The whole plant automation design scheme of 1000MW unit

Abstract: The information of the whole plant automation design scheme of the 1000MW unit is provided by the excellent manufacturers of flowmeters and flowmeters. In November 2004, the first 60OMW supercritical unit designed and manufactured in China was put into commercial operation at Huaneng Qinbei Power Plant. In November 2006, the first domestic 1000MW ultra-supercritical unit was put into commercial operation in Huaneng Yuhuan Power Plant. For automatic control, from 60OMW units to. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the article details of the 1000MW unit-wide automation design scheme. In November 2004, the first 60OMW supercritical unit designed and manufactured in China was put into commercial operation at Huaneng Qinbei Power Plant. In November 2006, the first domestic 1000MW ultra-supercritical unit was put into commercial operation in Huaneng Yuhuan Power Plant. For automatic control, from 60OMW unit to 1000MW unit, although the technological process has not changed, the characteristics of the control object have become more complex. In addition, due to the increase of unit capacity, the requirements for the safety, reliability index and control performance of unit operation are higher, and this change is different from the control of 30OMW subcritical unit to 600MW subcritical unit, and the change makes the control technology level higher. The amplitude increases, which causes the variability and complexity of the whole process control strategy of the unit. Therefore, this paper takes the 1000MW unit as the object of discussion, proposes the automation design scheme of the 1000MW unit, and discusses the scheme. 1. Plant-wide automation planning According to the requirements of plant-wide monitoring, information sharing, intelligent process data processing, and expertization of the production guidance system, the plant-wide automation is planned. The whole plant monitoring and analysis system is planned to be composed of plant-level monitoring information system (SIS), DCS, electrical plant-wide network control system (NCS), plant-wide auxiliary workshop monitoring network (referred to as auxiliary network) and desulfurization decentralized control system (FGD-DCS). ) 5 parts, and is networked with the whole plant management information system (MIS) to realize the decentralization of process control functions, centralized information management, data classification and processing, and intelligent and knowledgeable production guidance information. 2. Discussion on unit automation design scheme 2.1 New problems in design The centralized monitoring of the workshop and the improvement of the production capacity standard of the whole plant have put forward higher requirements for the automation level of the unit and auxiliary workshop. (2) Expansion of monitoring range of unit units The improvement of automation and informatization level of 1000MW units will inevitably lead to the expansion of DCS monitoring range of units. (3) Increase of I/0 points and communication interfaces The expansion of the monitoring range of 1000MW units and the complexity of control objects make the I/0 points and communication interfaces of the system increase. The I/0 point of a 1000MW unit is about (11000~12000) points, which is about (3000~4000) points more than that of a 600MW unit. The increase of I/0 point and network communication interface puts forward higher requirements on the performance of DCS control. (4) The scale and monitoring scope of auxiliary network I/0 are increased. The centralized monitoring of the whole plant requires that the main auxiliary workshops in the plant cancel the on-site duty personnel, and only retain the on-site commissioning and maintenance station and individual short-term on-site control rooms (for infrastructure commissioning), This expands the monitoring network of the auxiliary workshops of the whole plant, so that the auxiliary network controlled by the whole plant can replace the traditional independent monitoring network of water, coal and ash. The auxiliary workshop control of the whole plant has transitioned from the traditional local relatively centralized control mode to the centralized control of the whole plant. The increase of I/O points and network communication interfaces has put forward higher requirements for the performance of the PLC control network system used for auxiliary equipment control. . Using general monitoring software and centralized database management, the mode of secondary conversion of PLC process data and monitoring library information on the man-machine interface has been difficult to meet the monitoring and data analysis and processing requirements of large-capacity unit auxiliary workshops, auxiliary equipment control The system adopts integrated monitoring and distributed database, which has become the development trend of auxiliary equipment control optimization design. (5) The selection of source parts will become a design difficulty. Since the temperature of the main and reheat steam of the 1000MW unit exceeds 600 °C, especially the main steam pipeline not only has a temperature of more than 600 °C, but also has a pressure of more than 25MPa, so the temperature and pressure of the temperature and pressure will be more than 25MPa. Source components are quite different from subcritical parameter units. In order to eliminate the large thermal expansion of the temperature measuring tube base and the thermowell at high temperature, and considering the strength and life requirements of the metal under the ultra-supercritical parameters of the 1000MW unit, it is most suitable to use the same material for the thermowell as the base material of the pipeline; The instrument sampling pipe in front of the primary gate also uses small-diameter pipe fittings of the same material as the base material of the pipeline, which increases the difficulty of the procurement of pipe fittings, casing processing, and on-site welding processes. With the increase of the capacity of the unit and the improvement of the pressure and temperature parameters, higher requirements are also put forward for the preparation method and selection of the instrument valve, especially the primary valve.

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