从生命周期角度出发,对煤制乙二醇(coal to ethylene glycol,CTEG)路线和天然气制乙二醇(natural gas to ethylene glycol,NGTEG)路线进行全面的技术、碳排放与经济对比分析。结果表明,CTEG路线单位产品能耗是NGTEG路线的1.5倍,单位产...从生命周期角度出发,对煤制乙二醇(coal to ethylene glycol,CTEG)路线和天然气制乙二醇(natural gas to ethylene glycol,NGTEG)路线进行全面的技术、碳排放与经济对比分析。结果表明,CTEG路线单位产品能耗是NGTEG路线的1.5倍,单位产品碳排放是NGTEG路线的1.6倍。然而,CTEG路线具有较好的经济效益,利润与投资回报率分别比NGTEG路线高1499元/t和3.4%。通过分析原料、燃料和产品价格波动对2条路线经济竞争力的影响,发现CTEG路线受3种价格波动影响较小。CTEG路线具有良好的发展前景,但必须通过技术进步解决高能耗和高碳排放问题。展开更多
The influence of a pre-oxidation process on the chemical properties of crushed bituminous coal and on adsorption properties of the subsequently formed char and activated carbon is discussed in this paper. Datong bitum...The influence of a pre-oxidation process on the chemical properties of crushed bituminous coal and on adsorption properties of the subsequently formed char and activated carbon is discussed in this paper. Datong bituminous coal samples sized 6 mm were oxidized at different temperatures and for different times and then carbonized and activated by steam to obtain activated carbons. A Uniform Design method was used to arrange the experiments,IR and adsorption experiments were used to characterize these oxidized coals,chars and activated carbon samples. The results show that the carboxyl group disappeared and α-CH2 groups joined to alkenes decreased dramatically but the carbonyl group clearly increased in the coal sample oxidized at 543 K; The chemical composition of coal samples oxidized at lower temperature is different from that of coal oxidized at 543 K. Oxidizing coal samples at higher temperatures for a short time or at lower temperatures for a longer time resulted in activated carbon samples that tended toward the same adsorption properties: Iodine number 1100 mg/g and Methylene blue value 252 mg/g. The yield of activated carbon obtained from the pre-oxidized coal is 10% higher than the yield from parent coal but the activated carbons have the same adsorption properties.展开更多
文摘从生命周期角度出发,对煤制乙二醇(coal to ethylene glycol,CTEG)路线和天然气制乙二醇(natural gas to ethylene glycol,NGTEG)路线进行全面的技术、碳排放与经济对比分析。结果表明,CTEG路线单位产品能耗是NGTEG路线的1.5倍,单位产品碳排放是NGTEG路线的1.6倍。然而,CTEG路线具有较好的经济效益,利润与投资回报率分别比NGTEG路线高1499元/t和3.4%。通过分析原料、燃料和产品价格波动对2条路线经济竞争力的影响,发现CTEG路线受3种价格波动影响较小。CTEG路线具有良好的发展前景,但必须通过技术进步解决高能耗和高碳排放问题。
基金Project 50204011 supported by the National Natural Science Foundation of China
文摘The influence of a pre-oxidation process on the chemical properties of crushed bituminous coal and on adsorption properties of the subsequently formed char and activated carbon is discussed in this paper. Datong bituminous coal samples sized 6 mm were oxidized at different temperatures and for different times and then carbonized and activated by steam to obtain activated carbons. A Uniform Design method was used to arrange the experiments,IR and adsorption experiments were used to characterize these oxidized coals,chars and activated carbon samples. The results show that the carboxyl group disappeared and α-CH2 groups joined to alkenes decreased dramatically but the carbonyl group clearly increased in the coal sample oxidized at 543 K; The chemical composition of coal samples oxidized at lower temperature is different from that of coal oxidized at 543 K. Oxidizing coal samples at higher temperatures for a short time or at lower temperatures for a longer time resulted in activated carbon samples that tended toward the same adsorption properties: Iodine number 1100 mg/g and Methylene blue value 252 mg/g. The yield of activated carbon obtained from the pre-oxidized coal is 10% higher than the yield from parent coal but the activated carbons have the same adsorption properties.
