工厂化水产养殖溶解氧自动监控系统的研究

Automatic monitoring and control system of dissolved oxygen levels in recirculating aquaculture

为以曝气增氧方式的养殖系统(养殖平均体重为450 g的虹鳟Oncorhynchus mykiss,养殖密度为27kg/m3)设计了在线自动监控系统,即对水体溶解氧进行在线监测,对增氧设备进行自动控制。该监控系统是以覆膜溶解氧电极作为检测元件,用组态王软件设计在上位机中运行的监控系统完成在线检测,以PLC为下位机直接控制增氧气泵实现溶解氧控制功能。结果表明:该溶解氧在线自动监控系统能直观地在计算机屏幕上显示养殖现场溶解氧的变化情况,并可以储存、打印、记录溶解氧的变化数值,为掌握溶解氧的变化规律,分析溶解氧产生变化的原因提供基础数据。对增氧设备进行控制,可确保水体中的溶解氧维持在适合鱼类生长的最佳范围内,减少了设备的运行时间,降低了生产过程的能源消耗,取得了较好的效果。

Dissolved oxygen （DO） is one of the most important parameter of industrial recirculating aquaculture. In our experiment system, an oxygen aerator was functioned by an air pump which injected air into the culture water through a series of air stones. The optimal DO levels were maintained in the recirculating aquaculture water. An automatic monitor and control system was designed to control and to monitor DO condition. In this system, programmable logic controller（PLC） was used to collect data and control the air pump. Meanwhile, a monitoring program was designed with a software called KingView to monitor the change in water DO levels. This automatic monitoring and control system can display the data of DO with curve and table on computer, recording and printing the data. Base on these data, this system controls aeration pump to run or stop so that the time of running aeration pump and energy consumption are limited.