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多效蒸发海水淡化系统动态模拟的研究目的是建立一个完整的多效蒸发海水淡化系统动态模型,分析当系统输入参数变化时系统内其他参数的动态响应规律,并能根据动态模拟结果制定合理的控制方案。研究方法主要采用的是Aspen软件模拟。蒸发器是多效蒸发海水淡化系统的主要单元,在Aspen Plus软件中选用Heater、Flash、Pump和Split模块完成单效蒸发器模型的建立,在单效蒸发器模型的基础上建立了带有热量回收段的多效蒸发海水淡化流程。以六效蒸发海水淡化系统为例,采用与海水等盐度的NaCl溶液作为模拟介质进行模拟。稳态模拟的结果作为Aspen Dynamics软件进行动态模拟的初始参数。动态模拟过程中,分析了最高盐水温度、进料海水温度和进料流量波动时,多效蒸发系统中各参数的动态响应规律,以此为基础根据过程控制工程中制定控制方案的要求提出3种不同的控制方案。在Aspen Dynamics软件中对3种控制方案的控制效果进行比较,选择了恢复时间短,抵抗外界干扰的能力强的控制方案。动态模拟的研究结果对实际生产中的多效蒸发海水淡化系统的控制具有一定的指导意义。
The purpose of the research is to establish a complete dynamic model of multi-effect evaporative seawater desalination system and analyze the dynamic response rules of other parameters in the system when the input parameters of the system are changed. According to the dynamic simulation results, a reasonable Control plan. The main research method used is Aspen software simulation. Evaporator is the main unit of multi-effect evaporation desalination system. Heater, Flash, Pump and Split module are used in Aspen Plus software to build single-effect evaporator model. Based on single-effect evaporator model, Recycling of multi-effect evaporation of seawater desalination process. Taking a six-effect evaporation seawater desalination system as an example, a salinity NaCl solution was used as a simulation medium for seawater simulation. The results of the steady-state simulation serve as initial parameters for the dynamic simulation of the Aspen Dynamics software. In the process of dynamic simulation, the dynamic response law of each parameter in multi-effect evaporation system was analyzed when the maximum brine temperature, feed seawater temperature and feed flow fluctuated. Based on this, we proposed the control scheme according to the requirement of making control scheme in process control project Different kinds of control schemes. The control effects of the three control schemes are compared in Aspen Dynamics software, and the control scheme with short recovery time and strong resistance to outside interference is selected. The results of the dynamic simulation are of guiding significance for the control of the multi-effect evaporation desalination system in the actual production.