00401 Study on gasification reactivity of fly ash from fluidized bed gasifier. I. Gasification reactivity difference between fly ash and char made f

00401 Study on gasification reactivity of fly ash from fluidized bed gasifier. I. Gasification reactivity difference between fly ash and char made f

05 into which oxygen-containing gasification agents and optionally recycled solids are fed. The height of the conical section is greater by a factor o...

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05 into which oxygen-containing gasification agents and optionally recycled solids are fed. The height of the conical section is greater by a factor of I-h than the diameter of the cylindrical section. In the fluidized bed, a uniform radial gas flow profile is generated in every horizontal cross-sectional plane, and average gas flow rate in the fluidized-bed region is constant or slightly increased along the longitudinal axis of the gasifier.

Progresses on the research of coal-based polymer 97100392 alloy material Zhou. A. (‘I rrl.. Mcitrlrr Zlzuanhua. 1996, 19, (2). 39-47. (In Chinese) Presents the research on headings: (I) characters and its compatibility. (3) performance of polymer polymer alloy material, polymer alloy. Forty-nine

coal-based polymer alloy material with subdivision and structure of coal polymer, (2) polymer alloy preparation technology of polymer alloy, (4) high alloy, (S) research and development of coal-based (6) the prospects of the research on coal-baaed references are given.

Properties of carbon 97100393 various degrees of metamorphism. Drozdnik, I. Presents the sampleq and the \orbcntr

97100394

sorbents

from

coals

with

D. c/ ul.. kooks K/tint. l9Y6. (2), 16-19. (In Russian) results of a study into the sorption properties of various coal their comparison with standard values. The sorption ability of strongly depended on the degree of metamorphism.

Recycling

of used paper as a building

material

Mihashi. H. <‘I rrl., RII.EM from. 1995. 27 (Disposal and Recycling of Organic and Polymeric Construction Materials), 261-270. Describes a prolcct in which waste paper was recycled as a building material. Artificial lightweight aggregates were developed in which large amounts of fly ash from coal-fired electric power plants and wastepaper produced from office automation machines were used. Strength properties of ccmentitious composite materials containing the lightweight aggregates were poor. Possible improvements are discussed.

97100395 ash

Selective

beneficiation

for high loss-of-ignition

fly

Groppo, J. G. r/ ol.. /Min. tn~. (Litrleton. Co/o.), 1996, 48, (6). 51-53. A beneficiation process was developed to provide selective sepn. of unburned C from high Ions-of-ignition fly ash. Using froth flotation to achieve selective \epns. requires long residence times and high reagent costs; so a proprietary reagent system was developed to address these limitations. Ba%ed on results obtained from lah. and pilot-scale studies. a flowsheet design was developed to produce two distinct usable products from class F fly a\h: low LOI ash and a high-C product suitable for reburning or further upgrading.

97100396 rials Ozati:r. T..

Silver supported

on zeolites

as antimicrobial

mate-

Kokai Tok-kyo Koho. JP 08,127.508 [96.127.508] (Cl. AOINSY. In), ?I May 1096, JP Appl. 941240,760. 9 Sep IY94; 5 pp. (In Japanese) In the experiments discussed antimicrobial) materials comprise zeolite particles on which silver is supported at larger amounts than the ionexchange capacity. Artificial zeolite (obtained by alkaline treatment of coal a\h). on which 50 wt% silver was supported, totally controlled the growth of As/r,cVjir//irv nih’cr. Perrir~illiclm firrticulosurn. Aureohasidium pulldam. and other fungi.

97100397 production

Status and progress on the technology from coal by plasma pyrolysis

of acetylene

Chen, H-G. et ul.. Mcrrari Zhuanhua, 1996, 19, (2). IY-24. (In Chinese) 9 references are included in this review of the techno]ogy of the production of acetylene from coal by plasma pyrolysis including: (I) the development background. (2) influences of the reactor structure, coal properties and the technical parameters on the process of plasma pyrolysis, (3) mechanism of and (4) direction of further research for production preparation. technology.

Steam cracking method and plant 97100398 powder injection from a single collection point

comprising

4 Jul Lenglet, E. er al., PCT Int. Appl. WO 96 20,256 (Cl. kiOGY/ln), 1996, FR Appl. Y4115.746, 26 Dee lY94. (In French) This paper examines a steam cracking method and plant which uses erosive powder injection for at least partially decoking quenching exchangers without breaking the steam cracking cycle. The powders are preferably injected slightly upstream from the quenching exchangers and separated from the cracked gases in primary gas/solid separators, temporarily stored in temperature-controlled collecting tanks, and delivered to a common powder storage and/or processing module by pressure transfer using a relatively small flow of non-condensable gas. The method and plant may be used to collect solid fragments generated by the injection of chemical compound< used as catalysts for the steam gasification of coke.

Nuclear fuels (scientific, technical)

97100399 Study on chemical structure of vacuum residue Illinois No.6 coal from NEDOL coal liquefaction process

of

Tanaka, T. cf al., S&tan Kf~~~ktr Ku& Happyo Rordmnsh~r. 1Y93, 30. I I X121. (In Japanese) In this study a vacuum residue of Illinois No. 6 coal (IL-53) from NEDOL coal liquefaction process was analysed by “(I‘-NMR, FTIR, and pyrolysis GC-MS. The results for these analyses strongly suggest that dealkylation. deoxygenation. and condensation of aromatic hydrocarbons took place during the NEDOL coal liquefaction process.

97l60460 Study on CO2 gasification of iron-loaded chars by a temperature-programmed reaction technique Cui, H. et 01.. Ranliao Huaxue Xuehao. 1996. 24. (2). 102-167. (In Chinese) In this study zalainor coal chars loaded with ferric nitrate (HIT X00 ) were gasified with CO: using a temperature-programmed reaction technique at several heating rates. Some special features were noticed in the catalytic gasification. The reactivity of coal chars was established and factors influencing the reactivity of char were discussed. An oxygen-transfer mechanism was used to explain the catalytic actions of Fe during gasification in COZ.

97/00401 Study on gasification reactivity of fly ash from fluidized bed gasifier. I. Gasification reactivity difference between fly ash and char made from laboratory Fang, Y. cf al., Rardiao Huaxrre X~rehao. 1006, 24, (2). 143-140. (In Chinese) This article presents a discussion on the difference in gasification reacttvity of two chars from Shen Fu coal. The gasificaticrnc were carried out in a thcrmobalance with CO:. Hz0 and their mixture. The reaction tempera.In C + CO: reaction. the reactivity of fly ash tures were from 900 to 1000’ from a fluidized bed gasifier is higher than that of the char made in a laboratory. However. in the presence of steam (C + H20. c‘ + CO2 + H:O), the reactivity of char is higher than that of fly ash. The relation\ between gasifications reactivity and microporou\ surface arca arc studied tn microstructure scale.

97100402 Study on preparation of nitro-humic grade coal oxidized with nitric acid

acid from low

Ni. X. et rrl., M&an Zhumhua, 1996. 19, (2). X0-Xf). (In C‘hinese) Samples of the nitro humic acid material (NHAm) were prepared hy oxidation of the low-grade coal with HNO?. The effect of HNO? concentration. oxidization temperature. oxididation duration, and coal particle size on the yield obtained was studied. The optical density and the major active chemical radicals of the NHAm product were determined. by FT-IR.

05

NUCLEAR Scientific.

FUELS

Technical

97/00403 Accounting for spatial variability in environmental gamma ray spectrometry

and fileds of view

Tyler, A. N. er (il.. Journal of Environmet~tal Rndroacttwty. lY96. 33, (3), 213-235. Spatial variahility is an important feature in many environmental studies, which influences comparison estimates of environmental radioactivity from soil samples and in-situ or airborne i-ray apectrometry. Comparisons between ground based and airborne gamma ray spectrometry are need hoth for interpretation and for calibration purposes. However. under normal environmental conditions such comparisons may be affected by the considerable differences in the spatial response of these measurement techniques. A sampling methodology is presented which enables soil sample derived estimates of environmental radioactivity to he effectively compared with in-situ and aerial survey results. Examples of calibration sites and derived sensitivity estimates for “‘Cs are presented for a range of environmental contexts.

97/00404 of actinides

Application of the pyrochemical from LWR spent fuel

process

to recycle

McPheeters, C. C. et al., Progrc.rs in NircIcar Encr&y, 1097, 31. (l/2), 17% 186. This paper examine? the recycling of actinides. ‘The integral fast reactor (IFR) process includes recycle of all of the actinides contained in spent IFR fuel, and thus reduces waste disposal challenges. Pyrochemical processes also appear suitable for recovering and recycling acttnides from spent fuels from light water cooled reactors (LWRs). Following surveys of many pyrochemical processes, two candidates have been selected for further development. A calcium/salt transport process operating at 800 to 85o’C appears to recover the transuranic (TRU) elements efficiently. The oxide

Fuel and Energy Abstracts

January

1997

29