03758 Steam gasification of coal chars

03758 Steam gasification of coal chars

04 96103752 Monte Carlo simulations combined with UHVatmospheric pressure reaction studies on CO hydrogenation on cobalt Lahtinen, J. er a[., Top. Ca...

178KB Sizes 2 Downloads 201 Views

04

96103752 Monte Carlo simulations combined with UHVatmospheric pressure reaction studies on CO hydrogenation on cobalt Lahtinen, J. er a[., Top. Catal., 1995, 2, (1) 173-181. The authors show that useful information on catalytic reactions can be obtained using Monte Carlo simulations combined with experimental data from model catalysts. The experimental rate dependencies of CO hydrogenation on the partial pressures were used to guide the selection of different parameter values used in the simulations,

New process

for underground

gasification

of coal

Kreinin. E. V. Khim. Tverd. Topl. (Moscow), 1995. (6). 58-65. (In Russian) Based on analysis of field data, measures are recommended to increase the efficiency of underground gasification of coal.

96103754 Petroleum engineering applied for coal-bed methane productlon -Ilkellhood In Croatia Labudovic. V. er al., Mafia (Zagrebj, 1995, 46, (1 l), 441-446. The pore space of a coal deposit is often saturated with methane. This valuable energy source can be detected, produced and used ‘locally’ as fuel and as raw material for chemical production. Coal deposits and the content of their pore space can be detected and quantitatively evaluated by well logging. If satisfactory quantity and quality of gas is established, the wellbore surrounding can be stimulated by hydraulic fracturing, by chemical stimulation or other adequate methods, as well as by horizontal or extended reach re-entry wellsIn favourable reservoir conditions, daily gas production up to 5000 m’ per well may be expected. Usually this production is economical if there are small local consumers. Beside the use of gas as an ecological clean energy source, the coal deposit is liberated of methane dispersed in its pores.

96/03755 Potentlal for preparatlon of hot gas clean-up sorbents from spent hydroprocesslng catalysts Furimsky, E. and Biagini, M. Fuel Process Technol., 1996, 46, (I), 17-24. Three spent and decoked hydroprocessing catalysts and two corresponding fresh catalysts were tested as hot gas cleanup sorbents and compared with zinc ferrite using a simulated coal gasification gas mixture. The catalysts deposited only by coke exhibited relatively good cleaning efficiency. The catalyst deposited by coke and metals (V and Ni) was less efficient. The useful life of the spent hydroprocessing catalysts may be extended if they are used as hot gas clean-up sorbents. 96103756 Slgnlflcant difference In the desorptlon behavior of oxygen surface complex on carbon In He and In 0, Zhuang, Q. er al., Coal Sci. Technol., 1995, 14, (1). 507-5 10. To determine the desorption behaviour of surface complexes during oxygen gasification of carbon, the transient response upon switching the reactant gas from ‘*O to “0 was analyzed. The transient response upon switching from oxygen to He was also carried out to compare the desorpttve behaviour Discusses the type of surface complexes involved in the gastfication Some features of lignite gasification in fluidized 96103757 bed of disposable catalysts Kuznetsov. B. N et al., Coal Sci. Teclmol., 1995, 24, (1). 710-722. The paper discusses a study of lignite gasification in air-steam mixture in conventional and circulating fluidized beds tn the presence of disposable Fe-containing materials. The presence of open-hearth furnace slag particles rn :he process favoured the uniform temperature distribution along the reactor height, Improved mass and heat transfer, and increased the residence time for lignite particles in the reaction zone

Steam gasification of coal chars 96103750 Clemens, A. H. et al., Coal Sci. Technol., 1995, 24, (1) 715-718. The paper describes how chars derived from acid washed New Zealand lignite and subbituminous coal containing less than 10% of their original calcium content were steam gasified at temperatures ranging from 800 to 1100°C. Rates of carbon consumption and composition of product gas were monitored every 90 s. Chars derived from samples in which calcium levels were partially restored by ion exchange and from an untreated sample were also Investigated 96103759

Steam gasification of Tarfaya’s (Morocco) oil shales Nabih, K. and Belkbrr, I.. Coal Ser. Techno/., 1995, 24, (1). 567-570. The dynamic thermogravimetric analysis was used to investigate steam gasification of the oil shales. The steam gasification increased the weight loss of oil shale at temperatures above 330°C compared to the pyrolysi\ under N. The heating rate, the flow rate and the particle size had a considerable effect on the reactivity of the rock, whtle the sample weight had a weak effect over the weight range studied.

By-products

related

fo fuels

96103760 System for coal gasification in power generation plant Ikeguchi, T. er al., (Assrgrled ro) Hirachl Lrd., .JAP. Par. JP.O7,305,607, hTov. 1995. The system consists of a gasifier, an air separator for producing oxygen as oxidizing agent for coal gasification, a compressor for suoulvine air for separati&t, 2 gas turbine For generating power using gases’from gasification: a eas turbine for drivine the comoressor. and a heat-recoverv boiler for rec&ering heat from flue”gases fro’m the turbines to generate steam

96103761 Tests of fluidized-bed gasification of brown coal from the Jiri open-pit mine Slouka, P. Uhli-Rudy-Geol. Pr~~kum., 1995, 2. (ll), 344-346. (In Czech) Describes the experience with the development of procedure and equipment for high-pressure fluidized-bed gasification of brown coal.

04 BY-PRODUCTS

RELATED TO

FUELS 96103762 Abraslon resistance of high-strength concrete made wlth Class C fly ash Naik, T. R. er al., AC1 Marer. J., 1995, 92, (6), 649659. This work was carried out to evaluate the abrasion resistance of concrete proportioned to have five levels of cement replacements with one source of Class C fly ash. 96103763 Activated carbons from bltumlnous coal In a fluidlzed bed pllot plant. Influence of the operating variables Martin-Gullon, I. er al., Coal Sci. Technol., 1995, 24, (1) 1113-1116. Describes a continuous three-stage fluidized bed pilot plant which has been designed and built in order to produce activated carbons by steam activation, without any previous carbonization step, from a high volatile bituminous coal. The reactor, with the stages in vertical configurations connnected by downcomers, operates continuously with a production rate of 40 kg/day.

96103764 Advanced catalysts for coal-derlved liquids hydrotreatlng vla acldlc supports Cambra, J. F. et al., Coal Sci. Teclmol. 1995, 24, (2) 1287-1290. Presents a study of acidity and hydrotreating activity of CO-MO and Ni-Mo catalysts on two different acid carriers (i.e. fluorinated gamma-alumina and ultrastable Y zeolitel. 96103765 Aminatlon of Buckmlnsterfullerene C, at low temperature: Application in polyamide synthesis Hwu, J. R. er al., Fullerme Science & Technol., 1996, 4, (3), 407-422. The addition of diamines to C, was performed under different conditions; tt proceeded efficientlv at low temperatures. Reaction of the adducts with dtcarboxylic acid derivatives produced polyamides. Interactton between aminer and C,,,, was studied hy molecular modelling.

Application of coal-containing waste in production 96103766 of brick and expanded clay aggregate Galpern, E. J. Coal Sci. Techrlol., 1995, 24, (2) 1633-1636 The paper describes how wastes from coal extraction and preparation are used in firing of building materials, such as ceramic bricks and expanded clay aggregate. 96103767 An atlas of fullerenes The lnrernarional Series of Fowler. P. W. and Manoloooulos. D. E. Mmog;~rphs O,I Chemrry, ’Clarerldott Press, Oxford, UK, ISBN O-19: 85~787-6. 1995, 392 pp. Binders for short carbon fiber-reinforced carbon 96103760 comoosite orecursor manufacture Narita, N. e/al., (Assigtled ro) Shimirrersu Kagaku; Slnnnippon Seitersu KK. JAP Par. JP.O7,309.678, Nov. 199s. Biomagnetic separation of titanium-rich fractions 96103769 from coal fly ash and from precipitated acidic leachate of coal fly ash Shabtai. Y and Fleminger, G. Resour. EmGot!. Bloreclmol., 1995, 1, (I), l-14, The paper discusses how the enormous amounts of coal fly ash produced by coal-fired power stations in Israel can be exploited as a source of aluminum by acidic leaching and extraction of Al and Ti coupled with removal of toxtc metals from the ash During such leaching, more than 30% of the ~~luminum and tttantum contained in the ash, as well as most of the toxic metals;. were released.

Fuel and Energy

Abstracts

July

1996

265