双环径向反应器流场特性研究
发布时间：2018-07-13 20:18
【摘要】：在以铝或沸石为载体的铂催化剂上,直链烷烃脱氢生成直链单烯烃,作为烷基苯生产的工业原料。脱氢反应通常在径向反应器中进行。本论文以金陵石化公司烷基苯厂的烷烃脱氢装置作为研究对象,该脱氢装置是在传统径向反应器的基础上进行技术改造,成为了有两个催化剂床层的气固双环径向反应器。与传统的径向反应器相比,双环径向反应器具有床层压降更低、流通面积更大、流程更短的优点,所以双环径向反应器对于流体处理量大的反应有更高的工业应用价值。本文根据主流道变质量流与颗粒床层气固流体力学理论,利用变质量流方程、Ergun方程和连续性方程,建立了完整的双环径向反应器流体力学数学模型,开发了针对模拟计算双环径向反应器内外侧催化剂床层气相二维流场的一种数学方法及相应的计算程序,由此可以描述内外侧催化剂床层中流体的二维流场和主流道的流体力学行为。但是和传统径向反应器相比,双环径向反应器由三个流道(内环隙、外环隙、中心管)和两个床层(内外侧催化剂床层)组成,特别的是,在内环隙中,反应物流分流分成两部分分别流入内外侧催化剂床层,本文定义了内环隙流体流量分配函数T,利用Powell算法对分配函数T进行优化。利用中心管和外环隙流道出口压力一致的己知条件进行工业验证,证明模型的可靠性。本文利用建立的数学模型模拟计算了不同结构尺寸时双环径向反应器的流场分布,主要是通过内外侧催化剂床层的质量空速和内外环的轴向分流均匀度的变化,寻找合适的反应器尺寸来平衡双环径向反应器的内外环。模拟结果显示,改变内侧催化剂床层内径,除了中心管的外径改变外,其它反应器的尺寸保持不变,内侧催化剂床层最佳的内径范围是0.3175～0.3195 m;改变外侧催化剂床层外径,除了外环隙的内径改变外,其它反应器的尺寸保持不变,外侧催化剂床层最佳的外径范围是0.907～0.910 m。此时双环径向反应器的内外环基本处于平衡的状态。该模型不仅可以用来分析现有工业脱氢反应器结构设计的合理性,还可以为以后双环径向反应器的设计提供定量的参考依据。
[Abstract]:On platinum catalyst supported on aluminum or zeolite, straight chain alkanes were dehydrogenated to form straight chain monoolefins, which were used as industrial raw materials for the production of alkyl benzene. Dehydrogenation usually takes place in a radial reactor. In this paper, the alkane dehydrogenation unit of Jinling Petrochemical Company is taken as the research object. The dehydrogenation unit is based on the traditional radial reactor and has been transformed into a gas-solid double-ring radial reactor with two catalyst beds. Compared with the traditional radial reactor, the dual-loop radial reactor has the advantages of lower pressure drop, larger circulation area and shorter flow rate. Therefore, the dual-loop radial reactor has higher industrial application value for the reaction with large fluid handling capacity. Based on the theory of gas-solid fluid mechanics of variable mass flow and particle bed in mainstream channel, a complete mathematical model of hydrodynamics for dual loop radial reactor is established by using the Ergun equation and continuity equation of variable mass flow equation. A mathematical method and a corresponding program for simulating the gas phase two-dimensional flow field of the catalyst bed inside and outside the double ring radial reactor are developed. The two dimensional flow field and the hydrodynamic behavior of the main channel in the inner and outer side catalyst bed can be described. But compared with the conventional radial reactor, the double-ring radial reactor consists of three channels (inner ring, outer ring, central tube) and two beds (inside and outside the catalyst bed), especially in the inner ring. The reaction material flow is divided into two parts, which flow into the inner and outer side of the catalyst bed respectively. In this paper, the internal annular fluid flow distribution function T is defined, and the distribution function T is optimized by Powell algorithm. The model is proved to be reliable by using the known conditions of uniform outlet pressure between the central tube and the outer annular channel. In this paper, the flow field distribution of the dual ring radial reactor with different structure sizes is simulated by using the established mathematical model, mainly through the variation of the mass space velocity of the inner and outer side catalyst bed and the axial distributary uniformity of the inner and outer ring. Find the appropriate reactor size to balance the inner and outer rings of the dual loop radial reactor. The simulation results show that the inner diameter of the inner catalyst bed remains unchanged except for the outer diameter of the central tube, and the optimum inner diameter range of the inner catalyst bed is 0.3175 ~ 0.3195 m, and the outer diameter of the outer catalyst bed is changed. Except the change of inner diameter of outer ring gap, the size of other reactors remained unchanged, and the optimum outer diameter range of outside catalyst bed was 0.907 ~ 0.910 m. At this time, the inner and outer rings of the dual ring radial reactor are basically in equilibrium state. The model can not only be used to analyze the rationality of the structural design of the existing industrial dehydrogenation reactor, but also provide a quantitative reference for the design of the dual-ring radial reactor.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ052.5
本文编号：2120619
[Abstract]:On platinum catalyst supported on aluminum or zeolite, straight chain alkanes were dehydrogenated to form straight chain monoolefins, which were used as industrial raw materials for the production of alkyl benzene. Dehydrogenation usually takes place in a radial reactor. In this paper, the alkane dehydrogenation unit of Jinling Petrochemical Company is taken as the research object. The dehydrogenation unit is based on the traditional radial reactor and has been transformed into a gas-solid double-ring radial reactor with two catalyst beds. Compared with the traditional radial reactor, the dual-loop radial reactor has the advantages of lower pressure drop, larger circulation area and shorter flow rate. Therefore, the dual-loop radial reactor has higher industrial application value for the reaction with large fluid handling capacity. Based on the theory of gas-solid fluid mechanics of variable mass flow and particle bed in mainstream channel, a complete mathematical model of hydrodynamics for dual loop radial reactor is established by using the Ergun equation and continuity equation of variable mass flow equation. A mathematical method and a corresponding program for simulating the gas phase two-dimensional flow field of the catalyst bed inside and outside the double ring radial reactor are developed. The two dimensional flow field and the hydrodynamic behavior of the main channel in the inner and outer side catalyst bed can be described. But compared with the conventional radial reactor, the double-ring radial reactor consists of three channels (inner ring, outer ring, central tube) and two beds (inside and outside the catalyst bed), especially in the inner ring. The reaction material flow is divided into two parts, which flow into the inner and outer side of the catalyst bed respectively. In this paper, the internal annular fluid flow distribution function T is defined, and the distribution function T is optimized by Powell algorithm. The model is proved to be reliable by using the known conditions of uniform outlet pressure between the central tube and the outer annular channel. In this paper, the flow field distribution of the dual ring radial reactor with different structure sizes is simulated by using the established mathematical model, mainly through the variation of the mass space velocity of the inner and outer side catalyst bed and the axial distributary uniformity of the inner and outer ring. Find the appropriate reactor size to balance the inner and outer rings of the dual loop radial reactor. The simulation results show that the inner diameter of the inner catalyst bed remains unchanged except for the outer diameter of the central tube, and the optimum inner diameter range of the inner catalyst bed is 0.3175 ~ 0.3195 m, and the outer diameter of the outer catalyst bed is changed. Except the change of inner diameter of outer ring gap, the size of other reactors remained unchanged, and the optimum outer diameter range of outside catalyst bed was 0.907 ~ 0.910 m. At this time, the inner and outer rings of the dual ring radial reactor are basically in equilibrium state. The model can not only be used to analyze the rationality of the structural design of the existing industrial dehydrogenation reactor, but also provide a quantitative reference for the design of the dual-ring radial reactor.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ052.5
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