燃气锅炉的排烟温度较高是制约其热效率的重要因素之一。深度回收烟气潜热提高锅炉热效率，是目前的研究热点之一。本文拟采用水-蒸汽泵技术回收燃气锅炉烟气潜热，针对MW级燃气锅炉建立理论模型，分析了热网回水温度、空气温度和湿度及过量空气系数等因素对燃气锅炉热效率的影响规律，并对锅炉的热力性能进行了优化分析。结果表明，热网回水温度升高，系统回收烟气潜热降低，当回水温度超过68℃，系统不能回收烟气潜热；空气温湿度和过量空气系数对锅炉热效率的影响相对较小。燃气锅炉的排烟温度可降低至26.2℃，热回收效率可达到83.6%，锅炉热效率可达到106.6%。本文以7MW热负荷锅炉为例，对水-蒸汽泵技术回收潜热进行了初步技术经济分析，表明投资回收期在7年左右。

The high exhaust gas temperature of gas boiler is one of the important factors restricting its thermal efficiency. Deep recovery of flue gas latent heat to improve boiler thermal efficiency is one of the current research hotspots. This paper proposes the use of water vapor pump technology to recover the flue gas latent heat of a MW-level gas boiler. A theoretical model is established for the MW-level gas boiler, and the influence of factors such as the return water temperature of the heating network, air temperature and humidity, and excess air coefficient on the thermal efficiency of gas-fired boilers were analyzed. Furthermore, the thermal performance of the boiler is optimized. The results indicate that as the return water temperature of the heating network increases, the system's recovery of flue gas latent heat decreases, and when the return water temperature exceeds 68°C, the system cannot recover the flue gas latent heat. The impact of air temperature, humidity, and excess air coefficient on the boiler's thermal efficiency is relatively small. The exhaust gas temperature of the gas boiler can be reduced to 26.2°C, the heat recovery efficiency of the water vapor pump can reach 83.6%, and the boiler's thermal efficiency can reach 106.6%. In this paper, taking 7MW heat load boiler as an example, the preliminary technical and economic analysis of latent heat recovery by water vapor pump technology is carried out, which shows that the investment recovery period is about 7 years.

连云港创新能力建设计划(高效低碳燃气轮机试验装置)项目CX2208