The application of steam drum water level protection logic transformation in sanhe power plant

Abstract: the drum water level protection logic transformation in sanhe power plant the application of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Sanhe power generation limited liability company issue installed 2 sets of 35 omw Japan mitsubishi company manufacturing unit. Distributed control system ( DCS） Using the MCS company MAXlO0O + PLUS. Boiler protection system, which is made up of two surface control cabinet, known as the boiler protection plate ( BoilerProtectio。 More flow meter manufacturers choose model price quote you are welcome to inquire, here is the drum water level protection logic transformation in sanhe power plant details in this paper. Sanhe power generation limited liability company issue installed 2 sets of 35 omw Japan mitsubishi company manufacturing unit. Distributed control system ( DCS） Using the MCS company MAXlO0O + PLUS. Boiler protection system, which is made up of two surface control cabinet, known as the boiler protection plate ( BoilerProtectionPanel BPP) All with the relay protection logic, boiler lap. Outside the system of signal input and boiler main fuel trip ( MFT） The action command after the two sides set ark logic operation. Boiler protection, including: manual brake, drum water level, furnace pressure, boiler fire, steam turbine trip, and stop all blower, induced draft fan stop all, lose all fuel, the state of combustion instability, reheater dry, total air volume is low, furnace such as poor water circulation pump down 14 protection. 1 a, the steam drum water level protection system. 1 original steam drum water level control and protection of the drum pressure, water level diagram in figure 1. The steam drum water level of high and low protection logic is this: 3 steam drum water level transmitter ( HAG1OCL003～HAG1OCL005） And three drum pressure transmitter ( HAG1OCPOO2～HAGlOCPO04） To signal all the way through the distributor access unit conversion plate ark ( UnitTransducerPanel UTP) All the way, the other access to DCS. In UTP, 3 steam drum water level transmitter signal after three take module to select the intermediate value of signal from the pressure correction module in the amended, revised and value comparison in the comparator, if revised more than high or low value range, a steam drum water level of steam drum water level high value or the low ark of binary signal to boiler protection plate ( BPP） , make the steam drum water level of steam drum water level is high or low protection relay action, which in turn signals MFT boiler stop. This is the original steam drum water level protection logic using three take logic. 1. 2 original steam drum water level of steam drum water level to the problem of protecting the original protection logic using three take in logic, the logic implementation process and the prevent power production major accident of 25 key requirements of the regulations' boiler steam drum water level is high, the low protection should adopt independent measurement of the three choose two logical judgment way '. Take three choose two or three in the logic are advanced on the probability and statistics, but under the condition of the input signal is fault, can automatically logic transformation, three choose two and three are not in, thus occurs misoperation of hidden dangers. In addition, the unit for measuring steam drum water level transmitter pipe freezing winter happened caused by fault, the steam drum water level protection had to drop out of the running, seriously affected the safety of the unit. Second, the steam drum water level protection logic three choose two set at the beginning of the implementation of the scheme using the original hardware of UTP lap for three choose two logic, but as the distributor in the UTP, three level of module, pressure correction module, judging module through the hard line connection, form the steam drum water level of steam drum water level high value or low in binary signals to the BPP steam drum water level protection relay logic operations, more cumbersome, and the distributor can't judge fault in the transmitter, then realize the take a, take a logical switch, after implementation in DCS, because of the high DCS reliability, and for the transmitter to 4 ~ 2 oma dc signal is analyzed, to determine whether a transmitter fails, facilitate logic implementation. Retrofit scheme includes: DCS configuration of input and output points, and the layout of the cable, steam drum water level protection after three choose two logic way of implementation, the two take one and take a logical transition, picture display, alarm output, inspection measures. Steam drum water level protection logic three choose two after transforming analog signal process shown in figure 2. Three drum pressure signal, HAG10CP002、HAG10CP003、HAG10CP004） In DCS through three take value after operation, respectively of the steam drum water level of three signal ( HAG10CL001、HAG10CL002、H- AG10CL006） Pressure correction algorithm, revised and value comparison operations in DCS, if the scope of the revised more than the set value of steam drum water level of steam drum water level high value or low is formed binary signal. Steam drum water level protection three choose two logic, two take a logical conversion judgment, a take a logical judgment and operator ( CRT） The alarm output in figure 3. DCS fault judgment of water level transmitter, when there is something wrong with the input signal is detected, issued a warning on the CRT. If three transmitter have no fault, the protection logic operation in three choose two ways, and sends the corresponding alarm output on the CRT. If three transducer failure occurs, the protection logic operation in protecting exit manner, and sends the corresponding alarm output on the CRT.

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