摘要
催化重整反应器是热化学储能装置的核心设备,但由于反应器内部情况较为复杂多变,导致实验仅能获得不同催化剂下反应的宏观结果。为了获得反应器内部温度、压力、速度等因素对反应的影响规律,分析反应器内部的反应过程,揭示Ni/Al 2O 3/MgO催化剂和焦炭催化剂的催化机理,基于计算流体动力学,利用数值仿真方法,构建了催化重整反应器的三维模型,采用三维轴对称稳态不可压缩湍流有限速率模型,研究了不同催化剂及结构参数对反应的影响。结果表明:两种催化剂都能有效促进反应的进行;相比较而言,Ni/Al 2O 3/MgO催化剂在满足 n (CO 2)/ n (CH 4)=1、 T = 850 ℃、 P =0.1 MPa的情况下,H 2/CO比值更接近于1,对CH 4-CO 2热化学储能系统甲烷干重整(DRM)反应有更好的促进作用;采用Fluent软件分析热化学催化重整反应的反应规律较为可靠。
Catalytic reforming reactor is the core device of thermo-chemical energy storage equipment.However,because of the complex and changeable conditions inside the reactor,only macroscopic results can be obtained in the experiments under different catalysts.In order to investigate the influences of temperature,pressure,and velocity on the reaction,we analyzed the reaction process in the reactor,and revealed the catalytic mechanism of Ni/Al 2O 3/MgO catalyst and coke catalyst.On the basis of computational fluid dynamics,we constructed a three-dimensional model of catalytic reforming reactor by a numerical simulation method.We studied the effects of different catalysts and structural parameters on the reaction by a three-dimensional axisymmetric steady-state incompressible turbulence finite-rate model.The simulation results show that the two catalysts can effectively promote the reaction.In comparison,Ni/Al 2O 3/MgO catalyst has a closer H 2/CO ratio to 1 under the conditions of n (CO 2)/ n (CH 4)=1, T =850 ℃,and P =0.1 MPa,which has a better promotion effect on dry reforming of methane for CH 4-CO 2 thermo-chemical energy storage system.Using Fluent software to analyze the thermo-chemical catalytic reforming reaction is reliable.
作者
乔丽洁
陈海峰
张悦
QIAO Lijie;CHEN Haifeng;ZHANG Yue(College of Mechanical and Electrical Engineering,Shaanxi University of Science and Technology,Xi′an 710021,China;Baotai Group Co.,Ltd.,Baoji 721000,China)
出处
《化学与生物工程》
CAS
2019年第6期34-39,共6页
Chemistry & Bioengineering
基金
陕西省教育厅专项科研计划项目(16JK1106)
关键词
热化学储能系统
反应机理
催化剂
数值仿真
甲烷干重整
thermo-chemical energy storage system
reaction mechanism
catalyst
numerical simulation
dry reforming of methane
作者简介
乔丽洁(1976-),女,河南孟县人,讲师,博士研究生,研究方向:化工设备与节能,E-mail:qiaolijie@sust.edu.cn.
