新颖外燃式湿空气燃气轮机循环及性能研究

NOVEL EFHAT SYSTEM AND STUDY ON ITS PERFORMANCE

本文首先提出一种新型的高效燃煤燃气轮机循环一外燃式湿空气透平循环动力系统。由于外燃的特点，作功工质为洁净湿空气，从而可以实现水的回收，是对常规ＨＡＴ循环的突破；另外洁净湿空气排放不受通常烟气露点限制，从而可回收利用湿空气降温时的低温凝结潜热，提高了加湿能力，从而提高系统性能。揭示了新型循环的基本规律；推导出具有湿化特点的约束方程和系统性能简明表达式，指明影响系统性能的关键因素。在透平初温为８５０℃的工况下，系统热效率高达４８．１１％。基于能量品位梯级利用原理和系统集成方法论，通过探索充分而合理利用中低温余热的有效途径，开拓洁净煤燃气轮机总能系统的新方向。

In this paper, we have proposed a new type of gas turbine cycle based on innovative combination of a newly designed HAT cycle with an externally fired boiler (EFHAT). Because the characteristics of the external firing, the working fluid is clean humid air, the water in it can be recycled, which is different from traditional HAT cycle; additionally, the exhaust is not limited by the dew point, therefore, the condensing latent heat can be utilized to improve humidification ability, this will enhance the efficiency of system. Furthermore, the fundamental orderliness is disclosed; the restriction equation reflecting the humidification and the concise expression of the system efficiency has been conducted. For the turbine inlet temperature (TIT) of 850℃, the thermal efficiency of the new system may be expected to be as high as 48.10%. With the principle of cascade utilization of energy and the methodology of system integration, we have opened up a new orientation for the clean coal power generation system.