To achieve safe storage and transportation of hydrogen energy,converting hydrogen gas into liquid methanol has become an important method for hydrogen storage.Hydrogen and carbon monoxide(CO)are used to produce methanol via the Fischer-Tropsch synthesis,which is widely applied due to its excellent performance.Traditional methods of producing hydrogen and CO mainly involve methane steam reforming and dry reforming of methane.However,these methods require high temperatures(≥850 ℃)and have high energy consumption,often relying on the combustion of methane to provide heat for the reaction.This paper proposes a solar-driven chemical looping reforming system for hydrogen production and methanol synthesis,using nickel oxide as the oxygen carrier.The reaction temperature can be reduced to 600 ℃,and the system is powered by solar thermal energy,avoiding methane combustion,reducing energy consumption,and lowering environmental impact.Additionally,following the principle of"temperature matching and cascading utilization",the high-temperature flue gas and gas steam generated by methane chemical looping reforming are coupled in a combined cycle for power generation.Energy,efficiency,and sensitivity analysis results show that when the fuel reactor and air reactor temperatures are 600 ℃ and 1 200 ℃,respectively,the molar ratio of nickel oxide to methane is 0.8,and the molar ratio of water to methane is 1.9,the system achieves an energy utilization efficiency of 62.82％,an efficiency of 64.75％,and a methanol yield of 69.73％.Under these conditions,the methane conversion rate is 80.58％,which is 250 ℃ lower than traditional methane reforming methods,while significantly improving the methane conversion rate.
chemical looping reformingmethanol productionsolar thermal energy storagesensitivity analysisenergy and exergy analysis
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