Patent
Gasification of coal liquefaction residues
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In this paper, a method for gasifying the bottoms fraction from a coal liquefaction process by mixing the bottom fraction with at least one finely-divided calcium compound selected from the group consisting of calcium oxide, calcium carbonate and calcium hydroxide is presented.Abstract:
A method for gasifying the bottoms fraction from a coal liquefaction process by mixing the bottoms fraction with at least one finely-divided calcium compound selected from the group consisting of calcium oxide, calcium carbonate and calcium hydroxide with the calcium compound being of a size consist no larger than about -200 Tyler mesh and present in an amount sufficient to produce agglomerate particles upon mixing with the bottoms fraction and thereafter gasifying the resulting agglomerate particles by reacting the agglomerate particles with steam in a fluidized bed.read more
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Method of catalytic gasification with increased ash fusion temperature
TL;DR: A high ash fusion catalyzed gasification process is described in this article, where a mixture of 50 to 90 weight percent finely divided carbonaceous material particles of a size smaller than 65 mesh and 10 to 50 weight percent fine-grained calcified calcium compounds of a smaller size are used to form a carbonaceous suspension of calcium compounds.
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TL;DR: In this article, a process of tar destruction in gasification of carbonaceous material comprising providing a mixture of finely divided calcium compound of a particle size smaller than 65 mesh and finely divided carbonized material of a part size less than 65 meshes, the calcium compound to carbonaceous mixture ratio being from about 0.5 to 1.
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John D. Sudbury,Clyde W. Zielke +1 more
TL;DR: In this article, a method of forming a liquefied coal product having a lower sulfur percent by weight than the solid coal from which it is derived is derived comprising the steps as follows: (a) providing solid coal having a sulfur% by weight of a particle size less than about 14 Tyler mesh, (b) providing calcium oxide, of particle size smaller than about 40 Tyler mesh and mixing said solid coal and said calcium oxide with liquefaction solvent to form a liquid mixture, hydrogenating and heating said liquid mixture to at least about 750° F
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Method for the treatment of residues obtained from hydrogenation of coal
TL;DR: In this paper, the residual material is mixed with solid materials of which the softening point is above of that of the residual materials, and at least part of the mixture is agglomerated.
References
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Multi-stage fluidized bed coal gasification apparatus and process
TL;DR: In this article, an approach for totally gasifying coal to form a gaseous fuel having a low sulfur content utilizing two fluidized beds, the first fluidized bed providing devolatilization and having a tubular member disposed therein in an upright position wherein coal is mixed with recirculated char and dolomite or lime to remove the sulfur.
Patent
Coal liquefaction bottoms conversion by coking and gasification
TL;DR: In this paper, heavy coal or carbonaceous solids are converted into more valuable products by adding an alkaline earth metal compound to the bottoms in a concentration sufficient to give, following pyrolysis of the coal, an atomic ratio of between 0.005:1 to about 0.1:1.
Patent
Production of fixed bed gasifier feedstock and fuels from coal
TL;DR: In this article, a two-step process for the production of fixed bed gasifier feedstock from a coal liquefaction effluent slurry is provided, which comprises (a) treating a coal-derived carbonaceous solids to form agglomerates in a pumpable slurry; and (b) converting the pumpable liquid mixture to larger-size agglerates or pellets by the addition of further coalderived solids under pelletizing conditions.