FIVE in C#

Scanning Code 128 Code Set A in C# FIVE

CHAPTER FIVE
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In the entrained flow gasifier a dry pulverized solid, an atomized liquid fuel, or a fuel slurry is gasified with oxygen (much less frequent: air) in cocurrent flow The gasification reactions take place in a dense cloud of very fine particles Most coals are suitable for this type of gasifier because of the high operating temperatures and because the coal particles are well separated from one another The high temperatures and pressures also mean that a higher throughput can be achieved; however, thermal efficiency is somewhat lower as the gas must be cooled before it can be cleaned with existing technology The high temperatures also mean that tar and methane are not present in the product gas; however the oxygen requirement is higher than for the other types of gasifiers All entrained flow gasifiers remove the major part of the ash as a slag as the operating temperature is well above the ash fusion temperature A smaller fraction of the ash is produced either as a very fine dry fly ash or as black colored fly ash slurry Some fuels, in particular certain types of biomasses, can form slag that is corrosive for ceramic inner walls that serve to protect the gasifier s outer wall However some entrained bed type of gasifiers do not possess a ceramic inner wall but have an inner water- or steam-cooled wall covered with partially solidified slag These types of gasifiers do not suffer from corrosive slag Some fuels have ashes with very high ash fusion temperatures In this case mostly limestone is mixed with the fuel prior to gasification Addition of a little limestone will usually suffice for lowering the fusion temperatures The fuel particles must be much smaller than for other types of gasifiers This means the fuel must be pulverized, which requires somewhat more energy than for the other types of gasifiers By far the most energy consumption related to entrained bed gasification is not the milling of the fuel but the production of oxygen used for the gasification In high temperature conditions (typically 1300 1400 C) high boiling oils and tars are almost completely destroyed This type of gasifier was developed for coal and limited experience with biomass is available A more recent development is the open core gasifier design for gasification of smallsized biomass with high ash content However, the producer gas is not tar free In the open core gasifier the air is sucked over the whole cross section from the top of the bed This facilitates better oxygen distribution since the oxygen will be consumed over the whole cross section, so that the solid bed temperature will not reach the local extremes (hot spots) observed in the oxidation zone of conventional gasifiers due to poor heat transfer Moreover, the air nozzles in conventional gasifiers generate caves and create obstacles that may obstruct solid flow especially for solids of low bulk (eg, rice husk) On the other hand, the entry of air through the top of the bed creates a downward flow of the product gases thereby transporting the tar products to the combustion zone Finally, air-blown reactors (of any of the above type) produce reaction heat by partial oxidation inside the reactor and the product gas is diluted with nitrogen The use of oxygen (or oxygen-enriched air) results in more concentrated gases Indirect heating of the reactor is achieved by means of hot solids or through heat exchanger walls
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552 Gaseous Products The products of coal gasification are varied insofar as the gas composition varies with the system employed and the predetermined follow-up to the production of products (Fig 513) It is emphasized that the gas product must be first freed from any pollutants such as particulate matter and sulfur compounds before further use, particularly when the intended use is a water gas shift or methanation (Cusumano et al, 1978; Probstein and Hicks, 1990)
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