An Assessment of the Thermodynamic Performance of Mixed Gas-Steam Cycles: Part A — Intercooled and Steam-Injected Cycles
An Assessment of the Thermodynamic Performance of Mixed Gas-Steam Cycles: Part A — Intercooled and Steam-Injected Cycles
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混合气体-蒸汽循环的热力学性能评估：A 部分 - 中间冷却和注蒸汽循环
DOI：
10.1115/94-gt-423
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
P. Chiesa
中科院分区：
文献类型：
--
作者：
E. Macchi;S. Consonni;G. Lozza;P. Chiesa
本文讨论了蒸汽或水与空气(或燃烧气体)混合的动力循环的热力学，以改善燃用清洁燃料的固定燃气轮机循环的性能。特别是，我们考虑了现代高性能、高效率航空衍生发动机的改进型循环。本文分为两部分。在简要介绍了计算方法之后，在A部分，我们回顾了中间冷却的含义，并分析了注汽循环(STIG和ISTIG)。在B部分中，我们研究注水循环(RWI和HAT)。由于冷却剂温度较低，中间冷却可以减少涡轮冷却流量和/或提高涡轮入口温度。结果表明，这可以显著提高基于航空发动机的简单循环和联合循环系统的功率和效率；基于重型机械的系统也经历了功率输出的增加，但效率几乎没有改善。主要由于蒸汽/空气混合的不可逆性，即使在涡轮进口温度为1500°C时，中间冷蒸汽喷射循环的效率也不能达到52%-53%。另一方面，通过实现更可逆的水-空气混合，B部分中分析的循环可以达到与传统的“非混合”联合循环相当(RWI循环)甚至更高的效率(HAT循环)。版权所有1994，ASME
This paper discusses the thermodynamics of power cycles where steam or water are mixed with air (or combustion gases) to improve the performance of stationary gas turbine cycles fired on clean fuels. In particular, we consider cycles based on modified versions of modern, high-performance, high-efficiency aero-derivative engines.The paper is divided into two parts. After a brief description of the calculation method, in Part A we review the implications of intercooling and analyze cycles with steam injection (STIG and ISTIG). In Part B we examine cycles with water injection (RWI and HAT).Due to lower coolant temperatures, intercooling enables to reduce turbine cooling flows and/or to increase the turbine inlet temperature. Results show that this can provide significant power and efficiency improvements for both simple cycle and combined cycle systems based on aero-engines; systems based on heavy-duty machines also experience power output augmentation, but almost no efficiency improvement.Mainly due to the irreversibilities of steam/air mixing, intercooled steam injected cycles cannot achieve efficiencies beyond the 52–53% range even at turbine inlet temperatures of 1500°C. On the other hand, by accomplishing more reversible water-air mixing, the cycles analyzed in Part B can reach efficiencies comparable (RWI cycles) or even superior (HAT cycles) to those of conventional “unmixed” combined cycles.Copyright © 1994 by ASME