Discussion on fouling in coal-water slurry pressurized gasification

Discussion on fouling in coal-water slurry pressurized gasification

03 Gaseous fuels (derived gaseous fuels) Independent review of global explored deposits indicates that coal will most likely become the central fuel i...

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03 Gaseous fuels (derived gaseous fuels) Independent review of global explored deposits indicates that coal will most likely become the central fuel in this century and beyond. Gasrich coal deposits are considered the valuable non-conventional hydrocarbon source. In terms of equivalent energy, coal-bed methane holds the third or fourth position world-wide following coal, crude oil and natural gas, thereby comprising a valuable resource base component. 03/00580 Discussion on fouling in coal-water slurry pressurized gasification Zhao, Y. Mei Huagong, 2002, (1), 44-47. (In Chinese) Through analysing fouling in coal-water slurry pressurized gasification, the paper discusses the technical innovation in detail, and the improvement of the operating methods. 03/00581 Environmental benefits of underground coal gasification Liu, S.-Q. et al. Journal of Environmental Sciences (China), 2002, 14, (2), 284-288. Environmental benefits of underground coal gasification are evaluated. Through underground coal gasification, gangue discharge is eliminated, sulfur emission is reduced, and the amount of ash, mercury, and tar discharge are decreased. Moreover, effect of underground gasification on underground water is analysed and COz disposal method is put forward. 03/00582 Exergy analysis of methanol-IGCC polygeneration technology based on coal gasification Duan, Y. et al. Tsinghua Science and Technolog, 2002, 7, (2), 190~-193. Poly-generation is a key strategy for manufacture of ultra-clean energy products highly competitive with conventional IGCC [integrated gasification combined cycles (elec. power generation technology)] energy systems. A poly-generation system based on coal gasification was analysed using the exergy method to calculate the thermal efficiency of the system. The poly-generation system generates less pollutants and has higher efficiency than separate systems.

manufacture of olefins, alcohols H, synthesis gas, ammonia, etc. are also described. Fuel cell system equipped with the said apparatus for nrenaration of H bv reaction of hvdrocarbons and steam under preience of Fe, Ni, dr, or alumina catalyst is also given. 03/00587

Nitrogen evolution

during rapid hydropyrolysis

of

Xu. W.-C. and Kumaaai. M. Furl. 2002. 81. (18). 2325-2334. The behaviour of ni;ogen evolution during rapid hydropyrolysis of coal has been investigated at temperatures ranging from 923 to 1123 K and hvdrogen pressure UP to 5 MPa using- a -continuous free-fall pyrolyser. Three coals have been tested in this study. The dominant nitrogen gaseous species is ammonia, together with a- small amount of HCN because most of HCN is converted to NH3 through secondary reactions. The results show that the evolution of nitro&n in coal is caused mainly by devolatilization at temperatures below”973 K, while the evolution-of volatile nitrogen in char-is accelerated with increasing temperature and hydrogen pressure. The mineral matter in coal act as catalysts to promote thee e;olution of volatile nitrogen in char to N2 apparently ai high temperatures of 1123 K, as found during pyrolysis Of coal by other studies. A pseudo-first-order kinetic model was applied to the evolution of nitrogen in coal during rapid hydropyrol&. The model shows the activation energy for thenitrogen evolution from coal is 36.6-58.6 kJ/mol while the rat;of the nitrogei evolution depends on hydrogen pressure in the order of 0.16-0.24. 03/00588 Optimization of operation condition on gasifier with low energy consumption and high coal gas output Ma, F. Mei Huqong, 2002, (I), 54-56. (In Chinese) In this namer introduce the oneration conditions of PKM coal eas production installation are discussed, the effects of technique char&e upon coal gas output, manufacturing cost and energy cdnsumpti& reviewed, and also corresponding improvement program proposed. 03/00589

Partial aasification

of Ukrainian

steam coals in

03/00583 Gaseous hydrogen production by water dissociation method Lipovetsky, V. International Journal of HJ,drogen Energy,, 2003, 28, (4), 377-379. Gaseous hydrogen production is based on employment of the water dissociation process, intensified by action of a high water temperature and increase of the minus electric field, as a factor for water dissociation instead of electric current used in electrolysis. The water dissociation method makes it possible to produce concurrently both gaseous hydrogen and electric power in the operating reactor. The main power type used is thermal. 03/00584 Gasification of coals in high-temperature shaft furnaces Volovik, A. V. et al. Ekologiya i Promyshlennost Rossii, 2002, 37-38. (In Russian) This paper presents a high-temperature shaft furnace. A portion of blast can be fed into this furnace directly into a liquid metal bath. As a result, the temperature of fussion products increased from 14501550°C up to 2100-2200°C. Manufacture of expensive ferroalloys and coal gasification products gives the possibility to produce electric power by very low prime cost. 03/00585 Hydrogen production from coal by separating carbon dioxide during gasification Lin, S. et al. Fuel, 2002, 81, (16), 2079-2085. Hydrogen generation during the reaction of a coal/CaO mixture with high pressure steam was investigated using a flow-type reactor. Coal, CaO and CO reactions with steam, and CO2 absorption by Ca(OH)2 or CaO occurred simultaneously in the experiment. It was found that H2 was the primary resultant gas, comprising about 85% of the reaction products. CO2 was fixed into CaCOs and CO was completely converted to Hz. Pyrolysis of the coal/CaO mixture carried out in N2 was also examined. The pyrolysis gases were compared with gases produced by general coal pyrolysis. While general coal pyrolysis produced about 14.7% Hz, 50.5% CH4, 12.0% CO and 12.0% C02, the gases produced from coal/CaO mixture pyrolysis were 84.8% HZ, 9.6% CH4, 1.6% COz and 1.1% CO. 03/00588 Method and apparatus for manufacture of gases with less energy consumption Nakatani, J. Jpn. Kokai Tokkyo Koho JP 2002 241,774 (Cl. ClOL3/06), 28 Aug 2002, Appl. 2001/38,691, 15 Feb 2001. 9. (In Japanese) The apparatus comprises a reaction tower, which is equipped with a catalyst and a pair of electrodes, for generation of low-temperature plasma, in the reactant path. Gases are manufactured by excitation of the reactants with low-temperature plasma. Method and apparatus for 146

Fuel and Energy Abstracts

May 2003

03/00591 Procedure and apparatus for separation of solid particles from raw coke oven gas Nelles, L. and Liebisch, R. Ger. DE 10,104,391 (Cl. BOlD47/00), 5 Sep 2002, Appl. 10,104,391, 19 Jan 2001. 8. (In German) Gases formed during coking and especially during charging of coke ovens are withdrawn from the furnace top, cooled by scrubbing with a liquid medium (e.g. ammonia water), fed into a collecting line, and then fed to a raw gas treatment unit downstream. After cooling, the gases are additional treated with a liquid medium (preferably the same medium) in the collecting line to improve separation of dust particles. 03/00592 Progress of preparation of syngas by catalytic partial oxidation of natural gas Guo, J. pt al. Henan Huagong. 2002, (2), l-2. (In Chinese)