Digital Twin-Based Management Method and System for Separate Flow of Different Qualities of Drainage Outlets

Abstract

The present invention relates to a method and system for separate quality and flow management of drainage outlets based on digital twins. The method includes: simulating according to different flow diversion conditions of the flow diversion tank to construct a physical model of the flow diversion tank; collecting the actual working condition data set of the flow diversion tank; constructing a digital twin model, using the digital twin model to simulate the real-time operation state of the flow diversion tank, and calculating the instantaneous flow rate in the flow diversion tank in combination with the collected actual working condition data set of the flow diversion tank and the constructed physical model of the flow diversion tank; making a separate quality and flow diversion judgment for the drainage outlet by combining the calculated instantaneous flow rate in the flow diversion tank and the collected actual working condition data set of the flow diversion tank to obtain a decision result for separate quality and flow diversion of the drainage outlet; and discharging water according to the obtained decision result for separate quality and flow diversion of the drainage outlet. This method can achieve the real-time performance and accuracy of instantaneous flow rate calculation and is less affected by the environment; by combining the calculated instantaneous flow rate and the collected data to make a separate quality and flow diversion judgment for the drainage outlet, it can distinguish sewage and rainwater as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater and sewage diversion and drainage management, and particularly to a method and system for quality-based diversion management of drainage outlets based on digital twin. Background Art

[0002] Quality-based diversion management is a new urban drainage management technology for pipe and channel systems that discharge domestic sewage, industrial wastewater, first flush rainwater and other sewage and clean rainwater. It classifies and collects or discharges according to water quality characteristics to realize the resource utilization of rainwater, avoid pollution of receiving water bodies, and improve the operation efficiency of sewage treatment plants.

[0003] To solve the quality-based diversion management of rainwater and sewage, for example, a Chinese utility model patent with the patent number ZL202122307312.5 (the authorized announcement number is CN216405630U) discloses an intelligent quality-based diversion drainage outlet device, including: a diversion tank, which is provided with a water inlet pipe, a rainwater discharge pipe, a rainwater discharge valve, a rainwater runoff pipe, a rainwater runoff valve, a water quality sensor and / or a liquid level sensor; and an intelligent box, which includes a sunny and rainy day sensor and a controller, and the controller is electrically connected to the sunny and rainy day sensor, the rainwater discharge valve, the rainwater runoff valve, the water quality sensor and / or the liquid level sensor.

[0004] Although the above device has a simple and efficient initial rainwater runoff process, the initial rainwater after runoff is discharged into the municipal sewage pipe network, while the relatively clean rainwater is directly discharged, which can effectively reduce the treatment pressure of the municipal rainwater pipe network for collecting rainwater and ensure the safe and reliable reuse of rainwater. However, the above device has the following limitations in use: since the above device realizes quality-based diversion through the judgment of the water level and water quality in the diversion tank, specifically: when the controller judges that the water level is greater than the water level threshold, it controls the rainwater discharge valve to open and the rainwater runoff valve to close; when the controller judges that the water level is less than or equal to the water level threshold and the water quality is greater than the water quality threshold, it controls the rainwater runoff valve to open and the rainwater discharge valve to close. Since the parameters detected by the water quality sensor and the liquid level sensor are single, it is impossible to accurately distinguish sewage and rainwater, so the quality-based diversion accuracy of this device is limited. Therefore, it is necessary to further improve the existing technology. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a method for quality-based diversion management of drainage outlets based on digital twin that can distinguish sewage and rainwater as much as possible to improve the quality-based diversion accuracy in view of the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a system applying the above-mentioned method for quality-based diversion management of drainage outlets based on digital twin.

[0007] The technical solution adopted by the present invention to solve the above first technical problem is: a method for managing separate discharge of different qualities at drainage outlets based on digital twin, characterized by including:

[0008] Simulate according to different diversion conditions of the diversion tank to construct a physical model of the diversion tank;

[0009] Collect the actual working condition data set of the diversion tank;

[0010] Construct a digital twin model, use the digital twin model to simulate the real-time operation state of the diversion tank, and calculate the instantaneous flow rate in the diversion tank by combining the actually collected working condition data set of the diversion tank and the constructed physical model of the diversion tank;

[0011] Combine the calculated instantaneous flow rate in the diversion tank and the actually collected working condition data set of the diversion tank to judge the separate discharge of different qualities at the drainage outlet, and obtain the decision result of the separate discharge of different qualities at the drainage outlet;

[0012] Drain water according to the obtained decision result of the separate discharge of different qualities at the drainage outlet.

[0013] Preferably, the physical model of the diversion tank includes a relationship model between the liquid level of the diversion tank and the pipe cross-sectional area of the diversion tank, a flow velocity calculation model, and a dynamic water flow behavior model.

[0014] Further, in the present invention, the actual working condition data of the diversion tank includes conductivity, flow velocity, the liquid level of the diversion tank, and whether there is precipitation.

[0015] Still further, in the present invention, the specific process of the separate discharge of different qualities at the drainage outlet judgment is:

[0016] Substitute the calculated instantaneous flow rate in the diversion tank and the actually collected working condition data set of the diversion tank into the following calculation formula to obtain the rain probability ; where the rain probability The calculation formula of is:

[0017] ;

[0018] Among them, , And Are all weights, ∈(0, 1), ∈(0, 1), ∈(0, 1), and + + =1; R is 0 or 1, when there is no precipitation, R is 0; when there is precipitation, R is 1; And Are all conductivity weights, is the real-time conductivity, is the reference conductivity value of rainwater, is the reference conductivity value of sewage, is the instantaneous flow rate in the diversion tank, is the basic water volume threshold;

[0019] The sewage probability is calculated according to the following formula ; where the sewage probability The calculation formula is:

[0020] ;

[0021] Judge the rainwater probability whether it is greater than the preset value. If so, it is determined that the decision result of the quality-differentiated flow diversion at the current drainage outlet is mainly rainwater; if not, it is determined that the decision result of the quality-differentiated flow diversion at the current drainage outlet is mainly sewage.

[0022] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a quality-differentiated flow diversion management system for drainage outlets based on digital twin, which is used to implement the quality-differentiated flow diversion management method for drainage outlets based on digital twin as described above. It is characterized in that the quality-differentiated flow diversion management system for drainage outlets based on digital twin includes:

[0023] A model construction module for constructing a physical model of the diversion tank;

[0024] A data acquisition module for acquiring the actual working condition data set of the diversion tank;

[0025] A simulation operation module is connected to the model construction module and the data acquisition module. The simulation operation module receives the physical model of the diversion tank constructed by the model construction module and the actual working condition data set of the diversion tank acquired by the data acquisition module, constructs a digital twin model, simulates the real-time operation state of the diversion tank by using the digital twin model, and calculates the instantaneous flow rate in the diversion tank in combination with the actually acquired working condition data set of the diversion tank and the constructed physical model of the diversion tank;

[0026] A decision module is connected to the simulation operation module and the data acquisition module. The decision module receives the instantaneous flow rate in the diversion tank calculated by the simulation operation module and the actual working condition data set of the diversion tank acquired by the data acquisition module, and makes a quality-differentiated flow diversion judgment for the drainage outlet in combination with the calculated instantaneous flow rate in the diversion tank and the actually acquired working condition data set of the diversion tank, and obtains the decision result of the quality-differentiated flow diversion of the drainage outlet;

[0027] A control execution module is connected to the decision module. The control execution module receives the decision result of the decision module and uses the decision result of the decision module as a control input to control the drainage.

[0028] Preferably, the data acquisition module includes a conductivity sensor for collecting conductivity, a flow rate sensor for collecting flow rate, a liquid level sensor for collecting the liquid level of the diversion tank, and a rain and snow sensor for collecting whether there is precipitation.

[0029] Compared with the prior art, the advantages of the present invention are as follows: on the one hand, the drainage outlet quality-diverted flow management method of this invention patent application constructs a physical model of the diversion tank and collects the actual working condition data set of the diversion tank, and then constructs a digital twin model to simulate the real-time operation state of the diversion tank, and calculates the instantaneous flow rate in the diversion tank by combining the collected actual working condition data set of the diversion tank and the physical model of the diversion tank, realizing the combination of the physical model of the diversion tank and the simulation, achieving the dynamic calculation of the flow rate in the diversion tank based on multi-index data of the diversion tank, being able to realize the real-time performance and accuracy of the dynamic instantaneous flow rate calculation, and being less affected by the environment; on the other hand, by combining the calculated instantaneous flow rate in the diversion tank and the collected actual working condition data set of the diversion tank to judge the quality-diverted flow of the drainage outlet, so as to judge the source of the mixed drainage and distinguish sewage and rainwater as much as possible. Therefore, the quality-diverted flow management method has high quality-diverted flow accuracy, good real-time performance, and is less affected by the environment. Description of the Drawings

[0030] Figure 1 It is a flowchart of the drainage outlet quality-diverted flow management method based on digital twin in an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the drainage outlet quality-diverted flow management system based on digital twin in an embodiment of the present invention. Detailed Embodiments

[0032] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0033] As Figure 1 shown, the drainage outlet quality-diverted flow management method based on digital twin in this embodiment includes:

[0034] Simulate according to different diversion working conditions of the diversion tank and construct a physical model of the diversion tank; the physical model of the diversion tank includes a relationship model between the liquid level of the diversion tank and the pipe cross-sectional area of the diversion tank, a flow rate calculation model, and a dynamic water flow behavior model;

[0035] Collect the actual working condition data set of the diversion tank; in this embodiment, the actual working condition data of the diversion tank includes conductivity, flow rate, the liquid level of the diversion tank, and whether there is precipitation;

[0036] Construct a digital twin model, use the digital twin model to simulate the real-time operation state of the diversion tank, and calculate the instantaneous flow rate in the diversion tank by combining the collected actual working condition data set of the diversion tank and the constructed physical model of the diversion tank;

[0037] Based on the calculated instantaneous flow rate in the flow splitting tank and the collected set of actual operating condition data of the flow splitting tank, perform the judgment of separate quality flow splitting at the drainage outlet to obtain the decision result of separate quality flow splitting at the drainage outlet;

[0038] In this embodiment, the specific process of the judgment of separate quality flow splitting at the drainage outlet is as follows:

[0039] Substitute the calculated instantaneous flow rate in the flow splitting tank and the collected set of actual operating condition data of the flow splitting tank into the following calculation formula to obtain the rain probability ; where the rain probability The calculation formula is:

[0040] ;

[0041] Among them, , and Are all weights, ∈(0, 1), ∈(0, 1), ∈(0, 1), and + + = 1; R is 0 or 1. When there is no precipitation, R is 0; when there is precipitation, R is 1; and Are both conductivity weights, Is the real-time conductivity, Is the conductivity reference value of rainwater, Is the conductivity reference value of sewage, Is the instantaneous flow rate in the flow splitting tank, Is the basic water volume threshold;

[0042] In this embodiment, Is the normal instantaneous flow rate when there is no rainfall, and is determined by combining historical statistics , and The values of can be adjusted according to the application scenario. For example: in areas with frequent rainfall, increase ; when the conductivity of sewage fluctuates greatly, increase ; when the water volume changes significantly, increase ;

[0043] Calculate the sewage probability according to the following formula ; where the sewage probability The calculation formula is:

[0044] ;

[0045] Judge the rain probability Whether it is greater than a preset value. If so, it is determined that the decision result of the current drainage outlet for separate quality flow is mainly rainwater; if not, it is determined that the decision result of the current drainage outlet for separate quality flow is mainly sewage;

[0046] Drain water according to the obtained decision result of the drainage outlet for separate quality flow.

[0047] Due to different operating conditions of the diversion tank, the calculation formulas used to calculate the instantaneous flow rate in the diversion tank are also different. In this embodiment, the calculation formulas used to calculate the instantaneous flow rate in the flow tank all adopt existing technologies. For the convenience of understanding the method in the present invention, the following two specific cases are used for illustration in this embodiment:

[0048] Case 1: Calculate the instantaneous flow rate Q based on the measured flow velocity and liquid level height, and in combination with the geometric shape of the pipeline.

[0049] Assumptions:

[0050] Flow velocity : 1.5 m / s

[0051] Liquid level height : 0.5 m

[0052] Pipeline diameter : 1.0 m

[0053] Pipeline shape: Circular pipeline

[0054] Calculation of pipeline cross-sectional area:

[0055] When the liquid level is less than the pipeline diameter , the cross-sectional area can be calculated by the following formula:

[0056] Pipeline radius ;

[0057] Central angle (radian): ;

[0058] Partial circle area

[0059] Partially filled cross-sectional area

[0060] Instantaneous flow rate in the diversion tank

[0061] In the instantaneous flow rate calculation formula of this Case 1, it is calculated by combining the relationship model between the liquid level of the diversion tank and the pipeline cross-sectional area of the diversion tank and the collected flow velocity to obtain the instantaneous flow rate;

[0062] Case 2: Flow rate calculation based on Manning's formula

[0063] Applicable types: rainwater, sewage discharge channels or natural water channels, with complete and accurate pipe segment data;

[0064] If it is other cross-sections (such as circular or trapezoidal), the wetted cross-sectional area and wetted perimeter should be calculated separately and then substituted into the formula;

[0065] Detailed description of the formula application and calculation process:

[0066] Assumptions:

[0067] A rectangular channel for rainwater drainage, with the following parameters:

[0068] Bottom width of the channel : 2m

[0069] Water depth : 1 m

[0070] The bottom material of the channel is concrete, and the Manning coefficient : 0.015

[0071] Hydraulic gradient : 0.002

[0072] Calculation process:

[0073] Wetted cross-sectional area Calculation:

[0074] Wetted perimeter Calculation:

[0075] Hydraulic radius ;

[0076] Calculate the instantaneous flow rate according to the Manning formula

[0077] The instantaneous flow rate of this channel under the current conditions is ;

[0078] In the instantaneous flow rate calculation formula of this second case, the velocity calculation model (i.e., the above Manning formula) and the collected liquid level (i.e., the liquid level of the diversion tank) are combined for calculation to obtain the instantaneous flow rate;

[0079] Such as Figure 2 As shown, this embodiment also involves a digital-twin-based drainage outlet quality-differentiated diversion management system for implementing the above digital-twin-based drainage outlet quality-differentiated diversion management method. The digital-twin-based drainage outlet quality-differentiated diversion management system includes:

[0080] A model construction module for constructing a physical model of the diversion tank;

[0081] A data acquisition module for acquiring the actual working condition data set of the diversion tank;

[0082] A simulation operation module is connected to the model construction module and the data acquisition module. The simulation operation module receives the physical model of the diversion tank constructed by the model construction module and the actual working condition data set of the diversion tank acquired by the data acquisition module, constructs a digital twin model, uses the digital twin model to simulate the real-time operation state of the diversion tank, and calculates the instantaneous flow rate in the diversion tank by combining the actual working condition data set of the acquired diversion tank and the physical model of the constructed diversion tank;

[0083] A decision-making module is connected to the simulation operation module and the data acquisition module. The decision-making module receives the instantaneous flow rate in the diversion tank calculated by the simulation operation module and the actual working condition data set of the diversion tank acquired by the data acquisition module, and makes a judgment on the quality-based diversion of the drainage outlet by combining the calculated instantaneous flow rate in the diversion tank and the actual working condition data set of the acquired diversion tank to obtain the decision-making result of the quality-based diversion of the drainage outlet;

[0084] A control execution module is connected to the decision-making module. The control execution module receives the decision-making result of the decision-making module and uses the decision-making result of the decision-making module as a control input to control drainage.

[0085] The data acquisition module in this embodiment includes a conductivity sensor for acquiring conductivity, a flow velocity sensor for acquiring flow velocity, a liquid level sensor for acquiring the liquid level of the diversion tank, and a rain and snow sensor for acquiring whether there is precipitation.

[0086] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A drainage outlet quality and flow management method based on digital twins, characterized in that: include: Conduct simulation according to different diversion conditions of the diversion pool and build a physical model of the diversion pool; Collect the actual working condition data set of the diversion pool; Build a digital twin model, use the digital twin model to simulate the real-time operating status of the diversion pool, and calculate the instantaneous flow in the diversion pool by combining the actual working condition data set of the collected diversion pool and the physical model of the built diversion pool; Combine the calculated instantaneous flow in the diversion pool and the actual working condition data set collected from the diversion pool to make a judgment on the quality and diversion of the drainage outlet, and obtain the decision result of the quality and diversion of the drainage outlet; The specific process of judging the quality and flow of the drainage outlet is as follows: Substitute the calculated instantaneous flow in the diversion pool and the actual working condition data set collected from the diversion pool into the following calculation formula to obtain the rain probability ; Among them, the probability of rain The calculation formula is: ； in, , and are weights, ∈(0,1), ∈(0,1), ∈(0,1), and + + =1; R is 0 or 1. When there is no precipitation, R is 0; when there is precipitation, R is 1; and are conductivity weights, is the real-time conductivity, is the reference value of the electrical conductivity of rainwater, is the reference value of sewage conductivity, is the instantaneous flow rate in the diversion pool, is the basic water volume threshold; The sewage probability is calculated according to the following formula ; Among them, the probability of sewage The calculation formula is: ； Determine the probability of rain Is it greater than a preset value? If so, it is determined that the decision result of the current drainage outlet separation and diversion is mainly rainwater; if not, it is determined that the decision result of the current drainage outlet separation and diversion is mainly sewage; Drainage is carried out according to the decision results of the drainage outlet’s quality and flow separation.

2. The drainage outlet quality and flow management method according to claim 1 is characterized by: The physical model of the diversion pool includes a relationship model between the liquid level of the diversion pool and the pipe cross-sectional area of ​​the diversion pool, a flow rate calculation model and a dynamic water flow behavior model.

3. The drainage outlet quality and flow management method according to claim 2 is characterized by: The actual working condition data of the diversion pool include conductivity, flow rate, liquid level of the diversion pool and whether there is precipitation.

4. A drainage outlet quality and flow separation management system based on digital twins, used to implement the drainage outlet quality and flow separation management method based on digital twins as described in any one of claims 1 to 3 above, characterized in that: The digital twin-based drainage outlet quality and flow management system includes: A model building module, used to build a physical model of the diversion pool; A data acquisition module, used to collect actual working condition data of the diversion pool; A simulation operation module is connected to the model construction module and the data acquisition module, the simulation operation module receives the physical model of the diversion pool constructed by the model construction module and the actual working condition data set of the diversion pool collected by the data acquisition module, and constructs a digital twin model, uses the digital twin model to simulate the real-time operating status of the diversion pool, and calculates the instantaneous flow in the diversion pool in combination with the actual working condition data set of the diversion pool collected and the physical model of the diversion pool that has been constructed; A decision module is connected to the simulation operation module and the data acquisition module. The decision module receives the instantaneous flow in the diversion pool calculated by the simulation operation module and the actual working condition data set of the diversion pool collected by the data acquisition module, and makes a judgment on the quality and diversion of the drainage outlet in combination with the instantaneous flow in the diversion pool calculated and the actual working condition data set of the diversion pool collected, so as to obtain a decision result on the quality and diversion of the drainage outlet; The control execution module is connected to the decision module. The control execution module receives the decision result of the decision module and uses the decision result of the decision module as a control input to control drainage.

5. The drainage outlet quality and flow separation management system according to claim 4 is characterized by: The data acquisition module includes a conductivity sensor for collecting conductivity, a flow rate sensor for collecting flow rate, a liquid level sensor for collecting the liquid level of the diversion pool, and a rain and snow sensor for collecting whether there is precipitation.

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