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System and method for improving efficiency of combined cycle electric power plant

A technology of combined cycle and high efficiency, which is applied in the direction of charging system, combined combustion mitigation, turbine/propellant fuel delivery system, etc., and can solve the problems of heat waste, large exhaust gas flow of waste heat boiler, and exhaust waste heat that is not recycled.

Inactive Publication Date: 2006-02-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste heat boiler in the combined cycle generator set has a large exhaust gas flow, which is discharged into the atmosphere through the chimney, resulting in a huge waste of heat
These systems also do not recycle this part of the exhaust heat

Method used

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  • System and method for improving efficiency of combined cycle electric power plant
  • System and method for improving efficiency of combined cycle electric power plant

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Experimental program
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Embodiment Construction

[0026] Such as figure 1 As shown, its system mainly includes:

[0027] LNG supply line, storage tank 13, booster pump 12, gasifier 11, preheater 19, condensate pump 18, condenser 8, steam turbine 7, second generator 6, waste heat boiler 5, gas turbine 4, Combustion chamber 3, compressor 2, first generator 1, condensing heat exchanger 14, heat exchange fluid pump 15;

[0028] Wherein the first generator 1, the compressor 2, the combustion chamber 3 and the gas turbine 4 and the second generator 6, the waste heat boiler 5, the condenser 8 and the steam turbine 7 constitute the power output;

[0029] A booster pump 12 is connected downstream of the storage tank 13 connected to the liquefied natural gas supply line, and the booster pump 12 communicates with the vaporizer 11 that is in a heat exchange relationship with the condenser 8, and the heat exchange fluid flows between the vaporizer 11 and the condensing steam There is a heat exchange fluid pump 15 between the tanks 8, an...

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Abstract

This invention relates to a system and method for increasing the efficiency of association circulating power plant, wherein the power plant uses liquefied natural gas as the fuel. The method comprises the following steps: a) passing the heat of steam turbine exhaust to LNG through heat transfer fluid; b) gasifying LNG, using the cool energy arising form gasifying to condense the exhaust to condensation water; c) decreasing the pressure at expulsion of the steam turbine, improving the output power and efficiency of the steam turbine. The condensation water will mix with the cool water, absorbing the sensible heat in the exhaust-heat boiler smoke discharging and the hidden heat in the steam, decreasing the smoke discharging temperature below dew-point temperature. One part of the water which has recovered the smoke after heat will be used as the water supply for the exhaust-heat boiler, the other will be used for heating natural gas, improving the temperature of the natural gas entry to the burning room.

Description

technical field [0001] The invention relates to a system and method for improving the efficiency of a gas-steam combined cycle power plant, especially for a combined cycle power plant using liquefied natural gas (LNG) as the main fuel. This system and method utilizes the cold energy released in the LNG gasification process to condense the exhaust steam of the steam turbine into condensed water close to the freezing point, thus improving the efficiency and power of the steam turbine; The latent heat is used to heat the condensed water and the gasified LNG, thereby improving the efficiency of the gas turbine. Background technique [0002] The basic principle of gas-steam combined cycle power generation is: the high-temperature exhaust gas that has done work in the gas turbine is sent to the waste heat boiler to generate water steam, and then the water steam is introduced into the steam turbine to do work, and the exhaust steam of the steam turbine is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02C6/18F02C7/224
CPCY02E20/16
Inventor 车得福史晓军
Owner XI AN JIAOTONG UNIV
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