Sewage pipe network multi-node collaborative dynamic flushing method based on liquid level difference driving

Abstract

The invention discloses a sewage pipe network multi-node collaborative dynamic flushing method based on liquid level difference driving, a sewage pipe network comprises a plurality of nodes and a plurality of pipelines, the two ends of each pipeline are connected with the nodes, and each node is provided with a liquid level sensor and a valve; the flushing method comprises the following steps: 1) selecting a pipeline to be flushed; 2) closing the valve at the node of the downstream end of the pipeline or reducing the opening degree of the valve at the node of the downstream end of the pipeline; 3) calculating the liquid level difference of the two nodes according to the measured values of the liquid level sensor at the node of the upstream end of the pipeline and the liquid level sensor at the node of the downstream end of the pipeline; and (4) when the liquid level difference is larger than or equal to the set threshold value, the valve at the node of the downstream end of the pipeline is opened. According to the flushing method, sediments in the pipeline can be effectively cleaned, the labor is reduced, the maintenance cost is reduced, and the subsequent sewage treatment efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment, and specifically to a multi-node coordinated dynamic flushing method for a sewage pipe network driven by liquid level difference. Background Art

[0002] Urban sewage pipe networks contain numerous nodes and multiple pipes connecting them. These nodes can be storage tanks, wells, and other locations. Sediment accumulates within these pipes over the course of their operation. This builds in thickness, causing pipe blockages. Furthermore, the sediment itself is harmful to the pipes if not removed over time. Therefore, regular cleaning of sediment within the pipes is essential.

[0003] Conventional pipe dredging uses mechanical hydraulics or manual downhole operations to remove pollutants deposited in the pipe network. Existing technologies suffer from high dredging costs, high downhole operation risks, reduced organic carbon sources after sediment is removed from the pipe network, low water quality entering the sewage treatment plant, and increased carbon source injection costs. Summary of the Invention

[0004] Purpose of the invention: This application aims to overcome the defects of the prior art and provide a multi-node coordinated dynamic flushing method for sewage pipe networks based on liquid level difference drive.

[0005] Technical solution: A method for flushing a sewage pipe network, wherein the sewage pipe network includes multiple nodes and multiple pipes, both ends of each pipe are connected to the node, and each node is equipped with a liquid level sensor and a valve;

[0006] The flushing method comprises the following steps:

[0007] 1) Select the pipe that needs to be flushed;

[0008] 2) closing the valve at the node at the downstream end of the pipeline or reducing the opening of the valve at the node at the downstream end of the pipeline;

[0009] 3) calculating the liquid level difference between the two nodes based on the measurement values ​​of the liquid level sensor at the node at the upstream end of the pipeline and the liquid level sensor at the node at the downstream end of the pipeline;

[0010] 4) When the liquid level difference is greater than or equal to the set threshold, open the valve at the node at the downstream end of the pipeline.

[0011] Furthermore, to calculate the liquid level difference between the two nodes, it is necessary to convert the measurement value of the first liquid level sensor into the distance from the liquid level at the upstream node to the sea level, called the first distance; and convert the measurement value of the second liquid level sensor into the distance from the liquid level at the downstream node to the sea level, called the second distance. The liquid level difference is the difference between the first distance and the second distance.

[0012] Furthermore, the two ends of the pipeline are an upstream end and a downstream end respectively, and both the upstream end and the downstream end have nodes.

[0013] Furthermore, the valve is a pneumatic valve.

[0014] Furthermore, the valve is a butterfly valve or a gate valve.

[0015] Furthermore, the node is a pumping station, a well or a storage tank.

[0016] Furthermore, the well is an inspection well, a junction well or a diversion well.

[0017] Furthermore, a control unit and a wireless communication unit are installed at each node, the liquid level sensor is connected to the control unit, and the valve is controlled by the control unit.

[0018] Furthermore, the liquid level sensor is an ultrasonic liquid level sensor or a pressure liquid level sensor.

[0019] Furthermore, a sediment thickness detection device is installed in each pipeline. When the sediment thickness in a pipeline is greater than the sediment thickness threshold of the pipeline, the pipeline is flushed.

[0020] Furthermore, a corresponding sediment thickness threshold is set according to the shape and size of each pipeline.

[0021] That is, the sediment thickness thresholds for different pipelines may be different. Therefore, whether the sediment is too thick in each pipeline is determined by the conditions of the pipeline itself. By setting a specific threshold for the sediment thickness of each pipeline, it is more targeted.

[0022] The present application also discloses a method for flushing a sewage pipe network, wherein the sewage pipe network includes a regulating reservoir and a plurality of inspection wells, wherein a pipe is connected between each inspection well and the regulating reservoir, wherein one end of the pipe connected to the regulating reservoir is the upstream end of the pipe, and one end of the pipe connected to the inspection well is the downstream end of the pipe, wherein a plurality of first electric valves for opening and closing the upstream end of the pipe are installed in the regulating reservoir, wherein the number of the first electric valves is equal to the number of the pipes and the two correspond one to one, wherein a second electric valve for opening and closing the downstream end of the pipe is installed in the inspection well, wherein a first liquid level sensor is installed at the regulating reservoir, and a second liquid level sensor is installed in each inspection well;

[0023] The flushing method includes a flushing operation, and the flushing operation includes the following steps:

[0024] 1) Close all second electric valves;

[0025] 2) Calculate the liquid level difference between the regulating reservoir and each inspection well using the measurement values ​​of the first liquid level sensor and the second liquid level sensor, when any of the liquid level differences is greater than or equal to a set threshold;

[0026] 3) One of the plurality of first electric valves at the regulating reservoir is set to a first opening, and the remaining first electric valves are set to a second opening, wherein the first opening is greater than the second opening.

[0027] Furthermore, to calculate the liquid level difference between the two nodes, it is necessary to convert the measurement value of the first liquid level sensor into the distance from the liquid level at the upstream node to the sea level, called the first distance; and convert the measurement value of the second liquid level sensor into the distance from the liquid level at the downstream node to the sea level, called the second distance. The liquid level difference is the difference between the first distance and the second distance.

[0028] Furthermore, in step 1), all first electric valves are opened, and the opening degree is greater than or equal to 50%.

[0029] Furthermore, the diversion well is also connected to an upstream pipe of the regulating reservoir, and each inspection well is also connected to a downstream pipe of the inspection well.

[0030] Furthermore, the number of the inspection wells is N, the cross section of the pipe is circular with a diameter of D, and the thickness of the sediment in the pipe is H;

[0031] The flushing method further includes a flushing cycle, wherein the flushing cycle includes sediment information acquisition and multiple flushing operations subsequent to the sediment information acquisition;

[0032] According to the sediment information, when the H / D ratio in each pipeline is less than or equal to the sediment threshold, N flushing operations constitute a flushing cycle, and in the flushing cycle, the first electric valve with the first opening degree is a different valve in each flushing operation.

[0033] Furthermore, according to the sediment information, when the number of pipes in which the H / D ratio in the pipes is greater than the sediment threshold is M, (N+M) flushing operations constitute a flushing cycle, and in this flushing cycle, the opening degree of the first electric valve in the pipes in which the H / D ratio in the pipes is greater than the sediment threshold is the first opening degree in two flushing operations; and the opening degree of the first electric valve in the remaining pipes is the first opening degree in one flushing operation.

[0034] Furthermore, according to the sediment information, when the number of pipes in which the H / D ratio in the pipeline is greater than the sediment threshold is M, (N+M) flushing operations constitute a flushing cycle, and in this flushing cycle, the opening degree of the first electric valve is the first opening degree in two flushing operations for the pipes in which the H / D ratio in the pipeline is greater than the sediment threshold, and the number of flushing operations between these two flushing operations is (N-1); for the remaining pipes, the opening degree of the first electric valve is the first opening degree in one flushing operation.

[0035] Furthermore, the number of the inspection wells is 2-5.

[0036] Furthermore, sediment information is obtained through manual inspection.

[0037] In other embodiments, the sediment information is obtained by a detection device installed in the pipeline for detecting sediment thickness, wherein the detection device is an ultrasonic detection device and / or a laser scanning device.

[0038] Furthermore, the flushing cycle is performed once every set time.

[0039] Furthermore, the set time is one week or one month.

[0040] Beneficial effect: The sediment treatment of the present application does not require manual long-term dredging operations underground, thereby reducing labor intensity and reducing pipeline maintenance costs.

[0041] It replaces highly polluting chemical dredging and high-energy consumption mechanical flushing, reduces solid waste emissions generated by pipeline dredging, and achieves green and low-carbon development.

[0042] The sediment in the pipe network is washed into the sewage treatment plant, which increases the COD concentration of the incoming water, thereby improving the efficiency of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the sewage pipe network in Example 2. DETAILED DESCRIPTION

[0044] Figure numerals: 1 regulating reservoir; 1.1 upstream pipe of regulating reservoir; 1.2 first liquid level sensor; 2 inspection well; 2.1 downstream pipe of inspection well; 2.2 second liquid level sensor; 3 pipeline; 3.1 first electric valve; 3.2 second electric valve.

[0045] Example 1

[0046] A multi-node coordinated dynamic flushing method for a sewage pipe network driven by liquid level difference, wherein the sewage pipe network includes multiple nodes and multiple pipes, each pipe is connected to a node at both ends, and a liquid level sensor and a valve are installed at each node;

[0047] The flushing method comprises the following steps:

[0048] 1) Select the pipe that needs to be flushed;

[0049] 2) closing the valve at the node at the downstream end of the pipeline or reducing the opening of the valve at the node at the downstream end of the pipeline;

[0050] 3) calculating the liquid level difference between the two nodes based on the measurement values ​​of the liquid level sensor at the node at the upstream end of the pipeline and the liquid level sensor at the node at the downstream end of the pipeline;

[0051] 4) When the liquid level difference is greater than or equal to the set threshold, open the valve at the node at the downstream end of the pipeline.

[0052] The two ends of the pipeline are respectively the upstream end and the downstream end, and both the upstream end and the downstream end have nodes. The valve is a pneumatic valve or an electric valve; the valve is a butterfly valve or a gate valve. The node is a pump station, a well or a storage tank; the well is an inspection well, a junction well or a diversion well. A control unit and a wireless communication unit are installed at each node, the liquid level sensor is connected to the control unit, and the valve is controlled by the control unit. The liquid level sensor is an ultrasonic liquid level sensor or a pressure liquid level sensor. A sediment thickness detection device, an ultrasonic detection device and / or a laser scanning device are installed in each pipeline. When the sediment thickness in a pipeline is greater than the sediment thickness threshold of this pipeline, the pipeline is flushed. A corresponding sediment thickness threshold is set for each pipeline shape and size. That is, the sediment thickness thresholds of different pipelines may be different.

[0053] The sewage treatment plant of this embodiment has multiple nodes, so when a pipeline needs to be flushed, the valve at the downstream end of the pipeline is closed, so that the liquid in the pipeline can accumulate, thereby the liquid level rises, and when the liquid level difference between the node at the upstream end of the pipeline and the node at the downstream end of the pipeline reaches the set threshold, the valve can be opened quickly, so that the water flow quickly flushes the pipeline, thereby flushing the sediment in the pipeline to the downstream. The pipe network flow rate can be increased from the conventional 0.1-0.8m / s to 1.2-1.5m / s (exceeding the critical starting flow rate of sediment), and the sediment flushing efficiency is improved by 50%-80%. And according to the sediment deposition situation of each pipeline (which can be detected by a detection device installed in the pipeline, and in some cases can also be obtained by manual inspection), the pipeline that needs to be flushed is dynamically flushed, thereby achieving efficient cleaning of sediments.

[0054] For example, in a more specific example, when the upstream node is a pump station, when the liquid level difference is less than the threshold, the control system determines that the current flow rate is insufficient to flush the sediment, increases the pumping power of the upstream pump station or starts the backup pump station. By closing the valve at the downstream node or reducing the opening of the valve at the downstream node, the downstream drainage speed can be slowed down, causing the water level in the upstream pipe network to gradually rise, forming a local "water storage area" until the liquid level difference reaches the threshold. When the liquid level difference reaches the threshold, the control system sends a command to the valve at the pipe network control node to quickly open the valve (opening time ≤ 10 seconds), using the upstream and downstream water level difference to form an instantaneous high-speed water flow (the flow rate can be increased by 30%-50%). The high-speed water flow carries the sediment at the bottom of the pipe network (such as silt and organic particles) toward the sewage treatment plant, achieving non-contact flushing.

[0055] Example 2

[0056] A multi-node coordinated dynamic flushing method for a sewage pipe network driven by liquid level difference, the sewage pipe network comprising a regulating reservoir 1 and a plurality of inspection wells 2, each inspection well 2 being connected to the regulating reservoir 1 by a pipe 3, the end of the pipe 3 connected to the regulating reservoir 1 being the upstream end of the pipe, and the end of the pipe 3 connected to the inspection well 2 being the downstream end of the pipe, the regulating reservoir 1 being installed with a plurality of first electric valves 3.1 for opening and closing the upstream end of the pipe, the number of the first electric valves 3.1 being equal to the number of the pipes 3 and corresponding one to one, the inspection wells 2 being installed with second electric valves 3.2 for opening and closing the downstream end of the pipe, the regulating reservoir 1 being installed with a first liquid level sensor 1.2, and each inspection well 2 being installed with a second liquid level sensor 2.2;

[0057] The flushing method includes a flushing operation, and the flushing operation includes the following steps:

[0058] 1) Close all second electric valves;

[0059] 2) Calculate the liquid level difference between the regulating reservoir and each inspection well using the measurement values ​​of the first liquid level sensor and the second liquid level sensor, when any of the liquid level differences is greater than or equal to a set threshold;

[0060] 3) One of the plurality of first electric valves at the regulating reservoir is set to a first opening, and the remaining first electric valves are set to a second opening, wherein the first opening is greater than the second opening.

[0061] Furthermore, in step 1), all first electric valves are opened, and the opening degree is greater than or equal to 50%.

[0062] Furthermore, the diversion well is also connected to an upstream pipe of the regulating reservoir, and each inspection well is also connected to a downstream pipe of the inspection well.

[0063] The number of the inspection wells is N, the cross section of the pipe is circular with a diameter of D, and the thickness of the sediment in the pipe is H;

[0064] The flushing method further includes a flushing cycle, wherein the flushing cycle includes sediment information acquisition and multiple flushing operations subsequent to the sediment information acquisition;

[0065] According to the sediment information, when the H / D ratio in each pipeline is less than or equal to the sediment threshold, N flushing operations constitute a flushing cycle, and in the flushing cycle, the first electric valve with the first opening degree is a different valve in each flushing operation.

[0066] According to the sediment information, when the number of pipes in which the H / D ratio in the pipeline is greater than the sediment threshold is M, (N+M) flushing operations constitute a flushing cycle, and in this flushing cycle, the opening degree of the first electric valve in the pipes in which the H / D ratio in the pipeline is greater than the sediment threshold is the first opening degree in two flushing operations, and the number of flushing operations between these two flushing operations is (N-1); for the remaining pipes, the opening degree of the first electric valve is the first opening degree in one flushing operation.

[0067] The sediment information is obtained through manual inspection or through a detection device installed in the pipeline for detecting sediment thickness, wherein the detection device is an ultrasonic detection device and / or a laser scanning device.

[0068] In the sewage pipe network of this embodiment, the regulating and storage tank is connected to multiple pipes, so that the sewage at the regulating and storage tank can be distributed to multiple pipes. Under normal circumstances, each time a flushing cycle is executed, each flushing operation of the flushing cycle is mainly used to flush one of the pipes. The opening of the first valve corresponding to this pipe is larger, so that more water can be distributed, thereby obtaining a better flushing effect. Each flushing cycle can flush each pipe. However, when the thickness of the sediment in one or more pipes exceeds the sediment threshold according to the detection results or the inspection results, the flushing cycle can increase the number of flushing operations by the corresponding number, so that the pipe with more sediment is flushed twice in this flushing cycle, thereby more targeted flushing of the pipe with more sediment.

[0069] Although the present invention has been illustrated and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A multi-node coordinated dynamic flushing method for sewage pipe network based on liquid level difference driving, characterized in that: The sewage pipe network includes multiple nodes and multiple pipes, both ends of each pipe are connected to the node, and each node is equipped with a liquid level sensor and a valve; The flushing method comprises the following steps: 1) Select the pipe that needs to be flushed; 2) closing the valve at the node at the downstream end of the pipeline or reducing the opening of the valve at the node at the downstream end of the pipeline; 3) calculating the liquid level difference between the two nodes based on the measurement values ​​of the liquid level sensor at the node at the upstream end of the pipeline and the liquid level sensor at the node at the downstream end of the pipeline; 4) When the liquid level difference is greater than or equal to the set threshold, open the valve at the node at the downstream end of the pipeline.

2. The method for multi-node coordinated dynamic flushing of sewage pipe network based on liquid level difference drive according to claim 1 is characterized in that: The valve is a pneumatic valve or an electric valve; the valve is a butterfly valve or a gate valve.

3. The method for multi-node coordinated dynamic flushing of sewage pipe network based on liquid level difference drive according to claim 1 is characterized in that: The node is a pumping station, a well or a storage tank; the well is an inspection well, a junction well or a diversion well.

4. The method for multi-node coordinated dynamic flushing of sewage pipe network based on liquid level difference drive according to claim 1 is characterized in that: A control unit and a wireless communication unit are installed at each node. The liquid level sensor is connected to the control unit, and the valve is controlled by the control unit.

5. The method for multi-node coordinated dynamic flushing of sewage pipe network based on liquid level difference drive according to claim 1 is characterized in that: The liquid level sensor is an ultrasonic liquid level sensor or a pressure liquid level sensor.

6. The method for multi-node coordinated dynamic flushing of sewage pipe network based on liquid level difference drive according to claim 1 is characterized in that: A sediment thickness detection device is installed in each pipeline. When the sediment thickness in a pipeline is greater than the sediment thickness threshold of this pipeline, the pipeline is flushed.

7. A multi-node coordinated dynamic flushing method for sewage pipe network based on liquid level difference driving, characterized in that: The sewage pipe network includes a regulating reservoir and multiple inspection wells, each inspection well and the regulating reservoir are connected to a pipe, the end of the pipe connected to the regulating reservoir is the upstream end of the pipe, and the end of the pipe connected to the inspection well is the downstream end of the pipe. The regulating reservoir is equipped with multiple first electric valves for opening and closing the upstream end of the pipe, and the number of the first electric valves is equal to the number of the pipes and the two correspond one to one. The inspection wells are equipped with second electric valves for opening and closing the downstream end of the pipe. A first liquid level sensor is installed at the regulating reservoir, and a second liquid level sensor is installed in each inspection well. The flushing method includes a flushing operation, and the flushing operation includes the following steps: 1) Close all second electric valves; 2) Calculate the liquid level difference between the regulating reservoir and each inspection well using the measurement values ​​of the first liquid level sensor and the second liquid level sensor, when any of the liquid level differences is greater than or equal to a set threshold; 3) One of the plurality of first electric valves at the regulating reservoir is set to a first opening, and the remaining first electric valves are set to a second opening, wherein the first opening is greater than the second opening.

8. The method for multi-node coordinated dynamic flushing of sewage pipe network based on liquid level difference drive according to claim 7 is characterized in that: The number of the inspection wells is N, the cross section of the pipe is circular with a diameter of D, and the thickness of the sediment in the pipe is H; The flushing method further includes a flushing cycle, wherein the flushing cycle includes sediment information acquisition and multiple flushing operations subsequent to the sediment information acquisition; According to the sediment information, when the H / D ratio in each pipeline is less than or equal to the sediment threshold, N flushing operations constitute a flushing cycle, and in the flushing cycle, the first electric valve with the first opening degree is a different valve in each flushing operation.

9. The method for multi-node coordinated dynamic flushing of sewage pipe network based on liquid level difference drive according to claim 8 is characterized in that: According to the sediment information, when the number of pipes in which the H / D ratio in the pipeline is greater than the sediment threshold is M, (N+M) flushing operations constitute a flushing cycle, and in this flushing cycle, the opening degree of the first electric valve is the first opening degree in two flushing operations for the pipes in which the H / D ratio in the pipeline is greater than the sediment threshold, and the number of flushing operations between these two flushing operations is (N-1); for the remaining pipes, the opening degree of the first electric valve is the first opening degree in one flushing operation.

10. The method for multi-node coordinated dynamic flushing of sewage pipe networks based on liquid level difference drive according to claim 8, characterized in that: The sediment information is obtained through manual inspection or through a detection device installed in the pipeline for detecting sediment thickness, wherein the detection device is an ultrasonic detection device and / or a laser scanning device.

Images