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Gas supercritical carbon dioxide combined cycle power generation system based on LNG cold source and operation method

A combined cycle power generation, carbon dioxide technology, used in turbine/propulsion fuel delivery systems, charging systems, gas turbine installations, etc.

Pending Publication Date: 2020-10-23
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few studies on supercritical carbon dioxide power cycle recovery of gas turbine exhaust heat and utilization of fuel LNG cold energy to generate electricity, so more in-depth research is needed

Method used

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  • Gas supercritical carbon dioxide combined cycle power generation system based on LNG cold source and operation method

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Embodiment Construction

[0026] The present invention is described in further detail below in conjunction with embodiment.

[0027] like figure 1 As shown, a gas-fired supercritical carbon dioxide combined cycle power generation system based on LNG cold source, including a gas turbine power generation system, a supercritical carbon dioxide power generation system and a bottom cycle power generation system;

[0028] The gas turbine power generation system is composed of a compressor 1, a combustion chamber 2 and a gas turbine 3 connected in sequence;

[0029] The supercritical carbon dioxide power generation system includes a first main compressor 6, an outlet of the first main compressor 6, an inlet and outlet of the second precooler 7, an inlet and outlet of the second main compressor 8, and a low-temperature regenerator 9 Cold side inlet and outlet, high temperature regenerator 10 cold side inlet and outlet, high temperature heat exchanger 4 inlet and outlet, turbine 11 inlet and outlet, high tempe...

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Abstract

The invention discloses a gas supercritical carbon dioxide combined cycle power generation system based on an LNG cold source and an operation method. The system comprises a gas turbine power generation system, a supercritical carbon dioxide power generation system and a bottom cycle power generation system, wherein the cold end of the supercritical carbon dioxide power generation system can improve the cycle efficiency through an interstage cooling mode, and meanwhile, reduces the temperature of a working medium at an outlet of a compressor, and is used for completely recycling exhaust smokewaste heat of a gas turbine; and the bottom cycle power generation system generates power by recycling the cold source loss of the supercritical carbon dioxide power generation system and cold energyof fuel LNG of the gas turbine power generation system. According to the gas supercritical carbon dioxide combined cycle power generation system, energy quality-divided gradient utilization is achieved, the energy utilization rate can be greatly increased, and therefore the power generation efficiency of the system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of power generation, in particular to a gas supercritical carbon dioxide combined cycle power generation system and an operation method based on an LNG cold source. Background technique [0002] At present, the gas-steam combined cycle power generation system is developing rapidly in China due to its advantages of high power generation efficiency, flexible operation and low environmental pollution. The exhaust gas temperature of the gas turbine is relatively high, generally between 450°C and 600°C, and carries a large amount of available heat. If the exhaust gas is directly discharged into the environment, it will cause a large amount of energy loss. The power generation efficiency of the system can be greatly improved by coupling the steam Rankine cycle to recover the exhaust heat of the gas turbine. The thermal efficiency of gas turbine single-cycle power generation system is generally 20% to 42%, while t...

Claims

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Application Information

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IPC IPC(8): F02C6/00F02C3/22F02C7/22F01K23/10F01K23/02F01K25/10F01K25/08F01K19/04
CPCF02C6/00F02C3/22F02C7/22F01K23/10F01K23/02F01K25/103F01K25/08F01K19/04Y02E20/16
Inventor 张旭伟乔永强张纯韩万龙李红智张一帆姚明宇
Owner XIAN THERMAL POWER RES INST CO LTD
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