A non-premixed reactive volatilization reactor for catalytic partial oxidation of low volatility fuels at a short contact time,Reaction Chemistry & Engineering

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A non-premixed reactive volatilization reactor for catalytic partial oxidation of low volatility fuels at a short contact time
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-2-15 , DOI: 10.1039/d0re00460j
Ying Lin _{1,

2,

3,

4} , Xuesong Li _{1,

2,

3,

4} , Martyn V. Twigg _{5,

6,

7} , William F. Northrop _{1,

2,

3,

4}

Affiliation

This work presents a novel non-premixed opposed-flow reactive volatilization reactor that simultaneously vaporizes and partially oxidizes low volatility liquid hydrocarbons at a short contact time (<12 ms). In the reactor, a catalyst-coated metal mesh is placed interstitially between an air duct and a liquid pool. Low-volatility fuels are evaporated by radiative and convective heating and combine at local stoichiometry determined by the axial location of the mesh. Experiments were conducted with n-dodecane at different local molar carbon-to-oxygen ratios (C/O) and inlet airflow. Platinum and rhodium coated mesh substrates were the active materials for performing partial oxidation. A 1D opposed-flow similarity model based on the canonical opposed-flow combustion solution was created to simulate the axial temperature and species concentration along the reactor centerline. Results show that the reactor vaporized and converted n-dodecane to reformed products at a global molar carbon-to-oxygen ratio (C/O)_g of up to 3.46. However, the local mixture depended on mesh axial position, with (C/O)_mesh ranging from 0.2 to 3.94 for platinum and 0.31 to 4.97 for rhodium. It was found that the local stoichiometry at the mesh surface plays a more important role than the global one since no gas-phase reactions occurred outside the mesh region. Overall, our work demonstrates that non-premixed catalytic reactive volatilization is a promising technique to investigate fundamental concepts in hydrocarbon reforming and can offer insights into designing practical short-contact time reactors that can have high conversion and selectivity but low surface carbon deposition tendency at high C/O.

中文翻译：

非预混合反应挥发反应器，用于在短接触时间内催化低挥发性燃料的部分氧化

这项工作提出了一种新颖的非预混合的对流反应挥发反应器，该反应器在短的接触时间（<12毫秒）内同时蒸发并部分氧化了低挥发性液态烃。在反应器中，涂覆有催化剂的金属网被置于空气导管和液体池之间的空隙中。低挥发性燃料通过辐射和对流加热而蒸发，并以由筛网的轴向位置确定的局部化学计量结合。实验是用n-十二烷在不同的局部碳氧比（C / O）和进气流量下。涂有铂和铑的网状基材是进行部分氧化的活性材料。建立了基于经典逆流燃烧解的一维逆流相似性模型，以模拟沿反应堆中心线的轴向温度和物质浓度。结果表明，反应器以高达3.46的总摩尔碳氧比（C / O）_g蒸发并转化了正十二烷为重整产物。但是，局部混合物取决于网格轴向位置，其中（C / O）_网格铂的范围为0.2至3.94，铑的范围为0.31至4.97。已经发现，网孔表面的局部化学计量比整体的化学计量起着更重要的作用，因为在网孔区域之外没有发生气相反应。总的来说，我们的工作表明，非预混合催化反应挥发是研究烃重整基本概念的有前途的技术，可以为设计实用的短接触时间反应器提供见解，该反应器具有高转化率和选择性，但在高温下表面碳沉积趋势低。 C / O。

更新日期：2021-03-02

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