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Key technical challenges relating to the Fischer-Tropsch(F-T)synthesis applied in the commer- cialization of coal/gas-to-liquids(CTL/GTL)technolo- gies have been reviewed.Based on the experiences ac- cumulated from pilot plant,semi-work test and lab re- searches,the influences of the H_2/CO ratio and the CO_2 in the feed gas on the F-T process as well as on CTL/GTL complex in terms of product yields,energy efficiency and carbon utilization efficiency have been studied.Being contrary to the current design schemes for F-T process using the coat derived syngas and the iron-based cata- lyst,it is suggested to feed the F-T synthesis unit with a syngas having a H_2/CO ratio of 0.5 and then adjusting to 1.4 via the recycling process.As a result,the carbon efficiency of the whole plant could be reached to as high as 50%.For the issue of CO_2 addition to the feed gas, it is proved that only a diluting role is played under the current commercial slurry phase F-T process.
Key technical challenges relating to the Fischer-Tropsch (FT) synthesis applied in the commercialization of coal / gas-to-liquids (CTL / GTL) technolo- gies have been reviewed by the experiences ac- cumulated from pilot plant, semi-work test and lab re- searches, the influences of the H_2 / CO ratio and the CO_2 in the feed gas on the FT process as well as on CTL / GTL complex in terms of product yields, energy efficiency and carbon utilization efficiency have was studied. being contrary to the current design schemes for FT process using the coat derived syngas and the iron-based cata- lyst, it is suggested to feed the FT synthesis unit with a syngas having a H2 / CO ratio of 0.5 and then adjusting to 1.4 via the recycling process. As a result, the carbon efficiency of the whole plant could be reached as high as 50%. For the issue of CO_2 addition to the feed gas, it is verified that only a diluting role is played under the current commercial slurry phase FT process.