SU1581965A1 - Method of determining the reserve of thermal and hydraulic stability in steam generation circuit - Google Patents

Abstract

The invention improves the accuracy of determining the thermal-hydraulic stability margin in the steam generating circuit by measuring the heat carrier temperature noise before entering the economizer zone of the controlled steam generating channel, using it as an additional mode parameter (except for the coolant flow rate and pressure drop across the channel) to determine the frequency transfer function, calculate its real part when the imaginary is zero, and using the latter as a parameter, rizuyuschego supply thermal-hydraulic stability. 1 il.

Description

(21) 4317062 / 24-06

(22) 10/19/87

(46) 07/30/90. Bul Number 28

(71) Odessa Polytechnic Institute

(72) V.A. Gerliga, A.Yu.Logosov and V.T.Rogovsky

(53) 621.182.26 (088.8)

(56) USSR Copyright Certificate No. 1236247, cl. F 22 V 35/18, 1986. (5.4) METHOD FOR DETERMINING THE STOCK OF THERMAL AND HYDRAULIC STABILITY

IN STEAM GENERATING CIRCUIT

(57) The invention makes it possible to increase the accuracy of determining the thermal-hydraulic stability margin in the steam generating circuit by measuring the heat carrier temperature noise before entering the economizer zone of the controlled steam generating channel, using it as an additional mode parameter (except for the coolant flow rate and pressure drop across the channel to determine the frequency transfer function, calculating its real part when the imaginary is zero, and using the latter as a parameter, x characterizes stock teplogidrav--hydraulic stability. 1 yl.

The invention relates to energy and is intended for use in heat and power plants for various purposes.

The purpose of the invention is to improve accuracy.

The drawing shows a diagram of the device for implementing the proposed method.

The device contains primary transducers 1-3. According to the flow rate differential pressure on the channel and the temperature to enter the economizer zone, respectively, connected to the inputs of blocks 5-7 of the variable component. The output of block 5 is connected to the input of block 8 of auto-spectral analysis (ASA). The output of block 7 is connected to the input of block 9 ACA, the second input of block 10 of mutual spectral analysis (BCA), to the second input of which the output of block 5 is connected, to the first input of block 11 BCA and to the second input of block 12 BCA. The output of the block is connected to the first input of block 13 BCA and to the first input of block 12 BCA, and to the second input of block 13 the output of block 5 is connected.

The first and second inputs of multiplication unit 14 are connected respectively to the outputs of blocks 13 and 9. The output of unit 1I is connected to the second input of multiplication unit 15, and the output of unit 12 is connected to the first input of the last unit 12. The first input of multiplication unit 16 is connected to input of multiplication unit 14, its second input is connected to the output of block 8. The output of block 11 is also connected to the first input of block 17, and the output of block 10 is connected to the second input of block 17, to the first and second inputs of block 18 subtracting if

so se

SP

The outputs of blocks 14 and 15, respectively. The outputs of blocks 16 and 17 are connected to the first and second inputs of subtraction unit 19. The outputs of blocks 18 and 19 are connected respectively to the first and second inputs of division unit 20, the output of which is connected to registration and analysis blocks 21.

The device works as follows.

The measured current values of the parameters of the parameters from the outputs of the primary converters 1, 2 and 3 in the form of electrical signals are fed to the inputs of side 5, 6 and 7, which carry out the selection of the variable (noise) component of the input signals. From the outputs of blocks 5, 6 and 7, the signals arrive at the inputs of the corresponding blocks of spectral analysis, connected according to the block diagram. In blocks 8-13, the I-c, S, 5 spectra are respectively determined.

si l

S

GS

The values of the indicated spectra in the form of electrical signals (for example, binary code sequences or sequences of analog signals) are fed to the inputs of blocks 14-17. In each of these blocks, multiplication operations are implemented, the results of which are fed as electrical signals to the inputs of the dividing unit 20. In block 20, the operation of dividing the signal received at the first input by the signal received at the second input is implemented. Since you

five

the course of block 20, a sequence of electrical signals representing the values of the frequency transfer function (imaginary and real parts of the spectra can be subjected to parallel processing in subsequent converters), is fed to the input of the unit 21 for recording and analyzing the hodograph of the received transfer function (its imaginary and real part). According to the value of the real part of the transfer function, if its imaginary part is equal to zero, the stability margin (boundary) is judged.

Claims (1)

Invention Formula ( Method for determining the stock of thermal and hydraulic stability in a steam generating circuit containing parallel steam-generating channels throttled at the inlet with pre-included heat exchangers by measuring the noise of two operating parameters, the flow rate of the heat transfer fluid and the pressure drop across the controlled channel, determining the frequency transfer function , the value of its real part and with equality to zero 0 of the imaginary part, characterized in that, in order to improve accuracy, the noise of the temperature of the coolant is measured before entering the economizer zone of the controlled steam generating channel and is used as the third mode parameter when determining the transfer function. 0 five