Completed in August 1999, the duration of the project is 60 days. After the transformation, the equipment was successfully started, the unit was unloaded, and the net load was completely controlled in the control room. Since the operator station uses the Jia 10013 operating system, the man-machine interface is very friendly, and all operations can be completed with the mouse on 01. The entire system software is open, hardware types are few, and versatility is strong. It is easy for users to add other auxiliary functions. Through the transformation, the operation is simplified, the reliability of the equipment is improved, and all the control indicators meet the ministerial standards. After a few months of abnormalities or obstacles, the effect of the transformation is ideal. 2.1 Improve Equipment Reliability The example system uses dual-loop power supply and the road is taken from the factory. 3 power supply, road access from the thermal security section, two-way power to achieve non-disruptive switching. In this way, the possibility of downtime due to the loss of power from the 00-man 3 system is greatly reduced. In addition, when the electrician specializes in overhauling the power supply equipment, as long as it is performed in sections, a reasonable power-off operation will not affect the normal operation of the system. Control system internal power supply card signal 0. Both are redundantly designed to ensure high reliability of the system, and it is convenient to perform online repair and replacement of almost all equipment during operation. Pure ESC control, each steam inlet valve includes high and medium pressure main valves, and high and medium pressure control valves are independent control loops. Any component failure in the valve control loop will only affect the valves, which will have little effect on the unit load. All control components can be repaired and replaced on-line, and the valve can be put into operation after the fault is completed. Add on-line testing capabilities to critical equipment and loops. Such as the detection of a hydraulic pressure switch on-line test; tripping protection of the implementation of parts 31 solenoid valve test only low pressure oil pump interlock test; various steam inlet valve activity test and so on. All tests are completed on the 0-inch dia. by selecting the corresponding test button. The operation is simple, the test method is completely simulated, with high reliability, and the test will not affect the load. The unit 103 is over-speed and the mechanical over-speed test can be performed through the 0,1 system. The original mechanical emergency breaker is retained in the front box of the steam turbine, and the interface with the high-voltage emergency shutoff system is realized through the diaphragm valve. In this way, the mechanical overspeed protection device remains, increasing system safety. Historical data stations use large-capacity hard disks. All online parameters can be collected through the historical data collection function. The storage time only depends on the hard disk capacity. In addition, the engineer station installed a touch 0 drive, an elbow 0 disk with a usable capacity of 640 cubits, and regularly copies all data for offline custody, providing detailed data for annual operational analysis. 10 sensors used for valve opening feedback, specially designed and made of high temperature resistant materials, the long-term working temperature can reach 90. 3 After several transformations and experience reforms, the relationship between the opening degree of each regulating valve is accomplished by the control system mimicking the original cam valve mechanism, so the control characteristics are not completely equal to those before the transformation. In the process of revolution, in order to make the steam turbine circumference inflow, the force is even and generally adopt single valve control, which is different from the multi-valve rush start when the liquid is adjusted. At the same time, the parameters of the revolution should be adjusted accordingly. After the completion of the transformation of the Menxia Power Plant, the first start-up conversion parameters are the main steam pressure 52 and the steam temperature 380. Due to the high parameters, although the speed control accuracy meets the requirements, the valve opening curve is not ideal. When the first unit starts rushing, the revolution parameters are adjusted to the main steam pressure 3.43, the main steam temperature 320 reheat steam temperature 237 弋, because the parameters are lower, the disturbance caused by the steam pressure fluctuation is smaller, and the valve is prevented from opening. The degree of fluctuations. After 00, the initial load setting during grid-tied is very close to the steam pressure parameter before grid-connected. Based on theoretical calculations and several experience of grid-connected reforming, the main steam pressure before grid-connected should be greater than 4, and the reheat steam pressure should be less than 0.25, must be strictly controlled, otherwise it will make the full-opening of the medium-voltage control door before the grid connection or the moment of full opening of the grid connection, which will cause the sudden increase of the steam inlet volume of the medium pressure cylinder and endanger the safety of the unit. In order to shorten the oil circulation time after the transformation, we must ensure the welding quality. Pipe cutting should be carried out with a pipe cutter, and each pipe and fitting must be carefully cleaned. All joints are welded by argon arc welding. The welds of all pressure oil pipes are to be conducted and ray inspections are performed. In the latter part of the oil cycle, an external border filter 8200 oil filter is used for bypass online processing. In this transformation, all the cables on the oil motive adopt the high-temperature flame-retardant fluorine plastic sheathed cable with a long-term working temperature above 200, and all the cables in situ to the control cabinet adopt 105 smoke-free flame-retardant 003 cables to ensure the control signals. Long-term reliable transmission. China's first 800 kilograms of Jiaqi turbine generator units was successfully connected to the grid. China's single-capacity turbo-generator unit with the highest domestic technological capacity in China The 800-megawatt-jiao unit of the Suizhong Power Plant in Liaoning Province was successfully connected to the grid at the end of 1999. The construction of the Suizhong Power Plant, which is the main project undertaken by Liaoning Power Engineering Company, is a key project of the national plan. It is planned to install 4 units with a total capacity of 3,200 ft. The project will install two 800-kilometer-plus supercritical units made in Russia. The total installed steel structure and electromechanical equipment will have a total weight of 230,000. The power plant also marks a new level for the installation of thermal power units in China. Excerpted from China Power 2000.7 Stainless Steel Hebei Qianmu Fastener Manufacturing Co., Ltd , https://www.qmjgjfasteners.com