Gas-steam combined cycle centralized heat supply device and heat supply method

Patent metadata

Field	Value
Publication number	US-10823015-B2
Application number	US-201514910228-A
Country	US
Kind code	B2
Filing date	Sep 10, 2015
Priority date	Jan 8, 2015
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The present invention relates to a gas-steam combined cycle centralized heat supply device and a heat supply method. The gas-steam combined cycle centralized heat supply device comprises a gas-steam combined cycle system connected with a thermal station through a heating network return water heating system; the gas-steam combined cycle system comprises a gas turbine connected with a direct contact type flue gas condensation heat exchanger and a steam turbine via a waste heat boiler; the thermal station comprises a hot water type absorption heat pump and a water-water heat exchanger; the heating network return water heating system comprises a steam type absorption heat pump for recovering flue gas waste heat and a steam-water heat exchanger. The present invention can be widely applied to the industry of power plant waste heat recovery.

First claim

The invention claimed is:

1. A gas-steam combined cycle centralized heat supply device, characterized in that the gas-steam combined cycle centralized heat supply device comprises a gas-steam combined cycle system, a heating network return water heating system, and a thermal station, and the gas-steam combined cycle system is connected with the thermal station through the heating network return water heating system;
wherein the gas-steam combined cycle system comprises a gas turbine, a waste heat boiler, a direct contact type flue gas condensation heat exchanger, and a steam turbine;
the heating network return water heating system comprises a steam type absorption heat pump for recovering flue gas waste heat, a steam-water heat exchanger, and a power plant water-water heat exchanger;
the thermal station comprises a hot water type absorption heat pump and a water-water heat exchanger;
an exhaust port of the gas turbine is connected with a flue gas inlet of the waste heat boiler; a flue gas outlet of the waste heat boiler is connected with a flue gas inlet of the direct contact type flue gas condensation heat exchanger, a steam outlet of the waste heat boiler is connected with an extraction steam inlet of the steam turbine, and a drain water inlet of the waste heat boiler is connected with a drain water outlet of the steam type absorption heat pump for recovering flue gas waste heat and a drain water outlet of the steam-water heat exchanger; a first intermediate medium water inlet and a first intermediate medium water outlet of the direct contact type flue gas condensation heat exchanger are respectively connected to an intermediate medium water outlet and an intermediate medium water inlet of the steam type absorption heat pump for recovering flue gas waste heat, and a second intermediate medium water inlet and a second intermediate medium water outlet of the direct contact type flue gas condensation heat exchanger are respectively connected to an intermediate medium water outlet and an intermediate medium water inlet of the power plant water-water heat exchanger; an extraction steam outlet of the steam turbine is connected to an extraction steam inlet of the steam type absorption heat pump for recovering flue gas waste heat and an extraction steam inlet of the steam-water heat exchanger; and
a heating network water inlet of the power plant water-water heat exchanger is connected with the heating network return water outlet of the hot water type absorption heat pump, and a heating network water outlet of the power plant water-water heat exchanger is connected with a heating network water inlet of the steam type absorption heat pump for recovering flue gas waste heat; a heating network water outlet of the steam type absorption heat pump for recovering flue gas waste heat is connected with a heating network water inlet of the steam-water heat exchanger, and a heating network water outlet of the steam-water heat exchanger is connected with a heating network supply water inlet of the hot water type absorption heat pump; and
the heating network return water outlet and the heating network supply water inlet of the hot water type absorption heat pump are connected to a heating network return water heating system, a heating network supply water outlet of the hot water type absorption heat pump is connected with a heating network supply water inlet of the water-water heat exchanger, and a heating network return water inlet of the hot water type absorption heat pump is connected with a heating network supply water outlet of the water-water heat exchangers;
wherein the heating network return water heating system is coupled with the thermal station via a closed water-cycling circuit which runs through the steam- water heat exchanger, the steam type absorption heat pump, the power plant water- water heat exchanger, the hot water type absorption heat pump, and the water- water heat exchanger, so as to further utilize the waste heat from the steam-water heat exchanger, the steam type absorption heat pump, and the power plant water- water heat exchanger to heat user supply water in the thermal station.

2. The gas-steam combined cycle centralized heat supply device according to claim 1 , characterized in that the heating network return water heating system comprises a condenser; a heating network water outlet of the power plant water-water heat exchanger is connected with a heating network water inlet of the condenser;
a heating network water outlet of the condenser is connected with a heating network water inlet of the steam type absorption heat pump for recovering flue gas waste heat;
a drain water outlet of the steam-water heat exchanger and a drain water outlet of the condenser are connected to the drain water inlet of the waste heat boiler;
an extraction steam inlet of the steam type absorption heat pump for recovering flue gas waste heat and an extraction steam inlet of the steam-water heat exchanger are connected to the extraction steam outlet of the steam turbine; and an exhaust steam inlet of the condenser is connected to an exhaust steam outlet of the steam turbine.

3. The gas-steam combined cycle centralized heat supply device according to claim 1 , characterized in that the heating network return water heating system comprises a condenser;
a heating network water inlet of the condenser is connected with the heating network return water outlet of the hot water type absorption heat pump, a heating network water outlet of the condenser is connected with a heating network water inlet of the power plant water-water heat exchanger;
a drain water outlet of the steam type absorption heat pump for recovering flue gas waste heat, a drain water outlet of the steam-water heat exchanger and a drain water outlet of the condenser are connected to the drain water inlet of the waste heat boiler, and
an extraction steam inlet of the steam type absorption heat pump for recovering flue gas waste heat and an extraction steam inlet of the steam-water heat exchanger are connected to the extraction steam outlet of the steam turbine; and
an exhaust steam inlet of the condenser is connected to an exhaust steam outlet of the steam turbine.

4. The gas-steam combined cycle centralized heat supply device according to claim 1 , characterized in that the heating network return water heating system comprises a condenser; a heating network water inlet of the power plant water-water heat exchanger and a heating network water inlet of the condenser are connected with the heating network return water outlet of the hot water type absorption heat pump;
a heating network water outlet of the power plant water-water heat exchanger and a heating network water outlet of the condenser are connected with a heating network water inlet of the steam type absorption heat pump for recovering flue gas waste heat;
a drain water outlet of the steam type absorption heat pump for recovering flue gas waste heat, a drain water outlet of the steam-water heat exchanger and a drain water outlet of the condenser are connected to the drain water inlet of the waste heat boiler;
an extraction steam inlet of the steam type absorption heat pump for recovering flue gas waste heat and an extraction steam inlet of the steam-water heat exchanger are connected to the extraction steam outlet of the steam turbine; and
an exhaust steam inlet of the condenser is connected to an exhaust steam outlet of the steam turbine.

5. The gas-steam combined cycle centralized heat supply device according to claim 1 , characterized in that the heating network return water heating system comprises a condenser and a steam type absorption heat pump for recovering exhaust steam waste heat;
a heating network water inlet of the steam type absorption heat pump for recovering exhaust steam waste heat is connected

Assignees

• Univ Tsinghua

Inventors

• Fu Lin
• Zhao Xiling
• Li Feng
• Zhang Shigang

Classifications

• F28D21/0014

  the heat being recuperated from waste air or from vapors (for air conditioning F24F12/001) · CPC title

• F01K11/02

  the engines being turbines · CPC title

• F01K23/10 Primary

  with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) · CPC title

• F24D17/0005

  using recuperation of waste heat (F24D17/0036 takes precedence) · CPC title

• F01K17/025 Primary

  in combination with at least one gas turbine, e.g. a combustion gas turbine · CPC title