![]() Various challenges had to be overcome to build the pilot plant. ![]() Although the technology is not new, it needed to be adapted to the specific needs of power plants, which is why RWE Power partnered with BASF and Linde. Drawing on its bundled know-how in chemical plant engineering and over fifty years' experience in gas wash, this division is actively progressing CO 2 scrubbing. This is flanked by extensive engineering expertise in hydrogen, synthesis gas and olefin plants. Linde's Engineering Division is successful worldwide thanks to its core competence in complex, high-tech natural gas liquefaction and air separation plants. The principle behind the post-combustion method Once captured, the CO 2 can be stored underground. With extraction efficiency rates in excess of 90 percent, CO 2 scrubbing dramatically reduces combustion gas emissions from power plants. The company aims to bring CO 2 capture to commercial readiness for lignite plants by 2020. ![]() Since summer 2009, energy provider RWE Power has been piloting this process at its lignite power plant in Niederaussem. This CO 2 scrubbing process is the only method suitable for retrofitting existing power plants. The liquid is then cooled and fed back to the absorber, where the wash cycle can begin again. The CO 2-saturated scrubbing agent is fed to a desorber where it is heated. It is then released into the atmosphere via a stack or cooling tower. The low-CO 2 flue gas is showered with water before leaving the absorber to remove any traces of the scrubbing agent. This watery solution of amines – organic compounds – extracts the CO 2 from the flue gas. This is where the previously desulphurised flue gas comes in counter-flow contact with a scrubbing agent. To reduce carbon emissions, the CO 2 scrubbing process is applied downstream of conventional flue gas purification systems.Īt the heart of a CO 2 scrubbing plant – also known as post-combustion capture (PCC) – is an absorber. Scrubbing can also be useful for a coal-fired power plant as it removes CO 2 from the flue gas. For many years now, the chemical industry has been using CO 2 scrubbing to recover CO 2 generated as a by-product of production processes.
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