JP2006119968A - Duplex automatic switching control device for fluid distribution line - Google Patents

Duplex automatic switching control device for fluid distribution line Download PDF

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JP2006119968A
JP2006119968A JP2004308027A JP2004308027A JP2006119968A JP 2006119968 A JP2006119968 A JP 2006119968A JP 2004308027 A JP2004308027 A JP 2004308027A JP 2004308027 A JP2004308027 A JP 2004308027A JP 2006119968 A JP2006119968 A JP 2006119968A
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valve
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Yuji Gomi
裕司 五味
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IHI Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a duplex automatic switching control device for fluid distribution line capable of automatically switching a regulating valve while minimizing the fluctuation of a control target value, and reducing the cost while avoiding enlargement of its actuator part without extending the range of the regulating valve. <P>SOLUTION: In normal time, the aperture of a main regulating valve 12A is automatically adjusted, in a state where driven cutoff valves 13B and 14B are fully closed and main cutoff valves 13A and 14A are fully opened, so that a flow rate 11 detected by a flowmeter 15 becomes a flow set value 16, while in the event of abnormality of the main regulating valve 12A, the aperture of the main regulating valve at that time 12A is held, the openings of the driven cutoff valves 13B and 14B are changed from full close to full open while gradually throttling the main cutoff valve 13A from full open to full close, and the aperture of a driven regulating valve 12B is automatically adjusted so that the flow rate detected by the flowmeter 15 becomes the flow set value 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、流体流通ラインの二重化自動切換制御装置に関するものである。   The present invention relates to a dual automatic switching control device for a fluid distribution line.

一般に、ボイラや蒸気タービン等を有するプラントにおいては、給水や燃料といった流体の制御対象値としての流量等を制御することはきわめて重要である。   In general, in a plant having a boiler, a steam turbine, and the like, it is extremely important to control the flow rate as a control target value of a fluid such as water supply or fuel.

このため、従来においては、図4に示される如く、プラントに流体を供給する流体供給系をA系とB系の二重化構成とし、これら各系統に調節弁1A,1B、電動弁2A,2B及び手動弁3A,3Bをそれぞれ設け、
プロセスデータが入力され、該プロセスデータから適正な流量に制御すべく調節弁1A,1Bの開度をそれぞれ決定し、その開度信号(電気信号)を電/空変換器5A,5Bで空気信号に変換して調節弁1A,1Bに出力するA系及びB系に共用のコントローラ6を設けると共に、
該コントローラ6より弁開/閉指令が入力され、通常時にはA系の電動弁2A、及びB系の電動弁2Bを全開とする弁操作信号を出力し、A系の調節弁1Aの異常時にはA系の電動弁2Aを全閉とする操作信号を出力する弁オペレーション装置7を設けるようにしたものが存在する。(例えば、特許文献1参照。)
特開平5−341849号公報
For this reason, conventionally, as shown in FIG. 4, the fluid supply system for supplying fluid to the plant has a dual configuration of system A and system B, and control valves 1A, 1B, motor operated valves 2A, 2B and Manual valves 3A and 3B are provided,
Process data is input, the opening degree of the control valves 1A and 1B is determined based on the process data to control the flow rate, and the opening signal (electric signal) is sent to the air signal by the electro / pneumatic converters 5A and 5B. A common controller 6 is provided for the A system and the B system that are converted into the control valves 1A and 1B and
A valve opening / closing command is input from the controller 6, and during normal operation, a valve operation signal for fully opening the A-system electric valve 2A and the B-system electric valve 2B is output. When the A-system control valve 1A is abnormal, A There is a valve operation device 7 that outputs an operation signal for fully closing the motor-operated valve 2A. (For example, refer to Patent Document 1.)
JP-A-5-341849

しかしながら、特許文献1に開示されているような従来の切換制御装置では、図5に示される如く、通常時にはA系及びB系の電動弁2A,2Bを全開として調節弁1A,1Bの開度制御の配分率を50:50[%]として制御し、A系の調節弁1Aの異常時にはA系の電動弁2Aを全閉にすると共に、その全閉時間に合せてB系の調節弁1Bの開度制御の配分率を徐々に増加させ、最終的には0:100[%]となるようにしているため、調節弁1A,1Bがそれぞれプラントとして必要な最低流量の半分の流量を調節できないといけなくなる。   However, in the conventional switching control device as disclosed in Patent Document 1, as shown in FIG. 5, the opening degree of the control valves 1A and 1B is normally set with the A-system and B-system electric valves 2A and 2B fully open. The control distribution ratio is controlled as 50:50 [%], and when the A system control valve 1A is abnormal, the A system electric valve 2A is fully closed, and the B system control valve 1B is matched to the fully closed time. Since the distribution ratio of the opening control of the valve is gradually increased to finally become 0: 100 [%], the control valves 1A and 1B each adjust the flow rate half of the minimum flow rate required for the plant. I have to do it.

具体例を挙げると、プラントとして必要な最低流量が10[ton/hr]であって、最大流量が100[ton/hr]であった場合、仮に、調節弁1A,1Bを完全に切り換えて使用するのであれば、該調節弁1A,1Bとしては、10[ton/hr]〜100[ton/hr]のレンジのものを使用すれば良いが、特許文献1に開示されている調節弁1A,1Bでは、通常時に開度制御の配分率を50:50として制御する関係上、5[ton/hr]〜100[ton/hr]のレンジのものを使用しなければならなくなる。   For example, if the minimum flow rate required for the plant is 10 [ton / hr] and the maximum flow rate is 100 [ton / hr], the control valves 1A and 1B are completely switched and used. If so, the control valves 1A and 1B may be those in the range of 10 [ton / hr] to 100 [ton / hr], but the control valves 1A and 1B disclosed in Patent Document 1 may be used. In 1B, since the distribution ratio of the opening degree control is controlled as 50:50 at the normal time, a range of 5 [ton / hr] to 100 [ton / hr] must be used.

これは、調節弁1A,1Bのレンジが大幅に広がることを意味し、そのアクチュエータ部分が大型化してコストアップにつながると共に、特に、前記アクチュエータ部分が電動モータの場合、電気容量が大きくなり、ランニングコストにも大きく影響を及ぼすという欠点を有していた。   This means that the range of the control valves 1A and 1B is greatly widened, and the actuator portion is enlarged, leading to an increase in cost. In particular, when the actuator portion is an electric motor, the electric capacity is increased and the running is increased. It had the disadvantage of having a significant impact on cost.

本発明は、斯かる実情に鑑み、制御対象値の変動を最小限に抑えつつ調節弁の切り換えを自動で行い得ると共に、調節弁のレンジを広げることなく、そのアクチュエータ部分の大型化を回避してコストダウンを図ることができる流体流通ラインの二重化自動切換制御装置を提供しようとするものである。   In view of such circumstances, the present invention can automatically switch the control valve while minimizing the fluctuation of the control target value, and avoids increasing the size of the actuator without expanding the range of the control valve. Thus, it is an object of the present invention to provide a dual automatic switching control device for a fluid distribution line that can reduce costs.

本発明は、流体が流通する主系ライン途中に設けられた主系調節弁と、
前記主系ラインの主系調節弁より上流側或いは下流側のうち少なくとも一方に設けられた主系遮断弁と、
前記主系ラインの主系調節弁と主系遮断弁とを迂回するよう並設される従系ライン途中に設けられた従系調節弁と、
前記従系ラインの従系調節弁より上流側或いは下流側のうち少なくとも一方に設けられた従系遮断弁と、
流体の制御対象値を検出する検出器と、
通常時には、従系遮断弁を全閉とし、主系遮断弁を全開とした状態で、検出器で検出された制御対象値が設定値となるよう主系調節弁の開度を自動調節する一方、主系調節弁に異常が発生した際には、該主系調節弁の開度をその時点での開度に保持し、主系遮断弁の開度を全開から全閉へ向け徐々に絞って行くと同時に、従系遮断弁の開度を全閉から全開とし、且つ検出器で検出された制御対象値が設定値となるよう従系調節弁の開度を自動調節する制御手段と
を備えたことを特徴とする流体流通ラインの二重化自動切換制御装置にかかるものである。
The present invention is a main system control valve provided in the middle of the main system line through which fluid flows,
A main system shut-off valve provided on at least one of the upstream side and the downstream side of the main system control valve of the main system line;
A subordinate control valve provided in the middle of the subordinate line that is arranged in parallel to bypass the main control valve and the main cutoff valve of the main line;
A slave cutoff valve provided on at least one of the upstream side and the downstream side of the slave control valve of the slave line;
A detector for detecting a fluid control target value;
Under normal conditions, with the slave shut-off valve fully closed and the main shut-off valve fully open, the opening of the main control valve is automatically adjusted so that the control target value detected by the detector becomes the set value. When an abnormality occurs in the main control valve, the opening of the main control valve is maintained at the current opening, and the opening of the main shut-off valve is gradually reduced from fully open to fully closed. And a control means for automatically adjusting the opening of the slave control valve so that the opening of the secondary shutoff valve is changed from fully closed to fully open and the control target value detected by the detector becomes a set value. The invention relates to a dual automatic switching control device for a fluid distribution line, characterized in that it is provided.

上記手段によれば、以下のような作用が得られる。   According to the above means, the following operation can be obtained.

通常時には、制御手段により、従系遮断弁が全閉とされ、主系遮断弁が全開とされた状態で、検出器で検出された制御対象値が設定値となるよう主系調節弁の開度が自動調節される一方、主系調節弁に異常が発生した際には、制御手段により、主系調節弁の開度がその時点での開度に保持され、主系遮断弁の開度が全開から全閉へ向け徐々に絞られて行くと同時に、従系遮断弁の開度が全閉から全開とされ、且つ検出器で検出された制御対象値が設定値となるよう従系調節弁の開度が自動調節される。   Under normal conditions, the control means opens the main control valve so that the control target value detected by the detector becomes the set value with the slave shut-off valve fully closed and the main shut-off valve fully opened. When the abnormality is generated in the main system control valve, the opening degree of the main system control valve is maintained at the current opening degree by the control means. Is gradually throttled from fully open to fully closed, and at the same time, the opening of the secondary shut-off valve is changed from fully closed to fully open, and the slave control is adjusted so that the control target value detected by the detector becomes the set value. The valve opening is automatically adjusted.

この結果、制御対象値の変動を最小限に抑えつつ調節弁の切り換えを自動で行うことが可能になると共に、主系調節弁と従系調節弁は、制御対象値が流量である場合、それぞれプラントとして必要な最低流量を調節できるものを使用すれば良く、主系調節弁と従系調節弁のレンジを広げなくて済み、そのアクチュエータ部分が大型化せずコストダウンが可能になり、更に、前記アクチュエータ部分が電動モータの場合には、電気容量が大きくならず、ランニングコストも抑えられることとなる。   As a result, it is possible to automatically switch the control valve while minimizing fluctuations in the control target value, and the main control valve and the subordinate control valve can each be controlled when the control target value is a flow rate. It is only necessary to use a plant that can adjust the minimum flow rate required for the plant, it is not necessary to expand the range of the main control valve and the subordinate control valve, the actuator part is not enlarged, and the cost can be reduced. When the actuator portion is an electric motor, the electric capacity is not increased, and the running cost is suppressed.

前記流体流通ラインの二重化自動切換制御装置においては、主系調節弁へ出力される開度指令と、主系調節弁の実際の開度との開度偏差の絶対値が許容値を越えている状態が所定時間継続した場合に、主系調節弁に異常が発生したと判定する異常検出手段を備えるようにすることができ、このようにすると、主系調節弁の異常を確実に検出することが可能となる。   In the dual automatic switching control device of the fluid distribution line, the absolute value of the opening deviation between the opening command output to the main control valve and the actual opening of the main control valve exceeds the allowable value. It is possible to provide an abnormality detecting means for determining that an abnormality has occurred in the main system control valve when the state continues for a predetermined time. In this way, the abnormality of the main system control valve can be reliably detected. Is possible.

又、前記流体流通ラインの二重化自動切換制御装置においては、主系ラインの主系調節弁より上流側と下流側の両方に主系遮断弁を設け、主系調節弁の異常発生時に上流側の主系遮断弁の開度が徐々に絞られて全閉となった時点で下流側の主系遮断弁を全閉とするよう構成することが望ましく、このようにすると、主系調節弁側から従系調節弁側への切り換えが完了した後、主系調節弁の修理等を即座に行うことが可能となる。   In the fluid flow line duplex automatic switching control device, a main system shut-off valve is provided on both the upstream side and the downstream side of the main system control valve of the main system line, and the upstream side when an abnormality occurs in the main control valve. It is desirable that the downstream main system shut-off valve be fully closed when the main system shut-off valve is gradually throttled and fully closed. After the switching to the secondary control valve is completed, the main control valve can be repaired immediately.

本発明の流体流通ラインの二重化自動切換制御装置によれば、制御対象値の変動を最小限に抑えつつ調節弁の切り換えを自動で行い得ると共に、調節弁のレンジを広げることなく、そのアクチュエータ部分の大型化を回避してコストダウンを図ることができるという優れた効果を奏し得る。   According to the duplex automatic switching control device of the fluid distribution line of the present invention, the control valve can be automatically switched while minimizing the fluctuation of the control target value, and the actuator portion can be obtained without widening the range of the control valve. It is possible to achieve an excellent effect that the cost can be reduced by avoiding the increase in size.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図1〜図3は本発明を実施する形態の一例であって、
給水或いは燃料等の流体が流通する主系ライン10A途中に、流体の制御対象値としての流量11を調節するための主系調節弁12Aを設け、前記主系ライン10Aの主系調節弁12Aより上流側及び下流側に、主系遮断弁13A及び主系遮断弁14Aを設け、
前記主系ライン10Aの主系調節弁12Aと主系遮断弁13A,14Aとを迂回するよう並設される従系ライン10B途中に、流体の流量11を調節するための従系調節弁12Bを設け、前記従系ライン10Bの従系調節弁12Bより上流側及び下流側に、従系遮断弁13B及び従系遮断弁14Bを設け、
前記主系ライン10Aの主系調節弁12A及び主系遮断弁13A,14Aを通過した流体、或いは前記従系ライン10Bの従系調節弁12B及び従系遮断弁13B,14Bを通過した流体の流量11を検出する検出器としての流量計15を設け、
通常時には、従系遮断弁13B,14Bを全閉とし、主系遮断弁13A,14Aを全開とした状態で、流量計15で検出された流量11が流量設定値16となるよう主系調節弁12Aの開度を自動調節する一方、主系調節弁12Aに異常が発生した際には、該主系調節弁12Aの開度をその時点での開度に保持し、主系遮断弁13Aの開度を全開から全閉へ向け徐々に絞って行くと同時に、従系遮断弁13B,14Bの開度を全閉から全開とし、且つ流量計15で検出された流量11が流量設定値16となるよう従系調節弁12Bの開度を自動調節する制御手段としての制御装置17を設けるようにしたものである。
1 to 3 are examples of embodiments for carrying out the present invention.
A main control valve 12A for adjusting the flow rate 11 as a fluid control target value is provided in the middle of the main system line 10A through which a fluid such as water supply or fuel flows, and from the main system control valve 12A of the main system line 10A. On the upstream side and downstream side, a main system cutoff valve 13A and a main system cutoff valve 14A are provided,
A slave control valve 12B for adjusting the flow rate 11 of the fluid is provided in the middle of the slave line 10B arranged in parallel to bypass the master control valve 12A and the master shut-off valves 13A, 14A of the master line 10A. Provided, a slave cutoff valve 13B and a slave cutoff valve 14B are provided upstream and downstream of the slave control valve 12B of the slave line 10B,
The flow rate of the fluid that has passed through the main system control valve 12A and the main system shut-off valves 13A, 14A of the main system line 10A, or the fluid that has passed through the sub system control valve 12B and the sub system shut-off valves 13B, 14B of the slave system line 10B. 11 is provided as a detector for detecting 11;
In a normal state, the main system control valve is set so that the flow rate 11 detected by the flow meter 15 becomes the flow rate set value 16 in a state where the sub system cutoff valves 13B and 14B are fully closed and the main system cutoff valves 13A and 14A are fully opened. While the opening degree of 12A is automatically adjusted, when an abnormality occurs in main system control valve 12A, the opening degree of main system control valve 12A is maintained at the opening degree at that time, and main system shutoff valve 13A The opening of the secondary shutoff valves 13B, 14B is changed from fully closed to fully open at the same time as the opening is gradually reduced from fully open to fully closed, and the flow rate 11 detected by the flow meter 15 is the flow set value 16 Thus, a control device 17 is provided as control means for automatically adjusting the opening of the secondary control valve 12B.

前記制御装置17は、
プラントにおける負荷指令等の指令に基づく流量設定値16と流量計15で検出された流量11との流量偏差18を求めて出力する減算器19と、
該減算器19から出力される流量偏差18を比例積分処理し、該流量偏差18をなくすための主系調節弁12A或いは従系調節弁12Bの開度指令20を出力する比例積分調節器21と、
前記主系調節弁12Aが正常である通常時には、a側に切り換えられ、前記比例積分調節器21から出力される開度指令20を開度指令22Aとして主系調節弁12Aへ出力する一方、主系調節弁12Aに異常が発生した際には、b側に切り換えられ、主系調節弁12Aの開度をその時点での開度に保持する切換器23Aと、
前記主系調節弁12Aが正常である通常時には、b側に切り換えられ、従系調節弁12Bの開度を全閉に保持する一方、主系調節弁12Aに異常が発生した際には、a側に切り換えられ、前記比例積分調節器21から出力される開度指令20を開度指令22Bとして従系調節弁12Bへ出力する切換器23Bと、
前記切換器23Aから出力される主系調節弁12Aの開度指令22Aと主系調節弁12Aの実際の開度24Aとの開度偏差25を求めて出力する減算器26と、
該減算器26から出力される開度偏差25の絶対値が許容値より大となった場合に「1」の信号27を出力するシグナルモニタスイッチ28と、
該シグナルモニタスイッチ28から出力される信号27が入力され、該信号27が「1」の状態が予め設定した時間T[sec]だけ継続された場合に、主系調節弁12Aより上流側の主系遮断弁13Aへインチング閉指令29を出力すると共に、従系遮断弁13B,14Bへ全開指令30を出力するオンディレイタイマ31と、
前記主系調節弁12Aより上流側の主系遮断弁13Aの実際の開度32Aが全閉(即ち0[%]以下)となった時点で、主系調節弁12Aより下流側の主系遮断弁14Aへ全閉指令33Aを出力するシグナルモニタスイッチ34と
を備えてなる構成を有している。
The control device 17
A subtractor 19 for obtaining and outputting a flow deviation 18 between the flow rate set value 16 based on a command such as a load command in the plant and the flow rate 11 detected by the flow meter 15;
A proportional-integral controller 21 that performs proportional-integral processing on the flow rate deviation 18 output from the subtractor 19 and outputs an opening degree command 20 of the main control valve 12A or the subordinate control valve 12B for eliminating the flow-rate deviation 18; ,
When the main system control valve 12A is normal, it is switched to the a side, and the opening degree command 20 output from the proportional-plus-integral regulator 21 is output as the opening degree command 22A to the main system control valve 12A. When an abnormality occurs in the system control valve 12A, the switch 23A is switched to the b side and holds the opening of the main system control valve 12A at the opening at that time;
When the main control valve 12A is normal, the main control valve 12A is switched to the b side, and the opening of the sub control valve 12B is kept fully closed. On the other hand, when an abnormality occurs in the main control valve 12A, a A switching device 23B that outputs the opening command 20 output from the proportional integral controller 21 to the slave control valve 12B as the opening command 22B;
A subtractor 26 that calculates and outputs an opening deviation 25 between the opening command 22A of the main control valve 12A output from the switch 23A and the actual opening 24A of the main control valve 12A;
A signal monitor switch 28 that outputs a signal 27 of “1” when the absolute value of the opening deviation 25 output from the subtractor 26 is larger than an allowable value;
When the signal 27 output from the signal monitor switch 28 is input and the state of the signal 27 is continued for a preset time T [sec], the main control valve 12A on the upstream side of the main control valve 12A. An on-delay timer 31 that outputs an inching close command 29 to the system shut-off valve 13A and outputs a full-open command 30 to the slave shut-off valves 13B and 14B;
When the actual opening 32A of the main system shutoff valve 13A upstream from the main system control valve 12A is fully closed (ie, 0 [%] or less), the main system shutoff downstream from the main system control valve 12A. And a signal monitor switch 34 that outputs a full-close command 33A to the valve 14A.

そして、前記制御装置17における減算器26とシグナルモニタスイッチ28とオンディレイタイマ31とによって異常検出手段35を構成し、主系調節弁12Aへ出力される開度指令22Aと、主系調節弁12Aの実際の開度24Aとの開度偏差25の絶対値が許容値を越えている状態が所定時間T[sec]だけ継続した場合に、主系調節弁12Aに異常が発生したと判定するようにしてある。   The subtractor 26, the signal monitor switch 28 and the on-delay timer 31 in the control device 17 constitute an abnormality detection means 35, and an opening degree command 22A output to the main system control valve 12A, and the main system control valve 12A. When the absolute value of the opening deviation 25 with respect to the actual opening 24A exceeds the allowable value continues for a predetermined time T [sec], it is determined that an abnormality has occurred in the main control valve 12A. It is.

次に、上記図示例の作用を説明する。   Next, the operation of the illustrated example will be described.

主系調節弁12Aが正常である通常時には、制御手段としての制御装置17により、従系遮断弁13B,14Bが全閉とされ、主系遮断弁13A,14Aが全開とされた状態で、前記制御装置17の減算器19において、プラントにおける負荷指令等の指令に基づく流量設定値16と流量計15で検出された流量11との流量偏差18が求められて比例積分調節器21へ出力され、該比例積分調節器21において、前記減算器19から出力される流量偏差18が比例積分処理され、該流量偏差18をなくすための主系調節弁12Aの開度指令20が、a側に切り換えられている切換器23Aを介して主系調節弁12Aへ出力され、前記流量計15で検出された制御対象値としての流量11が流量設定値16となるよう主系調節弁12Aの開度が自動調節される。   In a normal state where the main system control valve 12A is normal, the control device 17 serving as a control means fully closes the sub system shutoff valves 13B and 14B, and fully opens the main system shutoff valves 13A and 14A. In the subtractor 19 of the control device 17, a flow rate deviation 18 between the flow rate set value 16 based on a command such as a load command in the plant and the flow rate 11 detected by the flow meter 15 is obtained and output to the proportional-integral controller 21. In the proportional integration controller 21, the flow rate deviation 18 output from the subtractor 19 is proportionally integrated, and the opening degree command 20 of the main control valve 12A for eliminating the flow rate deviation 18 is switched to the a side. The opening degree of the main control valve 12A is output to the main system control valve 12A via the switching device 23A and the flow rate 11 as the control target value detected by the flow meter 15 becomes the flow rate set value 16. It is automatically adjusted.

尚、前記主系調節弁12Aが正常である通常時には、切換器23Bはb側に切り換えられており、従系調節弁12Bの開度は全閉に保持されている。   When the main control valve 12A is normal, the switch 23B is switched to the b side, and the opening of the sub control valve 12B is kept fully closed.

一方、異常検出手段35を構成する減算器26において、前記切換器23Aから出力される主系調節弁12Aの開度指令22Aと主系調節弁12Aの実際の開度24Aとの開度偏差25が求められてシグナルモニタスイッチ28へ出力され、前記減算器26から出力される開度偏差25の絶対値が許容値より大となった場合にシグナルモニタスイッチ28から「1」の信号27がオンディレイタイマ31へ出力され、該信号27が「1」の状態が予め設定した時間T[sec]だけ継続された場合には、前記主系調節弁12Aに異常が発生したとして、前記切換器23Aがb側に切り換えられ、主系調節弁12Aの開度がその時点での開度に保持され、前記オンディレイタイマ31から主系調節弁12Aより上流側の主系遮断弁13Aへインチング閉指令29が出力されると共に、従系遮断弁13B,14Bへ全開指令30が出力され、前記主系遮断弁13Aの開度が全開から全閉へ向け徐々に絞られて行くと同時に、前記従系遮断弁13B,14Bの開度が全閉から全開とされ、且つ前記切換器23Bがa側に切り換えられ、前記流量計15で検出された流量11が流量設定値16となるよう従系調節弁12Bの開度が自動調節される。   On the other hand, in the subtractor 26 constituting the abnormality detection means 35, an opening deviation 25 between the opening command 22A of the main control valve 12A output from the switch 23A and the actual opening 24A of the main control valve 12A. Is output to the signal monitor switch 28, and when the absolute value of the opening deviation 25 output from the subtractor 26 exceeds the allowable value, the signal 27 of "1" is turned on from the signal monitor switch 28. When the signal 27 is output to the delay timer 31 and the state of the signal 27 continues for a preset time T [sec], it is determined that an abnormality has occurred in the main control valve 12A, and the switch 23A Is switched to the b side, and the opening degree of the main system control valve 12A is maintained at the opening degree at that time, and is input from the on-delay timer 31 to the main system cutoff valve 13A upstream of the main system control valve 12A. And a fully open command 30 are output to the slave shut-off valves 13B and 14B, and the opening of the main shut-off valve 13A is gradually throttled from fully open to fully closed, The slave shut-off valves 13B and 14B are opened from fully closed to fully open, and the switch 23B is switched to the a side so that the flow rate 11 detected by the flow meter 15 becomes the flow rate set value 16. The opening degree of the system control valve 12B is automatically adjusted.

続いて、前記主系調節弁12Aより上流側の主系遮断弁13Aの実際の開度32Aが全閉(即ち0[%]以下)となった時点で、シグナルモニタスイッチ34から主系調節弁12Aより下流側の主系遮断弁14Aへ全閉指令33Aが出力され、該主系遮断弁14Aが全閉とされる。   Subsequently, when the actual opening degree 32A of the main system shutoff valve 13A upstream from the main system control valve 12A is fully closed (that is, 0 [%] or less), the signal control switch 34 controls the main system control valve. A fully closed command 33A is output to the main system shutoff valve 14A downstream of 12A, and the main system shutoff valve 14A is fully closed.

前記主系調節弁12Aに異常が発生した時点から従系調節弁12Bへの切り換えが完了するまでの、上流側の主系遮断弁13A、主系調節弁12A、下流側の主系遮断弁14A、上流側の従系遮断弁13B、従系調節弁12B、及び下流側の従系遮断弁14Bのそれぞれの開度の変化は、例えば、図2のように示され、又、前記主系調節弁12Aに異常が発生した時点から従系調節弁12Bへの切り換えが完了するまでの、主系ライン10A側、及び従系ライン10B側のそれぞれの流量変化と、総流量は、例えば、図3のように示される。   The upstream main system shutoff valve 13A, the main system control valve 12A, and the downstream main system shutoff valve 14A from when the abnormality occurs in the main system control valve 12A until the switching to the subordinate control valve 12B is completed. The changes in the respective opening degrees of the upstream-side slave cutoff valve 13B, the slave-side control valve 12B, and the downstream-side slave cutoff valve 14B are shown, for example, in FIG. The flow rate changes and the total flow rates on the main line 10A side and the subordinate line 10B side from when the abnormality occurs in the valve 12A until the switching to the subordinate control valve 12B is completed are, for example, FIG. As shown.

この結果、制御対象値としての流量11の変動を最小限に抑えつつ主系調節弁12Aから従系調節弁12Bへの切り換えを自動で行うことが可能になると共に、主系調節弁12Aと従系調節弁12Bは、それぞれプラントとして必要な最低流量を調節できるものを使用すれば良く、主系調節弁12Aと従系調節弁12Bのレンジを広げなくて済み、そのアクチュエータ部分が大型化せずコストダウンが可能になり、更に、前記アクチュエータ部分が電動モータの場合には、電気容量が大きくならず、ランニングコストも抑えられることとなる。   As a result, it is possible to automatically switch from the main control valve 12A to the subordinate control valve 12B while minimizing the fluctuation of the flow rate 11 as the control target value, and to connect the main control valve 12A to the subordinate control valve 12A. The system control valve 12B only needs to use a valve that can adjust the minimum flow rate required for each plant. It is not necessary to expand the range of the main system control valve 12A and the subordinate control valve 12B, and the actuator portion does not increase in size. In addition, the cost can be reduced. Furthermore, when the actuator portion is an electric motor, the electric capacity is not increased and the running cost can be suppressed.

しかも、本図示例においては、主系調節弁12Aへ出力される開度指令22Aと、主系調節弁12Aの実際の開度24Aとの偏差の絶対値が許容値を越えている状態が所定時間継続した場合に、主系調節弁12Aに異常が発生したと判定する異常検出手段35を、制御装置17における減算器26とシグナルモニタスイッチ28とオンディレイタイマ31とによって構成しているため、主系調節弁12Aの異常を確実に検出することが可能となる。   In addition, in the illustrated example, a state where the absolute value of the deviation between the opening command 22A output to the main control valve 12A and the actual opening 24A of the main control valve 12A exceeds the allowable value is predetermined. Since the abnormality detection means 35 that determines that an abnormality has occurred in the main control valve 12A when the time continues is constituted by the subtractor 26, the signal monitor switch 28, and the on-delay timer 31 in the control device 17, It is possible to reliably detect abnormality of the main system control valve 12A.

又、本図示例においては、主系ライン10Aの主系調節弁12Aより上流側と下流側の両方に主系遮断弁13A,14Aを設け、主系調節弁12Aの異常発生時に上流側の主系遮断弁13Aの開度が徐々に絞られて全閉となった時点で下流側の主系遮断弁14Aを全閉とするよう構成しているため、主系調節弁12A側から従系調節弁12B側への切り換えが完了した後、主系調節弁12Aの修理等を即座に行うことが可能となる。尚、前記下流側の主系遮断弁14Aや下流側の従系遮断弁14Bについては、必要に応じてその設置を省略することも可能である。   In the illustrated example, the main system shutoff valves 13A and 14A are provided on both the upstream side and the downstream side of the main system control valve 12A of the main system line 10A, and the upstream main control valve 12A is in an upstream state when an abnormality occurs. Since the downstream main system shut-off valve 14A is fully closed when the opening of the system shut-off valve 13A is gradually reduced and fully closed, the secondary system control is performed from the main system control valve 12A side. After the switching to the valve 12B side is completed, the main control valve 12A can be repaired immediately. The downstream main shut-off valve 14A and the downstream slave shut-off valve 14B can be omitted if necessary.

こうして、制御対象値としての流量11の変動を最小限に抑えつつ主系調節弁12Aから従系調節弁12Bへの切り換えを自動で行い得ると共に、主系調節弁12Aと従系調節弁12Bのレンジを広げることなく、そのアクチュエータ部分の大型化を回避してコストダウンを図ることができる。   In this way, it is possible to automatically switch from the main control valve 12A to the subordinate control valve 12B while minimizing the fluctuation of the flow rate 11 as the control target value, and the main control valve 12A and the subordinate control valve 12B. Without expanding the range, it is possible to reduce the cost by avoiding an increase in the size of the actuator portion.

尚、本発明の流体流通ラインの二重化自動切換制御装置は、上述の図示例にのみ限定されるものではなく、制御対象値としては、流体の流量11に限らず、圧力、温度、濃度等を選定することも可能なこと、又、主系調節弁12Aより上流側の主系遮断弁13Aの実際の開度32Aが全閉となった場合に、主系調節弁12Aより下流側の主系遮断弁14Aへ全閉指令33Aを出力するシグナルモニタスイッチ34を設ける代わりに、主系遮断弁13Aが全閉となった際にオンとなるリミットスイッチを設け、該リミットスイッチがオンとなった場合に制御装置17から下流側の主系遮断弁14Aへ全閉指令を出力するようにしても良いこと等、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   In addition, the dual automatic switching control device of the fluid distribution line of the present invention is not limited to the above-described example of illustration, and the control target value is not limited to the flow rate 11 of the fluid, but the pressure, temperature, concentration, etc. It is also possible to select the main system on the downstream side of the main control valve 12A when the actual opening 32A of the main shut-off valve 13A on the upstream side of the main control valve 12A is fully closed. When a limit switch that is turned on when the main system shutoff valve 13A is fully closed is provided instead of providing the signal monitor switch 34 that outputs the full close command 33A to the shutoff valve 14A, and the limit switch is turned on. Of course, it is possible to output a full close command from the control device 17 to the downstream main system shutoff valve 14A, and other various modifications can be made without departing from the scope of the present invention. .

本発明を実施する形態の一例を示す系統構成図である。It is a system configuration | structure figure which shows an example of the form which implements this invention. 本発明を実施する形態の一例における各弁の切換タイミングを示すタイミングチャートである。It is a timing chart which shows the switching timing of each valve in an example which embodies the present invention. 本発明を実施する形態の一例における各弁による流量挙動を示す線図である。It is a diagram which shows the flow volume behavior by each valve in an example of embodiment which implements this invention. 従来例を示す系統構成図である。It is a system configuration | structure figure which shows a prior art example. 従来例における各弁の開度及び流量の相関関係を示すタイミングチャートである。It is a timing chart which shows the correlation of the opening degree and flow volume of each valve in a prior art example.

符号の説明Explanation of symbols

10A 主系ライン
10B 従系ライン
11 流量(制御対象値)
12A 主系調節弁
12B 従系調節弁
13A 主系遮断弁
13B 従系遮断弁
14A 主系遮断弁
14B 従系遮断弁
15 流量計(検出器)
16 流量設定値(設定値)
17 制御装置(制御手段)
22A 開度指令
22B 開度指令
24A 実際の開度
25 開度偏差
29 インチング閉指令
30 全開指令
32A 開度
33A 全閉指令
35 異常検出手段
10A Main line 10B Subordinate line 11 Flow rate (control target value)
12A Main system control valve 12B Subsystem control valve 13A Main system shutoff valve 13B Subsystem shutoff valve 14A Main system shutoff valve 14B Subsystem shutoff valve 15 Flow meter (detector)
16 Flow rate setting value (setting value)
17 Control device (control means)
22A Opening command 22B Opening command 24A Actual opening 25 Opening deviation 29 Inching close command 30 Full open command 32A Opening 33A Full close command 35 Abnormality detection means

Claims (3)

流体が流通する主系ライン途中に設けられた主系調節弁と、
前記主系ラインの主系調節弁より上流側或いは下流側のうち少なくとも一方に設けられた主系遮断弁と、
前記主系ラインの主系調節弁と主系遮断弁とを迂回するよう並設される従系ライン途中に設けられた従系調節弁と、
前記従系ラインの従系調節弁より上流側或いは下流側のうち少なくとも一方に設けられた従系遮断弁と、
流体の制御対象値を検出する検出器と、
通常時には、従系遮断弁を全閉とし、主系遮断弁を全開とした状態で、検出器で検出された制御対象値が設定値となるよう主系調節弁の開度を自動調節する一方、主系調節弁に異常が発生した際には、該主系調節弁の開度をその時点での開度に保持し、主系遮断弁の開度を全開から全閉へ向け徐々に絞って行くと同時に、従系遮断弁の開度を全閉から全開とし、且つ検出器で検出された制御対象値が設定値となるよう従系調節弁の開度を自動調節する制御手段と
を備えたことを特徴とする流体流通ラインの二重化自動切換制御装置。
A main control valve provided in the middle of the main line through which fluid flows;
A main system shut-off valve provided on at least one of the upstream side and the downstream side of the main system control valve of the main system line;
A subordinate control valve provided in the middle of the subordinate line that is arranged in parallel to bypass the main control valve and the main cutoff valve of the main line;
A slave cutoff valve provided on at least one of the upstream side and the downstream side of the slave control valve of the slave line;
A detector for detecting a fluid control target value;
Under normal conditions, with the slave shut-off valve fully closed and the main shut-off valve fully open, the opening of the main control valve is automatically adjusted so that the control target value detected by the detector becomes the set value. When an abnormality occurs in the main control valve, the opening of the main control valve is maintained at the current opening, and the opening of the main shut-off valve is gradually reduced from fully open to fully closed. And a control means for automatically adjusting the opening of the slave control valve so that the opening of the secondary shutoff valve is changed from fully closed to fully open and the control target value detected by the detector becomes a set value. A dual automatic switching control device for a fluid distribution line, comprising:
主系調節弁へ出力される開度指令と、主系調節弁の実際の開度との開度偏差の絶対値が許容値を越えている状態が所定時間継続した場合に、主系調節弁に異常が発生したと判定する異常検出手段を備えた請求項1記載の流体流通ラインの二重化自動切換制御装置。   When the absolute value of the opening deviation between the opening command output to the main control valve and the actual opening of the main control valve exceeds the allowable value for a predetermined time, the main control valve The fluid flow line duplex automatic switching control device according to claim 1, further comprising an abnormality detecting means for determining that an abnormality has occurred in the fluid distribution line. 主系ラインの主系調節弁より上流側と下流側の両方に主系遮断弁を設け、主系調節弁の異常発生時に上流側の主系遮断弁の開度が徐々に絞られて全閉となった時点で下流側の主系遮断弁を全閉とするよう構成した請求項1又は2記載の流体流通ラインの二重化自動切換制御装置。   A main system shut-off valve is provided on both the upstream and downstream sides of the main system control valve in the main system line, and when the main control valve malfunctions, the upstream main system shut-off valve is gradually throttled and fully closed. The dual automatic switching control device for a fluid circulation line according to claim 1 or 2, wherein the downstream main system shut-off valve is fully closed at that time.
JP2004308027A 2004-10-22 2004-10-22 Duplex automatic switching control device for fluid distribution line Pending JP2006119968A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101468288B (en) * 2007-12-24 2011-09-07 同方环境股份有限公司 Desulfurizer suitable for sulfuric dioxide of large-scope change and control method thereof
CN102889413A (en) * 2012-10-21 2013-01-23 上海恳工自动化设备有限公司 Intelligent electric control system and method of redundancy actuator for valve
CN112666899A (en) * 2019-10-16 2021-04-16 新特能源股份有限公司 Control method and system of regulating valve group, electronic equipment and storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101468288B (en) * 2007-12-24 2011-09-07 同方环境股份有限公司 Desulfurizer suitable for sulfuric dioxide of large-scope change and control method thereof
CN102889413A (en) * 2012-10-21 2013-01-23 上海恳工自动化设备有限公司 Intelligent electric control system and method of redundancy actuator for valve
CN112666899A (en) * 2019-10-16 2021-04-16 新特能源股份有限公司 Control method and system of regulating valve group, electronic equipment and storage medium

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