燃煤烟道气中CO2耦合绿氢制烯烃工艺可行性和技术经济性分析OA

With the transition of the national energy structure and the advancement of"carbon peaking and carbon neutrality"strategy,CO2 hydrogenation to olefins process has become one of the key methods for carbon emission reduction and carbon utilization.Although experimental studies on catalysts for CO2 hydrogenation to olefins are relatively mature,their industrial application remains at a preliminary stage.Analyzing the process through simulation is one of the effective approaches to promoting their industrialization.Based on the catalysts for CO2 hydrogenation to olefins,a coupled process for converting CO2 from coal-fired flue gas and green H2 to olefins("coupling process"for short)has been established for olefin production capacity of 70×104 t/a.The process encompasses multiple units,including carbon capture,the reverse water-gas shift reaction,Fischer-Tropsch synthesis to olefins and the subsequent separation of light and heavy hydrocarbons.Simulation results indicate that the coupling process offers significant carbon reduction benefits,achieving the carbon efficiency of 99.71%and net CO2 emission of-1.83 t/t(the CO2 emission for production 1 t olefins is-1.83 t).Enhancing CO2 conversion rate can effectively reduce capital investment and improve energy efficiency,while the cost of H2 production plays a critical role in determining the economic viability of the coupled process.When the CO2 conversion rate increases from 47%to 79%,the energy efficiency of the coupling process reaches 40.92%and the total capital investment can be reduced by 38.79%.When the cost of H2 production decreases from 0.367 USD/m3(standard conditions)to 0.114 USD/m3,the production cost(refers to"olefins production cost")of the coupled process can be reduced by 51.58%,reaching as low as 1006.1 USD/t.At the similar H2 production cost(0.317 USD/m3),the production cost of the process is 2100.8 USD/t,which is lower than the reported value(3580 USD/t)in literature.