Study On The Integrated Monitoring System For Seawater Reverse Osmosis

The scarcity of fresh water resources seriously impacts and restricts national industrial production and people's living. However, SWRO (seawater reverse osmosis) opens up broad market prospects and has great actual demand as it can manufacture fresh water, which meets the needs of production and living, via ROM (reverse osmosis membrane). Currently, there are several disadvantages in SWRO, such as high water production cost, limit single plant capacity, system integration, and insufficient automation technology, etc, but the SWRO still has some noteworthy merits like high energy conservation and low cost in terms of the overall system's operation and management optimization. Therefore, this thesis investigates issues of developing an integrated monitoring system, with the combination of OPC technology, Optimization Model & Scheduling, Fault Analysis, etc, to further improve the system's total automation technology and achieve the aim of promoting the system's integration degree and reducing operating cost.The main research work includes as following:1. The main methods of desalination are introduced and analyzed, and then the principle and process characteristics of SWRO are elaborated. On this basis, the international development of integrated monitoring system, which is applied in SWRO, is analyzed to clear about this study goals and research content.2. The single unit desalination technology used in LiuHeng SWRO project is introduced and analyzed, and then the hardware equipment and control signals are studied for the design and function realization of SWRO monitoring system. According to it, the design scheme and frame structure of integrated system used in LiuHeng SWRO project are proposed. The integrated system mainly contains three parts: centralized monitoring system, fault diagnosis system and the optimization scheduling system (main component).3. In order to solve the"isolated information island"problem, caused by different hardware devices, OPC (OLE for process control) was studied .Taking advantage of OPC technology the centralized monitoring system could realize integration of the heterogeneous control system easily. Meanwhile radio communication module-EM310 was developed to realize the GSM communication, through it, administers could get water producing information with short message, wherever they are.4. The object-oriented programming and Unified Modeling Language (UML) are both employed to analyze the demand of centralized monitoring system, and then the user management module, database module and real-time data display module were developed according to the specified demand of the integrated monitoring system. The monitoring software which has the functions such as: real-time monitoring, data display, statistical analysis, data query, report generation with reserved interfaces for fault diagnosis and optimized scheduling is realized by .NET development platform combined with C# language and Microsoft SQL Server2005 database on Windows XP operating system.5. Black-box testing and white-box testing are used to test monitor system and each function module. At last further research work is prospected and planned.