| 摘要 |
An intercooled gas turbine driven powerplant (10) employing a high pressure two-pass heat exchanger (42) down stream of the final stage of compression (22) is disclosed herein. The flow of hot, highly compressed air is cooled in the first pass (54) of the high pressure heat exchanger by a counter current in-tube flow of either water (76) alone, or preferably, of a cold methane/water (76, 78) mixture. The flow of air, thus cooled, is then available, in the second pass (56) of the high pressure heat exchanger (42), to accept exhaust heat or the low grade heat, usually rejected, that is found in the heated fluid from the intercooler (36). The cool air is thus preheated, by the return to the cycle of exhaust heat, intercooler heat, and/or low grade heat from the operation of ancillary equipment prior to its entry into the combustor (48). Additionally, if a methane/water two-phase feed is used to cool the first stage (54) of the heat exchanger (42), the superheated mixture of steam and methane produced by the heat exchanger provides the ingredients to produce a low NOx fuel for the gas turbine combustor (48). Thus the first pass (54) of the high pressure heat exchanger (42) cools the high pressure discharge air flow and simultaneously generates the low NOx fuel gas (or if water alone is used, a quantity of steam for use in any industrial process). The second pass (56) of the high pressure heat exchanger (42) reheats the air flow with the exhaust heat or intercooler heat and simultaneously cools the water (or other heat transfer fluid) and returns that cold fluid to the intercooler (36) or exhaust heat exchanger. In an alternative embodiment, the dual heat exchanger (42) is positioned as an intercooler between stages of compressor (20, 22) instead of downstream of the final stage of compression (22). The first pass (54) of the dual exchanger preheats the fuel (78), which is then routed to a fuel superheater (166) in the exhaust gas stream prior to being injected into the combustor (48). The intercooled air from the final compressor stage (22) is routed to an exhaust heat recuperator (174), where it is heated prior to being injected into the combustor (48).
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