KR101162916B1 - Apparatus for controlling positioner of pneumatic control valve and method thereof - Google Patents

Abstract

PURPOSE: An apparatus and a method for controlling a driving part of a pneumatic control valve are provided to successively control a control valve because multiple driving parts are arranged in one valve and are automatically converted whether the driving parts are malfunction or not. CONSTITUTION: An apparatus for controlling a driving part of a pneumatic control valve comprises a first positioner(50), a second positioner(60), a valve control part(20), an input part(40), and a display part(30). The first positioner controls the opening and closing of a valve by a pneumatic method according to control signals. The second positioner is installed in parallel with the first positioned to control the opening and closing of the valve by the pneumatic method according to the control signals. The valve control part feeds back operational status of the first and second positioners so that the control signals can be outputted according to selection of users by mutually converting the first and second positioners if errors are generated. If the errors are generated through self inspection, one of the first and second positioners is selected. Air flow is converted by controlling an air flow conversion device according to the selection.

Description

Control unit for driving part of pneumatic control valve and its method {APPARATUS FOR CONTROLLING POSITIONER OF PNEUMATIC CONTROL VALVE AND METHOD THEREOF}

The present invention relates to a control unit and a method for driving a pneumatic control valve, and more particularly, to continuously control by providing a plurality of driving units in one valve and detecting the abnormality of the driving unit automatically switching the driving unit of the pneumatic control valve The present invention relates to a control unit and a method for controlling a drive unit of a pneumatic control valve to control the valve.

Pneumatic control valves used in power plants are used in major processes such as water supply flow rate, fuel level and drum level control, and play an important role in producing high quality electricity including stable and efficient surface.

The driving unit for driving such a pneumatic control valve is also equipped with a rapid response and accurate control function by introducing an electronic digital method from the mechanical due to the development of advanced technology.

The technology described above refers to the background of the technical field to which the present invention belongs, and does not mean the prior art.

Such a pneumatic control valve is installed in a one-to-one correspondence with the drive unit, and in the event of a failure in the drive unit, the control function of the control valve is lost and propagates to control loss of the main system. There is a problem that decrement (output reduction) occurs.

In the case of power plants, pneumatic control valves are operated to control the drum level for the turbine power, the level of the drum to make steam, the deaerator level to supply water for steam, and the fuel pressure and flow rate to control the fuel pressure and flow rate by output. Because of high efficiency operation and stable operation, if the pneumatic control valve breaks down, the control valve must be replaced even if these main processes do not cause problems. Only replacement is possible.

In addition, the electronic drive unit is made of electronic devices sensitive to high temperature and vibration in a digital manner, causing a failure due to damage caused by high temperature and vibration.

The present invention has been made to improve the above problems, the control unit of the pneumatic control valve is provided with a plurality of driving units in one valve, and by automatically switching to detect the abnormality of the driving unit can be continuously controlled control valve It is an object of the present invention to provide a control unit and a method of driving a pneumatic control valve.

According to an aspect of the present invention, a control unit for a driving unit of a pneumatic control valve may include: a first positioner for pneumatically adjusting an opening degree of a valve according to a control signal; A second positioner installed in parallel with the first positioner to pneumatically adjust the opening degree of the valve according to a control signal; When an error occurs by receiving feedback of the operating conditions of the first positioner and the second positioner, the first positioner and the second positioner are mutually switched to be selectively switched according to the magnitude of the control signal to selectively receive the control signal from the distributed control system of the power plant. It is equipped with a plurality of input ports to output the input control signal, to warn the abnormal state, to output the control signal according to the user's selection, and if one of the first positioner and the second positioner if an error occurs by the self-check and Valve control unit for switching the flow of air by adjusting the air flow switching device according to the selection; An input unit for setting a range of an error detected by the valve control unit and a set value for operation of the valve control unit or arbitrarily selecting any one of the first positioner and the second positioner in the manual mode; And a display unit for displaying an operation state of the valve control unit.

In the present invention, the first positioner and the second positioner are characterized in that the remote type.

In the present invention is installed in parallel with the first transmitter and the first transmitter for adjusting the opening of the valve remotely through the first positioner and further includes a second transmitter for adjusting the opening of the valve remotely through the second positioner. It is characterized by.

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According to another aspect of the present invention, a method of controlling a driving unit of a pneumatic control valve may include: receiving a mode selection state through an input unit; Operating the selected positioner among the first and second positioners when the mode selection is selected as the manual mode and adjusting the airflow switching device according to the selected positioner; Determining an error by detecting an error when the mode selection is selected as an automatic mode; Judging an error, and if it is determined to be an error, switching from one of the first to second positioners to another positioner, adjusting the airflow switching device according to the changed positioner, and outputting an abnormal state; And determining the error and maintaining the positioner in the current state when the error is normal.

In the present invention, the determining of the error may include determining a range of the error set through the input unit.

In the present invention, the error is characterized in that the difference between the control signal input from the power plant distributed control system and the feedback signal fed back from the first to second positioners.

According to the present invention, the driving unit of the pneumatic control valve is provided with a plurality of driving units in one valve and is automatically switched by detecting an abnormality of the driving unit so that the control of the continuous control valve can be made, thereby improving reliability as well as during operation. It is possible to replace the drive unit that has an error, so that it is possible to exclude the occurrence of power failure or output reduction, and to prevent equipment accidents that may occur due to the failure of the drive unit.

In addition, by damaging the high temperature and vibration of the valve by configuring the drive unit to the remote type it is possible to prevent damage to the electronic device.

1 is a block diagram showing a driving unit control apparatus of a pneumatic control valve according to an embodiment of the present invention.
2 is a flowchart illustrating a control method of a driving unit of a pneumatic control valve according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a drive unit control device and method of the pneumatic control valve according to the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a block diagram showing a driving unit control apparatus of a pneumatic control valve according to an embodiment of the present invention.

As shown in FIG. 1, a control unit for a driving unit of a pneumatic control valve according to an exemplary embodiment of the present invention includes a first positioner 50, a second positioner 60, a valve control unit 20, an input unit 40, and a display unit ( 30).

The first positioner 50 pneumatically adjusts the opening degree of the valve 70 according to the control signal and feeds back the actual opening state of the valve 70 as a feedback signal.

The second positioner 60 is installed in parallel with the first positioner 60 to pneumatically adjust the opening degree of the valve 70 according to the control signal, and feeds back the actual opening state of the valve 70 as a feedback signal.

At this time, the first positioner 50 and the second positioner 60 may be configured in a remote type to block the vibration and high temperature of the valve 70.

As such, the first transmitter 55 and the second transmitter 55 and the second transmitter 60 for controlling the opening degree of the valve 70 remotely through the first positioner 50 as the first positioner 50 and the second positioner 60 are configured as the remote type. The second transmitter 65 is installed in parallel with the first transmitter 55 to adjust the opening degree of the valve 70 remotely through the second positioner 60.

The valve control unit 20 feeds back the operating states of the first positioner 50 and the second positioner 60 to switch between the first positioner 50 and the second positioner 60 when an error occurs, thereby controlling distribution of the power plant. It selectively outputs a control signal input from the system 10 and warns of an error.

In addition, the valve control unit 20 outputs a control signal by operating the first positioner 50 or the second positioner 60 according to the user's selection, and when the error occurs by the self-check, the first to second positioners 50. Select one of the (60) and adjust the air flow switching device 80 according to the selection to switch the flow of air.

That is, when an abnormality occurs in the valve control unit 20 through self-inspection, a control signal output from the power plant distributed control system 10 when the positioner set as the main, for example, the first positioner 50 is set as the main, is output. By outputting through the positioner 50, power generation stop or output reduction due to an error of the valve control unit 20 is prevented.

In addition, the valve control unit 20 may include first to second input ports 21 and 22 to receive a control signal from the power plant distributed control system 10.

In the case where the first to second input ports 21 and 22 are provided, the power plant distributed control system by switching between the first and second input ports 21 and 22 according to the magnitude of a control signal input through the first to second input ports 21 and 22. In the case of redundancy in preparation for a failure of the DCS module (not shown) in 10, the corresponding input may be received.

The input unit 40 sets a range of an error detected by the valve control unit 20 and a set value for the operation of the valve control unit 20, or any one of the first positioner 50 and the second positioner 60 in the manual mode. Allow to select arbitrarily.

For example, the difference between the control signal and the feedback signal may be set to 20%, and the first positioner 50 may be set as the main positioner.

The display unit 30 may configure an LCD panel to display an operation state of the valve control unit 20.

For example, the display unit 30 indicates whether the current valve control unit 20 is in a normal operation state or an error occurs and the positioner is switched.The current value or error of the control signal and the feedback signal, and the current operating state and present The selected positioner can be displayed.

According to the control unit of the drive unit of the pneumatic control valve of the present invention, by determining the error according to the driving state of the first positioner 50 and the second positioner 60 for driving the valve 70 power plant distributed control system ( 10) By selectively converting and outputting the control signal inputted from the positioner, even if an error occurs in one positioner, it is switched to another positioner to output the control signal, and the air flow switching device 80 is adjusted according to the positioner selection to adjust the air. By switching the flow of, continuous control of the valve 70 is possible.

2 is a flowchart illustrating a control method of a driving unit of a pneumatic control valve according to an embodiment of the present invention.

As shown in FIG. 2, the method of controlling the driving unit of the pneumatic control valve may first set a range of an error detected by the valve control unit 20 and a set value for the operation of the valve control unit 20 through the input unit 40. .

Thereafter, the mode selection state is input through the input unit 40 (S10).

Then it is determined whether the automatic mode is selected (S12).

That is, when the automatic mode or the manual mode state is input and is selected as the manual mode, it is determined whether one of the first to second positioners 50 and 60 is selected to operate the selected positioner, and the airflow switching device according to the selected positioner. By controlling the 80, the air flow is switched to output the control signal output from the power plant distributed control system 10 to control the valve 70 (S14).

On the other hand, when the automatic mode is selected, a control signal output from the power plant distributed control system 10 and a positioner selected as an initial state, for example, when the first positioner 50 is set, are fed back according to the operating state of the first positioner 50. An error with the feedback signal is detected (S16).

The occurrence of the error is determined by comparing the detected error with a range of the set error (S18).

At this time, if the detected error is within the range of the set error, the positioner in the current state is operated to output a control signal (S20).

However, when the detected error is out of the set error range, the current positioner is switched to another positioner, and the air flow is switched by adjusting the air flow switching device 80 according to the converted positioner (S22). That is, when the first positioner 50 is in operation, the control unit switches to the second positioner 60 and outputs the control signal. When the second positioner 60 is in operation, the control unit switches to the first positioner 50. Outputs

Then, the positioner is switched over due to an error, and an abnormal state is output so that the driver is notified that an error has occurred in the positioner so as to be replaced (S24).

On the other hand, when the valve control unit 20 includes the first to second input ports 21 and 22, the control signal inputted through the first input port 21 is compared to input a value below the set value. If so, switch to the second input port 22 to receive a control signal. On the contrary, when the magnitude of the control signal input through the second input port 22 is less than or equal to the set value, the control signal may be switched to the first input port 21.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

10: Distributed control system of power plant 20: Valve control unit
30: display unit 40: input unit
50: first positioner 55: first transmitter
60: second positioner 65: second transmitter
70: valve 80: air flow switching device

Claims (8)

A first positioner for pneumatically adjusting the opening of the valve according to a control signal;
A second positioner installed in parallel with the first positioner and configured to pneumatically adjust the opening degree of the valve according to a control signal;
In response to an operation state of the first positioner and the second positioner, if an error occurs, the first positioner and the second positioner are switched to each other to selectively receive the control signal from the distributed power plant distributed control system. The first positioner and the plurality of input ports that are mutually switched according to the size outputs the control signal to be input and warns the abnormal state, and outputs the control signal according to the user's selection, if the error occurs by the self-check A valve control unit which selects any one of the second positioners and adjusts an air flow switching device according to the selection to switch air flow;
An input unit for setting a range of an error detected by the valve control unit and a set value for operation of the valve control unit or arbitrarily selecting any one of the first positioner and the second positioner in a manual mode; And
And a display unit for displaying an operation state of the valve control unit.
The apparatus of claim 1, wherein the first positioner and the second positioner are remote types.
3. The method of claim 2, wherein the first transmitter is installed in parallel with the first transmitter for adjusting the opening degree of the valve remotely through the first positioner, and the opening degree of the valve is remotely controlled through the second positioner. Drive unit control device of the pneumatic control valve, characterized in that it further comprises a second transmitter for.
delete delete Receiving a mode selection state through an input unit;
Operating the selected positioner among the first and second positioners when the mode selection is selected as the manual mode and adjusting the airflow switching device according to the selected positioner;
Determining an error by detecting an error when the mode selection is selected as an automatic mode;
Judging the error and if it is determined to be an error, switching from one of the first to second positioners to a different positioner, adjusting an airflow switching device according to the changed positioner, and outputting an abnormal state; And
And determining the error and maintaining a positioner in a current state when the error is normal.
The method of claim 6, wherein the determining of the error comprises determining a range of an error set through the input unit.
7. The method of claim 6, wherein the error is a difference value between a control signal inputted from a power plant distributed control system and a feedback signal fed back from the first to second positioners.

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