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Praveen Linga - One of the best experts on this subject based on the ideXlab platform.
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Semiclathrate hydrate process for Pre-Combustion Capture of CO2 at near ambient temperatures
Applied Energy, 2017Co-Authors: Junjie Zheng, Peng Zhang, Praveen LingaAbstract:Abstract CO 2 Capture has become an important part in building a sustainable energy system featuring the clean use of fossil fuels with low carbon footprint. Hydrate-based gas separation (HBGS) is one of the potential technologies to Capture carbon dioxide from Pre-Combustion (fuel gas) stream. Promoters are often employed to moderate the formation conditions of hydrates. Tetra- n -butylammonium fluoride (TBAF) exhibits great thermodynamic promotion on hydrate formation. In this study the kinetic performance of the formation process of CO 2 -H 2 -TBAF semiclathrate hydrate was evaluated under different experimental pressures (6 MPa, 4 MPa and 2 MPa) and temperatures (298 K, 292 K and 286 K), with the stoichiometric TBAF concentration (3.38 mol%). Gas uptake measurement and visual observations showed that at a given pressure, the total gas uptake decreased with the decrease of experimental temperature due to high mass transfer resistance caused by rapid growth of TBAF hydrate. The highest gas uptake was achieved by experiments conducted at 6.0 MPa and 298.0 K. It was the highest among semiclathrate promoters with stoichiometric concentration, but lower compared with THF. The major advantage of the use of TBAF is that the HBGS process can be operated at near ambient temperatures compared to other promoters. The CO 2 composition in the hydrate phase was between 65.2 and 93.1 mol%, highly dependent on the experimental conditions. Variance analysis was employed to evaluate the impact of pressure and temperature on gas uptake. Gas solubility measurements were conducted to provide further insights into the kinetic performance of CO 2 -H 2 -TBAF semiclathrate hydrate formation.
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A systematic kinetic study to evaluate the effect of tetrahydrofuran on the clathrate process for Pre-Combustion Capture of carbon dioxide
Energy, 2016Co-Authors: Ponnivalavan Babu, Hong Wen Nelson Ong, Praveen LingaAbstract:THF (Tetrahydrofuran) is the most commonly employed promoter for the gas hydrate formation pertaining to applications like carbon dioxide Capture and energy storage (for natural gas and hydrogen). In this work, THF was investigated as a promoter for Pre-Combustion Capture of carbon dioxide (CO2) from fuel gas mixture (CO2/H2) in a systematic manner. 0.5, 1.0, 3.0 and 5.56 mol% THF solution were employed with different driving force conditions to study the effect of pressure, temperature and composition of gases in hydrate. The kinetic performance of the CO2/H2/THF gas hydrate system was evaluated by reviewing the IT (induction time), normalized gas uptake, normalized rate of hydrate formation and the hydrate phase composition. The optimum operating conditions and optimum THF concentration in this study was found to be 6.0 MPa, 282.2 K, and 5.56 mol% THF respectively. 5.56 mol% THF solution yielded an average gas uptake of 13.9 mmol of gas/mol of water for hydrate growth and an average normalized rate of hydrate formation of 1679.8 mmol s-1 m-3.
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a review of the hydrate based gas separation hbgs process for carbon dioxide pre combustion Capture
Energy, 2015Co-Authors: Ponnivalavan Babu, Praveen Linga, Rajnish Kumar, Peter EnglezosAbstract:In this work, a systematic review of the literature work done so far on the use of hydrate crystallization as a basis to develop data for the hydrate based gas separation (HBGS) process for the Capture of CO2 from fuel gas mixtures is presented. Such a gas mixture may arise in integrated gasification combined cycle (IGCC) power plants. A thorough assessment of the thermodynamic, kinetic factors and economic aspects of the HBGS process and critical comments are presented. Compared with competing technologies, high CO2 capacity and the use of water as a solvent are key advantages for the HBGS process for CO2 Capture. Furthermore, in this review, a snapshot of the current state-of-the-art is presented and further research and development opportunities and pathways for commercializing the HBGS process for Pre-Combustion Capture of CO2 from IGCC power plants are discussed.
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The impact of pressure and temperature on tetra-n-butyl ammonium bromide semi-clathrate process for carbon dioxide Capture
Energy Procedia, 2014Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Weng Inn Chin, Praveen LingaAbstract:Abstract The Pre-Combustion Capture of CO 2 in an IGCC power plant employing the hydrate based gas separation (HBGS) process is a novel method currently receiving attention around the world. Tetra-n-butyl ammonium bromide (TBAB) is a promoter that has been shown to improve the efficiency of hydrate formation. In this study, the effect of temperature and pressure on 0.3 mol% TBAB solution is investigated. The induction time for the experiments conducted at 6.0 MPa and 274.8 K was found to be lower, while nucleation became increasingly random as temperature is increased and pressure is reduced. Total gas uptake and normalized rate of hydrate formation (NR 5 ) is also the highest for the experiments conducted at 6.0 MPa and 274.8 K. However, it was found that the hydrate phase CO 2 composition remains relatively constant at both reduced temperatures and pressures.
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Impact of experimental pressure and temperature on semiclathrate hydrate formation for Pre-Combustion Capture of CO2 using tetra-n-butyl ammonium nitrate
Energy, 2014Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Stuti Datta, Praveen LingaAbstract:Abstract TBANO 3 (tetra-n-butyl ammonium nitrate) is a promising liquid phase promoter for capturing CO 2 via HBGS (hydrate based gas separation) technology. In this study, the impact of experimental pressure and temperature on formation of mixed CO 2 –H 2 -TBANO 3 semiclathrate hydrate for the optimum 1.0 mol% TBANO 3 reported by Babu et al. [1] was investigated. Experimental pressures of 3.0, 4.5 and 6.0 MPa and temperatures of 274.2, 276.2 and 278.2 K were employed. Irrespective of the experimental pressure, shorter induction time was observed for experiments conducted at 274.2 K when compared to the experiments at other temperatures. At a given pressure, the total gas uptake increased with increase in experimental temperature. Similarly at a given temperature, the total gas uptake increases with an increase in pressure. Higher rate of hydrate formation was observed at experimental pressure of 6.0 MPa than at 3.0 and 4.5 MPa irrespective of the experimental temperature. The CO 2 composition in hydrate was between 87.5 and 93.2 mol%. Finally, the gas consumption for 1.0 mol% TBANO 3 as promoter was much higher than other promoters of quaternary salts like tetra-n-butyl ammonium bromide and tetra-n-butyl ammonium fluoride at comparable concentration and driving force.
Geoff W. Stevens - One of the best experts on this subject based on the ideXlab platform.
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Simulations of Membrane Gas Separation: Chemical Solvent Absorption Hybrid Plants for Pre- and Post-Combustion Carbon Capture
Separation Science and Technology, 2013Co-Authors: Colin A. Scholes, Robyn Cuthbertson, Clare Anderson, Geoff W. Stevens, Sandra E KentishAbstract:Solvent absorption and membrane gas separation are two carbon Capture technologies that show great potential for reducing emissions from stationary sources such as power plants. Here, plants combining chemical solvent absorption and membrane gas separation are considered for post-combustion Capture as well as Pre-Combustion Capture. In all ASPEN HYSYS simulations the membrane stage initially concentrates CO2 into either the permeate or the retentate stream, which is then passed to a monoethanolamine (MEA) based solvent absorption process. In particular, post-combustion Capture scenarios examined a membrane that is selective for CO2 against N2, while for the Pre-Combustion scenario a H2-selective membrane was studied. It was found the energy demand of the combined hybrid plant was always more than that of a stand alone MEA solvent process. This was mainly due to the need to generate a pressure driving force upstream of the membrane in the post-combustion scenario or to recompress downstream gas streams in ...
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membrane gas separation physical solvent absorption combined plant simulations for pre combustion Capture
Energy Procedia, 2013Co-Authors: Colin A. Scholes, Clare Anderson, Geoff W. Stevens, Sandra E KentishAbstract:Abstract Removal of carbon dioxide (CO 2 ) from syngas generated by coal gasification is often currently achieved by absorption into physical solvents such as in the Rectisol Process. The vented gas from this process often does not have the CO 2 purity required for carbon Capture and storage purposes, because the focus is on recovery and recycling valuable syngas components, such as H 2 . It is shown here that this can be rectified through the use of a CO 2 -selective membrane. For an existing Rectisol process, a CO 2 -selective membrane unit on the vented waste gas can achieve the necessary CO 2 purity with a low CO 2 /H 2 selectivity polymer. This provides a simple and effective method to retrofit such a process to provide a CO 2 stream suitable for storage. Alternatively, the standard multiple flash stages can be replaced by a single flash stage with a gas-separation membrane on the gas recycle. This Rectisol – membrane hybrid design can achieve high purity CO 2 product streams with reasonable membrane CO 2 /H 2 selectivities, dependent on the solvent flash pressure. However, maximizing CO 2 flux across the membrane means a high flashing pressure and therefore only partial solvent regeneration before recycle to the absorber. This results in a significant increase in solvent flowrate and hence absorber size to ensure high CO 2 recovery.
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pre combustion Capture of co2 results from solvent absorption pilot plant trials using 30 wt potassium carbonate and boric acid promoted potassium carbonate solvent
International Journal of Greenhouse Gas Control, 2012Co-Authors: Kathryn H Smith, Abdul Qader, Clare Anderson, Barry Hooper, Sandra E Kentish, Kohei Endo, Kathryn A Mumford, Geoff W. StevensAbstract:Abstract Pre-Combustion Capture of carbon dioxide (CO2) from synthesis gas has been demonstrated using a solvent absorption pilot plant. The plant was designed to Capture 30–50 kg/h (∼1 tonne/day) of CO2 from 300 kg/h of syngas. The solvent used in these trials was a potassium carbonate (K2CO3) solution. Potassium carbonate shows promise as a solvent for CO2 Capture because it requires lower energy for regeneration and has a low environmental impact when compared with the traditional amine-based solvents. However, the rate of CO2 absorption in K2CO3 is slow and as such there have been several studies evaluating rate promoters for this process. Boric acid has been identified as one such promoter. The pilot plant in this study was successfully operated on a campaign basis for 16 days using both an un-promoted 30 wt% K2CO3 solution as well as a 30 wt% K2CO3 solution promoted with 3 wt% boric acid. There was no net improvement in the absorption of CO2 observed in the presence of boric acid. This result is attributed to the boric acid having reduced the pH and therefore OH− concentration of the system, which in turn reduced the rate of the controlling kinetic reaction to form potassium bicarbonate (KHCO3) from CO2. Changes in the solvent physical properties, due to interaction with syngas impurities, were found to influence the hydrodynamic performance of the packed columns. Bicarbonate precipitation and vessel level control issues also led to operational difficulties. ASPEN Plus™ simulations have been developed to predict the performance of the plant. In general the model predicts the performance of the plant well (to within ±5%) and will be important for future process development, design and optimisation.
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Pre-Combustion Capture of CO2—Results from solvent absorption pilot plant trials using 30 wt% potassium carbonate and boric acid promoted potassium carbonate solvent
International Journal of Greenhouse Gas Control, 2012Co-Authors: Kathryn H Smith, Abdul Qader, Clare Anderson, Barry Hooper, Sandra E Kentish, Kohei Endo, Kathryn A Mumford, Wendy Tao, Geoff W. StevensAbstract:Abstract Pre-Combustion Capture of carbon dioxide (CO2) from synthesis gas has been demonstrated using a solvent absorption pilot plant. The plant was designed to Capture 30–50 kg/h (∼1 tonne/day) of CO2 from 300 kg/h of syngas. The solvent used in these trials was a potassium carbonate (K2CO3) solution. Potassium carbonate shows promise as a solvent for CO2 Capture because it requires lower energy for regeneration and has a low environmental impact when compared with the traditional amine-based solvents. However, the rate of CO2 absorption in K2CO3 is slow and as such there have been several studies evaluating rate promoters for this process. Boric acid has been identified as one such promoter. The pilot plant in this study was successfully operated on a campaign basis for 16 days using both an un-promoted 30 wt% K2CO3 solution as well as a 30 wt% K2CO3 solution promoted with 3 wt% boric acid. There was no net improvement in the absorption of CO2 observed in the presence of boric acid. This result is attributed to the boric acid having reduced the pH and therefore OH− concentration of the system, which in turn reduced the rate of the controlling kinetic reaction to form potassium bicarbonate (KHCO3) from CO2. Changes in the solvent physical properties, due to interaction with syngas impurities, were found to influence the hydrodynamic performance of the packed columns. Bicarbonate precipitation and vessel level control issues also led to operational difficulties. ASPEN Plus™ simulations have been developed to predict the performance of the plant. In general the model predicts the performance of the plant well (to within ±5%) and will be important for future process development, design and optimisation.
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novel pre combustion Capture technologies in action results of the co2crc hrl mulgrave Capture project
Energy Procedia, 2011Co-Authors: Clare Anderson, Kathryn H Smith, Abdul Qader, Paul A. Webley, Colin A. Scholes, Geoff W. Stevens, Sandra E Kentish, Barry HooperAbstract:The Mulgrave Capture project, which is funded under the Victorian Government’s Energy Technology Innovation Strategy (ETIS) program, has the objective of demonstrating technologies designed to Capture carbon dioxide (CO2) from synthesis gas (syngas) produced from the air-blown gasification of brown coal. The technologies being investigated include solvent absorption, membrane-based solvent absorption, membrane gas separation and gas adsorption. Each technology was successful in demonstrating Capture of CO2 from syngas during three separate campaigns, which were completed from May 2009 until July 2010. The performance data and operational knowledge obtained from the Mulgrave Capture project will be central to future larger scale project work undertaken by the CO2CRC and partners.
Yutaek Seo - One of the best experts on this subject based on the ideXlab platform.
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Pre-Combustion Capture of CO2 by gas hydrate formation in silica gel pore structure
Chemical Engineering Journal, 2013Co-Authors: Seongpil Kang, Jonghyub Lee, Yutaek SeoAbstract:Abstract This study presents an efficient hydrate-based CO 2 separation process from a binary mixture consisting of 40.3 mol% CO 2 and balanced H 2 , which is a simulated fuel gas from the integrated gasification combined cycle (IGCC), in the presence of porous silica gel particles containing water. According to our previous work (Y. Seo, S.P. Kang, Enhancing CO 2 separation for Pre-Combustion Capture with hydrate formation in silica gel pore structure, Chem. Eng. J. 161 (2010) 308–312), the cage occupancy of CO 2 in mixed gas hydrates with H 2 is enhanced by the use of a silica gel pore structure containing water. Based on that result, a simulated fuel gas is applied to form gas hydrates, and a richer CO 2 containing gas stream is thereby retrieved through dissociation of the hydrates from a single-stage reactor. Equilibrium dissociation pressures of CO 2 + H 2 gas mixtures were measured with silica gel particles with pore sizes of 25, 100, and 250 nm. The effect of CO 2 concentration on equilibrium dissociation pressures was also investigated at a silica gel pore diameter of 100 nm. The results indicate that when a simulated fuel gas has formed in 100 nm silica gel pores, a gas stream containing more than 96 mol% of CO 2 is achieved by one-stage gas hydrate formation in a silica gel pore structure, which is comparable to the result (88–92) from hydrate formation in bulk water. In addition to demonstrating enhanced distribution of CO 2 in coexisting phases, gas hydrate formation in a fixed-bed type reactor charged with silica gel particles containing water in pores is investigated. The formation of gas hydrates in silica gel pores occurred to a high extent and at a high rate, and the proposed method is thus expected to be a promising CO 2 Capture tool for Pre-Combustion.
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enhancing co2 separation for pre combustion Capture with hydrate formation in silica gel pore structure
Chemical Engineering Journal, 2010Co-Authors: Yutaek Seo, Seongpil KangAbstract:Abstract This communication reports the enrichment of the hydrate phase with CO 2 in gas hydrates formed from a CO 2 and H 2 gas mixture when using silica gels to form the hydrate. Phase composition analysis showed that the CO 2 concentrations in the retrieved gas from hydrates were in the range of 96.5 and 98.7 mol% at the range of 6.0–9.2 MPa at 274.15 K in 100 nm silica gel. 13 C NMR spectra supplemented the phase composition analysis and suggested that CO 2 molecules occupy 93% of small cages and 100% of large cages in the hydrate phase. It is noted that the obtained CO 2 -rich hydrate, by implementing a silica gel pore structure, has a composition of (0.14H 2 /1.86 CO 2 ) S ·(6CO 2 ) L ·46H 2 O, which provides the quite promising idea of separating CO 2 from an industrial gas containing H 2 such as shifted synthesis gas, for Pre-Combustion Capture.
Seongpil Kang - One of the best experts on this subject based on the ideXlab platform.
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Pre-Combustion Capture of CO2 by gas hydrate formation in silica gel pore structure
Chemical Engineering Journal, 2013Co-Authors: Seongpil Kang, Jonghyub Lee, Yutaek SeoAbstract:Abstract This study presents an efficient hydrate-based CO 2 separation process from a binary mixture consisting of 40.3 mol% CO 2 and balanced H 2 , which is a simulated fuel gas from the integrated gasification combined cycle (IGCC), in the presence of porous silica gel particles containing water. According to our previous work (Y. Seo, S.P. Kang, Enhancing CO 2 separation for Pre-Combustion Capture with hydrate formation in silica gel pore structure, Chem. Eng. J. 161 (2010) 308–312), the cage occupancy of CO 2 in mixed gas hydrates with H 2 is enhanced by the use of a silica gel pore structure containing water. Based on that result, a simulated fuel gas is applied to form gas hydrates, and a richer CO 2 containing gas stream is thereby retrieved through dissociation of the hydrates from a single-stage reactor. Equilibrium dissociation pressures of CO 2 + H 2 gas mixtures were measured with silica gel particles with pore sizes of 25, 100, and 250 nm. The effect of CO 2 concentration on equilibrium dissociation pressures was also investigated at a silica gel pore diameter of 100 nm. The results indicate that when a simulated fuel gas has formed in 100 nm silica gel pores, a gas stream containing more than 96 mol% of CO 2 is achieved by one-stage gas hydrate formation in a silica gel pore structure, which is comparable to the result (88–92) from hydrate formation in bulk water. In addition to demonstrating enhanced distribution of CO 2 in coexisting phases, gas hydrate formation in a fixed-bed type reactor charged with silica gel particles containing water in pores is investigated. The formation of gas hydrates in silica gel pores occurred to a high extent and at a high rate, and the proposed method is thus expected to be a promising CO 2 Capture tool for Pre-Combustion.
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enhancing co2 separation for pre combustion Capture with hydrate formation in silica gel pore structure
Chemical Engineering Journal, 2010Co-Authors: Yutaek Seo, Seongpil KangAbstract:Abstract This communication reports the enrichment of the hydrate phase with CO 2 in gas hydrates formed from a CO 2 and H 2 gas mixture when using silica gels to form the hydrate. Phase composition analysis showed that the CO 2 concentrations in the retrieved gas from hydrates were in the range of 96.5 and 98.7 mol% at the range of 6.0–9.2 MPa at 274.15 K in 100 nm silica gel. 13 C NMR spectra supplemented the phase composition analysis and suggested that CO 2 molecules occupy 93% of small cages and 100% of large cages in the hydrate phase. It is noted that the obtained CO 2 -rich hydrate, by implementing a silica gel pore structure, has a composition of (0.14H 2 /1.86 CO 2 ) S ·(6CO 2 ) L ·46H 2 O, which provides the quite promising idea of separating CO 2 from an industrial gas containing H 2 such as shifted synthesis gas, for Pre-Combustion Capture.
Sandra E Kentish - One of the best experts on this subject based on the ideXlab platform.
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Simulations of Membrane Gas Separation: Chemical Solvent Absorption Hybrid Plants for Pre- and Post-Combustion Carbon Capture
Separation Science and Technology, 2013Co-Authors: Colin A. Scholes, Robyn Cuthbertson, Clare Anderson, Geoff W. Stevens, Sandra E KentishAbstract:Solvent absorption and membrane gas separation are two carbon Capture technologies that show great potential for reducing emissions from stationary sources such as power plants. Here, plants combining chemical solvent absorption and membrane gas separation are considered for post-combustion Capture as well as Pre-Combustion Capture. In all ASPEN HYSYS simulations the membrane stage initially concentrates CO2 into either the permeate or the retentate stream, which is then passed to a monoethanolamine (MEA) based solvent absorption process. In particular, post-combustion Capture scenarios examined a membrane that is selective for CO2 against N2, while for the Pre-Combustion scenario a H2-selective membrane was studied. It was found the energy demand of the combined hybrid plant was always more than that of a stand alone MEA solvent process. This was mainly due to the need to generate a pressure driving force upstream of the membrane in the post-combustion scenario or to recompress downstream gas streams in ...
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membrane gas separation physical solvent absorption combined plant simulations for pre combustion Capture
Energy Procedia, 2013Co-Authors: Colin A. Scholes, Clare Anderson, Geoff W. Stevens, Sandra E KentishAbstract:Abstract Removal of carbon dioxide (CO 2 ) from syngas generated by coal gasification is often currently achieved by absorption into physical solvents such as in the Rectisol Process. The vented gas from this process often does not have the CO 2 purity required for carbon Capture and storage purposes, because the focus is on recovery and recycling valuable syngas components, such as H 2 . It is shown here that this can be rectified through the use of a CO 2 -selective membrane. For an existing Rectisol process, a CO 2 -selective membrane unit on the vented waste gas can achieve the necessary CO 2 purity with a low CO 2 /H 2 selectivity polymer. This provides a simple and effective method to retrofit such a process to provide a CO 2 stream suitable for storage. Alternatively, the standard multiple flash stages can be replaced by a single flash stage with a gas-separation membrane on the gas recycle. This Rectisol – membrane hybrid design can achieve high purity CO 2 product streams with reasonable membrane CO 2 /H 2 selectivities, dependent on the solvent flash pressure. However, maximizing CO 2 flux across the membrane means a high flashing pressure and therefore only partial solvent regeneration before recycle to the absorber. This results in a significant increase in solvent flowrate and hence absorber size to ensure high CO 2 recovery.
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pre combustion Capture of co2 results from solvent absorption pilot plant trials using 30 wt potassium carbonate and boric acid promoted potassium carbonate solvent
International Journal of Greenhouse Gas Control, 2012Co-Authors: Kathryn H Smith, Abdul Qader, Clare Anderson, Barry Hooper, Sandra E Kentish, Kohei Endo, Kathryn A Mumford, Geoff W. StevensAbstract:Abstract Pre-Combustion Capture of carbon dioxide (CO2) from synthesis gas has been demonstrated using a solvent absorption pilot plant. The plant was designed to Capture 30–50 kg/h (∼1 tonne/day) of CO2 from 300 kg/h of syngas. The solvent used in these trials was a potassium carbonate (K2CO3) solution. Potassium carbonate shows promise as a solvent for CO2 Capture because it requires lower energy for regeneration and has a low environmental impact when compared with the traditional amine-based solvents. However, the rate of CO2 absorption in K2CO3 is slow and as such there have been several studies evaluating rate promoters for this process. Boric acid has been identified as one such promoter. The pilot plant in this study was successfully operated on a campaign basis for 16 days using both an un-promoted 30 wt% K2CO3 solution as well as a 30 wt% K2CO3 solution promoted with 3 wt% boric acid. There was no net improvement in the absorption of CO2 observed in the presence of boric acid. This result is attributed to the boric acid having reduced the pH and therefore OH− concentration of the system, which in turn reduced the rate of the controlling kinetic reaction to form potassium bicarbonate (KHCO3) from CO2. Changes in the solvent physical properties, due to interaction with syngas impurities, were found to influence the hydrodynamic performance of the packed columns. Bicarbonate precipitation and vessel level control issues also led to operational difficulties. ASPEN Plus™ simulations have been developed to predict the performance of the plant. In general the model predicts the performance of the plant well (to within ±5%) and will be important for future process development, design and optimisation.
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Pre-Combustion Capture of CO2—Results from solvent absorption pilot plant trials using 30 wt% potassium carbonate and boric acid promoted potassium carbonate solvent
International Journal of Greenhouse Gas Control, 2012Co-Authors: Kathryn H Smith, Abdul Qader, Clare Anderson, Barry Hooper, Sandra E Kentish, Kohei Endo, Kathryn A Mumford, Wendy Tao, Geoff W. StevensAbstract:Abstract Pre-Combustion Capture of carbon dioxide (CO2) from synthesis gas has been demonstrated using a solvent absorption pilot plant. The plant was designed to Capture 30–50 kg/h (∼1 tonne/day) of CO2 from 300 kg/h of syngas. The solvent used in these trials was a potassium carbonate (K2CO3) solution. Potassium carbonate shows promise as a solvent for CO2 Capture because it requires lower energy for regeneration and has a low environmental impact when compared with the traditional amine-based solvents. However, the rate of CO2 absorption in K2CO3 is slow and as such there have been several studies evaluating rate promoters for this process. Boric acid has been identified as one such promoter. The pilot plant in this study was successfully operated on a campaign basis for 16 days using both an un-promoted 30 wt% K2CO3 solution as well as a 30 wt% K2CO3 solution promoted with 3 wt% boric acid. There was no net improvement in the absorption of CO2 observed in the presence of boric acid. This result is attributed to the boric acid having reduced the pH and therefore OH− concentration of the system, which in turn reduced the rate of the controlling kinetic reaction to form potassium bicarbonate (KHCO3) from CO2. Changes in the solvent physical properties, due to interaction with syngas impurities, were found to influence the hydrodynamic performance of the packed columns. Bicarbonate precipitation and vessel level control issues also led to operational difficulties. ASPEN Plus™ simulations have been developed to predict the performance of the plant. In general the model predicts the performance of the plant well (to within ±5%) and will be important for future process development, design and optimisation.
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novel pre combustion Capture technologies in action results of the co2crc hrl mulgrave Capture project
Energy Procedia, 2011Co-Authors: Clare Anderson, Kathryn H Smith, Abdul Qader, Paul A. Webley, Colin A. Scholes, Geoff W. Stevens, Sandra E Kentish, Barry HooperAbstract:The Mulgrave Capture project, which is funded under the Victorian Government’s Energy Technology Innovation Strategy (ETIS) program, has the objective of demonstrating technologies designed to Capture carbon dioxide (CO2) from synthesis gas (syngas) produced from the air-blown gasification of brown coal. The technologies being investigated include solvent absorption, membrane-based solvent absorption, membrane gas separation and gas adsorption. Each technology was successful in demonstrating Capture of CO2 from syngas during three separate campaigns, which were completed from May 2009 until July 2010. The performance data and operational knowledge obtained from the Mulgrave Capture project will be central to future larger scale project work undertaken by the CO2CRC and partners.