SU1236116A2 - Device for automatic starting of turbine - Google Patents

Description

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The invention relates to a power system, can be used to automate the process of starting turbines, and is an improvement of the device according to Aut. No. 1186810,

The purpose of the invention is to increase the efficiency of the start-up process.

Pa drawing shows the block diagram of the proposed device.

The device contains a regulating valve 1 of the turbine 2 connected to the loading controller 3, a sensor 4 of the temperature of the metal of the turbine 2 connected to the analog computing unit 5. The pulse generator 6 is connected to the analog computing unit 5 and through the counting unit 7 to the buffer register 8 equipped with control input 9 and information input 10 and connected to the controller 3 external. The integrator 11 of the control action, equipped with the control input 12 and information input 13, is connected to the controller 3 and through the register 1 4 shifts - with information input 15 of switching unit 16. The first division block 17 is connected by information input 18 to a block (16, information input 19 to the integrator 2.0 of the parameter being monitored, and output to information input 21 of the second division block 22, which is connected by information input 23 to the setting 24 of the coefficient factors and output - with the first scaling unit 25, also connected to the analog computing unit 5 and to the buffer register 8. The differentiating unit 26 is connected to the control inputs 27 and 28 of the blocks 16 and G /. The sensor 4 is connected to the information input 29 of the integrator 20 to block 26. The counting unit 7 is connected to the control input 12 of the integrator 11, the control input 30 of the block 16 and the control input 31 of the integrator 20. The second scaling block 32 is equipped with a group of 33 inputs, an input 34 and an input 35. Group 33 of the inputs of the block 32 connected to the input 36 of the device. The inputs 34 and 35 of the block 32 are connected respectively to the sensor 4 and the setter 24. The output of the block 32 is connected to the information input 37 of the prohibition block 38, the control input 39 of which is connected to the differentiating block 26, and the output to the input 40 regulator 3 loading, input 41 of which is connected nen with register 8.

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The device works as follows.

In the initial start-up period, the temperature of the metal of the turbine 2, measured

sensor 4, unchanged. The duration of this period is determined by the inertia of the heating of the turbine and the external conditions of this start-up (for example, ambient temperature, cooling water temperature, energy carrier parameters, etc.). In this case, a zero signal is generated at the output of differentiating unit 26, which prohibits the operation of blocks 16 and 17, and integrator 11 calculates the integral values of the control action generated by controller 3. These values have a frequency equal to the constant integration of the control actions The determined frequency of the generator 6 and the conversion factor of the block 7 are recorded in the shift register 14.

At the same time, the zero signal of the differentiating unit 26, which is permissive for the prohibition unit 38, is fed to the control input 39 of the unit 38. At the same time, the signal corresponding to

the correction factor and the initial start-up phase, formed by the second scaling unit 32 and arriving at the information input 37 of the block 38, passes to the input 40 of the controller 3, which generates the control signals of the start rate. Block 32 generates a correction factor signal as the ratio of the numerical values of the starting conditions (for example, the cooling temperature

medium, cooling water temperature, energy carrier parameters, etc.), at which the starting characteristic of the turbine is determined, which is specified by the controller 3,

input 35 of block 32, and the actual values of the same parameters measured by sensors connected to group 33 of inputs of block 32 from input 36 of this device. The initial start-up phase corresponding to the state of the turbine at the start of start-up is determined by block 32 as the difference between the temperature values of the metal of the turbine arriving at input 34 of unit 32, and the ambient temperature measured by a sensor connected to one of the inputs of group 33 of block 32 .

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Thus, the values of the control actions generated by the regulator .3, in the initial start-up period, are corrected by block 32 through block 38 in accordance with the external conditions in which the turbine starts up, and its prestarting condition.

When the initial temperature of the metal of the turbine 2, measured by the sensor 4, changes, the signal at the output of the block 26 becomes non-zero, allowing the blocks 16 and 17 and the locking block 38 to work. In accordance with the number of control steps counted by block 16 by the start of the change in metal temperature turbine 2 and determining the actual time lag of the temperature of the metal of the turbine 2 relative to the control action, block 16 connects to the information input of the first dividing unit 17 the corresponding bits of the shift register 14, which The numerical integral value of the control action that caused the first temperature change of the metal of the turbine 2 is stored. In block 17, the integral value of the control action is divided by the corresponding value of the temperature change generated by the integrator 20. The result of the division (coefficient of start conditions) in the second division 22 is divided the value given by the setting device 24, which characterizes the start conditions under which the relationship between

Editor O. Golovach

Compiled by A. Kalashnikov

Tehred L. Serdyukova Proofreader L. Pilipenko

Order 3074/33 Circulation 500 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

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10 5 0

five

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the temperature of the metal of the turbine 2 measured by the sensor 4 and the 5 thermal stress values calculated by the analog computing unit 5. The result of the calculation in block 22 enters block 25, scaling the thermal stress values calculated by block 5 in accordance with the actual start conditions.

When the turbine 2 is heated, the voltage in the metal changes according to a complex law depending on the temperature of the metal measured by the sensor 4. Block 5 solves the differential equation describing the relationship between the temperature of the metal and the resulting thermal voltage on a machine time scale. The computer time intervals are set by generator 6 with a frequency determined by the conversion factor of block 7, the result of calculation by thermal voltage block 5 is written into the buffer register 8, the output of which is connected to controller 3. In the latter, by the difference of the specified maximum allowable value of thermal voltage and the corresponding This start-up step with the calculated value generates a control signal that sets the turbine start-up tempo.

The start-up process and the cycle of operation of the device are completed when the turbine operating parameter reaches a predetermined value fixed by a load sensor (not shown).

Claims (1)

DEVICE 'FOR AUTOMATIC STARTING OF A TURBINE by ed. the fact that, in order to increase the efficiency of the start-up process, it is additionally equipped with a prohibition unit with information and enable inputs and a second scaling unit, the inputs of the latter being connected to the turbine metal temperature sensor and master, the output to the information input of the prohibition unit, the allowing input of which is connected with the output of the differentiating block, and the output of the prohibition block is connected to the input of the regulator No. 1186810, characterized by loading. SU., „1236116 A 2