液体分布器 Liquid Distributor

加氢反应器所使用的液体分布器,按其作用原理大致可分为溢流式和抽吸喷射式两类;液体分配盘应不漏液,安装后须进行测漏试验,即在分配盘上充水至100mm高,在5分钟内其液位下降高度,以不大于5mm为合格;分配盘安装的水平度要求,对于喷射式的分配器,包括制造公差和在载荷作用下的绕度在内,其分配盘的水平度应控制为±5mm~±6mm;对于溢流式的分配器,其分配盘安装的水平度要求更严格一些。 在催化剂床层上面,采用分配盘是为了均布反应介质,改善其流动状况,实现与催化剂的良好接触,进而达到径向和轴向的均匀分布。 Performance of the catalyst in an axial flow reactor is very much dependent upon the hydraulics of the flow distribution system。Whether in upflow or in downflow operation, uniformity of flow distribution is key to even transit time, to catalyst use and to catalyst deactivation。 In optimum conditions, plug flow is managed in order to obtain, high purity products。Distribution is critical under 2-phase flow: when liquid and gas are mixed, the pattern of liquid spreading in the gas or gas diffusion into the liquid is essential to the process chemistry。The liquid distributor system has to perform equally against versatility of incoming flow。 Pressure drop must be controlled for its contribution as a flow reducing factor。Distribution is more critical for high pressure reactors where height saving significantly reduces the equipment costs or for revamp where increased capacity is required for increased throughput。Flow is distributed via several distribution nozzles attached to the distributor tray。 Each distributor nozzle is a flow restriction using Venturi effect to perform its duty。 Nozzle spacing, pattern and type are particular to each application。

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