Gas-steam combined system and operation control method thereof

Abstract

The invention provides a gas-steam combined system and an operation control method thereof, wherein the gas-steam combined system comprises a gas generator unit, a steam circulating loop, a pre-heating circulating hoop and a heating branch, wherein a fuel heater is arranged on the heating branch; the fuel heater is provided with a first heat exchange channel and a second heat exchange channel which are matched; the inlet and the outlet of the first heat exchange channel are respectively in butt joint with a water pumping hole and a water compensating hole; the inlet of the second heat exchange channel is in butt joint with the pre-heating heat exchanger; and the outlet of the second heat exchange channel is in butt joint with the gas inlet of a gas turbine engine. A pre-heated circulating working medium circulates in the pre-heating circulating loop for heating the gas entering the gas turbine engine, so that the gas temperature is increased, and steam with greater flow enters the gas turbine engine to do work, thereby improving the efficiency of the whole gas-steam combined system, and avoiding greatly increasing the manufacturing cost of the whole system while improving the thermal efficiency.

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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