Gas-steam combined system and operation control method thereof
A combined system and gas-steam technology, applied in the energy field, can solve problems such as long payback period, unfavorable promotion, and increased initial investment of power plants, and achieve the effects of improving efficiency, improving thermal efficiency, and reducing discharge temperature
Active Publication Date: 2018-05-01
CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD
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Problems solved by technology
[0002] The operating conditions of the gas-steam combined system are adjusted in real time according to its load status. Due to load changes, the gas-steam combined system often cannot generate electricity at full load, and the efficiency of the gas-steam combined system is relatively low at low loads
[0003] At present, the main way to improve the steam cycle efficiency is to increase the steam inlet parameters of the steam turbine to improve the work efficiency of the steam turbine. However, choosing a steam turbine and waste heat boiler with a higher pressure and higher temperature will greatly increase the initial investment of the power plant and the payback period. Longer, whether it is a new unit or an old unit renovation, it is not conducive to popularization
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[0019] The present invention will be described in further detail below, but the embodiments of the present invention are not limited thereto.
[0020] Such as figure 1 As shown, the combined gas-steam system includes: a gas-fired unit, a steam circulation loop, and a preheating heat exchanger 320, the gas-fired unit includes a gas turbine 100; the steam circulation loop is provided with a waste heat boiler 210, a steam turbine 220, a condenser 230, and The condensate heater 240, the waste heat boiler 210 is equipped with a waste heat flue 211, the condensate heater 240 is installed in the waste heat flue 211, and the condensate heater 240 is provided with a preheating water inlet and a preheating water supply port; preheating The heat exchanger 320 has a first heat exchange channel and a second heat exchange channel that cooperate with each other; wherein, the waste heat flue 211 is connected to the flue gas outlet of the gas turbine 100, the inlet of the first heat exchange c...
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The invention provides a gas-steam combined system and an operation control method thereof. The gas-steam combined system comprises a gas generator set, a steam circulating loop and a pre-heating heat exchanger, wherein the pre-heating heat exchanger is provided with a first heat exchange channel and a second heat exchange channel which are matched with each other; a waste heat flue is in butt joint with a flue gas outlet of a gas turbine engine; the inlet of the first heat exchange channel is in butt joint with a pre-heating water pumping hole; the outlet of the first heat exchange channel is in butt joint with a pre-heating water compensating hole; the inlet of a second heat exchange channel is in butt joint with a fuel source or an air source; and the outlet of the second heat exchange channel is in butt joint with a fuel inlet or an air inlet of the gas turbine engine. By virtue of the pre-heating heat exchanger, the fuel or air temperature is increased, so that the exhaust gas temperature after the gas turbine engine does work is increased, steam with greater flow enters the gas turbine engine to do work, and therefore, the efficiency of the whole gas-steam combined system is improved, the flue gas exhaust temperature is reduced, and the thermal efficiency of the whole gas-steam circulation is improved.
Description
technical field [0001] The invention belongs to the field of energy, and in particular relates to a gas-steam combined system and an operation control method thereof. Background technique [0002] The operating conditions of the gas-steam combined system are adjusted in real time according to its load status. Due to load changes, the gas-steam combined system often cannot generate electricity at full load, and the efficiency of the gas-steam combined system is relatively low at low loads. [0003] At present, the main way to improve the steam cycle efficiency is to increase the steam inlet parameters of the steam turbine so as to improve the work efficiency of the steam turbine. However, choosing a steam turbine and waste heat boiler with a higher pressure and higher temperature will greatly increase the initial investment of the power plant and the payback period. Longer, whether it is a new unit or an old unit renovation, it is not conducive to promotion. Contents of the...
Claims
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IPC IPC(8): F01K23/10F02C7/224F02C7/08
CPCF01K23/106F02C7/08F02C7/224
Inventor 郑赟章正传石佳邓宏伟马雪松蔡春荣范永春李伟科
Owner CHINA ENERGY ENG GRP GUANGDONG ELECTRIC POWER DESIGN INST CO LTD