JP4739293B2 - Rainwater pump control device - Google Patents

Description

  The present invention relates to a control device for a storm water pump in a sewerage facility, and particularly predicts the amount of rainwater inflow flowing into a pump station or a sewage treatment plant, The present invention relates to a rainwater pump control device for controlling the timing of stopping.

  Conventionally, rainwater pumps have been controlled to drain rainwater so that surrounding watersheds, pumping stations and sewage treatment plants are not flooded. Moreover, not only inundation measures in recent years, but also in order to preserve the water quality at the discharge destination, a rainwater storage pond, the effective use of rainwater stored in the sewer pipe, and a simple rainwater treatment facility have been established. The operation of reducing the amount of rainwater discharged directly into rivers and the sea and reducing the contamination of the discharged rainwater is being carried out, and pump control is utilized in such facilities.

  In particular, in combined sewerage facilities where both sewage and rainwater flow in, not only inundation countermeasures but also operation of rainwater pumps for adjusting the discharge flow rate and reducing the pollution of discharged water is required. .

  Since rainwater at the beginning of rainfall has a high pollution concentration, direct discharge pumps, which are rainwater pumps that are discharged directly into rivers, oceans, etc., do not start immediately unless the inflow volume increases rapidly and there is a risk of inundation. The effluent water is started by starting a so-called simple processing pump for water supply to the rainwater reservoir or by starting the direct discharge pump after the simple discharge starts or after the rainwater reservoir is full. Can reduce pollution.

  The control of a conventional storm water pump that takes into account the amount of pipe storage, predicts the amount of rainwater inflow, and based on the predicted amount of rainwater inflow and the water level data in the pipe, the predicted amount of storage in the pipe when there is no pump operation If the predicted amount of pipe storage becomes greater than the target value of pipe storage determined in advance, the number of pumps operated and the number of rotations are controlled using the predicted amount of rainwater inflow as the target drainage amount of the pump. is there.

  In this case, the number of pumps to be operated is determined in advance with respect to the target amount of drainage, and pumps are selected and operated based on a predetermined start / stop order. In addition, the pipe storage target value is determined according to the mode by performing mode determination such as heavy rain and light rain based on the predicted total precipitation up to a certain time (see Patent Document 1).

JP-A-9-62367

  In conventional rainwater pump control, the number of pumps operated is directly affected by fluctuations in the predicted inflow rate, so if the predicted inflow rate suddenly increases or decreases due to rainfall conditions, additional pump operation is performed. The pump will stop after a short time, or multiple pumps may be operated or stopped in a short period of time, resulting in unstable pump operation. There was a problem.

  In addition, since the target drainage volume is determined without distinguishing between the direct discharge pump and the simple treatment pump, even if the operation order of the simple treatment pump is higher than that of the direct discharge pump, if the inflow rate increases rapidly, The direct discharge pump is often operated immediately after the pump is operated or after a short time, and the direct discharge pump is operated before the simple treatment is started in a simple treatment facility and the discharged water is polluted. There was also a problem that it was not possible to sufficiently prevent this.

  The present invention has been made to solve the above-described problems, and can reduce the contamination of discharged water, and there is no fear of inundation, and additional operation and stoppage do not occur in a short time. An object of the present invention is to provide a rainwater pump control device capable of operating a stable rainwater pump. Moreover, it aims at providing the rainwater pump operating method suitable for this rainwater pump control apparatus.

  The rainwater pump control device according to the present invention does not go through a simple treatment pump and a simple treatment facility that drains rainwater flowing through a sewer pipe and flowing into a pump station or a sewage treatment facility through the simple treatment facility. It controls the rainwater pump, which is one of the direct discharge pumps that drains water, from the rainwater inflow prediction section that predicts the amount of rainwater inflow up to a predetermined time based on rainfall data, and the water level of the facility into which rainwater flows The storage capacity calculation unit that calculates the storage volume of the storage facility, and the target upper limit storage volume and the target lower limit storage volume of the storage facility for each of the simple processing pump and the direct release pump. For each of the target storage amount calculation unit that calculates to be small, the simple processing pump, and the direct release pump, the storage amount of the storage facility reaches the target after the predetermined target storage amount arrival time. Necessary pumping amount calculation unit that calculates the required minimum pumping amount of the rainwater pump that becomes the storage amount and the required maximum pumping amount that becomes the target lower limit storage amount in consideration of the inflow of rainwater, and a pump that controls the operation and stoppage of the rainwater pump The pump operation stop calculation unit is already operating the maximum pumping amount total value that is the sum of the maximum pumping amount of the operating rainwater pump and the minimum pumping amount total value that is the sum of the minimum pumping amount. It is calculated that only the storm water pump is operated, and it is determined that additional operation of the simple treatment pump is necessary when the total maximum pumping amount is smaller than the minimum required pumping amount for the simple treatment pump. The simple processing pump that is not in operation is started until the first insufficient pumping amount, which is the value obtained by subtracting the total maximum pumping amount from the minimum required pumping amount, is negative. The maximum total pumped amount is calculated by including it in the rainwater pump, and when the maximum total pumped amount becomes smaller than the minimum required pumped amount for the direct discharge pump, it is determined that additional operation of the direct discharge pump is necessary. Until the second deficient pumping volume, which is the value obtained by subtracting the total maximum pumping volume from the minimum required pumping volume for the discharge pump, is negative, start the direct discharge pump that is not operating, Calculate the total amount of minimum pumped water included in the operating rainwater pump, and when the minimum total pumped amount becomes larger than the required maximum pumped amount for the direct discharge pump, it is determined that additional stoppage of the direct discharge pump is necessary. The direct discharge pump that is in operation is stopped until the first excess pumping amount, which is the value obtained by subtracting the required maximum pumping amount for the direct discharge pump from the total minimum pumping amount, is negative. Rainwater pump to drive The total minimum pumping amount is calculated, and when the minimum total pumping amount becomes larger than the necessary maximum pumping amount for the simple processing pump, it is determined that the additional stoppage of the simple processing pump is necessary. The simple processing pump in operation is stopped until the second excess pumping amount, which is a value obtained by subtracting the necessary maximum pumping amount for the simple processing pump from the value, becomes negative.

  According to the rainwater pump control device according to the present invention, the rainwater flowing through the sewer pipe and flowing into the pump station or the facility of the sewage treatment plant is drained via the simple treatment facility and the simple treatment facility. A rainwater pump, which is one of the direct-discharge pumps that drain without draining, and a rainwater inflow forecasting unit that predicts the amount of rainwater inflow up to a predetermined time based on rainfall data, and a facility that receives rainwater The storage amount calculation unit that calculates the storage amount of the storage facility from the water level, the target upper limit storage amount and the target lower limit storage amount of the storage facility for each of the simple processing pump and the direct release pump, and those related to the simple processing pump relate to the direct release pump For each of the target storage amount calculation unit that calculates to be smaller than the target storage amount, the simple processing pump, and the direct release pump, the storage amount of the storage facility after the predetermined target storage amount arrival time The required pumping amount calculation unit that calculates the required minimum pumping amount of the rainwater pump that will be the upper limit storage amount and the required maximum pumping amount that will be the target lower limit storage amount in consideration of the amount of rainwater inflow, and the operation and stoppage of the rainwater pump are controlled A pump operation stop calculation unit, and the pump operation stop calculation unit has already obtained a maximum pumping amount total value that is the sum of the maximum pumping amount of the operating rainwater pump and a minimum pumping amount total value that is the sum of the minimum pumping amount. It is calculated that only the rainwater pump in operation is operated, and it is determined that additional operation of the simple processing pump is necessary when the total maximum pumping amount is smaller than the minimum required pumping amount for the simple processing pump. The simple processing pump that is not in operation is started until the first insufficient pumping amount, which is a value obtained by subtracting the total maximum pumping amount from the minimum required pumping amount, becomes negative. Including the storm water pump that operates, calculate the maximum total pumped amount, and when the maximum total pumped amount becomes smaller than the minimum required pumped amount for the direct discharge pump, it is determined that additional operation of the direct discharge pump is necessary. Rainwater that starts the operation of the direct release pump that is not in operation until the second insufficient pumping amount, which is the value obtained by subtracting the total maximum pumping amount from the required minimum pumping amount for the direct release pump, becomes negative Calculate the total amount of minimum pumped water included in the rainwater pump that operates the pump, and determine that additional stoppage of the direct discharge pump is necessary when the minimum total pumped amount becomes larger than the required maximum pumped amount for the direct discharge pump. The direct discharge pump that is in operation is stopped until the first excess pumping amount, which is the value obtained by subtracting the required maximum pumping amount for the direct discharge pump from the total minimum pumping amount, is negative. Rainwater pump driving the pump The minimum pumped amount is calculated by removing the pump from the pump, and when the minimum pumped total value becomes larger than the required maximum pumped amount for the simple processing pump, it is determined that the additional simple processing pump needs to be stopped. Since the simple treatment pump was stopped until the second excess pumping amount, which is the value obtained by subtracting the required maximum pumping amount for the simple treatment pump from the total value, became negative, the polluted water was discharged. Stable pump operation without the risk of flooding is possible while preventing this from occurring.

Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a rainwater pump control apparatus installed in a sewage treatment plant according to Embodiment 1 of the present invention. In the figure, rainwater flowing into a pump well 4 through a sewage pipe 1 is directly connected. In order to control the pump in a sewage treatment plant where the water is discharged directly to the river by the discharge pump 8 or is sent to the simple treatment facility 9 by the simple treatment pump 7 and then subjected to simple treatment such as sedimentation treatment and then discharged to the river. In addition, the rainwater pump control device 30 is used.

  The pump well 4 is provided with a plurality of direct discharge pumps 8 for directly discharging rainwater to the river and a plurality of simple treatment pumps 7 for supplying water to the simple treatment facility 9. In addition, an inflow dredging water level meter 11 is installed in the inflow dredger 2, a pump well level meter 12 is installed in the pump well 4, and a rain gauge 10 for measuring rainfall is further installed.

  The rainwater pump control device 30 predicts the amount of rainwater flowing into the sewage treatment plant based on the rainfall data up to a predetermined time based on the signals from the rain gauge 10, the inflow water level gauge 11 and the pump well water level gauge 12. The target upper limit storage amount and the target lower limit storage amount of the rainwater inflow amount prediction unit 20, the in-pipe storage amount calculation unit 21 for calculating the current in-pipe storage amount, and the direct discharge pump 8 and the simplified processing pump 7 are calculated. For the target storage amount calculation unit 22 and the storage amount in the sewage treatment plant to obtain the pumping amount of the pump necessary for the target upper limit storage amount and the target lower limit storage amount in the preset target storage amount arrival time. A required pumping amount calculation unit 23 for calculation and a pump operation stop calculation unit 24 for determining whether to operate or stop the pump.

  And the rainwater pump control apparatus 30 controls operation | movement of the simple process pump 7 and the direct discharge pump 8 so that a storage amount is controlled between the said target upper limit storage amount and a target lower limit storage amount.

  Next, the operation will be described. The inflow amount prediction unit 20 inputs the rainfall data from the rain gauge 10, the inflow water level measured by the inflow pipe water level meter 11, and the pump well water level data measured by the pump well level meter 12. In consideration of changes in the amount of storage in the sewage pipe basin 1, inflow basin 2, sand basin 3 and pump well 4, the inflow of storm water flowing into the pump station and sewage treatment plant is expressed at unit time intervals (for example, every minute). , Predict from now until a certain time. As a method for predicting the inflow amount, a commonly used tank model, modified RRL method, ARMA model, or the like is used.

  The storage amount calculation unit 21 determines the storage amount of each of the sewer pipe 1, the inflow dredge 2, the sand basin 3, and the pump well 4 constituting the storage facility from the data of the current water level of the inflow dredge 2 and the water level of the pump well 4. To calculate the current in-pipe storage.

  However, the storage amount in the sewer pipe 1 is calculated based on the current water level of the inflow trough 2, and the storage amount in the inflow trough 2 is calculated based on the current water level of the inflow water level. Furthermore, the storage amount in the sand basin 3 and the pump well 4 is calculated based on the current water level of the pump well 4.

  The target storage amount calculation unit 22 calculates the target upper / lower limit storage amount of the simple processing pump 7 and the target of the direct release pump 8 from the target upper / lower limit water level of the simple processing pump 7 and the target upper / lower limit water level of the direct release pump 8 set in advance. Obtain the upper and lower limit storage volume.

  The target upper limit water level of the simple processing pump 7 is a direct discharge pump so that the normal processing pump 7 is operated in normal rain and the discharge by the direct discharge pump 8 is started after being simply discharged in the simple processing facility 9. 8 is set lower than the target upper limit water level. In addition, the target lower limit water level of the simple processing pump 7 is set lower than the target lower limit water level of the direct discharge pump 8 so that the direct discharge pump 8 stops earlier than the simple processing pump 7.

  In the required pumping amount calculation unit 23, the predicted inflow amount obtained by the rainwater inflow amount prediction unit 20, the current storage amount obtained by the storage amount calculation unit 21, and further the simple processing pump 7 obtained by the target storage amount calculation unit 22. As shown in the following formulas (1) to (4) from the target upper and lower limit storage amount and the target upper and lower limit storage amount of the direct discharge pump 8, the target upper limit storage amount and the upper limit storage amount arrival time in which the storage amount is set in advance. Necessary minimum pumping amount per unit time necessary to become (for example, every minute) and per unit time necessary to reach the target lower limit storage amount with a preset lower limit storage amount arrival time (for example, every minute) The required maximum pumping amount is obtained individually for the simple processing pump 7 and the direct discharge pump 8.

Q1req_min (t) = Qin (t) + (V (0)-VH1) / TH1 (1)
Q1req_max (t) = Qin (t) + (V (0)-VL1) / TL1 (2)
Q2req_min (t) = Qin (t) + (V (0)-VH2) / TH2 (3)
Q2req_max (t) = Qin (t) + (V (0)-VL2) / TL2 (4)
here
t: predicted time, taking the current time as 0 and taking values up to the predicted time T. That is, 0 ≦ t ≦ T and the predicted time T is predetermined for each system.
Q1req_min (t), Q1req_max (t): Required minimum pumping amount or required maximum pumping amount per unit time of the simple processing pump 7 at time t
Q2req_min (t), Q2req_max (t): Required minimum pumping amount or required maximum pumping amount per unit time of direct discharge pump 8 at time t
Qin (t): Estimated inflow after t hours
V (0): Current storage volume
VH1: Target upper limit storage amount of the simple processing pump 7
VL1: Target lower limit storage amount of simple processing pump 7
VH2: Target upper limit storage amount of direct release pump 8
VL2: Target lower limit storage amount of direct release pump 8
TH1: Target upper limit storage amount arrival time of the simple processing pump 7
TL1: Target lower limit storage amount arrival time of the simple processing pump 7
TH2: Target upper limit storage amount arrival time of direct release pump 8
TL2: Target lower limit storage amount arrival time of direct release pump 8

  That is, the simple processing pump 7 or the direct discharge pump 8 is newly operated with respect to the pump currently being operated (operated continuously from before) to adjust the storage amount within the range of the target upper and lower limit storage amount. To do. As long as the pump pumping amount at each predicted time t is within the range of the required maximum pumping amount and the required minimum pumping amount, the storage amount does not exceed the upper limit storage amount or the lower limit storage amount within the target arrival time.

For example, assuming that the pump pumping amount at each predicted time t is the same as the minimum required pumping amount of the simple processing pump 7, the storage amount V (t) at the time t is obtained by the following equation from the equation (1).
V (t) = V (0) + Σ (Qin (t) −Q1req_min (t)) / TH1 = V (0) − ((V (0) −VH1) / TH1) × t (5)
However, Σ is an addition from k = 0 to t.
Therefore, if the current storage amount is less than or equal to the target upper limit value, that is, V (0) ≦ VH1, it will not exceed VH1 within TH1 time.

  Increasing the target upper limit storage amount arrival time TH1, TH2, for example, in equation (1), the denominator TH1 increases, and the difference between the inflow amount Qin (t) and the pumped amount Q1req_min (t) decreases, If the target upper limit storage amount arrival times TH1 and TH2 are equal to the predicted time T, the storage amount at the predicted time T becomes the target upper limit storage amounts VH1 and VH2.

  Similarly, if the target lower limit storage amount arrival times TL1 and TL2 are equal to the predicted time T, the storage amount at the predicted time T becomes the target lower limit storage amounts VL1 and VL2. FIG. 2 is a diagram showing the relationship between time t and each required pumping amount and storage amount. In the figure, each target storage amount arrival time TH1, TH2, TL1, TL2 is shown to be set equal to the predicted time T. Yes.

  In FIG. 2, the difference between the minimum required pumping volume Q1req_min (t) of the simple processing pump 7 and the minimum required pumping volume Q2req_min (t) of the direct discharge pump 8 is obtained by the formula (1)-(3), and TH1 Since = TH2 = T, the difference is (VH2-VH1) / T. Similarly, the difference between the required maximum pumping amount of the simple processing pump 7 and the required maximum pumping amount of the direct discharge pump 8 is obtained as (VL2−VL1) / T.

  As shown in FIG. 2, the required minimum pumping amount (a) of the simple processing pump 7 is less than the required minimum pumping amount (c) of the direct discharge pump 8, as shown in FIG. The required maximum yield (i) of the simple processing pump 7 is larger than the required maximum yield (d) of the direct discharge pump 8.

  FIG. 3 is a flowchart showing a process for determining whether or not to operate the pump, and FIG. 4 is a flowchart showing a process for determining whether or not to stop the pump. In the pump operation stop calculation unit 24, the required maximum pumping amount and the required minimum pumping amount of the simple processing pump 7 and the direct discharge pump 8 obtained by the required pumping amount calculation unit 23, and the total minimum pumping amount of the pump that has already been operated. When the required minimum yield is greater than the maximum total yield, a new pump activation decision is made, and when the required maximum yield is less than the minimum yield, Determine whether to stop the pump.

  The minimum pumping amount total value and the maximum pumping amount total value are the total value of the maximum pumping amount and the total value of the minimum pumping amount of the pump operated at a certain time. The maximum pumping volume and the minimum pumping volume for each pump unit are set in advance, and the maximum pumping volume and the minimum pumping volume are the same for fixed speed pumps.

  In FIG. 3, in STEP 301, the total value of the maximum pumping amount and the minimum pumping amount of the pump currently in operation is obtained at time t = 0, without distinguishing between the simple processing pump 7 and the direct discharge pump 8. This means that the maximum total yield and the minimum total yield are calculated assuming that only the rain pump that is already in operation is operated. Next, in STEP 302, if the time t is within the predicted time T, the process proceeds to STEP 303. If the time t exceeds the predicted time T, the operation stop determination is terminated.

  In STEP303, it is determined whether or not the necessary minimum pumping amount of the simple processing pump 7 at time t is larger than the total maximum pumping amount. If it is larger, STEP304 is performed to perform additional operation of the simple processing pump 7 and must be larger. If it is determined that no additional operation is to be performed, the process proceeds to STEP 401 additional stop determination in FIG.

  In STEP 304, the insufficient pumping amount 1 (first insufficient pumping amount) of the simple processing pump 7 is obtained by subtracting the pump maximum pumping amount total value from the necessary minimum pumping amount of the simple processing pump 7. Next, in STEP 305, the simple processing pump 7 that can be additionally operated is selected, and the value obtained by subtracting the maximum yield of the unit selected for additional operation from the insufficient yield 1 is defined as the insufficient yield 1.

  The simple processing pump 7 is additionally operated until the insufficient pumping amount 1 ≦ 0 so that the pumped pumping amount at the time point t can be operated at the minimum required pumping amount of the simple processing pump 7 or more. For the selected pump, a start command is output so that the insufficient pumping amount 1 can be secured at time t in consideration of the start time.

  Next, in STEP 306, a value obtained by adding the total value of the minimum pumping amount of the additionally operated unit to the minimum pumping amount total value is again set as the minimum pumping amount total value after time t. In addition, a value obtained by adding the total value of the maximum pumping volume of the unit that has been additionally operated to the maximum pumping volume total value will be the new maximum pumping volume total value after time t.

  Next, in STEP307, it is determined whether or not the necessary minimum pumping amount of the direct discharge pump 8 is larger than the maximum pumping amount total value at time t. If larger, the process proceeds to STEP308 to perform additional operation of the direct discharge pump 8, Otherwise, it is determined that the additional operation is not performed, and the process proceeds to STEP 401 additional stop determination in FIG.

  In STEP 308, the shortage pumping amount 2 (second shortage pumping amount) of the direct discharge pump 8 is obtained by subtracting the total maximum pumping amount from the necessary minimum pumping amount of the direct discharge pump 8. Next, in STEP 309, the direct discharge pump 8 that can be additionally operated is selected, and the value obtained by subtracting the maximum yield of the unit selected for additional operation from the insufficient yield 2 is defined as the insufficient yield 2.

  The direct discharge pump 8 is additionally operated until the insufficient pumping amount 2 ≦ 0, so that the pumped pumping amount at the time t can be operated at the required minimum pumping amount or more. For the selected pump, a start command is output so that the insufficient pumping amount 2 can be secured at time t in consideration of the start time.

  Next, in STEP 310, a value obtained by adding the total value of the minimum pumping amount of the additionally operated unit to the minimum pumping amount total value is set as the minimum pumping amount total value after time t. In addition, a value obtained by adding the total value of the maximum pumping volume of the unit that has been additionally operated to the maximum pumping volume total value will be the new maximum pumping volume total value after time t.

  Next, in STEP 401 in FIG. 4, it is determined whether or not the necessary maximum pumping amount of the direct discharge pump 8 at time t is smaller than the total minimum pumping amount. If it is smaller, the process proceeds to STEP 402 to additionally stop the direct discharge pump 8. If it is not smaller, it is determined that there is no additional stop and the process proceeds to STEP409. In STEP402, the excess pumping amount 2 (first excess pumping amount) of the direct discharge pump 8 is obtained by subtracting the required maximum pumping amount of the direct discharge pump 8 from the total minimum pumping amount.

  Next, in STEP403, a pump to be stopped from the direct discharge pump 8 in operation is selected, and a value obtained by subtracting the minimum pumping amount of the unit selected to be additionally stopped from the excessive pumping amount 2 is set as the excessive pumping amount 2. The direct discharge pump 8 is additionally stopped until the excess pumping amount 2 ≦ 0 so that the pumped pumping amount at the time t can be operated below the required maximum pumping amount of the direct discharging pump 8.

  Next, in STEP 404, a value obtained by subtracting the total value of the minimum pumping amount of the additionally stopped unit from the minimum pumping amount total value is again set as the minimum pumping amount total value after time t. In addition, the value obtained by subtracting the total value of the maximum yield of the additional units that have been suspended from the total maximum yield is the new maximum yield after t.

  Next, in STEP 405, it is determined whether or not the necessary maximum pumping amount of the simple processing pump 7 at time t is smaller than the total minimum pumping amount, and if it is smaller, the process proceeds to STEP 406 in order to additionally stop the simple processing pump 7. If not, it is determined that there is no additional stop and the process proceeds to STEP409.

  In STEP 406, the excess pumping amount 1 (second excess pumping amount) of the simple processing pump 7 is obtained by subtracting the required maximum pumping amount of the simple processing pump 7 from the total minimum pumping amount. Next, in STEP 407, a pump to be stopped is selected from the simple processing pump 7 in operation, and the value obtained by subtracting the minimum pumping amount of the unit selected to be additionally stopped from the excessive pumping amount 1 is set as the excess pumping amount 1.

  The simple processing pump 7 is additionally stopped until the excess pumping amount 1 ≦ 0 so that the pumped pumping amount at the time t can be operated below the required maximum pumping amount of the simple processing pump 7. Next, in STEP 408, a value obtained by subtracting the total value of the minimum pumping amount of the additionally stopped unit from the minimum pumping amount total value is set as the minimum pumping amount total value after time t.

  In addition, the value obtained by subtracting the total value of the maximum yield of the additional units that have been suspended from the total maximum yield is the new maximum yield after t. Next, at STEP 409, the time t is counted up to t + 1, and the process returns to STEP 302 in FIG. 3 and repeats STEP 302 and subsequent steps until t exceeds the predicted time T, and additional operation from t = 0 to t = T is determined. I do.

  As described above, according to the present invention, the simple upper limit and lower limit storage amounts are individually provided for the simple processing pump 7 and the direct discharge pump 8, and the target upper and lower limit storage amounts are simply set at the preset target storage amount arrival time. The required maximum pumping amount and the required minimum pumping amount of the treatment pump 7 and the direct discharge pump 8 are obtained, and the simple processing pump 7 is added when the required minimum pumping amount of the simple processing pump 7 is larger than the maximum pumping amount of the pump that is already in operation. The direct discharge pump 8 is operated when the required minimum pumping amount of the direct discharge pump 8 is greater than a value obtained by adding the maximum pumping amount of the simple processing pump 7 that is additionally operated to the maximum pumping amount of the pump that is already in operation. Do additional operation.

  Further, when the required maximum pumping amount of the direct discharge pump 8 is smaller than the minimum pumping amount of the pump that is already in operation, the direct discharge pump 8 is stopped, and then the required maximum pumping amount of the simple processing pump 7 is already in operation. The simple processing pump 7 is stopped when it is smaller than the value obtained by subtracting the minimum pumping amount of the direct discharge pump 8 newly stopped from the minimum pumping amount of the pump.

  By operating as described above, the pump can be operated without fear of inundation, and when the predicted inflow rate suddenly increases or decreases and additional operation or stop of the pump becomes necessary, Compared to the case where there is only one reference amount, in the present invention, since there is a zone in which the lower limit storage amount is subtracted from the upper limit storage amount, the stoppage is delayed from the additional operation by the storage amount corresponding to this zone. Therefore, it is possible to suppress the operation or stop of the pump within a short time, and a stable pump operation can be performed.

  Moreover, since the target upper and lower limit storage amounts are individually provided for the simple processing pump 7 and the direct release pump 8, the upper limit storage amount of the simple processing pump 7 is set lower than the upper limit storage amount of the direct release pump 8. The operation of the direct release pump 8 can be delayed from the operation of the simple processing pump 7 by the difference in the upper limit storage amount between the direct release pump 8 and the simple processing pump 7. For this reason, the simple treatment facility can be effectively used to reduce the pollution of the discharged water.

  Furthermore, since the target upper limit storage amount of the simple processing pump 7 is smaller than the target upper limit storage amount of the direct release pump 8, the simple processing pump 7 is operated earlier than the direct release pump 8 if the water level rises. The operation of the direct release pump 8 can be suppressed until it is predicted that the upper limit storage amount will be exceeded.

  In addition, when the water level is soared due to sudden torrential rain, etc., and the target upper limit storage amount of the direct release pump 8 is predicted to be exceeded in a short time, the direct release pump 8 is operated without waiting for the start of the simple processing. Can do. For this reason, it is possible to perform a stable pump operation without the risk of inundation while suppressing the discharge of water having a high pollution concentration.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing a rainwater pump control device installed in a sewage treatment plant according to Embodiment 2 of the present invention, and FIG. 6A is a graph showing the relationship between the inflow water level and the target upper limit storage amount arrival time. FIG. 6 (b) is a graph showing the relationship between the inflow water level and the target lower limit storage amount arrival time.

  In the first embodiment, the required pumping amount calculation unit 23 fixes the target upper limit storage amount arrival time TH1, TH2 and the target lower limit storage amount arrival time TL1, TL2 to the same value as the predicted time T, Although the case where the required minimum pumping amount is obtained has been described, in the present embodiment, the target upper limit / lower limit storage amount arrival time is changed by providing the target storage amount arrival time calculation unit 40 as shown in FIG. .

  That is, as shown in FIG. 6 (a), by setting the target upper limit storage amount arrival time to be longer than the predicted time T when the inflow water level becomes higher, the simplified processing pump 7 and the direct discharge pump according to the rise in the water level. 8 additional operation can be performed quickly.

  Further, as shown in FIG. 6 (b), by setting the target lower limit storage amount arrival time to be longer than the predicted time T when the inflow water level becomes low, the simplified processing pump 7 and the direct discharge pump are set according to the decrease in the water level. 8 stops can be performed quickly.

  For this reason, it is possible to suppress the concentration of pumps that are additionally operated after the water level reaches the upper limit storage amount, and to suppress the concentration of pumps that are stopped after the water level reaches the vicinity of the lower limit storage amount. Therefore, excessive additional operation and stoppage can be reduced, and an economical and stable operation of the rainwater pump can be performed.

Embodiment 3 FIG.
FIG. 7 is a block diagram showing a storm water pump control device installed in a sewage treatment plant according to Embodiment 3 of the present invention, and FIG. 8 is a flowchart for showing the operation. In the first embodiment, the case where the pump operation stop calculating unit 24 performs the additional operation when the necessary minimum pumping amount is larger than the maximum pumping amount of the pump that is already in operation has been described.

  In contrast, in the present embodiment, as shown in FIG. 7, an additional operation determination coefficient setting unit (rainfall mode determination unit) 50 is provided, and precipitation is predicted for a predetermined time (for example, one hour ahead) by weather forecast. By value, the rain mode of light rain mode, medium rain mode and heavy rain mode is judged, and the additional operation judgment coefficient is set to a value close to 0 in heavy rain mode, close to 1 in light rain mode, and close to 0.5 in light rain mode It is set to a value. Note that the pump stoppage determination in the pump operation stop calculation unit 24 is the same as in the first embodiment.

  In FIG. 8, in STEP 801, the total value of the maximum pumping amount and the minimum pumping amount of the pump currently in operation is obtained without distinguishing between the simple processing pump 7 and the direct discharge pump 8 at time t = 0. Next, in STEP 802, if the time t is within the predicted time T, the process proceeds to STEP 803. If the time t exceeds the predicted time T, the operation stop determination is terminated.

  In STEP803, the additional determination yield QJ at time t is obtained as the minimum yield total value Qpplan_min + additional operation determination coefficient α × (maximum yield total value Qpplan_max−minimum yield total value Qpplan_min). This additional determination pumping amount QJ corresponds to the maximum total pumping amount in STEP 303 of FIG.

  In STEP 804, it is determined whether or not the additional determination pumping amount is smaller than the minimum required pumping amount of the simple processing pump 7, and the pump operation is added when it is small. In STEP805, the shortage pumping amount 1 of the simple processing pump 7 is obtained by subtracting the additional determination pumping amount QJ from the necessary minimum pumping amount of the simple processing pump 7.

  Next, in STEP806, the simple processing pump 7 that can be additionally operated is selected, and the minimum pumping amount + additional operation determination coefficient α × (maximum pumping amount−minimum pumping amount) of the unit selected from the insufficient pumping amount 1 to the additional operation. ) Is subtracted from the value of 1 The simple treatment pump 7 is additionally operated until the insufficient pumping amount 1 ≦ 0 or until there is no additional operable unit.

  Next, in STEP 807, a value obtained by adding the total value of the minimum pumping amount of the additionally operated unit to the minimum pumping amount total value is again set as the minimum pumping amount total value after time t. In addition, the value obtained by adding the total value of the maximum pumping volume of the additionally operated unit to the maximum pumping volume total value will be the new maximum pumping volume total value after time t.

  Furthermore, the additional determination pumping amount QJ is updated as the minimum pumping amount total value Qpplan_min + additional operation determination coefficient α × (maximum pumping amount total value Qpplan_max−minimum pumping amount total value Qpplan_min). Next, in STEP 808, it is determined whether or not the additional determination pumping amount is smaller than the necessary minimum pumping amount of the direct discharge pump 8, and when it is small, the pump operation is added.

  In STEP809, the shortage pumping amount 2 of the direct discharge pump 8 is obtained by subtracting the additional determination pumping amount QJ from the necessary minimum pumping amount of the direct discharge pump 8. Next, in STEP 810, the direct discharge pump 8 that can be additionally operated is selected and the minimum pumping amount + additional operation determination coefficient α × (maximum pumping amount−minimum pumping amount) of the unit selected for the additional operation from the insufficient pumping amount 2 ) Is subtracted from 2 The direct discharge pump 8 is additionally operated until the insufficient pumping amount 2 ≦ 0 or until there is no additional operable unit.

  Next, in STEP811, the value obtained by adding the total value of the minimum pumping amount of the additionally operated unit to the minimum pumping amount total value is again set as the minimum pumping amount total value after time t. In addition, the value obtained by adding the total value of the maximum pumping volume of the additionally operated unit to the maximum pumping volume total value will be the new maximum pumping volume total value after time t. The subsequent operation is the same as the operation shown in FIG.

  By configuring as described above, it is possible to adjust the timing of the additional operation according to the rainfall situation, and it is possible to perform a pump operation that is safer against inundation.

It is a block block diagram which shows the rainwater pump control apparatus installed in the sewage treatment plant by Embodiment 1 of this invention. It is a figure which shows the relationship between the time t, each required pumping amount, and storage amount. It is a flowchart which shows the process which judges whether the driving | operation of a pump is performed. It is a flowchart which shows the process of determining whether a pump is stopped. It is a block block diagram which shows the rainwater pump control apparatus installed in the sewage treatment plant by Embodiment 2 of this invention. It is the graph (a) which shows the relationship between an inflow water level and target upper limit storage amount arrival time, and the graph (b) which shows the relationship between an inflow water level and target lower limit storage amount arrival time. It is a block block diagram which shows the rainwater pump control apparatus installed in the sewage treatment plant by Embodiment 3 of this invention. It is a flowchart for showing operation | movement of the rainwater pump control apparatus installed in the sewage treatment plant by Embodiment 3 of this invention.

Explanation of symbols

1 Sewage pipe dredging, 7 Simple processing pump, 8 Direct release pump, 9 Simple processing facility,
20 rainwater inflow prediction unit, 21 storage amount calculation unit, 22 target storage amount calculation unit,
23 required pumping amount calculation unit, 24 pump operation stop calculation unit, 30 rainwater pump control device,
40 target storage amount arrival time calculation unit, 50 additional operation determination coefficient setting unit.

Claims (3)

Either a simple treatment pump that drains rainwater flowing through a sewage pipe and flowing into a pump station or sewage treatment facility through a simple treatment facility, or a direct-release pump that drains water without going through the simple treatment facility. A rainwater pump control device for controlling a rainwater pump,
A rainwater inflow prediction unit that predicts rainwater inflow to a predetermined time ahead based on rainfall data;
A storage amount calculation unit that calculates the storage amount of the storage facility from the water level of the facility into which rainwater flows,
The target storage amount for calculating the target upper limit storage amount and the target lower limit storage amount of the storage facility for each of the simple processing pump and the direct release pump so that those related to the simple processing pump are smaller than those related to the direct release pump. An arithmetic unit;
For each of the simple processing pump and the direct-release pump, the minimum required pumping amount of the rainwater pump, in which the storage amount of the storage facility becomes the target upper limit storage amount after a predetermined target storage amount arrival time, and the target lower limit storage amount A required pumping amount calculation unit that obtains the required maximum pumping amount in consideration of the rainwater inflow amount, and
A pump operation stop calculation unit for controlling the operation and stop of the rainwater pump,
The pump operation stop calculation unit only calculates the maximum pumping amount total value that is the sum of the maximum pumping amount of the rainwater pump to be operated and the minimum pumping amount total value that is the sum of the minimum pumping amount of the rainwater pump that is already in operation. When it is calculated that the maximum pumping amount is smaller than the required minimum pumping amount for the simple processing pump, it is determined that additional operation of the simple processing pump is necessary, and Until the first short pumping amount, which is a value obtained by subtracting the maximum pumping amount from the necessary minimum pumping amount, becomes negative, start the simple processing pump that is not operating,
Including the rainwater pump that operates the simple treatment pump that starts operation, the maximum pumping amount total value is calculated, and the maximum pumping amount total value is smaller than the necessary minimum pumping amount for the direct discharge pump. , Until it is determined that additional operation of the direct discharge pump is necessary, and the second insufficient pumping amount, which is a value obtained by subtracting the total maximum pumping amount from the required minimum pumping amount for the direct discharging pump, is negative, Start the direct pump that is not in operation,
Calculate the minimum pumping amount total value included in the rainwater pump that operates the rainwater pump to start operation, and when the minimum pumping amount total value becomes larger than the required maximum pumping amount for the direct discharge pump, It is determined that an additional stop of the direct discharge pump is necessary, and the operation is continued until the first excess pumping amount, which is a value obtained by subtracting the required maximum pumping amount for the direct discharge pump from the total minimum pumping amount, becomes negative. Stop the direct release pump inside,
The minimum pumped amount total value is calculated excluding the rainwater pump that operates the direct discharge pump that is shut down, and the minimum pumped amount total value is larger than the required maximum pumped amount for the simple processing pump. , Until it is determined that an additional stop of the simple processing pump is necessary, and the second excess pumping amount, which is a value obtained by subtracting the required maximum pumping amount for the simple processing pump from the minimum pumping amount total value, becomes negative, A rainwater pump control device characterized by stopping the simple processing pump during operation. The rainwater pump control apparatus according to claim 1, further comprising a target storage amount arrival time calculation unit that calculates the target storage amount arrival time according to a water level of a facility into which the rainwater flows. A rain mode determination unit that determines a rain mode based on a precipitation prediction value of a predetermined time ahead according to a weather forecast, and the pump operation stop calculation unit calculates the current maximum pumping amount so as to change according to the rain mode. The rainwater pump control device according to claim 1 or 2, characterized in that

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