Advanced Sulfur Control Concepts for Hot Gas Desulfurization Technology. Quarterly Report, October-December 1994 PDF Download
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Languages : en
Pages : 22
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Pages : 59
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Good progress was made on both the experimental and process modelling fronts during the past quarter. All experimental tests used the fixed-bed laboratory reactor to study the sulfidation of CeO2 with H2S and the regeneration of Ce2O2S using SO2. A number of experimental problems were solved (or at least alleviated) during the quarter including malfunctioning mass flow controllers, excessive bed pressure drop, and elimination of the H2S plateau during early stages of sulfidation tests. Most CeO2 sulfidation tests were carried out a 800°C and 5 atm using a sulfidation gas containing 1% H2S, 10 % H2, balance N2. At these conditions sulfidation of CeO2 was rapid and complete. Sulfur material balance closure was satisfactory, and, except for the unexpected H2S plateau during the prebreakthrough period, the sulfidation results were as expected. Near the end of the quarter, the cause of the H2S plateau was tentatively identified as being due to reaction between H2 and elemental sulfur deposited downstream of the sorbent in the bottom of the reactor and in tubing leading to the gas chromatograph. The sulfur deposits occurred during regeneration tests, and chemically cleaning the lines between regeneration and sulfidation coupled with reducing the temperature of the transfer line during sulfidation greatly reduced the H2S plateau. A brief examination of the effect of sulfidation temperature between 700 and 850°C showed relatively little temperature effect, although the slope of the active portion of the breakthrough curve was somewhat smaller at 700°C, which is consistent with a smaller reaction rate at this temperature.
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Languages : en
Pages : 31
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In the area of gas analysis, most of the attention during the past quarter was devoted to gaining an understanding of the operation of the Antek total sulfur analyzer, and making appropriate modifications in the unit. The primary problem is that the resistance of the capillary flow restrictor is not large enough, and the amount of sulfur which reaches the UV-analyzer results in the analyzer becoming saturated. We have added a N2 diluent flow downstream of the pyrotube tube which, we believe, will permit the unit to be operated at pressures to about 50 psig. Use of larger diluent flow rates to permit higher pressure operation is not feasible since larger diluent rates increase the back pressure on the quartz pyrotube (which operates at 1050°C) to unsafe levels. In the meantime, Antek is studying the redesign of the capillary flow restrictor to provide larger flow resistance. Studies on the regeneration of FeS in the atmospheric pressure reactor were almost completed during the quarter. Only a series of multicycle sulfidation-regeneration tests remains. The effects of reactive gas mol fraction and temperature have been examined using both O2/N2 and H2O/N2 atmospheres. The initial rate of regeneration was found to be a weak function of temperature and first-order in both O2 and H2O concentration. In a test series in which the reactive gas contained both O2 and H2O, the experimental initial rate was effectively equal to the sum of the individual initial rates, suggesting that the two reactions proceed independently of one another. Detailed correlation and statistical analysis of the data is currently being done. Principal effort during the quarter using the high pressure electrobalance was devoted to studying the regeneration of FeS in a H2O/N2 atmosphere.
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Languages : en
Pages : 27
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The primary objective of this research project is the direct production of elemental sulfur during the regeneration of known high temperature desulfurization sorbents. The contract was awarded to LSU on April 12, 1994, and this quarterly report covers accomplishments during the first 2 1/2 months of the project. Effort during the initial 2 1/2 month period has been limited to Tasks 1 and 2, and involves a search of the literature to identify concepts for producing elemental sulfur during regeneration of known metal oxide sorbents and a thermodynamic evaluation of these concepts. While searching and evaluating the literature is a continuing process, concentrated effort on that phase is now complete and a detailed summary is included in this report. Three possible concepts for the direct production of elemental sulfur were identified in the LSU proposal, and the literature search has not uncovered any additional concepts. Thus, the three concepts being investigated involve: (1) regeneration with SO2, (2) regeneration with mixtures Of 02 and H2O, and (3) regeneration with H2O. While concept (3) directly produces H2S instead of elemental sulfur, the concept is included because the possibility exists for converting H2S to elemental sulfur using the Claus process. Each of the concepts will ultimately be compared to the Direct Sulfur Recovery Process (DSRP) under development by RTI. DSRP involves initial sorbent regeneration to SO2, and the inclusion of additional processing steps to reduce the SO2 to elemental sulfur.
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Category : Power resources
Languages : en
Pages : 782
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