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典型现代煤化工过程的二氧化碳排放比较

         

摘要

基于低碳经济发展的要求,对几种典型煤化工过程中的 CO2排放情况进行了分析,提出科学比较现代煤化工过程的 CO2排放量。对于煤制烯烃、煤制乙二醇等煤基化学品而言,使用单位热值 CO2排放量作为评价指标并不合适。基于煤基燃料产品和化学品的不同特点,结合我国碳排放强度的控制目标,本文探索采用单位产值 CO2排放量和单位工业增加值 CO2排放量作为补充指标,用以比较研究不同现代煤化工过程的低碳水平和碳排放强度。研究结果表明,用不同的指标来衡量比较现代煤化工过程的 CO2排放量,得到的结果不同。煤制甲醇、煤制二甲醚的吨产品CO2排放量虽然较低,分别为3.85t和5.0t,但单位热值CO2排放量较高,分别为0.159t/GJ和0.160t/GJ。在80美元/bbl和40美元/bbl的原油价格体系下,煤制天然气和煤制甲醇的单位产值和单位工业增加值CO2排放量均高于其他现代煤化工产品。%Based on the demands of the development of low-carbon economy,the CO2 emissions in several typical processes of modern coal chemical industry were analyzed in this paper,and it was put forward that scientific comparison of CO2 emissions in the processes of modern coal chemical industry should be studied. For coal-based chemicals,such as coal to olefin,coal to ethylene glycol,etc.,using CO2 emissions per unit of heat value as the evaluation index was not suitable. Based on the different characteristics of coal-based fuel products and chemicals,combining with the control target of carbon emission intensity in our country,using CO2 emissions per unit of output value and CO2 emissions per unit of industrial added value as supplementary indexes for comparative study on the level of low carbon and carbon emission intensity of different processes of modern coal chemical industry were explored. The studies showed that the results were different when using different indicators to measure the CO2 emissions of different processes of modern coal chemical industry. For coal to methanol and coal to dimethyl ether,the CO2 emissions per ton product were lower as 3.85 t and 5.0 t,respectively, but the CO2 emissions per unit of heat value were higher as 0.159 t/GJ and 0.160 t/GJ,respectively. Under the crude oil price system of 80$/bbl and 40$/bbl,the CO2 emissions per unit of output valueand industrial added value of coal-based synthetic natural gas and coal to methanol were both higher than other modern coal chemical products.

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