SU1359558A1 - Automatic control system for releasing medium from lighting separator - Google Patents

Abstract

The invention makes it possible to increase the reliability and accuracy of the adjustment. For this purpose, a measuring vessel 4 is connected parallel to the discharge valve 2 via pipelines 3 and 5 to the discharge pipe 1, which is connected to pipe 6 to remove steam from the separator 15. When steam appears in the discharge medium, the level in vessel 4 decreases to determined by the amount of moisture supplied from the discharge pipe 1. A decrease in the level is sensed by the sensor 9, which transmits the appropriate signal to the controller 11 and further to the valve 2. As the moisture content in the discharge medium decreases The level in the vessel 4 also decreases. Depending on the selected humidity, by adjusting the controller, the device automatically maintains the preset level in vessel 4. 1 sludge. f Z pr created a joint venture 00

Description

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The invention relates to a power system and can be used to regulate the discharge of the medium at the outlet of the separator.

The purpose of the invention is to increase the reliability and accuracy of regulation. The drawing shows a block diagram of the system.

The diagram shows the separator discharge pipeline 1, an electrically operated waste valve 2, pipeline 3 to the measuring vessel 4, pipeline 5 from the measuring vessel, balancing pipe 6 for removing steam from the vessel and equalizing the pressure in the measuring vessel and separator, impulse lines 7 and 8, hydrostatic differential pressure sensor 9, electrical connection 10 between sensor 9 and the medium discharge regulator 11, electrical connection 12 between regulator 11 and the control valve electric drive ,. surface 13 of the heating of the evaporator part of the direct-flow steam generator, pipeline 14 for supplying the medium to the separator 15, pipeline 16 for removing the steam from the separator 15 to the steam-heating section 17 of the steam generator, built-in the steam generator path parts.

A measuring vessel A is connected in parallel with the discharge valve 2 to the waste pipeline 1 through pipelines 3 and 5, which is connected to the pipe 16 to discharge steam from the separator 15.

A sensor 9 is connected to the pipeline 6 and the lowest point of the measuring vessel 4 for measuring levels in the vessel 4. Electric connection 10 by sensor 9 is connected to controller 11, which is connected to valve actuator 2 by electric connection 12.

The system works as follows.

In the initial period of kindling, when the parameters of the medium in the boiler path are low and water (without the content of steam) flows from the separator 15 through the pipeline 1, the measuring vessel 4 is completely filled with water. Sensor 9, perceived a column of water in the measuring vessel 4, transmits a signal to the regulator 11 about its overflow. The controller 11 forms a control

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the signal for the valve 2 to fully open. As the heat gap in the furnace grows, the temperature of the medium discharged from the separator 15 begins to increase. There comes a moment when steam appears in the discharge medium. Steam on the mixture enters the measuring vessel 4. However, due to the fact that

0, the specific volume of the medium in the pipeline 3 has increased, its resistance also increases, which leads to a decrease in the weight flow of the medium through it while maintaining the removal of water from the vessel

5 4 through the pipeline 5. The flow of water through the pipeline 5 in this case depends only on the amount of support of the liquid column in the measuring vessel 4, since the effect on the flow is

0 the pressure difference across the valve 2 is compensated for by a corresponding change in the flow rate of the medium through the pipeline 3. Thus, the level in the vessel 4 when it appears in the discharge medium

5, the pair begins to decrease to a value determined by the amount of moisture supplied from the discharge pipe 1. A decrease in level in the measuring vessel is sensed by sensor 9,

0 which transmits the corresponding signal to the controller and further to valve 2. As the moisture content in the discharged medium decreases, the level in the measuring vessel also decreases. Depending on the selected humidity by adjusting the controller, the device automatically maintains the specified level in the measuring vessel, and hence the humidity (overshoot

0 steam through valve 2).

Level control in the measuring vessel of the device is carried out as follows.

When the level decreases in relation to the target value, the regulator 11 generates a control signal for valve 2 and covers it. As a result, the discharge flow rate of the discharge pipe 1 is reduced,

Q, which leads to a decrease in steam consumption in the latter, corresponding to an increase in steam consumption from separator 15 through pipeline 16. As a result, the humidity of the medium in the discharge pipeline increases .... that leads to recovery

level in measuring vessel.

With an increase in the level in the measuring vessel 4 regulator. 1 1, perceive the corresponding signal from

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sensor 9, gives the comavda electric connection to the actuator of the valve 2 to open proportionally to the received signal, which leads to an increase in the flow rate of the medium through the valve 2 and, consequently, the fraction of steam and a decrease in the humidity of the discharge medium and the level in the measuring vessel.

The optimum degree of humidity (and the level in the measuring vessel) is chosen depending on the task set by changing the regulator setting based on the design features of the boiler separator.

Claims (1)

Invention Formula The system of automatic control of discharge of the medium from the ignition 59558 of a separator equipped with a waste pipe and an inline steam generator that contains a motorized control valve on the discharge pipe, a hydrostatic differential pressure sensor and a regulator of medium discharge from the separator, an outlet connected to the electric drive of the regulating valve, and an input to the hydrostatic sensor differential pressure, characterized in that, in order to ensure reliability and accuracy of regulation, 5 it is additionally equipped with a measuring vessel, connected to the pipeline Data to the discharge pipe before and after the control valve and to the separator, as well as to the hydrostatic pressure drop sensor.