JPS58143878A - Method of controlling injection of chemical - Google Patents
Method of controlling injection of chemicalInfo
- Publication number
- JPS58143878A JPS58143878A JP2612882A JP2612882A JPS58143878A JP S58143878 A JPS58143878 A JP S58143878A JP 2612882 A JP2612882 A JP 2612882A JP 2612882 A JP2612882 A JP 2612882A JP S58143878 A JPS58143878 A JP S58143878A
- Authority
- JP
- Japan
- Prior art keywords
- chemicals
- injection
- point
- calculation
- feed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Non-Electrical Variables (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、水処理栴設の薬品注入制御装置に係り、特に
薬品注入前後の水質を測定して注入量を計算する演舞装
置を備えた制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chemical injection control device for water treatment facilities, and more particularly to a control method equipped with a performance device that measures the water quality before and after chemical injection and calculates the injection amount.
従来の水処理施設の薬品注入制御の一実施例全糖1図に
示す。注入量を計算す6fJ算装置1は、水質計5の測
定イ…より計算を行なうフィードフォワード部2と、水
質計7の測定値より計算を行なうフィードバック部3か
らなり、これらを加えて流用・計6の測定値を乗じて注
入量を求め、注入機4に指令を出す。このような施設に
おいて、通常は薬品注入地点(4の地点)から水質測定
地点(7の地点)寸でにはある程を畠の時間遅れがあ6
゜このtめ、7によ/)d相定11自がある目イ尭イ1
自VC達していなかった場合、フィードバックを行なう
が、今測定した水自体の水質を変化させろことはできな
い。従ってフィードバック部3の佃t゛1はぼ0になる
ようVCフィードフォワード部2の精度ケよくしなけれ
ばならない。しかしながら、通常フィードフォワード部
2の計藷一式は固定であるため、気温、天1次、季節、
長年にわた/)慶水の水質の変化等に対応することがで
きない。また、対応策としてフィードフォワ−ド部2の
計算式のパラメータヲ変更させる場合でも、操作員の勘
で行なわれ−Cいるために、人手がかかり、かつ梢11
tもあまりよくないという欠点があった。An example of conventional chemical injection control in a water treatment facility is shown in Figure 1. The 6fJ calculation device 1 that calculates the injection amount consists of a feedforward section 2 that performs calculations based on the measurement values of the water quality meter 5, and a feedback section 3 that performs calculations based on the measured values of the water quality meter 7. The injection amount is determined by multiplying the total 6 measured values, and a command is issued to the injection machine 4. In such facilities, there is usually a certain amount of time delay between the chemical injection point (point 4) and the water quality measurement point (point 7).
゜This t is 7/) d phase constant 11 is the eye I 1
If the own VC has not been reached, feedback is provided, but the quality of the water itself that has just been measured cannot be changed. Therefore, the accuracy of the VC feedforward section 2 must be improved so that the t1 of the feedback section 3 becomes approximately 0. However, since the set of instruments in the feedforward unit 2 is usually fixed, temperature, celestial temperature, season, etc.
Over the years, we have been unable to respond to changes in Keisui's water quality. Furthermore, even when changing the parameters of the calculation formula of the feedforward unit 2 as a countermeasure, this is done based on the intuition of the operator, which requires a lot of manpower and
There was also a drawback that t was not very good.
本発明の目的は、季節や長期的な水廚の変化に対応でき
る鞘変の高いフィードフォワード制仰機Uヒ全備えた薬
品注入制御方法を提供することにある。An object of the present invention is to provide a chemical injection control method that is equipped with a feedforward suppressor U that has a high sheath change and can respond to seasonal and long-term water changes.
本発明ではこの目的ケ達1゛るために、フィ −ドフォ
ワード部による演算結果、実際の注入率、及びフィード
バック部による演p結果の3つのデータより、フィード
フォワード部のモデル式に対してフィードバック全行な
う演算装置を設け、常に犬除の永別に通したイ参i1E
されたモデル式でフィードフォワード制御を行l15.
。In order to achieve this objective 1, the present invention provides feedback to the model equation of the feedforward section based on three types of data: the calculation result of the feedforward section, the actual injection rate, and the calculation result of the feedback section. Isan i1E was equipped with a calculation device that performs all operations, and was constantly passed through the Eibetsu of dog removal.
Feedforward control is performed using the model formula shown in line l15.
.
以ド、本発明の一実施例を第2図によって説明する。第
2図は8g1図の従来の楽品注入制(財)装置の演算装
置lに、フィードフォワードモデル式修正部lO?設け
たものである。次に各演箕部について説1明する。捷す
、フィードフォワード部2は各測定頭X++1=1〜n
)jり注入率Yを求V〕るものであり、次式で衣わされ
る。Hereinafter, one embodiment of the present invention will be described with reference to FIG. Figure 2 shows the feed forward model equation correction unit lO? It was established. Next, we will explain each theater section. The feedforward section 2 separates each measuring head X++1=1 to n
)j to find the injection rate Y, which is given by the following equation.
Y二1’ fXI 、 xt 、・・・Xfi)
(1’)オは一般的な意味での関数を示
す。ここではさらに具体的な例としてn=2で、fが線
形であるとする。すなわち、
Y”” a +X、+ +a2X2 +a、 ””
(2)a、1i=l〜3)、パラメータ
1だ、フィードバンク部3は同様に測定頭Z+(1−1
〜1n )から注入率−差ΔYを求ぬるもので次式で表
わされる。Y21' fXI, xt,...Xfi)
(1') O indicates a function in a general sense. Here, as a more specific example, it is assumed that n=2 and f is linear. That is, Y"" a +X, + +a2X2 +a, ""
(2)a, 1i=l~3), parameter 1, feed bank section 3 similarly measures the measurement head Z+(1-1
~1n) to find the injection rate-difference ΔY, which is expressed by the following equation.
ΔY=g fZ+ 、Zt 、 ・ Z、)
(3)g−関数
ここでやはり具体例としてm = 1とし、gを次のよ
うな関数とする。ΔY=g fZ+ , Zt , ・Z,)
(3) g-function Here, as a concrete example, let m = 1 and let g be the following function.
ΔY = b −Z
(4)b : 1i11]ボ11白Zの目標価寸な、ト
ータル注入率をYとする。ΔY = b −Z
(4) b: 1i11] Let Y be the total injection rate that is the target price of Bo11 white Z.
△
Y=Y+ΔY(5)
次に、測定頭Zを4′fc時刻をtとすると、そのl1
llI駕した水に注入した薬品の注入率けYlt−α)
となる。但しαは注入地点(4の地点)から測定点(7
の地点)までの時間遅れを示す。また、その注入率の計
貢に用いた測定頭XIはXI (を−γ)となる。γは
測定点(5の地点)から測定点(7の地点)までの時間
遅れである。これらをまとめると次のようになる。・
Y (L −(1)=a1X11 t−’r )+a2
X2 (t r )+as(6)
/\
Yft−α)−”l’(t−α)+Δy(を−α)(7
)ffiわち、水質がXI (t−r)、 Xt (
f、−r )テ△
あった水にY(t−α)たけ薬品を注入した結束侍られ
た水の水′紹の目標帥との差は、b−z(t)となる。△Y=Y+ΔY(5) Next, if the measurement head Z is 4'fc time is t, then l1
Injection rate of chemicals injected into water (Ylt-α)
becomes. However, α is the distance from the injection point (point 4) to the measurement point (point 7).
indicates the time delay to the point). In addition, the measurement head XI used to calculate the injection rate is XI (-γ). γ is the time delay from the measurement point (point 5) to the measurement point (point 7). These can be summarized as follows.・Y (L - (1) = a1X11 t-'r) + a2
X2 (t r )+as(6) /\Yft-α)-"l'(t-α)+Δy(-α)(7
)ffi, that is, the water quality is XI (t-r), Xt (
f, -r) te△ The difference between the water that was bound and the water that was filled with Y(t-α) amount of chemicals and the target amount of water is b-z(t).
ここで、式(2)のパラメータa、(n=1〜3)の内
、季節や長期的水質の変化ケ含むJlがa2であるとす
ると、今の1回のループでa、を修正するならば次のよ
うになる。Here, if Jl, which includes seasonal and long-term water quality changes, is a2 among the parameters a and (n = 1 to 3) in equation (2), then a is corrected in the current one loop. Then it becomes as follows.
82′=[Y(t−a)+(b−Zt)l−(alXI
ft−r)+a、lンX2(t−r)(8)
つ甘り最初からa2がa!であったならば今回のループ
VCおいてフィードバック@け0となり、かつ最紺目伸
(1Gと一欽するというf1盲a【を求めるのである。82'=[Y(t-a)+(b-Zt)l-(alXI
ft-r)+a, lnX2(t-r) (8) A2 is a from the beginning! If so, in this loop VC, feedback @ ke 0 and f1 blind a[ which is the same as the most dark blue (1G) is sought.
さらに、ある周期Tにおいてこれらの修IE個の平均を
とる。すなわち、
X2(t r) (9)
となり、これがフィードフォワードモデル式修正部10
の中の計偉式となる。以上のような方法で制御を竹なつ
と、周期1゛毎にパラメータa2 が自動的に修rEさ
れ、より適したモデル式でフィードフォワード制御を行
なうことができる。Furthermore, in a certain period T, the average of these modified IEs is taken. In other words, X2(t r) (9) This becomes
It becomes a ceremony in the middle of the day. When the control is carried out in the manner described above, the parameter a2 is automatically modified every cycle, and feedforward control can be performed using a more suitable model formula.
本発明によれは、季節や長期的な水質の変化に対応した
より精度の制い制御が行なえるので、処f!lI後の水
質が安定するとともに、薬品Ir、七°効に使用できる
。また、操作員がパラメータを修正する心安がない点で
、操作性が向上した。According to the present invention, more precise control can be performed in response to seasonal and long-term changes in water quality, so it is possible to control the water quality more accurately. The water quality after Ir is stabilized, and it can be used as a chemical Ir. In addition, operability has been improved because the operator does not have to worry about modifying parameters.
第1図は、従来の薬品注入制御ブロック図であり、第2
図は、本発明の一実施例の制御ブロック図である。FIG. 1 is a conventional chemical injection control block diagram.
The figure is a control block diagram of one embodiment of the present invention.
Claims (1)
、これらの測定110僅にit1′簀モテルに従って薬
品を注入する注入機からなる水処理施設において、薬品
注入前後の水′凶夾迎]11自により該計算モデルを修
正することを特許とする楽品注入制釧j方法、。1. In a water treatment facility consisting of a side device for measuring water quality before and after chemical injection, and an injection machine for injecting chemicals according to these measurements, water quality before and after chemical injection is measured. 11. A music injection system patented method for modifying the calculation model by 11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2612882A JPS58143878A (en) | 1982-02-22 | 1982-02-22 | Method of controlling injection of chemical |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2612882A JPS58143878A (en) | 1982-02-22 | 1982-02-22 | Method of controlling injection of chemical |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58143878A true JPS58143878A (en) | 1983-08-26 |
Family
ID=12184920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2612882A Pending JPS58143878A (en) | 1982-02-22 | 1982-02-22 | Method of controlling injection of chemical |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58143878A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01270997A (en) * | 1988-04-21 | 1989-10-30 | Shimizu Corp | Process and apparatus for anaerobic fermentation |
JP2013094686A (en) * | 2011-10-28 | 2013-05-20 | Meidensha Corp | Chemical injection control method and chemical injection controller |
-
1982
- 1982-02-22 JP JP2612882A patent/JPS58143878A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01270997A (en) * | 1988-04-21 | 1989-10-30 | Shimizu Corp | Process and apparatus for anaerobic fermentation |
JP2013094686A (en) * | 2011-10-28 | 2013-05-20 | Meidensha Corp | Chemical injection control method and chemical injection controller |
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