On the application of the distributed control system remote I / 0

Abstract: on the application of the distributed control system remote I / 0 reinterprets the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: this paper analyzes the present situation of the application of the DCS remote I / 0 in power plant, this paper expounds the promote the use of remote I / 0 advantage in power plant and puts forward the application range of the remote I / 0. For now the development of bus technology, advantages and existing questions are analyzed, discussed now. More flow meter manufacturers choose model price quote you are welcome to inquire, here is on the application of the distributed control system remote I / 0 reinterprets the article details. This paper analyzes the present situation of the application of the DCS remote I / 0 in power plant, this paper expounds the promote the use of remote I / 0 advantage in power plant and puts forward the application range of the remote I / 0. For now the development of bus technology, advantages and existing questions are analyzed, prospects the application prospect of fieldbus control system in power plant. Zui distributed control system can implement control function is the feature of dispersion, dispersion of the physical location for centralized monitoring. However, since the mid - 80 - DCS application in more than 300 mw unit in our country, people often only scattered attaches great importance to the use of DCS control function of the properties, and about the obvious physical dispersion characteristics can save investment and shorten the construction period, while the practical application of a variety of concerns, and therefore failed to give full play to the DCS should produce the huge economic benefits. 1 DCS layout condition and the remote I/O application status from the current our country domestic DCS has put more than 300 mw unit, the vast majority of plants all the controller processing unit and the I / 0 cabinet concentrate on electronic control floor indoor, the operator station layout in the unit control room, the data communication highway controller with single) C and operator station connected, data communication cable is not a control building, all the I / 0 of the cable to the electronic concentration of indoor I / 0 cabinets. The advantage is relatively low to DCS cabinet protection grade requirement, operation, maintenance condition is good, but the control of large floor area, the large investment. Put the controller processing unit tank scattered in the scene, communication cable connection within the scope of the controller in the plant with the practice of processing unit cabinet, can save a lot of cable, but from the Angle of the unit safety, people think that risk is too big and not be considered. Thus the controller processing unit cabinet decorated relatively concentrated, the remote I/O scattered arrangement scheme became zui preferred choice. Application of remote I/O to factory monitoring with actual operation performance of power plant is zhejiang beilun power plant first phase 2 x600mw unit. The factory in DAS, SCS, BMS, widely used in the remote I/O. Nearly ten years experience has shown that the use of a remote application is successful, the effect of investment saving cable is also significant. During the second phase, however, only keep the distributed control system of circulating water pump house remote I/O, the rest of the main building in the remote I/O is cancelled. The main reason is that in the first phase of construction process, due to the improper construction management, caused in the field of the remote I/O cabinet, the water damaged part of the card, so when determining the second phase of engineering design principles to avoid similar accidents in the main factory building of scattered arrangement cancelled within the remote I/O. In addition, from the current domestic design to production of other units, in addition to the DAS part adopts domestic for intelligent front-end devices such as & other; 893 a network throughout the &; Remote intelligent I/O products, it is no use of the remote I/O control the factory and monitor application examples, the reason is mainly existing in the safety and reliability of the remote I/O. Emphasis on control engineering cost in design unit, under the situation of optimization design, strengthen civilization construction and management in the electric power construction unit today, it is necessary for us to know the DCS physical dispersion and application advantages of the remote I/O. 1 remote I/O application scope according to the application range of the remote I/O can have the following several solutions to choose from: plan a, in DAS, SCS, BMS, MCS four system the application of remote I/O, although at present domestic MCS system available instance is using remote I/O, but from the remote I/O speaking should be fully applicable to the safety and reliability of the MCS, so the author thinks that can be tested in engineering. When the equipment and system protection using DCS to realize, also considering the equipment and the safety of the system, involving the boiler, turbine equipment protection signal should be directly introduced DCSI/O cabinet ( Concentrate on electronic room I/O cabinet) 。 To reduce the number of varieties of spare parts, keep the consistency of the product, which suggested that the remote I/O use the same DCS factory products as much as possible. Scheme 2, only in the DAS, SCS, BMS application system in the three remote I/O. This plan has been mature and use of performance, such as the first phase of beilun power plant. Equipment and system protection principles with solutions. Plan 3, in the DAS, SCS, BMS application system in the three remote I/O, but the DAS system USES some domestic for intelligent front-end device. To control the cost, save equipment investment and obtain zui good price performance ratio, according to the power of sarft 29 nov 1996 planning ( 1996). No. 214 on the unit some technological problem sets 'distributed control system design of the requirements, and other The boiler and turbine metal temperature; The generator coil, iron core, hydrogen gas and cooling water temperature; Auxiliary bearing temperature appropriate USES, such as domestic has experience of successful application of remote I/O channels & throughout; , so consider in DAS system part adopts domestic for intelligent front-end device.

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