Analysis on production process of coal to oil with life cycle assessment

Based on the spot investigations and annual report statistics of a coal chemical factory,the total energy consumption and pollutants discharge of the entire process were calculated and analyzed by LCA methods,including the coal mining process,transportation process and coal to oil process.In order to promote the low carbon and green development of coal chemical industry on the assumption of ensuring energy security and clean using of energy,the environmental impacts were also identified,and the major pollution processes and pollutants were determined.The results show that production of 1 ton coal-based oil,the total discharge of gaseous pollutants is 16. 56 t,among which CO_2 is about 98.03% of the total emissions.It is mainly from the adjustment of C/H atomic ratio in the processing step and combustion discharge in the energy power generation step,being 53.9% and 25.87% respectively.The total amount of greenhouse gas emissions calculated by CO_2 is about 16.23 t,acidification gas is 33.847 kg SO_2,eutrophic composition is 30.483 kg PO_4,and photochemical smog generated is 2.651 3 kg C_2H_4,as well as dust is 0.834 kg.The total discharged wastewater is 8.204 4 t/t oil,and 68.74% of which is from the production process.