With the continuous development of social economy and science and technology, the production scale of air separation equipment is getting larger. As an important part of the whole air separation equipment, automatic control system develops from the original instrument control system to PLC automatic control system, then develops to the DCS, CCS, SLS and AMS control systems which widely used nowadays. With the improvement of social awareness of energy and environmental protection, the advanced control system is used to realize the optimization of air separation equipment, and the control technology of automatic load changing to realize energy saving and consumption reduction is also emerged.
- DCS (distributed control system): The DCS operation system fundamentally overcomes the shortcomings of single function and decentralized operation of conventional analog instruments. It integrates controlling, displaying, computer and communication technology to realize decentralized control and centralized operation. With its characteristics of flexible configuration and convenient configuration, it realizes diversified control strategies to meet the needs of users in different situations.
- CCS Comprehensive control system of compressor unit: The air compressor, booster and driving turbine adopt the special "comprehensive control system of units" that independent of DCS system. Through CCS operating station, the inside unit equipment can be started / stopped remotely, or can be alarmed and monitored in detail, and can also be connected with the main control system DCS Data communication.
- SIS safety interlock system: The safety interlock of compressor is realized by SIS. The system can distinguish the first accident, send out audible and visual alarm and interlock, and also can print events out according to the sequence, so as to analyze the causes. SIS safety interlock system is independent of DCS system.
- AMS intelligent equipment management system: AMS is a factory management system for maintenance, calibration and fault diagnosis of on-site instruments and control valves.It is an integral part of the enterprise's maintenance and diagnosis system. It has an interface for communication with third-party software, which is used for advanced equipment diagnosing, performance monitoring and maintenance and test planning.
- Automatic load changing system: Under the premise of ensuring product quality and stable operation of equipment, it can effectively realize automatic load tracking and regulating in the full process. That is to say, according to the subsequent change of product consumption, the opening of air compressor inlet guide vane is adjusted automatically or manually, and the parameters such as flow, liquid level, expander expansion are adjusted automatically in the process flow of air separation equipment, and the optimal control scheme and control set point among relevant variables are set, so as to minimize the energy consumption of equipment.
The remote monitoring system of air separation equipment independently developed by DEAR air separation company, through the application of advanced air separation equipment control system, completes the data collection of monitored air separation equipment in the remote control center, including the operation signal, operation data, output information, system parameters, fault signal, trend signal of gas and liquid products, and key signals processed by the control software, etc., to provide customers with more timely and accurate technical support , early detection of possible problems, and timely process. The operation convenience and safety of air separation equipment are greatly improved.
