A flocculant dosing flushing and anti-blocking system
By designing a flocculant dosing and flushing anti-blocking system in sewage treatment, the problem of flocculant condensation and blockage in the screw pump is solved, and the stable dosing of flocculant and the normal operation of the screw pump is achieved.
Patent Information
- Application Number
- CN202421007794.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-05-10
AI Technical Summary
During sewage treatment, flocculant is prone to condense in the screw pump, resulting in blockage and affecting the stable addition of flocculant.
A flocculant dosing and flushing anti-blocking system is designed. By setting up a flushing pipe and a drug outlet pipe at the inlet of the screw pump, and valves are provided separately. When the flocculant is temporarily put into use, the valve of the drug outlet pipe is closed and the valve of the flushing pipe is opened, so that the flushing water enters the screw pump and takes away the remaining flocculant.
It effectively avoids the flocculation liquid condensation in the screw pump, prevents blockage, improves the stable injection of flocculant, and avoids problems such as difficulty in starting the screw pump and overload burning.
Smart Images
Figure CN222715170U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sewage treatment, and specifically relates to a flocculant dosing flushing and anti-blocking system. Background Art
[0002] Sewage treatment plants need to use flocculants in the process of sewage treatment. For example, flocculants are added to sedimentation tanks to promote the sedimentation of solid particles, thereby improving the effect of sedimentation and water purification. For example, flocculants are added before the water-containing sludge enters the sludge dewatering machine to promote sludge flocculation, thereby improving the sludge dewatering efficiency.
[0003] In order to increase the mixing speed of flocculants and sewage, the sewage treatment plant first mixes the flocculants and water in the dosing box to obtain the flocculant liquid, and then transports it to each dosing point through a pipeline. Since the flocculant liquid has a certain viscosity, it is generally transported by a screw pump with pressure boosting; but since there is less space between the stator of the screw pump and its inner screw shaft, and the screw pump is relatively slender as a whole, during the intermittent dosing of the flocculant liquid, the flocculant liquid in the screw pump is easy to accumulate and condense into a jelly-like colloid when the screw pump is stopped, which will not only make the screw pump difficult to start or even burn due to overload, but also easily cause the pipeline to rupture due to excessive pressure. Therefore, it is necessary to design a flushable flocculant dosing system to avoid the situation where the flocculant liquid condenses in the screw pump and affects the flocculant dosing, and to improve the stability of flocculant dosing. Summary of the invention
[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a flocculant dosing and flushing anti-blocking system to solve the technical problem that the flocculant liquid is easily coagulated and blocked in the screw pump, and to achieve the effect of stable flocculant addition.
[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0006] A flocculant dosing, flushing and anti-blocking system comprises a dosing box and a screw pump. A drug outlet pipe is connected between the outlet of the dosing box and the inlet of the screw pump. The outlet of the screw pump is connected to a drug delivery pipe for conveying flocculation liquid to a dosing point. The inlet of the screw pump is also connected to a flushing pipe for inputting flushing water into the screw pump. Valves are respectively provided on the flushing pipe and the drug outlet pipe near the inlet of the screw pump.
[0007] Furthermore, a drain pipe is connected to the outlet of the screw pump on the medicine delivery pipe to discharge the flushing water carrying residual flocculant, and valves are respectively provided on the drain pipe and the medicine delivery pipe near the connection between the drain pipe and the medicine delivery pipe.
[0008] Furthermore, the valves on the medicine outlet pipe and the flushing pipe are the first electrically controlled valve and the second electrically controlled valve respectively, and the valves on the medicine delivery pipe and the drainage pipe are the third electrically controlled valve and the fourth electrically controlled valve respectively; the flocculant dosing, flushing and anti-blocking system also includes a controller, a timer and a start-stop switch, and the controller is electrically connected to the drive motor of the screw pump, the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, the fourth electrically controlled valve, the timer and the start-stop switch respectively.
[0009] Furthermore, a viscosity sensor is provided on the medicine delivery tube near the outlet of the screw pump, and the viscosity sensor is electrically connected to the controller.
[0010] Furthermore, the flocculant dosing, flushing and anti-blocking system also includes a power regulator, and the controller is electrically connected to the driving motor of the screw pump through the power regulator.
[0011] Furthermore, the end of the drain pipe is communicated with the inlet of the medicine adding tank.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] 1. The flocculant dosing and flushing anti-blocking system of the utility model is provided with a flushing pipe and a drug outlet pipe connected in parallel at the inlet of the screw pump, and valves are respectively provided on the flushing pipe and the drug outlet pipe; when the addition of flocculant is suspended, the valve on the drug outlet pipe is closed and the valve on the flushing pipe is opened, so that the flushing water in the flushing pipe enters the screw pump to take away the residual flocculant in the screw pump, thereby avoiding the flocculant in the screw pump from condensing into a colloid during shutdown, which can effectively solve the problem that the flocculant is easy to coagulate and clog in the screw pump, and is beneficial to improving the stability of the added flocculant.
[0014] 2. The flocculant dosing, flushing and anti-blocking system of the utility model is connected to a drain pipe on the drug delivery pipe, and valves are respectively provided on the drain pipe and the drug delivery pipe. When the addition of flocculation liquid is suspended and flushing water is introduced into the screw pump through the flushing pipe for flushing, the valve can be switched so that only the drain pipe is connected to the outlet of the screw pump, so that the flushing water carrying the flocculation liquid is discharged through the drain pipe, so as to avoid affecting the treatment process of the addition point, which is beneficial to improving the practicality of the flocculant dosing, flushing and anti-blocking system. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the pipeline structure of the flocculant dosing, flushing and anti-blocking system described in the embodiment;
[0016] Figure 2 This is a control wiring diagram of the flocculant dosing, flushing and anti-blocking system described in the embodiment;
[0017] Among them, there are a medicine adding box 1, a screw pump 2, a medicine outlet pipe 3, a medicine delivery pipe 4, a flushing pipe 5, a drainage pipe 6, a first electric-controlled valve 7, a second electric-controlled valve 8, a third electric-controlled valve 9, a fourth electric-controlled valve 10, a driving motor 11, and a viscosity sensor 12. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.
[0019] Example:
[0020] See also Figure 1 A flocculant dosing, flushing and anti-blocking system comprises a dosing box 1 and a screw pump 2. A drug outlet pipe 3 is connected between the outlet of the dosing box 1 and the inlet of the screw pump 2. The outlet of the screw pump 2 is connected with a drug delivery pipe 4 for conveying flocculation liquid to the dosing point. The inlet of the screw pump 2 is also connected with a flushing pipe 5 for inputting flushing water into the screw pump 2. Valves are respectively provided on the flushing pipe 5 and the drug outlet pipe 3 near the inlet of the screw pump 2. In this embodiment, in order to meet the demand for dosing flocculation liquid at multiple dosing points, three screw pumps 2 are provided and are respectively connected with drug delivery pipes 4 between each dosing point. The drug outlet pipe 3 and the flushing pipe 5 are respectively connected with the inlets of the three screw pumps 2. During implementation, the end of the drain pipe 6 can also be connected with the inlet of the dosing box 1 to realize the recovery of flocculation liquid and reduce the amount of water added to the dosing box 1 to prepare the flocculation liquid, thereby saving water resources.
[0021] In the flocculant dosing and flushing anti-blocking system of the utility model, a flushing pipe 5 and a medicine outlet pipe 3 are arranged in parallel at the inlet of the screw pump 2, and valves are arranged on the flushing pipe 5 and the medicine outlet pipe 3 respectively; in the process of intermittently adding flocculation liquid, when adding flocculation liquid, the screw pump 2 is started, the valve on the medicine outlet pipe 3 is opened, and the valve on the flushing pipe 5 is closed, so that the flocculation liquid in the dosing box 1 passes through the medicine outlet pipe 3, the screw pump 2 and the medicine delivery pipe 4 in sequence to reach the dosing point; when the addition of flocculation liquid is suspended, the valve on the medicine outlet pipe 3 is closed and the valve on the flushing pipe 5 is opened. The valve on the flushing pipe 5 allows the flushing water in the flushing pipe 5 to enter the screw pump 2 and take away the residual flocculant in the screw pump 2, avoiding the problem of difficulty in starting the screw pump 2, overload burning and pipeline rupture caused by the flocculant in the screw pump 2 coagulating into a colloid during the shutdown period. The flocculant dosing and flushing anti-blocking system are adopted to alternately perform flocculant addition and screw pump 2 flushing, which can effectively solve the problem of flocculant liquid easily coagulating and clogging in the screw pump 2, and is beneficial to improving the stability of the added flocculant.
[0022] See also Figure 1, the outlet of the medicine delivery pipe 4 near the screw pump 2 is connected with a drain pipe 6 for discharging the flushing water carrying the residual flocculant, and valves are respectively provided at the connecting parts of the drain pipe 6 and the medicine delivery pipe 4 near the drain pipe 6 and the medicine delivery pipe 4; in this way, when the addition of flocculant is suspended and flushing water is introduced into the screw pump 2 through the flushing pipe 5 for flushing, the valve on the medicine delivery pipe 4 is closed and the valve on the drain pipe 6 is opened, so that the flushing water carrying the flocculant is discharged through the drain pipe 6 to avoid affecting the treatment process of the addition point, especially when the addition point is located on the sludge pipe connected to the inlet of the sludge dewatering machine, the flushing water entering therein will cause the water content of the sludge to increase, thereby affecting the dehydration effect of the sludge dewatering machine; when adding flocculant, the valve on the drain pipe 6 is closed and the valve on the medicine delivery pipe 4 is opened, so that the flocculant reaches the addition point normally.
[0023] See also Figure 1 and 2 , the valves on the medicine outlet pipe 3 and the flushing pipe 5 are the first electric control valve 7 and the second electric control valve 8 respectively, and the valves on the medicine delivery pipe 4 and the drain pipe 6 are the third electric control valve 9 and the fourth electric control valve 10 respectively; in order to automatically intermittently add the flocculation liquid, and to automatically alternately add the flocculation liquid and flush the screw pump 2, the utility model also adds an automatic control system, which includes a controller, a timer and a start-stop switch, and the controller is electrically connected to the drive motor 11 of the screw pump 2, the first electric control valve 7, the second electric control valve 8, the third electric control valve 9, the fourth electric control valve 10, the timer and the start-stop switch respectively;
[0024] In this way, the dosing stop time node, flushing stop time node and circulation time node can be preset through the timer. After pressing the start-stop switch, the controller starts the drive motor 11 of the screw pump 2 and controls the first electric control valve 7 to open, the second electric control valve 8 to close, the third electric control valve 9 to open, and the fourth electric control valve 10 to close, so as to add the flocculant, and at the same time controls the timer to start timing; when the dosing stop time node is reached, the controller controls the drive motor 11 of the screw pump 2 to stop and controls the first electric control valve 7 to close, the second electric control valve 8 to open, the third electric control valve 9 to close, and the fourth electric control valve 10 to open, so as to flush the screw pump 2; when the flushing stop time node is reached, the controller controls the second electric control valve 8 and the fourth electric control valve 10 to close; when the circulation time node is reached, the controller starts the drive motor 11 of the screw pump 2 again and opens the first electric control valve 7 and the third electric control valve 9, and at the same time controls the timer to start a new round of timing.
[0025] See also Figure 1 and 2In order to ensure the flushing effect of the screw pump 2 while saving flushing water, it is necessary to accurately set the flushing stop time node. For this purpose, the automatic control system also includes a viscosity sensor 12 arranged on the medicine delivery pipe 4 near the outlet of the screw pump 2, and the viscosity sensor 12 is electrically connected to the controller; in this way, the standard viscosity value can be preset in the controller. During the flushing process of the screw pump 2, the controller obtains the real-time viscosity value of the liquid at the outlet of the screw pump 2 in real time through the viscosity sensor 12. When the flushing stop time node is about to be reached, but the real-time viscosity value is higher than the standard viscosity value, that is, the flushing effect is not up to standard, and there may be more flocculant liquid remaining in the screw pump 2, the controller will delay the flushing stop time node preset in the timer for a period of time. Before the flushing stop time node is reached, the real-time viscosity value is lower than the standard viscosity value, that is, the flushing effect is up to standard, and there is less flocculant liquid remaining in the screw pump 2 and it will not coagulate, the controller will advance the flushing stop time node preset in the timer for a period of time, thereby ending the flushing in advance.
[0026] See also Figure 1 and 2 In order to further improve the flushing effect, the automatic control system also includes a power regulator, and the controller is electrically connected to the drive motor 11 of the screw pump 2 through the power regulator; in this way, when flushing the screw pump 2, the controller can control the screw pump 2 to run at a low speed through the power regulator, so as to more smoothly flush the flocculation liquid or coagulated colloid out of the screw pump 2. When adding the flocculation liquid, the controller controls the screw pump 2 to run at a high speed through the power regulator to ensure that the flocculation liquid is smoothly transported to each addition point.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the utility model without departing from the purpose and scope of the technical solution of the utility model should be included in the scope of the claims of the utility model.
Claims
1. A flocculant dosing flushing and anti-blocking system, characterized by: It includes a dosing box and a screw pump. The outlet of the dosing box is connected to the inlet of the screw pump by a drug outlet pipe. The outlet of the screw pump is connected to a drug delivery pipe for conveying flocculant liquid to the dosing point. The inlet of the screw pump is also connected to a flushing pipe for inputting flushing water to the screw pump. Valves are respectively provided on the flushing pipe and the drug outlet pipe near the inlet of the screw pump.
2. According to claim 1, a flocculant dosing flushing and anti-blocking system is characterized by: The outlet of the medicine delivery pipe near the screw pump is connected with a drain pipe for discharging the flushing water carrying the residual flocculant liquid. Valves are respectively arranged on the drain pipe and the medicine delivery pipe near the connection between the drain pipe and the medicine delivery pipe.
3. A flocculant dosing flushing and anti-blocking system according to claim 2, characterized in that: The valves on the medicine outlet pipe and the flushing pipe are the first electrically controlled valve and the second electrically controlled valve respectively, and the valves on the medicine delivery pipe and the drainage pipe are the third electrically controlled valve and the fourth electrically controlled valve respectively; the flocculant dosing, flushing and anti-blocking system also includes a controller, a timer and a start-stop switch, and the controller is electrically connected to the drive motor of the screw pump, the first electrically controlled valve, the second electrically controlled valve, the third electrically controlled valve, the fourth electrically controlled valve, the timer and the start-stop switch respectively.
4. A flocculant dosing flushing and anti-blocking system according to claim 3, characterized in that: A viscosity sensor is provided on the medicine delivery pipe near the outlet of the screw pump, and the viscosity sensor is electrically connected to the controller.
5. According to claim 3, a flocculant dosing flushing and anti-blocking system is characterized by: The flocculant dosing, flushing and anti-blocking system also includes a power regulator, and the controller is electrically connected to the driving motor of the screw pump through the power regulator.
6. A flocculant dosing flushing and anti-blocking system according to claim 1, characterized in that: The end of the drain pipe is connected to the inlet of the medicine adding box.