JP2009301257A - Control system for pressure regulator of multiple line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control system for pressure regulators of multiple lines in which the pressure regulators are divided into multiple lines and installed, the control system preventing the risk of damage to each pressure regulator as much as possible. <P>SOLUTION: This system for controlling the plurality of pressure regulators installed in multiple lines includes: opening degree detectors 1A, 1B and 1C for respectively detecting the opening degrees of corresponding pressure regulator 3A, 3B and 3C; a pilot pressure regulation valve 7 for adjusting the opening degrees of the plurality of pressure regulators 3A, 3B and 3C based on a set pressure and a secondary side pressure; operation valves 11A, 11B and 11C respectively installed in channels reaching from the pilot pressure regulation valve 7 to respective pressure regulator 3A, 3B and 3C for operating the opening/closing of the channel; and a control means 13 for receiving as input, the signal of the opening degree detector of the pressure regulator in an operation state, and for controlling the opening/closing of the operation valve based on the input value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a pressure regulator that is provided in a pipeline system of, for example, city gas, etc., and reduces a primary side fluid pressure to a secondary side fluid pressure to suppress a change in secondary side pressure with respect to a flow rate change. More specifically, the present invention relates to a control system for a plurality of series pressure regulators in which the pressure regulators are divided into a plurality of series.

  In the piping system that supplies city gas, a pressure regulator is installed at a location where the gas pressure is reduced from the primary side, which is the high pressure side, to the secondary side, which is the low pressure side, in order to supply the gas pressure in multiple stages. . Such a pressure regulator is also referred to as a governor, and includes a mechanism that automatically adjusts the opening of the valve so that the pressure fluctuation on the secondary side becomes small even when the gas flow rate fluctuates.

If the flow rate is insufficient with a single pressure regulator, a plurality of pressure regulators are provided, and the downstream pressure setting values of the plurality of pressure regulators are set to the same value so that the plurality of pressure regulators are operated. (For example, refer to Patent Document 1).
JP 2001-141199 A

  Since the pressure regulator is automatically controlled so as to become the set pressure P by the pilot pressure reducing valve, if the normal system of the set pressure P1 is operating, the standby system of the set pressure P2 lower than P1 is stopped. . In addition, if the capacity (flow rate) is insufficient with one pressure regulator, multiple pressure regulators (two or more regular pressure regulators) are provided, and the set pressures of the multiple regular pressure regulators are made the same. It corresponds to the flow rate.

However, it is actually difficult to set the set pressure of multiple pressure regulators to the same pressure, and the set pressure may change over time, resulting in a difference in the opening of multiple pressure regulators. It is also conceivable that a specific pressure regulator is fully opened.
In the fully opened state, the valve body is in a state farthest from the valve seat, and this state is performed by mechanically restraining the valve body by a stopper. For this reason, if the valve body is fully opened frequently or rapidly, the valve body may be damaged by colliding with the stopper. For this reason, in general, when selecting a pressure regulator, it is recommended that the opening at the selected flow rate be about 80%, and the current situation is to use a pressure regulator with a large capacity.

  The present invention has been made to solve such a problem, and in a multi-series regulator that installs pressure regulators in a plurality of series, the multi-series regulator can prevent the risk of breakage of each pressure regulator as much as possible. It aims to provide a pressure control system.

(1) A multiple series pressure regulator control system according to the present invention is a system for controlling a plurality of pressure regulators arranged in a plurality of series, the opening detector detecting the opening of each pressure regulator, and the plurality of pressure regulators A pilot pressure regulating valve that adjusts the opening of the pressure regulator based on the set pressure and the secondary pressure, and each flow path that is provided in each flow path that introduces drive pressure from the pilot pressure regulating valve to each pressure regulator. And a control means for inputting a signal of an opening detector of the pressure regulator in an operating state and performing opening / closing control of the operation valve based on the input value. Is.
Note that “adjustment” when adjusting the set pressure of the pilot pressure regulating valve is a concept including setting and changing.

(2) Further, in the above (1), the controller further includes an adjuster that adjusts the set pressure of the pilot pressure regulating valve, and the adjuster adjusts the set pressure of the pilot pressure regulating valve by a control signal of the control means. It is characterized by this.

(3) Further, in the above (1) or (2), a plurality of pilot pressure regulating valves are provided, and any one of the plurality of pilot pressure regulating valves can be selected by the control means. Is.

(4) In addition, in the device according to any one of the above (1) to (3), remote monitoring that acquires information on the opening detector input to the control means and monitors the operating state of each pressure regulator A device is provided.

  In the present invention, an opening detector that detects the opening of each pressure regulator, a pilot pressure regulator that adjusts the openings of the plurality of pressure regulators based on the set pressure and the secondary pressure, and the pilot pressure regulator A signal is input to the input value by inputting a signal from an operation valve provided in each flow path for introducing a driving pressure to each pressure regulator and opening and closing the flow path, and an opening detector of the pressure regulator in an activated state. And control means for performing opening / closing control of the operation valve based on the plurality of series of pressure regulators, when the gas flow rate is increased or decreased, the operating pressure regulators are all opened at substantially the same opening degree. It becomes possible to operate while maintaining, and the opening of a specific pressure regulator can be prevented from being fully opened, and damage caused by being fully opened can be prevented.

[Embodiment 1]
FIG. 1 is an explanatory diagram of a multi-series pressure regulator control system according to an embodiment of the present invention. The multiple series pressure regulation control system according to the present embodiment is a system that controls a plurality of pressure regulators arranged in a plurality of series, and the number of series is not particularly limited, but in FIG. 1, three series (A, B , C line). In addition, in FIG. 1, about the apparatus attached to A line and the apparatus related to the apparatus attached to A line, it attaches and shows the code | symbol which shows this, and similarly about the apparatus attached to B, C line, etc. These symbols are indicated by adding B and C, respectively.

The A line of the multi-series pressure regulator control system according to the present embodiment includes a pressure regulator body 3A having an opening detector 1A and a shutoff valve 5A that shuts off the flow of gas to the A line. Yes.
As for the B line and the C line, as shown in FIG. 1, the same devices as those installed on the A line are installed.
In addition, the multi-series pressure regulator control system according to the present embodiment is configured so that the opening of the pressure regulator main body portions 3A, 3B, and 3C is based on the set pressure and the secondary pressure P1 detected by the pressure gauge 4. The pilot pressure regulating valve 7 to be adjusted, the flow paths 9A, 9B, 9C for introducing the driving pressure from the pilot pressure regulating valve 7 to the pressure regulator main body portions 3A, 3B, 3C, and the flow paths 9A, 9B, 9C, respectively Operation valves 11A, 11B, and 11C that are provided to open and close the flow paths 9A, 9B, and 9C are provided.
Moreover, the pressure P1 on the secondary side and the opening information of the opening detectors 1A, 1B, 1C installed in each line are inputted, and the opening / closing of the operation valves 11A, 11B, 11C installed in each line is controlled. And a remote monitoring device 15 installed so that signals can be transmitted to and received from the control device 13.
Hereinafter, the configuration of each device will be described in more detail. In addition, since the apparatus installed in each line has the same function, in the following description, the apparatus installed in the A line will be described as an example.

<Pressure regulator body>
The pressure regulator body 3A according to the present embodiment is a so-called loading type pressure regulator. When the drive pressure increases, the drive pressure exceeds the cutoff force composed of the combined pressure of the secondary side pressure and the main spring, and the valve opens. It is of a type that increases in degree.
The pressure regulator main body 3A is provided with an opening detector 1A that detects the opening, and an opening signal of the opening detector 1A can be output to the control device 13.

<Pilot pressure regulator>
The pilot pressure regulating valve 7 adjusts the driving pressure based on the set pressure and the secondary pressure to adjust the opening of the pressure regulator main body 3A, 3B, 3C, and thereby the opening of the pressure regulator main body 3A, 3B, 3C. To be adjusted.
When the set pressure is _set to P _set , for example, the pilot pressure regulating valve 7 autonomously adjusts the drive pressure so that the secondary pressure becomes P _set .
The pressure setting of the pilot pressure regulating valve 7 is generally performed by adjusting the urging force of a spring, but is not limited to this.
A primary pressure is introduced into the pilot pressure regulating valve 7, and an opening / closing valve 16 is provided in the introduction flow path.

<Shutoff valve>
The shutoff valve 5 </ b> A closes the flow path of the A line based on the control signal of the control device 13 when an abnormality occurs in the pressure regulator provided in the A line.

<Control device>
The control device 13 inputs the pressure P1 on the secondary side and the opening information of the opening detectors 1A, 1B, and 1C installed in each line, and the operation valves installed in the respective flow paths 9A, 9B, and 9C. Controls opening and closing of 11A, 11B, and 11C.
As an open / close control method for the operation valves 11A, 11B, and 11C, for example, the operation valve 11A is initially opened and the operation valves 11B and 11C are closed, and the opening signal of the opening detector 1A is used to adjust the pressure regulator body 3A When the opening degree exceeds a preset opening degree, the operation valve 11B is opened.

<Remote monitoring device>
The remote monitoring device 15 is installed so as to be able to transmit and receive signals to and from the control device 13, and is usually arranged at a remote location away from the governor station where the pressure regulator is installed. The control device 13 receives information such as an opening signal of a pressure regulator installed in each line, a set pressure, and the like so that the control device 13 can control the operation valves 11A, 11B, and 11C. It has become.

<Description of operation>
FIG. 2 is a flowchart for explaining the operation of the multiple series pressure regulator control system according to the present embodiment. The operation of the multiple series pressure regulator control system according to the present embodiment will be described below with reference to FIG.
When the gas flow rate is small, only one of the plural series of pressure regulators (for example, the A-line pressure regulator) needs to be operated. In this case, the pilot pressure regulator 7 is connected to the downstream pressure _Pset . The operation valve 11A is opened and the operation valves 11B and 11C are closed.

When set as described above, the pilot pressure regulating valve 7 operates by autonomously adjusting the driving pressure so that the secondary pressure P1 becomes P _set, and only the valve of the A line pressure regulator main body 3A is opened. The valves of the pressure regulator main body portions 3B and 3C in the B, C lines remain closed, and the single pressure regulator main body portion 3A is operated (S1).
When the gas flow rate increases, the driving pressure from the pilot pressure regulator 7 increases, and the opening of the pressure regulator body 3A gradually increases.
The control device 13 determines whether or not the opening of the pressure regulator has reached a predetermined opening (X _max ) (S2), and when determining that the opening has reached the opening (X _max ) A signal for opening the operation valve 11B of the B line, for example, the B line is output to open the operation valve 11B (S3).
As a result, the pilot pressure regulator 7 and the pressure regulator body 3B communicate with each other via the flow path 9B, and the drive pressure is introduced into the pressure regulator body 3B, so that the opening of the pressure regulator body 3B in the B line gradually increases. Then, the gas also flows into the B line, whereby the opening of the pressure regulator body 3A of the A line gradually decreases, and two pressure regulators of the A and B lines are operated (S4).

Furthermore, when the gas flow rate increases, the opening degree of the pressure regulator main body portions 3A and 3B in the A and B lines gradually increases. And the control apparatus 13 judges whether the opening degree of either of the pressure regulator main-body parts 3A and 3B has reached the predetermined maximum opening degree ( _Xmax ) (S5), and the pressure regulator main-body parts 3A and 3B. When it is determined that any of the opening degrees has reached the opening degree ( _Xmax ), a signal for opening the operation valve 11C of the C line is output, and the operation valve 11C is opened (S6). As a result, the opening of the pressure regulator main body 3C of the C line gradually increases, and the gas also flows to the C line, whereby the opening of the pressure regulators of the A and B lines gradually decreases, and A, B, Three pressure regulators in the C line are operated (S7).

In the determination of S5, when it is determined that the opening degree of any of the two pressure regulator main body parts 3A, 3B has not reached the opening degree (X _max ), the control device 13 controls the pressure regulator main body part 3A, It is determined whether any opening degree of 3B is equal to or less than a preset minimum opening degree ( _Xmin ) (S8), and the opening degree of any pressure regulator main body exceeds the minimum opening degree ( _Xmin ). If it is (NO determination), the two pressure regulators 3A and 3B in the A and B lines are continuously operated (S4). In the determination of (S8), if it is determined that the opening of any of the pressure regulators 3A, 3B is less than or equal to the minimum opening ( _Xmin ) (in the case of YES determination), the operation valve 11B is closed. (S9), the operation of one unit of the A line is again performed (S1).

During the operation of the three units in (S7), the control device 13 determines whether or not the opening degree of any of the three pressure regulator main body parts 3A, 3B, 3C is equal to or less than a preset minimum opening degree ( _Xmin ). If it is determined (S11) and the opening of any pressure regulator main body exceeds the minimum opening ( _Xmin ) (in the case of NO determination), the three pressure regulators are continuously operated (S7). In the determination of (S11), if it is determined that the opening of any of the pressure regulator main body portions 3A, 3B, 3C is less than the minimum opening ( _Xmin ) (in the case of YES determination), the operation valve 11C is closed (S12), and the two units A and B are operated again (S4).

In the present embodiment, since it is premised that the maximum of three units will be operated, the opening of any of the pressure regulator main bodies during the operation of the three units (S7) There is no operation for determining whether or not _Xmax ) has been reached, but if it is assumed that four or more units are operated, a determination similar to (S5) described above is made.

  As described above, according to the multiple-series pressure regulator control system according to the present embodiment, when the gas flow rate is increased or decreased, the multiple-series pressure regulator control system is configured so that all the opening amounts of the operating pressure regulator main body are almost all. It is possible to operate while maintaining the same opening, and it is possible to prevent the opening of a specific pressure regulator main body from being fully opened and to prevent damage due to being fully opened.

In the above description, an example in which three lines A, B, and C are provided has been described, but the number of lines to be provided is not particularly limited in the present invention.
If n lines are provided, the n-1 line may be used as a regular line and the n line may be used as a spare line. When a spare line is provided, it may be fixed which line is used as a spare line, or may be switched between normal use and emergency depending on the driving situation.

  In the above description, an example in which automatic control is performed based on the opening degree information and pressure information input to the control device 13 has been described. However, an instruction signal can be input from the remote monitoring device 15 to the control device. Based on this, the control of the pressure regulator main body of each line may be supplementarily performed.

  In addition, when operating a plurality of pressure regulator body parts, as described above, the opening degree of all the pressure regulator body parts should be almost the same, but the opening degree of the pressure regulator body part is If the opening of a specific pressure regulator main body part is not substantially the same and is different from a predetermined range compared to other pressure regulator main body parts, the pressure regulator main body part is regarded as abnormal. In view of this, the shut-off valve provided upstream of the pressure regulator body may be closed.

The pilot pressure regulating valve 7 may be set directly or manually with respect to the pilot pressure regulating valve 7, or a regulator (not shown) is installed in the pilot pressure regulating valve 7, and a control signal is sent from the control device 13 to the regulator. Alternatively, the set pressure value may be input to the remote monitoring device 15, a signal of the set pressure value is transmitted to the control device 13, and a control signal is transmitted from the control device 13 to the controller. You may set by outputting.
The adjustment method by the adjuster is not particularly limited, but is generally performed by adjusting the urging force of the spring of the pilot pressure regulating valve 7. In addition, as to how to determine the set pressure by adjustment, for example, it may be determined in advance as P _set and adjusted to these values by the control signal of the control device 13.

[Embodiment 2]
FIG. 3 is an explanatory diagram of the multiple series pressure regulator control system according to the second embodiment of the present invention, and the same reference numerals are given to the same parts as those in FIG. The multiple series pressure regulation control system according to the present embodiment has two pilot pressure regulation valves by adding a pilot pressure regulation valve 17 to that shown in the first embodiment.
Specifically, the flow path for introducing the primary pressure is made into two lines, and the pilot selection valves 19 and 21 are provided in the respective flow paths, respectively. The pilot selection valves 19 and 21 open and close each flow path according to a control signal from the control device 13.

  In the present embodiment configured as described above, the pilot selection valve 19 is normally opened and the pilot selection valve 21 is closed so that the pilot pressure regulating valve 7 is used as a regular one and the pilot pressure regulating valve 17 is used as a spare. can do. However, it is possible to achieve normal use and spare leveling by switching the opening and closing of the pilot selection valves 19 and 21 at a predetermined interval by the control signal of the control device 13.

  Further, by setting the set pressures of the two pilot pressure regulating valves 7 and 17 to different values and selecting a pilot pressure regulating valve having a desired set pressure by the pilot selection valves 19 and 21, the downstream pressure can be reduced without using a regulator. The pressure can also be switched.

In the first and second embodiments, the so-called loading type pressure regulator has been described. However, the present invention is not limited to this, and the invention can be similarly applied to a so-called unloading type pressure regulator. . In the case of an unloading type pressure regulator, when the driving pressure increases, the closing force, which is the combined force of the driving pressure and the sleeve tension, exceeds the primary side pressure for opening the sleeve, and the opening degree decreases. The operation is performed.
FIG. 4 shows a configuration of an embodiment to which the present invention is applied in the case of the unloading type, and the same reference numerals are given to the same or corresponding parts as in FIG. The operation and function are the same as those shown in FIG.

It is explanatory drawing of the multiple series pressure regulator control system which concerns on one embodiment of this invention. It is operation | movement explanatory drawing of the multiple row pressure regulator control system shown in FIG. It is explanatory drawing of the multiple series pressure regulator control system which concerns on other embodiment of this invention. It is explanatory drawing of the other aspect of the multiple series pressure regulator control system which concerns on other embodiment shown in FIG.

Explanation of symbols

1A, 1B, 1C Opening detector 3A, 3B, 3C Pressure regulator body 5A, 5B, 5C Shut-off valve 7, 17 Pilot pressure regulating valve 11A, 11B, 11C Operation valve 13 Control device 15 Remote monitoring device

Claims (4)

A system for controlling a plurality of pressure regulators arranged in a plurality of series, an opening detector for detecting the opening of each pressure regulator, and the openings of the plurality of pressure regulators to set pressure and secondary pressure A pilot pressure regulator that adjusts based on the pilot pressure regulator, an operation valve that opens and closes the flow path that is provided in each flow path that introduces drive pressure from the pilot pressure regulator to the pressure regulator, and a pressure regulator that is in an activated state. And a controller for controlling opening and closing of the operation valve based on the input value by inputting a signal of an opening detector. The multi-series pressure regulator according to claim 1, further comprising an adjuster for adjusting a set pressure of the pilot pressure regulator, wherein the regulator adjusts a set pressure of the pilot pressure regulator according to a control signal of a control means. Control system. 3. The multi-series pressure regulator control system according to claim 1, wherein a plurality of pilot pressure regulating valves are provided, and any one of the plurality of pilot pressure regulating valves can be selected by the control means. The remote monitoring apparatus which acquires the information of the opening degree detector currently input into the control means, and monitors the operating state of each pressure regulator, It provided with the any one of Claims 1-3 characterized by the above-mentioned. Multiple series pressure regulator control system.

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