SU1112131A1 - Method for controlling turbine with steam offtake - Google Patents

Abstract

TURBINE REGULATION METHOD WITH STEAM VENTING by controlling the movement of valve servomotors of a part of a high and a part of a low pressure turbine according to signals from the speed regulators and the pressure of the pump in the selection and forming a corrective influence on the change in the setpoint of the pressure regulator according to the results of measuring the vapor pressure in the pump and the consumption of steam from the selection , characterized in that it additionally measures the consumption of fresh steam and controls the value of a given electric power, determines the maximum and minimum possible the values of electrical power but the measured consumption of fresh steam and steam from the selection and the vapor pressure in the selection compare the value of the specified electrical MONTENA with the range between these possible values and the formation of a corrective effect on the change in the setpoint of the pressure regulator is based on the result of this comparison, i additionally also but this result has an effect on the timelessness of the servomotor kla (Ls of the low pressure part). go so

Description

The invention relates to a power system and can be used to automate the control of turbines with the selection of iar. A known method of adjusting a turbine with steam extraction by controlling the change of the servomotor iciananoB part of the high and part of the low pressure turbine to the signals of the speed controllers and the steam pressure in the selection and forming a corrective effect on the change in the setpoint of the pressure regulator according to the results of measuring the steam pressure in the selection and steam consumption from selection (certificate of authorship To 877088, cl. F 01 D 17/20, 1980). According to the present invention, in the method of adjusting a turbine with steam extraction by controlling the movement of clan servo motors of a part of a high and a part of a low pressure turbine by signals from speed and pressure pei-selectors of the steam in the selection and () forming a corrective influence on the pressure change according to the measurement results the pressure of the nara in the selection and the steam consumption from the selection additionally measure the flow of fresh steam and control the value of a given electric power, determine the maximum and minimum Possible values: 1 electrical power measured 1) 1 m of fresh steam and steam from the selection and the pressure of the nara in the selection, compare the value of a given electric monoton with the interval between these possible values and the formation of a corrective effect on the change in the pressure regulator setting is based on the result of this comparison , additionally shaping also this result, the effect on the movement of the valve servomotor of the low pressure part; 1. On (}) Figure 1 shows the activation circuit for servomotors, regulators, and sensors for implementing this method of adjusting a turbium with steam extraction; in fig. 2 is a diagram of the formation of effects on the change in the setpoint of the pressure regulator and the change in valve servomotor of the low pressure part. A turbine with a high-pressure part 1; 1 and a low-pressure part 2 has a bottom 3 selection after the high pressure part 1. The servomotor 4 is connected to valves 5 which control the supply of fresh bunk to the high pressure part 1. The servo motor 6 is connected to valves 7, which control the steam supply to the low pressure part 2 of the turbine. The speed controller 8 and the pei-stor 9 steam pressure in the selection are connected to the inputs of servomotors 4 and 6. Sensors 10 and 11 measure positively of servomotors 4 and 6, respectively, and sensors 12 measure the vapor pressure in selection 3. The formation circuit contains a block 13 amplification, block 14 limitation, functional / 1Y1e converters 15-18 and electrical | 1 handheld controller 19. A control signal is received from the central regulator to the input (1 of the converter converter 15; | 20 for a given electrical power, which is); take into account the deviation of the network frequency. The functional converter 15 limits and normalizes the signal 20, its output} th signal 2 is fed to the block 14 g) of the grading. Pa ihod | 1 functional nreobrav: yuvateli 16 and 17 signals are received 22, 23 and 24, respectively, on the steam consumption from the selection (for example, by the position of the servomotor 6), the fresh steam consumption (for example, by the output of the servo motor 4) and the pressure, 1ppi pair in selection (from sensor 12). Functional converters 16 and 17 on the basis of .uiHipaMMbi modes of operation of the turbine with og) o) ohm and signals 22, 23 and 24 o; 1 average; | k) t is the maximum possible value of 25 electrical power and its minimum possible value 26, which are entered in block 14 as upper and lower limits. Depending on the correlation between the magnitudes of the signal 21 and the values 25 and 26, the output signal 27 of block 14 is equal to si | -nale 21 at its input or one of the limit values 25 or 26. The amplification unit 13 acts on an ectrohydroelectric converter 19 which forms the effect of 28 on the movement of the servomotor 6 K.iariaintB 7 of part 2 By block 1, block L in ({functional conversion, 1E 18 determines the change in the consumption of fresh steam, equivalent to the change in electrical power — task b, 14) and 13, and but this} changes the correct displacement of 29 changing the setpoint of the regulator 9. The way of implementation is one of the following. Moving the servo motor 6, caused 11 10e impact by 28, which takes into account the given power, 1 electric power) and its max. ia, ibHoe and minima, 1 possible value, leads to altered.) the position of the clans 7. In the result of the NPA unchanged During part I of steam in a high press: -p1 n izmenenpi steam flow into the selection nerestano1 ki K.iaiianoB 7 varies mslpnost turbine. Since the change in steam flow rate through part 2 is low1 () of pressure 1bina n) at a constant flow rate of fresh steam, 1news: the effect of the pressure regulator 9 on pp, withdrawing pei, iH; nionuie K .ianafibi 5 II 7, it is necessary in eihhs / juv xn) ed1lnraIlj 11 it is vol. action. , D, 1I of this KopjieKniryuyheye impact

changes the rate of the regulator 9.

Thereby, the change in 1-year-old my-one-year-old turuny is: about DKDJV.IM a pair in accordance with a task 11I1 1m of its value while maintaining a constant flow rate C1 el e | on n; a new1) 1H1aet e (| 1facttrn | | part ponni.i. h4.:, Ik jXi-.aHHH operating mode

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Claims (1)

METHOD FOR REGULATING A TURBINE WITH STEAM SELECTION by controlling the movement of the valve servomotors of the high and low pressure parts of the turbine according to the signals of the speed and steam pressure regulators in the selection and the formation of the corrective effect on the change in the set point of the pressure regulator according to the results of measuring the steam pressure in the selection and the steam consumption from the selection , characterized in that it additionally measure the flow rate of fresh steam and control the value of a given electrical power, determine the maximum and minimum possible values electric power according to the measured flow rates of fresh steam and steam from the selection and steam pressure in the selection, compare the value of the specified electrical power with the range between these possible values and the formation of the corrective effect on the change in the setpoint of the pressure regulator is carried out according to the result of this comparison, in addition _to forming also this the result is the effect on the movement of the servomotor valves of the low pressure part. SU „„ 1112131 I I I 2 1.3 I