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 CO 2 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 (C 2 ) 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.

1 . A system for processing flue gases from a fossil fuel fired power plant for the generation of electrical energy comprising:
 an adiabatic compressor for a first low-pressure compression of the flue gas;   a second low-pressure compression system having one or more stages and one or more coolers; and   a high-pressure compression system having several stages and one or more coolers, where both the second low-pressure compression system and the high-pressure compression system are combined in one single machine, and arranged on one common shaft, and driven by one common driver.   
     
     
         2 . The system according to  claim 1 , further comprising
 a unit for cryogenic purification of the flue gases by removal of inert gases from the flue gas, where the unit for cryogenic purification is arranged downstream of the second low-pressure compression system and upstream of the high-pressure compression system.   
     
     
         3 . The system according to  claim 1 , further comprising
 a dehydration unit arranged downstream of the second low-pressure compression system.   
     
     
         4 . The system according to  claim 1 , wherein
 the system comprises two low-pressure compressor stages and four to six high-pressure compressor stages arranged on one single shaft.   
     
     
         5 . The system according to  claim 1 , further comprising
 a heat exchanger arranged downstream from the adiabatic compressor.   
     
     
         6 . The system according to  claim 1 , further comprising a
 heat exchanger configured for heat exchange with a water flow system for heat recovery.   
     
     
         7 . The system according to  claim 1 , further comprising a heat exchanger configured for heat exchange with a water flow system for heat recovery where
 the water flow system is part of a water/steam cycle of a steam turbine power plant.   
     
     
         8 . The system according to  claim 1 , further comprising a
 water flow system is connected to a condensate extraction pump.   
     
     
         9 . The system according to  claim 1 , wherein
 the adiabatic compressor is configured for a discharge pressure of the flue gases of a pressure in a range from 5 bar abs to 20 bar abs.   
     
     
         10 . The system according to  claim 1 , wherein
 the adiabatic compressor is configured for a discharge pressure of the flue gases of a pressure in a range from 7 bar abs to 9 bar abs.   
     
     
         11 . The system according to  claim 1 , wherein
 the adiabatic compressor and low-pressure compression system are configured such that a ratio of a discharge pressure of the adiabatic compressor to a discharge pressure of a first stage of the low-pressure compression system is in a range from 1.5 to 2.5.   
     
     
         12 . The system according to  claim 1 , further comprising
 a first line for low-pressure purified CO 2  gas which leads from a cryogenic purification unit to a first inlet of the high-pressure compression system, and a second line for medium-pressure purified CO 2  gas which leads from the cryogenic purification unit to an intermediate stage of the high-pressure compression system.   
     
     
         13 . The system according to  claim 1 , further comprising
 a system for the removal or reduction of SOx and NOx arranged either in a low-pressure flue gas treatment system upstream of the flue gas compression systems or after the adiabatic compressor.   
     
     
         14 . The system according to  claim 1 , wherein
 the system is integrated with a power plant fired by gas, coal, oxyfired coal, or a gas turbine power plant with a facility for post-combustion CO 2 -capture.