JP2864797B2 - Intake well selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the operation and management of a water purification system having a plurality of intake wells as water sources, and more particularly to an apparatus for creating and modifying an intake well selection plan.

[0002]

2. Description of the Related Art Generally, some water purification systems have a surface water source (river) and a groundwater source (well) as water sources.
FIG. 5 shows an outline of this type of water purification system. 1 is a river, 2
Is a well (intake well). Each intake well 2 is provided with an intake pump 3. In the water purification plant 4, raw water taken in from the river 1 and the intake well 2 reaches the landing well 5 and is then sent to the floc formation pond 6. In the floc formation basin 6, flocculants are introduced to form flocs. Suspended components and impurities in the raw water are taken into the flocs. After this,
The floc is settled and separated in the sedimentation basin 7, further filtered in the filtration basin 8, and temporarily stored in the water purification basin 9. Then, the water is pumped from the water purification pump 9 to each of the distribution reservoirs 11 by the water transmission pump 10, and the water is distributed from the distribution reservoir 11 to the customers in each of the distribution zones. The filter pond 8 needs to be regularly washed and backwashed. The water used for washing is sent to the washing drainage pond 12, subjected to a sedimentation treatment, and then sent to the landing well 5.

[0003] Next, a description will be given of a water operation planning procedure for this type of water purification system. As shown in FIG. 6, first, the demand in each water distribution zone is predicted (S1). Although there are various demand amount prediction methods, basically, the daily demand amount is predicted, and thereafter, the demand amount in each hour unit is predicted from the daily demand amount. Next, in order to secure the amount of water distribution in each time unit, a plan for the amount of water to be stored in the reservoir 11 is made (S2), and the amount of water to be transmitted from the water purification tank 9 is determined based on the plan (S3). Further, a water intake plan for making this water supply possible is prepared (S4).

[0004] This water intake plan must be made under the following objectives and constraints. First, in order to ensure the deliciousness of water, it is necessary to effectively use well water and blend it with surface water. In addition, it is necessary to consider that a large amount of washing water (filtration water) is required to wash and backwash the filtration pond 8. In particular, when the daily average demand does not reach the amount of water necessary for washing the filter basin, such as at the beginning of operation, the water intake is temporarily changed to increase the amount of water in the water purification basin 9 and then to the filter basin 8.
Need to be cleaned. In addition, since the capacity of the water purification tank 9 is relatively small, the margin of operation is small, and it must be considered that the water purification tank 9 may overflow when a large amount of water is taken for a long time to wash the filtration tank 8. .
Under such constraints, it has been difficult to make a water intake plan in a short time every day.

Accordingly, the present applicant has filed Japanese Patent Application No. 1-116254.
Provides a method to support the creation of a water intake plan in the water purification plant management system. FIG. 7 shows the procedure for creating the intake plan. In this example, a preset water supply plan to the distribution reservoir, a cleaning plan for the filtration pond, and various information of each intake well are stored in the data memory, and the intake plan panel is displayed on the display to interactively plan the intake plan. The method of making the creation progress is adopted. FIG. 8 shows a water intake planning panel. The intake plan panel 13 includes a surface water intake plan column 14, an intake pump operation plan column 15, a water intake / water supply amount column 16, and a water purification tank water level column 17. The water intake amount / water supply amount column 16 displays the water supply amount and the required water amount at the time of cleaning the filter pond based on the water supply plan and the water purification tank cleaning plan. The surface water intake plan column 14 displays the priority of each intake pump. In the surface water intake plan column 14 and the intake pump operation plan column 15, the plan of the previous day is displayed at the start of the preparation of the intake plan. In general, the water intake plan does not change much from the previous day, so the plan for the day is revised and the plan for the day is created. Based on the plans displayed in the surface water intake plan column 14 and the intake pump operation plan column 15, the intake water amount and the water level of the water purification tank are simulated, and the results are displayed in the water intake / water transmission amount column 16 and the water purification tank water level column 17. Is done. Then, when the surface water intake plan column 14 and the intake pump operation plan column 15 are corrected, the display of the water intake amount and the water level of the clean water reservoir are changed in conjunction with the correction. The operator can prepare an intake plan while confirming the intake amount and the water level of the water purification reservoir.

[0006]

In this type of water purification system, the amount of spring water and the efficiency of water intake (electricity bill) differ in each intake well.
Also, not all intake wells are movable. For this reason, in preparing the intake pump operation plan, it is necessary to consider the intake capacity of each intake well, the original unit price (electricity fee for the intake volume), and the movable / inactive state.

In the above-mentioned intake plan creation support system, intake well information is prepared in advance in consideration of this point, so that the operator can refer to it when selecting an intake well, but depending on the scale of the water purification plant. There are many intake wells installed, and it was sometimes difficult to properly select the one to take water from in a short time. In addition, when an abnormality such as abnormally low water level occurs in the intake well, the operation plan of the intake pump must be changed, but it is difficult to change the plan in a short time.

[0008] Intake well information is not constant, for example, the amount of spring of each intake well fluctuates due to environmental changes such as seasons. In particular, when a large number of intake wells are installed, management of intake well information becomes complicated. For this reason, there was a problem that the current state of the intake well was not always accurately reflected in the intake pump operation plan.

In view of such problems, the present invention provides an apparatus for automatically creating (correcting) an intake well selection plan based on intake well information in operation management of a water purification system having a plurality of intake wells as water sources. It is another object of the present invention to provide a device for quickly and accurately managing intake well information.

[0010]

In the apparatus according to the first aspect of the present invention, referring to preset intake well information, an intake well selection plan per unit time is determined based on the planned amount of well water intake per unit time. Create and modify. When preparing an intake well selection plan, it shall be determined every hour whether or not the current intake well selection plan conforms to the well water intake plan amount for the day, and the intake well selection plan shall be revised for times that do not conform. By repeating this process, an intake well selection plan suitable for the well water intake plan is created.

That is, first, the well water intake amount estimating unit performs a simulation for a certain time based on the intake well selection plan and the available water intake amount of each intake well to obtain an estimated well water intake amount. Next, the discriminating unit determines whether the well water intake is within an allowable range (a range between the upper allowable value and the lower allowable value) determined based on the planned well water intake, and the estimated well water intake matches the planned well water intake. Check whether you are doing it. As a result, when the estimated well water intake is out of the allowable range, the intake well selection correction unit corrects the intake well selection plan based on the following criteria. If the estimated well water intake is larger than the allowable range, add the intake wells that are not used. The intake well to be added is selected based on the intake well information. In other words, candidates are listed in order of priority from the movable intake wells and are selected again so that the estimated well water intake amount falls within the allowable range. Conversely, if the estimated well water intake is smaller than the allowable range, the target intake well is excluded from the target. Intake wells to be removed are selected so that the estimated well water intake is within an allowable range in the order of lower priority.

Further, in the apparatus according to the second aspect, each of the intake wells is provided with various measurement / monitoring means, and the measurement result or the like is taken in periodically or when an alarm is received to update the intake well information. The well selection plan will be reviewed.

That is, a flow meter, a water level meter, and a wattmeter provided at each intake well measure the intake amount, water level, and pump driving power of each intake well, and the original intake unit calculation unit measures the intake amount and the measurement pump of each intake well. The original unit price is obtained from the driving power. Then, these data are periodically collected from each intake well by the intake well information correction unit, and the available intake amount and priority are corrected.
In particular, by modifying the priority based on the original unit price,
The total amount of electricity required for water intake can be reduced. The water level monitoring unit monitors the water level or changes in the water level. If the water level is out of the appropriate range, the water level monitoring unit recognizes that the water intake is inappropriate and issues an alarm. At the time of this warning, the intake well information correction unit corrects the movement / stop of the intake well information, and the well water intake amount estimation unit and discrimination unit, and the intake well selection correction unit operates to correct the intake well selection plan, A well selection plan excluding the intake well will be prepared. As a result, it is possible to manage and operate an intake plan reflecting the current state of each intake well.

[0014]

【Example】

1. Intake Well Selection Function The control system of the water purification system according to one embodiment of the present invention incorporates a predetermined intake planning function, particularly a function of automatically selecting an intake well. This function can be understood as a combination of the respective means shown in FIG. The intake well information storage unit 18 stores various conditions (intake well information) of each intake well. As shown in FIG. 2, the intake well information includes information such as an available water amount (m ³ / h), a water level (m), a use priority, and a determination as to whether the apparatus is in a movable state or a halt state. The well water intake storage unit 19 stores a well water intake table obtained from an intake plan table or a surface water intake table. The intake pump operation plan storage unit 20 stores an intake pump operation plan table. The well water intake amount estimating unit 21 simulates the well water intake amount at each time from the intake available amount and the intake pump operation plan. The determination unit 22 determines whether or not the estimated amount of well water intake at each time is within an allowable range by comparing the well water intake planned amount. Intake pump operation plan correction unit 23
Is to correct the intake pump operation plan when the estimated well water intake is outside the allowable range.

Next, the operation of this device will be described. FIG.
Shows a flow of automatic selection of an intake pump. Assuming that the planned intake amount of well water at a certain time is X and the allowable error in consideration of the margin of the water purification reservoir is Δ, the intake lower limit value X ₁ and the intake upper limit value X ₂ are X ₁ = X−Δ, X ₂ = X + Δ. Become. When the intake pump priority n and W _n, firstly, the water intake pump W _1, W ₂ ... to pick up the total of extractable amounts in accordance with the priority (S1,2), the total value Q _P is intake lower limit X ₁
(S3, 4). When the total value Q _P exceeds the intake limit value X ₁ (S3: Yes), in terms of the total value QP and it was confirmed that does not exceed the intake upper limit X ₂ (S5), picked-up intake pump W
Selecting ₁ to _W-P as the operation target (S6). If the total value Q _P exceeds the intake upper limit X ₂ , the intake pump W _P picked up last is removed and the next intake pump W
Pick up _{P + 1} and total the available water (S7,
8). Then, W is maintained until the total value R _J exceeds the water intake lower limit value X _{1.
P + 2} , W _{P + 3} ... Are sequentially picked up (S9, 10).
Thereafter, after confirming that the total value R _J does not exceed the water intake upper limit X ₂ (S11), the water intake pumps W _{1 to} W _P-1 ,
WP _{+ 1 to} WP _{+ J} are selected as operation targets (S12). At this time, if the total value R _J had exceeded the intake upper limit X _2, manual changes are performed (S13).

2. Intake well management function The control system according to this embodiment is also provided with a function of automatically managing intake well information. Each of the intake wells is provided with an intake well control device for controlling the intake water amount and the like. The host device collects various information transmitted from each intake well control device and manages the intake water amount information.

FIG. 4 shows an outline of the intake well control device. 2
Is an intake well and 3 is an intake pump. The water intake pump 3 is driven by a pump drive circuit (not shown) to pump water from a water intake well. The amount of water intake is controlled by adjusting the valve opening of the control valve 25 by the valve opening control circuit 24.

The intake well control device 26 takes in the water level of the intake well, the amount of intake water, and the power consumption of the intake pump 3 from the water level meter 27, the flow meter 28, and the power meter 29 at predetermined time intervals, and controls the valve opening degree and performs various operations. Perform calculations and the like. Valve control unit 30 in the intake well control device 26, the water level taken from the water level gauge 27 and H, Then the water level changes from H ₁ of H ₂ at time intervals T, so as to satisfy the following equation (1) Control the valve opening.

(H ₁ −H ₂ ) / T ≦ ΔH (1) where ΔH is a constant specific to each intake well. By controlling so as to satisfy this expression, the intake pump 3 can be operated within a range in which the water level does not extremely drop. In addition, the calculation unit 31 calculates the original unit price A _K and the available water amount B _K by performing the calculations of the equations (2) and (3) based on the taken flow rate V, water level H, and pump power K.

A _K = K / V (2) B _K = V (3) The original unit price A _K and the available water quantity B _K obtained in this way are transmitted to the host device by the communication control unit (not shown). To be transmitted. The host device updates the intake well information based on the received information. In this case, re-set the priority in accordance with the original unit price A _K.

Further, the water level of the intake well is constantly monitored by the water level monitor 32, and when the water level falls below the lower threshold value,
Alternatively, when the expression (1) is no longer satisfied, a water level alarm is transmitted to the host device. Upon receiving the water level warning, the host device corrects the determination of the movable / inactive state of the intake well to be inactive, reselects the intake pump by the intake well selection function, and operates the intake pump except for the intake well. Create In addition, when the number of intake wells is large, the frequency of use of intake wells with low priority is considered to be extremely low.In such a case, the intake pump with low use frequency should be periodically operated for a short time. It is also possible to adopt a mode of collecting intake well information.

[0022]

As described above, according to the present invention,
A well water intake amount is simulated based on intake well information, and an intake well selection plan is created based on the simulation result, thereby enabling automatic creation of an intake well selection plan. This makes it possible to draft an intake well selection plan in a short time in consideration of the intake well capacity and the original unit price of each intake well, thereby reducing the burden on the operator. In addition, there is an advantage that the change of the intake well during operation can be easily and promptly dealt with.

Further, predetermined information is collected for each intake well, the original unit price and the available intake amount are calculated, and the intake well information is periodically updated based on the result, and the water level and the water level change are monitored. Then, the movable / stop determination of the intake well information is corrected, thereby enabling automatic management of the intake well information. Therefore, not only can the work of updating the intake well information be omitted to reduce the burden on the operator, but also the situation of the intake well that fluctuates according to environmental changes can always be accurately grasped, and appropriate intake control can be realized. In particular, since the priority of each intake well is determined based on the original unit price and the intake well is selected according to this priority, there is an advantage that the amount of electricity in all the intake wells can be suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of an intake well selection function according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a water intake information table.

FIG. 3 is a flowchart showing an intake pump selection procedure.

FIG. 4 is a block diagram showing an outline of an intake well control device.

FIG. 5 is a block diagram showing an outline of a water purification system.

FIG. 6 is a flowchart showing a water operation planning procedure.

FIG. 7 is a flowchart showing a water intake plan creation support procedure.

FIG. 8 is an explanatory view showing a water intake planning panel.

[Explanation of symbols]

 2 ... intake well 3 ... intake pump 18 ... intake well information storage unit 19 ... well water intake amount storage unit 20 ... intake pump operation plan storage unit 21 ... well water intake amount estimation unit 22 ... determination unit 23 ... intake pump operation plan correction unit 27 ... water level meter 28 ... flow meter 29 ... power meter 30 ... valve control unit 31 ... calculation unit 32 ... water level monitoring unit

Claims (2)

(57) [Claims] 1. A control system for a water purification system for taking raw water from a water source including a plurality of intake wells, subjecting the raw water to water purification treatment, storing the raw water in a water purification reservoir, and sending water from the water purification reservoir to each distribution reservoir. In the apparatus for creating and correcting the intake well selection plan for each predetermined time based on the well water intake plan amount for each predetermined time, the items of the intake possible amount, the priority order, and the movable / pause determination for each intake well set in advance are set. The intake well information storage unit that stores the intake well information including the intake well information, the well water intake estimation unit that obtains the estimated well water intake amount for each predetermined time from the intake available amount of each intake well and the intake well selection plan, and the estimated well water intake amount A discriminator for discriminating whether or not the well water intake is within a permissible range based on a planned intake quantity, and operating according to the discrimination result of this discriminator and referring to the intake well information to correct the intake well selection plan; If the estimated intake amount of the intake water is larger than the allowable range, the movable intake well that is out of the target is added to the target according to the priority order.If the estimated intake amount of the well water is smaller than the allowable range, the target intake is removed. An intake well selection and correction unit that removes the intake well from an object to be used according to the order of lower priority. 2. A flow meter and a water level meter for measuring an intake amount and a water level of each intake well, a power meter for measuring a pump drive power of each intake well, and a measured water intake amount and a measurement pump drive power of each intake well. An original unit price calculation unit that calculates the original unit price, a water level monitoring unit that monitors the measured water level of each intake well and notifies an alarm when the water level or a change in the water level is out of the appropriate range, and various measurement results and the original unit price of each intake well This is to correct the intake well information at the time of regular collection and at the time of this periodic collection or at the time of receiving the warning, correct the intake possible amount based on the measured water intake amount, correct the priority based on the original unit price, and based on the warning And an intake well information correction unit that corrects the movable / stop determination by operating the well water intake amount estimating unit, the determination unit, and the intake well selection correction unit at least when an alarm is received to correct the intake well selection plan. When The intake well selection device according to claim 1, wherein