JP2012087721A - Pumping well cross section estimating method and pumping well cross section estimating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate the cross section of a pumping well including a sand basin with high accuracy.SOLUTION: A control device 10 detects a change in the operation number of suction pumps pumping sanitary sewage 4 from the pumping well 3, detects a pumping variation ΔQand a level variation ΔL of the sanitary sewage 4 when detecting the change in the operation number of the suction pumps, and calculates the cross section of the pumping well 3 including the sand basin 2, using the detected pumping variation ΔQand level variation ΔL of the sanitary sewage 4. Thus, the cross section of the pumping well 3 including the sand basin 2 can be estimated with high accuracy.

Description

  The present invention relates to a pump well cross-sectional area estimation method and a pump well cross-sectional area estimation device for estimating a cross-sectional area of a pump well necessary for simulating the behavior of water treatment plant equipment.

  Generally, when making a decision on an operation plan of a water treatment plant facility (hereinafter abbreviated as plant facility), a simulation of the behavior of the plant facility using computer technology is performed. In performing this simulation, if the simulation model does not correctly represent the actual plant equipment, the behavior of the plant equipment obtained by the simulation does not match the behavior of the actual plant equipment, and the simulation accuracy is reduced. For this reason, the simulation model must correctly represent actual plant equipment. From this background, when simulating the behavior of a plant facility equipped with a pump that pumps sewage flowing into the pump well, the cross-sectional area of the pump well in the depth direction of the sewage and the pump characteristics should be used in the simulation model. I have to.

JP-A-6-47206

  By the way, when using the cross-sectional area of the pump well in the simulation of the plant equipment, it is necessary to calculate the cross-sectional area of the pump well in consideration of the structure of the sand basin. However, since the structure of the sedimentation basin is generally very complicated, the conventional simulation calculated the cross-sectional area of the pump well by ignoring the structure of the sedimentation basin based on the civil engineering drawings of the plant equipment. . For this reason, according to the simulation of the conventional plant equipment, the pump well cross-sectional area calculated by manual calculation does not match the actual pump well cross-sectional area, and therefore the plant equipment behavior cannot be accurately simulated. was there. From such a background, it is expected to provide a technology capable of estimating the cross-sectional area of the pump well including the sand basin structure with high accuracy.

  The present invention has been made in view of the above problems, and its purpose is to provide a pump well cross-sectional area estimation method and a pump well cross-sectional area estimation device capable of estimating the cross-sectional area of a pump well including a sand basin with high accuracy. It is to provide.

  In order to solve the above problems and achieve the object, a method for estimating a pump well cross-sectional area according to the present invention includes a step of detecting a change in the number of operating pumps for pumping sewage from a pump well including a sand basin, and the pump When a change in the number of operating water is detected, the step of detecting the amount of change in pumping and the change in water level of the sewage and the pump well including the sedimentation basin using the amount of change in pumping and the change in water level of the detected sewage are detected. Calculating a cross-sectional area.

  In order to solve the above problems and achieve the object, a pump well cross-sectional area estimation device according to the present invention includes first detection means for detecting a change in the number of operating pumps for pumping sewage from a pump well including a sand basin. When the change in the number of operating pumps is detected by the first detection means, the second detection means for detecting the pumping change amount and the water level change amount of the sewage, and the sewage detected by the second detection means Calculating means for calculating the cross-sectional area of the pump well including the sand basin using the amount of change in pumping and the amount of change in water level.

  According to the pump well cross-sectional area estimation method and the pump well cross-sectional area estimation device according to the present invention, the cross-sectional area of the pump well including the sand basin can be estimated with high accuracy.

FIG. 1 is a schematic diagram illustrating a configuration of a water treatment plant facility to which a pump well cross-sectional area estimation apparatus according to an embodiment of the present invention is applied. FIG. 2 is a flowchart showing a flow of pump well cross-sectional area estimation processing according to an embodiment of the present invention. FIG. 3 is a diagram illustrating an example of temporal changes in the amount of sewage flowing into the pump well, the amount of sewage pumped by the water absorption pump, and the level of sewage in the pump well.

  Hereinafter, with reference to the drawings, the configuration and operation of a pump well cross-sectional area estimation apparatus according to an embodiment of the present invention will be described.

[Configuration of water treatment plant equipment]
First, with reference to FIG. 1, the structure of the water treatment plant equipment with which the pump well area estimation apparatus which is one Embodiment of this invention is applied is demonstrated.

FIG. 1 is a schematic diagram illustrating a configuration of a water treatment plant facility to which a pump well cross-sectional area estimation apparatus according to an embodiment of the present invention is applied. As shown in FIG. 1, a water treatment plant facility 1 to which a pump well cross-sectional area estimation device according to an embodiment of the present invention is applied is configured to discharge sewage 4 flowing from a sand basin 2 into a pump well 3 into a discharge well 5. The water level of the sewage 4 in the pump well 3 is controlled within a predetermined range by controlling the operation / stop of the _N suction pumps P _{1 to} P _N that pump the water. The sewage 4 pumped to the discharge tank 5 is supplied to a water treatment facility 6 including an initial settling tank, an aeration tank, a final settling tank, etc., and is processed.

The water treatment plant facility 1 includes open / close valves V _{1 to} V _N and electric sensors 8 ₁ to 8 _N provided for each of the water absorption pumps P _{1 to} P _N , a water level sensor 9, a pumping amount sensor QS, and a control device 10. And comprising. The on-off valves V _{1 to} V _N are provided in pipes 7 _{1 to} 7 _N through which the sewage 4 discharged from the water absorption pumps P _{1 to} P _N flows, respectively, and are controlled to be opened and closed by the control device 10, whereby the water absorption pumps P ₁ to P _N. The flow rate of the sewage 4 pumped from the _PN to the discharge rod 5 is controlled. The electric sensors 8 ₁ to 8 _N detect the operation state of the electromagnetic contactors of the water absorption pumps P _{1 to} P _N , respectively, and input an electric signal indicating the detected operation state to the control device 10. That is, the electrical sensors 8 ₁ to 8 _N detect the number of operating water pumps P _{1 to PN} . The electric sensors 8 ₁ to 8 _N function as first detection means according to the present invention. The water level sensor 9 detects the water level L of the sewage 4 in the pump well 3 and inputs an electrical signal indicating the detected water level L to the control device 10. Pumping amount sensor QS detects the flow rate of the wastewater 4 being pumped to the discharge culvert 5 as pumping amount Q ₀ due to water absorption pump P ₁ to P _N, which is in operation, an electrical signal indicative of the pumping amount Q ₀ which has been detected Input to the control device 10. The pumped amount sensor QS and the water level sensor 9 function as the second detecting means according to the present invention.

The control device 10 is configured by an arithmetic processing device such as a workstation or a personal computer. The control device 10 controls the water level of the sewage 4 in the pump well 3 within a predetermined range by controlling the operation and the rotational speed of the water absorption pumps P _{1 to} P _N based on the electric signals input from the sensors. . Moreover, the control apparatus 10 operate | moves as a pump well cross-sectional area estimation apparatus which is one Embodiment of this invention, The cross-sectional area S (L) of the pump well 3 containing the sand basin 2 for every water level L of the sewage 4 is obtained. calculate. The control device 10 functions as calculation means according to the present invention.

[Pump well cross-sectional area calculation processing]
In the water treatment plant equipment 1 having such a configuration, the control device 10 executes the pump well cross-sectional area calculation process shown below, so that the cross-sectional area of the pump well 3 including the sand basin 2 for each water level L of the sewage 4 is obtained. S (L) is calculated. Hereinafter, with reference to the flowchart shown in FIG. 2, operation | movement of the control apparatus 10 at the time of performing a pump well area calculation process is demonstrated.

  FIG. 2 is a flowchart showing the flow of a pump well cross-sectional area calculation process according to an embodiment of the present invention. The flowchart shown in FIG. 2 starts at the timing when the water treatment plant facility 1 is operated, and the pump well cross-sectional area calculation process proceeds to the process of step S1. In the present embodiment, the pump well cross-sectional area calculation process is repeatedly executed at every predetermined control period while the water treatment plant facility 1 is operating.

In the process of step S1, the control device 10 determines whether or not the number of operating water pumps P _{1 to} P _N has changed based on the electric signals input from the electric sensors 8 ₁ to 8 _N. Then, the control unit 10 advances the pump well cross product calculation process at a timing when the number of operating units of the water pump P ₁ to P _N is changed to the process of step S2.

In the process of step S2, the control apparatus 10 detects the pumping change amount ΔQ ₀ per unit time based on the electric signal input from the pumping amount sensor QS. Thereby, the process of step S2 is completed, and the pump well cross-sectional area calculation process proceeds to the process of step S3.

  In the process of step S <b> 3, the control device 10 detects the water level change amount ΔL of the sewage 4 per unit time based on the electrical signal input from the water level sensor 9. Thereby, the process of step S3 is completed, and the pump well cross-sectional area calculation process proceeds to the process of step S4.

In the process of step S4, the control unit 10, using the detected pumping variation Delta] Q ₀ and level variation ΔL by the process of steps S2 and S3, the grit chamber 2 in the water level L detected by the water level sensor 9 The cross-sectional area S (L) of the pump well 3 is calculated. Here, the inflow change amount ΔQ _i per unit time of the sewage 4 to the pump well 3, the pumping change amount ΔQ ₀ of the sewage 4 per unit time, the cross-sectional area S (L) of the pump well 3 at the water level L, and the unit Between the water level change amount ΔL of the sewage 4 per hour, there is a relationship as shown in the following formula (1).

Therefore, when the inflow amount Q _i of the sewage 4 into the pump well 3 is constant in a minute time as shown in FIG. 3, that is, when the inflow amount change amount ΔQ _i per unit time can be approximated to 0, the water absorption When the pumping amount and the water level change by changing the number of pumps operated (between times T = T1 and T2 shown in FIG. 3), the pumping amount change ΔQ ₀ of the sewage 4 per unit time and the water level L Between the cross-sectional area S (L) of the well 3 and the amount of change ΔL of the sewage 4 per unit time, there is a relationship as shown in the following formula (2). From this, when the amount of change ΔQ _i per unit time can be approximated to 0, when the pumping amount and the water level change due to the change in the number of operating pumps, the cross-sectional area of the pump well 3 at the water level L S (L) can be calculated by substituting the pumping change amount ΔQ ₀ of the sewage 4 and the water level change amount ΔL of the sewage 4 per unit time into the following formula (3).

Therefore, the control device 10 includes the settling basin 2 at the water level L by substituting the pumping change amount ΔQ ₀ and the water level change amount ΔL detected by the processing of step S2 and step S3 into the following formula (3). The cross-sectional area S (L) of the pump well 3 is calculated. Thereby, the process of step S4 is completed and a series of pump well cross-sectional area calculation processes are complete | finished.

As is apparent from the above description, according to the pump well cross-sectional area calculation process that is one embodiment of the present invention, the control device 10 detects a change in the number of operating water pumps that pump sewage 4 from the pump well 3. When the change in the number of operating water pumps is detected, the pumping change amount ΔQ ₀ and the water level change amount ΔL of the sewage 4 are detected, and the detected pumping change amount ΔQ ₀ and the water level change amount ΔL of the sewage 4 are detected. Since the cross-sectional area of the pump well 3 including the sand basin 2 is calculated using this, the cross-sectional area of the pump well 3 including the sand basin 2 can be estimated with high accuracy.

  Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

1 water treatment plant equipment 2 sand basin 3 the pump well 4 sewage 5 discharge sewer 6 water treatment facility 7 ₁ to _7-N pipe 8 ₁ to 8 _N electrical sensors 9 water level sensor 10 control device P ₁ to P _N intake pump QS pumping quantity sensor V ₁ ~V _N opening and closing valves

Claims (2)

Detecting a change in the number of pumps operating to pump sewage from a pump well including a sand basin;
When a change in the number of operating pumps is detected, detecting a pumping change amount and a water level change amount of the sewage;
Calculating the cross-sectional area of the pump well including the sand basin using the detected change in pumping and change in water level of the sewage,
A pump well cross-sectional area estimation method comprising: First detection means for detecting a change in the number of operating pumps for pumping sewage from a pump well including a sand basin;
A second detecting means for detecting a pumping change amount and a water level change amount of the sewage when a change in the number of operating pumps is detected by the first detecting means;
Calculating means for calculating the cross-sectional area of the pump well including the sedimentation basin using the pumping change amount and the water level change amount of the sewage detected by the second detection means;
A pump well cross-sectional area estimation device comprising:

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