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02585 New progress in the mechanism of coal pyrolysis
01
97102581 by Ca(OH),
Microscopic leaching
observation
of coal demineraliration
97102590 Pilot-scale ultra fine clean coal
evaluation
of
Solid fuels (preparation)
hyperbaric
filtration
of
Wanga, J. et 01. Fuel, 1997. 16, (5), 369-374. An investigation into coal demineralization by Ca(OH)? leaching followed by dilute HCI washing. Reflected light microscopy and scanning electron microscopy with energy-dispersive X-ray analysis were used primarily. A Hunter Valley coal was examined both in untampered form and after demineralization with varying levels of residual ash. The major minerals in the original coal are quartz and clay, but as the degree of Ca(OH)2 leaching increased, levels decreased. Some clay was fairly readily removed by demineralization; other clay and quartz, in general, appeared to be less reactive. Extensive leaching led to the removal of as much as 90% of the inorganic matter and few mineral inclusions were observable in the treated coal.
Groppo, J. G. and Parekh, B. K. Coal Prep. (Gordon & Breach), 1996, Il. (l-2), 61-70. An Andritz-Ruthner trailer mounted hyperbaric filter was used to recover minus 200 mesh clean coal by column flotation. Continuous pressure filtration was conducted at pilot-scale on the recovered coal. Results showed that increasing vessel pressure for a given cake formation angle (CFA), increased cake thickness and throughput while decreasing cake moisture. The use of flocculants increased throughput but also increased cake moisture.
97102582
Simic, R. D. et rd. hoc. Annu. Id. Pitt.~hrrrgh Coal Conf., lY96, 13, (2). 820-825. An analysis of coal grade variations was carried out for an open-pit coal mine at a power generation plant and measures were proposed for grade uniformity.
Microwave
desulfurization
of coal
Zhao. Q. et 01. Meitm Zhumhua, 1996, 19, (3). 9-13. (In Chinese) The paper studies the microwave desulfurization of coal. Topics discussed include: (I) di-electrical property vs microwave desulfurization; (2) combined desulfurization by microwave irradiation and acid washing; and (3) role of microwave irradiation in coal desulfurization with fused caustic alkali.
Mild 97102583 (desulfurization) Lin.
L.
pyrolysis
of coal
Diss. Ahstr-. Int.. B, 1997, 57, (IO).
in a dual
Auger
reactor
I36 pp.
The mulled coal process. An advanced fine coal 97102584 preparation technology used to improve the handling characteristics of fine wet coal products Jamison. P. R. Proc. Annu. ItIt. Pittsburgh Coal Conf., 1996, 13, (2). 8hO865. The mulled coal process for improving the handling characteristics of fine wet coal is presented. Commercial demonstrations, applications, and operating costs are discussed.
97102585
New progress
in the mechanism
of coal pyrolysis
Liao, H. et a/. MeitanZhuanhua, lY96, 19. (3), l-8. (In Chinese) New progress in the mechanism of coal pyrolysis are reviewed, focusing on:(I) the formation and transport of volatile products, and (2) network models of coal macromolecules.
97102586
New stage of clean coal technology
in Japan
Kawaguchi, Y. Sekitan Riyo Gijutsu Kaigi Kmnshu 1996, 6th. I-IO, 279282 (In Japanese). The use of coal as an energy source and the development of advanced clean coal technologies including environmentally friendly coal combustion, coal thermal decomposition, and coal cleaning processes are reviewed.
NO reduction by potassium-containing 97102587 quets effect of mineral matter content and coal rank
coal
bri-
Garcia-Garcia, A. et 01. Emqp Furls, 1997, 11, (2), 292-298. The NO reduction activity of several potassium-containing coal briquettes obtained from different coal precursors is examined. with the purpose of understanding the effect of coal rank. Two bituminous coal fractions, with two very distinct ash contents. were selected to determine the influence of the mineral matter content of coals in NO reduction. The catalytic effect of potassium in this reaction was evaluated in a fixed-bed flow reactor. The effect of coal rank is manifested in two ways: larger amounts of potassium incorporated in coal briquettes and higher NO reduction activity as the coal rank precursor decreases, regardless of the reaction temperature during the experiment. Ash contents of the coals seem to have a negative effect in the NO-carbon reaction. The ash contents act as a sink that sinters and deactivates the potassium, forming potassium carbonate and silicates which are both inactive for the process.
Optimization of enrichment 97102588 dak hard coal with column flotation
conditions
of Zongul-
Dalahmetoglu. 0. and Kemal, M. Changing Scopes Miner. Process., Proc. Int. Miner. Process. Symp.. 6th, 1996. 355-360. Edited by Kemal, M. B., Rotterdam, The Netherlands. A study of Zonguldak coal column flotation, including such variables as feeding level. foam thickness, column height, wash water rate, and air rate.
97102589
A parametric
study of dewatering
of fine coal
Sung, D. J. and Parekh, B. K. Coal Prep. (Gordon & Breach), 1996, 17, (l2), 25-38. An experimental design of pressure filtration was used to study fine coal dewatering. The effects of five major process parameters of the dewatering were investigated. The study was started with two factorial experiments to identify the most significant parameters in the filtration process, and concluded with response surface methodologies to establish optimum operating conditions for the dewatering of fine coal.
Possibility of securing uniform coal grade for 97102591 thermal power generating plants by mining and storage process control
97102592 oven
Pretreatment
equipment
for coal charge
for coke
Igai. K. et al. Jpn. Kokai Tokkyo Koho JP 09 31,471 197 31,471] (Cl. CIOBS7/10), 4 Feb 1997. Appl. 951177,620, 13 Jul 1995, 4 pp. (In Japanese) The paper introduces pretreatment equipment for feeding coal charge to a coke oven. It comprises a dryer with classification capability, a collecting apparatus for pulverized coal, a slurry tank, a wet-type granulating apparatus, a dewatering apparatus, and a coal transporting conveyor.
97102593
Pretreatment
of coal before supplying
in coke oven
Igai, K. et al. Jpn. Kokai Tokkyo Koho JP OY 31,469 (97 31,469] (Cl. ClOB53/04), 4 Feb lYY7, Appl. 951177,619, I3 Jul 1995, 4 pp. (In Japanese) The separation of dry coal into coarse powder and fine powder, is then followed by the granulation of a slurry comprising the fine powder, heavy oil and water to give formed coal of particle size larger than the separation point. This is dehydrated and blended with the coarse powder to give product for charging to coke oven. The coal shows prevention of dust dispersion in carbonization.
97102594
Pyrite removal from coal by microbial
Shu. X.rt al.
Mei!nn
Zhuarthuu
199f1, 19, (4). 24-30.
leaching
(In Chinehe)
97102595 Reducing the biased slurry feed subdivision vertical pipe T-junctions using partition wall and stratifier
in
Hu, S. et u[. Miner. Eng., 1997, 10, (2), 163-174. In the coal and mineral processing industry, biased subdivision of slurry feed to a number of unit operations in parallel has been recognized as a problem to be solved. This results in each unit in a multi-unit system to operate with different separation density, particle size distribution and solids concentration. Consequently, some of the units may operate under far from favourable conditions, leading to a significant decrease in the operating efficiencies of the sizing and cleaning units in coal preparation plants. The objective of thi\ work i< to develop new and more robust approaches or devices for unbiased slurry subdivision. The paper propose, the modification of simple T-type splitters with a partition wall or a stratifier to create new slurry flow splitters. A serie\ of rxperimcnts were carried out with a vertical pipe having a T-junction to compare the performance of various approaches to slurry splitting. Effects of flow rate, particle size, density, solids concentration and branch orientation were studied. and the results show that new splitters are very effective in reducing the degree of biased subdivision of slurry flows in vertical T-junctions.
97102596 Reflectance and the actual
analysis of coal feedstocks:
the desired
Kiselev. B. P. Koks /(him. 1996, (Y). I l-14. (In Russian) The use of vitrinite reflectance for compounding coal charges Including the use of lower grade coals is discussed.
97102597 Rehabilitation of an anthracite-burning in Ukraine with introduction of coal preparation
for coking.
power plant
Ruether, J. et ul. Proc. Annu. Int. Pittsburgh Cotrl Con/:, 1996. 13, (2). 1175-l 180. A joint study regarding the rehabilitation of an anthracite-burning power station in the Do&ass region of eastern Ukraine, is being conducted by the United States Department of Energy and the Ukrainian Ministry of Power and Electrification. The Luganskaya GRES power station is labouring under deteriorating coal quality and the physical plant is in need of repair. Approaches under consideration for the rehabilitation include upgrading the existing 200-MW, (gross) wall-fired boilers, re-powering with circulating fluidized bed comhustors, and the use of coal preparation. Results of coal washability tests indicate the coal is amenable to washing. Potential approaches for coal preparation are presented for design value coal for wall-fired boilers while minimizing rejection of Btus and generation of solid waste.
Fuel and Energy Abstracts
July 1997
215
97102581 by Ca(OH),
Microscopic leaching
observation
of coal demineraliration
97102590 Pilot-scale ultra fine clean coal
evaluation
of
Solid fuels (preparation)
hyperbaric
filtration
of
Wanga, J. et 01. Fuel, 1997. 16, (5), 369-374. An investigation into coal demineralization by Ca(OH)? leaching followed by dilute HCI washing. Reflected light microscopy and scanning electron microscopy with energy-dispersive X-ray analysis were used primarily. A Hunter Valley coal was examined both in untampered form and after demineralization with varying levels of residual ash. The major minerals in the original coal are quartz and clay, but as the degree of Ca(OH)2 leaching increased, levels decreased. Some clay was fairly readily removed by demineralization; other clay and quartz, in general, appeared to be less reactive. Extensive leaching led to the removal of as much as 90% of the inorganic matter and few mineral inclusions were observable in the treated coal.
Groppo, J. G. and Parekh, B. K. Coal Prep. (Gordon & Breach), 1996, Il. (l-2), 61-70. An Andritz-Ruthner trailer mounted hyperbaric filter was used to recover minus 200 mesh clean coal by column flotation. Continuous pressure filtration was conducted at pilot-scale on the recovered coal. Results showed that increasing vessel pressure for a given cake formation angle (CFA), increased cake thickness and throughput while decreasing cake moisture. The use of flocculants increased throughput but also increased cake moisture.
97102582
Simic, R. D. et rd. hoc. Annu. Id. Pitt.~hrrrgh Coal Conf., lY96, 13, (2). 820-825. An analysis of coal grade variations was carried out for an open-pit coal mine at a power generation plant and measures were proposed for grade uniformity.
Microwave
desulfurization
of coal
Zhao. Q. et 01. Meitm Zhumhua, 1996, 19, (3). 9-13. (In Chinese) The paper studies the microwave desulfurization of coal. Topics discussed include: (I) di-electrical property vs microwave desulfurization; (2) combined desulfurization by microwave irradiation and acid washing; and (3) role of microwave irradiation in coal desulfurization with fused caustic alkali.
Mild 97102583 (desulfurization) Lin.
L.
pyrolysis
of coal
Diss. Ahstr-. Int.. B, 1997, 57, (IO).
in a dual
Auger
reactor
I36 pp.
The mulled coal process. An advanced fine coal 97102584 preparation technology used to improve the handling characteristics of fine wet coal products Jamison. P. R. Proc. Annu. ItIt. Pittsburgh Coal Conf., 1996, 13, (2). 8hO865. The mulled coal process for improving the handling characteristics of fine wet coal is presented. Commercial demonstrations, applications, and operating costs are discussed.
97102585
New progress
in the mechanism
of coal pyrolysis
Liao, H. et a/. MeitanZhuanhua, lY96, 19. (3), l-8. (In Chinese) New progress in the mechanism of coal pyrolysis are reviewed, focusing on:(I) the formation and transport of volatile products, and (2) network models of coal macromolecules.
97102586
New stage of clean coal technology
in Japan
Kawaguchi, Y. Sekitan Riyo Gijutsu Kaigi Kmnshu 1996, 6th. I-IO, 279282 (In Japanese). The use of coal as an energy source and the development of advanced clean coal technologies including environmentally friendly coal combustion, coal thermal decomposition, and coal cleaning processes are reviewed.
NO reduction by potassium-containing 97102587 quets effect of mineral matter content and coal rank
coal
bri-
Garcia-Garcia, A. et 01. Emqp Furls, 1997, 11, (2), 292-298. The NO reduction activity of several potassium-containing coal briquettes obtained from different coal precursors is examined. with the purpose of understanding the effect of coal rank. Two bituminous coal fractions, with two very distinct ash contents. were selected to determine the influence of the mineral matter content of coals in NO reduction. The catalytic effect of potassium in this reaction was evaluated in a fixed-bed flow reactor. The effect of coal rank is manifested in two ways: larger amounts of potassium incorporated in coal briquettes and higher NO reduction activity as the coal rank precursor decreases, regardless of the reaction temperature during the experiment. Ash contents of the coals seem to have a negative effect in the NO-carbon reaction. The ash contents act as a sink that sinters and deactivates the potassium, forming potassium carbonate and silicates which are both inactive for the process.
Optimization of enrichment 97102588 dak hard coal with column flotation
conditions
of Zongul-
Dalahmetoglu. 0. and Kemal, M. Changing Scopes Miner. Process., Proc. Int. Miner. Process. Symp.. 6th, 1996. 355-360. Edited by Kemal, M. B., Rotterdam, The Netherlands. A study of Zonguldak coal column flotation, including such variables as feeding level. foam thickness, column height, wash water rate, and air rate.
97102589
A parametric
study of dewatering
of fine coal
Sung, D. J. and Parekh, B. K. Coal Prep. (Gordon & Breach), 1996, 17, (l2), 25-38. An experimental design of pressure filtration was used to study fine coal dewatering. The effects of five major process parameters of the dewatering were investigated. The study was started with two factorial experiments to identify the most significant parameters in the filtration process, and concluded with response surface methodologies to establish optimum operating conditions for the dewatering of fine coal.
Possibility of securing uniform coal grade for 97102591 thermal power generating plants by mining and storage process control
97102592 oven
Pretreatment
equipment
for coal charge
for coke
Igai. K. et al. Jpn. Kokai Tokkyo Koho JP 09 31,471 197 31,471] (Cl. CIOBS7/10), 4 Feb 1997. Appl. 951177,620, 13 Jul 1995, 4 pp. (In Japanese) The paper introduces pretreatment equipment for feeding coal charge to a coke oven. It comprises a dryer with classification capability, a collecting apparatus for pulverized coal, a slurry tank, a wet-type granulating apparatus, a dewatering apparatus, and a coal transporting conveyor.
97102593
Pretreatment
of coal before supplying
in coke oven
Igai, K. et al. Jpn. Kokai Tokkyo Koho JP OY 31,469 (97 31,469] (Cl. ClOB53/04), 4 Feb lYY7, Appl. 951177,619, I3 Jul 1995, 4 pp. (In Japanese) The separation of dry coal into coarse powder and fine powder, is then followed by the granulation of a slurry comprising the fine powder, heavy oil and water to give formed coal of particle size larger than the separation point. This is dehydrated and blended with the coarse powder to give product for charging to coke oven. The coal shows prevention of dust dispersion in carbonization.
97102594
Pyrite removal from coal by microbial
Shu. X.rt al.
Mei!nn
Zhuarthuu
199f1, 19, (4). 24-30.
leaching
(In Chinehe)
97102595 Reducing the biased slurry feed subdivision vertical pipe T-junctions using partition wall and stratifier
in
Hu, S. et u[. Miner. Eng., 1997, 10, (2), 163-174. In the coal and mineral processing industry, biased subdivision of slurry feed to a number of unit operations in parallel has been recognized as a problem to be solved. This results in each unit in a multi-unit system to operate with different separation density, particle size distribution and solids concentration. Consequently, some of the units may operate under far from favourable conditions, leading to a significant decrease in the operating efficiencies of the sizing and cleaning units in coal preparation plants. The objective of thi\ work i< to develop new and more robust approaches or devices for unbiased slurry subdivision. The paper propose, the modification of simple T-type splitters with a partition wall or a stratifier to create new slurry flow splitters. A serie\ of rxperimcnts were carried out with a vertical pipe having a T-junction to compare the performance of various approaches to slurry splitting. Effects of flow rate, particle size, density, solids concentration and branch orientation were studied. and the results show that new splitters are very effective in reducing the degree of biased subdivision of slurry flows in vertical T-junctions.
97102596 Reflectance and the actual
analysis of coal feedstocks:
the desired
Kiselev. B. P. Koks /(him. 1996, (Y). I l-14. (In Russian) The use of vitrinite reflectance for compounding coal charges Including the use of lower grade coals is discussed.
97102597 Rehabilitation of an anthracite-burning in Ukraine with introduction of coal preparation
for coking.
power plant
Ruether, J. et ul. Proc. Annu. Int. Pittsburgh Cotrl Con/:, 1996. 13, (2). 1175-l 180. A joint study regarding the rehabilitation of an anthracite-burning power station in the Do&ass region of eastern Ukraine, is being conducted by the United States Department of Energy and the Ukrainian Ministry of Power and Electrification. The Luganskaya GRES power station is labouring under deteriorating coal quality and the physical plant is in need of repair. Approaches under consideration for the rehabilitation include upgrading the existing 200-MW, (gross) wall-fired boilers, re-powering with circulating fluidized bed comhustors, and the use of coal preparation. Results of coal washability tests indicate the coal is amenable to washing. Potential approaches for coal preparation are presented for design value coal for wall-fired boilers while minimizing rejection of Btus and generation of solid waste.
Fuel and Energy Abstracts
July 1997
215