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Power Plant Steam Turbine Bypass Control System and Implementation of regulation and protection principle

Load the main steam pressure drops, the main steam flow is less than K4, P. Setting allows the decline. K2 is used to set the value of main steam pressure set up rate. K5, K6 for 谩 main steam pressure set the upper limit set value, when the unit into the rated operating conditions, the main steam pressure set to limit the rise in value. Value curve of the pressure determined by the unit operation, it is because of the requirements of the different units to form a pressure value of the loop in the different control systems is also different. Figure 2 shows a pressure value and the main steam pressure and high pressure bypass the blood line of the corresponding opening. 2.2 Low pressure bypass pressure regulator is the role of the bypass pressure regulator with high pressure bypass action. Adjust up and running again when the hot steam pressure, sliding pressure to press the unit,mbt schuhe koeln, under the constant pressure mode to run the curve. The structure of the system with high pressure bypass pressure regulator similar structure is formed by the constant pressure regulator circuit and the PI and other aspects of composition. PI controller is then input the amount of heat during the pressure PR, and the pressure for a given value is generally based on the speed grade pressure calculated. In order to prevent low-pressure bypass overloaded when a large load, and some units have low-pass opening limit. Orderly as a result of its limitations: (1) and then heat the steam pressure is high or low pressure bypass steam flow No. 6 Tao et al: Power Plant Steam Turbine Bypass Control System and Implementation of regulation and protection principle 53 large (2) Condenser low vacuum (3) low-pass exhaust pressure is high (4) by circulating warm water or insufficient water pressure in Figure 3 is a diagram of the bypass pressure regulating system. Pang system pressure limit value by the K2 is based on the speed grade pressure pl and paper bypass opening pressure and change of yl. With the first channel integrator closed-loop transfer function is: w = (1/TS) / (1 + (1 /)) = 1 / (1 + TS), its purpose is to set the speed level pressure signal filtering to smooth transient signals, the input signal is P1 + Y1. Where s1 is the lower pressure value. The tough start pressure. The system formed by the pressure of a given value curve, see Kids in 4-liter unit load in the process of increasing pressure for a given range of values than the actual pressure, up to a certain extent, the actual pressure is not on the rise,ugg boots uk, so the given value will be greatly than the measured value, so low pressure bypass valve to shut down. Limited opening of the system took only a reheat steam pressure signal, Figure 3 K6 (ie the lower limit.) When the actual pressure is equal to a given value, the valve opening is Ym, its pressure limits should meet the following relationship between Taiwan: (Pr + K6) * K7 + Ym> K8 the body> (K8 - Ym) / K7 + K6 BIA is open to a certain valve opening (Ym), and then to heat steam pressure after the valve body r values will be restricted opening off small. 2.3 high speed protection of high-pressure bypass valve bypass action for the regulation, the only constant velocity motion can be, and must be fast for the protection of the properties. High pass protection is to prevent the boiler overpressure, or while soaring to over-pressure but the pressure to produce a protective action when excessive. Its operating conditions are generally t (1) boiler over pressure (actual pressure exceeds the limit value) (2) Boiler boost too fast (the actual rate of change of pressure exceeds a given value) (3) to prevent overpressure (suddenly get rid of some or all of the load) (4) Manual quick opening of its logic shown in Figure 5. In which the main steam pressure Pm, Pn is the nominal stress, s dead body to the pressure for a given value of the action value is higher than the nominal or reference value Ⅳ is the power variation, kh is a constant 3 load variable speed low-voltage protection of low-pass There are two movements bypass protection, one quick protection, and second, fast off protection. Bypass protection quick low pressure bypass line with the action and set up quick, and it is sometimes to prevent over-pressure reheat steam designed. Its action are: (1) bypass system work in automatic mode (2) the valve is turned off (3) deviation of reheater pressure is too large or high body r bypass protection of low-pass linkage. The logic shown in Figure 6, low-pressure bypass protection quick off the main set for the protection of condenser, the following conditions occur in the low-pressure bypass to quickly shut down. The logic shown in Figure 7. (1) Condenser (2) Condenser water high (3) high pressure bypass 4 Conclusion bypass outlet temperature control system equipped with the turbo model must match the operating mode to meet the boiler firing ,moncler jackets, temperature,timberland portugal, boost and cooling requirements of the reheater, turn red and start to meet the turbine with load requirements to meet the limit of the boiler pressure and overpressure protection of condenser, etc., to bypass the system truly play its due role. Author: Chen Well, bud, 19,59 Abundant Life, Bachelor of Engineering,mac makeup wholesale, lecturer, research director of End. Goodness in the unattended substation startling turnaround steam bypass control study completed on the snake. (Harbin, 150080) trench Series: Dong Yanping 9 ? q-trial review
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