Fuel gas and steam combination system and running control method thereof

Abstract

The invention relates to a fuel gas and steam combination system and a running control method thereof. The fuel gas and steam combination system comprises a gas turbine, a steam circulating loop, an absorption type heat pump and a preheating heat exchanger, wherein a residual heat boiler, a steam turbine and a condenser are arranged on the steam circulating loop, and a steam extraction opening is formed in the steam turbine; the absorption type heat pump is provided with a first heat exchange channel, a second heat exchange channel and a driving heat source channel, which are matched; and the preheating heat exchanger is provided with a third heat exchange channel and a fourth heat exchange channel which are matched. Part of steam in the steam turbine enters the driving heat source channel from the steam extraction opening and is used as the driving force of the absorption type heat pump, so that circulating work medium is heated in the second heat exchange channel, and cooling water is cooled in the first heat exchange channel. The heated circulating work medium heats air or fuel flowing across the fourth heat exchange channel, so that the temperature of the air or fuel entering the gas turbine is raised.

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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