专业英语 reactor lesson 29 reactors 课件.pptx

Part 5 Typical Equipments in PlantsLesson 29 Reactor;New Words And Expressions;slurry 泥浆, 浆 miscible 易混合的 plugflow 柱塞流 homogeneous 同类的, 相似的, 均一的, 均匀的 heterogeneous 不同种类的 dissolve . 溶解 configuration 构造, 结构, 配置, 外形 bear in mind 记住 consist of 由...组成 fluid flow 流体流动 heat transfer 传热 mass transfer 传质 play a …part in… 起...作用 take place 发生 ;In considering continuous reaction equipment, it is often convenient to bear in mind certain simple, or idealized, types of reactor. We shall discuss the general characteristics of these ‘model’ reactors. The first type we shall describe is the tubular reactor. ;The tubular reactor The tubular reactor is so named because in many of its instances it takes the form of a tube. However, what is meant in general by a tubular reactor is any continuously operating reactor in which there is a steady movement of one or all of the reagents in a chosen spatial direction(the reagents entering at one end of the system and leaving at the other). ;The continuous stirred tank reactor (C.S.T.R.) ;This type of reactor consists of a well-stirred tank into which there is a continuous flow of reacting material, and from which the (partially) reacted material passes continuously. It is because such vessels are squat in shape(e.g. cylindrical vessels as wide as they are deep) that good stirring of their contents is essential; otherwise there could occur a bulk streaming of the fluid between inlet and outlet and much of the vessels would be essentially dead space. ;The fluidized-bed reactor This can be used for reactions involving a solid and a fluid (usually a gas). The earliest and perhaps best-known example is the “catcracker”, in which the solid is a catalyst for the cracking of hydrocarbon vapors. There are many other diverse types of reactor which have been found useful in particular cases. Brief mention can be made of four. ;Bubble-phase reactors: Here a reagent gas is bubbled through a liquid with which it can react, because th