Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology Annual Technical Progress Report October 1 1976 September 1977 54 References written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Work has been carried out to develop and improve several promising methods for desulfurizing and recovering fine-size coal. These methods included froth flotation, selective oil agglomeration, pelletization, and a chemical desulfurization process which involves leaching fine coal with a hot dilute solution of sodium carbonate containing dissolved oxygen or air under pressure. This process is an oxydesulfurization process which utilizes an alkaline solution instead of an acidic solution for leaching coal. The results of experiments with a small autoclave showed that more sulfur, both organic and inorganic, was removed from several high-sulfur bituminous coals when a dilute solution of alkali was used than when a dilute acid solution was used for leaching under the same conditions of time, temperature, and oxygen partial pressure. On the other hand, the heating value recovery was somewhat higher when acidic solutions were used. Also it was shown that pure oxygen is more effective than air, even though the oxygen partial pressure was kept the same, for oxydesulfurization of coal in either acidic or alkaline solutions. In addition it was found that the removal of organic sulfur by alkaline solutions increased as the oxygen partial pressure was raised. Although small concentrations of alkali were beneficial, large concentrations were detrimental. In order to improve the physical separation of coal and pyrite particles by froth flotation or oil agglomeration, various surface chemical treatments were tested. The most successful treatment involved treating the coal or pyrite particles with a warm, dilute alkaline solution which was aerated to provide mildly oxidizing conditions.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1978 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology Quarterly Technical Progress Report October 1 1976 December 31 1976 53 References written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The improvement and technical development of promising methods for desulfurizing and recovering fine coal underway includes froth flotation, selective oil agglomeration, pelletization, and a chemical desulfurization process which involves leaching fine coal with a hot dilute solution of sodium carbonate containing dissolved oxygen under pressure. A preliminary assessment of the state of the art and review of the technical literature has been made. Equipment and apparatus have been assembled for small-scale laboratory experiments in froth flotation, oil agglomeration and chemical desulfurization. Preliminary froth flotation tests have been carried out on an Iowa coal to establish baseline data. Quite unexpectedly these tests indicated that aluminum nitrate may be an activator for coal because it served to increase the recovery of coal. Several potential flotation depressants for pyrite have been screened by measurement at the zeta potential and floatability of pyrite or coal in aqueous suspensions containing the potential depressants. The following reagents show some promise as pyrite depressants: ferric chloride, sodium cyanide, ammonium thiocyanate, and the disodium salt of ethylenediaminetetraacetic acid. Preliminary plans have been prepared for a continuous flow bench-scale system to demonstrate the process. This system will include equipment for grinding and pretreating the coal as well as equipment for demonstrating froth flotation, selective oil agglomeration and pelletization. An investigation of coal microstructure as it relates to coal beneficiation methods has also been initiated. The distribution of various forms of pyrite by size and crystal structure has been determined for two cannel samples of coal through application of scanning electron microscope techniques.
Download or read book Fossil Energy Update written by and published by . This book was released on 1978 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology Quarterly Technical Progress Report April 1 1977 June 30 1977 written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The improvement and technical development of several promising methods for desulfurizing and recovering fine coal were continued. These methods include froth flotation, selective oil agglomeration, pelletization, and a chemical desulfurization process which involves leaching fine coal with a hot dilute solution of sodium carbonate containing dissolved oxygen or air under pressure. Numerous laboratory experiments and measurements were carried out to advance the state of this technology. It was shown that the chemical leaching process removed most of the inorganic sulfur from several high sulfur coals as well as a significant amount of organic sulfur from some of the coals. Higher temperatures and/or oxygen partial pressures resulted in more organic sulfur being removed in some instances. Also it was shown that the rate of conversion of pyrite to soluble sulfates depends on particle size and alkali concentration as well as oxygen partial pressure and flow rate. In addition the effectiveness of a chemical pretreatment step for improving the separation of coal and pyrite by oil agglomeration was demonstrated. Among various fuel oils tested for agglomerating coal, No. 1 or 2 provided greater sulfur reduction than No. 5 or 6. Also the lighter fuel oils seemed better suited to agglomerating finely ground coal. However, No. 6 fuel oil was adapted to the agglomeration of ball milled coal by diluting it with a lighter oil. Construction was started on a bench-scale flow system for demonstrating the beneficiation and recovery of fine-size coal by various methods. Furthermore the suitability of the ASTM method for determining pyritic sulfur in coal was confirmed for certain high volatile C bituminous coals. Confirmation was obtained by scanning electron microscope/energy dispersive x-ray analyses.
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology Quarterly Technical Progress Report January 1 1977 March 31 1977 written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The improvement and technical development of several promising methods for desulfurizing and recovering fine coal was continued. These methods include froth flotation, selective oil agglomeration, pelletization, and a chemical desulfurization process which involves leaching fine coal with a hot dilute solution of sodium carbonate containing dissolved oxygen or air under pressure. Numerous laboratory experiments and measurements were conducted in the areas of froth flotation, selective oil agglomeration and chemical desulfurization. The results showed that when pyrites are leached with an alkaline solution containing dissolved oxygen, the sulfur is extracted in the form of soluble sulfates and the iron is converted to ferric oxide or hematite. It was also shown that the rate of conversion of pyritic sulfur to soluble sulfates depends on the oxygen partial pressure with the rate increasing as the partial pressure is raised. Results which could lead to major improvements in the froth flotation method of separating coal and pyrites included the successful demonstration of an oxidative chemical pretreatment process which would greatly reduce the floatability of pyrite particles without greatly affecting the floatability of coal. Also conditions were identified which would aid in the selection of suitable cationic and anionic flotation collectors for effecting a better separation of coal and pyrite. The discovery that it may be possible to utilize relatively inexpensive, heavy residual fuel oils instead of light distillates for the selective agglomeration of fine coal enhances the economic viability of this method of coal beneficiation.
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology written by Thomas D. Wheelock and published by . This book was released on 1978 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Development of Fine Coal Desulfurization and Recovery Technology written by Ames Laboratory and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bench scale Demonstration of Hot gas Desulfurization Technology Quarterly Technical Progress Report October 1 December 31 1993 written by and published by . This book was released on 1994 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research Triangle Institute (RTI) with DOE/METC sponsorship has been developing zinc titanate sorbent technology since 1986. In addition, RTI has been developing the Direct Sulfur Recovery Process (DSRP) with DOE/METC sponsorship since 1988. Fluidized-bed zinc titanate desulfurization coupled to the DSRP is currently the most advanced and attractive technology for sulfur removal/recovery for IGCC systems, and it has recently been proposed in a Clean Coal Technology project. The goal of this project is to continue further development of the zinc titanate desulfurization and DSRP technologies by: scaling up the zinc titanate reactor system; developing an integrated skid-mounted zinc titanate desulfurization-DSRP reactor system; testing the integrated system over an extended period with real coal-gas from an operating gasifier to quantify the degradative effect, if any, of the trace contaminants present in coal gas; developing an engineering database suitable for system scaleup; and designing, fabricating and commissioning a larger DSRP reactor system capable of operating on a six-fold greater volume of gas than the DSRP reactor used in the bench-scale field test. During this reporting period the Construction Permit Application was completed and approved by the Process Safety Committee, and a final revised Application has been submitted to DOE/METC. A draft Test Plan for the field test was formulated. Finally, progress was made in the reactor system fabrication with the submission of purchase orders for nearly all major equipment, and with the final design of the trailer (mobile laboratory).
Download or read book KVB Coal Desulfurization Process Development Quarterly Technical Progress Report October December 1980 written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second technical progress report for the KVB Coal Desulfurization Process Development. The project is a joint venture between Research-Cottrell, Inc. and the College of Engineering of Rutgers University. The process involves oxidation of the sulfur in coal (both organic and pyritic) to soluble forms using nitrogen oxide gas mixtures and subsequent extractive removal. Key features of the process are mild reaction conditions and the use of a regenerable oxidant. Construction of a bench scale oxidation reactor system was completed and a short experimental program was carried out using Illinois No. 6 coal. An investigation of extraction reagents was also conducted. The emphasis to date has been on development and demonstration of procedures rather than on data generation. However preliminary data do indicate reaction of both organic and pyritic sulfur. Preliminary coal characterization work using x-ray fluorescence is also reported. A brief discussion of project plans in the areas of process modelling and commercial evaluation is also given.
Download or read book Advanced Fuel Gas Desulfurization AFGD Demonstration Project Technical Progress Report No 19 July 1 1994 September 30 1994 written by and published by . This book was released on 1995 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: The {open_quotes}Advanced Flue Gas Desulfurization (AFGD) Demonstration Project{close_quotes} is a $150.5 million cooperative effort between the U.S. Department of Energy and Pure Air, a general partnership of Air Products and Chemicals, Inc. and Mitsubishi Heavy Industries America, Inc. The AFGD process is one of several alternatives to conventional flue gas desulfurization (FGD) being demonstrated under the Department of Energys̀ Clean Coal Technology Demonstration Program. The AFGD demonstration project is located at the Northern Indiana Public Service Companys̀ Bailly Generating Station, about 12 miles northeast of Gary, Indiana.
Download or read book EPA publications bibliography 1977 1983 written by and published by . This book was released on 1983 with total page 1760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA Publications Bibliography written by and published by . This book was released on 1983 with total page 1754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Health and Environmental Effects of Coal Technologies written by Richard Dee Brown and published by . This book was released on 1979 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reliable Affordable and Environmentally Sound Energy for America s Future written by United States. National Energy Policy Development Group and published by Group Publishing (Company). This book was released on 2001 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
