A Calcium Oxide Sorbent Process for Bulk Separation of Carbon Dioxide. Annual Report, September 1989--August 1990 PDF Download
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Languages : en
Pages : 100
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This research effort is designed to investigate the technical feasibility of a high-temperature, high-pressure process for the bulk separation of CO2 from coal-derived gases. The two-year contract was awarded in September 1989. This report describes the research effort and results obtained during the first year of the effort. The overall project consists of 6 tasks, four of which were active during year 01. Tasks 1 and 2 were completed during the year while activity in Tasks 3 and 6 will carry over into year 02. Tasks 4 and 5 will be initiated during year 02. Three primary objectives were met in Task 1. A literature search on the calcination-carbonation reactions of CO2 with calcium-based sorbents was completed. A high temperature, high pressure (HTHP) electrobalance reactor suitable for studying the calcination and carbonation reactions was constructed. This reactor system is now fully operable and we are routinely collecting kinetics data at temperatures in the range of 550-900°C and pressures of 1 to 15 atm. Samples of nine candidate calcium-based sorbents were acquired and tested. These samples were subjected to reaction screening tests as part of Task 2. As a result of these screening tests, chemically pure calcium carbonate, chemically pure calcium acetate, and the commercial dolomite were selected for more detailed kinetic testing. In Task 3, the HTHP electrobalance reactor is being used to study the calcination-carbonation behavior of the three base sorbents as a function of calcination temperature, carbonation temperature, carbonation pressure, and CO2 concentration.
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Category :
Languages : en
Pages : 100
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This research effort is designed to investigate the technical feasibility of a high-temperature, high-pressure process for the bulk separation of CO2 from coal-derived gases. The two-year contract was awarded in September 1989. This report describes the research effort and results obtained during the first year of the effort. The overall project consists of 6 tasks, four of which were active during year 01. Tasks 1 and 2 were completed during the year while activity in Tasks 3 and 6 will carry over into year 02. Tasks 4 and 5 will be initiated during year 02. Three primary objectives were met in Task 1. A literature search on the calcination-carbonation reactions of CO2 with calcium-based sorbents was completed. A high temperature, high pressure (HTHP) electrobalance reactor suitable for studying the calcination and carbonation reactions was constructed. This reactor system is now fully operable and we are routinely collecting kinetics data at temperatures in the range of 550-900°C and pressures of 1 to 15 atm. Samples of nine candidate calcium-based sorbents were acquired and tested. These samples were subjected to reaction screening tests as part of Task 2. As a result of these screening tests, chemically pure calcium carbonate, chemically pure calcium acetate, and the commercial dolomite were selected for more detailed kinetic testing. In Task 3, the HTHP electrobalance reactor is being used to study the calcination-carbonation behavior of the three base sorbents as a function of calcination temperature, carbonation temperature, carbonation pressure, and CO2 concentration.
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Category : Power resources
Languages : en
Pages : 654
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Languages : en
Pages : 25
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Phase I research, in which an electrobalance reactor was used to establish the technical feasibility of the regenerable sorbent process, was completed in March 1992 and results have been fully described in earlier quarterly reports. In Phase I, the calcination and carbonation characteristics of three calcium sorbents were studied as a function of calcination and carbonation temperature and pressure, mol fraction CO2 in the carbonation gas, and carbonation background gas composition. Desirable reaction conditions required for high reactivity and good sorbent durability were determined. Multicycle tests consisting of as many as ten complete calcination and carbonation cycles were completed. Indirect evidence which suggested that the water-gas shift reaction occurred simultaneously with CO2 removal was found. Occurrence of the simultaneous reactions created the possibility of a direct one-step process for the manufacture of hydrogen from coal-gas while at the same time separating a concentrated stream of CO2. The concentrated CO2 stream could be quite significant if, in the future, environmental regulations restrict atmospheric CO2 emissions.
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Languages : en
Pages :
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Category : Research
Languages : en
Pages : 1190
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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
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Category :
Languages : en
Pages :
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Category :
Languages : en
Pages :
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Category :
Languages : en
Pages : 37
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Objective is to investigate the removal of CO2 from a fuel gas produced by a coal gasifier with a K2CO3-modified MgO sorbent. The work consists of measuring the capacity and rates of absorption of the sorbent vs T, P, and gaseous contaminants. Effects of repeated absorption/desorption cycling on sorbent properties will be studied. During this first quarter, the Test Plan was prepared and approved. The thermobalance was prepared, and the first sorbent batch was formulated and subjected to adsorption/desorption thermobalance tests (results showed CO2 absorption at 800 F above 400 psi).
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Category : Science
Languages : en
Pages : 1094
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Languages : en
Pages : 11
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During the sixth quarter of this program, work continued on the preparation of homogeneous batches of sorbent. It had previously been found that there was not consistent agreement between the Mg/K ratios calculated from the amounts of reagents used and the ratios determined by chemical analysis using atomic absorption spectrometry. In our investigation of the causes of these inconsistencies, we also found that there was an unacceptably high variation in the Mg/K ratio among the individual sorbent pellets. This quarter, sorbent pellets that had shown excessive variation in the Mg/K ratio were ground and the powder mixed to produce a uniform material. This material was then pelletized with a compaction device and the pellets checked for composition and reactivity. Although this procedure produced pellets with consistent Mg/K ratios, thermobalance tests showed reduced reactivity.
