Application Comparison of Three DCS Systems in Mawan Power Plant

Abstract: The application comparison information of three sets of DCS systems in Mawan Power Plant is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The total installed capacity of Shenzhen Mawan Power Plant is 6300MW, and the main engines and main auxiliary machines of the six units are the same. Among them, the boiler is the HG-1025/18.2-YM6 type produced by Harbin Boiler Factory and imported from the United States Combustion Engineering Company (CE) technology. Subcritical pressure once intermediate reheat. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application comparison article of three sets of DCS systems in Mawan Power Plant. Total installed capacity of Shenzhen Mawan Power Plant6×300MW, the main engines and main auxiliary machines of the six units are the same, among which, the boiler is the HG-1025/18.2-YM6 type produced by Harbin Boiler Factory with the technology of American Combustion Engineering Company (CE), subcritical pressure once intermediate reheat forced circulation Drum stove. Each boiler is designed with six HP medium-speed coal pulverizers, and the swinging once-through burner is arranged at the four corners of the cut garden for combustion. The boiler MCR working condition burns 126.3T/H of coal. The boiler is designed with three layers of oil guns and uses No. 0 light diesel oil for ignition and low-load stable combustion. The maximum output of the oil system is designed according to 30% of the rated working condition of the boiler. The steam turbine is the N300-16.7/537/537 type subcritical, one-time intermediate reheat, high- and medium-pressure-combined single-shaft double-cylinder double-exhaust reaction condensing steam turbine produced by Harbin Steam Turbine Factory with the technology of American Westinghouse Company. Turbine start-up adopts high-pressure main valve control method. At 2900R/MIN, the high-pressure main valve and the high-pressure regulating valve are switched, and the high-pressure regulating valve controls the speed-up and load-bearing mode. Each unit is equipped with two high-pressure main valves, six high-pressure regulating valves, two medium-pressure main valves, and two medium-pressure regulating valves. The generator is manufactured by Harbin Electric Machinery Factory, and the cooling method is water-hydrogen-hydrogen. Units 1 and 2 use the INFI-90 distributed control system of Bailey Company in the United States, and the two units were put into production in 1993 and 1994 respectively; Taiwan units were put into operation in 1996 and 1997 respectively; No. 5 and No. 6 units adopted the XPDS-400 distributed control system of Shanghai Xinhua Company, and No. 5 unit was put into operation in November 2002. The following three systems are used in the Mawan Power Plant. A simple comparison is made with the design and application of the plant. 1. Comparison of hardware 1. Comparison of network structure High, data communication is blocked when there is a breakpoint and poor contact in the loop. In addition, the communication speed of this ring network structure is also restricted by the speed of the module bus, which makes the communication speed slower. The #2 unit of our factory has experienced many times that the communication is interrupted due to the failure of the coaxial cable, which endangers the safe operation of the unit. The coaxial cable as a communication medium does have its inherent defects. Although PROCONTROL-P adopts a local area network structure, its local area network is still realized by coaxial cable, and the inherent defects of coaxial cable still exist. Since the human-machine interface part and the real-time control system are connected through the server, the requirements for the server are high during operation. Once the server has a problem, the equipment will lose monitoring and control. Our factory once lost monitoring and control of field equipment for more than 20 minutes due to server crash. XDPS-400 uses optical fiber as the communication medium and is designed in the form of double loops, which fundamentally overcomes the inherent deficiencies of coaxial cables. This kind of ring network is a kind of virtual ring network, that is, it is a ring network logic bus physically, and has the function of network self-healing. The computer interface system and the distributed processing unit all use the same communication medium and communication protocol (TCP/IP), which makes the communication hardware and software very simple and clear, and also makes the expansion of the system very easy. 2. Comparison of modules The modules in the PROCONTROL-P14 system are not divided into main modules and sub-modules, and there are no input modules and output modules. Relatively speaking, the types of modules in this system are less. The function and versatility of the module are strong. However, because the PROCONTROL-P system is a combination of P13 and P14, there are more communication modules between the two systems, so in general, there are more modules than INFI-90 and XDPS-400. The types of modules of the XDPS-400 system should be very few if the special modules of the DEH/MEH system are removed, especially the whole system has only one communication interface module, which is enough to show its high degree of integration. The reduction of the corresponding spare parts types is also reduced. In addition, because the XDPS-400 system realizes the way that the system directly drives the field equipment, some intermediate relay cabinets and extended relay cabinets are omitted, the system structure is simplified, and the unit investment is saved.

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