甲烷化固定床反应器化学反应模拟及结构优化

发布时间：2019-04-15 12:06

【摘要】：针对我国“富煤、贫油、少气”的资源禀赋,通过煤炭资源清洁转化的工艺,将资源优势转化成经济优势。在煤制天然气甲烷化工艺过程中,甲烷化反应器作为该过程的核心设备,因其强放热且热量难以移出的特点成为研究的重点对象。对于甲烷化反应器内部特征参数场分布的研究,能够间接的反映出反应器内部化学反应情况,对于实现甲烷化反应器结构优化和化学反应强化有重要意义。实测方法无法直接测得反应器内部连续的特征参数分布,采用计算机模拟的方法能够比较准确、全面地反映出整个反应器内部特征参数连续性分布情况。冷态下,通过数值模拟的方法,获得了床层在径向和轴向上的速度、空隙率、压力分布规律,拟合了床层空隙率径向、轴向分布函数,将实验结果与模拟结果进行对比,验证了模拟结果的准确性。探究了壁效应对催化剂床层堆积结构及其特征参数分布的影响,确定了壁效应的影响范围。研究了重力、管径比以及催化剂颗粒的粒径分布函数对于床层内部堆积结构及流场分布的影响。热态下,通过对随机堆积催化床内部的甲烷化反应模拟,获得了床层内部温度场、压力场、组分浓度等特征参数场分布。探究了催化剂颗粒粒径分布、管径比、物料进口温度、速度对化学反应的影响,并对催化剂床层长径比和段数对化学反应的影响进行探究。获得的相关结论为实际生产提供建议。
[Abstract]:In view of the resource endowment of "rich in coal, poor in oil and less in gas", the advantages of resources are transformed into economic advantages through the process of clean transformation of coal resources. In the process of methanation from coal to natural gas, methanation reactor, as the core equipment of the process, has become the focus of the research because of its strong exothermic and difficult to remove the heat. The research on the distribution of characteristic parameter field in the methanation reactor can indirectly reflect the chemical reaction inside the reactor, which is of great significance for the optimization of the structure of the methanation reactor and the enhancement of the chemical reaction. The continuous distribution of the characteristic parameters in the reactor can not be directly measured by the measured method. The method of computer simulation can reflect the continuous distribution of the characteristic parameters in the reactor in an all-round way. In the cold state, the radial and axial velocity, voidage and pressure distribution of the bed are obtained by numerical simulation, and the radial and axial distribution functions of the bed voids are fitted. The experimental results are compared with the simulated results, and the experimental results are compared with the simulated results, and the experimental results are compared with those of the simulation, and the experimental results are compared with the simulated results. The accuracy of the simulation results is verified. The effect of wall effect on the stacking structure and characteristic parameter distribution of catalyst bed was investigated, and the influence range of wall effect was determined. The effects of gravity, pipe diameter ratio and the particle size distribution function of catalyst particles on the stacking structure and flow field distribution in the bed were studied. In the thermal state, the distribution of temperature field, pressure field and component concentration in the bed were obtained by simulating the methanation reaction in the random stacking catalytic bed. The effects of particle size distribution, tube diameter ratio, inlet temperature and velocity on the chemical reaction were investigated, and the effects of catalyst bed length / diameter ratio and section number on the chemical reaction were also discussed. The conclusions obtained provide suggestions for practical production.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE665.3

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