FIVE in Visual C#

Scanning Code 128 Code Set A in Visual C# FIVE

CHAPTER FIVE
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The molten salt system employs a bath of molten salt to convert coal (Cover et al, 1973; Howard-Smith and Werner, 1976; Koh et al, 1978) Fixed-Bed Processes The Lurgi Process The Lurgi process was developed in Germany before World War II and is a process that is adequately suited for large-scale commercial production of synthetic natural (Verma, 1978) The older Lurgi process uses a dry ash gasifier (Fig 514) which differs significantly from the more recently developed slagging process (Baughman, 1978; Massey, 1979) The dry ash Lurgi gasifier is a pressurized vertical kiln which accepts crushed [ 1 in (6 44 mm)] noncaking coal and reacts the moving bed of coal with steam and either air
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Coal
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Coal lock Wash water Jacket steam Coal distributor drive
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Coal distributor Wash cooler Drying zone Devolatilisation zone Gasification zone Combustion zone Grate Grate drive Steam + oxygen Water jacket Crude gas
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Ash lock
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FIGURE 514 The Lurgi dry-ash gasifier
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FUELS FROM COAL
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or oxygen The coal is gasified at 350 to 450 psi (24 31 MPa) and devolatilization takes place in the temperature range 615 to 760 C (1139 1400 F); residence time in the reactor is approximately 1 hour Hydrogen is supplied by injected steam and the necessary heat is supplied by the combustion of a portion of the product char The revolving grate, located at the bottom of the gasifier supports the bed of coal, removes the ash, and allows steam and oxygen (or air) to be introduced The Lurgi product gas has high methane content relative to the products from nonpressurized gasifiers With oxygen injection, the gas has a heat content of approximately 450 Btu/ft3 (168 MJ/m3) The crude gas which leaves the gasifier contains tar, oil, phenols, ammonia, coal fines, and ash particles The steam is first quenched to remove the tar and oil and, prior to methanation, part of the gas passes through a shift converter and is then washed to remove naphtha and unsaturated hydrocarbons; a subsequent step removes the acid gases The gas is then methanated to produce a high heat-content pipeline quality product The Wellman Galusha Process The Wellman Galusha process has been in commercial use for more than 50 years (Howard-Smith and Werner, 1976) These are two types of gasifiers, the standard type and the agitated type and the rated capacity of an agitated unit may be 25 percent (or more) higher than that of a standard gasifier of the same size In addition, an agitated gasifier is capable of treating volatile caking bituminous coals The gasifier is water-jacketed and, therefore, the inner wall of the vessel does not require a refractory lining Agitated units include a varying speed revolving horizontal arm which also spirals vertically below the surface of the coal bed to minimize channeling and to provide a uniform bed for gasification A rotating grate is located at the bottom of the gasifier to remove the ash from the bed uniformly Steam and oxygen are injected at the bottom of the bed through tuyeres Crushed coal is fed to the gasifier through a lock hopper and vertical feed pipes The fuel valves are operated so as to maintain a relatively constant flow of coal to the gasifier to assist in maintaining the stability of the bed and, therefore, the quality of the product gas Entrained-Bed Processes The Koppers-Totzek Process (Baughman, 1978; Michaels and Leonard, 1978; van der Burgt, 1979) is, perhaps, the best known of the entrained-solids processes and operates at atmospheric pressure The reactor is a relatively small, cylindrical, refractory-lined vessel into which coal, oxygen, and steam are charged The reactor typically operates at an exit temperature of about 1480 C (2696 F) and the pressure is maintained slightly above atmospheric pressure Gases and vaporized hydrocarbons produced by the coal at medium temperatures immediately pass through a zone of very high temperature in which they decompose so rapidly that coal particles in the plastic stage do not agglomerate, and thus any type of coal can be gasified irrespective of caking tendencies, ash content, or ash fusion temperature The gas product contains no ammonia, tars, phenols, or condensables and can be upgraded to synthesis gas by reacting all or part of the carbon monoxide content with steam to produce additional hydrogen plus carbon dioxide Molten Salt Processes Molten salt processes feature the use of a molten bath [>1550 C (>2822 F)] into which coal, steam, and oxygen are injected (Karnavos et al, 1973; La Rosa and McGarvey, 1975) The coal devolatilizes with some thermal cracking of the volatile constituents The product gas, which leaves the gasifier, is cooled, compressed, and fed to a shift converter where a portion of the carbon monoxide is reacted with steam to attain a CO/H2 ratio of 1:3 The carbon dioxide so produced is removed and the gas is again cooled and enters a methanator where carbon monoxide and hydrogen react to form methane
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