Application Experience of XDPS-400 Distributed Control System in MCS System of Mawan Power Plant #5 Unit

Abstract: The application experience information of XDPS-400 distributed control system in the MCS system of Mawan Power Plant #5 unit is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The planned installed capacity of Shenzhen Mawan Power Plant is 4 sets of 300MW coal-fired units, which are the continuation project of Shenzhen Mawan Power Plant. The 4 units were constructed in two phases, and the unit numbers were continued from the #1 and #2 units of the Mawan Power Plant. The #3 and #4 units of the first phase of the project were built in 1996 and 199, respectively. You are welcome to inquire for more flowmeter manufacturers to select models and price quotations. The following is the application experience of the XDPS-400 distributed control system in the MCS system of the #5 unit of Mawan Power Plant. The planned installed capacity of Shenzhen Mawan Power Plant is 4 sets of 300MW coal-fired units, which are the continuation project of Shenzhen Mawan Power Plant. The 4 units were constructed in two phases, and the unit numbers continued to #1 and #2 in Mawan Power Plant. The #3 and #4 units constructed in the first phase were put into operation in 1996 and 1997, respectively. The #5 unit of the second phase project has been put into operation in November 2002, and the #6 unit is planned to be put into operation in 2003. Mawan Power Plant #5 and #6 units are domestic imported 300MW coal-fired units, the main engine is the products of the three major power plants in Harbin, the boiler is a forced circulation drum boiler, and the pulverizing system is equipped with six medium-speed coal mills, direct-blown Milling System. The unit is equipped with two steam-driven feed pumps of 50% capacity and one electric feed pump of 50% capacity. The DCS system of the second phase of the project adopts the XDPS-400 distributed control system produced by Shanghai Xinhua Control Engineering. The functional coverage includes DAS system (data acquisition system), MCS system (analog control system), FSSS system (burner management system) , SCS system (sequential control system), DEH system (steam turbine digital electro-hydraulic regulation system), MEH system (small steam turbine control system) and ECS system (electrical control system). The software configuration and on-site commissioning and commissioning of the MCS system are undertaken by Guodian Thermal Engineering Research Institute, which includes a simple-configured electric bypass control system. The control range, software and hardware configuration of the MCS system in the #5 and #6 units are exactly the same. Only the #5 unit that has been put into production will be described in the following description. The MCS system occupies three DPUs (Decentralized Processing Units) No. 16, No. 17 and No. 18 of the DCS system. The No. 16 DPU mainly completes the automatic adjustment of the main control system, fuel system, primary air system and pulverizing system of the unit. No. 17 DPU mainly completes the automatic adjustment of air supply system, induced air system, auxiliary air, fuel air and fuel air control system. No. 18 DPU mainly completes main steam temperature, reheat steam temperature, boiler main feed water control, deaerator water level and pressure Control, condenser water level control, #1-#3 high pressure heater and #5-#8 low pressure heater water level control system and automatic adjustment of high and low pressure bypass. Other simple single-loop regulating systems are scattered in No. 16 and No. 17 DPUs, and the entire unit has only 6 sets of base-type regulating systems. Mawan Power Plant #5 unit has successfully passed the 168-hour full-load trial operation on November 1, 2002. At the beginning of the 168-hour trial operation of the unit, including the machine-furnace coordination control system, which represents the highest level of automation of the unit, has been delivered to the operators for normal operation, the investment rate of the automatic adjustment system has reached 100%, and the adjustment quality has reached the 'Basic Construction Project of Thermal Power Plants'. Start-up and Completion Acceptance Regulations. During the whole trial operation of the unit, there was no unplanned shutdown accident, and the early and reliable input of the MCS system played an important role in the safe and stable operation of the unit. Let's talk about the author's experience of XDPS-400 distributed control system in the process of software configuration and field debugging of MCS system of #5 unit. 1. High hardware reliability From the moment when the DCS system on-site cabinet is powered, each DPU and I/O module has been in working state until the unit is handed over to production after the 168-hour trial run. Among the hardware used in the MCS system, only the In the output modules used in the control loops of the #2 high and #3 high water drain gates, 3 analog output channels have been damaged successively (suspected to be caused by the local junction box entering the strong electricity), and all other hardware are working normal. The accuracy of some I/O modules was checked on the spot, and all of them met the factory regulations of Xinhua Company and the contract requirements signed with the owner. Generally speaking, the security of DCS system hardware is much more threatened during infrastructure construction due to rush schedule and cross-operation than during normal production. XDPS-400 distributed control system can achieve such reliability, which proves that its system hardware is trustworthy. 2. The control cycle is short Before the decentralized control system was adopted, the MCS system was actually an uninterrupted continuous process control. After adopting the distributed control system, since the computer has multiple tasks to respond to, and each control function module needs to be calculated in a certain order, a problem of a control cycle has arisen. In theory, the shorter the control period is, the closer it is to continuous control, and the easier it is to ensure the accuracy of the control system.

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