JP5492459B2 - Pressure control device and pressure control method in water distribution network - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 89
- 238000000034 method Methods 0.000 title claims description 5
- 239000008399 tap water Substances 0.000 claims 2
- 235000020679 tap water Nutrition 0.000 claims 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 1
- 230000010354 integration Effects 0.000 description 6
- 239000013256 coordination polymer Substances 0.000 description 4
- 238000007373 indentation Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Description
本発明は、配水池から需要家に上水を供給する配水網への圧力変動を抑止する配水網内における圧力制御装置及び圧力制御方法に関する。 The present invention relates to a pressure control device and a pressure control method in a distribution network that suppresses pressure fluctuations from a distribution reservoir to a distribution network that supplies water to consumers.
〔特許文献1〕に記載のように、従来の技術では、配水池から需要家に上水を供給する配水網に可変速ポンプ及びこれに並列設置された返送弁を有する配水設備Aに別な配水設備、例えば配水設備Bが接続された配水網において、深夜等でポンプ吐出流量が減少し配水設備Aが最低回転数運転領域以下での配水が必要となる場合にはポンプのキャビテーションを防ぐため、返送弁開することで配水をポンプ井に戻しながら配水を続けることでポンプ継続運転する方法がとられている。 As described in [Patent Document 1], in the conventional technology, a distribution network that supplies water to consumers from a distribution reservoir is different from a distribution facility A that has a variable speed pump and a return valve installed in parallel with the variable speed pump. In order to prevent pump cavitation when the pump discharge flow rate decreases at midnight etc. in the distribution network to which the distribution facility B, for example, the distribution facility B is connected, and the distribution facility A needs to distribute water below the minimum rotation speed operation range. The pump is continuously operated by continuing the water distribution while returning the water to the pump well by opening the return valve.
図3に示すように、配水池から需要家に上水を供給する配水網に可変速ポンプ及び可変速ポンプに並列に設置された返送弁とを有する配水設備Aが設置され、配水設備Aとは別の配水設備、例えば配水設備Bが接続された配水網では、配水設備Bからの押込圧力が大きいと、配水設備Aの管路損失が大きくなって配水圧力が上昇するため、圧力制御器は回転数を減速する方向へ動作する。その結果、図4に示すように、回転数が最低回転数まで低下したポンプは、配水流量の低下から無送水によるポンプ停止を引き起こし、配管内圧力が急変するため濁水発生の原因となる。このため、他の配水設備からの押込圧力で無送水になることが予想される場合には、ポンプを全台停止して他の配水設備により需要家への配水を行うが、無送水検出近傍までプラント監視を継続する必要があり、運転員の負担を余儀なくされる。また、予め全台停止する場合には、ポンプ回転数が高い領域から急激な停止に至るため配水網の圧力変動が避けられなかった。 As shown in FIG. 3, a water distribution facility A having a variable speed pump and a return valve installed in parallel with the variable speed pump is installed in a distribution network that supplies clean water from a distribution reservoir to consumers. In a distribution network to which another distribution facility, for example, distribution facility B is connected, if the indentation pressure from distribution facility B is large, the pipe loss of distribution facility A increases and the distribution pressure rises. Operates in a direction to reduce the rotational speed. As a result, as shown in FIG. 4, the pump whose rotational speed has decreased to the minimum rotational speed causes pump stop due to no water supply due to a decrease in the water distribution flow rate, and the pressure in the pipe changes suddenly, causing turbid water generation. For this reason, when it is expected that no water will be delivered due to the indentation pressure from other water distribution facilities, all pumps will be stopped and water will be distributed to customers using other water distribution facilities. It is necessary to continue the plant monitoring until the operator is burdened. Further, when all the units are stopped in advance, the pressure fluctuation of the water distribution network is unavoidable because the pump reaches a sudden stop from the region where the pump speed is high.
本発明の目的は、配水網へ圧力変動を与えることなくポンプの全台停止が可能となる配水網内における圧力制御装置及び圧力制御方法を提供することにある。 An object of the present invention is to provide a pressure control device and a pressure control method in a water distribution network that can stop all pumps without giving pressure fluctuations to the water distribution network.
上記目的を達成するために、本発明は、配水池から需要家に上水を供給する配水網に複数のポンプと流量調節装置を備える返送弁が並列に設けられた配水設備において、可変速ポンプを目標圧力へ制御する圧力制御器と実配水流量と実配水圧力から他配水設備との押合状態を検出してポンプ回転数から全台停止タイミングを判定する判定器と、一連の返送弁開閉動作と返送流量から開閉時期を判定する開度調節器を備え、自配水設備のポンプの全台停止時に発生する圧力変動を抑止するものである。 In order to achieve the above object, the present invention provides a variable speed pump in a water distribution facility in which a return valve having a plurality of pumps and a flow control device is provided in parallel in a water distribution network that supplies clean water from a distribution reservoir to consumers. Pressure controller that controls the pressure to the target pressure, a judgment device that detects the push-in state of the other water distribution equipment from the actual water flow rate and actual water distribution pressure, and determines the stop timing of all units from the pump rotation speed, and a series of return valve opening and closing operations And an opening degree regulator that determines the opening and closing timing from the return flow rate, and suppresses pressure fluctuations that occur when all pumps of the self-distribution equipment are stopped.
本発明によれば、押込状態を判断してポンプ無送水停止前に返送弁の開度制御を行うことで、配水網へ圧力変動を与えることなくポンプの全台停止が可能となる。 According to the present invention, it is possible to stop all pumps without giving a pressure fluctuation to the water distribution network by determining the push-in state and controlling the opening degree of the return valve before stopping the pump non-water supply.
本発明の一実施例を図1,図2に基づいて説明する。図1は本実施例の圧力制御装置の構成図である。 An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a pressure control device according to the present embodiment.
本実施例の第1の配水設備は、ポンプ井13から需要家14に上水を供給する配水網に複数の可変速ポンプP1〜Pnが設置され、可変速ポンプP1〜Pnと並列して返送弁15が設置されている。第1の配水設備とは別に、配水網には図示しない第2の配水設備が接続されている。
In the first water distribution facility of the present embodiment, a plurality of variable speed pumps P 1 to P n are installed in a distribution network that supplies clean water from the pump well 13 to the
圧力制御装置1には、配水圧力設定器2が設けられ、配水圧力設定器2にて設定された目標圧力となるように、ポンプの可変速駆動装置11を制御する圧力制御器10が設けられている。圧力制御器10には、配水圧力計17で検出された配水圧力CPがフィードバックされている。
The
又、ポンプ規定回転数設定器3,配水流量規定値設定器4,配水圧力規定値設定器5が設けられ、それぞれポンプ全台停止時期判定器8に接続されている。返送井目標開度設定器6,返送水流量積算設定器7が設けられ、返送弁開度制御器9に接続されている。返送弁開度制御器9は、弁開閉装置12を介して返送弁15に接続されている。ポンプ規定回転数設定器3では、規定回転数NLが設定され、配水流量規定値設定器4では、規定流量FLが設定され、配水圧力規定値設定器5では、規定圧力PHが設定される。返送井目標開度設定器6では、返送弁15の目標開度Z1が設定され、返送水流量積算設定器7では、返送流量の積算値Qが設定される。
Further, a pump specified rotation speed setting device 3, a water distribution flow rate specified value setting device 4, and a water distribution pressure specified value setting device 5 are provided, and are connected to the pump all-stop-time determination device 8, respectively. A return well target opening setting device 6 and a return water flow rate integration setting device 7 are provided and connected to a return valve opening controller 9. The return valve opening controller 9 is connected to the
ポンプ全台停止時期判定器8には、可変速ポンプP1〜Pnに設けられたポンプ回転数検出器19で検出されたポンプ回転数N,配水圧力計17で検出された配水圧力CP,配水流量計18で検出された配水流量CFがフィードバックされ、ポンプ全台停止時期判定器8は返送弁開度制御器9に接続されている。
The pump stop time determination unit 8 includes a pump rotation number N detected by a pump
配水網に複数の配水設備が接続され、深夜等の上水需要量が低下する時間帯に、配水設備をポンプ1台で最小回転数にて運転している場合には、別な第2の配水設備からの押込圧力により、配水設備の吐出側近傍で押合いによる無送水が発生するためポンプ全台停止する必要がある。ポンプを全台停止する時に発生する圧力変動を抑止するため、返送弁15を有する配管20をポンプと並列設置して、無送水となる前に返送弁15を開状態にして、第1の配水設備の吐出圧力及び第2の配水設備の押込圧力の双方をポンプ井13へ逃がしながらポンプ全台停止することで配水網への圧力変動を抑止する。
When a plurality of water distribution facilities are connected to the water distribution network and the water distribution facility is operated at the minimum number of revolutions with one pump during a time period when the demand for water supply decreases at midnight, etc., another second The pumping pressure from the water distribution equipment causes non-feeding water by pushing near the discharge side of the water distribution equipment, so it is necessary to stop all pumps. In order to suppress pressure fluctuations that occur when all the pumps are stopped, the
ポンプ全台停止時期判定器8は、押合状態を検出するため、配水流量規定値設定器4から入力された規定流量FL,配水圧力規定値設定器5から入力された規定圧力PH,ポンプ規定回転数設定器3から入力された規定回転数NLにより、ポンプ全台停止時期を判定する。 In order to detect the push-in state, the pump all-stop-time determination unit 8 detects the specified flow rate FL input from the distribution flow rate specified value setting unit 4, the specified pressure PH input from the distribution pressure specified value setter 5, and the pump specified rotation. Based on the specified rotational speed NL input from the number setting device 3, the pump stop time of all pumps is determined.
ポンプ全台停止時期判定器8は、入力された配水圧力CPと配水流量CF及びポンプ回転数Nから、数1から数3を演算し、図2の時刻t1で示すように、数1及び数2を満足した場合は、配水流量が出ていないにも関わらず、配水圧力が上昇した場合を押合状態と判断し、且つ数3を満足してポンプが最低回転数領域Nminに到達する前をポンプ停止時期にあると判断する。
The pump all-stop-time determination unit 8 calculates
〔数1〕
配水圧力CP>規定圧力PH …(1)
〔数2〕
配水流量CF<規定流量FL …(2)
〔数3〕
ポンプ回転数N<規定回転数NL …(3)
[Equation 1]
Distribution pressure CP> regulated pressure PH (1)
[Equation 2]
Water distribution flow CF <regulated flow FL (2)
[Equation 3]
Pump rotational speed N <specified rotational speed NL (3)
返送弁開度制御器9は、この判断に基づいて返送弁15の開閉動作と開閉タイミングを決定し、返送弁開度制御器9で設定された返送弁15の目標開度Z1,返送水流量積算設定器7で設定された返送流量の積算値Qとなるように制御する。
The return valve opening controller 9 determines the opening / closing operation and opening / closing timing of the
例えば、図2の時刻t2で示すように、ポンプ全台停止時期判定器8は、判断結果を返送弁開度制御器9へ返送弁動作指令として出力し、返送弁開度制御器9は弁開閉装置12を制御して返送弁15を目標開度Z1まで開動作を行う。
For example, as shown at time t2 in FIG. 2, the pump stop timing determination unit 8 outputs the determination result to the return valve opening controller 9 as a return valve operation command, and the return valve opening controller 9 The opening /
この時に配水網への圧力変動および他配水設備の圧力制御にハンチング等の制御外乱を与えないように、一定の変化幅ΔMVと一定の周期Δtを設定し、返送弁開度CZの出力値であるMVを数4にて演算する。数4の演算実行周期はΔtであり、SV=MVnとなるまで演算を実行する。 At this time, a constant change width ΔMV and a constant period Δt are set so as not to give control disturbance such as hunting to the pressure fluctuation to the water distribution network and the pressure control of other water distribution facilities, and the output value of the return valve opening CZ A certain MV is calculated by Equation 4. The calculation execution cycle of Equation 4 is Δt, and the calculation is executed until SV = MVn.
〔数4〕
MVn=MVn-1+ΔMV …(4)
[Equation 4]
MVn = MV n-1 + ΔMV (4)
他配水設備の圧力制御の外乱や濁水を防ぐため、又、配管に圧力負担を与えないように変化幅ΔMVを小さくし、演算実行周期Δtを長くすることで他配水設備の制御や配管への負担を与えずに押込圧力を返送配管を通じてポンプ井13へ戻すことができる。 In order to prevent disturbances and turbid water in the pressure control of other water distribution facilities, and to reduce the change width ΔMV so as not to give a pressure burden to the piping, and lengthen the calculation execution period Δt, The pushing pressure can be returned to the pump well 13 through the return pipe without giving a burden.
返送配管20内の水は長時間の滞留により水質が悪化しているため、ポンプ井13へ返送する水量を最小限とすべく返送水流量積算CQが返送水流量積算設定器7で設定された目標値Qまで押込圧力を返送する。時刻t3で、目標値Qへ到達すると、返送弁開度制御器9はポンプ全台停止可能であることを運転員へ発報する。
Since the water quality in the
ポンプ全台停止後は需要家への給水は配水設備Bから行うため、時刻t4で、返送弁開度制御器9は直ちに閉動作を行う。この時に返送弁を急速に閉動作すると需要家へ圧力変動を与える要因になるため、数4で示される変化幅及び演算周期で徐々に返送弁を閉める。 After all the pumps are stopped, water is supplied to the customer from the water distribution facility B. Therefore, the return valve opening controller 9 immediately closes at time t4. If the return valve is rapidly closed at this time, it causes a pressure fluctuation to the consumer. Therefore, the return valve is gradually closed with a change width and a calculation cycle expressed by Equation 4.
本実施例によれば、押込状態を判断してポンプ無送水停止前に返送弁を数4に示す開度制御を行うことで、配水網へ圧力変動を与えることなくポンプの全台停止が可能となる。これにより他配水設備への急激な制御変動及び老朽化した配管に圧力負担を最小限に抑えることができるので赤水等の濁水発生を防止できる。 According to the present embodiment, it is possible to stop all pumps without giving pressure fluctuation to the water distribution network by judging the pushing state and performing the opening control of the return valve as shown in Equation 4 before stopping pump non-water supply. It becomes. As a result, it is possible to minimize the pressure burden on the rapid control fluctuations and aging pipes to other water distribution facilities, so that generation of muddy water such as red water can be prevented.
1 圧力制御装置
2 配水圧力設定器
3 ポンプ規定回転数設定器
4 配水流量規定値設定器
5 配水圧力規定値設定器
6 返送井目標開度設定器
7 返送水流量積算設定器
8 ポンプ全台停止時期判定器
9 返送弁開度制御器
10 圧力制御器
11 可変速駆動装置
12 弁開閉装置
13 ポンプ井
14 需要家
DESCRIPTION OF
Claims (3)
該第1の配水設備に接続された別の第2の配水設備とを有し、ポンプ全台停止時期判定器により、検出した配水流量,配水圧力,ポンプ回転数からポンプ全台停止時期を判定し、該判定結果から返送弁開度制御器により無送水となる前に返送弁を開動作して前記第1の配水設備の吐出圧力及び前記第2の配水設備の押込圧力をポンプ井へ逃がすことで需要家への配水圧力変動を抑止する配水網内における圧力制御方法。 A first water distribution facility having a variable speed pump and a return valve installed in parallel with the variable speed pump in a distribution network for supplying tap water to consumers from the distribution reservoir;
And a separate second water distribution facilities connected to the first water distribution facilities, determined by the pump total base stop timing determination unit, the detected distributed water flow, water distribution pressure, the total base termination timing pump from the pump speed Based on the determination result, the return valve opening controller opens the return valve before the non-water supply is performed, and the discharge pressure of the first water distribution facility and the pushing pressure of the second water distribution facility are released to the pump well. The pressure control method in the distribution network which suppresses the distribution pressure fluctuation to the consumer.
該第1の配水設備に接続された別の第2の配水設備とを有し、検出した配水流量,配水圧力,ポンプ回転数からポンプ全台停止時期を判定するポンプ全台停止時期判定器と、
該ポンプ全台停止時期判定器の判定結果から無送水となる前に返送弁を開動作して前記第1の配水設備の吐出圧力及び前記第2の配水設備の押込圧力をポンプ井へ逃がすように制御する返送弁開度制御器を備えた配水網内における圧力制御装置。 A first water distribution facility having a variable speed pump and a return valve installed in parallel with the variable speed pump in a distribution network for supplying tap water to consumers from the distribution reservoir;
And a separate second water distribution facilities connected to the first water distribution facilities, and detected distributed water flow, water distribution pressure, pumps Full pedestal termination timing determining pumps Full platform termination timing from the pump rotational speed determiner ,
The return valve is opened before the non-water supply from the determination result of the pump stoppage time determining unit so that the discharge pressure of the first water distribution facility and the pushing pressure of the second water distribution facility are released to the pump well. The pressure control apparatus in the water distribution network provided with the return valve opening degree controller which controls to.
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