ABB模块DP840 脉冲计数器售后服务

　　连续管式反应器或活塞流反应器模型 (PFR)

　　在管式反应器中，流体（气体和/或液体）以高速流过它。在这些高速下，产品无法向后扩散，并且很少或没有回混。这些条件称为活塞流。这减少了副反应并增加了所需产物的产率。

　　在恒定流速下，任何一点的条件随时间保持不变，并且反应时的变化通过沿管长度的位置来测量。

　　管道入口处的反应速率较快，因为反应物的浓度很高，并且由于反应物强度的降低，反应速率会随着反应物流过管道而降低。

　　? 固定床反应器

　　在气体流过固体催化剂的工业中经常使用多相催化剂。它通常被描述为催化剂的固定床，流经固体催化剂的气体形成产品。催化剂可以具有各种构型。

　　半间歇反应器

　　半间歇式反应器以连续和间歇输入和输出操作。气体与液体反应通常很困难，因为需要大量气体才能与等质量的液体反应。为了克服这个问题，可以将连续进料的气体鼓泡通过一批液体。通常，在半间歇操作中，将一种化学反应物加载到反应器中，然后缓慢加入第二种化学物质，这会导致相变。

　　管式炉

　　管式炉是一种电加热装置，用于进行无机化合物的合成和提纯，偶尔也可以进行有机合成。管式炉设计包括一个圆柱形腔室，周围环绕着安装在绝热基质中的加热线圈。温度可以通过热电偶控制。更复杂的管式炉有两个或多个加热位置，可用于传输实验。一些数字温度控制器提供 RS232 接口，并允许操作员对分段进行编程，以用于斜坡、浸泡烧结等用途。

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　　? Continuous tubular reactor or Plug flow reactor model (PFR)

　　In a tubular reactor, fluids (gases and/or liquids) flow through it at high velocities. At these high velocities, the products are unable to spread back and there is little or no back mixing. These conditions are referred to as plug flow. This reduces the side reactions and increases the yield of the desired product.

　　With a constant flow rate, the conditions at any one point remain constant with time and changes at the time of the reactions are measured by the position along the length of the tube.

　　The reaction rate is faster at the pipe inlet because the concentration of reactants is high and the reaction rate reduces as the reactants flow through the pipe due to the decrease in intensity of the reactant.

　　? Fixed bed reactors

　　A heterogeneous catalyst is used frequently in an industry where gases flow through a solid catalyst. It is often described as a fixed bed of catalyst, the gases flowing through solid catalyst form into products. The catalyst may have various configurations.

　　Semibatch reactor

　　A semibatch reactor is operated with both continuous and batch inputs and outputs. Reacting a gas with a liquid is usually difficult because a large volume of gas is required to react with an equal mass of liquid. To overcome this problem, a continuous feed of gas can be bubbled through a batch of a liquid. In general, in semibatch operation, one chemical reactant is loaded into the reactor and a second chemical is added slowly which results in a phase change.

　　Tubular furnace

　　A tube furnace is an electric heating device to conduct syntheses and purifications of inorganic compounds and occasionally organic synthesis. A tube furnace design consists of a cylindrical chamber surrounded by heating coils that are installed in a thermally insulating matrix. Temperature can be controlled from a thermocouple. More complex tube furnaces have two or more heating positions useful for transport experiments. Some digital temperature controllers provide an RS232 interface and allow the operator to program segments for uses like ramping, soaking sintering, and more.