Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO2/Mo by methane reduction
Jiahui JIN1, Lei WANG2, Mingkai FU3(), Xin LI2, Yuanwei LU1()
1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China 2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China 3. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
受基于非化学计量氧化物的太阳能热化学循环（STC）中制氢前景和甲烷还原的操作降温效应的启发，研究了一种基于MoO2/Mo的高燃料选择性和引入CH4的太阳能热化学循环。通过HSC仿真，比较了等温和非等温操作条件下的能量提升和能量转换势。在还原步骤中，发现MoO2:CH4 = 2和1020 K < Tred <1600 K最有利于合成气选择性和甲烷转化。与没有CH4的STC循环相比，甲烷的引入会产生更高的氢气产量，尤其是在较低的温度范围和大气压下。在氧化步骤中，无论是在等温还是非等温操作中，适度过量的水都有利于能量转换，特别是在H2O:Mo=4时。在整个STC循环中，最大非等温和等温效率分别能达到0.417和0.391。另外，在Tred=1200 K和Toxi=400 K时，第二循环的预测效率也高达0.454，这表明MoO2能成为甲烷还原制备太阳能燃料的新的潜在候选物质。
Abstract：
Inspired by the promising hydrogen production in the solar thermochemical (STC) cycle based on non-stoichiometric oxides and the operation temperature decreasing effect of methane reduction, a high-fuel-selectivity and CH4-introduced solar thermochemical cycle based on MoO2/Mo is studied. By performing HSC simulations, the energy upgradation and energy conversion potential under isothermal and non-isothermal operating conditions are compared. In the reduction step, MoO2: CH4 = 2 and 1020 K<Tred<1600 K are found to be most favorable for syngas selectivity and methane conversion. Compared to the STC cycle without CH4, the introduction of methane yields a much higher hydrogen production, especially at the lower temperature range and atmospheric pressure. In the oxidation step, a moderately excessive water is beneficial for energy conversion whether in isothermal or non-isothermal operations, especially at H2O: Mo= 4. In the whole STC cycle, the maximum non-isothermal and isothermal efficiency can reach 0.417 and 0.391 respectively. In addition, the predicted efficiency of the second cycle is also as high as 0.454 at Tred = 1200 K and Toxi = 400 K, indicating that MoO2 could be a new and potential candidate for obtaining solar fuel by methane reduction.
通讯作者:
FU Mingkai,LU Yuanwei
E-mail: fumingkai@mail.iee.ac.cn;luyuanwei@bjut.edu.cn
Corresponding Author(s):
Mingkai FU,Yuanwei LU
引用本文:
JIN Jiahui, WANG Lei, FU Mingkai, LI Xin, LU Yuanwei. 基于MoO2/Mo甲烷还原的太阳能热化学循环制氢热力学评估[J]. Frontiers in Energy, 2020, 14(1): 71-80.
Jiahui JIN, Lei WANG, Mingkai FU, Xin LI, Yuanwei LU. Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO2/Mo by methane reduction. Front. Energy, 2020, 14(1): 71-80.
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