Industrial wastewater treatment and discharge monitoring and early warning method and system

Abstract

The invention relates to the technical field of wastewater treatment, in particular to an industrial wastewater treatment discharge monitoring and early warning method and system.The industrial wastewater treatment discharge monitoring and early warning method comprises the steps that a first forward flow value and a second forward flow value are obtained through a sensor, and a flow difference value is calculated; triggering primary early warning and starting a pipeline pressure sensor group to perform pressure detection to obtain pipeline key point pressure data, obtaining a pressure deviation degree through a pipeline pressure model according to the pipeline key point pressure data, and when the pressure deviation degree is greater than a preset second reflux judgment threshold value, triggering secondary early warning and feeding back a reflux area pipeline code, and obtaining a backflow momentum coefficient according to the pressure deviation degree and the flow difference value, and adjusting the opening degree of the valve according to the backflow momentum coefficient and the backflow area pipeline code, thereby realizing early warning and control of the wastewater backflow problem in the wastewater discharge process.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly to a method and system for monitoring, warning, and pre - warning the discharge of industrial wastewater. Background Art

[0002] During the process of industrial wastewater discharge, factors such as abnormal wastewater flow rate, valve failure, and pipeline blockage often cause wastewater back - flow. Wastewater back - flow not only may cause the back - flow of treated wastewater, resulting in secondary pollution, but also may seriously affect the normal operation of wastewater treatment facilities, thereby increasing maintenance costs and reducing wastewater treatment efficiency. At present, the monitoring and treatment of wastewater back - flow mainly rely on traditional manual experience and simple valve adjustment means. Due to the lack of an efficient monitoring and intelligent warning mechanism, these methods cannot timely and accurately capture the occurrence of back - flow in the pipeline, resulting in the inability to timely warn and accurately control wastewater back - flow. Therefore, how to more efficiently and accurately monitor and warn wastewater back - flow has become an urgent problem to be solved. Summary of the Invention

[0003] The present invention provides a method and system for monitoring, warning, and pre - warning the discharge of industrial wastewater to solve the problem that wastewater back - flow cannot be timely warned and controlled during the wastewater discharge process.

[0004] To achieve the above object, on the one hand, the present invention provides a method for monitoring, warning, and pre - warning the discharge of industrial wastewater, and the method includes:

[0005] Obtain a first forward flow value according to a flow sensor at the front end of the wastewater discharge pipeline, obtain a second forward flow value according to a flow sensor at the rear end of the wastewater discharge pipeline, and calculate a flow difference according to the first forward flow value and the second forward flow value.

[0006] When the flow difference is greater than a preset first back - flow determination threshold, trigger a first - level warning and start a pipeline pressure sensor group to perform pressure detection to obtain pipeline key - point pressure data, and obtain a pressure deviation degree through a pipeline pressure model according to the pipeline key - point pressure data.

[0007] When the pressure deviation degree is greater than a preset second back - flow determination threshold, trigger a second - level warning and feedback the pipeline code of the back - flow area, obtain a back - flow momentum coefficient according to the pressure deviation degree and the flow difference, and adjust the valve opening according to the back - flow momentum coefficient and the pipeline code of the back - flow area.

[0008] Further, the method of starting the pipeline pressure sensor group to perform pressure detection to obtain pipeline key - point pressure data and obtaining a pressure deviation degree through a pipeline pressure model according to the pipeline key - point pressure data includes:

[0009] Start the pipeline pressure sensors set at preset key - point positions on the wastewater discharge pipeline to perform pressure detection to obtain pipeline key - point pressure data.

[0010] Obtain the waste water density, waste water flow rate, and pipeline basic parameters including the pipeline length and pipeline inner diameter between the positions of each key point, and obtain the pressure deviation degree σ through the pipeline pressure model according to the pipeline key point pressure data i It is:

[0011]

[0012] Where P i is the pressure data of the i-th pipeline key point, P0 is the pressure data at the pipeline inlet, λ is the friction coefficient, D is the pipeline inner diameter, L j is the length of the j-th pipeline section, ρ is the waste water density, v j is the waste water flow rate of the j-th pipeline section, σ i is the pressure deviation degree of the i-th pipeline section.

[0013] Furthermore, the method of triggering a secondary warning and feeding back the pipeline code of the reflux area when the pressure deviation degree is greater than the preset second reflux determination threshold, obtaining the reverse flow momentum coefficient according to the pressure deviation degree and the flow difference, and adjusting the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reflux area includes:

[0014] When the pressure deviation degree is greater than the preset second reflux determination threshold, trigger a secondary warning and obtain the pipeline code of the reflux area through the axial pressure gradient positioning method.

[0015] Obtain the reverse flow momentum coefficient according to the pressure deviation degree and the flow difference It is:

[0016]

[0017] Where σ i is the pressure deviation degree of the i-th pipeline section, ΔQ is the flow difference, Q f is the first positive flow value, is the reverse flow momentum coefficient of the i-th pipeline section.

[0018] Adjust the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reflux area.

[0019] Furthermore, the method of obtaining the pipeline code of the reflux area through the axial pressure gradient positioning method includes:

[0020] Obtain the pipeline key point pressure data and calculate the pipeline section pressure gradient T i It is:

[0021]

[0022] Where P i is the pressure value detected by the i-th pressure sensor, Pi―1 is the pressure value detected by the (i - 1)-th pressure sensor, L i is the pipeline segment length of the i-th pipeline segment, T i is the pipeline segment pressure gradient of the i-th pipeline segment.

[0023] According to the pipeline segment pressure gradients, pressure mutation points are obtained through the mutation point determination rule, and the encoding of the pipeline corresponding to the pressure mutation point is used as the encoding of the reverse flow area pipeline.

[0024] Further, the method of obtaining the pressure mutation points according to the pipeline segment pressure gradients through the mutation point determination rule and using the encoding of the pipeline corresponding to the pressure mutation point as the encoding of the reverse flow area pipeline includes:

[0025] Calculate the pressure gradient change intensity δ between adjacent pipeline segments according to the pipeline segment pressure gradients as:

[0026] δ i = |T i+1 - T i |.

[0027] Where T i+1 is the pipeline segment pressure gradient of the (i + 1)-th pipeline segment, and δ i is the pressure gradient change intensity from the i-th pipeline segment to the (i + 1)-th pipeline segment.

[0028] Judge according to the pressure gradient change intensity of each pipeline segment as follows:

[0029] When and , it is determined that there is a pressure mutation point in the i-th pipeline segment.

[0030] When and , it is determined that there is a pressure mutation point in the (i + 1)-th pipeline segment.

[0031] Where δ i―1 is the pressure gradient change intensity from the (i - 1)-th pipeline segment to the i-th pipeline segment, k is the sensitivity coefficient, N is the total number of pipeline segments, and δ max is the maximum value of the pressure gradient change intensity of all pipeline segments.

[0032] Mark the encoding of the pipeline segment with a pressure mutation point as the encoding of the reverse flow area pipeline.

[0033] Further, the method of adjusting the valve opening according to the reverse flow momentum coefficient and the encoding of the reverse flow area pipeline includes:

[0034] Query the preset pipeline connection relationship database according to the encoding of the reverse flow area pipeline to obtain the regulating valve associated with the reverse flow area pipeline segment as the target valve.

[0035] Divide the pipeline segments in the reflux area whose corresponding target valves are the same target valve into the same valve group, and obtain the corrected opening of the target valve of the valve group according to the reverse momentum coefficients of the pipeline segments in the same valve group. It is:

[0036]

[0037] Where is the initial opening of the target valve of the j-th valve group, in m j is the total number of pipeline segments marked with the reflux area pipeline code in the j-th valve group, is the corrected opening of the target valve of the j-th valve group.

[0038] Adjust the valve opening according to the corrected opening of the target valve.

[0039] Furthermore, before adjusting the valve opening according to the corrected opening of the target valve, the method further includes:

[0040] Set the minimum safe opening of the valve, compare the corrected opening of the target valve with the minimum safe opening of the valve, and when the corrected opening of the target valve is less than the minimum safe opening, adjust the valve opening according to the minimum safe opening.

[0041] Trigger a level-three warning when adjusting the valve opening according to the minimum safe opening.

[0042] Based on the same inventive concept, the present invention provides an industrial wastewater treatment and discharge monitoring and warning system, which includes: a flow monitoring module, a pressure deviation analysis module, and a reflux control module, and the modules are connected in sequence.

[0043] The flow monitoring module is used to obtain a first forward flow value according to the flow sensor at the front end of the wastewater discharge pipeline, obtain a second forward flow value according to the flow sensor at the rear end of the wastewater discharge pipeline, and calculate the flow difference according to the first forward flow value and the second forward flow value.

[0044] The pressure deviation analysis module is used to trigger a level-one warning and start the pipeline pressure sensor group for pressure detection to obtain pipeline key point pressure data when the flow difference is greater than a preset first reflux determination threshold, and obtain the pressure deviation degree through a pipeline pressure model according to the pipeline key point pressure data.

[0045] The reflux control module is used to trigger a level-two warning and feedback the reflux area pipeline code when the pressure deviation degree is greater than a preset second reflux determination threshold, obtain the reverse momentum coefficient according to the pressure deviation degree and the flow difference, and adjust the valve opening according to the reverse momentum coefficient and the reflux area pipeline code.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows: early warning of backflow is achieved through real-time difference monitoring, accurate positioning of the mutation point is realized through the axial pressure gradient positioning method, the backflow momentum coefficient is constructed through pressure deviation analysis, and further combined with the non-linear compression characteristics of the hyperbolic tangent function to realize the adaptive smooth adjustment of the valve opening, so as to achieve the accurate early warning and control of the backflow problem in wastewater discharge as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0048] Figure 1 It is a flowchart of an industrial wastewater treatment and discharge monitoring and early warning method according to Embodiment 1 of the present invention;

[0049] Figure 2 It is a schematic diagram of the module composition of an industrial wastewater treatment and discharge monitoring and early warning system according to Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0051] Embodiment 1: As Figure 1 shown, this embodiment provides an industrial wastewater treatment and discharge monitoring and early warning method, and the method includes:

[0052] S1. Obtain the first forward flow value according to the flow sensor at the front end of the wastewater discharge pipeline, obtain the second forward flow value according to the flow sensor at the rear end of the wastewater discharge pipeline, and calculate the flow difference according to the first forward flow value and the second forward flow value.

[0053] It should be noted that the formula for calculating the flow difference according to the first forward flow value and the second forward flow value is:

[0054] ΔQ = Q f ―Q b .

[0055] Where Q f is the first forward flow value, Q bis the second forward flow value, and ΔQ is the flow difference.

[0056] For example: In the process of wastewater discharge, if the first forward flow value obtained by the flow sensor at the front end of the pipeline is 150 cubic meters per hour, and the second forward flow value obtained by the flow sensor at the back end is 135 cubic meters per hour. According to the method of calculating the flow difference, the flow difference is: ΔQ = Q f ―Q b = 150 ― 135 = 15 cubic meters per hour.

[0057] By calculating the flow difference, abnormal fluctuations in flow can be quickly captured, the flow anomaly in the wastewater pipeline can be reflected in a timely manner, and support can be provided for subsequent further refined analysis and processing.

[0058] S2. When the flow difference is greater than the preset first reverse flow determination threshold, trigger a first-level warning and start the pipeline pressure sensor group to perform pressure detection to obtain pipeline key point pressure data, and obtain the pressure deviation degree through the pipeline pressure model according to the pipeline key point pressure data.

[0059] By calculating the front and rear end flow differences, it is possible to initially judge whether there is a reverse flow phenomenon. If the flow difference is large, a first-level warning can be triggered. For example: When the flow difference is 15 cubic meters per hour and the preset first reverse flow determination threshold is 10 cubic meters per hour, since the flow difference is greater than the first reverse flow determination threshold, a first-level warning is triggered and the pipeline pressure sensor group is started to perform pressure detection. However, relying solely on the flow difference may result in misjudgment. The front and rear end flow differences cannot directly and accurately reflect the reverse flow in the pipeline. When reverse flow occurs in the pipeline, the flow direction and pressure distribution of the wastewater will change, and the pressure deviation degree provides a supplement and correction to the flow difference.

[0060] S3. When the pressure deviation degree is greater than the preset second reverse flow determination threshold, trigger a second-level warning and feedback the pipeline code of the reverse flow area. Obtain the reverse flow momentum coefficient according to the pressure deviation degree and the flow difference, and adjust the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area. Through the pressure deviation degree, abnormal changes inside the pipeline can be more accurately identified. For example, in some cases, the front and rear end flow fluctuations may be small, but the internal pressure of the pipeline changes violently. Relying solely on the flow difference is likely to result in missed judgment. Therefore, it is necessary to further analyze the reverse flow by combining the flow difference and the pressure deviation degree, so as to implement the control strategy more accurately.

[0061] It should be noted that the method of starting the pipeline pressure sensor group to perform pressure detection to obtain pipeline key point pressure data and obtaining the pressure deviation degree through the pipeline pressure model according to the pipeline key point pressure data includes:

[0062] Start the pipeline pressure sensor set at the preset key point position on the wastewater discharge pipeline to perform pressure detection and obtain the pipeline key point pressure data; the preset key point positions are, for example, the inlet, outlet, branch, etc. positions of the pipeline.

[0063] Obtain the wastewater density, wastewater flow rate, and pipeline basic parameters including the pipeline length and pipeline inner diameter between each key point position, and obtain the pressure deviation degree σ through the pipeline pressure model according to the pipeline key point pressure data i It is:

[0064]

[0065] Where P i is the pressure data of the i-th pipeline key point, P0 is the pressure data at the pipeline inlet, λ is the friction coefficient, D is the pipeline inner diameter, L j is the pipeline segment length of the j-th segment, ρ is the wastewater density, v j is the wastewater flow rate of the j-th pipeline segment, and σ i is the pressure deviation degree of the i-th pipeline segment.

[0066] The wastewater density can be obtained using a densitometer or through regular sampling experiments. The wastewater flow rate can be obtained through a flowmeter. The friction coefficient can be obtained by querying the corresponding parameter table of pipeline material and friction coefficient. For example, for a PVC pipe, λ takes a value of 0.02, and for a steel pipe, λ takes a value of 0.03.

[0067] For example: The pressure at the pipeline inlet is obtained as 400 kPa, the pressure at the first pipeline key point is 370 kPa, the pressure at the second pipeline key point is 386 kPa, the pressure at the third pipeline key point is 327 kPa. The pipeline segment length formed between the inlet and the first key point is 80 m, the pipeline segment length formed between the first and the second key points is 120 m, the pipeline segment length formed between the second and the third key points is 100 m. The wastewater density is obtained as 1000 kg / m 3 , the pipeline inner diameter is 0.15 m, the friction coefficient is 0.03, the wastewater flow rate of the first pipeline segment is 1.2 m / s, the wastewater flow rate of the second pipeline segment is 1.8 m / s, the wastewater flow rate of the third pipeline segment is 0.9 m / s. Then the pressure deviation degree of the first pipeline segment The pressure deviation degree of the second pipeline segment Similarly, the pressure deviation degree of the third pipeline segment σ3 = 4.43% can be obtained.

[0068] It should be noted that when the pressure deviation degree is greater than the preset second backflow determination threshold, a secondary warning is triggered and the pipeline code of the backflow area is fed back. The method of obtaining the backflow momentum coefficient according to the pressure deviation degree and the flow difference value and adjusting the valve opening according to the backflow momentum coefficient and the pipeline code of the backflow area includes:

[0069] When the pressure deviation degree is greater than the preset second reverse flow determination threshold, a secondary warning is triggered, and the pipeline code of the reverse flow area is obtained by the axial pressure gradient positioning method.

[0070] The reverse flow momentum coefficient is obtained according to the pressure deviation degree and the flow difference It is:

[0071]

[0072] Where σ i is the pressure deviation degree of the i-th pipeline section, ΔQ is the flow difference, and Q f is the first positive flow value, is the reverse flow momentum coefficient of the i-th pipeline section.

[0073] For example: when the pressure deviation degrees of each pipeline section are σ1 = 4.99%, σ2 = 9.43%, and σ3 = 4.43%, the corresponding reverse flow momentum coefficients can be calculated

[0074] Adjust the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area.

[0075] It should be noted that the method for obtaining the pipeline code of the reverse flow area by the axial pressure gradient positioning method includes:

[0076] Obtain the pressure data of the pipeline key points and calculate the pipeline section pressure gradient T i It is:

[0077]

[0078] Where P i is the pressure value detected by the i-th pressure sensor, and P i―1 is the pressure value detected by the (i - 1)-th pressure sensor, and L i is the pipeline section length of the i-th pipeline section, and T i is the pipeline section pressure gradient of the i-th pipeline section.

[0079] The i-th pipeline section refers to the pipeline section formed between the i-th pressure sensor and the (i + 1)-th pressure sensor.

[0080] For example: when the pressure at the pipe inlet is 400 kPa, the pressure at the first key point of the pipe is 370 kPa, the pressure at the second key point of the pipe is 386 kPa, the pressure at the third key point of the pipe is 327 kPa, the length of the pipe segment formed between the inlet and the first key point is 80 m, the length of the pipe segment formed between the first and the second key points is 120 m, and the length of the pipe segment formed between the second and the third key points is 100 m, the pressure gradient of the first pipe segment The pressure gradient of the second pipe segment The pressure gradient of the third pipe segment

[0081] According to the pressure gradient of each pipe segment, the pressure mutation points are obtained through the mutation point determination rule, and the code of the pipe corresponding to the pressure mutation point is used as the pipe code of the reverse flow area.

[0082] It should be noted that the method of obtaining the pressure mutation points according to the pressure gradient of each pipe segment through the mutation point determination rule and using the code of the pipe corresponding to the pressure mutation point as the pipe code of the reverse flow area includes:

[0083] Calculate the pressure gradient change intensity δ between adjacent pipe segments according to the pressure gradient of each pipe segment as:

[0084] δ i =|T i+1 ―T i |.

[0085] Where T i+1 is the pressure gradient of the (i + 1)-th pipe segment, and δ i is the pressure gradient change intensity from the i-th pipe segment to the (i + 1)-th pipe segment.

[0086] Judge according to the pressure gradient change intensity of each pipe segment as follows:

[0087] When and at the same time, it is determined that there is a pressure mutation point in the i-th pipe segment.

[0088] When and at the same time, it is determined that there is a pressure mutation point in the (i + 1)-th pipe segment.

[0089] Where δ i―1 is the pressure gradient change intensity from the (i - 1)-th pipe segment to the i-th pipe segment, k is the sensitivity coefficient, N is the total number of pipe segments, and δ max is the maximum value of the pressure gradient change intensity of all pipe segments.

[0090] The sensitivity coefficient k is used to adjust the sensitivity of mutation determination. According to historical experimental data, setting k to 1.3 can effectively identify and determine pressure mutation points.

[0091] For example: The pressure gradient change intensity δ1 from the first pipeline segment to the second pipeline segment is δ1 = |T i+1 ―T i | = |0.13 - (-0.38)| = 0.51. The pressure gradient change intensity δ2 from the second pipeline segment to the third pipeline segment is δ2 = |(-0.59) - 0.13| = 0.72. If there are 10 pipeline segments in total for the pipeline, then the pressure gradient change intensity of each adjacent pipeline segment can be obtained in the same way. Assume that the adjacent pressure gradient change intensities δ1 to δ9 from the first pipeline segment to the tenth pipeline segment are 0.51, 0.72, 0.22, 0.16, 0.11, 0.45, 0.32, 0.13, 0.19 respectively. Then, excluding the maximum value and taking the average gives Since δ2 = 0.72 > 0.34 and δ1 = 0.51 > 0.34, it is determined that there is a pressure mutation point in the second pipeline segment. Because the mutation point in the second pipeline segment causes the pressure gradient change intensity from the first to the second pipeline segment and from the second to the third pipeline segment to be intense. Since δ6 = 0.45 > 0.34 and δ5 = 0.11 ≤ 0.34, it is determined that there is a pressure mutation point in the seventh pipeline segment. That is, because the mutation point in the seventh pipeline segment causes the pressure gradient change intensity from the sixth to the seventh pipeline segment to be intense rather than the sixth. Therefore, the pipeline codes of the reflux areas are 2 and 7.

[0092] Mark the pipeline segments with pressure mutation points as the pipeline codes of the reflux areas.

[0093] It should be noted that the method for adjusting the valve opening according to the reverse flow momentum coefficient and the pipeline codes of the reflux areas includes:

[0094] Query the preset pipeline connection relationship database according to the pipeline codes of the reflux areas to obtain the regulating valve associated with the pipeline segments of the reflux areas as the target valve.

[0095] Divide the pipeline segments of the reflux areas with the same target valve corresponding to the pipeline codes of the reflux areas into the same valve group, and obtain the corrected opening of the target valve for this valve group according to the reverse flow momentum coefficients of the pipeline segments of the reflux areas within the same valve group as:

[0096]

[0097] where is the initial opening of the target valve of the jth valve group, m jis the total number of pipeline segments with the pipeline code marked as the reverse flow area in the j - th valve group. is the corrected opening degree of the target valve in the j - th valve group.

[0098] Adjust the valve opening degree according to the corrected opening degree of the target valve.

[0099] For example: Query the preset pipeline connection relationship database according to the pipeline code of the reverse flow area to obtain the regulating valve associated with the 2nd pipeline segment and the 7th pipeline segment as the target valve. Since the reverse flow momentum coefficient of the 2nd pipeline segment has been obtained in the previous steps then similarly, the reverse flow momentum coefficient of the 7th pipeline segment can be obtained, assumed to be If both are associated with the same target valve, then the 2nd and 7th pipeline segments are divided into the same valve group. Obtain the initial opening degree of the target valve of this valve group, assumed to be 90%, then the corrected opening degree of this target valve can be obtained That is, adjust the target valve opening degree to 86.94%. By appropriately closing the valve to reduce the water flow, the reverse flow is slowed down and restored to the normal state.

[0100] It should be noted that before the valve opening degree is adjusted according to the corrected opening degree of the target valve, the method further includes:

[0101] Set the minimum safe opening degree of the valve. Compare the corrected opening degree of the target valve with the minimum safe opening degree of the valve. When the corrected opening degree of the target valve is less than the minimum safe opening degree, adjust the valve opening degree according to the minimum safe opening degree.

[0102] Trigger a level - three early warning when adjusting the valve opening degree according to the minimum safe opening degree.

[0103] By setting the minimum safe opening degree of the valve, it can be ensured that the valve adjustment process always remains within a safe range, avoiding processing interruption and equipment damage caused by too small an opening degree.

[0104] Embodiment 2: Based on the same inventive concept, as Figure 2 shown, this embodiment provides an industrial wastewater treatment and discharge monitoring and early warning system. The system includes: a flow monitoring module, a pressure deviation analysis module, and a reverse flow control module, and the modules are connected in sequence.

[0105] The flow monitoring module is used to obtain the first positive flow value according to the flow sensor at the front end of the wastewater discharge pipeline, obtain the second positive flow value according to the flow sensor at the rear end of the wastewater discharge pipeline, and calculate the flow difference according to the first positive flow value and the second positive flow value.

[0106] The pressure deviation analysis module is used to trigger a first-level warning and start the pipeline pressure sensor group for pressure detection to obtain the pipeline key point pressure data when the flow difference is greater than a preset first reverse flow determination threshold, and obtain the pressure deviation degree through the pipeline pressure model according to the pipeline key point pressure data.

[0107] The reverse flow control module is used to trigger a second-level warning and feedback the pipeline code of the reverse flow area when the pressure deviation degree is greater than a preset second reverse flow determination threshold, obtain the reverse flow momentum coefficient according to the pressure deviation degree and the flow difference, and adjust the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area.

[0108] It should be noted that regarding the system in the above embodiments, the specific manners in which each module performs operations have been described in detail in Embodiment 1 of the method, and will not be elaborated herein.

[0109] Finally, it should be noted that although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art may still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An industrial wastewater treatment discharge monitoring and early warning method, characterized in that, The method includes: Obtaining a first forward flow value according to a flow sensor at the front end of the wastewater discharge pipeline, obtaining a second forward flow value according to a flow sensor at the rear end of the wastewater discharge pipeline, and calculating a flow difference according to the first forward flow value and the second forward flow value; When the flow difference is greater than a preset first reverse flow determination threshold, triggering a first-level warning and starting a pipeline pressure sensor group to perform pressure detection to obtain pipeline key point pressure data, and obtaining a pressure deviation degree through a pipeline pressure model according to the pipeline key point pressure data; When the pressure deviation degree is greater than a preset second reverse flow determination threshold, triggering a second-level warning and feeding back the pipeline code of the reverse flow area, obtaining a reverse flow momentum coefficient according to the pressure deviation degree and the flow difference, and adjusting the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area.

2. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 1, wherein The method of starting the pipeline pressure sensor group to perform pressure detection to obtain pipeline key point pressure data and obtaining a pressure deviation degree through a pipeline pressure model according to the pipeline key point pressure data includes: Starting the pipeline pressure sensors set at preset key point positions on the wastewater discharge pipeline to perform pressure detection to obtain pipeline key point pressure data; Obtain the density and flow velocity of the wastewater and the basic pipeline parameters including the pipeline lengths and inner diameters between the positions of each key point, and obtain the pressure deviation degree σ through the pipeline pressure model according to the pipeline key point pressure data i It is as follows: Where P i is the pressure data of the i-th pipeline key point, P0 is the pressure data at the pipeline inlet, λ is the friction coefficient, D is the inner diameter of the pipeline, L j is the length of the j-th pipeline section, ρ is the density of the wastewater, v j is the wastewater flow velocity in the j-th pipeline section, σ i is the pressure deviation of the i-th pipeline section.

3. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 1, characterized in that The method of triggering a second-level warning and feeding back the pipeline code of the reverse flow area when the pressure deviation degree is greater than a preset second reverse flow determination threshold, obtaining a reverse flow momentum coefficient according to the pressure deviation degree and the flow difference, and adjusting the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area includes: When the pressure deviation degree is greater than a preset second reverse flow determination threshold, triggering a second-level warning and obtaining the pipeline code of the reverse flow area through the axial pressure gradient positioning method; Obtain the reverse momentum coefficient based on the pressure deviation and the flow rate difference It is as follows: where σ i is the pressure deviation degree of the i-th pipeline section, ΔQ is the flow difference, and Q f is the first positive flow value, is the reverse momentum coefficient of the i-th pipeline section; Adjusting the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area.

4. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 3, characterized in that The method of obtaining the pipeline code of the reverse flow area through the axial pressure gradient positioning method includes: Obtain the pressure data of the key points of the pipeline and calculate the pressure gradient of the pipeline section T i It is: where P i is the pressure value detected by the i-th pressure sensor, P i―1 is the pressure value detected by the (i - 1)-th pressure sensor, L i is the pipeline segment length of the i-th pipeline segment, T i is the pipeline segment pressure gradient of the i-th pipeline segment; Obtaining a pressure mutation point according to the pressure gradient of each pipeline section through a mutation point determination rule, and taking the code of the pipeline corresponding to the pressure mutation point as the pipeline code of the reverse flow area.

5. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 4, wherein The method of obtaining a pressure mutation point according to the pressure gradient of each pipeline section through a mutation point determination rule and taking the code of the pipeline corresponding to the pressure mutation point as the pipeline code of the reverse flow area includes: Calculating the pressure gradient change intensity δ of adjacent pipeline sections according to the pressure gradient of each pipeline section as: δ i = |T i+1 ―T i |; where T i+1 is the pressure gradient of the (i + 1)-th pipeline section, and δ i is the intensity of the change in the pressure gradient from the i-th pipeline section to the (i + 1)-th pipeline section; Judging according to the pressure gradient change intensity of each pipeline section as follows: When and then it is determined that there is a pressure mutation point in the i-th pipeline segment; When and then it is determined that there is a pressure mutation point in the (i + 1)-th pipeline segment; where δ i―1 is the pressure gradient change intensity from the (i - 1)-th pipeline segment to the i-th pipeline segment, k is the sensitivity coefficient, N is the total number of pipeline segments, and δ max is the maximum value of the pressure gradient change intensity of all pipeline segments; Marking the code of the pipeline section with a pressure mutation point as the pipeline code of the reverse flow area.

6. The industrial wastewater treatment and discharge monitoring and early warning method according to claim 3, wherein The method of adjusting the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area includes: Querying a preset pipeline connection relationship database according to the pipeline code of the reverse flow area to obtain a regulating valve associated with the pipeline section of the reverse flow area as the target valve; Divide the pipeline segments in the reflux zone whose corresponding target valves for the pipeline codes in the reflux zone are the same target valve into the same valve group, and obtain the corrected opening of the target valve for this valve group according to the reverse flow momentum coefficients of the pipeline segments in the same valve group. It is: where is the initial opening of the target valve of the j-th valve group, m j is the total number of pipeline segments marked with the pipeline code of the reverse flow area in the j-th valve group is the corrected opening of the target valve of the j-th valve group; Adjusting the valve opening according to the corrected opening of the target valve.

7. The industrial wastewater treatment discharge monitoring and early warning method according to claim 6, characterized in that Before adjusting the valve opening according to the corrected opening of the target valve, the method further includes: Setting a minimum safe opening of the valve, comparing the corrected opening of the target valve with the minimum safe opening of the valve, and when the corrected opening of the target valve is less than the minimum safe opening, adjusting the valve opening according to the minimum safe opening; Triggering a third-level warning when adjusting the valve opening according to the minimum safe opening.

8. An industrial wastewater treatment and discharge monitoring and early warning system for implementing the method according to any one of claims 1-7, characterized in that, The system includes: a flow monitoring module, a pressure deviation analysis module, and a reverse flow control module, and the modules are connected in sequence; The flow monitoring module is used to obtain a first forward flow value according to the flow sensor at the front end of the wastewater discharge pipeline, obtain a second forward flow value according to the flow sensor at the rear end of the wastewater discharge pipeline, and calculate a flow difference according to the first forward flow value and the second forward flow value; The pressure deviation analysis module is used to trigger a first-level warning and start the pipeline pressure sensor group for pressure detection to obtain pipeline key point pressure data when the flow difference is greater than a preset first reverse flow determination threshold, and obtain a pressure deviation degree through a pipeline pressure model according to the pipeline key point pressure data; The reverse flow control module is used to trigger a second-level warning and feedback the pipeline code of the reverse flow area when the pressure deviation degree is greater than a preset second reverse flow determination threshold, obtain a reverse flow momentum coefficient according to the pressure deviation degree and the flow difference, and adjust the valve opening according to the reverse flow momentum coefficient and the pipeline code of the reverse flow area.

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