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Supercritical fluid and gas turbine combined cycle system

A technology of supercritical fluid and gas turbine, which is applied in the direction of gas turbine devices, combined combustion mitigation, mechanical equipment, etc., and can solve problems such as heat waste, emissions, exhaust gas utilization and treatment without gas turbines, etc.

Pending Publication Date: 2022-04-12
刘慕华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the combined cycle scheme of the prior art, the tail gas of the gas turbine is not utilized and treated, but is directly discharged into the atmosphere, resulting in waste of heat

Method used

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  • Supercritical fluid and gas turbine combined cycle system
  • Supercritical fluid and gas turbine combined cycle system
  • Supercritical fluid and gas turbine combined cycle system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 supercritical fluid and gas turbine combined cycle system

[0057] Comprising a gas turbine subsystem 1 and a supercritical fluid circulation subsystem 2, the gas turbine subsystem 1 and the supercritical fluid circulation subsystem 2 are independent of each other; the gas turbine subsystem 1 includes a first compressor 3, a combustion chamber 4, and a first turbine 5 and the first generator 6, the supercritical fluid circulation subsystem 2 includes a rotor system, a first heat exchanger 7 and a second heat exchanger 8; wherein,

[0058] The first compressor 3, the first turbine 5 and the first generator 6 in the gas turbine subsystem 1 are arranged coaxially, the exhaust end of the first compressor 3 communicates with the intake end of the combustion chamber 4, and the combustion chamber 4 The outlet end of the first turbine 5 is communicated with the intake end of the first turbine 5, and the outlet end of the first turbine 5 is communicated with the inl...

Embodiment 2

[0072] Embodiment 2 Control method of supercritical fluid and gas turbine combined cycle system

[0073] include:

[0074] The first generator in the gas turbine subsystem is switched to work in motor mode, and the first turbine is driven to rotate until the speed of the first compressor reaches a preset speed, and the pressure ratio reaches a preset pressure ratio (for example, 3 to 4 times the pressure ratio); Then control the first generator to switch to the power generation mode; the exhaust gas of the first turbine enters the first heat exchanger for heat exchange;

[0075]The second generator in the supercritical fluid circulation subsystem is switched to the motor mode, and the second turbine is driven to rotate until the second compressor can output supercritical fluid with a predetermined pressure ratio (for example, 2 to 3 times the pressure ratio); then control The second generator is switched to the power generation working mode.

Embodiment 3

[0076] Embodiment 3 supercritical fluid and gas turbine combined cycle system

[0077] The structure is the same as in Embodiment 1. The structure of the rotor system of the supercritical fluid circulation subsystem is as follows: comprising a rotating shaft 100, on which the first radial bearing 500, the first thrust bearing 700, the generator A 400, and the second compressed air Machine 300, second radial bearing 600, second turbine 200, generator B, second thrust bearing and third radial bearing, such as image 3 , 4 shown.

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Abstract

The invention discloses a supercritical fluid and gas turbine combined cycle system which comprises a gas turbine subsystem and a supercritical fluid circulation subsystem, the gas turbine subsystem and the supercritical fluid circulation subsystem are mutually independent, and the gas turbine subsystem comprises a first gas compressor, a combustion chamber, a first turbine and a first generator. The supercritical fluid circulation subsystem comprises a rotor system, a first heat exchanger and a second heat exchanger. Tail gas waste heat of the gas turbine subsystem can be used for heating the supercritical fluid so as to improve the expansion acting performance of the supercritical fluid, then combined circulation of the gas turbine and the supercritical fluid is achieved, and the heat efficiency of the gas turbine system is improved. The high-temperature supercritical fluid discharged from the turbine is drained to the second heat exchanger for heat exchange through the flow guide cover, so that the supercritical fluid is cooled before entering the gas compressor, the gas compression effect of the gas compressor is improved, and the overall efficiency of the system is improved.

Description

technical field [0001] The invention relates to a combined cycle system of a supercritical fluid and a gas turbine, belonging to the technical field of supercritical fluid. Background technique [0002] Supercritical fluids (such as supercritical carbon dioxide SCCO 2 ) has special physical and chemical properties and is applicable to various technical fields, for example, it can be used as a dry cleaning solvent for preparing micron or nanoscale particles; in addition, based on the very high thermal efficiency (about 45%) of supercritical fluid, it can also be used cycle, or for closed gas turbines (such as the Brayton energy cycle), this high efficiency can not only increase the fuel utilization rate of each power generation unit to 40% or more, but compared with the conventional Rankine steam cycle, It can also reduce the cost of the power plant by about 18%. [0003] Documents in the prior art have disclosed the scheme of gas turbine combined with supercritical fluid c...

Claims

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Application Information

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IPC IPC(8): F02C6/18F02C3/04F02C7/06F01K7/32F01D15/10F01D25/10
CPCY02E20/16
Inventor 靳普
Owner 刘慕华