JP7375882B2 - Control method for pure water production equipment - Google Patents

Control method for pure water production equipment Download PDF

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JP7375882B2
JP7375882B2 JP2022150103A JP2022150103A JP7375882B2 JP 7375882 B2 JP7375882 B2 JP 7375882B2 JP 2022150103 A JP2022150103 A JP 2022150103A JP 2022150103 A JP2022150103 A JP 2022150103A JP 7375882 B2 JP7375882 B2 JP 7375882B2
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洋 飯塚
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Kurita Water Industries Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は純水製造装置の制御方法に係り、特に原水供給機構から送水された原水を処理して純水を製造する純水製造装置を制御する方法に関する。 The present invention relates to a method for controlling a pure water production apparatus, and more particularly to a method for controlling a pure water production apparatus that processes raw water sent from a raw water supply mechanism to produce pure water.

加圧ポンプ、ＲＯ装置（逆浸透膜分離装置）、脱気装置、電気脱イオン装置等を有する純水製造装置（例えば特許文献１）においては、流量計によって透過水や濃縮水等の流量を検出し、加圧ポンプを制御する。また、純水製造装置には、流量計以外にも、温度、圧力、水質（ｐＨ、電気伝導度、シリカ濃度など）等を測定する種々のセンサが設けられている。 In a pure water production device (for example, Patent Document 1) that includes a pressure pump, an RO device (reverse osmosis membrane separation device), a deaerator, an electrodeionization device, etc., the flow rate of permeated water, concentrated water, etc. is measured using a flow meter. Detect and control the pressurizing pump. Furthermore, in addition to the flowmeter, the pure water production apparatus is provided with various sensors that measure temperature, pressure, water quality (pH, electrical conductivity, silica concentration, etc.), and the like.

流量計に気泡が混入したりすることにより、流量計の検出値が真値から大きく乖離し、例えば真値よりも著しく大きい検出値を出力することがある。従来の純水製造装置では、流量計の検出値が基準値を超えた場合には、ＲＯ装置などの機器保護のために加圧ポンプの送水量を低下させて純水製造装置を停止させた停止モードとするよう制御が行われる。その他のセンサに異常が生じた場合も同様である。 If air bubbles enter the flowmeter, the detected value of the flowmeter may deviate greatly from the true value, and for example, the flowmeter may output a detected value that is significantly larger than the true value. In conventional pure water production equipment, when the detected value of the flow meter exceeds the standard value, the water flow rate of the pressure pump is reduced and the pure water production equipment is stopped to protect equipment such as RO equipment. Control is performed to set the stop mode. The same applies when an abnormality occurs in other sensors.

なお、純水製造装置を停止させる代りに、加圧ポンプの送水量を少なくしたスロー運転モードにて純水製造装置の稼動を継続することも検討されている。 In addition, instead of stopping the pure water producing apparatus, it is also being considered to continue operating the pure water producing apparatus in a slow operation mode in which the amount of water fed by the pressurizing pump is reduced.

特開２００４－１６７４２３号公報Japanese Patent Application Publication No. 2004-167423

純水製造装置本体に異常がない場合に、センサの異常で純水製造装置の稼動を停止したり、スロー運転モードとすると、それだけ純水の製造効率が低下する。 When there is no abnormality in the main body of the pure water production apparatus, if the operation of the pure water production apparatus is stopped due to an abnormality in the sensor or the pure water production apparatus is put into a slow operation mode, the efficiency of producing pure water will decrease accordingly.

本発明は、純水製造装置に設置されたセンサの異常を的確に判定することができる純水製造装置の制御方法を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a method for controlling a pure water production apparatus that can accurately determine an abnormality in a sensor installed in the pure water production apparatus.

第１発明の純水製造装置の制御方法は、原水を、少なくとも加圧ポンプ及びＲＯ装置を有する純水製造装置で処理して純水を製造する純水製造装置を制御する方法であって、前記純水製造装置に設けられたセンサの検出値の所定時間内における最大値が所定の上限値を上回るか又は最小値が所定の下限値を下回る場合にアラームを出力することを特徴とする。 A method for controlling a pure water production apparatus according to a first aspect of the invention is a method for controlling a pure water production apparatus that produces pure water by treating raw water with a pure water production apparatus having at least a pressure pump and an RO device, the method comprising: It is characterized in that an alarm is output when the maximum value of the detection value of the sensor provided in the pure water production apparatus within a predetermined time period exceeds a predetermined upper limit value or the minimum value falls below a predetermined lower limit value.

第２発明の純水製造装置の制御方法は、原水を、少なくとも加圧ポンプ及びＲＯ装置を有する純水製造装置で処理して純水を製造する純水製造装置を制御する方法であって、前記純水製造装置に設けられたセンサの検出値の所定時間内における最大値と最小値の差と平均値との比が所定値以下である場合にアラームを出力する。 A method for controlling a pure water production apparatus according to a second aspect of the invention is a method for controlling a pure water production apparatus that produces pure water by treating raw water with a pure water production apparatus having at least a pressure pump and an RO device, the method comprising: An alarm is output when the ratio of the difference between the maximum value and the minimum value and the average value of the detected values of the sensor provided in the pure water production apparatus within a predetermined time is equal to or less than a predetermined value.

第３発明の純水製造装置の制御方法は、原水を、少なくとも加圧ポンプ及びＲＯ装置を有する純水製造装置で処理して純水を製造する純水製造装置を制御する方法であって、上流側にポンプが設置されている流量計の検出値が、当該ポンプの吐出量の仕様値よりも大きくなった場合にアラームを出力する。 A method for controlling a pure water production apparatus according to a third aspect of the invention is a method for controlling a pure water production apparatus that produces pure water by treating raw water with a pure water production apparatus having at least a pressure pump and an RO device, the method comprising: An alarm is output when the detected value of a flow meter with a pump installed on the upstream side becomes larger than the specified value of the discharge amount of the pump.

本発明の一態様では、前記純水製造装置は、直列に多段に設置されたＲＯ装置と、最終段の該ＲＯ装置からの透過水を脱気処理する脱気装置と、該脱気装置からの脱気処理水が供給される電気脱イオン装置とを有する。 In one aspect of the present invention, the pure water production apparatus includes RO devices installed in multiple stages in series, a deaerator that deaerates permeated water from the RO device in the final stage, and and an electrodeionization device to which degassed water is supplied.

本発明の純水製造装置の制御方法では、流量計等のセンサ検出値に異常が生じたどうかを運転担当者の経験や確認頻度によることなく、的確に判定することができ、純水製造装置が無駄に停止モード又はスロー運転モードとなることが防止されると共に、センサの異常を見逃すことが防止される。 In the method for controlling a pure water production device of the present invention, it is possible to accurately determine whether or not an abnormality has occurred in the detected value of a sensor such as a flow meter, regardless of the experience of the operator or the frequency of confirmation, and the pure water production device This prevents the sensor from going into stop mode or slow operation mode unnecessarily, and also prevents sensor abnormalities from being overlooked.

実施の形態を示す純水製造装置の構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the pure water manufacturing apparatus which shows embodiment.

以下、図面を参照して実施の形態について説明する。 Embodiments will be described below with reference to the drawings.

図１は本発明の実施の形態を示している。河川水、井水、工業用水、回収水などを原水源とした原水が原水タンク１に送水される。原水タンク１内の原水は、給水ポンプ２、配管３、保安フィルタ４、配管５、加圧ポンプ６、配管７を介して第１ＲＯ装置８に供給される。第１ＲＯ装置８の透過水は、配管９を介して第２ＲＯ装置１０に供給され、その透過水が配管１１を介して脱気装置１２に供給される。脱気装置１２で脱気処理された水は、配管１３を介して電気脱イオン装置１４に供給され、その透過水が配管１５より純水として需要先へ送水される。 FIG. 1 shows an embodiment of the invention. Raw water sourced from river water, well water, industrial water, recovered water, etc. is sent to the raw water tank 1. The raw water in the raw water tank 1 is supplied to the first RO device 8 via the water supply pump 2, piping 3, safety filter 4, piping 5, pressure pump 6, and piping 7. The permeated water from the first RO device 8 is supplied to the second RO device 10 via piping 9, and the permeated water is supplied to the deaerator 12 via piping 11. The water degassed by the deaerator 12 is supplied to the electrodeionizer 14 via a pipe 13, and the permeated water is sent to a consumer as pure water through a pipe 15.

脱気装置１２としては、膜脱気装置など各種のものが用いられる。膜脱気装置では、気体透過膜の１次側に水を通水し、２次側を真空ポンプで減圧する。 As the deaerator 12, various types such as a membrane deaerator can be used. In a membrane deaerator, water is passed through the primary side of a gas permeable membrane, and the pressure on the secondary side is reduced using a vacuum pump.

なお、配管１５に三方弁１６を介して分岐配管１７が接続されており、配管１５からの純水を原水タンク１（配管３，５又はそれらに必要に応じて設けられる給水槽であってもよい。）に送水可能としている。 A branch pipe 17 is connected to the pipe 15 via a three-way valve 16, and the pure water from the pipe 15 is supplied to the raw water tank 1 (or the pipes 3 and 5, or a water tank provided for them as necessary). (Good).

また、ＲＯ装置８，１０の濃縮水（第１濃縮水、第２濃縮水）を原水タンク１に返送する配管１８，１９が設けられている。図示は省略するが、電気脱イオン装置１４の濃縮水を原水タンク１に返送するラインが設けられている。配管９，１１，１８，１９にはそれぞれ流量制御弁（図示略）が設けられている。 Further, pipes 18 and 19 are provided for returning concentrated water (first concentrated water, second concentrated water) from the RO devices 8 and 10 to the raw water tank 1. Although not shown, a line for returning concentrated water from the electrodeionization device 14 to the raw water tank 1 is provided. Each of the pipes 9, 11, 18, and 19 is provided with a flow control valve (not shown).

第１ＲＯ装置８の第１濃縮水は、脱塩処理された後、原水タンク１に返送される。第２ＲＯ装置１０の第２濃縮水及び電気脱イオン装置１４の濃縮水は、そのまま原水タンク１に返送される。 The first concentrated water from the first RO device 8 is returned to the raw water tank 1 after being desalinated. The second concentrated water of the second RO device 10 and the concentrated water of the electrodeionization device 14 are returned to the raw water tank 1 as they are.

前記配管３（又は配管５）に原水供給圧を測定する圧力センサ２０が設けられ、配管９，１１，１８，１９にそれぞれ流量計２２～２５が設けられ、該センサ２０及び流量計２２～２５の検出信号が制御装置２１に入力される。制御装置２１は、これらの入力信号に基づいて、各配管９，１１，１８，１９の流量が目標範囲となるように、加圧ポンプ６の回転数をＰＩＤ制御すると共に、各配管９，１１，１８，１９の流量制御弁の開度を制御する。 The pipe 3 (or pipe 5) is provided with a pressure sensor 20 for measuring the raw water supply pressure, and the pipes 9, 11, 18, and 19 are provided with flow meters 22 to 25, respectively. The detection signal is input to the control device 21. Based on these input signals, the control device 21 performs PID control on the rotation speed of the pressurizing pump 6 so that the flow rate of each pipe 9, 11, 18, 19 falls within the target range, and also controls the rotation speed of each pipe 9, 11. , 18 and 19.

制御装置２１は、純水製造装置の１又は２以上の各所に設けられた温度センサ、圧力センサや流量計（流量センサ）のほか、ｐＨ計（ｐＨセンサ）、水質（電気伝導度、シリカ濃度等）センサなど、各種センサの検出値が入力されており、純水製造装置の作動に異常がないか判定し、異常と判定される場合には、アラームを管理センターや運転担当者の携帯端末等に送信する。 The control device 21 includes temperature sensors, pressure sensors, and flow meters (flow rate sensors) installed at one or more locations in the pure water production device, as well as a pH meter (pH sensor), water quality (electrical conductivity, silica concentration), etc. etc.) The detection values of various sensors such as sensors are input, and it is determined whether there is any abnormality in the operation of the pure water production equipment. If it is determined that there is an abnormality, an alarm is sent to the management center or the mobile terminal of the operator. etc.

本発明では、これら温度センサ、圧力センサ、流量計、ｐＨ計、水質センサ等に異常が生じたかどうかを次のようにして判定する。異常と判定されたセンサは、直ちに、又は次回のメンテナンス時に修理又は交換する。 In the present invention, whether or not an abnormality has occurred in these temperature sensors, pressure sensors, flow meters, pH meters, water quality sensors, etc. is determined as follows. A sensor determined to be abnormal will be repaired or replaced immediately or during the next maintenance.

［レンジオーバーに基づく判定］
センサ検出値の直近の所定時間（例えば２４時間特に６０ｍｉｎ程度）における最大値が所定の上限値を上回るか、又は最小値が所定の下限値を下回るときに、センサに異常が生じたものと判定し、アラームを出力する。 [Judgment based on over range]
It is determined that an abnormality has occurred in the sensor when the maximum value of the sensor detection value in the most recent predetermined time period (for example, 24 hours, especially about 60 minutes) exceeds a predetermined upper limit value, or the minimum value falls below a predetermined lower limit value. and outputs an alarm.

所定の上限値としては、当該センサの出力範囲の９５％として設定される。ただし、９５％は一例であり、９０～９８％の間から選定されればよい。 The predetermined upper limit value is set as 95% of the output range of the sensor. However, 95% is just an example, and it may be selected from between 90 and 98%.

所定の下限値としては、当該センサの出力範囲の５％として設定される。ただし、５％は一例であり、２～１０％の間から選定されればよい。 The predetermined lower limit value is set as 5% of the output range of the sensor. However, 5% is just an example, and it may be selected from between 2 and 10%.

［変動幅／平均値の比に基づく判定］
センサの検出値の直近の所定時間（例えば２４時間特に６０ｍｉｎ程度）における検出値の変動幅すなわち（最大値－最小値）の値と、当該所定時間内における検出値の平均値との比［変動幅］／［平均値］が所定値以下、例えば２～２０％の間から選択された値以下である場合、センサがフリーズしているものと判定し、アラームを出力する。 [Judgment based on the ratio of fluctuation range/average value]
The ratio of the fluctuation width of the detected value of the sensor over the most recent predetermined time period (for example, 24 hours, especially about 60 minutes), that is, the value (maximum value - minimum value), and the average value of the detected value within the predetermined time period [variation] Width]/[Average value] is less than a predetermined value, for example, less than a value selected from 2 to 20%, it is determined that the sensor is frozen, and an alarm is output.

［流量計の異常の判定］
流量計の上流側にポンプが設けられた流量計については、流量計測値が、該ポンプの吐出量の仕様値（カタログ値）よりも大きくなった場合、流量計に異常が生じたものと判定し、アラームを出力してもよい。 [Determination of flow meter abnormality]
For flowmeters with a pump installed upstream of the flowmeter, if the measured flow value becomes larger than the specified value (catalog value) of the discharge amount of the pump, it is determined that an abnormality has occurred in the flowmeter. It is also possible to output an alarm.

１ 原水タンク
４ 保安フィルタ
６ 加圧ポンプ
２０ 圧力センサ
２１ 制御装置
２２～２５ 流量計
1 Raw water tank 4 Safety filter 6 Pressure pump 20 Pressure sensor 21 Control device 22-25 Flow meter

Claims (3)

原水を、給水ポンプ、第１配管、加圧ポンプ及び第２配管を介して第１ＲＯ装置に供給し、
該第１ＲＯ装置の透過水を第３配管を介して第２ＲＯ装置に供給し、
該第２ＲＯ装置の透過水を第４配管を介して脱気装置に供給し、
該脱気装置からの脱気処理水を第５配管を介して電気脱イオン装置に供給し、電気脱イオン処理して純水を製造する純水製造装置を制御する方法であって、
前記第１配管、第３配管及び第４配管に設けられた流量計の検出値の所定時間内における最大値と最小値の差と平均値との比が所定値以下である場合にアラームを出力する純水製造装置の制御方法。 Supplying raw water to a first RO device via a water supply pump, a first pipe, a pressure pump, and a second pipe,
Supplying the permeated water of the first RO device to the second RO device via a third pipe,
Supplying the permeated water of the second RO device to a deaerator via a fourth pipe,
A method for controlling a pure water production device that supplies degassed water from the deaeration device to an electrodeionization device via a fifth pipe, and produces pure water by performing electrodeionization treatment, the method comprising:
An alarm is output when the ratio of the difference between the maximum value and the minimum value and the average value of the detected values of the flowmeters installed in the first pipe, the third pipe, and the fourth pipe within a predetermined time is less than a predetermined value. A method for controlling a pure water production equipment. 前記所定値は、２～２０％の間から選定された値である請求項１の純水製造装置の制御方法。The method for controlling a pure water production apparatus according to claim 1, wherein the predetermined value is a value selected from between 2% and 20%. 原水を、給水ポンプ、第１配管、加圧ポンプ及び第２配管を介して第１ＲＯ装置に供給し、
該第１ＲＯ装置の透過水を第３配管を介して第２ＲＯ装置に供給し、
該第２ＲＯ装置の透過水を第４配管を介して脱気装置に供給し、
該脱気装置からの脱気処理水を第５配管を介して電気脱イオン装置に供給し、電気脱イオン処理して純水を製造する純水製造装置を制御する方法であって、
前記第１配管、第３配管及び第４配管に設けられた流量計の検出値が、該流量計よりも上流側の前記給水ポンプ又は加圧ポンプの吐出量の仕様値よりも大きくなった場合にアラームを出力することを特徴とする純水製造装置の制御方法。 Supplying raw water to a first RO device via a water supply pump, a first pipe, a pressure pump, and a second pipe,
Supplying the permeated water of the first RO device to the second RO device via a third pipe,
Supplying the permeated water of the second RO device to a deaerator via a fourth pipe,
A method for controlling a pure water production device that supplies degassed water from the deaeration device to an electrodeionization device via a fifth pipe, and produces pure water by performing electrodeionization treatment, the method comprising:
When the detected value of the flowmeters provided in the first pipe, the third pipe, and the fourth pipe becomes larger than the specified value of the discharge amount of the water supply pump or pressure pump located upstream of the flowmeter. 1. A method for controlling a pure water production device, the method comprising: outputting an alarm.
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