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Zero emission coal power, a new concept.

DE2001780367

Publication Date	2001
Personal Author	Ziock, H. J.; Lackner, K. S.; Harrison, D. P.
Page Count	10
Abstract	The Zero Emission Coal Alliance (ZECA) is developing an integrated zero emission process that generates clean energy carriers (electricity or hydrogen) from coal. The process exothermically gasifies coal using hydrogen to produce a methane rich intermediate state. The methane is subsequently reformed using water and a CaO based sorbent. The sorbent supplies the energy needed to drive the reforming reaction and simultaneously removes the generated CO(sub 2) by producing CaCO(sub 3). The resulting hydrogen product stream is split, approximately 1/2 going to gasify the next unit of coal, and the other half being the product. This product stream could then be split a second time, part being cleaned up with a high temperature hydrogen separation membrane to produce pure hydrogen, and the remainder used to generate electricity via a solid oxide fuel cell (SOFC). The inevitable high temperature waste heat produced by the SOFC would in turn be used to regenerate the CaO by calcining the CaCO(sub 3) product of the reforming stage thereby generating a pure stream of CO(sub 2). The CO(sub 2) will be dealt with a mineral sequestration process discussed in other papers presented at this conference. The SOFC has the added advantage of doubling as an oxygen separation membrane, thereby keeping its exhaust stream, which is predominantly steam, free of any air. This exhaust stream is largely recycled back to the reforming stage to generate more hydrogen, with a slipstream being extracted and condensed. The slipstream carries with it the other initial contaminants present in the starting coal. Overall the process is effectively closed loop with zero gaseous emissions to the atmosphere. The process also achieves very high conversion efficiency from coal energy to electrical energy ((approximately) 70%) and naturally generates a pure stream of CO(sub 2) ready for disposal via the mineral sequestration process.
Keywords	Coal Environmental protection Efficiency Electricity Hydrogen Membranes Methane Oxygen Solid electrolyte fuel cells Steam Waste heat
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	97K - Fuels 97R - Environmental Studies
Corporate Authors	Department of Energy, Washington, DC.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	W-7405-ENG-36

Zero emission coal power, a new concept.

Zero emission coal power, a new concept.
DE2001780367

Publication Date	2001
Personal Author	Ziock, H. J.; Lackner, K. S.; Harrison, D. P.
Page Count	10
Abstract	The Zero Emission Coal Alliance (ZECA) is developing an integrated zero emission process that generates clean energy carriers (electricity or hydrogen) from coal. The process exothermically gasifies coal using hydrogen to produce a methane rich intermediate state. The methane is subsequently reformed using water and a CaO based sorbent. The sorbent supplies the energy needed to drive the reforming reaction and simultaneously removes the generated CO(sub 2) by producing CaCO(sub 3). The resulting hydrogen product stream is split, approximately 1/2 going to gasify the next unit of coal, and the other half being the product. This product stream could then be split a second time, part being cleaned up with a high temperature hydrogen separation membrane to produce pure hydrogen, and the remainder used to generate electricity via a solid oxide fuel cell (SOFC). The inevitable high temperature waste heat produced by the SOFC would in turn be used to regenerate the CaO by calcining the CaCO(sub 3) product of the reforming stage thereby generating a pure stream of CO(sub 2). The CO(sub 2) will be dealt with a mineral sequestration process discussed in other papers presented at this conference. The SOFC has the added advantage of doubling as an oxygen separation membrane, thereby keeping its exhaust stream, which is predominantly steam, free of any air. This exhaust stream is largely recycled back to the reforming stage to generate more hydrogen, with a slipstream being extracted and condensed. The slipstream carries with it the other initial contaminants present in the starting coal. Overall the process is effectively closed loop with zero gaseous emissions to the atmosphere. The process also achieves very high conversion efficiency from coal energy to electrical energy ((approximately) 70%) and naturally generates a pure stream of CO(sub 2) ready for disposal via the mineral sequestration process.
Keywords	Coal Environmental protection Efficiency Electricity Hydrogen Membranes Methane Oxygen Solid electrolyte fuel cells Steam Waste heat
Source Agency	Technical Information Center Oak Ridge Tennessee
NTIS Subject Category	97K - Fuels 97R - Environmental Studies
Corporate Authors	Department of Energy, Washington, DC.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	W-7405-ENG-36