System for gas processing

Abstract

A power plant for the generation of electrical energy with a system (1) for processing flue gases resulting from a combustion of fossil fuels comprises, according to the invention, an adiabatic compressor (5) for a first low-pressure compression of the flue gases and a second multi-stage, low-pressure flue gas compression system (14) and a multi-stage, high-pressure CO₂ compression system (15), where both the low-pressure flue gas compression system and the high-pressure CO2 compression systems are combined in one single machine (C2) and are arranged on one common shaft (16) driven by one common driver (17). A heat exchanger (8) facilitates an improved recovery of heat resulting from the cooling of the adiabatically compressed flue gases. The invention allows an improvement of the overall power efficiency of a power plant integrated with this processing system as well as a reduction of investment cost.

Description

TECHNICAL FIELD[0001]The present invention relates to systems for processing gas resulting from fossil fuel fired power plants for the generation of electric energy. It relates in particular to a system for gas processing to purify such gas in order to facilitate the transport and storage of carbon dioxide.BACKGROUND ART[0002]In view of reducing the emission of the greenhouse gas carbon dioxide (CO2) into the atmosphere, the flue gases of fossil fuel fired power plants for the generation of electrical energy are typically equipped with so-called CO2-capture systems. CO2 gases contained in the flue gases is first separated, then compressed, dried, and cooled and thus conditioned for permanent storage or a further use such as enhanced oil recovery. For safe transport, storage or further use, the CO2 is required to have certain qualities. For example, for enhanced oil recovery the gas is to have a CO2 concentration of at least 95%, a temperature of less than 50° C. and a pressure of 13...

AI Technical Summary

Benefits of technology

[0022]In an embodiment, the adiabatic flue gas compressor discharge pressure can be set to 7 to 9 bar abs. Above this pressure range the adiabatic compression would require more power consumption than the compression in an intercooled centrifugal compressor. With this discharge pressure the temperature at the discharge of the adiabatic compressor is in the range from 170 to 280° C. This allows an efficient heat recovery for instance by heating condensates from the power plant steam/water cycle through the use of a dedicated heat exchanger.

[0023]After the heat recovery, the flue gas is at a temperature of about 50° C. It is then further cooled in a second exchanger, where heat is dissipated. It is then compressed to 30 to 40 bar abs by two stages of

Problems solved by technology

The removal of contaminants from flue gases is not limited by technical barriers but rather by the ad

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