Abstract: The enterprise can not do without the survival and development of advanced control technology and information technology integration. To a chemical industrial enterprises in the production process of polypropylene core devices?? Acrylic - water heat exchanger on the DCS-based real-time online monitoring and forecasting system was investigated to explore a real-time online monitoring and prediction systems equipment performance, and build mathematical The specific application of methods to improve the efficiency of each unit of production, reduce production and maintenance costs, improve safety standards, and promote the improvement of the level of production organization. Keywords: real-time, online, monitoring and forecasting, DCS, heat exchanger Plant automation and information with the degree of improvement, PLC, DCS system has achieved a network to share data, which makes a variety of equipment condition monitoring is possible. As the device operating conditions of the frequent changes in the use of artificial methods of observation is difficult to determine the equipment's working condition. Condition monitoring (maintenance) of the method difficult to achieve in the past. Propylene - water heat exchanger is a polypropylene production plant to the important heat transfer equipment, which largely affect the heat transfer performance of devices running the stability, reliability and economy of the production process. As in the production process, heat exchanger, water side (shell) or the material side (propylene, the tube) of the scale or the pollution could cause the increase in heat resistance, resulting in parameters not meet the technical requirements and recycling a significant increase in power consumption of water. To avoid such problems, usually when the regular maintenance cleaning of the heat exchanger, but it requires parking to be installed, thereby reducing the effective work of the unit of time, resulting in a lot of waste. If the device is running in a heat exchanger to judge the work of the state, and accordingly develop maintenance plans, you can fully extend the equipment's maintenance cycle, reducing maintenance costs, more importantly, reduce equipment downtime, increase production process economics. Real-time data can be based on polypropylene, propylene - water heat exchanger running for state monitoring and analysis and performance prediction, stands ready to provide heat exchanger performance indicators, their long-term change in trend forecasting, and to develop appropriate maintenance program. 1-line monitoring and forecasting system architecture Line heat exchanger performance monitoring and forecasting system, the function defined as follows: Data acquisition functions: software with real-time system from the data access mechanism for heat exchanger; Computing: Based on available data and basic theoretical model of heat exchanger, heat exchanger software with computing technology indicators; Forecasting functions: software with the classical statistical theory and history based on the heat exchanger performance data to predict the function; software based on Gray with the statistical theory of short-term prediction of heat index function; Network function: the software can be authorized in the implementation of the factory site, the user can access to real-time heat exchanger performance data and historical data, and can predict the above-mentioned indicators; Alarm: When the performance beyond the boundaries set by technology, should send alarm information in a timely manner. 1.1 System Test points Propylene - water heat exchanger process objective is to achieve high propylene initial cooling and liquid separation, and then go to the next process. Figure 1. Specifications: 1) data acquisition cycle heat exchanger materials, generally not more than 30s, material thermal properties and heat exchanger performance calculation period is not more than 25s; 2) historical data recording period 1min, retained for 5 years; 3) status reports, and important changes in recording long-term preservation; 4) software system to operate under the local network environment, response time less than 10s; 5) data collection and analysis of the reproducibility of not less than 95%; 6) support the authorization of multi-user queries.
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