The Wabash River Coal Gasification Repowering Project: a 262 MWe commercial scale integrated gasification combined cycle power plant

Original publisher: [Washington, D.C.? : Clean Coal Technology Program, 1996] OCLC Number: ocm38843688 Subject: Coal gasification -- Industrial applications -- Indiana. Excerpt: ... Process Description Destec Coal Gasification in parallel convection heat exchangers, the condensate contains NH and some of 3 producing high pressure ( 1600 psia ) sat-the H S and CO. The condensate is sent to 2 2 The Destec two-stage coal gasification urated steam. water treatment. technology features an oxygen-blown, The cooled syngas flows to the acid gas entrained flow, continuous slagging, refrac-removal absorber column where H S is re-2 Gas Cleanup tory lined gasifier. The first stage operates moved by a solvent, methyldiethanol amine at about 2,500 ° F and 400 psia. The actual Gas cleanup equipment in an IGCC ( MDEA ), to produce clean syngas. The operating temperature depends upon the power plant is relatively inexpensive com-solvent plus H S and some of the CO flows 2 2 specific coal used. A 60 / 40 weight percent pared to flue gas cleanup in a conventional to the H S stripper where the pressure is 2 coal / water slurry is combined with oxygen coal-steam power plant. Smaller equipment reduced and steam stripping removes the and injected into the gasifier. The coal un-is required because a much smaller volume gases, which then flow to the sulfur recov-dergoes partial combustion, releasing heat of gas is cleaned. ery system. The " lean " amine is recycled. that causes the coal gasification reactions to The gas volume is smaller because the proceed very rapidly and the ash to melt and coal gas is still pressurized before cleaning Sulfur Recovery flow. and subsequent combustion. In contrast, the The molten ash exits through a taphole at volume of flue gas from a coal-steam power In a series of catalytic stages, a Claus the bottom of the first stage into a water plant is greater because the fuel has been sulfur recovery unit converts H S removed 2 quench, forming an inert vitre...