Gas steam combined cycle central heating device and heating method

Abstract

The invention relates to a gas steam combined cycle central heating device and heating method. The device comprises a gas steam combined cycle system, a heat supply network backwater heating system and a thermal station, and the gas steam combined cycle system is connected with the thermal station through the heat supply network backwater heating system; the gas steam combined cycle system comprises a gas turbine, a waste heat boiler, a direct contact flue gas condensing heat exchanger and a steam turbine; the gas turbine is connected with the waste heat boiler, and the waste heat boiler is connected with the direct contact flue gas condensing heat exchanger and the steam turbine; the thermal station comprises a hot water absorption heat pump and a water-water heat exchanger; the heat supply network backwater heating system comprises a steam absorption heat pump used for recovering flue gas waste heat and a steam-water heat exchanger; the steam absorption heat pump used for recovering the flue gas waste heat is connected with the steam-water heat exchanger, the direct contact flue gas condensing heat exchanger, the waste heat boiler, the steam turbine and the thermal station, and the steam-water heat exchanger is connected with the waste heat boiler, the steam turbine and the thermal station. The gas steam combined cycle central heating device and heating method can be widely applied to the industry of recycling waste heat of power plants.

Description

technical field [0001] The invention relates to a heat supply device and a heat supply method, in particular to a gas-steam combined cycle centralized heat supply device and a heat supply method. Background technique [0002] Gas-fired cogeneration is a form of energy utilization that produces heat and electricity at the same time. It uses high-grade heat energy for power generation and low-grade heat energy for heating, which not only improves energy utilization efficiency, but also reduces environmental pollution. Natural gas is a clean energy with high calorific value, and the greenhouse gases and other harmful substances produced during combustion are far less than other fossil energy sources. Therefore, natural gas combined heat and power has great application value in reducing carbon and air pollution emissions. . [0003] The current gas-steam combined cycle heat and power cogeneration is mainly composed of gas-steam combined cycle (gas turbine, waste heat boiler, st...

AI Technical Summary

Problems solved by technology

The main problems of the current gas-fired cogeneration central heating device are: (1) The heat-to-power ratio is low

A low heat-to-power ratio means low heating efficiency. In order to meet the heating load, a large amount of natural gas needs to be consumed, which will not only cause environmental pollution, but also affect the safety of heating supply

(2) Large energy loss

(3) Environmental protection and landscape effects are poor

As mentioned above, a large amount of gas consumption will inevitably cause a large amount of pollutants to be discharged. In addition, a large amount of water vapor contained in the flue gas causes the scene of "white smoke" from the chimney, and the environmental pollution and landscape effect are poor.

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