SU696169A1 - Power unit regulating system - Google Patents

Description

(54) ENERGY BLOCK REGULATORY SYSTEM

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The invention relates to a power system and can be used in the automation of power units with heat-generating turbines operating at a constant and gliding pressure of fresh steam.

Known are power control systems containing a power regulator connected by its output via a switch of type of operation to the control mechanism, the turbine and to the controller of the boiler 1.

A switch connects the power controller to the controls of the turbine or boiler, depending on the mode of operation of the power unit.

These systems do not solve the problem of providing the sliding pressure regime and are not intended for controlling power units with heat-generating turbines.

A power unit control system is also known, which contains a power regulator connected by its output via a switch of type of operation to a turbine control mechanism and to a boiler regulator, a non-linear sliding pressure setting device connected by its input to a pressure sensor in a regulating stage chamber.

turbine, and the output with the boiler controller, and the heat load controller, connected by its output to the steam pressure controller in the turbine extraction chamber | 2 | .

This system is closest to this technical essence and the achieved result.

The disadvantage of the known system should be considered a reduced amount of adjustment of the parameters of the power unit. So, for example, when changing the setpoint of the setting knob of the heat load regulator, the electric power will deviate from the set value.

The purpose of the invention is to improve the quality of the regulation of power unit parameters.

To achieve this, the steam flow controller in the urbine, the inputs of which are connected to the output of the heat load controller and the pressure sensor in the chamber of the regulating stage, is introduced into the circuit of connecting the output of the power regulator to the switch. turbines.

The drawing shows a block diagram of this system.

To the inputs of the regulator 1 steam flow to the turbine are connected the outputs of the power controller 2, the heat load controller 3 and the pressure sensor 4 in the chamber of the turbine control stage. The output of the regulator 1 is connected via a switch 5 of the type of operation to the turbine control mechanism 6 and the boiler regulator 7. The regulator 7 is connected to the boiler 9 through the regulator 8. The pressure sensor 4 with the nonlinear sliding pressure setting device 10 is connected via the fresh steam pressure regulator 11 to the control mechanism 6 or the regulator 7 input depending on the position of the switch 5. The control mechanism 6 through speed control spool 12 13 and block

14 sum spools are connected to servomotors 15 and 16 of control valves 17 and 18 of high 19 and low 20 turbine cylinders. The output of the regulator 3 through the regulator 2G steam pressure in the selection and block 14 is connected to the servomotors

15 and 16 .. The control system works as follows.

During the primary control of the turbine (position A of switch 5), controller I, having obtained the setpoint on the sum of signals from regulators 2 and 3, acts through control mechanism 6, spool 12 and block 14 on servomotors 15 and 16. Servomotors 15 and 16 move valves 19 and 20, the flow through the turbine varies and becomes equal to the target over time. Due to the change in steam consumption per turbine, the setpoint for controller 11 changes in accordance with the characteristics of nonlinear setting device 10, and controllers 11 and 7 transfer the boiler to a new mode of operation. The vapor pressure behind the boiler is changed, and the regulator 1 returns the control valves 17 of the high-pressure cylinder 19 of the turbine to the initial pressure, and at a constant pressure, the new equilibrium position.

During the primary control of the boiler (position B of the switch 5), the controller 1, having received a new task, acts on the controller 7. The boiler 9 switches to the new mode of operation, as a result of which the vapor pressure behind it changes. Turbine governs

a regulator 11 which, according to the mismatch between the set and actual values of the vapor pressure, moves the turbine control valves. In the sliding pressure zone, the change in the vapor pressure signal in front of the turbine to the regulator 11 is compensated by a change in the reference to it, and the load of the turbine is changed due to the change in pressure and, accordingly, the steam flow to it. The controller 3 maintains a predetermined thermal load by changing the settings of the regulators 1 and 21.

The use of this regulating system improves the quality of regulation of the heat and power unit at nominal and sliding pressure of fresh steam.

Claims (2)

1. USSR author's certificate number 421786, cl. F 01 K 7/24, 1972. 2.Ivanov V.A. and Dr. Some results of tests of the automatic control system of the 300 MW unit, Kashirskaya State District Power Plant with sliding pressure “Lime of the USSR universities, ser,” Energetika, 1976, No. 4, p .. 75-81.