Thermodynamic analysis and experimental verification of hydrogen production from dimethyl ether partial oxidation reforming
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摘要: 用元素势能法对二甲醚(DME)部分氧化重整制氢进行了热力学分析与计算,在定压绝热条件下计算了产物中各组分的体积分数随空醚比(0.5~4)和压强(0.1~0.5MPa)的变化关系.结果表明:H2的体积分数随压强的增大而减小;在标准大气压和空醚比为3的条件下,由二甲醚部分氧化反应得到的氢气体积分数最大,约为35%;H2的体积分数随空醚比的增大先增后减,CO的体积分数变化不明显,CO2和CH4的体积分数随空醚比的增大而减小.最后,在自制实验台上进行二甲醚等离子体重整制氢的实验,将该实验结果与热力学分析结果进行了对比分析,结果证明用元素势能法分析得到的H2,CO,CH4和CO2的体积分数随空醚比的变化趋势与实验结果较为一致.Abstract: Thermodynamic analysis was carried out for theoretical reaction of hydrogen produced from dimethyl ether(DME) partial oxidation reforming by using the element-potential method. The gas concentrations in the product gas were calculated under the constant-pressure and adiabatic condition as a function of air-to-DME ratio(0.5~4) and pressure(0.1~0.5MPa). The result proves that H2 concentration decreases with increasing of pressure. H2 concentration produces from DME partial oxidation reaction is the largest under atmosphere when air-to-DME ratio is about 3. The maximum is about 35%. By increasing air-to-DME ratio, H2 concentration increases firstly and then decreases, and CO concentration doesn-t changes obviously, and the concentration of CO2 and CH4 decreased respectively. Adiabatic temperature increases with increasing of air-to-DME ratio. At last, the experiment of hydrogen-rich gas produces from plasma reforming of DME is carried out on self-made equipments to verify the analysis, it proves that the concentration of H2,CO,CO2 and CH4 as a function of air-to-DME ratio analyzed by the element-potential method is almost in agreement with the experimental result.
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Key words:
- reforming /
- hydrogen production /
- thermodynamic analysis /
- element-potential method /
- dimethyl ether
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