中低温太阳热能的甲醇重整制氢能量转换机理研究

ENERGY CONVERSION MECHANISM OF HYDROGEN PRODUCTION WITH METHANOL STEAM REFORMING BY MID-AND-LOW TEMPERATURE SOLAR THERMAL ENERGY

通过甲醇-水蒸汽化学反应,本文提出中低温太阳热能与甲醇重整反应结合的制氢新方法,探讨了中低温太阳热能与甲醇重整制氢过程的能量转换机理,分析了不同压力条件下的水碳比、反应温度对中低温太阳热能-甲醇重整制氢的影响规律。研究结果表明：集热180～240℃的低品位太阳热能（品位为0.34～0.42）将能更好地与甲醇重整反应所需的品位相匹配。在反应压力为1×1.01325×10^5 Pa,反应产物中H_2浓度可有望达到72%～75%,中低温太阳热能转化为化学能占燃料化学能的份额可达12%。该研究为低能耗制取清洁燃料氢提供了一条新途径。

In this paper we proposed a novel approach for the solar hydrogen production which integrated methanol steam reforming and mid-and-low temperature solar thermal energy, and investigated its mechanism of energy conversion based on the second-law thermodynamics. The influence of the operation pressures and temperatures of methanol fuel, as well as the influence of molar ratios of water to methanol, has been analyzed. Study indicates that low-grade solar thermal energy at temperatures around 180-240℃ （energy level is 0.34-0.42） can further match the need of the energy level of the methanol steam reforming. Under the operation pressure of 1 ×1.01325 ×10^5 Pa, the concentration of hydrogen of 72%0-75% in the syngas was obtained. Also, the ratio that mid-and-low temperature solar thermal energy converted into chemical energy accounts for the fuel energy reached 12% maximally. The promising results obtained in this study can provide a new approach for hydrogen production with low energy consumption.