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Evaluation of the Effect of CaO on Hydrogen Production by Sorption-Enhanced Steam Methane Reforming
Yun Luo1, Juan Chen1, Tao Wang1
1National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan, Shandong 250061, China.
Abstract:
The effect of heat released during CaO adsorption on sorption-enhanced steam methane reforming for hydrogen production is insufficiently understood. On this basis, Aspen Plus is used to study the effect of steam methane reforming on hydrogen production without/with CaO. At 700 °C and an O2 inflow of 7 mol/h, the molar flow and molar percentages of H2 are 20.62 and 67.35%. After adding CaO, at 700 °C with 4.5 mol/h of CaO, the heat release of CaO adsorption is 1.32 MJ/h, and the O2 inflow reduces to 4.3 mol/h. The molar flow and molar percentage of H2 are 22.80 mol/h and 85.94%. When 1.2 mol/h CH4 is combusted for CaCO3 decomposition in the calciner, regenerated CaO is transferred to the reforming reactor for calcium cycling, which consumes 2.4 mol/h of O2. For the entire cycle, 6.7 mol/h of O2.
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