|摘要: ||本論文使用計算流體力學(Computational Fluid Dynamics，CFD) 軟體FLUENT配合一系列之使用者自定函數(User Defined Function, UDF)完成了自二氧化碳合成甲醇之填充床式觸媒反應器(Packed Bed Catalytic Reactor，PBR)與觸媒薄膜反應器(Catalytic Membrane Reactor，CMR)之三維模式模擬，模式納入了填充床球型觸媒顆粒反應器中(1)巨相之流力、熱傳與質傳；(2)觸媒顆粒內之流力、熱傳、質傳與化學反應；(3)巨相與觸媒顆粒間之流力、熱傳與質傳；及(4)薄膜兩側巨相間之流力、熱傳與質傳。流體速度限制於層流範圍。|
This thesis uses Computational Fluid Dynamics, combining with a set of User Defined Functions (UDF) to accomplish the simulation studies for the Packed Bed Catalytic Reactor (PBR) and the Catalytic Membrane Reactor (CMR) for methanol synthesis from carbon dioxide and hydrogen.
The model encompasses all important mechanisms for PBR and CMR, including (1) the hydraulic, heat and mass transfers of bulk gas; (2) the hydraulic, heat and mass transfers and chemical reaction of catalyst; (3) the hydraulic, heat and mass transfers between bulk gas and catalyst; (4) the hydraulic, heat and mass transfers between bulk gases and membrane. The fluid is in the laminar flow region.
The simulation facilitates the discussions on the profiles inside the reactor, including pressure, velocity, temperature and composition. The effects of catalyst particle pore size, diameter, operation pressure, feed flowrate, with or without membrane and membrane thickness are studied. The friction factor of the bed and the heat and mass transfer coefficients between catalyst particle and bulk gas are compared with the correlations reported in the literature. The friction factors are close to the correlations predictions, however, the heat and mass transfer coefficients are not and the data are very scattering.