关键词: 二氧化碳, 现代煤化工, 单位产值CO₂排放量, 单位工业增加值CO₂排放量

Abstract: 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 value and industrial added value of coal-based synthetic natural gas and coal to methanol were both higher than other modern coal chemical products.

Key words: carbon dioxide, modern coal chemical industry, CO₂ emissions per unit of output value, CO₂ emissions per unit of industrial added value