Thermodynamic analysis of methane dry reforming for H2/CO syngas production
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摘要: 基于吉布斯自由能最小化原理，采用HSC Chemistry软件对甲烷干重整反应过程进行热力学分析，系统探讨反应温度、压力、进料比(物质的量比n(CH4)/n(CO2))、O2进量和H2O进量等关键参数对CO和H2平衡浓度、n(H2)/n(CO)及积碳量的影响。研究表明，当温度处于
1137 K，压力为101.325 kPa，n(CH4)/n(CO2)为1.20，n(O2)/n(CH4)为0.15和n(H2O)/n(CH4)为0.07时，n(H2)/n(CO)保持在0.90左右，接近理论值1。甲烷干重整可以同时实现温室气体的减排及高值化利用，制备的合成气是燃料和重要的化工原料气，是实现“双碳”目标的前景技术之一。Abstract: The thermodynamic analysis of the methane dry reforming process was conducted based on Gibbs free energy minimization principle using HSC Chemistry software. The effects of key parameters including reaction temperature, pressure, feed ratio (n(CH4)/n(CO2) mole ratio), O2 and H2O feed rates on equilibrium concentration of CO and H2, n(H2)/n(CO) mole ratio and carbon deposition were systematically investigated. It is shows that under conditions of1137 K reaction temperature, 101.325 kPa pressure, n(CH4)/n(CO2) ratio of 1.20, n(O2)/n(CH4) ratio of 0.15, and n(H2O)/n(CH4) ratio of 0.07, the n(H2)/n(CO) ratio is maintained at approximately 0.90, closely approaching the theoretical value of 1. The methane dry reforming enables both greenhouse gas reduction and high-value utilization, with the produced syngas serving as fuel and important chemical feed gas, making it a promising technology for achieving dual carbon goals.-
Key words:
- methane /
- dry reforming /
- H2/CO syngas. /
- thermodynamics /
- equilibrium
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图 2 反应温度对CO和H2平衡浓度的影响
Figure 2. Effect of reaction temperature on equilibrium concentrations of CO and H2
图 3 压力对CO和H2平衡浓度的影响
Figure 3. Effect of pressure on equilibrium concentrations of CO and H2
图 4 n(CH4)/n(CO2)对CO和H2平衡浓度的影响
Figure 4. Effect of mole ratio of n(CH4)/n(CO2) on equilibrium concentrations of CO and H2
图 5 n(O2)/n(CH4)对CO和H2平衡浓度的影响
Figure 5. Effect of mole ratio of O2/CH4 on equilibrium concentrations of CO and H2
图 6 n(H2O)/n(CH4)对CO和H2平衡浓度的影响
Figure 6. Effect of mole ratio of H2O/CH4 on equilibrium concentrations of CO and H2
图 7 n(H2O)/n(CH4)对积碳量的影响
Figure 7. Effect of mole ratio of H2O/CH4 on carbon deposition
表 1 CH4和CO2转化过程中的相关反应
Table 1. Related reactions during CH4 and CO2 conversion process
序号 1 2 3 4 5 6 7 8 反应物 CH4 + CO2 CO2 + H2 CO2 + H2 CH4 + CO2 CO CH4 CO + H2 CH4 + O2 生成物 CO + H2 CO + H2O CH4 + H2O CO + H2O C + CO2 C + 2H2 C + H2O CO2 + H2O 
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