JP2592965B2 - Chlorine injection control device - Google Patents
Chlorine injection control deviceInfo
- Publication number
- JP2592965B2 JP2592965B2 JP27601689A JP27601689A JP2592965B2 JP 2592965 B2 JP2592965 B2 JP 2592965B2 JP 27601689 A JP27601689 A JP 27601689A JP 27601689 A JP27601689 A JP 27601689A JP 2592965 B2 JP2592965 B2 JP 2592965B2
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- JP
- Japan
- Prior art keywords
- solar radiation
- chlorine
- correction
- value
- amount
- 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.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は浄水場等において用いられる塩素注入制御装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a chlorine injection control device used in a water purification plant or the like.
（従来の技術） 浄水場等においては、塩素注入制御装置によって塩素
の注入量を制御し処理水の残留塩素量が目標値になるよ
うにしている。(Prior Art) In a water purification plant or the like, the chlorine injection amount is controlled by a chlorine injection control device so that the residual chlorine amount of treated water becomes a target value.
第４図はこのような塩素注入制御装置を用いた浄水場
システムの一例を示す図である。FIG. 4 is a diagram showing an example of a water purification plant system using such a chlorine injection control device.
この図に示す浄水場システムは原水を処理する浄水場
設備120と、この浄水場設備120の塩素注入量を制御する
塩素注入制御装置121とを備えている。The water purification plant system shown in this figure includes a water purification plant 120 for treating raw water, and a chlorine injection control device 121 for controlling the chlorine injection amount of the water purification plant 120.
そして、浄水場設備120においては、取水口から取り
込まれた原水が着水井101に流入し、この着水井101の出
口で塩素注入装置から消毒のための塩素と、アルカリ注
入装置（図示は省略する）からPH調整用のアルカリ剤が
注入される。更に、凝集剤注入装置（図示は省略する）
から凝集剤の注入を受けた後、急速混和池102にてフラ
ッシュミキサー103により急激に撹拌される。この後、
フロック形成池104でゆっくり撹拌されてフロックが形
成され、沈澱池105にて大部分のフロックが沈澱除去さ
れる。Then, in the water purification plant equipment 120, the raw water taken in from the intake port flows into the landing well 101, and at the exit of the landing well 101, chlorine for disinfection from the chlorine injection device and an alkali injection device (not shown) ), An alkaline agent for adjusting pH is injected. Furthermore, a coagulant injection device (not shown)
, The mixture is rapidly stirred by the flash mixer 103 in the rapid mixing pond 102. After this,
The floc is slowly stirred in the floc formation basin 104 to form flocs, and most of the flocs are precipitated and removed in the sedimentation basin 105.
このように浄水場設備120においては、原水に塩素を
注入することにより、原水中に含まれている無機物、有
機物および病原体を含む微生物と、塩素とを反応させて
無機物等を分解させ、これによって衛生的で安全な水を
生成する。Thus, in the water purification plant equipment 120, by injecting chlorine into the raw water, the microorganisms including the inorganic substances, organic substances and pathogens contained in the raw water react with the chlorine to decompose the inorganic substances and the like, thereby Produces sanitary and safe water.
また、塩素注入制御装置121は前記沈澱池105内に処理
水が長く滞留し、これによって沈澱池105を処理水が通
過する間に、日光の照射によって処理水中の残留塩素が
分解されたり、一部が飛散したりするのを補償する装置
であり、次に述べるように動作する。Further, the chlorine injection control device 121 causes the treated water to stay for a long time in the sedimentation basin 105, whereby while the treated water passes through the sedimentation basin 105, the residual chlorine in the treated water is decomposed by the irradiation of sunlight, This is a device for compensating for the scattering of the unit, and operates as described below.
まず、日射量予測部106により、予め設定されている
日の出から日没までの各時刻毎にその時刻より所定時間
ｈ以前にて時刻毎の予測日射量RETを求めこれを日射量
修正部107に供給する。First, the solar radiation amount predicting unit 106 obtains a predicted solar radiation amount RET for each time before a predetermined time h from each time from sunrise to sunset, which is set in advance, and sends it to the solar radiation amount correcting unit 107. Supply.
日射量修正部107は前記日射量予測部106によって現在
時刻より所定時間ｈ以前に求められた現在の予測日射量
RET-hと、前記浄水場設備120に設けられた日射量計117
の出力（現在時刻における日射量実測値RPV）との偏差
を求め、この偏差に基づいて前記日射量予測部106から
出力されるｈ時間以後の予測日射量RETを補正して日射
量修正値RTを求め、これを残留塩素分解量演算部108と
操作量修正値演算部110とに供給する。The solar radiation amount correcting unit 107 is a current predicted solar radiation amount obtained by the solar radiation amount predicting unit 106 before a predetermined time h from the current time.
R ET-h and a solar radiation meter 117 provided in the water purification plant equipment 120.
From the output (actual measured value of solar radiation R PV at the current time), and based on this deviation, correct the predicted amount of solar radiation R ET after time h output from the solar radiation predicting unit 106 to correct the amount of solar radiation. The value RT is obtained and supplied to the residual chlorine decomposition amount calculation unit 108 and the manipulated variable correction value calculation unit 110.
残留塩素分解量演算部108は前記日射量修正値RTに基
づいて日射による残留塩素分解量DSTを求め、これを塩
素注入率演算部109に供給する。Residual chlorine degradation amount calculation unit 108 obtains a residual chlorine amount of decomposition DS T by solar radiation on the basis of the solar radiation amount correction value R T, and supplies it to the chlorine injection rate calculating section 109.
塩素注入率演算部109はフロック形成池104の検水ポン
プ114に設けられた残留塩素計116の出力（残留塩素濃度
の実測値RC）と、予め設定されている目標残留塩素濃度
と、前記残留塩素分解量DSTとに基づいて塩素注入率CLT
を求めこれを加算部111に供給する。The chlorine injection rate calculation unit 109 includes an output of the residual chlorine meter 116 provided in the water sampling pump 114 of the floc forming pond 104 (actual measured value R C of the residual chlorine concentration), a preset target residual chlorine concentration, chlorine injection rate CLT on the basis of the residual chlorine amount of degradation DS T
And supplies it to the adding unit 111.
また、前記操作量修正値演算部110は現時点における
前記日射修正量RTの変化の傾向から操作量修正値DVTを
求めこれを前記加算部111に供給する。Also, the operation amount correction value calculation section 110 supplies the calculated the solar radiation correction amount R T tends from the operation amount correction value DV T of change in current in the addition unit 111.
加算部111は前記操作量修正値DVTと塩素注入率CLTと
を加算して塩素注入設定値CLTを求め、この塩素注入設
定値CLTに基づいて制御器122を制御して塩素の注入量を
制御させる。Adding section 111 obtains a chlorine injection setpoint CL T by adding the said operation amount correction value DV T and chlorine injection rate CL T, chlorine and controls the controller 122 on the basis of the chlorine injection setting value CL T Control the injection volume.
このように、この塩素注入制御装置121においては、
１日の日射量推移を予測し、この予測内容に基づいて日
射による塩素の分解量を予測して、日射による残留塩素
の分解量を常に補償しながら処理水中の残留塩素濃度が
予め設定されている目標値と一致するように塩素の注入
量を制御している。Thus, in the chlorine injection control device 121,
The amount of residual chlorine in the treated water is set in advance while always predicting the change in the amount of chlorine due to solar radiation based on the prediction contents. The amount of chlorine injected is controlled to match the target value.
（発明が解決しようとする課題） しかしながら、このような方法は天候が悪化して日射
による残留塩素の分解量が少量になったり、正午から数
時間を経過して日射による残留塩素の分解量を補う必要
がなくなった場合にも、日射補正演算によって塩素注入
率の補正を行なうため、塩素が過剰に注入されて不経済
なばかりか、不純物を生成させるという問題があった。(Problems to be Solved by the Invention) However, in such a method, the weather deteriorates and the amount of residual chlorine decomposed by solar radiation is reduced, or after several hours from noon, the amount of decomposed residual chlorine is reduced. Even when it is no longer necessary to compensate, the chlorine injection rate is corrected by the solar radiation correction operation, so that chlorine is excessively injected, which is not only uneconomical but also generates impurities.
更に、不純物対策のため、前塩素注入での塩素の注入
を控え、中塩素、後塩素注入で塩素を補う方法をとる場
合、前塩素注入で塩素の過剰注入が発生すると、中塩素
処理や後塩素注入処理が難しくなってしまうという問題
があった。Furthermore, in order to take measures against impurities, refrain from injecting chlorine in the pre-chlorine injection, and supplement the chlorine with the medium chlorine and post-chlorine injection. There was a problem that chlorine injection processing became difficult.
本発明は上記の事情に鑑み、日射に起因して沈澱池で
消失する塩素を補償する際、塩素の過剰注入を防止し、
沈澱池出口の残留塩素濃度を目標の値に保持することが
できる塩素注入制御装置を提供することを目的としてい
る。In view of the above circumstances, the present invention, when compensating for chlorine that disappears in the sedimentation basin due to solar radiation, prevents excessive injection of chlorine,
It is an object of the present invention to provide a chlorine injection control device capable of maintaining the residual chlorine concentration at the outlet of a precipitation tank at a target value.
（課題を解決するための手段） 上記の目的を達成するために本発明による塩素注入制
御装置は、予め設定されている日の出から日没までの各
時刻毎にその時刻より所定時間以前にて各時刻毎の予測
日射量を求める日射量予測部と、この日射量予測部にて
現在時刻より所定時間以前に求められた現在時刻の予測
日射量と現在時刻における日射量実測値とを用いてその
時点で求められる予測日射量を補正して日射量修正値を
求める日射量修正部と、この日射量修正部によって得ら
れる日射量修正値に基づいて日射による残留塩素分解量
を求める残留塩素分解量演算部と、 この残留塩素分解量演算部によって得られた残留塩素
分解量および水中の残留塩素濃度の実測値、目標残留塩
素濃度に基づいて塩素注入率を求める塩素注入率演算部
と、前記日射量修正部によって得られた前記日射修正量
の現時点での日射量の時間変化から操作修正値を求める
操作修正値演算部と、この操作修正値演算部によって得
られた操作修正値と前記塩素注入率演算部によって得ら
れた塩素注入率とを加算する加算部と、前記日射実測値
および日没時刻より所定時間前からの残留塩素濃度の実
測値とが所定の条件を満たしているとき補正不要と判断
する判断部と、この判断部によって補正不要と判断され
たとき前記加算部の出力から残留塩素分解量補正分を除
去して塩素注入を制御し、また補正必要と判断されたと
き前記加算部の出力に基づいて塩素注入を制御する補償
分キャセル部とを備えたことを特徴としている。(Means for Solving the Problems) In order to achieve the above object, the chlorine injection control device according to the present invention provides a chlorination injection control device which is provided with a predetermined time from sunrise to sunset before a predetermined time. An insolation amount predicting unit that obtains a predicted amount of insolation for each time, and the insolation amount using the predicted insolation amount of the current time and the insolation actually measured value at the current time obtained a predetermined time before the current time in the insolation amount estimating unit. A solar radiation correction unit that corrects the predicted solar radiation obtained at the time point to obtain a solar radiation correction value, and a residual chlorine decomposition amount that obtains a residual chlorine decomposition amount by solar radiation based on the solar radiation correction value obtained by the solar radiation correction unit A calculation unit, a chlorine injection rate calculation unit for obtaining a chlorine injection rate based on the residual chlorine decomposition amount obtained by the residual chlorine decomposition amount calculation unit and an actually measured value of the residual chlorine concentration in water, and a target residual chlorine concentration, An operation correction value calculating unit for obtaining an operation correction value from a temporal change in the amount of insolation at the present time of the insolation correction amount obtained by the irradiation correction unit; an operation correction value obtained by the operation correction value calculating unit; An addition unit for adding the chlorine injection rate obtained by the injection rate calculation unit, and correction when the actual measured value of the solar radiation and the measured value of the residual chlorine concentration from a predetermined time before the sunset time satisfy a predetermined condition. A determining unit that determines that it is unnecessary, and controls the chlorine injection by removing the residual chlorine decomposition amount correction amount from the output of the adding unit when it is determined that correction is unnecessary by the determining unit; and when it is determined that correction is necessary, And a compensation part for controlling chlorine injection based on the output of the addition part.
（作用） 上記の構成において、１日の日射量の推移を予測し、
この予測動作によって得られた予測値によって塩素の分
解量を把握するとともに、制御実施日に実測した日射量
によって前記分解量を修正して水中の残留塩素濃度を目
標値に一致させるべく制御を行ない、更に塩素の補償が
必要かどうかを判断し、必要がない場合には塩素注入量
の補償動作を中断する。(Operation) In the above configuration, a change in the amount of solar radiation per day is predicted,
The amount of chlorine decomposition is grasped by the predicted value obtained by this prediction operation, and the control is performed so that the decomposition amount is corrected by the insolation actually measured on the control execution day and the residual chlorine concentration in the water matches the target value. Then, it is determined whether or not it is necessary to compensate for chlorine. If not, the operation for compensating for the chlorine injection amount is interrupted.
（実施例） 第１図は本発明による塩素注入制御装置の一実施例を
用いた浄水場システムの一例を示すブロック図である。(Embodiment) FIG. 1 is a block diagram showing an example of a water purification plant system using an embodiment of a chlorine injection control device according to the present invention.
この図に示す浄水場システムは原水を処理する浄水場
設備22と、この浄水場設備22の塩素注入量を制御する塩
素注入制御装置23とを備えている。The water purification plant system shown in this figure includes a water purification plant 22 for treating raw water, and a chlorine injection control device 23 for controlling the chlorine injection amount of the water purification plant 22.
そして、浄水場設備22においては、取水口から取り込
まれた原水が着水井１に流入し、この出口で塩素注入装
置から消毒のための塩素と、アルカリ注入装置（図示は
省略する）からPH調整用のアルカリ剤が注入される。更
に、これらの処理が終了した水は除濁のために凝集剤注
入装置から凝集剤の注入を受け、急速混和池２にてフラ
ッシュミキサー３により急激に撹拌される。この後、フ
ロック形成池４でゆっくり撹拌されてフロックが形成さ
れ、沈澱池５にて大部分のフロックが沈澱除去される。
沈澱池５の流出水はろ過池12で清澄になり後塩素注入機
（図示は省略する）によって後塩素が注入されて浄水池
13に貯えられる。Then, in the water purification plant equipment 22, raw water taken in from the water intake port flows into the landing well 1, and at this outlet, chlorine for disinfection from a chlorine injection device and pH adjustment from an alkali injection device (not shown). Alkaline agent is injected. Further, the water after these treatments is injected with a coagulant from a coagulant injecting device for turbidity, and is rapidly stirred by the flash mixer 3 in the rapid mixing pond 2. Thereafter, the floc is slowly stirred in the floc forming pond 4 to form flocs, and most of the flocs are precipitated and removed in the sedimentation pond 5.
The effluent from the sedimentation basin 5 is clarified in the filtration basin 12 and post-chlorine is injected by a chlorinator (not shown).
Stored at 13.
また、塩素注入制御装置23においては次に述べるよう
にして塩素の注入量を制御する。The chlorine injection controller 23 controls the chlorine injection amount as described below.
まず、日射量予測部６は第２図に示す如く実際の日射
が始まるより日の出早め時間ｈだけ前から時間ｈ後の予
測日射量RETを演算する。この予測日射量RETは次式に示
す如く浄水場の方位ｐ、歴ｍおよび現在時刻tiの関数で
あることが知られている。First, calculating the predicted amount of solar radiation R ET after time h before the solar radiation amount prediction unit 6 by Sunrise earlier time h than the actual solar radiation, as shown in Figure 2 begins. It is known that the predicted solar radiation RET is a function of the azimuth p of the water purification plant, the history m, and the current time t i as shown in the following equation.
RET＝ｆ（p,m,ti） …（１） 具体的には、理科年表（昭和63年、東京天文台編簒）
のデータを使用して日の出と日没時刻を計算し、この両
時刻から算出した日照時間TSと、１年を周期とする正弦
波関数で表わした１日の最高日射量RMAXとに基づいて次
式に示す演算を行ない、これによって得られた予測日射
量RETを日射量修正部７に供給する。R ET = f (p, m, t i ) (1) Specifically, a science chronology (1988, Tokyo Observatory, usur)
The sunrise time and the sunset time are calculated using the data of the above, and based on the sunshine time T S calculated from these two times and the maximum daily radiation amount R MAX expressed by a sine wave function having a cycle of one year. performs computation shown in the following equation Te, supplies the predicted solar radiation R ET to thereby resulting in solar radiation amount correction unit 7.
但し、t:日の出から現在時刻までの経過時間 α：過去数年間の日射データから求められる係
数 β：過去数年間の日射データから求められる係
数 γ：過去数年間の日射データから求められる係
数 d:元旦から数えた制御を行なっている日までの
日数 日射量修正部７は前記日射量予測部６にて現在時刻よ
り所定時間ｈ以前に求められた現時点での予測日射量R
ET-hと前記沈澱池５の近傍に設けられた日射計18の指示
値（日射量実測値）RPVとを比較し、次式に基づいて日
射量修正値RTを求め、これを残留塩素分解演算部８と操
作量修正値演算部１とに供給する。 Where, t: elapsed time from sunrise to the current time α: coefficient obtained from solar radiation data for the past several years β: coefficient obtained from solar radiation data for the past several years γ: coefficient obtained from solar radiation data for the past several years d: The number of days from the New Year's Day to the day on which the control is being performed. The insolation correction unit 7 predicts the insolation R at the present time obtained by the insolation prediction unit 6 before the predetermined time h from the current time.
ET-h is compared with the indicated value (actually measured value of solar radiation) R PV of the pyranometer 18 provided in the vicinity of the sedimentation basin 5 to obtain a corrected amount of solar radiation RT based on the following equation. It is supplied to the chlorine decomposition calculation section 8 and the manipulated variable correction value calculation section 1.
RT＝RET＋k1・（RPV−RET-h） …（４） 但し、k1:浄水場に固有の値を有する定数 残留塩素分解量演算部８は前記日射量修正値RTを基に
して次式に演算を行なって日射による残留塩素分解量DS
Tを求め、これを塩素注入率演算部９に供給する。R T = R ET + k 1 · (R PV -R ET-h ) (4) where k 1 is a constant having a value specific to the water purification plant. The residual chlorine decomposition amount calculation unit 8 calculates the solar radiation correction value R T. Is calculated by the following formula based on
T is obtained and supplied to the chlorine injection rate calculator 9.
DST＝DST-1＋k2・k3・（RT−RT-1） …（５） 但し、k2:日射量を残留塩素濃度に変換するための係
数であり季節によって変化する値 k3:日射補正の強度を調整するための係数であ
り浄水場に固有の値 RT-1:前回周期での修正日射量の値 塩素注入率演算部９は前記残留塩素分解量演算部８で
求めた日射による塩素分解量DSTと、前記フロック形成
池４の検水ポンプ14に設けられた残留塩素計16から出力
される残留塩素濃度Rcとを入力として、次式に示す演算
を行なってフィードバックによる塩素注入率CLTを計算
し、これを加算部11に供給する。DS T = DS T-1 + k 2 · k 3 · (R T -R T-1 ) (5) where k 2 is a coefficient for converting solar radiation into residual chlorine concentration, and a value that varies with the season k 3 : a coefficient for adjusting the intensity of the solar radiation correction and a value specific to the water treatment plant R T-1 : the value of the corrected solar radiation in the previous cycle The chlorine injection rate calculator 9 is the residual chlorine decomposition calculator 8 in a chlorine degradation amount DS T by solar radiation determined, as inputs and residual chlorine concentration R c which is output from the residual chlorine meter 16 provided in the test water pump 14 of the flocculation basin 4, the calculation shown in the following equation performing chlorine injection rate CL T calculated by feedback, and supplies this to the adder 11.
ET＝RSV−RC＋DST …（６） ΔCL＝KC｛KP・（ET−ET-1）＋Ki・ET｝ …（７） CLT＝CLT-1＋ΔCL …（８） 但し、ET ：今回周期での偏差 ET-1 :前回周期での偏差 RSV ：残留塩素目標値 CLT-1:前回周期での塩素注入率の値 Kc ：制御ゲイン Kp ：制御ゲイン Ki ：制御ゲイン また、操作量修正値演算部10は次式に示す演算を行な
って前記日射量修正量RTの現時点での日射量の変化の傾
向から操作量修正値DVTを求め、これを前記加算部11に
供給する。 E T = R SV -R C + DS T ... (6) ΔCL = K C {K P · (E T -E T-1) + K i · E T} ... (7) CL T = CL T-1 + ΔCL ... (8) However, E T: deviation in the current period E T-1: deviation in the previous cycle R SV: residual chlorine target value CL T-1: the value of the chlorine injection rate at the previous cycle K c: control gain K p : control gain K i : control gain Further, the manipulated variable correction value calculation unit 10 performs an operation shown in the following equation to calculate the manipulated variable correction value DV from the tendency of the change of the solar radiation correction amount RT at the present time. T is obtained and supplied to the adding unit 11.
DMT＝DMT-1＋k2・k4・（RT−2RT-1＋RT-2） …（９） DVT＝DVT-1＋DMT …（10） 但し、RT-1 :前回周期での日射修正量の値 RT-2 :前々回周期での日射修正量の値 k4 ：浄水場に固有の定数 DMT ：修正パラメータの値 DMT-1:前回周期での修正パラメータの値 DVT-1:前回周期での操作量修正値 加算部11は前記操作量修正値DVTと塩素注入率CLTとを
加算して塩素注入に対する対応遅れをキャンセルして迅
速に制御を行なうことができる塩素注入設定値CLTを求
め、これを判断部19に供給する。 DM T = DM T-1 + k 2 · k 4 · (R T -2R T-1 + R T-2) ... (9) DV T = DV T-1 + DM T ... (10) However, R T-1: The value of the amount of solar radiation correction in the previous cycle R T-2 : The value of the amount of solar radiation correction in the cycle before the previous cycle k 4 : A constant specific to the water treatment plant DM T : The value of the correction parameter DM T-1 : The correction parameter in the previous cycle value DV T-1: the operation amount correction value addition unit 11 in the previous period rapidly controlled to cancel the corresponding delay with respect to chlorine injected adding the chlorine injection rate CL T the manipulated variable correction value DV T seeking chlorine injection setting value CL T which can be performed, and supplies this to the determining unit 19.
判断部19は天候の悪化により、塩素の補正が不要にな
ったかどうかを調べるために、次式に示す如く所定時間
ｈ以前に求められた現在時刻の予測日射量RET-hに対す
る日射実測値RPVの割合を求め、これが設定値Ｒ以下で
あるかどうかをチェックする。The determining unit 19 measures the actual solar radiation value for the predicted solar radiation amount R ET-h at the current time obtained before the predetermined time h as shown in the following equation to check whether the chlorine correction is unnecessary due to the deterioration of the weather. The ratio of R PV is obtained, and it is checked whether or not this is equal to or less than the set value R.
RPV/RET-h＜Ｒ …（11） 更に、日没時刻より予め設定されている時間前から、
塩素の補償がすでに十分行われ、これ以上日射補正演算
を続けて塩素を補償すると、過剰注入になるか調べるた
めに、次式に基づいて残留塩素濃度実測値RCと、目標残
留塩素濃度RSVとの偏差を求め、これが設定された値Ａ
以上であるかどうかをチェックする。R PV / R ET-h <R ... (11) Further, from a time before the set time before the sunset time,
In order to check if chlorine is already compensated for enough and compensation for chlorine is continued by further calculating the solar radiation correction, the measured residual chlorine concentration R C and the target residual chlorine concentration R Deviation from SV is calculated and this is set value A
Check if this is the case.
RC−RSV＞Ａ …（12） そして、これら（10）式、（11）式のいずれもが満た
されていないとき、日射補正を行なう必要があると判断
して前記塩素注入率CLTを制御器21に供給する。R C −R SV > A (12) Then, when none of these equations (10) and (11) is satisfied, it is determined that the solar radiation correction needs to be performed, and the chlorine injection rate CL T is determined. Is supplied to the controller 21.
また、前記（10）式または（11）式のいずれかが満た
されているとき、日射補正演算を終了すべきと判断して
前記塩素注入率CLTを補償分キャセル部20に供給する。Further, when either the formula (10) or the formula (11) is satisfied, it is determined that the solar radiation correction calculation is to be terminated, and the chlorine injection rate CLT is supplied to the compensation portion casing 20.
補償分キャセル部20は前記判断部19から塩素注入率CL
Tが供給されたとき、次式に示す演算を行なって前記塩
素注入率CLTから補償分に相当する日射による残留塩素
分解量DSTを差し引き、日射の補償を行なわないときの
塩素注入率を求め、これを新たな塩素注入率CLTとして
制御器21に供給する。The compensation portion casing unit 20 receives the chlorine injection rate CL from the judgment unit 19.
When T is supplied, subtract the residual chlorine amount of decomposition DS T by solar radiation which performs the calculation shown in the following equation corresponding to the compensation amount from the chlorine injection rate CL T, chlorine injection rate when not performed compensation of insolation , and supplies to the controller 21 so as a new chlorine injection rate CL T.
CLT←CLT−DST …（13） 制御器21は前記補償分キャセル部20から塩素注入率CL
Tを供給されたときにはこの塩素注入率CLTに急速混和流
入量を乗じて塩素注入量設定値を求め、また前記判断部
19から塩素注入率CLTが供給されたときにはこの塩素注
入率CLTに急速混和池流入量を乗じて塩素注入量設定値
を求め、この塩素注入量設定値に基づいて塩素注入量を
制御する。CL T ← CL T −DS T (13) The controller 21 sends the chlorine injection rate CL from the compensation portion
When T is supplied, the chlorine injection rate CL T is multiplied by the rapid admixture inflow to obtain a chlorine injection amount set value.
When the chlorine injection rate CL T is supplied from the 19 obtains the chlorine injection amount set value by multiplying the rapid mixing basin inflow to the chlorine injection rate CL T, controls the chlorine injection amount based on the chlorine injection amount set value .
このようにこの実施例においては、日射による外乱に
対し予測日射量によってフィードフォワード的に応答遅
れを補償し、かつ実測日射量でその過剰分を修正し、更
に補償の必要がないときには補償を中断するようにした
ので、実際の日射量が第３図（ａ）に示す如くなってい
るとき、第３図（ｂ）に示す如くフロック形成池４の入
口水残留濃度を低減させることができ、これによって第
３図（ｃ）に示す如く沈澱池５の残留塩素濃度をほぼ目
標値に保つことができる。As described above, in this embodiment, the response delay is compensated for the disturbance due to the solar radiation in a feedforward manner by the predicted solar radiation, and the excess is corrected by the actually measured solar radiation, and the compensation is interrupted when no further compensation is necessary. When the actual amount of solar radiation is as shown in FIG. 3 (a), the residual water concentration at the inlet of the floc formation pond 4 can be reduced as shown in FIG. 3 (b), As a result, the residual chlorine concentration in the sedimentation basin 5 can be kept substantially at the target value as shown in FIG. 3 (c).
これによって、処理水の水質を安定化することができ
るとともに、残留塩素の低下によって引き起こされる沈
澱池５の腐敗や藻の発生を防止することができ、更に塩
素の過剰注入による不純物の生成を防止して衛生的でか
つ安全な水を供給することができる。This makes it possible to stabilize the quality of the treated water, to prevent the decay of the sedimentation basin 5 and the generation of algae caused by the decrease in residual chlorine, and to prevent the generation of impurities due to excessive injection of chlorine. Sanitary and safe water can be supplied.
以上説明したように本発明によれば、日射に起因して
沈澱池で消失する塩素を補償する際、塩素の過剰注入を
防止し、沈澱池出口の残留塩素濃度を目標の値に保持す
ることができる。As described above, according to the present invention, when compensating for chlorine that disappears in a precipitation tank due to solar radiation, excessive injection of chlorine is prevented, and the residual chlorine concentration at the exit of the precipitation tank is maintained at a target value. Can be.
第１図は本発明による塩素注入制御装置の一実施例を用
いた浄水場システムの一例を示すブロック図、第２図は
同実施例の動作例を説明するため模式、第３図は同実施
例の効果を説明するための模式図、第４図は従来から知
られている塩素注入制御装置の一例を用いた浄水場シス
テムの一例を示すブロック図である。 ６……日射量予測部 ７……日射量修正部 ８……残留塩素分解量演算部 ９……塩素注入率演算部 10……操作修正値演算部 11……加算部 19……判断部 20……補正分キャセル部 22……浄水場設備 23……塩素注入制御装置FIG. 1 is a block diagram showing an example of a water purification plant system using an embodiment of a chlorine injection control device according to the present invention, FIG. 2 is a schematic diagram for explaining an operation example of the embodiment, and FIG. FIG. 4 is a schematic diagram for explaining the effect of the example, and FIG. 4 is a block diagram showing an example of a water purification plant system using an example of a conventionally known chlorine injection control device. 6 solar radiation prediction unit 7 solar radiation correction unit 8 residual chlorine decomposition amount calculation unit 9 chlorine injection rate calculation unit 10 operation correction value calculation unit 11 addition unit 19 determination unit 20 …… Cassage part for correction 22 …… Water treatment plant equipment 23 …… Chlorine injection control device
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０２Ｆ 1/76 Ｃ０２Ｆ 1/76 Ａ Continued on the front page (51) Int.Cl. 6 Identification number Reference number in the agency FI Technical display location C02F 1/76 C02F 1/76 A
Claims (3)
各時刻毎にその時刻より所定時間以前にて各時刻毎の予
測日射量を求める日射量予測部と、 この日射量予測部にて現在時刻より所定時間以前に求め
られた現在時刻の予測日射量と現在時刻における日射量
実測値とを用いてその時点で求められる予測日射量を補
正して日射量修正値を求める日射量修正部と、 この日射量修正部によって得られる日射量修正値に基づ
いて日射による残留塩素分解量を求める残留塩素分解量
演算部と、 この残留塩素分解量演算部によって得られた残留塩素分
解量および水中の残留塩素濃度の実測値、目標残留塩素
濃度に基づいて塩素注入率を求める塩素注入率演算部
と、 前記日射量修正部によって得られた前記日射修正量の現
時点での日射量の時間変化から操作修正値を求める操作
修正値演算部と、 この操作修正値演算部によって得られた操作修正値と前
記塩素注入率演算部によって得られた塩素注入率とを加
算する加算部と、 前記日射実測値および日没時刻より所定時間前からの残
留塩素濃度の実測値とが所定の条件を満たしているとき
補正不要と判断する判断部と、 この判断部によって補正不要と判断されたとき前記加算
部の出力から残留塩素分解量補正分を除去して塩素注入
を制御し、また補正必要と判断されたとき前記加算部の
出力に基づいて塩素注入を制御する補償分キャセル部
と、 を備えたことを特徴とする塩素注入制御装置。An insolation amount predicting section for obtaining a predicted amount of insolation at each time from a sunrise to sunset which is set in advance and a predetermined time before the time, and an insolation amount estimating section. A solar radiation correction unit that corrects the predicted solar radiation obtained at that time using the predicted solar radiation at the current time obtained before a predetermined time before the current time and the actual solar radiation measured at the current time to obtain a solar radiation correction value. And a residual chlorine decomposition amount calculating section for calculating the residual chlorine decomposition amount due to the solar radiation based on the solar irradiation correction value obtained by the solar irradiation correction section; and the residual chlorine decomposition amount and the underwater obtained by the residual chlorine decomposition amount calculating section. The actual measured value of the residual chlorine concentration, the chlorine injection rate calculation unit for obtaining the chlorine injection rate based on the target residual chlorine concentration, and the time change of the solar radiation amount at the present time of the solar radiation correction amount obtained by the solar radiation correction unit An operation correction value calculation unit for obtaining an operation correction value; an addition unit for adding the operation correction value obtained by the operation correction value calculation unit to the chlorine injection rate obtained by the chlorine injection rate calculation unit; A determining unit that determines that correction is unnecessary when the value and the measured value of the residual chlorine concentration from a predetermined time before the sunset time satisfy a predetermined condition; and an adding unit when the determining unit determines that correction is unnecessary. A control unit for controlling the chlorine injection by removing the residual chlorine decomposition amount correction amount from the output of the control unit, and controlling the chlorine injection based on the output of the adding unit when it is determined that the correction is necessary. A chlorine injection control device.
もしくは日没時刻より所定時間前からの残留塩素濃度の
実測値が設定値以上であるとき補正不要と判断する請求
項１記載の塩素注入制御装置。2. The method according to claim 1, wherein the determining unit determines that correction is unnecessary when the measured actual solar radiation value is equal to or less than a set value or when the actual measured value of the residual chlorine concentration from a predetermined time before the sunset time is equal to or greater than the set value. Chlorine injection control device.
在の予測日射量に対する現在時刻の日射実測値の割合が
設定値以下もしくは日没時刻より所定時間前からの残留
塩素の実測値と目標残留塩素濃度との差が所定値以上で
あるとき補正不要と判断する請求項１記載の塩素注入制
御装置。3. The method according to claim 1, wherein the ratio of the actual measured solar radiation value at the current time to the current predicted solar radiation amount obtained before the predetermined time is equal to or less than a set value or the measured residual chlorine value from the predetermined time before the sunset time. 2. The chlorine injection control device according to claim 1, wherein when the difference from the target residual chlorine concentration is equal to or more than a predetermined value, it is determined that correction is unnecessary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27601689A JP2592965B2 (en) | 1989-10-25 | 1989-10-25 | Chlorine injection control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27601689A JP2592965B2 (en) | 1989-10-25 | 1989-10-25 | Chlorine injection control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03137989A JPH03137989A (en) | 1991-06-12 |
| JP2592965B2 true JP2592965B2 (en) | 1997-03-19 |
Family
ID=17563614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27601689A Expired - Lifetime JP2592965B2 (en) | 1989-10-25 | 1989-10-25 | Chlorine injection control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2592965B2 (en) |
-
1989
- 1989-10-25 JP JP27601689A patent/JP2592965B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03137989A (en) | 1991-06-12 |
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