A method and system for preventing sedimentation in a sewage pipe network with sequential batch storage and discharge

Abstract

The present invention relates to a method and system for preventing sedimentation in a sequential batch storage and discharge sewage pipe network. The present invention includes determining the maximum allowable water storage level and the minimum allowable discharge level of each sewage pumping station according to the adverse overflow points and leakage points within the upstream service range of each sewage pumping station; determining the corresponding upstream discharge water volume growth mutation point according to the historical change law of the flow rate of each sewage pumping station; determining the order of each sewage pumping station to perform a water storage-drainage mode according to the drainage path of each sewage pumping station and the upstream discharge water volume growth mutation point; adjusting the operation mode and pumping flow rate of the remaining sewage pumping stations according to the drainage path and operation mode of each sewage pumping station; when each sewage pumping station performs a water storage-drainage mode, real-time monitoring of its liquid level changes, and controlling the operation state of the corresponding lift pump according to the liquid level changes of each sewage pumping station and the corresponding maximum allowable water storage level and minimum allowable discharge level. The present invention can effectively improve the efficiency of pollutant collection and transfer.

Description

Technical Field

[0001] The present invention relates to the technical field of urban drainage and sewage treatment, and in particular to a method and system for preventing sedimentation in a sequential batch storage and drainage sewage pipe network. Background Art

[0002] The existing sewage system has low operating efficiency, high energy consumption, and prominent problems such as low centralized collection rate of urban domestic sewage and low BOD (biochemical oxygen demand) concentration of sewage treatment plant inlet. Many cities are facing pathological operation problems such as infiltration of clean water inflow, low flow rate sedimentation in pipelines, and high liquid level overflow in dry seasons, which seriously restrict the normal functioning of sewage collection and treatment systems and the improvement of overall efficiency.

[0003] Based on the actual needs of improving the efficiency of sewage collection and treatment, the implementation of sewage network joint dispatching technology strategies to control key parameters such as sewage pipe operating level and flow rate is an effective means to improve the efficiency of pollutant collection and transfer. Domestic and foreign researchers have conducted a lot of research on sewage network optimization and dispatching, but they still face many technical difficulties in actual application. On the one hand, sewage pumping stations are generally located at the end of the area collection system. Due to the low terrain and deep burial depth, the inlet pipelines are affected by multiple factors such as high surface water and groundwater levels. It is difficult to achieve a low liquid level and high flow rate operation state through a simple large-flow pumping mode, which may increase the risk of clean water invading the sewage system. On the other hand, most of the existing scheduling schemes adopt a fixed mode. The scheduling of sewage pumping stations is mainly based on saving electricity costs. The control of low-flow deposition problems in sewage pipe networks has not yet been considered, and it is difficult to take into account the dual goals of improving pollutant collection efficiency and saving energy consumption in pumping stations. In addition, traditional scheduling methods usually use a rough time division method to control the operation of pumping stations, which fails to fully utilize the dynamic changes in actual sewage flow and the coordination relationship between various pumping station systems. There is a lack of flexible and accurate scheduling strategies in the complex sewage pipe network system to cope with diverse operating needs and sudden changes.

[0004] In summary, the existing sewage pump station scheduling model has significant deficiencies in targeting, accuracy and dynamic adaptability, which not only restricts the operating efficiency of the sewage system, but also increases the risk of system operation and maintenance management. Summary of the invention

[0005] To this end, the present invention provides a method and system for preventing sedimentation in a sewage pipe network with sequential storage and discharge. In combination with the sewage discharge law, the high-flow drainage period of the sewage pumping station is innovatively coupled with the sewage discharge peak period, and a sequential batch water storage and drainage alternating operation mode is adopted to realize an anti-sedimentation control strategy under the coordinated operation of multiple sewage pumping stations. While effectively improving the sewage collection and transfer efficiency, it solves the system operation problem under high risk of external water intrusion, and provides a highly efficient and practical technical solution for the drainage industry.

[0006] In order to solve the above technical problems, the present invention provides a method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage, comprising:

[0007] Determine the maximum allowable water storage level and the minimum allowable discharge level of each sewage pumping station according to the adverse overflow points and leakage points within the upstream service range of each sewage pumping station, wherein a plurality of the sewage pumping stations are connected to the sewage treatment system in series / parallel through sewage pipes, and each of the sewage pumping stations is equipped with a plurality of lifting pumps;

[0008] According to the historical change law of the flow rate of each sewage pumping station, the corresponding upstream discharge water volume growth mutation point is determined, and the upstream discharge water volume growth mutation point is the period when the ratio of the hourly flow rate to the daily average flow rate is the maximum value;

[0009] Determine the order of the sewage pumping stations to perform the water storage-drainage mode according to the drainage paths of the sewage pumping stations and the sudden change point of the upstream discharged water volume growth;

[0010] According to the drainage path and operation mode of each sewage pumping station, the operation mode and pumping flow rate of the remaining sewage pumping stations are adjusted;

[0011] When each sewage pumping station is in the water storage-drainage mode, its liquid level changes are monitored in real time, and the operating status of the corresponding lifting pump is controlled according to the liquid level changes of each sewage pumping station and the corresponding maximum allowable water storage level and the minimum allowable discharge level.

[0012] In one embodiment of the present invention, according to the historical change law of the flow rate of each sewage pumping station, the corresponding upstream discharge water volume growth mutation point is determined, including:

[0013] The daily variation data of at least 30 consecutive dry days with a time interval of no more than 5 minutes shall be used as historical monitoring data.

[0014] In one embodiment of the present invention, the order of the sewage pumping stations to perform the water storage-drainage mode is determined according to the drainage path of each sewage pumping station and the sudden change point of the upstream discharged water volume growth, including:

[0015] When a plurality of the sewage pumping stations belong to different drainage paths and the time range of the mutation point of the upstream discharge water volume growth overlaps, they are planned into different batches for water storage-drainage mode;

[0016] When multiple sewage pumping stations belong to the same drainage path, they are planned to be in water storage-drainage mode in adjacent time periods, and operated in the order of upstream first and downstream later, and the drainage period of the sewage pumping station located upstream is used as the water storage period of the sewage pumping station located downstream.

[0017] In one embodiment of the present invention, it also includes:

[0018] The total flow rate of each of the sewage pumping stations is less than or equal to the treatment capacity of the sewage treatment system;

[0019] When a sewage pumping station exceeds the treatment capacity of the sewage treatment system during the water storage-drainage mode, the pumping flow value of the sewage pumping station in other drainage paths shall be reduced first. If the requirements are still not met, the maximum pumping flow value of the sewage pumping station shall be reduced.

[0020] In one embodiment of the present invention, according to the drainage path and operation mode of each of the sewage pumping stations, the operation mode and pumping flow rate of the remaining sewage pumping stations are adjusted, including:

[0021] When the multiple sewage pumping stations belong to different drainage paths, when the sewage pumping station of one drainage path is in the water storage mode, the sewage pumping stations of the other drainage paths increase the pumping flow of the corresponding lift pumps; when the sewage pumping station of one drainage path is in the drainage mode, the sewage pumping stations of the other drainage paths reduce the pumping flow of the corresponding lift pumps.

[0022] In one embodiment of the present invention, it also includes:

[0023] When a plurality of the sewage pumping stations belong to the same drainage path, the maximum allowable water storage level of the drainage path during the water storage-drainage mode is jointly determined by the sewage pumping station located upstream and the sewage pumping station located downstream.

[0024] In one embodiment of the present invention, according to the liquid level change of the sewage pump station, and the corresponding maximum allowable water storage level and the minimum allowable discharge level, controlling the operating state of the corresponding lift pump includes:

[0025] The sewage pumping station that enters the water storage-discharge mode starts the water storage mode at the sudden increase point of the discharged water volume, and gradually shuts down the operating lifting pump of the corresponding sewage pumping station;

[0026] In response to the liquid level value of the sewage pumping station reaching the maximum allowable water storage level, the drainage mode is started, and all the lifting pumps allowed to be used in the corresponding sewage pumping station are turned on;

[0027] In response to the liquid level value of the sewage pumping station dropping to the minimum allowable discharge water level, the booster pumps of the corresponding sewage pumping station are gradually shut down until they are restored to normal operation.

[0028] In one embodiment of the present invention, it also includes:

[0029] According to the overflow of the front-end sewage pipe and the change of the pumping flow rate of each sewage pumping station during the water storage-drainage mode, the maximum allowable water storage level and the minimum allowable discharge level of the corresponding sewage pumping station are adjusted. According to the upstream drainage law and the actual maximum allowable flow rate of each sewage pumping station, the sudden change point of the discharge volume growth and the number of booster pumps to be opened are adjusted, including:

[0030] According to the overflow of the front-end sewage pipe and the change of the pumping flow rate of each sewage pumping station during the water storage-drainage mode, the maximum allowable water storage level and the minimum allowable discharge level of the corresponding sewage pumping station are adjusted. According to the upstream drainage law and the actual maximum allowable flow rate of each sewage pumping station, the sudden change point of the discharge volume growth and the number of booster pumps to be opened are adjusted, including:

[0031] When an overflow point appears in the front sewage pipe of the sewage pump station during the water storage mode, lowering the maximum allowable water storage level of the corresponding sewage pump station;

[0032] When the pumping flow of the sewage pumping station continues to show no downward trend during the drainage mode, raising the minimum allowable discharge water level of the corresponding sewage pumping station;

[0033] When the upstream drainage law of the sewage pumping station changes, the sudden change point of the discharged water volume is corrected;

[0034] When the actual maximum allowable flow rate of the downstream pipeline of the sewage pumping station cannot meet the maximum pumping and drainage flow rate of the water storage-drainage mode, reduce the number of lift pumps that are turned on.

[0035] In one embodiment of the present invention, the water storage-drainage mode of each sewage pumping station is performed on dry days, and the water storage-drainage mode of all sewage pumping stations is suspended in case of rainfall, including:

[0036] Under rainfall conditions, each of the sewage pumping stations discharges water in a conventional mode or switches to a rainfall mode;

[0037] 48 hours after the rainfall ends, each sewage pumping station will perform water storage-drainage mode according to a predetermined order and mode.

[0038] The present invention also provides a sequential batch storage and drainage sewage pipe network sedimentation prevention system, comprising: a sewage treatment system, a control platform and a plurality of sewage pumping stations, each of which is equipped with a flow meter, a liquid level meter and a lifting pump, and a plurality of the sewage pumping stations are connected to the sewage treatment system in series / parallel through sewage pipes, and the sewage treatment system, the flow meter, the liquid level meter and the lifting pump of the sewage pumping station are respectively connected to the control platform for communication; wherein, the control platform comprises:

[0039] The maximum allowable water storage level and the minimum allowable water discharge level determination module is used to determine the maximum allowable water storage level and the minimum allowable water discharge level of each sewage pumping station according to the adverse overflow points and leakage points within the upstream service range of each sewage pumping station;

[0040] The upstream discharge water volume growth mutation point determination module is used to determine the corresponding upstream discharge water volume growth mutation point according to the historical change law of the flow of each sewage pumping station. The upstream discharge water volume growth mutation point is the period when the ratio of the hourly flow rate to the daily average flow rate is the maximum value;

[0041] A water storage-drainage mode order determination module, used to determine the order of the water storage-drainage mode of each sewage pumping station according to the drainage path of each sewage pumping station and the sudden change point of the upstream discharged water volume growth;

[0042] An operation mode and pumping flow rate adjustment module, used to adjust the operation mode and pumping flow rate of the remaining sewage pumping stations according to the drainage path and operation mode of each sewage pumping station;

[0043] A lift pump operation state control module is used to monitor the liquid level changes of each sewage pump station in real time when the sewage pump station is in a water storage-drainage mode on dry days, and control the operation state of the corresponding lift pump according to the liquid level changes of each sewage pump station and the corresponding maximum allowable water storage level and minimum allowable discharge level;

[0044] A dynamic adjustment module is used to adjust the maximum allowable water storage level and the minimum allowable discharge level of the corresponding sewage pumping station according to the overflow of the front-end sewage pipe and the change of the pumping flow rate during the water storage-drainage mode of each sewage pumping station, and adjust the mutation point of the discharge water growth and the number of booster pumps to be opened according to the upstream drainage law and the actual maximum allowable flow of each sewage pumping station. According to the overflow of the front-end sewage pipe and the change of the pumping flow rate of each sewage pumping station during the water storage-drainage mode, the maximum allowable water storage level and / or the minimum allowable discharge water level and / or the mutation point of the discharge water growth and / or the number of booster pumps to be opened of the corresponding sewage pumping station.

[0045] The above technical solution of the present invention has the following advantages compared with the prior art:

[0046] The method and system for preventing sedimentation in a sequentially stored and discharged sewage pipe network described in the present invention optimizes the operation mode of the pump station in combination with the sewage discharge law, and improves the operating flow rate of the sewage pipe in stages by accurately dividing the water storage and flushing time periods, thereby preventing and controlling the low-flow rate sedimentation of pollutants during sewage transfer, effectively improving the pollutant collection efficiency, reducing the risk of pipeline overflow, and enhancing the stability and operational reliability of the system.

[0047] Through the dynamic regulation of sequential batch water storage and flushing, the pump station can achieve reasonable liquid level and high flow rate operation under high risk of external water intrusion, avoiding the problem of external water intrusion caused by relying solely on large-flow pumping, while reducing the energy consumption of pump station equipment and extending the service life of the facilities.

[0048] The present invention aims at complex sewage pipe network systems and adopts a flexible scheduling strategy to achieve the coordinated operation of multiple pump stations, effectively balance the load of the sewage treatment plant, avoid overload during peak periods or waste during trough periods, improve the overall efficiency and adaptability of the entire sewage treatment system, and can effectively control the problem of pollutant deposition in the sewage pipe network and improve the efficiency of pollutant collection and transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0050] Figure 1 The present invention is a flow chart of a method for preventing sedimentation in a sewage pipe network with sequential batch storage and discharge.

[0051] Figure 2 It is a structural schematic diagram of a sewage pipe network sedimentation prevention system for sequential batch storage and discharge according to the present invention. DETAILED DESCRIPTION

[0052] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0053] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0054] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0055] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0056] Example 1

[0057] Reference Figure 1 As shown, a method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage of the present invention comprises:

[0058] S1. Determine the maximum allowable water storage level (L) of each sewage pumping station based on the adverse overflow points and leakage points within the upstream service range of each sewage pumping station. 高 ) and the minimum allowable discharge water level (L 低 ), wherein a plurality of the sewage pumping stations are connected in series / parallel through sewage pipes to a sewage treatment system (sewage treatment plant), and each of the sewage pumping stations is equipped with a plurality of lifting pumps.

[0059] It can be understood that an unfavorable overflow point refers to a certain position or node in the pipe network. If the upstream and downstream water levels are too high, the risk of overflowing from this point will first occur and overflow into the environment or the surface; a leakage point refers to a weak point in the sewage system where external water (surface water, groundwater, rainwater, etc.) invades or sewage leaks out; the minimum allowable discharge water level (L 低 ) refers to the lowest water level threshold to which the water level of the sewage pumping station is lowered. When this water level is reached or lower than this level, the current centralized drainage process will be ended and the system will enter normal working state.

[0060] S2. According to the historical change pattern of the flow rate of each sewage pumping station, the corresponding upstream discharge water volume growth mutation point (T) is determined. The upstream discharge water volume growth mutation point is the period when the ratio of the hourly flow rate to the daily average flow rate is the maximum.

[0061] Exemplarily, daily variation data of drought conditions continuously monitored for at least 30 days with a time interval not exceeding 5 minutes are used as historical monitoring data.

[0062] S3. Determine the order in which each sewage pumping station performs a water storage-drainage mode according to the drainage path of each sewage pumping station and the sudden increase point of the upstream discharged water volume.

[0063] It is understandable that each sewage pumping station starts the water storage-drainage operation mode periodically in a predetermined order, and operates in a normal mode the rest of the time on the premise of ensuring the transfer capacity of the upstream and downstream sewage pumping stations and the treatment capacity of the sewage treatment plant.

[0064] Specifically, when a plurality of the sewage pumping stations belong to different drainage paths and the time periods of the upstream discharge water volume growth mutation points overlap, they are planned into different batches for water storage-drainage mode;

[0065] When multiple sewage pumping stations belong to the same drainage path, they are planned to be in water storage-drainage mode in adjacent time periods, and operated in the order of upstream first and downstream later, and the drainage period of the sewage pumping station located upstream is used as the water storage period of the sewage pumping station located downstream.

[0066] It should be noted that when multiple sewage pumping stations belong to different drainage paths, the sewage between them will eventually flow to the same sewage treatment system. If they are in water storage-drainage mode at the same time, it is easy to cause a large amount of drainage at the same time, resulting in an instantaneous total drainage flow that is too large, exceeding the treatment capacity of the sewage treatment plant. Therefore, they are planned to be divided into different batches for water storage-drainage mode to avoid overlapping of large flow discharge periods. Some pumping stations store water first and then discharge, while other pumping stations lag or stagger discharge time, reducing the load peak, while each can perform phased flushing in the pipe network to prevent sedimentation.

[0067] When multiple sewage pumping stations belong to the same drainage path, there is a series relationship between the upstream and downstream. If the upstream and downstream pumping stations discharge water at a large flow rate at the same time, it may form a superimposed overload in the downstream pipeline, which is not conducive to controlling the sedimentation of the upstream section of the pipeline. Therefore, the upstream sewage pumping station is first allowed to concentrate on draining and flushing the pipeline. The downstream sewage pumping station is temporarily in a water storage state during this period to make room for the downstream pipeline for the flushing water discharged from the upstream. After the upstream drainage is completed, the downstream sewage pumping station will drain again. The upstream and downstream discharge in sequence, which can form a continuous high flow rate on the entire pipeline, which is more efficient and avoids local overload.

[0068] In addition, since the total flow of each sewage pump station needs to be less than or equal to the treatment capacity of the sewage treatment system (Q A ); Therefore, when a sewage pumping station exceeds the treatment capacity of the sewage treatment system during the water storage-drainage mode, the pumping flow value of the sewage pumping station in other drainage paths shall be reduced first. If the requirements are still not met, the maximum pumping flow value of the sewage pumping station shall be reduced (Q max ).

[0069] S4. According to the drainage path and operation mode of each sewage pumping station, the operation mode and pumping flow rate of the remaining sewage pumping stations are adjusted.

[0070] It is understandable that the operation mode and pumping flow rate of other pumping stations during the water storage-discharge period of a sewage pumping station can be calculated based on the transfer capacity of the upstream and downstream sewage pumping stations and the treatment capacity of the sewage treatment plant.

[0071] Specifically, when the multiple sewage pumping stations belong to different drainage paths, when the sewage pumping station of a certain drainage path is in the water storage mode, the sewage pumping stations of the other drainage paths increase the pumping flow of the corresponding lift pump; when the sewage pumping station of a certain drainage path is in the drainage mode, the sewage pumping stations of the other drainage paths reduce the pumping flow of the corresponding lift pump.

[0072] For example, when pump station C on path one is in the water storage stage, pump station D on path two can appropriately increase the number of lift pumps that are opened to pump out more sewage and reduce accumulation; when pump station C enters the drainage mode, in order to prevent the total drainage volume from being too large, pump station D will reduce the drainage flow rate and stagger the discharge.

[0073] When multiple sewage pumping stations belong to the same drainage path, the maximum allowable water storage level of the drainage path during the water storage-drainage mode is jointly determined by the sewage pumping station located upstream and the sewage pumping station located downstream. Since the pumping stations on the same path are connected in series, if the water storage level of the upstream pumping station is set too high, and the water storage capacity or drainage capacity of the downstream pumping station is insufficient, it may cause flooding or overflow of the upstream or intermediate pipelines. The upstream and downstream pumping stations jointly determine the maximum water storage level during the storage and drainage mode, which must ensure that the water storage has sufficient flushing effect and prevent overflow caused by excessively high liquid levels; and when the upstream discharges large amounts of water, the downstream can promptly accept the corresponding flow.

[0074] S5. When each of the sewage pumping stations is in the water storage-drainage mode, its liquid level change is monitored in real time, and the operating status of the corresponding booster pump is controlled according to the liquid level change of each of the sewage pumping stations, and the corresponding maximum allowable water storage level and the minimum allowable discharge level.

[0075] It should be noted that within the service area of ​​the sewage pumping station implementing the water storage-drainage mode, there should be no rainfall events of more than 5 mm within 48 consecutive hours to avoid the impact of rainfall on drainage patterns and adverse leakage points.

[0076] Therefore, the water storage-drainage mode of each of the sewage pumping stations is carried out on dry days. In case of rainfall, the water storage-drainage mode of all sewage pumping stations will be suspended, including:

[0077] Under rainfall conditions, each of the sewage pumping stations drains water in a normal mode or switches to a rainfall mode; the normal mode refers to the standard operating mode of the sewage pumping station under dry weather conditions with no rainfall or very little rainfall; the rainfall mode refers to the emergency operating mode of the sewage pumping station under rainfall or heavy rainfall conditions;

[0078] 48 hours after the rainfall ends, each sewage pumping station will perform water storage-drainage mode according to a predetermined order and mode.

[0079] Specifically, the sewage pumping station that enters the water storage-drainage mode starts the water storage mode at the sudden point of increase in the discharged water volume, and gradually shuts down the running booster pumps of the corresponding sewage pumping station; when the sewage pumping station is operating normally, one or more booster pumps may be in the on state. In order to avoid sudden water level rise or impact caused by instantaneous shutdown of all pumps, they need to be shut down gradually.

[0080] In response to the liquid level value of the sewage pumping station reaching the maximum allowable water storage level, the drainage mode is activated and all the lifting pumps allowed to be used in the corresponding sewage pumping station are turned on; the accumulated sewage can be discharged quickly.

[0081] In response to the liquid level value of the sewage pumping station dropping to the minimum allowable discharge water level, the booster pumps of the corresponding sewage pumping station are gradually shut down until they are restored to normal operation.

[0082] S6. According to the overflow of the front-end sewage pipe and the change of the pumping flow rate of each sewage pumping station during the water storage-drainage mode, the maximum allowable water storage level and the minimum allowable discharge level of the corresponding sewage pumping station are adjusted; according to the upstream drainage rules of each sewage pumping station and the actual maximum allowable flow rate, the sudden change point of the discharged water volume growth and the number of booster pumps to be opened are adjusted.

[0083] Specifically, when an overflow point occurs in the front sewage pipe of the sewage pump station during the water storage mode, the maximum allowable water storage level of the corresponding sewage pump station is lowered;

[0084] When the pumping flow of the sewage pumping station continues to show no downward trend during the drainage mode, the minimum allowable discharge water level of the corresponding sewage pumping station is increased.

[0085] It should be noted that when the sewage pump station is storing water, the front-end pipeline overflows or the liquid level approaches the dangerous water level, which means that the originally set L 高 Too high, by reducing L 高 If the flow rate of the sewage pump station remains high during the drainage mode but the pumping flow rate does not show a downward trend, if the original L is maintained 低 , which may further cause external water such as surface water and groundwater to infiltrate the sewage pipe network. L can be appropriately increased while ensuring safety. 低 Or add a booster pump to reduce the pumping flow rate.

[0086] In addition, when the drainage pattern upstream of the pumping station (i.e., the historical monitoring data of 30 days of drought) changes, it indicates that there is an error or change in the mutation point (T) of the upstream water discharge growth, and correction is needed (advance or delay the T period as needed).

[0087] When the actual maximum allowable flow rate of the downstream pipeline of the sewage pumping station cannot meet the maximum pumping flow rate of the water storage-drainage mode, reduce the number of lift pumps that are turned on. It should be noted that the actual maximum allowable flow rate of the downstream pipeline of the sewage pumping station should be based on the theoretical allowable discharge flow rate, and further consider factors such as pipeline aging and discharge flow safety factor to verify the actual flow rate to ensure the total pumping flow rate N·Q 泵 ≤Q 管道 .

[0088] Example 2

[0089] A certain service area includes sewage pumping stations C, D, E, and F, which enter the sewage treatment plant (A) through three discharge paths. C and D are in the same discharge path, and E and F are distributed in separate discharge paths. Through overflow points, leakage points and historical change data, the pumping station control water level and the time period of the sudden change point of the discharge water volume are determined as shown in the following table.

[0090] Table 1: Pumping station control water level and discharge water volume growth mutation point period

[0091]

[0092] Determine the operation cycle and sequence of each pump station's water storage-discharge mode in one step:

[0093] 1. During the operation of C and D pumping stations, the pumping flow control mode of each pumping station is shown in the following table.

[0094] Table 2: Pumping flow control mode of each pumping station during the operation of C and D pumping stations

[0095]

[0096] 2. During the operation of E pump station, the pumping and drainage flow control mode of each pump station is shown in the following table.

[0097] Table 3: Pumping flow control mode of each pumping station during the operation of E pumping station

[0098]

[0099] 3. During the operation of F pump station, the pumping and drainage flow control mode of each pump station is shown in the following table.

[0100] Table 4: Pumping flow control mode of each pumping station during the operation of F pumping station

[0101]

[0102] Example 3

[0103] Based on the same inventive concept, this embodiment provides a system for preventing sedimentation in a sewage pipe network with sequential storage and discharge. The principle of solving the problem is similar to the method for preventing sedimentation in a sewage pipe network with sequential storage and discharge, and the repeated parts will not be repeated.

[0104] Reference Figure 2 As shown, this embodiment provides a sewage pipe network sedimentation prevention system for sequential batch storage and discharge, comprising:

[0105] A sewage treatment system (A), a control platform (B) (including a communication module, a data processing module and a control module) and a plurality of sewage pumping stations (C, D, ..., Z), each of which is equipped with a flow meter, a liquid level meter and a lifting pump, and a plurality of the sewage pumping stations are connected to the sewage treatment system in series / parallel through sewage pipes, and the sewage treatment system, the flow meter, the liquid level meter and the lifting pump of the sewage pumping station are respectively connected to the control platform for communication; wherein the control platform comprises:

[0106] The maximum allowable water storage level and the minimum allowable water discharge level determination module is used to determine the maximum allowable water storage level and the minimum allowable water discharge level of each sewage pumping station according to the adverse overflow points and leakage points within the upstream service range of each sewage pumping station;

[0107] The upstream discharge water volume growth mutation point determination module is used to determine the corresponding upstream discharge water volume growth mutation point according to the historical change law of the flow of each sewage pumping station. The upstream discharge water volume growth mutation point is the period when the ratio of the hourly flow rate to the daily average flow rate is the maximum value;

[0108] A water storage-drainage mode order determination module, used to determine the order of the water storage-drainage mode of each sewage pumping station according to the drainage path of each sewage pumping station and the sudden change point of the upstream discharged water volume growth;

[0109] An operation mode and pumping flow rate adjustment module, used to adjust the operation mode and pumping flow rate of the remaining sewage pumping stations according to the drainage path and operation mode of each sewage pumping station;

[0110] A lift pump operation state control module is used to monitor the liquid level changes of each sewage pump station in real time when the sewage pump station is in a water storage-drainage mode on dry days, and control the operation state of the corresponding lift pump according to the liquid level changes of each sewage pump station and the corresponding maximum allowable water storage level and minimum allowable discharge level;

[0111] The dynamic adjustment module is used to adjust the maximum allowable water storage level and the minimum allowable discharge level of the corresponding sewage pumping station according to the overflow of the front-end sewage pipe and the change of the pumping flow during the water storage-drainage mode of each sewage pumping station, and adjust the sudden change point of the discharge water growth and the number of booster pumps to be opened according to the upstream drainage rules of each sewage pumping station and the actual maximum allowable flow.

[0112] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0113] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0114] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0116] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for preventing sedimentation in a sewage pipe network with sequential batch storage and discharge, characterized in that: include: Determine the maximum allowable water storage level and the minimum allowable discharge level of each sewage pumping station according to the adverse overflow points and leakage points within the upstream service range of each sewage pumping station, wherein a plurality of the sewage pumping stations are connected to the sewage treatment system in series / parallel through sewage pipes, and each of the sewage pumping stations is equipped with a plurality of lifting pumps; According to the historical change law of the flow rate of each sewage pumping station, the corresponding upstream discharge water volume growth mutation point is determined, and the upstream discharge water volume growth mutation point is the period when the ratio of the hourly flow rate to the daily average flow rate is the maximum value; Determine the order of the sewage pumping stations to perform the water storage-drainage mode according to the drainage paths of the sewage pumping stations and the sudden change point of the upstream discharged water volume growth; According to the drainage path and operation mode of each sewage pumping station, the operation mode and pumping flow rate of the remaining sewage pumping stations are adjusted; When each of the sewage pumping stations is in a water storage-drainage mode, the liquid level change is monitored in real time, and the operation state of the corresponding lift pump is controlled according to the liquid level change of each of the sewage pumping stations, and the corresponding maximum allowable water storage level and the minimum allowable discharge level; According to the drainage path of each sewage pumping station and the sudden change point of the upstream water discharge volume growth, the order of each sewage pumping station to perform the water storage-drainage mode is determined, including: When a plurality of the sewage pumping stations belong to different drainage paths and the time range of the mutation point of the upstream discharge water volume growth overlaps, they are planned into different batches for water storage-drainage mode; When multiple sewage pumping stations belong to the same drainage path, they are planned to be stored and drained in adjacent time periods, and are operated in the order of upstream first and downstream later, with the drainage period of the sewage pumping station located upstream being used as the water storage period of the sewage pumping station located downstream; Also includes: The total flow rate of each of the sewage pumping stations is less than or equal to the treatment capacity of the sewage treatment system; When a sewage pumping station exceeds the treatment capacity of the sewage treatment system during the water storage-drainage mode, the pumping flow value of the sewage pumping station in other drainage paths shall be reduced first. If the requirements are still not met, the maximum pumping flow value of the sewage pumping station shall be reduced.

2. A method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage according to claim 1, characterized in that: According to the historical change law of the flow rate of each sewage pumping station, the corresponding upstream discharge water volume growth mutation point is determined, including: The daily variation data of at least 30 consecutive dry days with a time interval of no more than 5 minutes shall be used as historical monitoring data.

3. A method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage according to claim 1, characterized in that: According to the drainage path and operation mode of each sewage pumping station, the operation mode and pumping flow rate of the remaining sewage pumping stations are adjusted, including: When the multiple sewage pumping stations belong to different drainage paths, when the sewage pumping station of one drainage path is in the water storage mode, the sewage pumping stations of the other drainage paths increase the pumping flow of the corresponding lift pumps; when the sewage pumping station of one drainage path is in the drainage mode, the sewage pumping stations of the other drainage paths reduce the pumping flow of the corresponding lift pumps.

4. A method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage according to claim 3, characterized in that: Also includes: When a plurality of the sewage pumping stations belong to the same drainage path, the maximum allowable water storage level of the drainage path during the water storage-drainage mode is jointly determined by the sewage pumping station located upstream and the sewage pumping station located downstream.

5. The method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage according to claim 1, characterized in that: According to the liquid level change of the sewage pump station, and the corresponding maximum allowable water storage level and the minimum allowable discharge level, controlling the operation state of the corresponding lift pump includes: The sewage pumping station that enters the water storage-discharge mode starts the water storage mode at the sudden increase point of the discharged water volume, and gradually shuts down the operating lifting pump of the corresponding sewage pumping station; In response to the liquid level value of the sewage pumping station reaching the maximum allowable water storage level, the drainage mode is started, and all the lifting pumps allowed to be used in the corresponding sewage pumping station are turned on; In response to the liquid level value of the sewage pumping station dropping to the minimum allowable discharge water level, the booster pumps of the corresponding sewage pumping station are gradually shut down until they are restored to normal operation.

6. A method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage according to claim 1, characterized in that: Also includes: According to the overflow of the front-end sewage pipe and the change of the pumping flow rate of each sewage pumping station during the water storage-drainage mode, the maximum allowable water storage level and the minimum allowable discharge level of the corresponding sewage pumping station are adjusted. According to the upstream drainage law and the actual maximum allowable flow rate of each sewage pumping station, the sudden change point of the discharge volume growth and the number of booster pumps to be opened are adjusted, including: When an overflow point appears in the front sewage pipe of the sewage pump station during the water storage mode, lowering the maximum allowable water storage level of the corresponding sewage pump station; When the pumping flow of the sewage pumping station continues to show no downward trend during the drainage mode, raising the minimum allowable discharge water level of the corresponding sewage pumping station; When the upstream drainage pattern of the sewage pumping station changes, the sudden change point of the discharged water volume growth is corrected; When the actual maximum allowable flow rate of the downstream pipeline of the sewage pumping station cannot meet the maximum pumping and drainage flow rate of the water storage-drainage mode, reduce the number of lift pumps that are turned on.

7. A method for preventing sedimentation in a sewage pipe network for sequential batch storage and drainage according to claim 1, characterized in that: Also includes: The water storage-drainage mode of each of the above-mentioned sewage pumping stations is carried out on dry days. In case of rainfall, the water storage-drainage operation mode of all sewage pumping stations will be suspended, including: Under rainfall conditions, each of the sewage pumping stations discharges water in a conventional mode or switches to a rainfall mode; 48 hours after the rainfall ends, each sewage pumping station will perform water storage-drainage mode according to a predetermined order and mode.

8. A system for preventing sedimentation in a sewage pipe network with sequential batch storage and discharge, adopting a method for preventing sedimentation in a sewage pipe network with sequential batch storage and discharge as claimed in any one of claims 1 to 7, characterized in that: include: A sewage treatment system, a control platform and several sewage pumping stations, each of which is equipped with a flow meter, a liquid level meter and a lifting pump. A plurality of the sewage pumping stations are connected to the sewage treatment system in series / parallel through sewage pipes. The sewage treatment system, the flow meter, the liquid level meter and the lifting pump of the sewage pumping station are respectively connected to the control platform for communication; wherein the control platform includes: The maximum allowable water storage level and the minimum allowable water discharge level determination module is used to determine the maximum allowable water storage level and the minimum allowable water discharge level of each sewage pumping station according to the adverse overflow points and leakage points within the upstream service range of each sewage pumping station; The upstream discharge water volume growth mutation point determination module is used to determine the corresponding upstream discharge water volume growth mutation point according to the historical change law of the flow of each sewage pumping station. The upstream discharge water volume growth mutation point is the period when the ratio of the hourly flow rate to the daily average flow rate is the maximum value; A water storage-drainage mode order determination module, used to determine the order of the water storage-drainage mode of each sewage pumping station according to the drainage path of each sewage pumping station and the sudden change point of the upstream discharged water volume growth; An operation mode and pumping flow rate adjustment module, used to adjust the operation mode and pumping flow rate of the remaining sewage pumping stations according to the drainage path and operation mode of each sewage pumping station; A lift pump operation status control module is used to monitor the liquid level changes of each sewage pump station in real time when the sewage pump station is in a water storage-drainage mode, and control the operation status of the corresponding lift pump according to the liquid level changes of each sewage pump station, and the corresponding maximum allowable water storage level and the minimum allowable discharge level; The dynamic adjustment module is used to adjust the maximum allowable water storage level and the minimum allowable discharge level of the corresponding sewage pumping station according to the overflow of the front-end sewage pipe and the change of the pumping flow during the water storage-drainage mode of each sewage pumping station, and adjust the sudden change point of the discharge water growth and the number of booster pumps to be opened according to the upstream drainage rules of each sewage pumping station and the actual maximum allowable flow.

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