Application of Drum Water Level Protection Logic Transformation in Sanhe Power Plant

Abstract: The application information of steam drum water level protection logic transformation in Sanhe Power Plant is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The first phase of Sanhe Power Generation Co., Ltd. installed two 35OMW units manufactured by Mitsubishi Corporation of Japan. The distributed control system (DCS) adopts MAXlO0O+PLUS of American MCS Company. The boiler protection system consists of 2 control cabinets, called the boiler protection panel (BoilerProtectio. More flowmeter manufacturers select models and price quotations are welcome to inquire. The following is the application article details of the steam drum water level protection logic transformation in Sanhe Power Plant. The first phase of Sanhe Power Generation Co., Ltd. installed 2 sets of 35OMW units made by Japan's Mitsubishi Corporation. The distributed control system (DCS) adopts MAXlO0O+PLUS of American MCS Corporation. The boiler protection system consists of 2 control cabinets, called boiler protection panel (BoilerProtectionPanel, BPP), the boiler protection logic is all realized by relay overlap. The signal input of the external system and the action command of the main fuel trip (MFT) of the boiler are logically calculated through the two panels. The boiler protection includes: manual opening of the boiler , Drum water level, furnace pressure, boiler fire extinguishing, steam turbine trip, supply fan all stop, induced draft fan all stop, lose all fuel, unstable combustion state, reheater dry burning, low total air volume, low differential pressure of boiler water circulating pump, etc. 14 protections. 1. The original steam drum water level protection system 1.1 The original steam drum water level adjustment and protection situation The steam drum pressure and water level measurement schematic diagram is shown in Figure 1. The logic of the original steam drum water level high and low protection is realized as follows: 3 steam drums The signals from the package water level transmitter (HAG1OCL003～HAG1OCL005) and the three steam drum pressure transmitters (HAG1OCPOO2～HAGlOCPO04) are connected to the unit conversion panel (UnitTransducerPanel, UTP) through the distributor, and the other way is connected to the DCS. In UTP, the signals of the three drum water level transmitters are corrected in the pressure correction module after the intermediate value signal selected by the three-pointing module, and the obtained correction value and the set value are compared in the comparator. When the correction value exceeds the range of the high or low setting value, a two-value protection signal of high or low water level in the drum will be sent to the boiler protection panel (BPP), so that the protection relay of high or low water level in the steam drum will act. , and then send a signal MFT to stop the furnace. This is the three-middle logic adopted by the original steam drum water level protection logic. 1.2 The problem of the original steam drum water level protection The original steam drum water level protection logic adopts the three-middle logic. The Twenty-Five Key Requirements for Major Accidents in Electric Power Production stipulates that 'the high and low water level protection of the boiler drum should be independently measured by a logical judgment method of three out of two'. The logic of three out of two and three out of three is based on probability statistics. It is relatively advanced, but in the case of a fault in the input signal, three out of two can automatically perform logic conversion, while three out of the middle cannot, so there is a hidden danger of misoperation. In addition, the unit has experienced drum water level transmission in winter. Due to the freezing of the measurement pipeline, the failure of the device caused the water level protection of the steam drum to be withdrawn from operation, which seriously affected the safety of the unit. 2. The realization of the logic of three out of two for the water level protection of the steam drum The hardware equipment is overlapped to realize the logic of taking two out of three, but due to the distributor in UTP, The force correction module and the high-low judgment module are connected by hard wires to form a binary signal of high water level in the steam drum or a binary signal of low water level in the steam drum. If the transmitter fails, then realize the logic switching of two-to-one and one-to-one, and then decide to implement it in DCS, because DCS has high reliability and can analyze the 4-2OmA DC signal from the transmitter to judge the transmitter. Whether a fault occurs, it is convenient for logic implementation. The contents of the reconstruction plan include: the configuration of DCS input and output points, the layout of the post-adding cables, the realization of the three-to-two logic judgment method for the water level protection of the steam drum, the conversion of two-to-one and one-to-one logic, the display of the screen, and the output of the alarm , inspection measures, etc. Figure 2 shows the analog signal flow of the steam drum water level protection after the logic transformation. The three steam drum pressure signals (HAG10CP002, HAG10CP003, and HAG10CP004) are calculated in the DCS by taking the values ​​of the three steam drum water levels. Signals (HAG10CL001, HAG10CL002, H-AG10CL006) are used for pressure correction calculation, and the obtained correction value and set value are compared in DCS. Low water level binary signal. Refer to Figure 3 for the drum water level protection three-to-two logic judgment, two-to-one logic conversion judgment, one-to-one logic conversion judgment and operator screen (CRT) related alarm output. DCS judges the fault of the water level transmitter, and sends an alarm on the CRT when it detects that there is a problem with the input signal. If none of the three transmitters fail, the protection logic operates in the three-out-two mode.And send out corresponding alarm output on CRT. If all three transmitters fail, the protection logic operates in the protection exit mode, and the corresponding alarm output is issued on the CRT. If there are and only two transmitters fail, the protection logic operates in a one-to-one mode, and a corresponding alarm output is issued on the CRT.

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