Project background and process summary
Third Prize of China Huadian Group Science and Technology Progress Award
The 2x660MW air-cooled unit project of Huadian Tuyou Power Plant was re-opened by the National Development and Reform Commission in March 2014, in response to the national requirements for reducing staff and increasing efficiency and improving labor productivity. During the infrastructure period, it was decided to carry out research and implementation of the application of the DCS integrated control system.
The whole plant DCS integrated control system has been implemented for 18 months from implementation to production, achieving the expected implementation effect, and truly achieving the control mode of the whole plant DCS large centralized control.
Project Background and Objectives - Improve Market Competitiveness
At present, the main plant of 600MW and above basically adopts the decentralized control system to implement centralized control of furnace, machine and electricity. 1~2 omnipotent duty attendants can be set up, plus 1~2 on-site patrol personnel can meet the unit start-up. Normal operation and handling of accident conditions. There are still many modes of control in the auxiliary workshop, and there is still room for optimization. The auxiliary workshop adopts the DCS monitoring system based on computer technology, and builds a plant-wide monitoring and management information system network together with the DCS of the main plant, which has become the need of new power plant construction.
- The real "big control"
The DCS integration of other domestic power plants has not achieved the true integration control. Most power plants have their own electric dust removal and hydrogen production stations using local PLC control or DCS systems with different brands from the mainframe. Huadian Tuyou Power Plant will electrify the electricity. Hydrogen production is also included in the DCS control system to achieve centralized control of DCS in all subsystems such as chemical water, intermediate water, industrial wastewater, coal transportation, ash removal, electric dust removal, desulfurization, denitrification, and ammonia.
- saving labor costs
According to the "National Electric Power Company Thermal Power Plant Labor Standards", the operating standards of two sets of 600 MW units in Class B units are: 66 people in the control room, 17 people in the chemical industry, 11 people in dust removal and ash removal, 15 people in desulfurization, a total of 109 people. After the integration of the whole plant DCS, after the implementation of the “large centralized control” mode, the chemical, ash removal, dust removal and desulfurization control rooms of the Tuyou Power Plant were cancelled, and 15 additional personnel were installed in the centralized control room. The crew of the unit was: 86 people, saving 23 people. , effectively reducing the cost of human resources.
- protection of the ecology
The project has improved the level of environmental protection equipment, realized environmental protection data, reliable storage and data sharing. Realize environmental protection equipment trip interlocking host tripping. The dedicated historical station of the desulfurization setting stores the environmental protection historical data, and the environmental protection data enters the storage of the historical station of the host to achieve double redundant backup. The host and the environmental protection operators monitor the environmental indicators data in real time to avoid the occurrence of super-circulation environmental incidents caused by untimely communication.
- Reduce maintenance costs
After the integration of the whole plant DCS, maintenance personnel only need to concentrate on mastering one system, and the hardware of each system is unified, which greatly reduces the variety and quantity of spare parts, thus reducing the cost of spare parts, which is converted into RMB 76596.97. At the same time, because only one system can be learned, equipment maintenance personnel can be improved and the maintenance level can be improved.
- Optimization of performance indicators
Soot blowing program control and DCS integration, the soot blowing function is realized in DCS, and the advanced application software of DCS system is used to realize soot blowing optimization and improve boiler efficiency.
DCS is integrated with DEH, ETS and MEH. DEH, ETS and MEH operate independently. They are managed by DCS. The data transmission of DCS and DEH, ETS and MEH is smooth, and the reliability is further improved.
The entire factory clock is synchronized. The DCS system only receives one GPS time-to-time signal, which realizes the operation monitoring and accident fault analysis of the whole system in the GPS time base to ensure safe operation and improve the operation level.
Emerson Total Solution
As the supplier of the whole plant DCS integrated control system, Emerson provides a complete Ovation expert control system to realize the DCS integrated design of the whole plant host and auxiliary control (desulfurization, water, coal, ash removal, etc.). The program, and actively cooperate with the installation and commissioning, and finally realize the DCS integrated control system of the whole plant.
In order to meet the special circumstances of commissioning and operation of various auxiliary workshops during the construction of the power plant, the configuration of the auxiliary control system provided by Emerson, including the engineering station, operator station, controller, network planning, etc., can meet the auxiliary control. The demand for the system to be put into operation in stages can also achieve centralized monitoring after the completion of all systems. During step-by-step debugging or overhaul (especially when adjusting the control strategy), it will not affect the normal operation of other system equipment of the auxiliary workshop control system.
Emerson's Ovation control system has excellent performance in terms of system redundancy, network communication capability, and ability to handle complex control algorithms with its real-time, reliability, and openness. Its integrated network and control equipment ensure greater assistance. The centralized operation control system operation and maintenance performance of the workshop provides a guarantee.
The centralized control room operator station is beautifully arranged.
The coal handling and chemical water operator stations in the centralized control room are clear to the scene.
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