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Carbon dioxide capture test completes initial phase

World Coal,

A demonstration test for capturing and sequestering carbon dioxide (CO2) from coal-fired power plant emissions has completed an initial demonstration phase. The test is being conducted jointly by Mitisubishi Heavy Industries (MHI) and Southern Company Services (SCS), in Alabama, US.

The success of the initial demonstration phase means that a large-scale capture system for CO2 recovered from coal-fired power plants, which typically emit flue gas containing impurities, is now feasible. Based on this success, MHI now plans to speed up its programme seeking to achieve commercially viable technology for recovering CO2 from coal-fired plants.

CO2 recovery
The demonstration test is an important part of a project focused on achieving recovery of CO2 from coal-fired power plant emissions on a globally unprecedented scale of 500 metric tpd (mtpd). To conduct the test, a demonstration plant for separating and recovering CO2 was constructed at an SCS affiliate’s coal-fired power plant in Alabama.

The test got began in June 2011. After verifying the technology for recovering CO2 from the coal-fired plant flue gas, as well as recovery performance, integrated capture and sequestration demonstration testing began in August 2012. High-performance continuous and stable operation of the large-scale CO2 recovery plant was confirmed.

MHI has served as the CO2 recovery process licensor responsible for basic planning and engineering, supply of the CO2 compressors and other core machinery, and technical support during the demonstration test.

Demonstration plant
The CO2 capture demonstration plant that supplied the CO2 under this project was built jointly by MHI and SCS and is the world's largest in scale. The plant consists of:

  • A flue-gas scrubber;
  • Flue-gas CO2 capture/re-generation system;
  • CO2 compression machinery;
  • Electrical components.

It has capacity to recover 150 000 metric tpa of CO2, with recovery efficiency above 90%. For CO2 recovery the facility adopts the KM CDR Process®, which uses a proprietary KS-1 high-performance solvent for CO2 absorption and desorption that was jointly developed by MHI and the Kansai Electric Power Company. Compared with other CO2 capture technologies, the KM CDR Process uses significantly less energy.

With the performance of the initial demonstration phase complete, SCS and MHI are currently in discussions concerning the performance of additional demonstration phases and activities utilizing the plant.

Adapted from press release by Katie Woodward

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