DCS Control System Research Articles

Research on Intelligent Water Treatment Strategy based on DCS Control System

Abstract In a capacity renovation project, the new DCS system as the equipment control system, and the existing AB 1756 series PLC system, there are two control systems bi-directional signal monitoring problems. This paper compares two methods of monitoring bi-directional data transmission, and analyzes and verifies the advantages and disadvantages of the two methods. From the perspective of reliability and safety of implementation, a protocol special communication card was added in the PLC controller card slot of desalination plant, and added a protocol-specific communication card to the PLC system card slot of the secondary reverse osmosis and EDI units. The actual project verification shows that this method can ensure reliability and safety performance while realizing functions.

Implementation of Siemens S7-1200 PID Control on Festo Labvolt 3531 Plant Level Controller with Topkapi SCADA Using Modbus Communication Protocol

Plant Festo LabVolt 3531 is a DCS, SCADA and process control system trainer based on the Allen Bradley Controllogix 5572 PLC and Factorytalk View SCADA. This research aims to provide another controller solution that can be used on the Festo Labvolt 3531 plant besides the Allen Bradley Controllogix 5572 PLC and FactoryTalk View SCADA. So that students have alternatives and variations of other technologies in learning. In this research, the Siemens S7-1200 PLC was used as a replacement for the Allen Bradley Controllogix 5572 PLC and Topkapi SCADA as a replacement for FactoryTalk View SCADA. As validation of the test, PID control was used to regulate the water level in both tubes at the Festo Labvolt 3531 plant. The test results for several specified height levels showed that the Siemens S7-1200 PLC with PID control integrated into Topkapi SCADA using the mobus communication protocol was successfully implemented , where the resulting control response has an average steady-state error of less than 2% and the delay between the interface and the device on the plant is 0s.

RESEARCH ON CYBER SECURITY COUNTERMEASURE TECHNIQUE OF SAFETY DCS IN NUCLEAR POWER PLANT

Cyber security event is one of the main concerns in instrumentation and control system of nuclear power plant, since the application and popularity of digital technology in industrial control area. To ensure the cyber security of safety DCS control system of nuclear power plant, this paper analyzes the security risks and vulnerabilities of field control systems, and proposes the cyber security plan for safety DCS platform. Combining with the point-to-point data flow model and the R&D of safety DCS platform, we depict the application of cyber security strategy in the product design stage.

The Study of the Lock Hopper Control System

This thesis is the introduction of a certain Petro-chemical factory about the locked block hopper control system of reforming equipment. The equipment is controlled by the American TRICON control system completes together by American Honneywell DCS. installment's hard core - The catalyst regeneration unit and the unit interconnection part's control is completes in the TRICON control system, the data passes to the DCS control system through the serial port, the operators can monitor the situation. This design concept is applicable in the complex programmed control and operation in refinery.

The Design of DCS Control System in the Production Process of Argon-Oxygen Refining Ferroalloy

According to the characteristics of argon oxygen refining ferroalloy production process, design two lays control structure. The first lay is centralized monitoring level, adopte dual-CPU IPC to deal with the complex data operations and centralized monitoring operations. The second lay is process control level, use S7-300 PLC of siemens series, the control system is divided into six subsystems. The subsystem and the central controller share with three sets of PLC, to carry out automatic control for the devices of production line. And complete DCS control system design of argon oxygen refining ferroalloy production process, the system have been put into production, stable and reliable, build a hardware platform to achieve energy-saving control strategies of production process.

DCS Simulation Modeling and Development for Ethylene Cracking Plant

On the basis of the analysis of ethylene cracking process, equipment, process control and operation conditions, using process control system simulation platform, Ethylene cracking plant DCS modeling and simulation training system were developed. Using continuous modeling method, combined mechanism modeling with test data analysis, DCS control system mathematic model was established, by which normal operation, start,shutdown process and accident treatment process were simulated. The online evaluating system was developed too, which supply a virtual platform for the training of ethylene cracking process.

The Design and Application of DCS in Control System for Ceramic Kiln

For the characteristics of control system for ceramic kiln, a new high-reliability control system is presented in this paper, using a hierarchical configuration, the DCS control system for three subsystem is designed, The temperature and atmosphere of kiln are controlled by fuel metering and air fuel ratio with computer and PLC, the structure and software design of the system are introduced, It is an advanced control technology. It’s validity is verified in a practical kiln monitor and control system. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Design of Steeping Control System for Corn Wet Milling Process

In order to increase starch yield, it is important to adopt counter-current steeping method and control the steeping temperature under limits which is appropriate for corn wet milling process. Firstly, the configuration of steeping temperature control system and steps of counter-current steeping for corn wet milling process is introduced in this paper. Secondly, the hardware design of steeping control system for corn wet milling process is developed. As a part of starch production DCS control system, a C/S structure which using industrial computer as upper computer and using S7-400 PLC as lower computer is adopted. Finally, the steeping temperature control program based on fuzzy-PID control and algorithm of automatic steeping is presented. The real-time operation shows that the control system given by the paper can meet the requirements of corn steeping production.

DCS Control on Melamine System

The composition and working principle of DCS control system is introduced, as well as Configuration，function and basic language. The design proposal of control system on melamine is related, and its advancement and importance of cascade control is further elaborated. Nowadays, the whole control rate can reach above 95%, which can lower labor intensity and improve working environment.

PETROLEUM PROCESSING PLANTS—TECHNICAL SURVEILLANCE PROGRAM

On behalf of itself and BHP-B, Esso operates offshore production platforms in Bass Strait, a crude stabilisation and gas processing plant at Longford and a LPG fractionation plant at Long Island Point, Victoria. The Technical Surveillance Program for these facilities is implemented at both the Operator and Engineering levels. The program has been enhanced by building on existing DCS process control and process information (PI) systems and through development of a more structured engineering monitoring system. The enhanced program continues to register tangible benefits in integrity, product quality, recovery, efficiency and reliability and capacity.At the operator level, the process is monitored continuously, assisted by process alarms to maintain the plant within the normal desirable operating zone. Safe operating limits define the outside boundary of the safe operating envelope which is secured with shutdown and other automatic protective devices. Alarm and limit conditions associated with these parameters have been incorporated into the DCS control system with pre-defined operator responses appearing automatically on the screen if the condition is reached.At the engineering level, the surveillance program is a systematic periodic monitoring process focussing on optimum performance and continuous improvement. It is structured using the elements of a management system. Within this framework, engineering spreadsheets have been developed with direct links to process data via process information system software. The spreadsheets assist plant engineers to efficiently monitor the key performance variables; they also pre-define the acceptable operating range, calculate statistical performance, highlight deviations and hyperlink back to the PI system for more detailed troubleshooting. Day-today deviations and performance improvements are fed back and reviewed at the working level, more significant issues are formally investigated and reviewed with management. Key data and overall performance is summarised monthly, and formally reviewed by plant and engineering management.