JPS5936060B2 - Automatic inflow adjustment method for water distribution reservoirs and water purification reservoirs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic inflow amount adjustment method for adjusting the amount of inflow water into water supply reservoirs, water treatment ponds, etc.

In general, the amount of water demanded for water distribution reservoirs and water purification reservoirs fluctuates depending on weather conditions such as season, weather, and temperature. Therefore, the amount of water flowing into the pond is regulated by an operator who constantly monitors the water level in the pond and closes the flow rate regulating valve when it approaches the upper limit of the operating water level, and opens it when it approaches the lower limit. In particular, automatic adjustment is not performed. However, in a situation where there is a shortage of manpower, it is desirable to automate this type of adjustment work, which requires experience and constant monitoring by an operator, as much as possible. However, even in the case of automation, simply detecting the water level and increasing the inflow amount when it approaches the lower limit, and decreasing it when it approaches the upper limit, means that the water level will reach the upper limit when the water demand increases. It may also be necessary to reduce it because it was close to .

Therefore, if the amount is increased again in a hurry, the adjustment equipment will have to be operated many times, shortening the life of the equipment and causing unstable operation. The present invention provides an automatic inflow adjustment method for water distribution reservoirs, water purification ponds, etc., which determines the inflow amount based on the water level and water demand, and reduces the number of operations of adjustment equipment to operate the pond stably. The purpose is to The present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, reference numeral 1 indicates a water distribution reservoir, the water level of which is detected via a water level detector 2. Reference numeral 3 denotes a water pipe, 4 a pump, 5 a pump controller for controlling a driving motor of the pump 4, and 6 an electric valve whose opening degree is adjusted by an electric valve regulator 1.

8 is a clock that measures time.

9 is a central processing unit that includes a storage section 11, a calculation section 12, and a control section 1.
3. Input/output section 14 and data conversion sections 15a and 15b
In other words, the actual measured value of the water level in the water distribution reservoir 1 sent from the water level detector 2 is input, the necessary calculations are performed, and a control command is outputted via the pump controller 5 and the electric valve regulator 7. The pump 3 and the electric valve 6 are controlled.

In the above case, when a water purification pond is targeted, a filtration basin or the like is arranged in place of the pump 4, so a control device for the filtration basin is provided in place of the pump controller 5.

In implementing the present invention, it is necessary to clarify the following matters at the design stage.

That is, the following three points will be explained using the case of a water distribution reservoir as an example: (a) standard adjustment time, (predicted water demand amount) (predicted outflow amount), and (c) allowable water level range. First, the standard adjustment time is determined as follows.

If it is an existing water distribution reservoir, the outflow water volume value at one point per hour is recorded in the normal operation log, so this record is used. If it is a newly constructed water distribution reservoir, you may choose similar existing equipment and use its operation log records. However, in this case, it is necessary to modify this record at the beginning of operation to make it unique to that reservoir. When the water demand curve for one point per hour is obtained in this way, a water demand variation curve for 24 hours a day is created. Although this curve varies considerably depending on factors such as the weather, it can be obtained in the form shown in Figure 2 by applying statistical processing. Next, find the extreme value of this curve, calculate the midpoint between adjacent extreme values, and set that point as the standard adjustment time. In the case of Fig. 2, the number of extreme values is 4, and considering that the curve of one day is continuous with the next day and the next day, the standard adjustment time is 5 points including the start time of the day. Normally, no adjustment is made at times other than this time, and the average value of the water demand at this time interval is used as the predicted water demand from one standard adjustment time to the next time. In the case of FIG. 2, five points can be obtained for this predicted water demand, which is equal to the number of standard adjustment times. By doing this, the number of adjustments is 1
Adjust the rope several times a day and every few hours. However, if nothing is done until the next standard adjustment time, it is dangerous because the predicted value is used as the demand water amount and it is not possible to know how the water level is changing.

To compensate for this, water level detection is performed several times per hour, and if the water level is within an allowable range at that time, no adjustment operation command is issued. This range is obtained by substituting the water level detection value at the standard adjustment time into the calculation formula. The shaded area in FIG. 3 shows the permissible water level range obtained in this way. The above are the matters that should be clarified at the design stage. Next, these operations will be explained.

If a pump is placed before the distribution reservoir in the three ponds determined in the above design stage, the target system data includes the number of pumps and their unit discharge amount (number control) or the maximum and minimum pump discharge amount. The value is written into the storage unit 11 of the central processing unit 9. The water level of the water distribution reservoir 1 is detected by the water level detector 2 at regular time intervals and inputted to the data converter 15b of the central processing unit 9. At this time, the central processing unit 9 receives a signal sent from the clock 8, confirms the time, and confirms that the water level is within the permissible water level range if it is not the adjustment time. However, if the water level is within the acceptable range, do not make any adjustments and record as necessary.

If it is outside the allowable range, the adjustment is made even if it is not the standard adjustment time. That is, the water level adjustment amount is divided by the number of time intervals from the detection time to the next standard adjustment time. Then, the calculation unit 12 adds this result value and the predicted water demand value written in the storage unit 11 to obtain the inflow rate setting value of the water distribution reservoir 1. This inflow rate set value is sent to the data converter 15 via the input/output section 14.
Enter a. As a result, the data converter 15a outputs an inflow amount setting command to operate the electric valve regulator 7, thereby operating the electric valve 6. At this time, it is also confirmed that the pump 4 has a value that allows it to supply water. If pump 4 is controlled in number,
When an intermediate value that does not allow water to be pumped is calculated as the inflow amount setting value, this value is corrected to a value quantized by the nearest possible pump unit discharge amount. In this way, the water level is detected several times per hour, and adjustments are made once every few hours, so that the water distribution reservoir 1 is operated stably.

The operation is exactly the same in the case of a water purification pond.

That is, in this case, as a system configuration, there is equipment such as a filtration pond before the water purification pond on the inflow side corresponding to the pump 4. On the outflow side, the inflow into the reservoir 1 corresponds to the water demand, and when there are multiple reservoirs, the inflow is the sum of the inflows or the natural flow and the inflow into the reservoir. Therefore, in the case of a water purification pond, it is best to carry out calculations regarding the above-mentioned different points at the design stage.

However, since the outflow amount was different, it was necessary to modify the number of adjustments. The correction in this case is necessary because the daily water demand curve is created from the sum of multiple water transmission pipes, so the number of extreme values may increase considerably. The extreme values are selected so that they can be treated in the same way as . In other words, a predicted water demand curve is created and then the center point of the extreme value is determined. However, since this may require a considerable number of adjustments, it is necessary to exclude those where the interval between adjacent extreme values is narrow and the extreme value changes are small. Add.
As a result, in the case of a water purification reservoir, the adjustment times are determined several times a day, as in the case of the water distribution reservoir. As described above, according to the present invention, the adjustment of the pond water level is automated, which saves the labor of the operator, and the number of adjustments is reduced, so deterioration of operating equipment can be reduced, which has great effects. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a control system configuration diagram for a water distribution reservoir, Fig. 2 is a demand water amount change curve diagram,
Figure 3 is a water level permissible range diagram. 1...Water reservoir, 2...Water level detector, 3...Water pipe, 4...Pump, 5...Pump controller, 6...Electric valve, T...Electric valve regulator , 8...clock, 9...
central processing unit, 11... storage unit, 12... calculation unit,
13... Control unit, 14... Input/output unit, 15a, 15
b...Data converter.

Claims (1)

[Claims] 1 Create a 24-hour water demand change curve per day from past data for water supply reservoirs and water purification reservoirs, find each extreme value on the curve, calculate the midpoint of these adjacent extreme values, and calculate each point. is the standard adjustment time for the inflow of the above-mentioned water distribution reservoirs and water purification reservoirs, and the inflow is calculated from two factors: the predicted water demand amount and the water level adjustment water amount to bring the water level to the intermediate level, and the inflow is calculated at the standard adjustment time. The system is characterized by comprising means for adjusting the amount of inflow to the water distribution reservoir or water purification reservoir, and means for actually measuring the water level of the water distribution reservoir or water purification reservoir and adjusting the amount of inflow only when the water level is outside a certain allowable range. Automatic inflow adjustment method for water distribution reservoirs and water purification reservoirs.