JP2009238028A - Multi-series pressure governor control system - Google Patents

Abstract

A multi-series pressure regulator control system capable of preventing the risk of breakage of each pressure regulator as much as possible in a multiple-series pressure regulator in which the pressure regulators are divided and installed.
A system for controlling a plurality of pressure regulators arranged in a plurality of series, wherein opening detectors 1A, 1B and 1C for detecting the opening of each pressure regulator and the opening of each pressure regulator are set. Pilot pressure regulating valves 5A, 5B, 5C that are adjusted based on the pressure and the secondary pressure, regulators 7A, 7B, 7C that adjust the set pressures of the pilot pressure regulating valves 5A, 5B, 5C, and regulators that are in an operating state And a control means 11 for inputting a signal of an opening detector of the pressure regulator and instructing the regulator to adjust a set pressure of a pilot pressure regulating valve of another pressure regulator based on the input value. Multiple series pressure regulator control system.
[Selection] Figure 1

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, including an opening detector for detecting the opening of each pressure regulator, and each regulator. A pilot pressure regulator that adjusts the opening of the pressure regulator based on the set pressure and the secondary pressure, a regulator that adjusts the set pressure of the pilot pressure regulator, and a signal from the opening detector of the pressure regulator that is in an operating state. And control means for instructing the regulator to adjust the set pressure of the pilot pressure regulating valve of another pressure regulator based on the input value.
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-described (1), the control means sets the pilot pressure regulating valve of another pressure regulator so that the control pressure becomes the same as the set pressure of the pilot pressure regulating valve of the pressure regulator in the operating state. The controller is instructed to adjust the pressure.

(3) Further, in the above-described (1) or (2), the control means may be configured such that the opening of the pressure regulator in operation is the opening of the plurality of other pressure regulators in operation and a predetermined opening. When the above difference occurs, the set pressure of the regulator is adjusted so that the opening of the pressure regulator is the same as the opening of the other plurality of pressure regulators.

(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.

(5) Further, in the above-described one of (1) to (4), a plurality of sequences are a normal sequence that normally operates, and a standby that normally starts and starts operation when the normal sequence stops operating. The control means can switch between the regular sequence and the standby sequence by setting or changing the set pressure.

  In the present invention, an opening detector that detects the opening of each pressure regulator, a pilot pressure regulator that adjusts the opening of each pressure regulator based on a set pressure and a secondary pressure, and setting of the pilot pressure regulator A regulator for adjusting pressure, and a regulator for adjusting the set pressure of a pilot pressure regulating valve of another pressure regulator based on the input value by inputting a signal of an opening detector of a pressure regulator in an operating state. And control means to instruct the system to operate multiple series of pressure regulators while maintaining all of the operating pressure regulators at approximately the same opening degree when the gas flow rate increases or decreases. Thus, the opening of the specific pressure regulator can be prevented from being fully opened, and damage caused by being fully opened can be prevented.

  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 FIG. 1, for devices attached to the A line, A is added to the reference symbol indicating the device, and similarly, for devices attached to the B and C lines, B and C are added to the reference symbol indicating the device, respectively. it's shown.

In the A line of the multi-series pressure regulator control system according to the present embodiment, the pressure regulator body 3A having the opening detector 1A and the opening of the pressure regulator body 3A are detected by the set pressure and the pressure gauge 4. A pilot pressure regulating valve 5A that adjusts based on the secondary pressure P1, a regulator 7A that adjusts the set pressure of the pilot pressure regulating valve 5A, and a shutoff valve 9A 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 inputs the pressure P1 on the secondary side and the opening information of the opening detectors 1A, 1B, 1C installed in each line, and enters each line. A control device 11 that sets or changes the set pressure of the installed regulators 7A, 7B, and 7C, and controls driving of the shut-off valves 9A, 9B, and 9C installed in each line, and transmission and reception of signals with the control device 11 The remote monitoring device 13 is installed so as to be able to.
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 of the present embodiment is a so-called loading type pressure regulator, and when the drive pressure increases, the drive pressure exceeds the shut-off force composed of the secondary side pressure and the combined force of the main spring, and the valve opening increases. It is the type to do.
The pressure regulator body 3 </ b> A is provided with an opening detector 1 </ b> A that detects the opening, and an opening signal of the opening detector 1 </ b> A can be output to the control device 11.

<Pilot pressure regulator>
The pilot pressure regulator 5A adjusts the opening of the pressure regulator main body 3A based on the set pressure and the secondary pressure to adjust the opening of the pressure regulator main body 3A.
When the set pressure is _set to _Pset , for example, the pilot pressure regulating valve 5A autonomously adjusts the drive pressure so that the secondary pressure becomes _Pset . In addition, if the set pressure of the pilot pressure regulating valve is set to a pressure sufficiently lower than the pressure on the secondary side, for example, P _Low , the valve is closed until the secondary pressure becomes P _Low. Closed.
The pressure setting of the pilot pressure regulating valve 5A is generally performed by adjusting the biasing force of a spring, but is not limited to this.

<Regulator>
The adjuster 7A adjusts the set pressure of the pilot pressure regulating valve 5A. This adjustment is performed by outputting a control signal from the control device 11 to the adjuster 7A.
The adjustment method is not particularly limited, but is generally performed by adjusting the urging force of the spring of the pilot pressure regulating valve 5A. In addition, the method of determining the set pressure by adjustment is determined in advance such as P _Low and P _set and is adjusted to these values by the control signal of the control device 11, or the control device 11 is not a predetermined value. There is a method of adjusting to an arbitrary value instructed by a control signal transmitted based on the opening detector 1A.

<Shutoff valve>
The shut-off valve 9A closes the A-line flow path based on the control signal of the control device 11 when an abnormality occurs in the pressure regulator provided in the A-line.

<Control device>
The control device 11 inputs the pressure P1 on the secondary side and the opening information of the opening detectors 1A, 1B, 1C installed in each line, and the controller 7A, 7B, 7C installed in each line. The set pressure is adjusted, and the drive control of the shut-off valves 9A, 9B, 9C installed in each line is performed.
Various methods can be considered for adjusting the set pressure of the adjusters 7A, 7B, and 7C.
(1) When the opening of the pressure regulator exceeds the preset opening by the opening signal of the opening detector of the pressure regulator installed in a certain line, the regulator installed in another line A method of setting the set pressure from the non-operating pressure P _Low to the operating pressure P _set .
More specifically, when the opening of the pressure regulator in the A line exceeds the preset opening by the opening signal of the opening detector 1A of the pressure regulator installed in the A line, the installation is performed in the B line. The set pressure of the adjusted controller 7B is set from the non-operating pressure P _Low to the operating pressure P _set .

(2) Setting of the regulator installed in another line when the opening of the pressure regulator exceeds the preset opening by the opening signal of the pressure detector installed in a certain line The pressure is gradually increased from the non-operating pressure P _Low , and the opening signals of the pressure _regulators of the line and the other lines, which are in the process of being increased, are input, and the pressure regulators of both lines become approximately the same. How to set up.
More specifically, when the opening of the pressure regulator in the A line exceeds the preset opening by the opening signal of the opening detector 1A of the pressure regulator installed in the A line, the installation is performed in the B line. The set pressure of the adjusted regulator 7B is gradually increased from the non-operating pressure P _Low , and in the process of increasing the pressure signal of the A line and B line pressure regulators, the pressure regulators of both lines are opened. The degree is set to be approximately the same.

<Remote monitoring device>
The remote monitoring device 13 is installed so as to be able to send and receive signals to and from the control device 11, and is usually arranged at a remote location away from the governor station where the pressure regulator is installed. Information such as the opening signal of the pressure regulator installed in each line and the set pressure is received from the control device 11, and the control device 11 sets and adjusts 7A, 7B, and 7C installed in each line. And an instruction for controlling the shut-off valve 9 can be made.

<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) may be operated. In this case, the A line is _set so that the downstream pressure becomes P _set. The pilot pressure regulating valve 5A is set. The pressure regulators for the B line and the C line are _set so as not to operate by setting the set pressure of the pilot pressure regulating valves 5B and 5C to a pressure P _Low sufficiently lower than P _set .
The pilot pressure regulating valves 5A, 5B, and 5C of each line may be directly set manually by the pilot pressure regulating valves 5A, 5B, and 5C, or the regulators 7A, 7B, and 7C by signal input to the control device 11. May be set by outputting a signal, or may be set by inputting to the remote monitoring device 13 and transmitting the signal to the control device 11.

When set as described above, the A-line pilot pressure regulating valve 5A operates by autonomously adjusting the drive pressure so that the secondary pressure P1 becomes P _set, and only the A-line pressure regulator valve opens. , B, C line pressure regulator valves remain closed, and one pressure regulator is operated (S1).
When the gas flow rate increases, the driving pressure from the pilot pressure regulating valve 5A increases and the opening of the pressure regulator gradually increases.
The control device 11 determines whether or not the opening of the pressure regulator has reached a predetermined opening (X _max ) (S2), and determines that it has reached the opening (X _max ) A signal for changing the set pressure of the pilot pressure regulating valve 5B to P _set is output to the regulator 7B of the B line, for example, the B line. The regulator 7B receives this signal and changes the set pressure of the pilot pressure regulating valve 5B from P _Low to P _set (S3). As a result, the opening of the pressure regulator for the B line gradually increases, and the gas also flows to the B line. As a result, the opening of the pressure regulator for the A line gradually decreases. It becomes a stand-alone operation.

Furthermore, when the gas flow rate increases, the opening of the pressure regulators in the A and B lines gradually increases. Then, the control device 11 determines whether any opening of the pressure regulator has reached a predetermined maximum opening (X _max ) (S5), and any opening of the pressure regulator is the opening ( when it is determined to have reached the X _max) is the set pressure of the pilot integer valve 5C outputs a signal for changing the P _{the set} against adjuster 7C of C line. The controller 7C receives this signal and changes the set pressure of the pilot pressure regulating valve 5C from P _Low to P _set (S6). As a result, the opening of the pressure regulator in the C line gradually increases, and the gas also flows into the C line, thereby gradually reducing the opening of the pressure regulator in the A and B lines. Three pressure regulators are operated.

If it is determined in S5 that neither opening of the two pressure regulators has reached the opening ( _Xmax ), the control device 11 sets any opening of the pressure regulator in advance. It is determined whether the opening is less than the minimum opening (X _min ) (S8). If the opening of any pressure regulator exceeds the minimum opening (X _min ) (in the case of NO determination), A The operation of two pressure regulators in the B line is continued (S4). In the determination of (S8), when it is determined that any opening of the pressure regulator is equal to or less than the minimum opening ( _Xmin ), the set pressure of the regulator 7B of the pressure regulator of the B line is set to P _Low . It changes (S9), and it sets it as one unit operation of A line again (S1).

During the operation of the three units (S7), the control device 11 determines whether the opening of any of the three pressure regulators is equal to or less than the preset minimum opening ( _Xmin ) (S11). When the opening of the pressure regulator also exceeds the minimum opening (X _min ) (in the case of NO determination), the three pressure regulators are continuously operated (S7). In the determination of (S11), when it is determined that any opening of the pressure regulator is equal to or less than the minimum opening ( _Xmin ), the set pressure of the regulator 7C of the C line pressure regulator is set to P _Low . It changes (S12), and it sets it as 2 unit operation of A and B line again (S4).

In the present embodiment, since it is assumed that the maximum number of the three units is operated, any one of the pressure regulators during the three unit operation of (S7) has a predetermined maximum opening (X _max There is no operation for determining whether or not it has reached (4), but if four or more units are assumed to be 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 regulators are configured so that all the opening amounts of the operated pressure regulators are substantially the same. It is possible to operate while maintaining a certain degree, and it is possible to prevent the opening of a specific pressure regulator 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 opening degree information and pressure information input to the control device 11 has been described. However, an instruction signal can be input from the remote monitoring device 13 to the control device. Based on this, the control of the pressure regulator in each line may be supplementarily performed.

  In addition, when the opening of the pressure regulator of a certain line differs from the opening of the pressure regulator of another line by a certain cause during operation in a plurality of series, a difference occurs. The opening of the pressure regulator may be automatically adjusted by outputting a set pressure adjustment signal from the control device 11 to the adjuster to adjust the set pressure.

In addition, when operating multiple pressure regulators, as described above, each regulator is finely adjusted so that the openings of all the pressure regulators are substantially the same. If it is not possible to adjust the opening of the pressure regulator to be almost the same even after adjustment, or if the value of the regulator is significantly different compared to the relationship between P _set and the regulator measured (set) in advance, The pressure regulator may be regarded as abnormal, and the shutoff valve provided upstream of the pressure regulator may be closed.

In the above embodiment, a so-called loading type pressure regulator has been described. However, the present invention is not limited to this, and a so-called unloading type pressure regulator can be similarly applied. 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. 3 shows the configuration of an embodiment to which the present invention is applied in the case of the unloading type. 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 other aspect of the multiple series pressure regulator control system which concerns on one embodiment of this invention.

Explanation of symbols

1A, 1B, 1C Opening detector 3A, 3B, 3C Pressure regulator body 5A, 5B, 5C Pilot pressure regulator 7A, 7B, 7C Regulator 9A, 9B, 9C Shut-off valve 11 Control device 13 Remote monitoring device

Claims (5)

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 opening of each pressure regulator based on a set pressure and a secondary pressure A pilot pressure regulating valve to be adjusted, a regulator for adjusting a set pressure of the pilot pressure regulating valve, and a signal of an opening detector of the pressure regulator in an operating state are inputted, and pilots of other pressure regulators are inputted based on the input values. And a controller for instructing the regulator to adjust a set pressure of the pressure regulator. The control means instructs the regulator to adjust the set pressure of the pilot pressure regulating valve of another pressure regulator so that the set pressure is the same as the set pressure of the pilot pressure regulating valve of the pressure regulator in the operating state. The multiple-sequence pressure regulator control system according to claim 1. When the opening of the operating pressure regulator is different from the opening of the other operating pressure regulators by a predetermined opening or more, the control means sets the opening of the pressure regulator to the other plurality. The multi-series pressure regulator control system according to claim 1 or 2, wherein the set pressure of the regulator is adjusted to be equal to the opening of the pressure regulator. 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. The multiple series includes a normal series that operates normally and a standby series that normally waits and starts operation when the regular series stops operating, and the control means switches between the regular series and the standby series by setting or changing the set pressure. The multiple-sequence pressure regulator control system according to any one of claims 1 to 4, wherein the multiple-sequence pressure regulator control system can be used.

Images