JP4469313B2 - Pipe network chemical injection control device, pipe network chemical injection control method, and pipe network chemical injection control program - Google Patents

Description

  The present invention relates to a chemical injection control device based on the water quality of a pipe network.

In Japan, water disinfection is performed based on the residual chlorine concentration at the end of tap water taps. To that end, chlorine injection at water treatment plants must ensure the residual chlorine concentration stipulated by the Water Supply Law.
By the way, the quality of the water sent from the water purification plant also fluctuates due to the fluctuation effect of the water source water quality. In addition, the water demand of consumers varies greatly depending on time, season and weather. Thus, when the amount of water flowing into the distribution pipe network from the distribution base and the water quality (residual chlorine concentration, pH, water temperature, etc.) change over time, the distribution pipe network has a wide area. Elapsed time and water quality are not uniform. Therefore, if it is attempted to confirm that the residual chlorine concentration in the pipe network is maintained and managed, it is necessary to perform sampling and water quality measurement at a large number of points and at a high frequency, which is actually difficult to implement. . For this purpose, a method for predicting the residual chlorine concentration of the entire pipe network from the pipe model, water volume model, and water quality at the distribution base is required, and efforts are being made to develop the method.

As a conventional technique for operation management of residual chlorine concentration in transmission and distribution water, a method of performing chlorine injection control by estimating residual chlorine concentration and carcinogenic substances (see Patent Document 1) has been proposed.
Japanese Patent Laid-Open No. 10-137764

  In this prior art, chlorine injection control is performed after grasping the residual chlorine concentration between two arbitrary points. In this case, for example, control is performed so that the residual chlorine concentration at the end of the two points having the longest residence time on the pipe network reaches the legal reference value. However, in the case of multiple injections of chlorine, since they affect each other depending on the connection relationship of the pipelines, simply grasping the residual chlorine concentration between any two points, grasp the residual chlorine concentration of the entire pipe network Can not do it. In addition, there are many combinations of chlorine injection amounts for multiple chemical injection devices, and the most appropriate combination of chlorine injection amounts from among a large number of combinations of chlorine injection amounts can be obtained simply by grasping the residual chlorine concentration between any two points. Can not be extracted. If the optimum combination of chlorine injection amounts cannot be extracted, the residual chlorine concentration on the pipe network cannot be optimized and leveled. Since it is not possible to equalize the residual chlorine concentration in the pipe network of multi-point injection of chlorine, the difference in residual chlorine concentration from the distribution base to the end of the distribution cannot be reduced, and safer water with higher quality can be secured. I can't do it.

  Therefore, in view of the above problems, the present invention has an object to provide means that enables water quality to be leveled in a water distribution network and to calculate the optimal chemical injection amount of a plurality of chemical injection devices. To do.

  The present invention that solves the above-mentioned problems is a chemical injection control device for a pipe network that outputs a chemical injection amount to a chemical injection device that injects chemicals into a water distribution pipe network, and is configured to input a target value for the water quality of the distribution pipe network. Target value input means, water quality calculation means for calculating the water quality at a plurality of points of the distribution pipe network from the data of the distribution pipe network, and leveling index for calculating the water quality leveling index from the water quality calculation value calculated by the water quality calculation means Calculates the chemical injection amount of multiple chemical injection devices from the data including the water quality target value input by the calculation means and the water quality target value input means and the leveling index calculated by the leveling index calculation means, and outputs to each chemical injection device And a chemical injection amount calculating means. The present invention includes a pipe network chemical injection control method and a pipe network chemical injection control program.

  According to the present invention, the water quality can be leveled in the water distribution pipe network, and optimal chemical injection control of a plurality of chemical injection devices can be performed.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. This embodiment shows the example which applied this invention to chlorine injection of the water distribution pipe network which a water purification plant has jurisdiction over.

≪Configuration of equipment and water distribution pipe network≫
Drawing 1 is a figure showing composition of a chemical injection control device of a water purification plant concerning this embodiment, and a water distribution pipe network.

  First, with reference to FIG. 1, the structure of the water purification plant jurisdiction distribution pipe network 100 is demonstrated. The water purification pipe network 100 is a water distribution network managed by a water purification plant including the water reservoir 2 and the water distribution network 3. The water purification plant jurisdiction water distribution pipe network 100 includes a purified water 1, a water distribution reservoir 2, a water distribution pipe network 3, sensors 4, 5, and 7 and a chemical injection device 6.

  In the purified water 1, the water treated by the purified water treatment process is cleaned through post-chlorination (not shown). The purified water 1 flows into the distribution reservoir 2. The water in the distribution reservoir 2 is delivered to each consumer by the distribution pipe network 3. The sensor 4 measures the water quality at the outlet of the distribution reservoir 2. The sensor 5 is disposed on the water distribution pipe network 3 and measures the water quality on the water distribution pipe network 3. The water quality here is, for example, residual chlorine concentration, pH, alkalinity, water temperature, and the like. The chemical injection device 6 injects chemicals into, for example, the outlet of the distribution reservoir 2 or the distribution main line of the distribution pipe network 3. Examples of such chemicals include chlorine for sterilization and disinfection, acid and alkali agents for adjusting pH in water, and fluorine added to clean water from the viewpoint of dental caries prevention. The sensor 7 measures the amount of medicine remaining, the amount of injection, and the like of the medicine injection device 6. A plurality of sensors 5 and 7 and chemical injection devices 6 are arranged in the water distribution pipe network 3 as necessary (so that multipoint injection is possible).

  Next, with reference to FIG. 1, the structure of the chemical | medical agent injection | pouring control apparatus (chemical | medical agent injection control apparatus of a pipe network) 20 which makes the control object the water purification plant jurisdiction water distribution pipe network 100 is demonstrated. The chemical injection control device 20 is a device that outputs an optimal chemical injection amount for the chemical injection device 6, and includes a pipe network data input means 30, a pipe network database 35, a water quality calculation means 40, and a water quality target value input means 51. And a chemical injection device operating status input means (operating status input means) 52, a leveling index calculating means 70, and an optimal chemical injection amount calculating means (chemical injection amount calculating means) 75.

  The pipe network data input means 30 is data of each pipe constituting the water distribution pipe network 3 (tube diameter, pipe length, material, flow rate, flow velocity, flow direction, etc.), connection relation between pipes and nodes, water pipe network Position of the chemical injection device 6 on the trunk line 3, the amount of stored chlorine and chlorine injection of the chemical injection device 6, the amount of water demand of the distribution pipe network 3 under the jurisdiction of the water purification plant and the amount of water drawn from the nodes, Input measurement data. Here, the node is a connection point between the pipeline and the pipeline. The input data of the pipe network data input means 30 may be input by the operator using the keyboard or mouse (not shown) of the chemical injection control device 20, or the measured value or the calculated value of the water purification pipe network 100 can be used. It may be received and used as input data. The calculated values here are, for example, the water demand and water predicted by various factors such as the flow rate, flow velocity, flow direction, dwell time calculated by pipe network calculation, climate, weather, etc. For example, the fluctuation pattern of demand. The input data of the pipe network data input means 30 is sent to the pipe network database 35 and stored therein.

  The pipe network database 35 stores the pipe network data input by the pipe network data input means 30. The pipe network database 35 stores, as pipe network data, pipe data of the distribution pipe network 3, information on the chemical injection device 6, a fluctuation pattern of the amount of water demand, and the like. The chemical injection control device 20 can display the data stored in the pipe network database 35 on a display or the like (not shown) as necessary.

The water quality calculation means 40 calculates the water quality of the distribution pipe network 3 based on the pipe network data stored in the pipe network database 35 or the data input by the pipe network data input means 30. The water quality calculation means 40 calculates the residual chlorine concentration of the water distribution pipe network 3 using, for example, a residual chlorine concentration reduction model. Here, an example of a residual chlorine concentration reduction model is shown in Formula (1). In equation (1), the residual chlorine concentration C (t) at the downstream node is calculated from the initial residual chlorine concentration C _{0 at the} upstream node, the residual chlorine concentration reduction rate coefficient k, and the residence time t. An example is shown. In addition, an example of the residual chlorine concentration decreasing rate coefficient k in consideration of the pipe type, material, pipe diameter, and water temperature of the pipe line is shown in Expression (2).

C (t) = C ₀ × exp (−k × t) (1)
k = exp (−αD + βT + γ) (2)

Here, C (t): residual chlorine concentration (mg / L) after t time, C ₀ : initial residual chlorine concentration (mg / L), t: residence time (hr), k: residual chlorine concentration decrease rate coefficient (Hr ⁻¹ ), D: tube diameter (m), T: water temperature (° C.), α, β, γ: water temperature, coefficient reflecting tube diameter

It should be noted that the initial residual chlorine concentration C ₀ in equation (1) is a value shown in equation (3) when chlorine is additionally injected by the chemical injection device 6.

C ₀ = C ₁ + C ₂ (3)

Here, C ₀ : Initial residual chlorine concentration [mg / L], C ₁ : Residual chlorine concentration in water [mg / L], C ₂ : Residual chlorine concentration [mg / L] added by the chemical injection device

  By applying the formulas (1), (2) and (3) to the pipes of all the water distribution pipe networks 3, the residual chlorine concentration of the whole water distribution pipe network 3 can be calculated. The residual chlorine concentration reduction model may use, for example, a fuzzy inference model, a neuro model, an original empirical formula of a water treatment plant, or the like, in addition to the method according to the equation (1).

  The water quality target value input means 51 inputs the water quality target value of the water distribution pipe network 3. The water quality here is, for example, residual chlorine concentration, pH, alkalinity, and the like. Details of the water quality target value input means 51 will be described later.

  The chemical injection device operation status input means 52 inputs the currently operable chemical injection device 6 among the plurality of chemical injection devices 6 arranged in the water distribution pipe network 3, the amount of chemical remaining, the chemical injection capability, and the like. Here, the chemical injection capacity is, for example, the minimum and maximum amounts that can be injected per 1 h (time) of a chlorine injection device (a specific example of the chemical injection device 6). Note that the chemical injection device operating status input means 52 may not be provided in the case of operation with a predetermined number of predetermined units or automatic setting described later in FIG. Details of the medicine injection device operating status input means 52 will be described later.

  The leveling index calculating means 70 calculates a water quality leveling index from the water quality data at a plurality of points calculated by the water quality calculating means 40. Here, the water quality data may be data obtained by one calculation, or may be a statistical value of data calculated a plurality of times within a predetermined period. The water quality leveling index is, for example, an average deviation or a standard deviation of the residual chlorine concentration in the water distribution network 3. An example of a leveling index of water quality data at a plurality of points in the distribution pipe network 3 is shown in Expression (5). Equation (5) is an example of calculating the average deviation of the residual chlorine concentration per water demand using the average value of the residual chlorine concentration of the drawn water amount at the node shown in Equation (4). Formula (5) can calculate the dispersion | distribution with the average value of the residual chlorine concentration of the water distribution pipe network 3 in consideration of the water demand of the whole water distribution pipe network 3. FIG.

The smaller the leveling index MDp of the calculation result of Equation (5), the smaller the dispersion of the residual chlorine concentration on the water distribution network 3, and the smaller the difference in the residual chlorine concentration, which means a state close to leveling. Conversely, the greater the leveling index MDp, the greater the difference in residual chlorine concentration, which means that leveling is not being achieved. Here, an example is shown in which the average deviation is used to express the level of residual chlorine concentration, but in addition to the average deviation, an average value, a standard deviation, and the like can be used as well. Further, the leveling index calculation means 70 uses the equations (4) and (5) for the residual chlorine concentrations at a plurality of points transmitted from the sensors 4 and 5 and input by the pipe network data input means 30, for example. Thus, the level of the data obtained by measuring the residual chlorine concentration in the water distribution pipe network 3 can be evaluated.

Here, MDp: leveling index of residual chlorine concentration in distribution pipe network 3 [−], Cp: average value of residual chlorine concentration of withdrawal water amount [mg / L], Qpi: withdrawal water amount of node pi [m ³ / day ], Cpi: Residual chlorine concentration at node pi [mg / L], i: Node number (i = 1, 2, 3,... N)

  The optimal chemical injection amount calculation means 75 satisfies the water quality target value input by the water quality target value input means 51 and the level of the chemical injection calculated by the leveling index calculation means 70 is the most leveled chemical injection amount. In view of the operating state of the chemical injection device 6 input by the chemical injection device operating status input means 52, the chemical injection amount of the plurality of chemical injection devices 6 currently operating is set as the optimal chemical injection amount. When determining this optimal chemical injection amount, the chemical residual amount of the plurality of chemical injection devices 6 may be taken into consideration. Then, the determined optimal chemical injection amount is output to each chemical injection device 6.

≪Input means and screen≫
FIG. 2 is a diagram illustrating an example of a screen displayed by the water quality target value input unit according to the present embodiment. That is, an example in which the residual chlorine concentration target value is input by the water quality target value input means 51 is shown. Specifically, it is a screen 51a that is displayed on the display of the chemical injection control device 20 and that is input using a mouse or a keyboard.

  On this screen 51a, a lower limit target value, an upper limit target value, and an average target value (a plurality of water quality target values) of the pipe network residual chlorine concentration can be input. In this case, an effective target value can be selected by a check box. Here, the water quality target value input by the water quality target value input means 51 may be one of the lower limit target value, the lower limit target value and the upper limit target value, or any other combination. For example, by inputting the lower limit target value and the upper limit target value, the difference in residual chlorine concentration in the water distribution network 3 can be suppressed within a predetermined range. As the lower limit target value, for example, a reference value of residual chlorine concentration defined by the Waterworks Law may be input, or an original reference value of each water purification plant may be input. As the upper limit target value, for example, a residual chlorine concentration that can suppress the formation of by-products, a residual chlorine concentration that does not cause discomfort of water due to disinfection and sterilization, and the like may be input.

  As for the application of the water quality target value input by the water quality target value input means 51, the same target value may be used for the entire distribution pipe network 3, or a plurality of distribution pipe networks 3 may be used depending on the pipe diameter or the basin. Different target values may be used for each block. For example, the residual chlorine target value is set to the average target value because the fluctuation of the residual chlorine concentration is small in the watershed close to the reservoir 2 and having a large pipe diameter. On the other hand, for example, the residual chlorine concentration target value is set to the lower limit target value because the variation of the residual chlorine concentration is large in the basin having a small pipe diameter. Thus, it is possible to set a water quality target value according to the circumstances of each basin.

  FIG. 3 is a diagram illustrating an example of a screen displayed by the medicine injection device operating status input unit according to the present embodiment. That is, in this example, the operating status of the chlorine injecting device is input by the chemical injecting device operating status input means 52. Specifically, it is a screen 52a that is displayed on the display of the chemical injection control device 20 and that enables setting of a check box using a mouse or the like.

  On this screen 52a, four chlorine injection devices of A, B, C, and D machines are displayed, and three chlorine injection devices of A, B, and D machines are set to be operable by check boxes. The chemical injection device operating status input means 52 displays, for example, the chlorine injection device on the distribution pipe network 3 and its injection amount and the remaining chlorine amount on the screen 52a based on the pipe network database 35, and further, chlorine that can be operated at present. By setting the injection device, it is possible to grasp the operating status of a plurality of chlorine injection devices. This setting may be performed by an operator's operation or automatically according to a signal indicating the operating status of the chlorine injection device. According to this automatic setting of the chlorine injection device, for example, even when the chlorine injection device fails or is inspected, it can be quickly dealt with by excluding the chlorine injection device. In addition, as shown in FIG. 3, by presenting the injection amount of the chlorine injection device and the remaining amount of chlorine together, for example, even if the water demand varies, the chlorine injection amount that can be output by the chlorine injection device, It is possible to calculate the number of days that can be handled.

≪Device processing procedure≫
FIG. 4 is a flowchart showing a procedure for determining an optimum chlorine injection amount of a plurality of chlorine injection devices in the water distribution pipe network according to the present embodiment. This shows a procedure of processing executed by the chemical injection control device 20.

  In the chemical injection control device 20, first, the water quality target value input means 51 inputs the target value of the residual chlorine concentration (see step S1, FIG. 2). Next, the chemical injection device operation status input means 52 inputs the current operation status of the chlorine injection device (see step S2, FIG. 3). And the optimal chemical | medical agent injection quantity calculating means 75 sets each chemical | medical agent injection | pouring possible range (chlorine injection | pouring possible range) with respect to the some chemical injection apparatus 6 (step S3).

Specifically, for example, based on the target value of the residual chlorine concentration set by the water quality target value input means 51, the range of the chlorine injection rate of the chlorine injection device is 0.1, 0.2, 0.3, 0 .4, 0.5 [mg / L]. Further, for example, the minimum value and the maximum value of the injection amount of each chlorine injection device of the chemical injection device operating status input means 52 are substituted into Qm of the equation (6), and the flow rate of the chlorine injection device is set to Q of the equation (6). Substitute and set the range of chlorine injection amount. In addition, Formula (6) is an example when the chemical | medical agent used for a chlorine injection apparatus is liquid hypochlorous acid.

Here, R: chlorine injection rate [mg / L], Qm: injection amount of chlorine injection device [L / h], ε: hypochlorous density [ g / m ³ ], Q: flow rate [m ³ / h]

  In step S3, referring to the setting data of the water quality target value input means 51 and the chemical injection device operation status input means 52, the possible ranges of the chemical injection of the plurality of chemical injection devices 6 are set. A value may be set. In addition, the same chemical injection range may be used for a plurality of chemical injection devices 6, but the different chemical injection ranges are different for each chemical injection device 6 depending on the function of the chemical injection device 6 and the circumstances of the pipeline and the water distribution basin. May be used. In this way, by setting the chemical injection possible range of the chemical injection device 6, it is possible to prevent the computer from performing unnecessary calculations, thereby saving the calculation function of the computer and the memory used and shortening the calculation time. Can do.

  Subsequently, the optimal chemical injection amount calculation means 75 sets the chemical injection amount of the plurality of chemical injection devices 6 to be calculated based on the possible range of chemical injection of the plurality of chemical injection devices 6 set in step S3 ( Step S4). Specifically, for example, the chlorine injection amount to be calculated is set by combining the chlorine injection amounts of a plurality of chlorine injection devices.

  Then, the water quality calculation means 40 sets the chlorine injection amounts of the plurality of chlorine injection devices set in step S4 and the pipe network data (pipe length, pipe diameter, residence time, flow rate, flow direction) in the pipe network database 35. , Water temperature, water demand, etc.), for example, the residual chlorine concentration of the distribution pipe network 3 is calculated by the equations (1), (2), (3) (step S5). Subsequently, the leveling index calculating means 70 equalizes the residual chlorine concentration of the water distribution pipe network 3 by, for example, equations (4) and (5) with respect to the residual chlorine concentration of the water distribution pipe network 3 calculated in step S5. An index is calculated (step S6).

  Further, the optimum chemical injection amount calculating means 75 determines whether or not there is an uncalculated combination among the combinations of the chemical injection possible ranges (chlorine injection amounts) of the plurality of chlorine injection devices set in step S3 (step S3). S7). When there is a “combination of uncalculated chlorine injection amounts” (Yes in step S7), the process returns to step S4, and the chlorine injection amount is set so that “combination of uncalculated chlorine injection amounts” becomes a calculation target. In steps S5 and S6, the residual chlorine concentration and the leveling index of the water distribution pipe network 3 are calculated.

  Thus, by repeating steps S4, S5, and S6, the residual chlorine concentration and the leveling index can be calculated by combining the chlorine injection amounts of a plurality of chlorine injection devices. When there is no “combination of uncalculated chlorine injection amounts” (Yes in step S7), the calculation has been completed for all the combinations, and the process proceeds to step S8.

  Then, the optimum chemical injection amount calculating means 75 determines the optimal chlorine injection amount (step S8). Specifically, the leveling index calculated in step S6 is the smallest, and the water quality target value input in step S1 and the plurality of currently operating in view of the operating status of the chlorine injection device input in step S2 The chlorine injection amount of the chlorine injection device is the optimum chlorine injection amount. In addition, for example, the optimum chlorine injection amount considering the cost can be determined by adding the total chlorine injection amount of a plurality of chlorine injection devices to the target value. The optimal chlorine injection amount calculated in step S8 may be displayed on a display (CRT) as guidance, or may be transmitted to the water purification plant jurisdiction distribution network 100 to control the chemical injection device 6.

  According to the present embodiment described above, even when performing multipoint injection of chemicals using a plurality of chemical injection devices, it is possible to determine an optimal combination of chemical injection amounts that can achieve water leveling. It is possible to support the determination of appropriate operating conditions. Next, by calculating the leveling index from the statistical value of the water quality data calculated over a plurality of times, the accuracy of the leveling index can be improved. And by inputting a plurality of water quality target values, for example, the lower limit target value and the upper limit target value, and using them for the calculation of the chemical injection amount, it is possible to suppress the water quality disparity at each point of the distribution pipe network within a predetermined range. it can. Moreover, since the chemical injection amount is calculated using the availability of the plurality of chemical injection devices and the remaining amount of the chemical, it is possible to calculate an appropriate chemical injection amount in accordance with the operation status of each chemical injection device. Furthermore, it is possible to achieve water quality leveling and achievement of water quality target values by injecting chemicals at fewer points without injecting chemicals near each customer in the water distribution pipe network.

In addition to chlorine disinfection, there are methods such as ozone treatment and ultraviolet irradiation in addition to chlorine disinfection, but disinfection of a large amount of water such as tap water is easy to grasp the disinfection effect, sustainability, cost and residual amount. From this aspect, chlorination is widely used worldwide.
However, chlorine disinfection also has problems such as odor caused by disinfection, discomfort such as poor taste of water, and generation of disinfection by-products such as trihalomethane. In recent years, people's demand for water has changed from "quantity" commensurate with demand to "quality", such as seeking safer and more delicious water. For this purpose, a minimum chlorine injection amount is required.

On the other hand, with the progress of facility development, the scale of the pipe network has increased, and as a result, the decrease in residual chlorine concentration in the transmission and distribution process has increased, and the amount of chlorine injection has also increased, increasing the difference in residual chlorine concentration at the end of the distribution Has occurred. Therefore, in order to seek safer water of higher quality, it is essential to optimize and level the residual chlorine concentration on the pipe network. When considering the optimization and leveling of the residual chlorine concentration from the water distribution base to the end of the water distribution, as a countermeasure, in addition to the water purification plant, there is an additional injection of chlorine on the main distribution line. In reality, a relatively large water utility employs multi-point chlorine injection in the transmission and distribution system. However, when performing multi-point chlorine injection, the chlorine injection at the upstream side affects the chlorine injection at the downstream side, so in order to level the residual chlorine concentration in the pipe network, the chlorine injection at each chlorine injection point The combination of quantities must be managed appropriately.
In addition, considering the facility capacity of the chemical injection device, it is also important to maintain the terminal residual chlorine concentration at an appropriate value even if inspections and failures occur.
In this embodiment, it can respond to these.

  In the above embodiment, the example of the chemical injection control device for the water distribution pipe network of the water treatment plant has been described. However, the software or the software comprising the program (including the chemical injection control program for the pipe network) that realizes these functions on a computer. By using a recording medium (for example, a CD-ROM) storing software, the computer can be a chemical injection control device. Furthermore, by using the provided program, it is possible to expect proper operation, smooth operation, and efficiency improvement even for a business entity with few staff and professional engineers.

<< Other embodiments >>
An example of the preferred embodiment of the present invention has been described above, but the present invention is not limited to the present embodiment and can be appropriately changed without departing from the spirit of the present invention. The present embodiment is applied to the chlorine injection of the water distribution network 3 under the jurisdiction of the water purification plant. In addition to the chlorine injection, for example, an alkaline agent or an acid for leveling the pH of the water distribution network 3 is used. It can also be used for injection of chemicals, fluorine injection into clean water from the viewpoint of tooth decay prevention.

It is a figure which shows the structure of the chemical | medical agent injection | pouring control apparatus of the water purification plant which concerns on embodiment of this invention, and a water purification plant jurisdiction distribution pipe network. It is a figure which shows the example of the screen displayed by the water quality target value input means which concerns on embodiment of this invention. It is a figure which shows the example of the screen displayed by the chemical injection apparatus operating condition input means which concerns on embodiment of this invention. It is a flowchart which shows the procedure which determines the optimal chlorine injection amount of the some chlorine injection apparatus in the water distribution pipe network which concerns on embodiment of this invention.

Explanation of symbols

6 Chemical injection device 20 Chemical injection control device (Drug network chemical injection control device)
40 Water quality calculation means 51 Water quality target value input means 52 Chemical injection device operation status input means (operation status input means)
70 leveling index calculation means 75 optimum medicine injection amount calculation means (chemical injection amount calculation means)

Claims (13)

A chemical injection control device for a pipe network that outputs a chemical injection amount to a chemical injection device that injects chemicals into a water distribution pipe network,
Water quality target value input means for inputting a target value of the water quality of the water pipe network;
Water quality calculation means for calculating the water quality at a plurality of points of the water distribution pipe network from data on the water distribution pipe network itself and data of water flowing in the water distribution pipe network ;
Leveling index calculating means for calculating a water quality leveling index from the water quality calculated by the water quality calculating means;
A chemical that calculates the chemical injection amount of a plurality of chemical injection devices from the data including the water quality target value input by the water quality target value input means and the leveling index calculated by the leveling index calculation means, and outputs it to each chemical injection device Injection amount calculation means;
A chemical injection control device for a pipe network, comprising: The pipe network chemical injection control device according to claim 1, wherein the leveling index calculating means calculates a leveling index from statistical values of water quality at a plurality of points calculated by the water quality calculating means. The water quality target value input means inputs a plurality of water quality target values of the water distribution pipe network,
2. The chemical injection control device for a pipe network according to claim 1, wherein the chemical injection amount calculation means uses the plurality of water quality target values for calculation of a chemical injection amount. The chemical injection control device of the pipe network comprises an operation status input means for inputting an operation status including availability of the plurality of chemical injection devices and a remaining amount of the chemical ,
The chemical injection amount calculating means, based on the data of the operation status of the operation state input means inputs tube network according to claim 1, characterized in that for calculating the dosing amount of the chemical injection device Chemical injection control device. The water quality calculation means includes the flow rate, flow direction and residence time in the distribution pipe network calculated by pipe network calculation from the data of pipelines constituting the distribution pipe network, the amount of water supplied from the distribution base and the water demand. The chemical injection control device for a pipe network according to claim 1, wherein water quality in the water distribution pipe network is calculated using The chemical injection amount computing means satisfies a water quality target value input by the water quality target value input means, and a plurality of chemical injection devices in which the leveling index calculated by the leveling index calculation means is most leveled The chemical injection control device for a pipe network according to claim 1, wherein the chemical injection amount is a chemical injection amount. A chemical injection control method for a pipe network in a chemical injection control apparatus for a pipe network that outputs a chemical injection amount to a chemical injection apparatus for injecting chemicals into a water distribution pipe network,
A chemical injection control device for the pipe network,
A water quality target value input step of inputting a water quality target value of the water distribution pipe network;
A water quality calculation step for calculating water quality at a plurality of points of the water distribution pipe network from data on the water distribution pipe network itself and data of water flowing in the water distribution pipe network ;
And leveling index calculating step of calculating a leveling indication of water from the computed water,
A chemical injection amount calculation step for calculating a chemical injection amount of a plurality of chemical injection devices from the input water quality target value and data including the calculated leveling index, and outputting to each chemical injection device;
A chemical injection control method for a pipe network, comprising: The pipe network chemical injection control device comprises:
The pipe network chemical injection control method according to claim 7, wherein in the leveling index calculating step, a leveling index is calculated from statistical values of water quality at a plurality of points calculated in the water quality calculating step. The pipe network chemical injection control device comprises:
In the water quality target value input step, a plurality of water quality target values of the water distribution pipe network are input,
8. The chemical injection control method for a pipe network according to claim 7, wherein, in the chemical injection amount calculation step, the plurality of water quality target values are used for calculation of a chemical injection amount. The pipe network chemical injection control device comprises:
And further including an operation status input step of inputting an operation status including availability of the plurality of drug injection devices and a remaining amount of the drug ,
In the chemical injection amount calculation step, based on the data of the operating status entered in the operating status input step, the tube network according to claim 7, characterized in that for calculating the dosing amount of the chemical injection device Chemical injection control method. The pipe network chemical injection control device comprises:
In the water quality calculation step, the flow rate, flow direction, and residence time in the distribution pipe network calculated by pipe network calculation from the data of the pipelines constituting the distribution pipe network, the amount of water supplied from the distribution base and the water demand. The chemical injection control method for a pipe network according to claim 7, wherein water quality in the water distribution pipe network is calculated using The pipe network chemical injection control device comprises:
In the chemical injection amount calculation step, a plurality of chemical injection devices satisfying the water quality target value input in the water quality target value input step and the leveling index calculated in the leveling index calculation step being most leveled The chemical injection control method for a pipe network according to claim 7, wherein the chemical injection amount is a chemical injection amount. A pipe network chemical injection control program for causing a computer to execute the pipe network chemical injection control method according to any one of claims 7 to 12.

Images