the dew point of the flue gas is only marginally higher than the temperature of the return water fromheating networks. Therefore, a liquid-desiccant-based total heat recovery system combined with direct contact condenser is introduced in this paper toincrease the dew point by humidifying the oxidizing air. The system mainly consists of three packed tower, where the flue gas or air contacts directly withthe liquid desiccant or the cooling water. The liquid desiccant in the system serves as a medium to transfer water vapor from the flue gas to the oxidizingair. The cooling water sprayed into the condenser, on the other hand, recovers sensible heat and latent heat from the flue gas and then transfers it to thereturn water. A mathematical model for the system is established and a simulation is conducted. The simulation results show that the thermal efficiency ofthe novel system is 101.4%, compared with an efficiency of 97.5% of the condensing boiler. Besides, the flue gas is discharged to the atmosphere with arelative humidity of 56% rather than 100%. Moreover, the cooling water mixed with alkali liquor can dilute the condensate and absorb NOx, whichcontributes to the reduction of water and air pollution. The novel heat recovery system is promising in practical application since it is energy-efficient, costeffectiveand environmentally friendly.