The Experts below are selected from a list of 1764 Experts worldwide ranked by ideXlab platform
G J Witkamp - One of the best experts on this subject based on the ideXlab platform.
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cost evaluation of co2 sequestration by aqueous mineral carbonation
Energy Conversion and Management, 2007Co-Authors: W J J Huijgen, Rob N J Comans, G J WitkampAbstract:A cost evaluation of CO2 sequestration by aqueous mineral carbonation has been made using either wollastonite (CaSiO3) or steel slag as feedstock. First, the process was simulated to determine the properties of the streams as well as the power and heat consumption of the process equipment. Second, a basic design was made for the major process equipment, and total investment costs were estimated with the help of the publicly available literature and a factorial cost estimation method. Finally, the sequestration costs were determined on the basis of the depreciation of investments and variable and fixed operating costs. Estimated costs are 102 and 77 €/ton CO2 net avoided for wollastonite and steel slag, respectively. For wollastonite, the major costs are associated with the feedstock and the electricity consumption for grinding and compression (54 and 26 €/ton CO2 avoided, respectively). A sensitivity analysis showed that additional influential parameters in the sequestration costs include the liquid-to-solid ratio in the carbonation reactor and the possible value of the Carbonated Product. The sequestration costs for steel slag are significantly lower due to the absence of costs for the feedstock. Although various options for potential cost reduction have been identified, CO2 sequestration by current aqueous carbonation processes seems expensive relative to other CO2 storage technologies. The permanent and inherently safe sequestration of CO2 by mineral carbonation may justify higher costs, but further cost reductions are required, particularly in view of (current) prices of CO2 emission rights. Niche applications of mineral carbonation with a solid residue such as steel slag as feedstock and/or a useful Carbonated Product hold the best prospects for an economically feasible CO2 sequestration process.
Rob N J Comans - One of the best experts on this subject based on the ideXlab platform.
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cost evaluation of co2 sequestration by aqueous mineral carbonation
Energy Conversion and Management, 2007Co-Authors: W J J Huijgen, Rob N J Comans, G J WitkampAbstract:A cost evaluation of CO2 sequestration by aqueous mineral carbonation has been made using either wollastonite (CaSiO3) or steel slag as feedstock. First, the process was simulated to determine the properties of the streams as well as the power and heat consumption of the process equipment. Second, a basic design was made for the major process equipment, and total investment costs were estimated with the help of the publicly available literature and a factorial cost estimation method. Finally, the sequestration costs were determined on the basis of the depreciation of investments and variable and fixed operating costs. Estimated costs are 102 and 77 €/ton CO2 net avoided for wollastonite and steel slag, respectively. For wollastonite, the major costs are associated with the feedstock and the electricity consumption for grinding and compression (54 and 26 €/ton CO2 avoided, respectively). A sensitivity analysis showed that additional influential parameters in the sequestration costs include the liquid-to-solid ratio in the carbonation reactor and the possible value of the Carbonated Product. The sequestration costs for steel slag are significantly lower due to the absence of costs for the feedstock. Although various options for potential cost reduction have been identified, CO2 sequestration by current aqueous carbonation processes seems expensive relative to other CO2 storage technologies. The permanent and inherently safe sequestration of CO2 by mineral carbonation may justify higher costs, but further cost reductions are required, particularly in view of (current) prices of CO2 emission rights. Niche applications of mineral carbonation with a solid residue such as steel slag as feedstock and/or a useful Carbonated Product hold the best prospects for an economically feasible CO2 sequestration process.
W J J Huijgen - One of the best experts on this subject based on the ideXlab platform.
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cost evaluation of co2 sequestration by aqueous mineral carbonation
Energy Conversion and Management, 2007Co-Authors: W J J Huijgen, Rob N J Comans, G J WitkampAbstract:A cost evaluation of CO2 sequestration by aqueous mineral carbonation has been made using either wollastonite (CaSiO3) or steel slag as feedstock. First, the process was simulated to determine the properties of the streams as well as the power and heat consumption of the process equipment. Second, a basic design was made for the major process equipment, and total investment costs were estimated with the help of the publicly available literature and a factorial cost estimation method. Finally, the sequestration costs were determined on the basis of the depreciation of investments and variable and fixed operating costs. Estimated costs are 102 and 77 €/ton CO2 net avoided for wollastonite and steel slag, respectively. For wollastonite, the major costs are associated with the feedstock and the electricity consumption for grinding and compression (54 and 26 €/ton CO2 avoided, respectively). A sensitivity analysis showed that additional influential parameters in the sequestration costs include the liquid-to-solid ratio in the carbonation reactor and the possible value of the Carbonated Product. The sequestration costs for steel slag are significantly lower due to the absence of costs for the feedstock. Although various options for potential cost reduction have been identified, CO2 sequestration by current aqueous carbonation processes seems expensive relative to other CO2 storage technologies. The permanent and inherently safe sequestration of CO2 by mineral carbonation may justify higher costs, but further cost reductions are required, particularly in view of (current) prices of CO2 emission rights. Niche applications of mineral carbonation with a solid residue such as steel slag as feedstock and/or a useful Carbonated Product hold the best prospects for an economically feasible CO2 sequestration process.
P Francisco - One of the best experts on this subject based on the ideXlab platform.
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dependency of c s h carbonation rate on co2 pressure to explain transition from accelerated tests to natural carbonation
Cement and Concrete Research, 2010Co-Authors: N Hyvert, Alain Sellier, Frederic Duprat, Patrick Rougeau, P FranciscoAbstract:The use of normalized accelerated carbonation tests is currently limited to the classification of concretes in terms of carbonation resistance and the results are not easily transposable to forecasting concrete carbonation in natural conditions. Common models assume that the kinetics of the carbonation front ingress in concrete is a square root function of the CO2 pressure but observations in the field generally invalidate this assumption. Based on an experimental program including carbonation tests at several CO2 pressures, this paper shows that the amount of Carbonated Product depends largely on the CO2 pressure. Several experimental analyses of Carbonated concrete under different pressures are confronted, to finally propose a new analytical model able to predict carbonation ingress in natural conditions using the results of accelerated tests. The model takes both the cement chemical composition and its amount in concrete into account. The carbonation kinetics dependence on CO2 pressure is considered through two underlying functions including, for the first, the dependence of the CSH carbonation rate on the pressure and, for the second, the effect of this additional carbonation on the reduction of the CO2 diffusion coefficient.
N Hyvert - One of the best experts on this subject based on the ideXlab platform.
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dependency of c s h carbonation rate on co2 pressure to explain transition from accelerated tests to natural carbonation
Cement and Concrete Research, 2010Co-Authors: N Hyvert, Alain Sellier, Frederic Duprat, Patrick Rougeau, P FranciscoAbstract:The use of normalized accelerated carbonation tests is currently limited to the classification of concretes in terms of carbonation resistance and the results are not easily transposable to forecasting concrete carbonation in natural conditions. Common models assume that the kinetics of the carbonation front ingress in concrete is a square root function of the CO2 pressure but observations in the field generally invalidate this assumption. Based on an experimental program including carbonation tests at several CO2 pressures, this paper shows that the amount of Carbonated Product depends largely on the CO2 pressure. Several experimental analyses of Carbonated concrete under different pressures are confronted, to finally propose a new analytical model able to predict carbonation ingress in natural conditions using the results of accelerated tests. The model takes both the cement chemical composition and its amount in concrete into account. The carbonation kinetics dependence on CO2 pressure is considered through two underlying functions including, for the first, the dependence of the CSH carbonation rate on the pressure and, for the second, the effect of this additional carbonation on the reduction of the CO2 diffusion coefficient.