Gasification

Shell Coal Gasification Process (SCGP) and Prenflo Process

The origin of both these processes goes back to the Koppers-Totzek process. Shell and Koppers jointly developed a pressurized version of the process, and in 1978 they started to operate a 150 t/d gasifier in Harburg, Germany. The main interest for Koppers was to have a better process available for the production of syngas. For Shell the main interest was at the time the production of synthetic fuels from coal by the route gasification and Fischer-Tropsch synthesis. After the joint Harburg unit, Koppers and Shell decided to develop the process further along separate routes. Subsequently, Shell built a 250 t/d demonstration unit in Houston, and Krupp - Koppers a 48 t/d unit in Fiirstenhausen, Germany. Based on the work in these units, two commercial plants were built as part of IGCC power station. In 1994 a 2000 t/d Shell gasification unit was built for Demkolec in Buggenum in The Netherlands using internationally traded coal as original feedstock, and in 1997 Krupp-Koppers built a 3000 t/d Prenflo unit for Elcogas in Puertollano in Spain using a blend of high-ash coal and petcoke as feedstock. Currently, Shell has various projects under­way in China.

Gasification

Liquid Wastes

Organic Chemical Waste. Organic wastes from chemical production vary as widely as the processes from which they originate. One published example is the feedstock to a waste gasification plant at …

Carbon Management

In the Texaco process, soot is extracted from the carbon-water mixture with naphtha and recycled with the feedstock to the reactor where it is gasified to extinction. The black water …

Common Issues

Operating Temperature Any fluid bed depends on having the solid particles of a size that can be lifted by the upward flowing gas. A large portion (over 95%) of the …

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