JP2017170332A - Chemicals feeding control method - Google Patents

Chemicals feeding control method Download PDF

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JP2017170332A
JP2017170332A JP2016058819A JP2016058819A JP2017170332A JP 2017170332 A JP2017170332 A JP 2017170332A JP 2016058819 A JP2016058819 A JP 2016058819A JP 2016058819 A JP2016058819 A JP 2016058819A JP 2017170332 A JP2017170332 A JP 2017170332A
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chemical injection
hardness
amount
upper limit
control method
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JP6724458B2 (en
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周子 進邦
Shuko Shinbo
周子 進邦
英之 小森
Hideyuki Komori
英之 小森
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Kurita Water Industries Ltd
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Abstract

【課題】薬注設備の最大薬注量を増大させることなく、リーク硬度量に応じた適切な薬注量とすることができる薬注制御方法を提供する。
【解決手段】給水の硬度を検出し、検出結果に基づいて薬注装置によって該給水にスケール防止剤を添加する薬注制御方法において、硬度検出値に応じた必要薬注量にて薬注を行う薬注制御方法であって、必要薬注量が基準薬注量超となった場合、もしくは、硬度検出値が基準硬度量超となった場合には、その後の硬度検出時における必要薬注量が前記必要薬注量を下回るようになった後も、所定時間、その後の硬度検出時における必要薬注量よりも多い薬注量にて薬注する。
【選択図】図2
Disclosed is a chemical injection control method capable of setting an appropriate chemical injection amount according to a leak hardness amount without increasing the maximum chemical injection amount of a chemical injection facility.
In a chemical injection control method in which the hardness of water supply is detected and a scale inhibitor is added to the water supply by a chemical injection device based on the detection result, chemical injection is performed at a required chemical injection amount corresponding to the hardness detection value. This is a chemical injection control method to be performed, and when the required chemical injection amount exceeds the reference chemical injection amount, or when the hardness detection value exceeds the reference hardness amount, the required chemical injection at the subsequent hardness detection is performed. Even after the amount becomes lower than the required amount, the drug is injected for a predetermined time at a dose that is larger than the required dose at the time of hardness detection.
[Selection] Figure 2

Description

本発明は、ボイラ給水等の水系においてスケール防止剤の薬注量を制御する方法に係り、特に給水の硬度を検出して薬注量を制御する方法の改良に関する。なお、本発明において、スケール防止剤は、スケール成分の分散、付着したスケールの剥離等を含めた広義の剤である。   The present invention relates to a method for controlling a chemical injection amount of a scale inhibitor in an aqueous system such as boiler feed water, and more particularly to an improvement in a method for controlling the chemical injection amount by detecting the hardness of water supply. In the present invention, the scale inhibitor is a broad agent including dispersion of scale components, peeling of attached scale, and the like.

ボイラ給水系では、図1のように、原水を軟水器1で処理して硬度成分を除去した後、ボイラ4に給水するようにしている。この軟水器からの給水中の硬度成分濃度を測定し、給水にスケール防止剤を添加する(特許文献1)。   In the boiler water supply system, as shown in FIG. 1, raw water is treated with a water softener 1 to remove hardness components, and then water is supplied to the boiler 4. The hardness component density | concentration in the water supply from this water softener is measured, and a scale inhibitor is added to water supply (patent document 1).

特開2003−329209号公報JP 2003-329209 A

軟水器1からの硬度リーク量がかなり多い場合、薬注量もそれに合わせて多くする必要があるが、薬注ポンプの薬注量には限度があり、必要薬注量が薬注ポンプの吐出能力を超えた場合には、薬注不足が発生することになる。この対策として、薬注ポンプとして容量の大きいものを設置したり、薬注ポンプを複数台設置して最大薬注量を増大させることが考えられるが、設備コストが高くなる。   When the amount of hardness leak from the water softener 1 is quite large, the amount of chemical injection needs to be increased accordingly, but there is a limit to the amount of chemical injection of the chemical injection pump, and the required amount of chemical injection is discharged from the chemical injection pump. If the capacity is exceeded, a shortage of drug injection will occur. As countermeasures, it is conceivable to install a large amount of drug injection pump or to install a plurality of drug injection pumps to increase the maximum drug injection volume, but the equipment cost becomes high.

また、最大吐出量の多い薬注ポンプは、吐出量が小さい場合の薬注量精度が低いため、硬度リークが少ない場合の薬注量精度が悪くなるという課題もある。   Moreover, since the chemical injection pump with a large maximum discharge amount has a low chemical injection amount accuracy when the discharge amount is small, there is also a problem that the chemical injection accuracy is low when the hardness leak is small.

また、一度に過度に多量の薬注を行うと、給水中で薬剤がゲル化するおそれがある。   In addition, if an excessive amount of chemical injection is performed at one time, the drug may gel in the water supply.

本発明は、薬注設備の最大薬注量を増大させることなく、リーク硬度量に応じた適切な薬注量とすることができる薬注制御方法を提供することを一つの目的とする。   An object of the present invention is to provide a chemical injection control method capable of setting an appropriate chemical injection amount according to the leak hardness amount without increasing the maximum chemical injection amount of the chemical injection facility.

第1発明の薬注制御方法は、給水の硬度を検出し、検出結果に基づいて薬注装置によって該給水にスケール防止剤を添加する薬注制御方法において、直近の所定期間における最大の硬度検出値に応じた必要薬注量にて薬注することを特徴とするものである。   The chemical injection control method of the first invention is a chemical injection control method for detecting the hardness of water supply and adding a scale inhibitor to the water supply by a chemical injection device based on the detection result. It is characterized by injecting a medicine at a necessary amount according to the value.

第2発明の薬注制御方法は、給水の硬度を検出し、検出結果に基づいて薬注装置によって該給水にスケール防止剤を添加する薬注制御方法において、硬度検出値に応じた必要薬注量にて薬注を行う薬注制御方法であって、必要薬注量が基準薬注量超となった場合、もしくは、硬度検出値が基準硬度量超となった場合には、その後の硬度検出時における必要薬注量が前記必要薬注量を下回るようになった後も、所定時間、その後の硬度検出時における必要薬注量よりも多い薬注量にて薬注することを特徴とするものである。   The chemical injection control method of the second invention is a chemical injection control method for detecting the hardness of the water supply and adding a scale inhibitor to the water supply by the chemical injection device based on the detection result. This is a chemical injection control method in which chemical injection is performed in a quantity, and if the required chemical injection quantity exceeds the reference chemical injection quantity, or the hardness detection value exceeds the standard hardness quantity, the subsequent hardness It is characterized in that, even after the required dose at the time of detection becomes lower than the required dose, the drug is injected at a dose higher than the required dose at the time of subsequent hardness detection. To do.

本発明の一態様では、硬度検出値に応じた必要薬注量が、薬注装置の最大薬注量(以下、薬注上限値という。)以上となった場合には、その後の硬度検出時における必要薬注量が前記必要薬注量を下回るようになった後も、所定時間、その後の硬度検出時における必要薬注量よりも多い薬注量にて薬注する。   In one aspect of the present invention, when the required chemical injection amount corresponding to the hardness detection value is equal to or greater than the maximum chemical injection amount (hereinafter referred to as the chemical injection upper limit value) of the chemical injection device, at the time of subsequent hardness detection Even after the required chemical injection amount becomes lower than the required chemical injection amount, the chemical injection is performed for a predetermined time and at a chemical injection amount larger than the required chemical injection amount at the time of subsequent hardness detection.

本発明の一態様では、前記所定時間における薬注量は前記薬注上限値である。   In one aspect of the present invention, the amount of drug injection in the predetermined time is the drug injection upper limit value.

本発明の一態様では、硬度の測定を間欠的に行い、硬度が測定される度毎に必要薬注量の計算を行う。   In one embodiment of the present invention, the hardness is measured intermittently, and the required dosage is calculated every time the hardness is measured.

本発明の一態様では、前記所定時間は、予め設定した略一定の時間である。   In one aspect of the invention, the predetermined time is a substantially constant time set in advance.

本発明の一態様では、前記所定時間は、直近の所定期間内の基準硬度量を超過した回数、基準硬度量以上の範囲に設けた所定硬度値を超過した回数、必要薬注量の薬注回数、薬注上限値に達した回数のいずれかを考慮して設定される。   In one aspect of the present invention, the predetermined time includes the number of times that the reference hardness amount has been exceeded within the most recent predetermined period, the number of times that the predetermined hardness value has been set in a range equal to or greater than the reference hardness amount, and the required amount of medicine to be injected. It is set in consideration of either the number of times or the number of times the drug injection upper limit has been reached.

本発明の一態様では、直近の所定期間内において、薬注上限値相当硬度を超えた硬度の合計値(S)を求めると共に、必要薬注量が薬注上限値を下回るようになった後、薬注上限値相当硬度と検出硬度との差の合計値(S)を求め、SがSを上回るようになるまで、薬注上限値にて薬注を行う。 In one aspect of the present invention, the total value (S 1 ) of the hardness exceeding the upper limit equivalent to the chemical injection upper limit value is obtained within the most recent predetermined period, and the required amount of chemical injection is less than the upper limit value of the chemical injection. Then, the total value (S 2 ) of the difference between the chemical injection upper limit equivalent hardness and the detected hardness is obtained, and chemical injection is performed at the chemical injection upper limit until S 1 exceeds S 2 .

本発明の一態様では、直近の所定期間内において、必要薬注量が薬注上限値に到達した回数nをカウントし、必要薬注量が薬注上限値を下回るようになったときから所定時間Tは薬注上限値にて薬注を行う。   In one aspect of the present invention, the number n of times when the required chemical injection amount has reached the upper limit of the chemical injection is counted within the most recent predetermined period, and the predetermined amount from when the required chemical injection amount becomes lower than the upper limit of chemical injection. During time T, the medicine is injected at the medicine injection upper limit.

本発明の一態様では、給水はボイラ給水である。   In one aspect of the present invention, the water supply is boiler water supply.

なお、本発明において、必要薬注量とは、ボイラ缶内においてスケールを防止するのに必要な薬注量であって、硬度に比例した量として設定してもよく、また、所定の硬度検出範囲毎に応じて予め設定した量としてもよい。硬度に比例させた薬注量とは、硬度検出値c(mg/L)に対して定数αを乗じたα・cとして計算する検量線による正比例方式でもよく、予め設定された検量関係による方式であってもよい。また、所定の硬度検出範囲毎に応じて予め設定するとは、例えば
硬度c未満の場合 硬度cに対応した薬注量A
硬度c〜c未満の場合 硬度cに対応した薬注量A
硬度c〜c未満の場合 硬度cに対応した薬注量A
硬度c以上の場合 原水硬度等を参照して予め設定した薬注量A
というように硬度検出値を所定の範囲毎に分けて、当該範囲に対応した薬注量を設定するなどが挙げられる。この例では、薬注量は4段階となっているが、3又は5〜10段階であってもよく、これ以上であってもよい。また、各硬度検出範囲の上限値に合わせて薬注量を設定しているが、硬度検出範囲の平均値に合わせて薬注しても良いし、硬度検出範囲のある点の硬度に合わせて薬注しても良い。さらに、硬度c以上の場合に原水硬度に合わせて薬注量を設定しているが、それ以下の硬度に合わせて薬注量を設定してもよい。
In the present invention, the required chemical injection amount is a chemical injection amount necessary for preventing scale in the boiler can, and may be set as an amount proportional to the hardness, or a predetermined hardness detection. It is good also as a quantity set up beforehand according to every range. The dosage in proportion to the hardness may be a direct proportional method using a calibration curve calculated as α · c obtained by multiplying the hardness detection value c (mg / L) by a constant α, or a method based on a preset calibration relationship. It may be. Moreover, the set in advance according to a predetermined hardness detection range, for example, chemical feeding, chemical dosing amount A 1 of the case of less than hardness c 1 corresponding to the hardness c 1
Chemical feeding, chemical dosing amount A 2 of the case of less than hardness c 1 to c 2 corresponding to the hardness c 2
Chemical feeding, chemical dosing amount A 3 that if less than the hardness c 2 to c 3 corresponding to the hardness c 3
When the hardness c is 3 or more, the dosage A 4 set in advance with reference to the raw water hardness, etc.
As described above, the hardness detection value is divided into predetermined ranges, and a chemical injection amount corresponding to the range is set. In this example, the dosage is 4 stages, but it may be 3 or 5 to 10 stages or more. In addition, the amount of medicine to be poured is set according to the upper limit value of each hardness detection range, but it may be dispensed according to the average value of the hardness detection range, or according to the hardness of a certain point in the hardness detection range. You may inject medicine. Furthermore, although setting the dosing quantity in accordance with the raw water hardness in the case of more hardness c 3, it may be set dosing amount accordingly less hardness.

本発明によると、硬度に比例させた薬注量計算値が薬注ポンプ等の薬注設備の最大薬注量などの基準薬注量を超えるようになった場合でも、その後、硬度に比例させた薬注量が基準薬注量を下回るようになった後に、しばらくは最大薬注量などの薬注量を維持する。これにより、不足していたスケール防止剤が追加薬注されるので、ボイラ等における薬注不足が解消される。   According to the present invention, even if the calculated dose value proportional to the hardness exceeds the reference dose amount such as the maximum dose amount of the drug injection equipment such as a drug injection pump, the calculated value is proportional to the hardness thereafter. After the amount of medicine injected becomes lower than the reference amount of medicine, maintain the amount of medicine delivered, such as the maximum amount of medicine for a while. Thereby, since the insufficient scale inhibitor is added, the shortage of chemical injection in a boiler or the like is solved.

なお、軟水器からの硬度リークが一時的に高くなった場合、その後硬度リークが低下したときでも、再度硬度リークが高くなることが多いので、硬度リークが一時的に高くなった場合には、その後に硬度リークが低下しても薬注量を継続して多くすることが望ましいことがある。   In addition, when the hardness leak from the water softener temporarily increases, even when the hardness leak subsequently decreases, the hardness leak often increases again, so if the hardness leak temporarily increases, It may be desirable to continue to increase the dose even if the hardness leak subsequently decreases.

本発明の一態様によると、このように硬度リークが生じた場合でも薬注量を継続して多くすることができる。   According to one aspect of the present invention, even when a hardness leak occurs in this way, it is possible to continuously increase the dosage.

ボイラ給水システムのブロック図である。It is a block diagram of a boiler water supply system. 実施の形態の説明図である。It is explanatory drawing of embodiment. 実施の形態の説明図である。It is explanatory drawing of embodiment. 実施の形態の説明図である。It is explanatory drawing of embodiment. 実施の形態の説明図である。It is explanatory drawing of embodiment. 実施の形態の説明図である。It is explanatory drawing of embodiment. 実施の形態の説明図である。It is explanatory drawing of embodiment. 比較例の説明図である。It is explanatory drawing of a comparative example.

以下、図面を参照して実施の形態ついて説明する。   Hereinafter, embodiments will be described with reference to the drawings.

図1は、イオン交換樹脂を内蔵した軟水器(軟化器)1からの給水を配管2を介して給水タンク3に導入し、該給水タンク3から複数のボイラ(例えば小型貫流ボイラ)4に供給する給水システムを示している。図1では、軟水器1からの給水中の硬度成分濃度を硬度センサ5で検出し、給水流量を流量計8で検出し、これらの検出値を制御器6に入力し、検出値に応じて薬注ポンプ7を作動させて給水タンク3への薬注量を制御する。なお、薬注箇所は給水タンク3以外であってもよい。検出器が上流であり、薬注箇所が下流の位置関係となっていれば、検出器と薬注箇所は、配管2、タンク3、タンクの後であって分岐前の配管のいずれであっても良い。   FIG. 1 shows that water supplied from a water softener (softener) 1 incorporating an ion exchange resin is introduced into a water supply tank 3 through a pipe 2 and supplied from the water supply tank 3 to a plurality of boilers (for example, small once-through boilers) 4. Shows the water supply system. In FIG. 1, the hardness component concentration in the feed water from the water softener 1 is detected by the hardness sensor 5, the feed water flow rate is detected by the flow meter 8, and these detected values are input to the controller 6, and according to the detected values. The chemical injection pump 7 is operated to control the chemical injection amount to the water supply tank 3. In addition, a chemical injection location may be other than the water supply tank 3. If the detector is upstream and the chemical injection location is downstream, the detector and chemical injection location are any of the piping 2, tank 3, and the piping after the tank and before branching. Also good.

硬度の測定は、以下の各実施の形態では5分に1回行っているが、これに限定されず、30秒〜1日に1回であれば良く、好ましくは1〜30分に1回程度行う。また、連続して硬度を測定する場合には、検出された硬度をそのまま利用してもよいし、、所定時間(好ましくは1〜30分間、例えば5分間)の平均値を硬度測定値としてもよい。   The hardness is measured once every 5 minutes in the following embodiments, but is not limited thereto, and may be once every 30 seconds to once a day, preferably once every 1 to 30 minutes. Do about. In the case of continuously measuring the hardness, the detected hardness may be used as it is, or an average value for a predetermined time (preferably 1 to 30 minutes, for example, 5 minutes) may be used as the hardness measurement value. Good.

以下の各実施の形態では、図1のボイラ給水システムにおいて、軟水器1からの給水中の硬度濃度を配管2に設けた硬度センサ5で5分に1回の頻度で検出し、この検出結果に基づいて薬注ポンプ7の吐出量を制御することにより、薬液(スケール防止剤の溶液)の添加量を制御する。なお、この実施の形態では、薬注ポンプ7の最大薬注能力は200mg/L(薬注された水中の薬剤濃度が200mg/Lとなる薬注能力)である。   In each of the following embodiments, in the boiler water supply system of FIG. 1, the hardness concentration in the water supplied from the water softener 1 is detected at a frequency of once every 5 minutes by the hardness sensor 5 provided in the pipe 2. The amount of the chemical solution (scale inhibitor solution) added is controlled by controlling the discharge amount of the chemical injection pump 7 based on the above. In this embodiment, the maximum drug injection capacity of the drug injection pump 7 is 200 mg / L (the drug injection capacity at which the drug concentration in the drug-injected water is 200 mg / L).

薬注ポンプ7は連続的に駆動されてもよく、薬注するときだけ駆動されてもよい。後者の場合、ポンプの回転数は一定としておき、駆動時間を長短調整して薬注量を制御してもよく、駆動時間とショット間隔の併用で調整してもよい。   The medicinal pump 7 may be driven continuously, or may be driven only when the medicinal product is dispensed. In the latter case, the number of rotations of the pump is kept constant, and the amount of drug injection may be controlled by adjusting the driving time to be longer or shorter, or may be adjusted by using both the driving time and the shot interval.

図2は、第1発明の制御方法を示すものであり、過去の所定時間a(この場合は30分間)の検出硬度の最大値に基づいて薬注量を決定している。薬注量は、以下の通りに設定した。
硬度1mg/L未満の場合 硬度1mg/Lに対応した薬注量2mg/L
硬度1〜3mg/L未満の場合 硬度3mg/Lに対応した薬注量10mg/L
硬度3〜5mg/L未満の場合 硬度5mg/Lに対応した薬注量25mg/L
硬度5mg/L以上の場合 原水硬度等を参照して予め設定した薬注量200mg/L
なお、必要な薬注量はスケール防止剤の種類によっても変わるが、一般的なスケール防止剤であれば硬度量に対して1倍以上入れればよく、余裕をもって設定することが好ましい。また、硬度検出値に比例するように薬注量を設定してもよい。上記時間aは10〜60分特に20〜40分の間から選択されることが好ましい。
FIG. 2 shows a control method according to the first aspect of the present invention, in which the chemical injection amount is determined based on the maximum value of the detected hardness of the past predetermined time a (in this case, 30 minutes). The dosage was set as follows.
When the hardness is less than 1 mg / L, the dosage 2 mg / L corresponding to the hardness of 1 mg / L
When the hardness is less than 1 to 3 mg / L, a dosage of 10 mg / L corresponding to a hardness of 3 mg / L
When the hardness is less than 3 to 5 mg / L, a dosage of 25 mg / L corresponding to a hardness of 5 mg / L
When the hardness is 5 mg / L or more Prescription dose 200 mg / L preset with reference to raw water hardness etc.
In addition, although a required chemical injection quantity changes also with the kind of scale inhibitor, if it is a general scale inhibitor, what is necessary is just to put 1 time or more with respect to the amount of hardness, and it is preferable to set with a margin. Moreover, you may set a chemical injection quantity so that it may be proportional to a hardness detection value. The time a is preferably selected from 10 to 60 minutes, particularly from 20 to 40 minutes.

図2において、時刻0:20以前は検出硬度濃度は0.5mg−asCaCO/L(以下、mg/Lと略)であり、基準薬注量は2mg/Lである。この硬度濃度範囲では、軟化器は正常に機能しており、不可避な硬度に対応するために定常的な薬注量が設定される(基準薬注量)。 In FIG. 2, before time 0:20, the detected hardness concentration is 0.5 mg-asCaCO 3 / L (hereinafter abbreviated as mg / L), and the reference dosage is 2 mg / L. In this hardness concentration range, the softener is functioning normally, and a steady dose is set to cope with the inevitable hardness (reference dose).

0:25の計測では、硬度検出値が1mg/Lとなり、薬注量は10mg/Lに増加される。0:30の計測では、硬度検出値は0.5mg/Lに低下したが、0:25計測時の薬注量が継続される。0:35の計測では硬度が1mg/Lであり、薬注量は10mg/Lが維持される。   In the measurement at 0:25, the hardness detection value is 1 mg / L, and the dosage is increased to 10 mg / L. In the measurement at 0:30, the hardness detection value decreased to 0.5 mg / L, but the dose of the drug at the time of 0:25 measurement is continued. In the measurement at 0:35, the hardness is 1 mg / L, and the dosage is maintained at 10 mg / L.

0:40の計測では、硬度が2mg/Lとなったので、薬注量は25mg/Lに増加される。0:45の計測では、硬度が5mg/L以上となったので、薬注量は200mg/Lに増加される。硬度は、0:50、0:55の計測でも5mg/L以上であり、200mg/Lの薬注が維持される。   In the measurement at 0:40, since the hardness is 2 mg / L, the dosage is increased to 25 mg / L. In the measurement at 0:45, since the hardness is 5 mg / L or more, the dosage is increased to 200 mg / L. Hardness is 5 mg / L or more even when measured at 0:50 and 0:55, and 200 mg / L of chemical injection is maintained.

1:00〜1:20の計測では、硬度は2mg/L〜0.5mg/Lに低下しているが、前30分の最大硬度に基づく薬注量200mg/Lが維持される。1:25の計測では、硬度が5mg/L以上となったので、薬注量は200mg/Lとされる。その後、30分間は硬度が0.5mg/Lと低いが、200mg/Lの薬注量が維持される。   In the measurement of 1:00 to 1:20, the hardness is reduced to 2 mg / L to 0.5 mg / L, but the dosage of 200 mg / L based on the maximum hardness of 30 minutes before is maintained. In the measurement of 1:25, since the hardness was 5 mg / L or more, the dosage is 200 mg / L. Thereafter, the hardness is as low as 0.5 mg / L for 30 minutes, but the dose of 200 mg / L is maintained.

1:55の計測(0.5mg/L)後に薬注量は2mg/Lにまで低下される。その後、2:10の計測(2mg/L)に対応して薬注量は25mg/Lに増加し、2:40の計測により、2:15計測時の硬度1mg/L対応値(10mg/L)とされ、2:45の計測により2mg/Lに低下される。   After a measurement of 1:55 (0.5 mg / L), the dosage is reduced to 2 mg / L. Thereafter, the dosage is increased to 25 mg / L corresponding to the measurement of 2:10 (2 mg / L), and the hardness corresponding to 1 mg / L at the measurement of 2:15 (10 mg / L) is measured by the measurement of 2:40. And reduced to 2 mg / L by 2:45 measurement.

このように、過去30分間の最高硬度値に従った薬注量とすることにより、薬注不足が防止される。即ち、リーク硬度が低下した後もなお暫くは薬注量を上限値薬注量とし、スケール防止剤を追加薬注することにより、ボイラ4のスケール障害を防止することができる。また、常に高濃度薬注するのではなく、低硬度が続く場合には薬注量を少なくするから、薬剤コストが過大とならない。   Thus, the shortage of chemical injection is prevented by setting the chemical injection amount according to the maximum hardness value in the past 30 minutes. That is, the scale failure of the boiler 4 can be prevented by setting the chemical injection amount as the upper limit chemical injection amount for a while after the leak hardness is reduced and additionally adding the scale inhibitor. In addition, the drug cost is not excessive because the drug dose is reduced when the low hardness continues instead of always dispensing the drug at a high concentration.

図8は薬注量を硬度検出値に正比例させた薬注制御例(比較例)を示すものである。図8と図2とを対比することにより、図2では、硬度リークが増加したときの薬注量がその後暫く多くなることが明瞭である。   FIG. 8 shows a chemical injection control example (comparative example) in which the chemical injection amount is directly proportional to the hardness detection value. By comparing FIG. 8 with FIG. 2, it is clear that in FIG. 2, the amount of chemical injection when the hardness leak increases increases for a while after that.

図3〜7は、それぞれ第2発明の実施の形態を示すものであり、薬注量を硬度検出値に応じて制御した場合において、必要薬注量がポンプ上限値に到達することがあるケースの薬注制御方法の一例を示している。   FIGS. 3 to 7 each show an embodiment of the second invention, and the case where the required chemical injection amount may reach the pump upper limit value when the chemical injection amount is controlled according to the hardness detection value. 1 shows an example of a drug injection control method.

図3の制御方法では、過去a分(図3ではa=30分)の間に必要薬注量がポンプ上限値に到達した回数をカウントし、このカウント値に応じて、必要薬注量がポンプ上限値を下回った時点から所定時間、ポンプ上限値での薬注を継続する。   In the control method of FIG. 3, the number of times that the required chemical injection amount has reached the pump upper limit during the past a minutes (a = 30 minutes in FIG. 3) is counted, and the required chemical injection amount is determined according to this count value. Continue to inject the drug at the pump upper limit for a predetermined time from when the pump upper limit is exceeded.

図3では、0:45よりも前では必要薬注量がポンプ上限値未満であるが、0:45、0:50及び0:55の3回の計測ではそれぞれポンプ上限値に到達している。1:00では、必要薬注量はポンプ上限値を下回っている。図3では、1:00以降においても所定時間bだけポンプ上限値到達を維持する。この所定時間bは、1:00前30分の間に必要薬注量がポンプ上限値に到達した回数N(MAX到達回数。この場合はN=3)に比例した時間である。即ちb=β・Nであり、βは比例定数である。図3では、b=5×3=15分である。図3では、1:00を過ぎても、1:15までは薬注量はポンプ上限値とされる。   In FIG. 3, the necessary chemical injection amount is less than the pump upper limit before 0:45, but the pump upper limit is reached in three measurements of 0:45, 0:50, and 0:55, respectively. . At 1:00, the required dose is below the pump upper limit. In FIG. 3, the pump upper limit is reached for a predetermined time b even after 1:00. The predetermined time b is a time proportional to the number of times N (the number of times MAX has reached, in this case N = 3) that the required amount of medicine has reached the pump upper limit value within 30 minutes before 1:00. That is, b = β · N, and β is a proportionality constant. In FIG. 3, b = 5 × 3 = 15 minutes. In FIG. 3, even if it passes through 1:00, the amount of chemical injection is set to the pump upper limit until 1:15.

1:15計測後は、薬注量を基準薬注量としている。   After 1:15 measurement, the dosage is set as the reference dosage.

1:25の計測結果では、再び必要薬注量がポンプ上限値に到達している。この場合、1:30の計測硬度値は低く、必要薬注量はポンプ上限値よりも低くなるが、MAX到達回数N=1であるので、1:30になっても所定時間cだけポンプ上限値での薬注を継続する。この場合の所定時間cは、c=β・N=5×1=5分である。   In the measurement result of 1:25, the necessary chemical injection amount has reached the pump upper limit again. In this case, the measured hardness value of 1:30 is low and the required chemical injection amount is lower than the pump upper limit value. However, since the number of times N reaches N = 1, even if 1:30, the pump upper limit is set for a predetermined time c. Continue dosing by value. The predetermined time c in this case is c = β · N = 5 × 1 = 5 minutes.

図4は、薬注量を過去a分(図4ではa=30分)間の検出硬度合計値(積算値)に比例させるように計算すると共に、必要薬注量がポンプ上限値を超えたときには、必要薬注量がポンプ上限値を超えている期間内の超過硬度を積算し、この超過硬度が相殺されるまで薬注量をポンプ上限値のままとする制御方法である。   FIG. 4 calculates the chemical injection amount so as to be proportional to the detected hardness total value (integrated value) during the past a minutes (a = 30 minutes in FIG. 4), and the required chemical injection amount exceeded the pump upper limit value. In some cases, this is a control method in which the excess hardness within a period in which the required chemical injection amount exceeds the pump upper limit value is integrated, and the chemical injection amount remains at the pump upper limit value until this excess hardness is offset.

図4では、過去30分の硬度合計量が10mg/Lであるときの薬注量が200mg/L(ポンプ上限値)であるので、10mg/Lが薬注上限値相当硬度である。超過硬度とは、過去30分の硬度合計量のうち、この薬注上限値相当硬度(10mg/L)を超える分である。   In FIG. 4, since the chemical injection amount is 200 mg / L (pump upper limit value) when the total hardness amount for the past 30 minutes is 10 mg / L, 10 mg / L is the chemical injection upper limit equivalent hardness. Excess hardness is the amount exceeding the chemical injection upper limit equivalent hardness (10 mg / L) in the total hardness for the past 30 minutes.

図4では、0:10〜0:40の間は、過去30分間の合計硬度は10mg/Lよりも少なく、薬注量はそれに比例している。0:45の計測により、過去30分間の合計硬度は10mg/Lに到達し、それ以降1:20の計測結果まで、過去30分間の合計硬度は、10mg/L超となっている。この間は、ポンプ薬注量は上限値200mg/Lに維持される。   In FIG. 4, between 0:10 and 0:40, the total hardness for the past 30 minutes is less than 10 mg / L, and the dosage is proportional to it. By the measurement of 0:45, the total hardness for the past 30 minutes reaches 10 mg / L, and thereafter, until the measurement result of 1:20, the total hardness for the past 30 minutes is over 10 mg / L. During this period, the pump dosage is maintained at the upper limit of 200 mg / L.

0:50〜1:20の間の10mg/L超の合計硬度の積算値Sが1:20以降において相殺されるまで、即ち、過去30分間の合計硬度に比例させた計算薬注量と薬注上限値相当硬度(この場合、合計硬度10mg/L)との差の積算値Sが、S以上となる時刻(図4では2:15計測時)まで、薬注量はポンプ上限値200mg/Lに維持される。 The calculated dose amount until the integrated value S 1 of the total hardness exceeding 10 mg / L between 0:50 and 1:20 is offset after 1:20, that is, proportional to the total hardness for the past 30 minutes (in this case, total hardness 10 mg / L) dosing upper limit equivalent hardness integrated value S 2 of the difference between the up S 1 or more to become the time (in FIG. 4 2:15 during measurement), Kusurichuryou pump limit The value is maintained at 200 mg / L.

従って、図4では、過去30分間の合計硬度が10mg/L超となっている期間dだけでなく、その後の期間eも薬注量=200mg/Lとされている。即ち、図4の期間eにおける5分毎の硬度合計値(過去30分間合計値)と10mg/Lとの差の積算値がSである。 Therefore, in FIG. 4, not only the period d in which the total hardness for the past 30 minutes has exceeded 10 mg / L, but also the subsequent period e is set to 200 mg / L. That is, the integrated value of the difference between the hardness total value of every 5 minutes in the period e in FIG. 4 (total last 30 minutes) and 10 mg / L is S 2.

2:15になると、SがSを上回るので、2:20以降は、過去30分間の合計硬度に比例した薬注量になる。 When becomes 2:15, the S 2 exceeds S 1, 2: 20 and later will chemical feeding, chemical dosing amount that is proportional to the total hardness of the past 30 minutes.

このように、硬度が薬注上限値相当硬度(10mg/L)を超えてリークした場合には、リーク硬度が低下した後もなお暫くは薬注量を上限値薬注量とし、スケール防止剤を追加薬注することにより、ボイラ4のスケール障害を防止することができる。   Thus, when the hardness exceeds the upper limit equivalent to the chemical injection value (10 mg / L) and leaks, the amount of chemical injection is set to the upper limit chemical injection amount for a while after the leak hardness decreases, and the scale inhibitor It is possible to prevent the scale failure of the boiler 4 by adding the additional medicine.

図5〜7は、硬度に比例させて薬注する場合において、必要薬注量がポンプ上限値を上回った場合、必要薬注量がポンプ上限値以下となっても、ポンプ上限値による薬注を所定時間行う制御を示している。   FIGS. 5 to 7 show that in the case of dispensing in proportion to the hardness, when the required dosage exceeds the upper limit of the pump, even if the required dosage is less than or equal to the upper limit of the pump, The control which performs is performed for a predetermined time is shown.

具体的には、必要薬注量がポンプ上限値に到達した場合の連続到達回数をnとした場合、必要薬注量がポンプ上限値を下回った後も、f・kの時間は、薬注量をポンプ上限値に維持する。もしくは、f×n倍するように設定してもよいし、f+αとしてあり、f+β×nとするように設定しても良い。 Specifically, when the required number of continuous injections when the required amount of drug injection reaches the pump upper limit value is n , even after the required drug injection amount falls below the pump upper limit value, the time of f · kn Maintain the pumping volume at the pump upper limit. Alternatively, it may be set to be multiplied by f × n, or may be set to f + α, and may be set to be f + β × n.

kは2が好ましく、fは5〜60分が好ましい。図5〜7ではk=2であり、比例定数f=5分である。   k is preferably 2, and f is preferably 5 to 60 minutes. 5-7, k = 2 and the proportionality constant f = 5 minutes.

図5では、0:45の計測結果だけ、必要薬注量がポンプ上限値(200mg/L)に到達しており、n=1である。従って、必要薬注量がポンプ上限値を下回った0:50計測後でもf・2=5×2=10分だけ、ポンプ上限値にて薬注が行われる。 In FIG. 5, only the measurement result of 0:45, the required chemical injection amount has reached the pump upper limit (200 mg / L), and n = 1. Therefore, even after 0:50 measurement when the required chemical injection amount falls below the pump upper limit value, the chemical injection is performed at the pump upper limit value for f · 2 1 = 5 × 2 = 10 minutes.

図6では、0:45及び0:50と2回続けてポンプ上限値に到達したので、n=2である。従って、必要薬注量がポンプ上限値を下回った0:55計測後、f・2=5×4=20分間にわたって薬注量をポンプ上限値に維持している。 In FIG. 6, since the pump upper limit value was reached twice at 0:45 and 0:50, n = 2. Therefore, after 0:55 measurement when the required chemical injection amount falls below the pump upper limit value, the chemical injection amount is maintained at the pump upper limit value for f · 2 2 = 5 × 4 = 20 minutes.

図7では、必要薬注量が連続して3回(0:45、0:50、0:55)ポンプ上限値に到達したので、n=3である。従って、1:00の計測後、f・2=5×8=40分間にわたって薬注量をポンプ上限値としている。 In FIG. 7, since the required chemical injection amount has reached the pump upper limit value three times in succession (0:45, 0:50, 0:55), n = 3. Therefore, after the measurement at 1:00, the injection amount is set to the pump upper limit value for f · 2 3 = 5 × 8 = 40 minutes.

上記実施の形態は、本発明の一例であり、本発明は上記以外の形態とされてもよい。薬注量を継続する際には、一律所定時間だけ継続することもできる。   The above embodiment is an example of the present invention, and the present invention may be other than the above. When the dosage is continued, it can be continued for a predetermined time.

1 軟水器
3 タンク
4 ボイラ
5 硬度センサ
7 薬注ポンプ
1 Water Softener 3 Tank 4 Boiler 5 Hardness Sensor 7 Chemical Injection Pump

Claims (12)

給水の硬度を検出し、検出結果に基づいて薬注装置によって該給水にスケール防止剤を添加する薬注制御方法において、
直近の所定期間における最大の硬度検出値に応じた必要薬注量にて薬注することを特徴とする薬注制御方法。
In the chemical injection control method of detecting the hardness of the water supply and adding a scale inhibitor to the water supply by the chemical injection device based on the detection result,
A chemical injection control method, characterized in that chemical injection is performed at a required chemical injection amount corresponding to the maximum hardness detection value in the latest predetermined period.
給水の硬度を検出し、検出結果に基づいて薬注装置によって該給水にスケール防止剤を添加する薬注制御方法において、
硬度検出値に応じた必要薬注量にて薬注を行う薬注制御方法であって、
必要薬注量が基準薬注量超となった場合、もしくは、硬度検出値が基準硬度量超となった場合には、その後の硬度検出時における必要薬注量が前記必要薬注量を下回るようになった後も、所定時間、その後の硬度検出時における必要薬注量よりも多い薬注量にて薬注することを特徴とする薬注制御方法。
In the chemical injection control method of detecting the hardness of the water supply and adding a scale inhibitor to the water supply by the chemical injection device based on the detection result,
A chemical injection control method for performing chemical injection with a required chemical injection amount corresponding to a hardness detection value,
When the required chemical injection amount exceeds the reference chemical injection amount, or when the hardness detection value exceeds the reference hardness amount, the required chemical injection amount at the time of subsequent hardness detection is lower than the required chemical injection amount. A chemical injection control method characterized in that a chemical injection is carried out at a chemical injection amount larger than a required chemical injection amount at the time of subsequent hardness detection even after it has become.
請求項2において、硬度検出値に応じた必要薬注量が、薬注装置の最大薬注量(以下、薬注上限値という。)以上となった場合には、その後の硬度検出時における必要薬注量が前記必要薬注量を下回るようになった後も、所定時間、その後の硬度検出時における必要薬注量よりも多い薬注量にて薬注することを特徴とする薬注制御方法。   In Claim 2, when the required chemical injection amount according to the hardness detection value is equal to or greater than the maximum chemical injection amount of the chemical injection device (hereinafter referred to as the chemical injection upper limit value), it is necessary for subsequent hardness detection. A chemical injection control characterized in that, even after the chemical injection amount becomes lower than the required chemical injection amount, the chemical injection is performed for a predetermined time and at a chemical injection amount larger than the required chemical injection amount at the time of subsequent hardness detection. Method. 請求項2又は3において、前記所定時間における薬注量は前記薬注上限値であることを特徴とする薬注制御方法。   4. The chemical injection control method according to claim 2, wherein the chemical injection amount in the predetermined time is the chemical injection upper limit value. 請求項2ないし4において、硬度の測定を間欠的にて行い、硬度が測定される度毎に必要薬注量の計算を行うことを特徴とする薬注制御方法。   5. The chemical injection control method according to claim 2, wherein the hardness is measured intermittently and the required chemical injection amount is calculated every time the hardness is measured. 請求項2ないし5のいずれか1項において、前記所定時間は、予め設定した略一定の時間であることを特徴とする薬注制御方法。   6. The medicine injection control method according to claim 2, wherein the predetermined time is a substantially constant time set in advance. 請求項2ないし5において、前記所定時間は、直近の所定期間内の基準硬度量を超過した回数、基準硬度量以上の範囲に設けた所定硬度値を超過した回数、必要薬注量の薬注回数、薬注上限値に達した回数のいずれかを考慮して設定されることを特徴とする薬注制御方法。   6. The predetermined time period according to claim 2, wherein the predetermined time includes the number of times that the reference hardness amount has been exceeded within the most recent predetermined period, the number of times that the predetermined hardness value provided in a range equal to or greater than the reference hardness amount has been exceeded, The chemical injection control method is set in consideration of either the number of times or the number of times the chemical injection upper limit is reached. 請求項2ないし5において、
直近の所定期間内において、薬注上限値相当硬度を超えた硬度の合計値(S)を求めると共に、必要薬注量が薬注上限値を下回るようになった後、薬注上限値相当硬度と検出硬度との差の合計値(S)を求め、
がSを上回るようになるまで、薬注上限値にて薬注を行うことを特徴とする薬注制御方法。
In claims 2 to 5,
Within the most recent predetermined period, the total value (S 1 ) of the hardness exceeding the upper limit equivalent to the chemical injection upper limit is obtained, and after the required amount of chemical injection falls below the upper limit of the chemical injection, Find the total value (S 2 ) of the difference between the hardness and the detected hardness,
A chemical injection control method, wherein chemical injection is performed at a chemical injection upper limit value until S 1 exceeds S 2 .
請求項2ないし5において、直近の所定期間内において、必要薬注量が薬注上限値に到達した回数nをカウントし、必要薬注量が薬注上限値を下回るようになったときから所定時間Tは薬注上限値にて薬注を行うことを特徴とする薬注制御方法。   In Claim 2 thru | or 5, it counts the frequency | count n that the required chemical injection amount reached | attained the chemical injection upper limit value within the latest predetermined period, and is predetermined from the time when the required chemical injection amount becomes lower than the chemical injection upper limit value. The chemical injection control method characterized in that the chemical injection is performed at time T for the chemical injection upper limit value. 請求項1ないし9のいずれか1項において、給水はボイラ給水であることを特徴とする薬注制御方法。   10. The chemical injection control method according to claim 1, wherein the water supply is boiler water supply. 上記方法を行うためのプログラム。   A program for performing the above method. 上記プログラムを備える薬注制御装置。   A chemical injection control apparatus comprising the above program.
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