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Sulfur Removal In Advanced Two Stage Pressurized Fluidized Bed Combustion Technical Report March 1 May 31 1995
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Book Synopsis Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, March 1--May 31, 1995 by :
Download or read book Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, March 1--May 31, 1995 written by and published by . This book was released on 1995 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to obtain data on the rates and the extent of sulfation reactions involving partially sulfided calcium-based sorbents, and oxygen as well as sulfur dioxide, at operating conditions closely simulating those prevailing in the second stage (combustor) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors. In these systems the CO2 partial pressure generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, calcium sulfate is produced through the reactions between SO2 and calcium carbonate as well as the reaction between calcium sulfide and oxygen. To achieve this objective, the rates of reaction involving SO2 and oxygen, calcium sulfide and calcium carbonate will be determined by conducting tests in a pressurized thermogravimetric analyzer unit. The sulfate tests conducted during this quarter, focused on the determination of the rate of sulfation reaction involving partially sulfided half-calcined dolomite and oxygen. The test parameters included CO2 and O2 concentrations, reaction temperature and pressure, as well as the sorbent particle size. The results obtained during this quarter suggest that the rate of sulfation reaction involving partially sulfided half-calcined dolomite and oxygen is very fast at temperatures above 850 C which rapidly increases with increasing temperature, achieving more than 85% conversion in less than a few minutes. The reaction appears to continue to completion, however, above 85% conversion, the rate of reaction appears to be low, requiring long residence time to reach complete conversion.
Book Synopsis Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, 1 March--31 May 1994 by :
Download or read book Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, 1 March--31 May 1994 written by and published by . This book was released on 1994 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to obtain data on the rates of reaction between hydrogen sulfide (H2S) and uncalcined calcium-based sorbents under operating conditions relevant to first stage (carbonizer) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors (PFBC). In these systems the CO2 partial pressure in the first stage generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, removal of sulfur compounds takes place through the reaction between H2S and calcium carbonate. To achieve this objective, the rates of reaction between hydrogen sulfide and uncalcined calcium-based sorbents will be determined by conducting tests in pressurized thermogravimetric analyzer (TGA) and high-pressure/high-temperature fluidized-bed reactor (HPTR) units. The effects of sorbent type, sorbent particle size, reactor temperature and pressure, and CO2 and H2S partial pressures on the sulfidation reaction rate will be determined. During this quarter a series of sulfidation tests were conducted in the high-pressure/high-temperature fluidized-bed reactor (HPTR) units. The effects of sorbent type, sorbent particle size, reactor temperature and pressure, and CO2 and H2S partial pressures on the sulfidation reaction rate will be determined. During this quarter a series of sulfidation tests were conducted in the high-pressure high-temperature thermogravimetric analyzer (HPTGA unit) using limestone and dolomite. The results suggest that half-calcined dolomite is much more reactive than uncalcined limestone. Also, temperature in the range of 800 to 950 C did not significantly affect the sulfidation reaction rates for both limestone and dolomite.
Book Synopsis Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, December 1, 1994--February 28, 1995 by :
Download or read book Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, December 1, 1994--February 28, 1995 written by and published by . This book was released on 1996 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to obtain data on the rates and the extent of sulfation reactions involving partially sulfided calcium-based sorbents, and oxygen as well as sulfur dioxide, at operating conditions closely simulating those prevailing in the second stage (combustor) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors (PFBC). In these systems the CO2 partial pressure generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, calcium sulfate is produced through the reactions between SO2 and calcium carbonate as well as the reaction between calcium sulfide and oxygen. To achieve this objective, the rates of reaction involving SO2 and oxygen (gaseous reactant); and calcium sulfide and calcium carbonate (solid reactants), will be determined by conducting tests in a pressurized thermogravimetric analyzer (HPTGA) unit. The effects of sorbent type, sorbent particle size, reactor temperature and pressure; and O2 as well as SO2 partial pressures on the sulfation reactions rate will be determined. During this quarter, samples of the selected limestone and dolomite, sulfided in the fluidized-bed reactor during last quarter, were analyzed. The extent of sulfidation in these samples was in the range of 20 to 50%, which represent carbonizer discharge material at different operating conditions. The high pressure thermogravimetric analyzer (BPTGA) unit has been modified and a new pressure control system was installed to eliminate pressure fluctuation during the sulfation tests.
Book Synopsis Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, September 1--November 30, 1994 by :
Download or read book Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion. Technical Report, September 1--November 30, 1994 written by and published by . This book was released on 1994 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to obtain data on the rates and the extent of sulfation reactions involving partially sulfided calcium-based sorbents, and oxygen as well as sulfur dioxide, at operating conditions closely simulating those prevailing in the second stage (combustor) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors (PFBC). In these systems the CO2 partial pressure generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, calcium sulfate is produced through the reactions between SO2 and calcium carbonate as well as the reaction between calcium sulfide and oxygen. To achieve this objective, the rates of reaction involving SO2 and oxygen (gaseous reactant); and calcium sulfide and calcium carbonate (solid reactants), will be determined by conducting tests in a pressurized thermogravimetric analyzer (HPTGA) unit. The effects of sorbent type, sorbent particle size, reactor temperature and pressure; and O2 as well as SO2 partial pressures on the sulfation reactions rate will be determined. During this quarter, samples of the selected limestone and dolomite were sulfided in the fluidized-bed reactor. These tests were conducted in both calcining and non-calcining operating conditions to produce partially-sulfided sorbents containing calcium oxide and calcium carbonate, respectively. These samples which represent the carbonizer discharge material, will be used as the feed material in the sulfation tests to be conducted in the HPTGA unit during the next quarter.
Book Synopsis Sulfur Removal in Advanced Two-stage Fluidized-bed Combustion. [Quarterly] Technical Report, December 1, 1993--February 28, 1994 by :
Download or read book Sulfur Removal in Advanced Two-stage Fluidized-bed Combustion. [Quarterly] Technical Report, December 1, 1993--February 28, 1994 written by and published by . This book was released on 1994 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to obtain data on the rates of reaction between, hydrogen sulfide (H2S) and uncalcined calcium-based sorbents under operating conditions relevant to first stage (carbonizer) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors (PFBC). In these systems the CO2 partial pressure in the first stage generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, removal of sulfur compounds takes place through the reaction between H2S and calcium carbonate. To achieve this objective the rates of reaction between hydrogen sulfide and uncalcined calcium-based sorbents will be determined by conducting tests in pressurized thermogravimetric analyzer (TGA) and high-pressure/high-temperature fluidized-bed reactor (HPTR) units. The effects of sorbent type, sorbent particle size, reactor temperature and pressure, and CO2 and H2S partial pressures on the sulfidation reaction rate will be determined. During this quarter, the high-pressure thermogravimetric analyzer (HPTGA) unit was installed and the shakedown process was completed. Several tests were conducted in the HPTGA unit to establish the operating procedure and the repeatability of the experimental results. Sulfidation by conducting the baseline sulfidation tests. The results are currently being analyzed.
Book Synopsis Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion by :
Download or read book Sulfur Removal in Advanced Two Stage Pressurized Fluidized Bed Combustion written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sulfur Removal in Advanced Two-staged Pressurized Fluidized-bed Combustion ; [Quarterly] Report, September 1--November 1993 by :
Download or read book Sulfur Removal in Advanced Two-staged Pressurized Fluidized-bed Combustion ; [Quarterly] Report, September 1--November 1993 written by and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to obtain data on the rates of reaction between hydrogen sulfide (H2S) and uncalcined calcium-based sorbents under operating conditions relevant to first stage (carbonizer) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors (PFBC). In these systems the CO2 partial pressure in the first stage generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, removal of sulfur compounds takes place through the reaction between H2S and calcium carbonate. To achieve this objective, the rates of reaction between hydrogen sulfide and uncalcined calcium-based sorbents will be determined by conducting tests in pressurized thermogravimetric analyzer (TGA) and high-pressure/high-temperature fluidized-bed reactor (HPTR) units. The effects of sorbent type, sorbent particle size, reactor temperature and pressure, and CO2 and H2S partial pressures on the sulfidation reaction rate will be determined. A pressurized TGA unit has been purchased by IGT for use in this project.
Book Synopsis Sulfur Removal in Advanced Two-stage Fluidized-bed Combustion by :
Download or read book Sulfur Removal in Advanced Two-stage Fluidized-bed Combustion written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nitrogen oxides (NOx) why and how they are controlled by :
Download or read book Nitrogen oxides (NOx) why and how they are controlled written by and published by DIANE Publishing. This book was released on 1999 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mild Temperature Gasification written by and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bench-scale, mild temperature fluidized bed gasification (MTFBG) will be performed on three high sulfur Illinois basin coals after mixing with phosphoric acid. The research initiates development of an advanced processing technology which partitions coal sulfur to the gas phase as H2S. Influences of coal type, coal agglomeration, and steam injection on the properties of the solid, condensible and gaseous products produced during MTFBG will be examined. Analytical measurements of the products will be obtained and are designed to provide product quality and quantity data. Combustion reactivity testing of the char, and pressurized, hot water extraction of H3PO4 from the char, will be performed to provide information for design of a continuous and integrated process for the removal and recovery of coal sulfur. MTFBG experiments were performed on Illinois coals IBC-101, -106 and -110. The yields of char, tar and gaseous products varied between 60--85% char, 0.4--1.3% tar, and 15--43% gas for IBC-101 and -106. Gas yields were sensitive to the coal/phosphoric acid mixing ratio and also dependent on the residence time within the gasifier. The mean residence time was low ((approximately)6 seconds), and was influenced by the mean particle size of the coals. The total sulfur removal was as high as 83% for IBC-106 at a temperature of 500°C. In comparison with previous fixed bed testing, it is believed that the sulfur is removed as H2S. Experiments planned for the next quarter should define the concentration and type of sulfur in the gas.
Book Synopsis Hot Gas Particulate Filtration by : Stuart C. Mitchell
Download or read book Hot Gas Particulate Filtration written by Stuart C. Mitchell and published by . This book was released on 1997 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sulfur removal in fluidized-bed combustion by : John L. Little
Download or read book Sulfur removal in fluidized-bed combustion written by John L. Little and published by . This book was released on 1977 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Sulfur Control Concepts for Hot Gas Desulfurization Technology. Quarterly Report, January 1--March 31, 1997 by :
Download or read book Advanced Sulfur Control Concepts for Hot Gas Desulfurization Technology. Quarterly Report, January 1--March 31, 1997 written by and published by . This book was released on 1997 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Favorable results were achieved in the sulfidation of CeO2 by H2S and the regeneration of Ce2O2S by SO2. Successful removal of approximately 99% of the H2S from the sulfidation gas to levels of about 100 ppmv (or lower), and the production of approximately 12% elemental sulfur (as S2) in the regeneration product gas were highlights. Final effort in the preliminary phase included a ten-cycle test at standard sulfidation and regeneration conditions with little or no sorbent deterioration. In the initial test of the detailed experimental phase of the program, the authors investigated the effect of temperature on the regeneration reaction. Results of preliminary tests showed that the Ce2O2S-SO2 reaction did not occur at 350 C, and all subsequent regeneration tests were at 600 C where the reaction was rapid. Significant progress has been made on the process analysis effort during the quarter. Detailed process flow diagrams along with material and energy balance calculations for six design case studies were completed in the previous quarter. Two of the cases involved two-stage desulfurization with steam regeneration, three used two-stage desulfurization with SO2 regeneration, and the sixth was based on single-stage desulfurization with elemental sulfur recovery using the DSRP concept. In the present quarter, major process equipment was sized for each of the six cases. Preliminary annual operating and levelized total cost estimates were then completed for two design cases--one involving two-stage desulfurization with SO2 regeneration and the second based on single-stage desulfurization with DSRP.
Book Synopsis Feasibility of Utilizing a Rotating Fluidized Bed for the Removal of Sulfur from Hot Gases. Progress Report by :
Download or read book Feasibility of Utilizing a Rotating Fluidized Bed for the Removal of Sulfur from Hot Gases. Progress Report written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The RFB provides an option for coal combustion systems by separating the desulfurization of hot combustion product gases from the combustion process itself. Fluid-bed combustors conventionally combine the two processes and, as a result, the rapid combustion process is carried out in equipment whose design is dominated by the requirements of the slower and temperature-specific desulfurization process. Neither process can be optimized and, in fact, the specifics of the combined reaction chemistry are unclear. Separation of the processes allows consideration of alternative combustors, sorbents, and sorption devices. The RFB desulfurizer has the potential to reduce equipment sizes through improvements in reaction rates and sorbent utilization. Additionally, separation of the combustion and sorption reactions leads to a relatively clean separation of ash and spent sorbent allowing for better waste utilization or disposal. Several process advantages are associated with the use of the rotating rather than the stationary fluidized bed for sulfur removal. These stem primarily from two characteristics inherent in the multi-g system. First, smaller particles can be retained in the fluidized bed, with the following three important advantages: (a) Smaller particles will contribute to higher sulfation rates because of increased surface area; the better rates will lead to a shorter gas residence time; (b) Greater sorbent utilization will occur. Sulfation causes the buildup of a product layer on the outside of the sorbent particles, which corresponds to a higher fraction of sorbent utilization in the case of a small particle than with a larger particle; (c) The low gas velocities possible in the fluidization of small particles will permit relatively long residence times.
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