The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform
Chung Sung Tan - One of the best experts on this subject based on the ideXlab platform.
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Ex Situ CO2 capture by carbonation of steelmaking slag coupled with metalworking wastewater in a rotating packed bed
Environmental Science & Technology, 2013Co-Authors: Shu-yuan Pan, Chung Sung Tan, Pen-chi Chiang, Yi Hung Chen, E E ChangAbstract:Both basic oxygen furnace (BOF) slag and cold-rolling wastewater (CRW) exhibiting highly alkaline characteristics require stabilization and neutralization prior to utilization and/or final disposal. Using CO2 from flue gases as the stabilizing and neutralizing agents could also diminish CO2 emissions. In this investigation, ex situ Hot Stove gas containing 30 vol% CO2 in the steelmaking process was captured by accelerated carbonation of BOF slag coupled with CRW in a rotating packed bed (RPB). The developed RPB process exhibits superior results, with significant CO2 removal efficiency (η) of 96–99% in flue gas achieved within a short reaction time of 1 min at 25 °C and 1 atm. Calcite (CaCO3) was identified as the main product according to XRD and SEM-XEDS observations. In addition, the elimination of lime and Ca(OH)2 in the BOF slag during carbonation is beneficial to its further use as construction material. Consequently, the developed RPB process could capture the CO2 from the flue gas, neutralize the C...
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CO2 capture from Hot Stove gas in steel making process
International Journal of Greenhouse Gas Control, 2010Co-Authors: Hsu-hsiang Cheng, Jui-fu Shen, Chung Sung TanAbstract:Abstract The capture of CO2 from a Hot Stove gas in steel making process containing 30 vol% CO2 by chemical absorption in a rotating packed bed (RPB) was studied. The RPB had an inner diameter of 7.6 cm, an outer diameter of 16 cm, and a height of 2 cm. The aqueous solutions containing 30 wt% of single and mixed monoethanolamine (MEA), 2-(2-aminoethylamino)ethanol (AEEA), and piperazine (PZ) were used. The CO2 capture efficiency was found to increase with increasing temperature in a range of 303–333 K. It was also found to be more dependent on gas and liquid flow rates but less dependent on rotating speed when the speed was higher than 700 rpm. The obtained results indicated that the mixed alkanolamine solutions containing PZ were more effective than the single alkanolamine solutions. This was attributed to the highest reaction rate of PZ with CO2. A higher portion of PZ in the mixture was more favorable to CO2 capture. The highest gas flow rates allowed to achieve a desired CO2 capture efficiency and the correspondent height of transfer unit (HTU) were determined at different aqueous solution flow rates. Because all the 30 wt% single and mixed alkanolamine solutions could result in a HTU less than 5.0 cm at a liquid flow rate of 100 mL/min, chemical absorption in a RPB instead of a packed bed adsorber is therefore suggested to capture CO2 from the flue gases in steel making processes.
E E Chang - One of the best experts on this subject based on the ideXlab platform.
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Ex Situ CO2 capture by carbonation of steelmaking slag coupled with metalworking wastewater in a rotating packed bed
Environmental Science & Technology, 2013Co-Authors: Shu-yuan Pan, Chung Sung Tan, Pen-chi Chiang, Yi Hung Chen, E E ChangAbstract:Both basic oxygen furnace (BOF) slag and cold-rolling wastewater (CRW) exhibiting highly alkaline characteristics require stabilization and neutralization prior to utilization and/or final disposal. Using CO2 from flue gases as the stabilizing and neutralizing agents could also diminish CO2 emissions. In this investigation, ex situ Hot Stove gas containing 30 vol% CO2 in the steelmaking process was captured by accelerated carbonation of BOF slag coupled with CRW in a rotating packed bed (RPB). The developed RPB process exhibits superior results, with significant CO2 removal efficiency (η) of 96–99% in flue gas achieved within a short reaction time of 1 min at 25 °C and 1 atm. Calcite (CaCO3) was identified as the main product according to XRD and SEM-XEDS observations. In addition, the elimination of lime and Ca(OH)2 in the BOF slag during carbonation is beneficial to its further use as construction material. Consequently, the developed RPB process could capture the CO2 from the flue gas, neutralize the C...
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ex situ co2 capture by carbonation of steelmaking slag coupled with metalworking wastewater in a rotating packed bed
Environmental Sciences, 2013Co-Authors: Pen-chi Chiang, Yi Hung Chen, E E ChangAbstract:Both basic oxygen furnace (BOF) slag and cold-rolling wastewater (CRW) exhibiting highly alkaline characteristics require stabilization and neutralization prior to utilization and/or final disposal. Using CO₂ from flue gases as the stabilizing and neutralizing agents could also diminish CO₂ emissions. In this investigation, ex situ Hot Stove gas containing 30 vol% CO₂ in the steelmaking process was captured by accelerated carbonation of BOF slag coupled with CRW in a rotating packed bed (RPB). The developed RPB process exhibits superior results, with significant CO₂ removal efficiency (η) of 96–99% in flue gas achieved within a short reaction time of 1 min at 25 °C and 1 atm. Calcite (CaCO₃) was identified as the main product according to XRD and SEM-XEDS observations. In addition, the elimination of lime and Ca(OH)₂ in the BOF slag during carbonation is beneficial to its further use as construction material. Consequently, the developed RPB process could capture the CO₂ from the flue gas, neutralize the CRW, and demonstrate the utilization potential for BOF slag. It was also concluded that carbonation of BOF slag coupled with CRW in an RPB is a viable method for CO₂ capture due to its higher mass transfer rate and CO₂ removal efficiency in a short reaction time.
Yuan Zeng - One of the best experts on this subject based on the ideXlab platform.
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energy saving and emission reduction technology selection and co2 emission reduction potential of china s iron and steel industry under energy substitution policy
Journal of Cleaner Production, 2019Co-Authors: Xianchun Tan, Jianxin Guo, Yuan ZengAbstract:Abstract The carbonisation of energy structures is a principal reason for the high carbon levels of carbon dioxide (CO2) emissions in the steel industry. The implementation of an energy substitution policy in the Chinese steel industry has important practical significance for this industry in terms of reducing CO2 emissions. Based on this, this paper divides 20 types of energy-saving and emission-reduction (ESER) technologies into 4 categories: coal-saving technology, electricity-saving technology, comprehensive energy-saving technology, and linkage technology according to the energy-saving effect of different technology on energy varieties. Considering the energy substitution constraints on energy structures within the steel industry, we construct a bottom-up optimisation model based on a scenario analysis to analyse the emission reductions under 3 different scenarios: the baseline scenario (BAU), policy scenario (PS), and strengthened policy scenario (SPS). Results show that the emission reduction of coal-saving technology and comprehensive energy-saving technology in 2030 is 102 million tons CO2 (MtCO2) and 129 MtCO2, respectively, in the PS, and 116 MtCO2 and 130 MtCO2, respectively, in the SPS. Compared with these types of technology, electricity-saving technology is maintained at the level of the BAU. Linkage technology is developed in the latter period of the SPS. The emission reduction of linkage technology in the SPS in 2030 will be 4.1 MtCO2. During the period of 2015–2020, priority should be given to the development of thin slab continuous casting technology in comprehensive energy-saving technology and the development of blast furnace thick phase high efficiency coal injection technology in coal-saving technology. During the period 2020–2030, priority should be given to the development of thick layer sintering technology, Hot delivery & Hot charging technology of continuous casting slab, online treatment technology in comprehensive energy-saving technology and low temperature rolling technology, converter ‘negative energy steelmaking’ technology, and double preheating technology for Hot Stove of blast furnace in coal-saving technology.
Hsu-hsiang Cheng - One of the best experts on this subject based on the ideXlab platform.
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CO2 capture from Hot Stove gas in steel making process
International Journal of Greenhouse Gas Control, 2010Co-Authors: Hsu-hsiang Cheng, Jui-fu Shen, Chung Sung TanAbstract:Abstract The capture of CO2 from a Hot Stove gas in steel making process containing 30 vol% CO2 by chemical absorption in a rotating packed bed (RPB) was studied. The RPB had an inner diameter of 7.6 cm, an outer diameter of 16 cm, and a height of 2 cm. The aqueous solutions containing 30 wt% of single and mixed monoethanolamine (MEA), 2-(2-aminoethylamino)ethanol (AEEA), and piperazine (PZ) were used. The CO2 capture efficiency was found to increase with increasing temperature in a range of 303–333 K. It was also found to be more dependent on gas and liquid flow rates but less dependent on rotating speed when the speed was higher than 700 rpm. The obtained results indicated that the mixed alkanolamine solutions containing PZ were more effective than the single alkanolamine solutions. This was attributed to the highest reaction rate of PZ with CO2. A higher portion of PZ in the mixture was more favorable to CO2 capture. The highest gas flow rates allowed to achieve a desired CO2 capture efficiency and the correspondent height of transfer unit (HTU) were determined at different aqueous solution flow rates. Because all the 30 wt% single and mixed alkanolamine solutions could result in a HTU less than 5.0 cm at a liquid flow rate of 100 mL/min, chemical absorption in a RPB instead of a packed bed adsorber is therefore suggested to capture CO2 from the flue gases in steel making processes.
James G March - One of the best experts on this subject based on the ideXlab platform.
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adaptation as information restriction the Hot Stove effect
Organization Science, 2001Co-Authors: Jerker Denrell, James G MarchAbstract:Individuals and social systems are often portrayed as risk averse and resistant to change. Such propensities are characteristically attributed to individual, organizational, and cultural traits such as risk aversion, uncertainty-avoidance, discounting, and an unwillingness to change. This paper explores an alternative interpretation of such phenomena. We show how the reproduction of successful actions inherent in adaptive processes, such as learning and competitive selection and reproduction, results in a bias against alternatives that initially may appear to be worse than they actually are. In particular, learning and selection are biased against both risky and novel alternatives. Because the biases are products of the tendency to reproduce success that is inherent in the sequential sampling of adaptation, they are reduced whenever the reproduction of success is attenuated. In particular, when adaptation is slowed, made imprecise, or recalled less reliably, the propensity to engage in risky and new activities is increased. These protections against the error of rejecting potentially good alternatives on inadequate experiential evidence are costly, however. They increase the likelihood of persisting with alternatives that are poor in the long run as well as in the short run.