The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform
William J Mcmichael - One of the best experts on this subject based on the ideXlab platform.
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carbon dioxide capture using dry sodium based sorbents
Energy & Fuels, 2004Co-Authors: Ya Liang, Douglas P Harrison, Raghubir P Gupta, David A Green, William J McmichaelAbstract:Electrobalance and fixed-bed reactors have been used to study the capture of CO2 from simulated flue Gas using a regenerable Na2CO3 sorbent. CO2 capture was effective in the temperature range of 60−70 °C, while Regeneration occurred in the range of 120−200 °C, depending on the partial pressure of CO2 in the Regeneration Gas. Equal molar quantities of CO2 and H2O are produced during sorbent Regeneration, and pure CO2 suitable for use or sequestration is available after condensation of the H2O. Capture of as much as 90% of the CO2 was possible at appropriate reaction conditions, and little or no reduction in either carbonation rate or sorbent capacity was observed in limited multicycle tests. The concept is potentially applicable to the capture of CO2 from existing fossil fuel-fired power plants, where amine scrubbing is the only CO2 capture process currently available.
Goldsmith R.l. - One of the best experts on this subject based on the ideXlab platform.
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A regenerable sorbent injection/filtration process for H{sub 2}S removal from hot Gas
CeraMem Corp. Waltham MA (United States), 1996Co-Authors: Higgins R.j., Ji W., Connors M.j., Jones J.f., Goldsmith R.l.Abstract:The operational characteristics of a hot Gas desulfurization process involving regenerable sorbent injection and its subsequent collection with a ceramic filtration device were studied utilizing a bench-scale transport reactor. Hydrogen sulfide removal from simulated hot Gas was evaluated as a function of both zinc oxide-based sorbent physical and chemical characteristics and various process parameters. In addition, the sorbent capture efficiency and regenerability of the ceramic filtration device were evaluated, and Regeneration of sulfided sorbents via injection into an oxidizing Gas was studied. For both sorbent sulfidation and spent sorbent Regeneration, Gas-solid reaction occurred both in the duct and within layers of partially reacted sorbent captured by the ceramic filter. Very high sulfur removal efficiencies were obtained only in highly reducing hot Gas compositions at or above about 700 C, using stoichiometric ratio (defined as ZnO/H{sub 2}S ratio) values of about 1.5, and sorbent particles of about 20 {micro}m or less in diameter. Under such conditions, the experimental data indicated that reaction of H{sub 2}S with zinc vapor formed by reduction of zinc oxide contributed appreciably to sulfur removal. Negligible zinc loss from the hot zone of the reactor was detected, apparently due to rapid formation of zinc sulfide product layers on zinc oxide particles. The ceramic filtration devices captured 100% of all sorbent particles and were fully regenerable over periods of several tens of injection/backpulse cleaning cycles. Spent sorbent could be fully regenerated rapidly at 850 C without problems due to exotherm generation
Ya Liang - One of the best experts on this subject based on the ideXlab platform.
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carbon dioxide capture using dry sodium based sorbents
Energy & Fuels, 2004Co-Authors: Ya Liang, Douglas P Harrison, Raghubir P Gupta, David A Green, William J McmichaelAbstract:Electrobalance and fixed-bed reactors have been used to study the capture of CO2 from simulated flue Gas using a regenerable Na2CO3 sorbent. CO2 capture was effective in the temperature range of 60−70 °C, while Regeneration occurred in the range of 120−200 °C, depending on the partial pressure of CO2 in the Regeneration Gas. Equal molar quantities of CO2 and H2O are produced during sorbent Regeneration, and pure CO2 suitable for use or sequestration is available after condensation of the H2O. Capture of as much as 90% of the CO2 was possible at appropriate reaction conditions, and little or no reduction in either carbonation rate or sorbent capacity was observed in limited multicycle tests. The concept is potentially applicable to the capture of CO2 from existing fossil fuel-fired power plants, where amine scrubbing is the only CO2 capture process currently available.
Higgins R.j. - One of the best experts on this subject based on the ideXlab platform.
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A regenerable sorbent injection/filtration process for H{sub 2}S removal from hot Gas
CeraMem Corp. Waltham MA (United States), 1996Co-Authors: Higgins R.j., Ji W., Connors M.j., Jones J.f., Goldsmith R.l.Abstract:The operational characteristics of a hot Gas desulfurization process involving regenerable sorbent injection and its subsequent collection with a ceramic filtration device were studied utilizing a bench-scale transport reactor. Hydrogen sulfide removal from simulated hot Gas was evaluated as a function of both zinc oxide-based sorbent physical and chemical characteristics and various process parameters. In addition, the sorbent capture efficiency and regenerability of the ceramic filtration device were evaluated, and Regeneration of sulfided sorbents via injection into an oxidizing Gas was studied. For both sorbent sulfidation and spent sorbent Regeneration, Gas-solid reaction occurred both in the duct and within layers of partially reacted sorbent captured by the ceramic filter. Very high sulfur removal efficiencies were obtained only in highly reducing hot Gas compositions at or above about 700 C, using stoichiometric ratio (defined as ZnO/H{sub 2}S ratio) values of about 1.5, and sorbent particles of about 20 {micro}m or less in diameter. Under such conditions, the experimental data indicated that reaction of H{sub 2}S with zinc vapor formed by reduction of zinc oxide contributed appreciably to sulfur removal. Negligible zinc loss from the hot zone of the reactor was detected, apparently due to rapid formation of zinc sulfide product layers on zinc oxide particles. The ceramic filtration devices captured 100% of all sorbent particles and were fully regenerable over periods of several tens of injection/backpulse cleaning cycles. Spent sorbent could be fully regenerated rapidly at 850 C without problems due to exotherm generation
David A Green - One of the best experts on this subject based on the ideXlab platform.
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carbon dioxide capture using dry sodium based sorbents
Energy & Fuels, 2004Co-Authors: Ya Liang, Douglas P Harrison, Raghubir P Gupta, David A Green, William J McmichaelAbstract:Electrobalance and fixed-bed reactors have been used to study the capture of CO2 from simulated flue Gas using a regenerable Na2CO3 sorbent. CO2 capture was effective in the temperature range of 60−70 °C, while Regeneration occurred in the range of 120−200 °C, depending on the partial pressure of CO2 in the Regeneration Gas. Equal molar quantities of CO2 and H2O are produced during sorbent Regeneration, and pure CO2 suitable for use or sequestration is available after condensation of the H2O. Capture of as much as 90% of the CO2 was possible at appropriate reaction conditions, and little or no reduction in either carbonation rate or sorbent capacity was observed in limited multicycle tests. The concept is potentially applicable to the capture of CO2 from existing fossil fuel-fired power plants, where amine scrubbing is the only CO2 capture process currently available.