Flocculant variable-frequency adding system

Abstract

The utility model discloses a flocculating agent frequency conversion adding system which comprises a sewage pipe, a flocculating agent pipe, a first flow meter, a first liquid storage tank, a second liquid storage tank, a tee joint and a control mechanism, the sewage pipe and the flocculating agent pipe are connected to a sedimentation tank, and the first flow meter is used for detecting the flow of sewage in the sewage pipe; flocculating agents with known concentrations are stored in the first liquid storage tank and the second liquid storage tank, the first liquid storage tank is communicated with two liquid inlets of the tee joint through a first conveying pipe, the second liquid storage tank is communicated with two liquid inlets of the tee joint through a second conveying pipe, and a liquid outlet of the tee joint is communicated with the flocculating agent pipe; a first screw pump, a first electromagnetic valve and a second flow meter are arranged on the first conveying pipe, and a second screw pump, a second electromagnetic valve and a third flow meter are arranged on the second conveying pipe. And automatic control of flocculant adding is realized, and the adding amount is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and specifically designs a flocculant variable frequency dosing system. Background Art

[0002] In the field of sewage treatment, flocculants are used as a means to enhance solid-liquid separation. They can be used to enhance the primary sedimentation, flotation treatment and secondary sedimentation after the activated sludge method of sewage. They can also be used for tertiary treatment or deep treatment of sewage.

[0003] In the process of sewage treatment, flocculants need to be added to the sedimentation tank through dosing equipment. However, in the process of adding flocculants with existing dosing equipment, the amount of flocculants added is difficult to control. Excessive addition of flocculants will lead to excessive flocculation, which is not convenient for the subsequent treatment of sewage. Excessive addition of flocculants will lead to poor flocculation effect, which is not convenient for sewage treatment operations. Utility Model Content

[0004] The utility model provides a flocculant variable frequency dosing system, which can realize variable frequency control of a screw pump according to monitoring sewage flow, thereby accurately controlling the addition amount of the flocculant.

[0005] A flocculant variable frequency dosing system, comprising a sewage pipe and a flocculant pipe connected to a sedimentation tank, and also comprising a first flowmeter, a first liquid storage tank, a second liquid storage tank, a tee and a control mechanism, wherein the first flowmeter is used to detect the flow of sewage in the sewage pipe, the first liquid storage tank and the second liquid storage tank store flocculants with known concentrations, the first liquid storage tank is connected to two liquid inlets of the tee through a first delivery pipe, and the second liquid storage tank is connected to two liquid inlets of the tee through a second delivery pipe, respectively, and the liquid outlet of the tee is connected to the flocculant pipe, the first delivery pipe is provided with a first screw pump, a first solenoid valve and a second flowmeter, and the second delivery pipe is provided with a second screw pump, a second solenoid valve and a third flowmeter;

[0006] The control mechanism includes a PLC controller, a first frequency converter and a second frequency converter. The first flow meter, the second flow meter and the third flow meter are respectively connected to the signal input terminal group of the PLC controller. The signal output terminal group of the PLC controller is respectively electrically connected to the first frequency converter, the second frequency converter, the first solenoid valve and the second solenoid valve. The control signal output terminal of the first frequency converter is connected to the control signal input terminal of the first screw pump, and the control signal output terminal of the second frequency converter is connected to the control signal input terminal of the second screw pump.

[0007] Furthermore, a first liquid level gauge is arranged in the first liquid storage tank, and a second liquid level gauge is arranged in the second liquid storage tank, and signal output ends of the first liquid level gauge and the second liquid level gauge are both connected to the signal input end group of the PLC controller.

[0008] Furthermore, the control mechanism also includes a display module, which is electrically connected to the PLC controller. The PLC controller collects working status information of the first screw pump through the first frequency converter and collects working status information of the second screw pump through the second frequency converter, and sends the collected working status information to the display module for display.

[0009] Furthermore, the PLC controller is also connected to a status indicator light group, which is used to provide light indication for the collected working status information of the first screw pump and the second screw pump.

[0010] Furthermore, the status indicator light group includes a first status indicator light and a second status indicator light, the first status indicator light is used to provide light indication of the collected working status information of the first screw pump; the second status indicator light provides light indication of the collected working status information of the second screw pump.

[0011] Furthermore, the PLC controller is also connected to a communication module, which is used to communicate with the background control terminal.

[0012] Furthermore, the structure of the first liquid storage tank is consistent with that of the second liquid storage tank, wherein the first liquid storage tank comprises a tank body, a plurality of supporting legs are connected to the bottom of the tank body, a feed inlet is provided at the top of the tank body, a discharge port connected to the first conveying pipe is provided at the bottom of the tank body, a mixing motor is fixed at the center of the top of the tank body, a mixing shaft is connected to the output shaft of the mixing motor, the mixing shaft extends into the tank body and is connected to a plurality of mixing paddles.

[0013] Furthermore, a cover plate is provided on the feed port, an inner edge of the cover plate is hinged to the tank body, an outer side of the cover plate is tightly matched with an outer edge of the tank body, and a handle is provided on the cover plate.

[0014] Furthermore, the first flowmeter, the second flowmeter and the third flowmeter are all electromagnetic flowmeters.

[0015] Beneficial effects:

[0016] 1. By detecting the flow of sewage in the sewage pipe in real time and the flow of flocculant in the first delivery pipe or the second delivery pipe, the PLC controller controls the screw pump through the frequency converter according to the set ratio between the two, so as to accurately deliver the flocculant in the storage tank to the sedimentation tank according to the required amount of addition, thus realizing automatic control of flocculant addition, making the addition amount more accurate, improving the flocculation effect and reducing the content of flocculant in the effluent.

[0017] 2. Two main and standby flocculant dosing pipelines are formed, which can not only supply flocculants alternately according to the reserves of flocculants in the liquid storage tank, but also ensure the continuous supply of flocculants when the equipment on one of the pipelines is damaged or under maintenance.

[0018] 3. By collecting, displaying and lighting the working status information of the screw pump, the status of the screw pump can be displayed conveniently and intuitively, thereby improving the use effect.

[0019] 4. By communicating with the background control terminal through the communication module, the working status and fault alarm light information of the screw pump can be uploaded and stored in time, which helps to remind the staff to deal with it in time and analyze the cause of the fault afterwards.

[0020] 5. Both the first liquid storage tank and the second liquid storage tank are provided with a mixing structure, which can completely mix the flocculant and the solvent to avoid agglomeration and affect the flocculation and sedimentation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the pipeline structure of the utility model;

[0022] Figure 2 is a structural schematic diagram of a first liquid storage tank;

[0023] Figure 3 This is a control principle block diagram of the utility model. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with embodiments and drawings.

[0025] like Figure 1 As shown, this embodiment proposes a flocculant variable frequency dosing system, including a sewage pipe 16, a flocculant pipe 9, a first flow meter 17, a first liquid storage tank 1, a second liquid storage tank 11, a tee 8 and a control mechanism 7. The sewage pipe 16 and the flocculant pipe 9 are both connected to a sedimentation tank (not shown in the figure). The first flow meter 17 is used to detect the flow rate of sewage in the sewage pipe 16. The first liquid storage tank 1 and the second liquid storage tank 11 store flocculants with known concentrations. A first The liquid level meter 2 is provided with a second liquid level meter 12 in the second liquid storage tank 11. The first liquid storage tank 1 is connected to the two liquid inlets of the tee 8 through the first delivery pipe 6, and the second liquid storage tank 11 is connected to the two liquid inlets of the tee 8 through the first delivery pipe 6. The liquid outlet of the tee 8 is connected to the flocculant pipe 9. The first delivery pipe 6 is provided with a first screw pump 3, a first solenoid valve 4 and a second flowmeter 5. The second delivery pipe 10 is provided with a second screw pump 13, a second solenoid valve 14 and a third flowmeter 15.

[0026] According to the above pipeline structure, it can be seen that the first liquid storage tank 1, the first delivery pipe 6, the tee 8, and the flocculant tube 9 form a flocculant supply pipeline, and the second liquid storage tank 11, the first delivery pipe 6, the tee 8, and the flocculant tube 9 form a second flocculant supply pipeline, so that the system has two main and standby flocculant addition pipelines, which can not only supply alternately according to the flocculant reserves in the liquid storage tank, but also ensure the continuous supply of flocculant when the equipment on one of the pipelines is damaged or under maintenance.

[0027] In this embodiment, the first liquid storage tank 1 has the same structure as the second liquid storage tank 11, wherein the first liquid storage tank 1 is shown in FIG. Figure 2 , including a tank body 101, a plurality of supporting legs 102 are connected to the bottom of the tank body 101, a feed port 103 is opened at the top of the tank body 101, a discharge port 104 connected to the first conveying pipe 6 is opened at the bottom of the tank body 101, a mixing motor 105 is fixed at the center of the top of the tank body 101, a mixing shaft 106 is connected to the output shaft of the mixing motor 105, the mixing shaft 106 extends into the tank body 101 and is connected to a plurality of mixing paddles 107, a cover plate 108 is arranged on the feed port 103, the inner edge of the cover plate 108 is hinged to the tank body 101, the outer side of the cover plate 108 is tightly matched with the outer edge of the tank body 101, and a handle 109 is arranged on the cover plate 108.

[0028] By providing a mixing structure in both the first liquid storage tank 1 and the second liquid storage tank 11 , the flocculant and the solvent can be completely mixed to avoid agglomeration and thus avoid affecting the flocculation and sedimentation effect.

[0029] like Figure 3 As shown, the control principle of the system is shown in the figure, the control mechanism 7 includes a PLC controller, a first frequency converter and a second frequency converter, the first flow meter 17, the second flow meter 5, and the third flow meter 15 are respectively connected to the signal input terminal group of the PLC controller, and the signal output terminal group of the PLC controller is electrically connected to the first frequency converter, the second frequency converter, the first solenoid valve 4, and the second solenoid valve 14 respectively, the control signal output terminal of the first frequency converter is connected to the control signal input terminal of the first screw pump 3, the control signal output terminal of the second frequency converter is connected to the control signal input terminal of the second screw pump 13, and the signal output terminals of the first liquid level meter 2 and the second liquid level meter 12 are both connected to the signal input terminal group of the PLC controller.

[0030] In this embodiment, the control mechanism 7 also includes a display module, which is electrically connected to the PLC controller. The PLC controller collects the working status information of the first screw pump 3 through the first frequency converter and the working status information of the second screw pump 13 through the second frequency converter, and sends the collected working status information to the display module for display, so that the staff can easily know the working status and fault information of the first screw pump 3 and the second screw pump 13.

[0031] In this embodiment, the PLC controller is also connected to a status indicator light group, which is used to indicate the collected working status information of the first screw pump 3 and the second screw pump 13 by light. The status indicator light group includes a first status indicator light and a second status indicator light. The first status indicator light is used to indicate the collected working status information of the first screw pump 3 by light; the second status indicator light indicates the collected working status information of the second screw pump 13 by light. In specific applications, the first status indicator light and the second status indicator light can use lights of different colors to indicate different working states, such as green for normal operation, red for failure, yellow for maintenance, etc.

[0032] By collecting, displaying and lighting the working status information of the first screw pump 3 and the second screw pump 13, the status of the two screw pumps can be conveniently and intuitively displayed, thereby improving the use effect.

[0033] In this embodiment, the PLC controller is also connected to a communication module, which is used to communicate with the background control terminal. Through the communication module and the background control terminal, the working status of the screw pump and the fault alarm light information can be uploaded and stored in time, which helps to remind the staff to handle it in time and analyze the cause of the fault afterwards.

[0034] Preferably, the first flowmeter 17, the second flowmeter 5, and the third flowmeter 15 are all electromagnetic flowmeters.

[0035] Working principle:

[0036] First, the first liquid level meter 2 and the second liquid level meter 12 are used to detect the reserves of the flocculant in the first liquid storage tank 1 and the second liquid storage tank 11 respectively, so as to determine the pipeline for supplying the flocculant. The flocculant is supplied by the liquid storage tank storing sufficient flocculant. When the flocculant reserves in the two liquid storage tanks are sufficient, the first liquid storage tank 1 is given priority to supply.

[0037] If the flocculant is supplied from the first liquid storage tank 1, the PLC controller in the control mechanism 7 sends a control signal to the first solenoid valve 4 so that the first liquid storage tank 1 is connected to the flocculant tube 9 through the first delivery pipe 6, and then sends a control signal to start the first screw pump 3. After that, the flow of sewage in the sewage pipe is detected in real time by the first flow meter 17, and the amount of flocculant added is determined by the set ratio between sewage and flocculant. The flow of flocculant input into the flocculant tube 9 is detected by the second flow meter 5. The PLC controller performs frequency conversion control on the first screw pump 3 through the frequency converter according to the added amount, and controls the first screw pump 3 by changing the working power frequency of the first screw pump 3 to adjust the flocculant flow, so as to achieve the accurate addition requirement of the dosage.

[0038] If the flocculant is supplied from the second liquid storage tank 11, the PLC controller in the control mechanism 7 sends a control signal to the second solenoid valve 14 so that the second liquid storage tank 11 is connected to the flocculant tube 9 through the second delivery pipe 10, and then sends a control signal to start the second screw pump 13. After that, the flow of sewage in the sewage pipe is detected in real time by the first flow meter 17, and the amount of flocculant added is determined by the set ratio between sewage and flocculant. The flow of flocculant input into the flocculant tube 9 is detected by the third flow meter 15. The PLC controller performs frequency conversion control on the second screw pump 13 through the frequency converter according to the added amount, and controls the second screw pump 13 by changing the working power frequency of the second screw pump 13 to adjust the flocculant flow, so as to achieve the accurate addition requirement of the dosage.

[0039] In this process, the PLC controller collects the working status information of the first screw pump 3 through the first frequency converter or collects the working status information of the second screw pump 13 through the second frequency converter, and sends the collected working status information to the display module for display, and the first status indicator light indicates the collected working status information of the first screw pump 3 or the second status indicator light indicates the collected working status information of the second screw pump 13. This makes it easy for the staff to know the working status and fault information of the first screw pump 3 and the second screw pump 13.

[0040] In summary, this system uses the PLC controller to perform frequency conversion control on the screw pump through the frequency converter according to the detected sewage flow in the sewage pipe and the detected flocculant flow, so as to accurately transport the flocculant in the storage tank to the sedimentation tank according to the required addition amount, thereby realizing automatic control of flocculant addition, making the addition amount more accurate, improving the flocculation effect, and reducing the flocculant content in the effluent.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. A flocculant variable frequency dosing system, comprising a sewage pipe (16) and a flocculant pipe (9) connected to a sedimentation tank, characterized in that: It also comprises a first flow meter (17), a first liquid storage tank (1), a second liquid storage tank (11), a tee (8) and a control mechanism (7), wherein the first flow meter (17) is used to detect the flow of sewage in the sewage pipe (16), the first liquid storage tank (1) and the second liquid storage tank (11) store flocculants of known concentrations, the first liquid storage tank (1) is connected to the two liquid inlets of the tee (8) through a first delivery pipe (6), and the second liquid storage tank (11) is connected to the two liquid outlets of the tee (8) through a second delivery pipe (10), the liquid outlet of the tee (8) is connected to the flocculant pipe (9), the first delivery pipe (6) is provided with a first screw pump (3), a first solenoid valve (4) and a second flow meter (5), and the second delivery pipe (10) is provided with a second screw pump (13), a second solenoid valve (14) and a third flow meter (15); The control mechanism (7) comprises a PLC controller, a first frequency converter and a second frequency converter; the first flow meter (17), the second flow meter (5) and the third flow meter (15) are respectively connected to a signal input terminal group of the PLC controller; the signal output terminal group of the PLC controller is respectively electrically connected to the first frequency converter, the second frequency converter, the first solenoid valve (4) and the second solenoid valve (14); the control signal output terminal of the first frequency converter is connected to the control signal input terminal of the first screw pump (3); and the control signal output terminal of the second frequency converter is connected to the control signal input terminal of the second screw pump (13).

2. The flocculant variable frequency dosing system according to claim 1, characterized in that: A first liquid level gauge (2) is arranged in the first liquid storage tank (1), and a second liquid level gauge (12) is arranged in the second liquid storage tank (11); signal output ends of the first liquid level gauge (2) and the second liquid level gauge (12) are both connected to a signal input end group of the PLC controller.

3. The flocculant variable frequency dosing system according to claim 1, characterized in that: The control mechanism (7) further comprises a display module, which is electrically connected to the PLC controller. The PLC controller collects working status information of the first screw pump (3) through the first frequency converter and collects working status information of the second screw pump (13) through the second frequency converter, and sends the collected working status information to the display module for display.

4. The flocculant variable frequency dosing system according to claim 3 is characterized in that: The PLC controller is also connected to a status indicator light group, which is used to provide light indication of the collected working status information of the first screw pump (3) and the second screw pump (13).

5. The flocculant variable frequency dosing system according to claim 4, characterized in that: The status indicator light group comprises a first status indicator light and a second status indicator light, wherein the first status indicator light is used to provide a light indication of the collected working status information of the first screw pump (3); and the second status indicator light is used to provide a light indication of the collected working status information of the second screw pump (13).

6. The flocculant variable frequency dosing system according to claim 1, characterized in that: The PLC controller is also connected to a communication module, which is used for communication connection with a background control terminal.

7. The flocculant variable frequency dosing system according to any one of claims 1 to 6, characterized in that: The first liquid storage tank (1) has the same structure as the second liquid storage tank (11), wherein the first liquid storage tank (1) comprises a tank body (101), the bottom of the tank body (101) is connected to a plurality of supporting legs (102), a feed port (103) is provided at the top of the tank body (101), a discharge port (104) connected to the first conveying pipe (6) is provided at the bottom of the tank body (101), a mixing motor (105) is fixed at the center of the top of the tank body (101), a mixing shaft (106) is connected to the output shaft of the mixing motor (105), the mixing shaft (106) extends into the tank body (101) and is connected to a plurality of mixing paddles (107).

8. The flocculant variable frequency dosing system according to claim 7, characterized in that: A cover plate (108) is provided on the feed port (103), the inner edge of the cover plate (108) is hinged to the tank body (101), the outer side of the cover plate (108) is tightly matched with the outer edge of the tank body (101), and a handle (109) is provided on the cover plate (108).

9. The flocculant variable frequency dosing system according to any one of claims 1 to 6, characterized in that: The first flow meter (17), the second flow meter (5) and the third flow meter (15) are all electromagnetic flow meters.

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