人工海水制备系统的浓盐水制备过程设计

Brine preparation process design of artificial seawater preparation system

人工制备海水要求在有限的时间内自动制备具有精确盐度与电导率的人工海水,其中的一个重要环节是浓盐水制备工艺过程.首先,设计了浓盐水制备工艺流程、制备装置和自动控制系统.工艺流程是在浓盐水罐中补充淡水或低浓度海水,加入海盐,循环搅拌和定量排出的过程.制备装置是由盐水罐、截止阀、电磁阀、回止阀、过滤器、搅拌器和管路系统等组成的,采用可编程控制器实现自动工艺流程控制.其次,进行了软件设计,将制备工艺过程分成4种工况分别设计:海盐与目标水池水量不足、海盐与目标水池水量过量、海盐不足而目标水池水位达到、海盐溶解完毕与目标水池水位未达到.最后,软件系统编程实现了工艺流程动作顺序的逻辑控制,完成了复杂工艺流程的自动控制.

Brine preparation process was an important part of artificial seawater preparation device,which was used to produce an amount of artificial seawater with accurate salinity and conductivity in a limited time.Firstly,the brine preparation process,preparation device and automatic control system were designed.The brine preparation process consisted of filling the brine tank with freshwater supplement or artificial seawater with lower salinity,adding a certain amount of sea salt into the tank with water,mixing up the water and salt in the tank to make brine and pumping out for dilution.The preparation device was composed of brine tank,shut-off valve,solenoid valve,check valve,filter,mixture machine and pipelines.The automatic control system made use of Programmable Logic Controller to control the device and preparation process.Then the control software was designed,which divided the preparation process into 4 kinds of working cases:insufficient sea salt and pool water,excessive sea salt and pool water,insufficient sea salt and sufficient pool water,completed sea salt dissolution and sufficient pool water.Finally,the software system was designed to realize the conditional logic control of action sequence and to complete the automatic operation of complex preparation process.