Lead: Centralized control mode is the basis of centralized control system operation. The operation modes of centralized control system in thermal power plant are mainly divided into three control modes: decentralized control, hierarchical stage control and communication transmission control. The following is a model essay on the operation and management methods and technical points of the centralized control system in thermal power plants. I hope you like it. For details, please visit (www.oh 100.com/bylw).
With the vigorous development of information technology and network technology, the operation system of thermal power plant is constantly upgraded, and the operation management technology of centralized control system gradually replaces the traditional technical management mode, which greatly improves the safety and stability of thermal power plant. This paper briefly analyzes the operation and management methods and technical points of centralized control system in thermal power plant, for the reference of relevant units.
Keywords: thermal power plant; Centralized control system; Operation; Management; technology
1, Introduction
With the development of computer network technology and information technology, the corresponding integrated circuits and untreated technologies are becoming more and more mature, and the centralized control operation technology comes into being and is gradually applied to thermal power plants, which improves the operation level of thermal power plants, increases the safety factor of thermal power generation, and brings huge economic and social benefits to thermal power plants.
2. Summary of centralized control operation system in thermal power plant.
The centralized control operation system of thermal power plant is called DCS system for short, which is very different from the traditional centralized control system. Centralized control operating system is produced on the basis of increasingly complex process control requirements and large-scale industrial production automation, with automatic processor as the center and intensive automatic control throughout. The combination of centralized control operating system with computer remote control and transmission technology, control technology and information communication technology can not only centralize the operation and display function, but also disperse the load and risk of the operating system, thus improving the operation safety factor of the whole control system, ensuring the safety and stability of power grid operation, and playing an important role in the safe production and management of thermal power plants.
3, thermal power plant centralized control system operation management method
3. 1 Operating conditions of centralized control system
The operating conditions of centralized control system are mainly divided into operating technical conditions and external environmental conditions. Operating technical conditions mainly refer to hardware conditions such as computer remote control and transmission technology and information communication technology, while external environmental conditions mainly refer to conditions such as power supply, control room temperature, grounding device and equipment configuration. The operation conditions of centralized control operation have a vital influence on the operation effect. If the equipment grounding device is improperly installed, it will affect the normal operation of the cable shielding system, and electromechanical and power accidents will easily occur during the centralized control operation of the electromechanical group. Before the operation of centralized control system of generator set, efforts should be made to eliminate the influence of all interference factors and ensure that the technical conditions and external environmental conditions of centralized control operation system are in good condition.
3.2 Rational construction of centralized control system operation mode
Centralized control mode is the basis of centralized control system operation, and the operation mode of centralized control system in thermal power plant is mainly divided into three control modes: decentralized control, hierarchical stage control and communication transmission control. The centralized control mode of decentralized control mode is decentralized. In the process of centralized control system operation, technical functions, risks and loads are dispersed to avoid possible risks and accidents in the process of system operation, and efforts are made to reduce losses caused by risks and improve the safety and stability of system operation. The hierarchical stage control mode is to subdivide centralized control management at the control link and level to realize intensive centralized control management. Communication control mode applies communication technology and means to information transmission management and control process, realizes remote communication control and effectively connects generator sets. When constructing the operation mode of centralized control system, a reasonable system operation mode should be constructed according to the specific application environment and conditions of centralized control system and the actual situation of power plant.
3.3 Enhance the professional skills of technical management personnel
2 1 century is the era of knowledge economy. Under the strong impetus of highly developed information technology, new technologies and applications have gradually penetrated into all walks of life. The demand for energy in contemporary society is increasing day by day, so the demand for thermal power plants is also increasing. With the introduction of new technology, thermal power plants should not only give full play to their technological advantages, but also effectively improve personnel management to adapt to the development of technology. In the process of technical management in thermal power plant, we should standardize technical management methods, strengthen the basic theory training of technical personnel, and combine it with practical application to improve the professional skills of technical management personnel. At the same time, efforts should be made to improve the professional quality of technicians, so as to promote the healthy development of the whole thermal power generation industry.
4. Technical points of centralized control operation system in thermal power plant
4. 1 steam drum water level system control
Theoretically, the current steam drum water level system can realize automatic adjustment, and generally there is no need to change the control strategy. However, there are still some problems in the practical application process, such as the poor linearity of hydraulic coupling and actuator, which is mainly due to the defects in the design and production of actuator, but technicians often emphasize the integral function too much without thinking deeply about the reasons. In order to better improve the quality of system regulation, technicians should first set parameters and eliminate external reasons before analyzing the problems.
4.2 Control of heat engine protection system
When the generator set is abnormal in operation, the heat engine protection system will protect the main equipment and auxiliary equipment through safe shutdown to prevent the equipment from being damaged and protect the current staff. The protection setting value of main engine and auxiliary engine shall be set according to the equipment experience limit value or safety protection value specified by the equipment manufacturer and operation unit. Without the approval of the equipment manufacturer or operating unit, the protection setting value shall not be changed at will, and the protection procedure shall not be revoked or cancelled. If it is really necessary to adjust the protection setting value in an emergency, the relevant procedures should be strictly implemented, and once the emergency is lifted, the protection procedures should be resumed in time.
4.3 superheated steam temperature system control
Superheated steam temperature is influenced by many factors, such as feed water temperature, coal-water ratio or fuel-water ratio, excess air coefficient, slagging on heating surface, etc. When adjusting the superheated steam temperature of the critical unit, the coal-water ratio is used for coarse adjustment, then the primary desuperheating water is used for fine adjustment, and then the secondary desuperheating water is used for fine adjustment. The coal-water ratio signal is usually compared and corrected by the superheated steam temperature of once-through boiler. Theoretically, the superheated steam temperature system can realize automatic adjustment without changing the control strategy. However, in the practical application and operation process, the linearity is not good due to the design and production of the actuator. At this time, the parameters should be adjusted as soon as possible before taking other measures.
5. Conclusion
The application of centralized control operation system greatly improves the safety and stability of thermal power plants and brings great economic and social benefits to thermal power plants. Therefore, we should standardize the operation of centralized control system on the basis of respecting its own laws, strive to solve technical problems, improve the professional skills and technical literacy of technicians, and improve the application level of centralized control system.
References:
[1] Wang, Feng Zerui; Operation technology and management of centralized control system in thermal power plant [J]. Silicon Valley.2013, (12).
[2] Yu Yang; Analysis of centralized control operation system of generator set in thermal power plant [J]. China Science and Technology Information.20 13, (13).
[3] Wang Bin; Discussion on centralized control operation technology of generator set in thermal power plant [J].Intelligence.20 12, (4).
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