Oxygen gasifier

Reed, T. B., Levie, B., and Markson, M. (1984). The SERI Oxygen Gasifier-Phase 11, SERl/PR/ 234-2571. Golden, CO, August. 

At Beijing Tsinghua University, the two-stage oxygen gasifier has been developed. The slurry-fed downflow refractory-fined pressurized (40-65 bar) system features one top-central burner in which an atomization gas (e.g., CO2, N2, CH4)... 

The Winkler gasifier (Fig. 5) is an example of a medium heat-value gas producer which, when oxygen is employed, yields a gas product composed mainly of carbon monoxide and hydrogen (43). 

The first coimneicial fluidized-bed systems used WinMei units in which lignite and its chat are gasified at atmospheric pressure with ait or oxygen... 

A medium heat (11.2 MJ/m (300 Btu/ft )) gas for iadustrial appHcation has been produced at Westiaghouse Electric s pilot plant ia Waltz Mill, Pennsylvania (50), where lignite is gasified ia a pressurized fluidized bed which uses oxygen and steam. 

Sasol Fischer-Tropsch Process. 1-Propanol is one of the products from Sasol s Fischer-Tropsch process (7). Coal (qv) is gasified ia Lurgi reactors to produce synthesis gas (H2/CO). After separation from gas Hquids and purification, the synthesis gas is fed iato the Sasol Synthol plant where it is entrained with a powdered iron-based catalyst within the fluid-bed reactors. The exothermic Fischer-Tropsch reaction produces a mixture of hydrocarbons (qv) and oxygenates. The condensation products from the process consist of hydrocarbon Hquids and an aqueous stream that contains a mixture of ketones (qv) and alcohols. The ketones and alcohols are recovered and most of the alcohols are used for the blending of high octane gasoline. Some of the alcohol streams are further purified by distillation to yield pure 1-propanol and ethanol ia a multiunit plant, which has a total capacity of 25,000-30,000 t/yr (see Coal conversion processes, gasification). 

Still another process, called BI-GAS, was developed by Bituminous Coal Research in a 73 t/d pilot plant in Homer City, Peimsylvania. In this entrained-bed process, pulverized coal slurry was dried and blown into the second stage of the gasifier to contact 1205°C gases at ca 6.9 MPa (1000 psi) for a few seconds residence time. Unreacted char is separated and recycled to the first stage to react with oxygen and steam at ca 1650°C to produce hot gas and molten slag that is tapped. 

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