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By Abello T.P.

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AGR unit—Separates and concentrates H2S in the syngas for feed to a Claus unit. 4. Claus unit—Produces S from syngas H2S concentrate. PSA unit—Used to purify a H2 syngas stream of specific desired impurities through the use of absorbents. The gas purity of the H2 produced is determined by factors such as which absorbents are used. 6. Fischer–Tropsch synthesis8—Uses a catalyst to react syngas at high temperatures (330 to 350°C) and pressures (25 bars), or low temperatures (180 to 250°C) and high pressures (45 bars), producing different straight-chain hydrocarbons that range from methane to high molecular weight waxes, according to the reaction CO + 2 H2 → –[CH2]– + H2O.

The formation of hexavalent chrome during a coal or petcoke slagging gasifier operation, however, has not been reported and is not known to occur. In an air-cooled slagging gasifier, zoning (the use of different refractory materials at different locations in a furnace) is practiced because of different wear mechanisms and wear rates at different locations in the gasifier, and because of high material costs. 4), with lower chrome oxide content found in the low-wear areas and higher chrome oxide content (approaching 95%) found in the higher-wear locations.

The refractory materials in each layer depend on the gasifier design, location in the gasifier, gasification temperature and atmosphere, and carbon feedstock. The main purpose of a lining is to protect the high-pressure steel shell from syngas and other gasification gases, elevated temperature, particulate abrasion, and slag corrosion. Any material in a gasifier must be thermodynamically stable to hot gases such as H2, CO, CO2, H2O, and H2S. If ash is liquefied in a gasifier, varying ash chemistry, the quantity of slag generated, and the number of components in it makes the use of phase diagrams to determine refractory stability of limited value.

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Absorption of Ultra-Sonic Waves by Hydrogen and Carbon Dioxide by Abello T.P.

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