Combined cycle power plant with co2 capture and method to operate it

Inactive Publication Date: 2013-10-17
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a combined cycle power plant that has a CO2 capture plant that has increased efficiency in capturing CO2 compared to previous power plants of this type. The invention also provides a method to operate the power plant that decreases operating costs.

Problems solved by technology

Most importantly, the operation of a CO2 capture facility in connection with a fossil fuel fired power plant results in a considerable drop of the overall efficiency of the plant due to the heat consumption, typically in the form of extracted steam, and auxiliary power required to operate the CO2 capture plant.
It is also known that the concentration of oxygen in the flue gas affects the operation of the CO2 capture plant as oxygen may cause degradation of the absorbing solution, which can result in an increase in CO2 capture plant operation and maintenance costs.

Method used

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  • Combined cycle power plant with co2 capture and method to operate it
  • Combined cycle power plant with co2 capture and method to operate it
  • Combined cycle power plant with co2 capture and method to operate it

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Embodiment Construction

[0054]A power plant 30 for the generation of electricity according to the invention as shown in FIGS. 2-7 comprises essentially a first and second unit 30a and 30b, where unit 30a comprises a combined cycle power plant with a gas turbine compressor 31, combustion chamber 32, and gas turbine 33 driving a generator. An exhaust gas line 34, 35 directs gas exhausted by the gas turbine to a first HRSG 36, where it is used for steam generation and subsequently led through a flue gas line 37 directing the exhaust gases to a stack 38.

[0055]Steam generated in the first HRSG is led via a live steam line 40 to a steam turbine 39, which in turn drives a further generator. The steam exhausted by steam turbine 39 is led into a condenser 39′ and resulting condensate is directed into the HRSG 36 via line 39a for the generation of steam, thereby completing the water steam cycle.

[0056]Unit 30b of the power plant 30 mainly comprises a second HRSG 43, which is operated with hot exhaust gases from unit ...

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Abstract

A combined cycle power plant with a gas turbine, steam turbine, and first HRSG comprises a CO2 capture plant for the at least partial capture of CO2 from the exhaust gases from the gas turbine. It comprises in particular a second HRSG or boiler arranged to receive a portion of the exhaust gases and transfer its heat to steam and feedwater. Steam generated in the second HRSG or boiler is used for the operation of the CO2 capture plant and / or to operate a steam turbine that drives a generator and optionally a CO2 compressor. The power plant according to the invention allows for greater flexibility in power plant part load control and power plant efficiency. A method to operate the power plant is also claimed.

Description

TECHNICAL FIELD[0001]The present invention pertains to a combined cycle power plant for the generation of electrical power comprising a gas turbine, a steam turbine, a heat recovery steam generator, and a plant integrated in the power plant for the capture and compression of carbon dioxide in the flue gases of the gas turbine. It furthermore pertains to a method of operating the power plant.BACKGROUND ART[0002]Combined cycle power plants with carbon dioxide (CO2) capture are well known in the literature and have been realized in first pilot power plants, for example in the USA and Sweden.[0003]Known concepts for such power plant with carbon capture plants include a combined cycle power plant with a gas and steam turbine and a heat recovery steam generator (HRSG) designed to generate steam using the heat from the gas turbine flue gases. The flue gases exhausted by such HRSGs typically contain CO2 only up to about 4% of volume flow. CO2 capture plants have been proposed that capture t...

Claims

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Application Information

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IPC IPC(8): F01K23/10
CPCF01K17/04Y02E20/16F02C6/18F01K23/10Y02E20/32
InventorLI, HONGTAODROUX, FRANCOISRUCHTI, CHRISTOPHREYSER, KARL
OwnerALSTOM TECH LTD