Backwashing device of raw water diversion pipeline

Abstract

The utility model relates to a backwashing device of a raw water diversion pipeline, which belongs to the field of water treatment equipment and comprises a water collecting well, a backwashing main pipe component and a sediment collecting and discharging component, the backwashing main pipe assembly comprises a first raw water diversion pipe, a washing main pipe, a plurality of washing branch pipes and a second raw water diversion pipe, the first raw water diversion pipe and the second raw water diversion pipe are communicated through a water collecting well, the washing main pipe is arranged on one side of the first raw water diversion pipe in parallel, and the water inlet ends of the washing branch pipes are communicated with the washing main pipe; a rotatable flushing nozzle is mounted at the water outlet end; the sediment collecting and discharging assembly comprises a sediment trap, an ultrasonic mud level meter, a sediment discharging pipe and a pneumatic sediment discharging valve, and the sediment trap is arranged at the bottom of the water collecting well and communicates with the sediment discharging pipe through the pneumatic sediment discharging valve; the backwashing device of the raw water diversion pipeline has the characteristics of non-stop production dredging, accurate and efficient washing, intelligent linkage control, prolonged service life of the pipeline and low-cost transformation.

Description

TECHNICAL FIELD

[0001] The utility model relates to a backwashing device of raw water diversion pipeline belongs to water treatment equipment field. BACKGROUND

[0002] Riverbed water taking as a common surface water utilization mode is widely used in the field of waterworks. At present, most of the water plants in China adopt the standardized water taking mode of "water taking warehouse + water diversion pipe + water collecting well", that is, a water taking warehouse is arranged in the riverbed to preliminarily filter raw water, then the raw water is transported to the water taking pump house water collecting well on the riverbank through the water diversion pipe, and finally the raw water is lifted to the water purification plant by the booster pump for subsequent treatment. This technology has become the mainstream scheme of riverbed water taking at the present stage due to its simple structure and convenient construction, however, due to the complex river hydrological conditions, especially in the water area with high sediment content, this mode exposes many technical bottlenecks in actual operation, which seriously affects the safety and economy of the water supply system.

[0003] The core process of the existing water taking system includes water taking warehouse interception, water diversion and transportation, and sand setting and pressurization, specifically, the water taking warehouse pre-buried in the riverbed preliminarily filters large floating objects through the top grid, and the bottom inclined structure is used to reduce sediment deposition; the raw water is transported to the water taking pump house water collecting well by the water diversion pipe (usually steel pipe or prestressed concrete pipe) through gravity or low pressure; a sand setting area is arranged in the water collecting well, and after part of the sand is settled, the raw water is transported to the water purification plant through the high pressure pipeline by the booster pump.

[0004] Although this technology has high maturity, it still faces the following key problems in high-sediment river operation: first, the risk of sediment accumulation and blockage of the water diversion pipe, since the water diversion pipe is always at the bottom of the riverbed, the water flow rate decreases, causing continuous sediment deposition in the pipe, when the accumulation amount exceeds the design threshold, the water taking flow rate is sharply reduced, even completely blocked, and in extreme cases, the water plant may be out of raw water supply; second, the dredging relies on manual operation, the existing system adopts a passive sand removal mode of "water diversion pipe end + sand setting well", which needs to open the sand setting well gate to discharge the accumulated sand regularly, the manual dredging efficiency is low, and the high frequency dredging greatly increases the operation and maintenance cost; third, the pump set wears out and the energy efficiency deteriorates, the fine particle sand that cannot be effectively removed enters the booster pump with the water flow, causing the key components such as impeller and sealing ring to wear out quickly, the measured data shows that when the sediment content exceeds 1 kg / m 3 , the efficiency of the pump set decreases by 8%-12% per year, the maintenance cycle is shortened to 1 / 3 of the regular working condition, at the same time, the pipe blockage forces the pump set to run at overload for a long time to maintain the water supply pressure, causing the power consumption per ton of water to increase by 15%-20%, which significantly increases the operation cost of the water plant. In addition, the sand setting capacity of the existing sand setting well is insufficient, and the volume and settling time are not fully considered in the design of the sand concentration fluctuation, for example, when the sediment content increases by more than 10 times during the flood season, the settling efficiency is insufficient, and a large amount of sand directly enters the subsequent process.

[0005] Therefore, there is an urgent need in this field to solve the technical problems of how to avoid siltation and blockage in water pipes, reduce dredging costs, reduce the impact of silt on pump units, and improve the reliability and economy of water supply systems. Summary of the Invention

[0006] In view of this, this utility model addresses the problems in existing riverbed water intake systems, such as the need for manual dredging of water intake pipes due to siltation, the need to stop pumps and production during dredging operations leading to water supply interruptions, and the wear and tear on equipment and reduced water supply reliability caused by silt entering the pump set. It proposes a backwashing device for raw water intake pipelines to solve the following core problems:

[0007] 1. Resolve the contradiction between dependence on manual dredging and production stoppage: Through the linkage system of flushing pipe and sand discharge valve built into the device, the separation and discharge of silt can be completed simultaneously during the raw water transportation process, completely avoiding the pump stoppage and water cut-off operations required by traditional manual dredging, and ensuring the continuity of water supply and the stability of water plant production;

[0008] 2. Eliminate the risk of water pipe blockage: Based on real-time monitoring data of pipeline pressure and flow, dynamically adjust the frequency and intensity of sand removal to ensure that the concentration of silt in the water pipe is always below the critical value of siltation, and avoid sudden drop in water intake or supply interruption due to blockage.

[0009] 3. Blocking the wear path of the pump set: By efficiently intercepting fine particles of mud and sand (particle size > 50μm) (removal rate ≥ 90%), the device significantly reduces the mud and sand load entering the booster pump, extends the service life of core components such as pump impeller and seals (estimated service life increased by 2-3 times), and reduces equipment maintenance costs.

[0010] 4. Enhance the system's anti-interference capability: In response to instantaneous fluctuations in river sediment content (such as a surge in sediment during the flood season), the system responds quickly through an adaptive sediment discharge algorithm, ensuring that stable water intake and water quality can be maintained even under extreme conditions, thus significantly improving the environmental adaptability and operational reliability of the water supply system.

[0011] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0012] A backwashing device for a raw water intake pipeline includes a water collection well and a backwashing main pipe assembly and a sediment collection and discharge assembly installed on the water collection well;

[0013] The backwash main assembly includes a first raw water inlet pipe, a main flushing pipe, multiple flushing branch pipes, and a second raw water inlet pipe. The first and second raw water inlet pipes are connected through a collection well. The main flushing pipe is arranged parallel to one side of the first raw water inlet pipe and is connected to the second raw water inlet pipe through a tee connector. The inlet ends of the multiple flushing branch pipes are connected to the main flushing pipe, and the outlet ends are connected to the first raw water inlet pipe and are equipped with rotatable flushing nozzles.

[0014] The sediment collection and discharge assembly includes a sedimentation well, an ultrasonic sediment level gauge, a sediment discharge pipe, and a pneumatic sediment discharge valve. The sedimentation well is located at the bottom of the water collection well, and the bottom of the sedimentation well is a "V"-shaped sediment collection trough. The bottom of the sediment collection trough is connected to the sediment discharge pipe through the pneumatic sediment discharge valve. The ultrasonic sediment level gauge is located inside the sediment collection trough and is linked to the signal of the pneumatic sediment discharge valve.

[0015] Based on the above technical solution, the present invention can be further improved as follows.

[0016] Furthermore, it also includes an intelligent control system, which includes a control cabinet, a high-pressure electric valve installed between the flushing main pipe and the tee joint, and differential pressure sensors installed at the inlet and outlet of the first raw water inlet pipe, respectively. The high-pressure electric valve and the differential pressure sensors are electrically connected to the control cabinet.

[0017] Furthermore, the diameter of the first raw water inlet pipe and / or the second raw water inlet pipe is DN800-DN1200, the material is wear-resistant composite steel pipe, and the inner wall is sprayed with tungsten carbide coating with a thickness of ≥2mm;

[0018] Furthermore, the main flushing pipe is made of 316L stainless steel and has a diameter of DN200.

[0019] Furthermore, the flushing branch pipes are arranged axially along the first raw water inlet pipe at intervals of 3-5m.

[0020] Furthermore, the rotatable flushing nozzle rotates at a speed of 1200-1500 rpm, with a spray angle of 30°-45°, forming a spiral water curtain with a flow rate ≥5m / s.

[0021] Furthermore, the diameter of the sand discharge pipe is DN300.

[0022] The beneficial effects of this utility model are:

[0023] The backwashing device for the raw water intake pipeline of this utility model has the characteristics of non-stop sludge removal, precise and efficient flushing, intelligent linkage control, extended pipeline life and low-cost transformation.

[0024] Non-stop dredging: By diverting part of the raw water for backwashing, there is no need to stop the pump or interrupt the water supply. The water supply guarantee rate during the dredging operation is ≥99.9%, which completely solves the problem of water supply interruption caused by the need to stop the pump and production during traditional manual dredging.

[0025] Precise and efficient flushing: The rotating nozzle covers a 360° area at the bottom of the pipe, achieving a flushing intensity of 8-10 L / (s·m) per unit area. 2 Compared with traditional fixed nozzles, it improves the dredging efficiency by 4-5 times, effectively avoids the risk of water pipe blockage, and ensures that the silt concentration in the water pipe is always below the critical value for siltation.

[0026] Intelligent linkage control: Based on the dual parameter feedback of differential pressure and mud level, it realizes fully automatic adjustment of dredging cycle, reduces the frequency of manual intervention by 90%, and significantly reduces operation and maintenance costs;

[0027] Extending pipeline life: Regular backflushing avoids localized corrosion caused by long-term sand accumulation at the bottom of the pipe, extending the pipeline's service life from 15 years to more than 25 years. At the same time, the efficient interception of fine particles of silt significantly reduces the silt load entering the booster pump, extending the service life of the pump's core components and reducing equipment maintenance costs.

[0028] Low-cost retrofit: The device can be directly installed on the outer wall of the existing water inlet pipe. The retrofit period is ≤3 days, and the overall cost is only 1 / 5 of the cost of building a new sedimentation tank. It has significant economic and social benefits and effectively improves the reliability and economy of the water supply system. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. Water collection well; 2. First raw water inlet pipe; 3. Flushing main pipe; 4. Flushing branch pipe; 5. Second raw water inlet pipe; 6. T-joint; 7. Rotatable flushing nozzle; 8. Sedimentation well; 9. Ultrasonic mud level gauge; 10. Sand discharge pipe; 11. Pneumatic sand discharge valve; 12. Control cabinet; 13. High-pressure electric valve; 14. Differential pressure sensor. Detailed Implementation

[0032] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0033] like Figure 1 As shown, the backwashing device for the raw water intake pipeline includes a water collection well 1 and a backwashing main pipe 3 assembly and a sediment collection and discharge assembly installed on the water collection well 1.

[0034] The backwash main pipe 3 assembly includes a first raw water inlet pipe 2, a flushing main pipe 3, multiple flushing branch pipes 4, and a second raw water inlet pipe 5. The first raw water inlet pipe 2 and the second raw water inlet pipe 5 are connected through a water collection well 1. The flushing main pipe 3 is arranged parallel to one side of the first raw water inlet pipe 2 and is connected to the second raw water inlet pipe 5 through a three-way connector 6. The inlet ends of the multiple flushing branch pipes 4 are respectively connected to the flushing main pipe 3, and the outlet ends are respectively connected to the first raw water inlet pipe 2 and are equipped with rotatable flushing nozzles 7.

[0035] The sediment collection and discharge assembly includes a sedimentation well 8, an ultrasonic sediment level gauge 9, a sediment discharge pipe 10, and a pneumatic sediment discharge valve 11. The sedimentation well 8 is located at the bottom of the water collection well 1. The bottom of the sedimentation well 8 is a "V"-shaped sediment collection trough. The bottom of the sediment collection trough is connected to the sediment discharge pipe 10 through the pneumatic sediment discharge valve 11. The ultrasonic sediment level gauge 9 is located in the sediment collection trough and is linked to the pneumatic sediment discharge valve 11.

[0036] When the device is working, raw water flows from the riverbed intake chamber through the first raw water inlet pipe 2 to the collection well 1. The sediment is deposited at the bottom of the pipe with the water flow. The raw water after sedimentation flows out through the second raw water inlet pipe 5. A portion of the raw water (about 10%-15% of the total flow) flows through the three-way connector 6 and into the diversion main pipe 3. It is then transported through the flushing branch pipe 4 to the rotatable nozzle to form a spiral water curtain to flush the sediment at the bottom of the pipe. The flushed sediment enters the sedimentation well 8 with the water flow. When the ultrasonic mud level gauge 9 detects that the sedimentation volume has reached the set height, it automatically opens the pneumatic sand discharge valve 11 and discharges the sediment to the external sand discharge channel through the sand discharge pipe 10.

[0037] In another embodiment of this utility model, an intelligent control system is also included. The intelligent control system includes a control cabinet 12, a high-pressure electric valve 13 disposed between the flushing main pipe 3 and the tee joint 6, and differential pressure sensors 14 disposed at the inlet and outlet of the first raw water inlet pipe 2, respectively. The high-pressure electric valve 13 and the differential pressure sensor 14 are electrically connected to the control cabinet 12. The control cabinet 12 integrates a PLC controller, receives differential pressure and mud level signals, automatically triggers the backwashing program and adjusts the valve opening. The high-pressure electric valve 13 is used to adjust the flushing water pressure (working pressure 0.8-1.2MPa), and the differential pressure sensor 14 monitors the pressure difference (ΔP) before and after the pipeline in real time.

[0038] With the addition of the above structure, automatic control of backwashing can be achieved. The differential pressure sensor 14 continuously monitors ΔP. ​​When ΔP exceeds the set threshold (e.g., 0.15MPa), it is determined that the siltation in the pipe is serious and the backwashing procedure is triggered: the control cabinet 12 opens the high-pressure electric valve 13, the second raw water inlet pipe 5 is connected to the flushing main pipe 3 to achieve diversion. After the backwashing is completed, the control cabinet 12 closes the high-pressure electric valve 13, and the first raw water inlet pipe 2 resumes full flow operation.

[0039] In addition, the system in control cabinet 12 can record data such as the duration of backwashing and the amount of sand discharged during the current backwashing through preset programs and circuits, and optimize the timing of the next backwashing trigger through machine learning algorithms.

[0040] In another embodiment of this utility model, the diameter of the first raw water inlet pipe 2 and / or the second raw water inlet pipe 5 is DN800-DN1200, the material is wear-resistant composite steel pipe, and the inner wall is sprayed with tungsten carbide coating with a thickness ≥2mm.

[0041] In another embodiment of this utility model, the flushing main pipe 3 is made of stainless steel 316L and has a diameter of DN200.

[0042] In another embodiment of this utility model, the flushing branch pipes 4 are arranged axially along the first raw water inlet pipe 2 at intervals of 3-5m.

[0043] In another embodiment of this utility model, the rotatable flushing nozzle 7 rotates at a speed of 1200-1500 rpm, with a spray angle of 30°-45°, forming a spiral water curtain with a flow rate ≥5m / s.

[0044] In another embodiment of this utility model, the diameter of the sand discharge pipe 10 is DN300.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backwash device for raw water intake conduit, characterized by, The application relates to a water collecting well and a backwashing main pipe assembly and a silt collecting and discharging assembly arranged on the water collecting well. The backwashing main pipe assembly comprises a first raw water guide pipe, a flushing main pipe, a plurality of flushing branch pipes and a second raw water guide pipe, the first raw water guide pipe and the second raw water guide pipe are communicated through the water collecting well, the flushing main pipe is arranged on one side of the first raw water guide pipe in parallel and communicated with the second raw water guide pipe through a tee joint, the water inlet ends of the plurality of flushing branch pipes are respectively communicated with the flushing main pipe, the water outlet ends are respectively communicated with the first raw water guide pipe and are provided with rotatable flushing nozzles. The silt collecting and discharging assembly comprises a sand setting well, an ultrasonic silt level meter, a silt discharging pipe and a pneumatic silt discharging valve, the sand setting well is arranged at the bottom of the water collecting well, the bottom end of the sand setting well is a V-shaped sand collecting groove, the bottom of the sand collecting groove is communicated with the silt discharging pipe through the pneumatic silt discharging valve, and the ultrasonic silt level meter is arranged in the sand collecting groove and is signal-linked with the pneumatic silt discharging valve.

2. The backwashing device for raw water intake conduit according to claim 1, characterized in that, The application further comprises an intelligent control system, the intelligent control system comprises a control cabinet, a high-pressure electric valve arranged between the flushing main pipe and the tee joint, and differential pressure sensors arranged at the water inlet and the water outlet of the first raw water guide pipe respectively, and the high-pressure electric valve and the differential pressure sensors are electrically connected with the control cabinet.

3. The backwashing device of a raw water intake conduit according to claim 1 or 2, characterized in that, The pipe diameter of the first raw water guide pipe and / or the second raw water guide pipe is DN800-DN1200, the material is wear-resistant composite steel pipe, the inner wall is sprayed with tungsten carbide coating with a thickness of greater than or equal to 2mm.

4. The backwashing device for raw water intake conduit according to claim 1 or 2, characterized by The material of the flushing main pipe is stainless steel 316L, and the pipe diameter is DN200.

5. The backwashing device for raw water intake conduit according to claim 1 or 2, characterized by The flushing branch pipes are arranged along the first raw water guide pipe in an axial direction with a spacing of 3-5m.

6. The backwashing device for raw water intake conduit according to claim 1 or 2, characterized by The rotatable flushing nozzles rotate at a speed of 1200-1500rpm, the spray angle is 30-45 degrees, a spiral water curtain is formed, and the flow rate is greater than or equal to 5m / s.

7. The backwashing device for raw water intake conduit according to claim 1 or 2, characterized by The pipe diameter of the silt discharging pipe is DN300.

Images