Gas-steam combined system and operation control method thereof

Abstract

The invention relates to a gas-steam combined system and an operation control method thereof. The gas-steam combined system comprises a gas turbine, a steam circulation loop, an absorption heat pump, an absorption refrigerating machine, a front heat exchanger and a switching device, wherein the switching device is in butt joint with the absorption heat pump, the absorption refrigerating machine and the front heat exchanger respectively, so as to switch the absorption refrigerating machine between the state of coming into use and the state of out of use. Part of water vapor in a steam turbine enters a heating driving passage from an extraction opening to be used as driving power of the absorption heat pump, so that a cycle fluid is heated in a second heat exchange passage, and cooling water is cooled in a first heat exchange passage; and heated cycle fluid is used for preheating air flowing through a fourth heat exchange passage or driving the absorption refrigerating machine to precool air, so as to adjust the temperature of air entering the gas turbine, and achieve optimal efficiency of the whole gas-steam combined system.

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...

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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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