In the context of peak carbon and carbon neutrality, the utilization of CO2 has attracted attention with the aim of reducing carbon emissions by converting CO2 into high-value chemicals or energy. Methanol (MeOH), which is both a hydrogen and a carbon carrier, is considered the most promising among the CO2-conversion products. This paper focus on routes for electrochemical conversion of CO2 to MeOH using green power and green hydrogen to achieve negative CO2 emissions. Three feasible technical routes for electrochemical conversion of CO2 to MeOH are proposed in this paper: Route 1, electrolysis of water to H2 and hydrogenation of CO2 to MeOH; Route 2, electrochemical reduction of CO2 to MeOH; and Route 3, co-electrolysis of CO2–H2O to syngas and synthesis of MeOH from syngas. Techno-economic assessments of the three routes are conducted using technical maturity surveys, system simulations and cost analyses to provide reference data for route selection for CO2 conversion to MeOH in China. Compared with the other routes, Route 1 is advantageous in terms of technical maturity and commercial application prospects. Although Route 1 is presently economically unviable, it is expected to achieve profitability and commercial application in the future with decreases in the cost of renewable power and continuous development of water-electrolysis technology.
As one of the significant part of IGFC (integrated gasification fuel cell) system, coal gasification technology has an important effect on system efficiency as well as technological process. To figure out what kind of gasifier technology could benefit IGFC system most, we select two representative gasifiers for comparison, which are E-Gas gasifier and Shell gasifier. In this study MW-level E-gas IGFC system and Shell IGFC system models are developed respectively, moreover, the energy analysis of two systems are carried out simultaneously. The results show that SOFC DC Power efficiency and system net plant efficiency of E-gas IGFC system are 52.82% and 50.89% , both higher than Shell IGFC system, which are 49.24% and 49.74%; under the same design conditions, gasifier with high content of CH 4 would be easier to obtain higher SOFC power efficiency as well as system net efficiency. The present work is helpful to provide gasifier selection suggestions for large-scale IGFC system.
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