Abstract
In precombustion decarbonisation, the CO2 is captured before burning the fuel. The method has many parallels to the method of producing hydrogen which is a mature technology. Technology performances are given for gas-based and coal-based processes. The technology comprises three steps: - reforming/conversion of fossil fuel to a mixture containing hydrogen, CO2 and CO; - shifting this mixture to a mixture with CO2 and H2; - separation of CO2 and hydrogen. There are a few development options, like the IRCC (Integrated Reforming Combined Cycle).
Highlights
Precombustion decarbonisation technology is today in commercial operation for different applications, e.g. hydrogen, ammonia and syngas production
– Precombustion decarbonisation (PrCDC) technology has been demonstrated in a large scale application at conditions required for CO2 capture and storage (CCS)
As regards solid fuel based PrCDC the International Energy Agency (IEA) Greenhouse Gas R&D Programme has performed an evaluation (Domenichini, 2003) of IGCC based on two oxygen blow entrained bed gasifiers: – a Texaco slurry feed gasifier, with product gas cooling by water quench; – a Shell dry-feed gasifier, with product gas cooling in a heat recovery boiler
Summary
Precombustion decarbonisation (PrCDC) is a method to capture carbon in the form of CO2 from fossil fuels before burning the fuel in a combustor. The method has many parallels to the method of producing hydrogen and is in some cases designated hydrogen production (with CO2 removal). The basic steps in technology have been used for more than 50 years and are considered to be mature, with little potential for improvements, but for PrCDC, the design requirement changes. Hydrogen is generally produced at high purity for chemical, refining and other uses. For PrCDC one can relax this requirement and cost reduction can be expected. As PrCDC is a new application, the concept needs to be adopted by the technology providers before improvements can be expected
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