The Experts below are selected from a list of 27 Experts worldwide ranked by ideXlab platform

Don Smook - One of the best experts on this subject based on the ideXlab platform.

  • removal of mineral material from Solvent Refined Coal by Solvent extractions
    Fuel Processing Technology, 2007
    Co-Authors: Don Smook
    Abstract:

    Solvent Refined Coal (SRC), a Coal extract which is highly polyaromatic in character and relatively high in N, O and S content, is derived from the direct liquefaction of Coal. SRC contains mineral matter in the form of soluble organometallic compounds which can not be removed by filtration. These soluble species can be detrimental to the hydrocracking catalyst used in the upgrading of the SRC to high-value liquid fuels. These species, however, can be separated from the SRC by extraction with benzene or tetralin as Solvents so that the mineral matter is mainly concentrated in the Solvent-insoluble fraction, the other fraction are then readily hydrocracked, as demonstrated in this work.

B B Brahmachari - One of the best experts on this subject based on the ideXlab platform.

  • Solvent Refined Coal from high ash non weakly coking Coals for use in metallurgical coke making part ii utilization as a coking additive
    Fuel Processing Technology, 1997
    Co-Authors: S B Choudhury, P K Chatterjee, A N Bose, S N Mukherjee, S S Chatterjee, S Sarkar, Rajendra Prasad, S K Ghosh, S R K Rao, B B Brahmachari
    Abstract:

    Abstract Solvent Refined Coal (SRC) prepared from high-ash Indian non/weakly coking Coals, as reported earlier (S.B. Choudhury, B.B. Brahamachari, S.R. Dwivedi, A.K. Roy, P.K. Dasgupta, M. Chakraborty, R. Hague, Solvent Refined Coal from high-ash non-coking Coals/washery middlings for use in metallurgical coke making: part I, Fuel Processing Tech., USA, June '96, pp. 203–213), when blended in small doses (8–12%) with substandard coking blends and carbonised, yields coke with increased anisotropy as well as hot and cold strengths. This is reflected by positive improvement in the values of the Micum indices (M 40 and M 10 ), coke reactivity index (CRI) and the coke strength after reaction with CO 2 (CSR) and also the optical texture of the resultant coke as reported in this paper. The authors confirmed, by pilot scale carbonisation tests (250 kg/batch) that SRC produced by the technology developed (S.B. Choudhury, B.B. Brahamachari, S.R. Dwivedi, A.K. Roy, P.K. Dasgupta, M. Chakraborty, R. Hague, Solvent Refined Coal from high-ash non-coking Coals/washery middlings for use in metallurgical coke making: part I, Fuel Processing Tech., USA, June '96, pp. 203–213) can help in substituting high-fluid low ash prime coking Coals (PCC) to the extent of 30% (by weight). The use of SRC can thus accommodate additional quantum of medium coking Coals (MCC) in the coking blends of the major Indian steel plants. The large reserves of indigenous medium coking Coals, especially low volatile medium coking Coals (LVMC) after beneficiation can also be used in the blends for making blast furnace grade coke thereby conserving scarce prime coking Coals.

  • Solvent Refined Coal from high ash non coking Coals and washery middlings for use in metallurgical coke making part 1 production testing and characterisation
    Fuel Processing Technology, 1996
    Co-Authors: S B Choudhury, S R Dwivedi, P K Dasgupta, B B Brahmachari, A K Roy, M Chakraborty, Rezaul Haque
    Abstract:

    Abstract This paper presents studies on the preparation of a potential coking additive, Solvent-Refined Coal (SRC), from typical high-ash Indian non-coking bituminous Coals, tertiary Assam Coal with a high sulphur content and washery middlings in a bench-scale unit (10 kg h−1 Coal throughput capacity) under hydrogen pressure. The extraction of the Coal samples was conducted under moderate reaction conditions of temperature, pressure and residence time. No external catalyst was used in the process. Pre-beneficiated Coal was used as the feed material and anthracene oil with a boiling range of 270–360°C was used as the Solvent. Rigorous solid separation from the extract slurry by filtration was avoided by centrifugation in a super-decanter centrifuge to produce SRC with an ash content of 6–7%. The yield of SRC from non-coking Samla seam Coal of the Raniganj Coalfield was found to be 85% while its caking index was 44. Substantial improvement in the quality of blast furnace-grade coke was achieved by co-carbonisation of coking blends by mixing only 10% of the SRC prepared from Assam Coal. The hydrogen requirement was low (1.5% wt/wt of d.a.f. Coal) and recovery was of the order of 96% of the Solvent used for the preparation of the Coal-oil slurry. The yield of SRC and its quality as a coking agent are reported, along with the quality of the coke produced using SRC obtained from typical Coal.

  • Solvent Refined Coal studies on the behaviour of an iron catalyst
    Fuel Processing Technology, 1995
    Co-Authors: S R Dwivedi, P K Dasgupta, P K Chatterjee, A N Bose, S N Mukherjee, S S Chatterjee, B B Brahmachari
    Abstract:

    Abstract In this paper an attempt is made to study the effect of Solvent extraction on Coals from Assam, South Karanpura and Singrauli Coalfields of India. Experiments were carried out in autoclaves under hydrogen pressure in the presence of haematite catalyst. Anthracene oil, having boiling range of 270–360°C, was used as Solvent, whereas sulphur was used as catalyst promoter. It was observed that the yield and quality of Solvent Refined Coal (SRC) was improved substantially by the effect of the catalyst. The yield of SRC from Sirka seam Coal of South Karanpura Coalfield was found to be 94%, while its caking index was 51. Hydrogen requirement was of the order of 1.54% wt/wt of DAF Coal. Recovery of recycle Solvent was found to be about 90% wt/wt of Solvent used in the process.

Ken K Robinson - One of the best experts on this subject based on the ideXlab platform.

  • reaction engineering of direct Coal liquefaction
    Energies, 2009
    Co-Authors: Ken K Robinson
    Abstract:

    Direct Coal liquefaction has been studied and practiced since the 1930s. It was used in Germany during World War II to produce synthetic fuels when there was no oil allowed into the country. Since then, it has been studied in the United States and many different technologies have been investigated. Since the US is rich in Coal resources, this is one way to be energy independent. Most of the development activity occurred in the 1980s and numerous technologies were studied, the most notable of these being H-Coal, Exxon Donor Solvent, Solvent Refined Coal, and Two Stage Liquefaction. The key elements of these technologies, particularly the reaction/reactor scheme, are discussed in this review.

S B Choudhury - One of the best experts on this subject based on the ideXlab platform.

  • Solvent Refined Coal from high ash non weakly coking Coals for use in metallurgical coke making part ii utilization as a coking additive
    Fuel Processing Technology, 1997
    Co-Authors: S B Choudhury, P K Chatterjee, A N Bose, S N Mukherjee, S S Chatterjee, S Sarkar, Rajendra Prasad, S K Ghosh, S R K Rao, B B Brahmachari
    Abstract:

    Abstract Solvent Refined Coal (SRC) prepared from high-ash Indian non/weakly coking Coals, as reported earlier (S.B. Choudhury, B.B. Brahamachari, S.R. Dwivedi, A.K. Roy, P.K. Dasgupta, M. Chakraborty, R. Hague, Solvent Refined Coal from high-ash non-coking Coals/washery middlings for use in metallurgical coke making: part I, Fuel Processing Tech., USA, June '96, pp. 203–213), when blended in small doses (8–12%) with substandard coking blends and carbonised, yields coke with increased anisotropy as well as hot and cold strengths. This is reflected by positive improvement in the values of the Micum indices (M 40 and M 10 ), coke reactivity index (CRI) and the coke strength after reaction with CO 2 (CSR) and also the optical texture of the resultant coke as reported in this paper. The authors confirmed, by pilot scale carbonisation tests (250 kg/batch) that SRC produced by the technology developed (S.B. Choudhury, B.B. Brahamachari, S.R. Dwivedi, A.K. Roy, P.K. Dasgupta, M. Chakraborty, R. Hague, Solvent Refined Coal from high-ash non-coking Coals/washery middlings for use in metallurgical coke making: part I, Fuel Processing Tech., USA, June '96, pp. 203–213) can help in substituting high-fluid low ash prime coking Coals (PCC) to the extent of 30% (by weight). The use of SRC can thus accommodate additional quantum of medium coking Coals (MCC) in the coking blends of the major Indian steel plants. The large reserves of indigenous medium coking Coals, especially low volatile medium coking Coals (LVMC) after beneficiation can also be used in the blends for making blast furnace grade coke thereby conserving scarce prime coking Coals.

  • Solvent Refined Coal from high ash non coking Coals and washery middlings for use in metallurgical coke making part 1 production testing and characterisation
    Fuel Processing Technology, 1996
    Co-Authors: S B Choudhury, S R Dwivedi, P K Dasgupta, B B Brahmachari, A K Roy, M Chakraborty, Rezaul Haque
    Abstract:

    Abstract This paper presents studies on the preparation of a potential coking additive, Solvent-Refined Coal (SRC), from typical high-ash Indian non-coking bituminous Coals, tertiary Assam Coal with a high sulphur content and washery middlings in a bench-scale unit (10 kg h−1 Coal throughput capacity) under hydrogen pressure. The extraction of the Coal samples was conducted under moderate reaction conditions of temperature, pressure and residence time. No external catalyst was used in the process. Pre-beneficiated Coal was used as the feed material and anthracene oil with a boiling range of 270–360°C was used as the Solvent. Rigorous solid separation from the extract slurry by filtration was avoided by centrifugation in a super-decanter centrifuge to produce SRC with an ash content of 6–7%. The yield of SRC from non-coking Samla seam Coal of the Raniganj Coalfield was found to be 85% while its caking index was 44. Substantial improvement in the quality of blast furnace-grade coke was achieved by co-carbonisation of coking blends by mixing only 10% of the SRC prepared from Assam Coal. The hydrogen requirement was low (1.5% wt/wt of d.a.f. Coal) and recovery was of the order of 96% of the Solvent used for the preparation of the Coal-oil slurry. The yield of SRC and its quality as a coking agent are reported, along with the quality of the coke produced using SRC obtained from typical Coal.

Rezaul Haque - One of the best experts on this subject based on the ideXlab platform.

  • Solvent Refined Coal from high ash non coking Coals and washery middlings for use in metallurgical coke making part 1 production testing and characterisation
    Fuel Processing Technology, 1996
    Co-Authors: S B Choudhury, S R Dwivedi, P K Dasgupta, B B Brahmachari, A K Roy, M Chakraborty, Rezaul Haque
    Abstract:

    Abstract This paper presents studies on the preparation of a potential coking additive, Solvent-Refined Coal (SRC), from typical high-ash Indian non-coking bituminous Coals, tertiary Assam Coal with a high sulphur content and washery middlings in a bench-scale unit (10 kg h−1 Coal throughput capacity) under hydrogen pressure. The extraction of the Coal samples was conducted under moderate reaction conditions of temperature, pressure and residence time. No external catalyst was used in the process. Pre-beneficiated Coal was used as the feed material and anthracene oil with a boiling range of 270–360°C was used as the Solvent. Rigorous solid separation from the extract slurry by filtration was avoided by centrifugation in a super-decanter centrifuge to produce SRC with an ash content of 6–7%. The yield of SRC from non-coking Samla seam Coal of the Raniganj Coalfield was found to be 85% while its caking index was 44. Substantial improvement in the quality of blast furnace-grade coke was achieved by co-carbonisation of coking blends by mixing only 10% of the SRC prepared from Assam Coal. The hydrogen requirement was low (1.5% wt/wt of d.a.f. Coal) and recovery was of the order of 96% of the Solvent used for the preparation of the Coal-oil slurry. The yield of SRC and its quality as a coking agent are reported, along with the quality of the coke produced using SRC obtained from typical Coal.

  • studies on blending of Coals for coking using Solvent Refined Coal
    International Conference on Multimedia Information Networking and Security, 1993
    Co-Authors: Deba Prasad Nag, Dinesh Chandra Mitra, Sukumar Banerjee, Krtishna Raja, Rezaul Haque
    Abstract:

    Acute shortage of prime coking Coal in India has resulted in increased use of imported low ash coking Coal in the steel plants. In this context, to maximize use of indigenous coking Coal and to enhance the coking properties of the blend, a suitable coking agent was developed by Solvent refining of Coal. Studies on the influence of Solvent Refined Coal (SRC) addition on the coking properties of various ranks of Gondwana Coals of Indian origin are presented. SRC from non-coking Coal, when used as an additive in the Coal blends, enhanced the coking and plastic properties of the parent Coals/blends. In laboratory scale studies, the beneficial effects of the additives were assessed by the change in coking, swelling and plastic properties. For bench scale studies, 2 kg Coal blend was carbonized and the strength of the resultant coke was determined by micro-tumbler test. The test revealed that in corporation of 10% SRC in the blend can replace 20% of imported coking Coal. Further, pilot scale coking test were also conducted in 250-300 kg capacity electrically heated ovens. The structural characteristics of the coke produced were investigated by X-ray and polarized light microscopy. It is observed that the co-carbonisation of SRC with coking blends increases the size of the optical texture as well as the degree of structural ordering of coke.