Medicament mixer for sludge treatment

Abstract

The utility model relates to the technical field of sewage sludge treatment, and discloses a medicament mixer for sludge treatment, which comprises a shaftless pump, a baffle ring I, a baffle ring II and a pH value detection tool, and is characterized in that the shaftless pump sucks water-containing sludge through the baffle ring I and discharges the water-containing sludge through the baffle ring II and the pH value detection tool; compared with the prior art, the sludge mixing device has the advantages that the occupied space is small, the sludge mixing device can be directly connected into an existing dehydration production line in series, the bending blades of the first baffling ring and the second baffling ring enable sludge to bear shear force and form turbulent flow, the mixing uniformity is improved, the mixing efficiency is improved, and the mixing effect is improved. According to the pH value detection tool, a relatively stable area with a slow flow rate is formed at the position of the pH probe, so that the impact of high-speed fluid on the probe is effectively avoided, and the contact time is prolonged, so that the pH measured value is more accurate and stable.

Description

Technical Field

[0001] This utility model relates to the field of sewage and sludge treatment technology, specifically to a sludge treatment agent mixer. Background Technology

[0002] Wastewater treatment generates a large amount of sludge. In order to reduce transportation and treatment costs, the most important part of sludge pretreatment is to reduce the volume of sludge through solid-water separation.

[0003] Sludge dewatering treatment typically includes: sludge conditioning, which uses chemical flocculants to fully separate the water from the sludge; and a dewatering process, which uses dewatering machinery to dewater the flocculated sludge. The success of sludge dewatering treatment largely depends on the effectiveness of sludge conditioning. Current literature indicates that using free nitrite (FNA) to treat sludge can improve sludge dewatering performance. However, since free nitrite cannot be obtained directly, nitrite must be added first, followed by dilute hydrochloric acid to generate free nitrite (FNA) in the reaction system. This process is reversible, so the pH value must be carefully considered when adding the nitrite. Furthermore, the mixing effect of commonly used stirring devices is not ideal, which increases the consumption of treatment agents and also leads to poor sludge conditioning, affecting the subsequent mechanical dewatering performance of the sludge.

[0004] Under normal circumstances, the sludge in the secondary sedimentation tank of a wastewater treatment plant has a water content of around 99%. For sludge with such high water content, current mixing devices cannot control the pH value at all times during the process of adding chemicals and fully mixing the sludge with the treatment chemicals, so the ideal conditioning effect cannot be achieved. It is often necessary to repeatedly verify whether the pH value is within the reasonable adjustment range, which greatly increases the cost of sludge conditioning and also leads to problems such as poor dewatering effect and slow dewatering speed. Utility Model Content

[0005] The technical problem to be solved by this invention is that existing mixing devices cannot keep track of the pH value at all times during the process of adding chemicals and mixing sludge with treatment chemicals. This invention provides a chemical mixer for sludge treatment.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a sludge treatment agent mixer, including a shaftless pump, a first baffle ring, a second baffle ring, and a pH value detection device. The two ends of the shaftless pump are connected to the first baffle ring and the second baffle ring respectively. The second baffle ring is provided with a pH value detection device at its end. The shaftless pump draws in water-containing sludge through the first baffle ring and discharges it through the second baffle ring and the pH value detection device. Both the first and second baffle rings have multiple baffle blades arranged around their interior. One side of the baffle blade is straight and the other side is bent. The bent surface of the baffle blades in the first and second baffle rings faces the shaftless pump. The first baffle ring is provided with multiple dosing check valves. The outlet end of the dosing check valve is located at the bent surface of the baffle blade.

[0007] Furthermore, the shaftless pump is internally fitted with a rotor ring, and both ends of the shaftless pump are provided with annular bearings that cooperate with the rotor ring, with a sealing ring on the outer end face of the annular bearing.

[0008] Furthermore, the shaftless pump is internally fixedly fitted with a coil winding, and a plurality of permanent magnets are provided around the outer side of the rotor ring.

[0009] Furthermore, the inner ring of the rotor ring is provided with multiple pump wheel blades, and the direction of the pump wheel blades is opposite to that of the deflector blades.

[0010] Furthermore, the top of the dosing check valve is provided with a dosing chamber, and a dosing pipe is connected to the side of the dosing chamber.

[0011] Furthermore, the dosing check valve is provided with an axially sliding check valve core, and a spring is provided on the outer side of the top of the dosing chamber to push the check valve core toward the top of the dosing chamber. When the check valve core is at the top point, it seals the outlet end of the dosing check valve.

[0012] Furthermore, a reduction gear cylinder is installed inside the pH detection fixture. One end of the reduction gear cylinder converges while the other end expands, with the converged end pointing towards the shaftless pump. A pH transmitter is installed on the pH detection fixture, and the probe end of the pH transmitter extends into the expansion section of the reduction gear cylinder.

[0013] The advantages of this utility model compared with the prior art are as follows:

[0014] The device can be integrated with existing sludge treatment pipelines, occupies little space, and is suitable for upgrading and retrofitting wastewater treatment plants with limited space. It can be directly connected in series to existing dewatering production lines.

[0015] The bent blade design of baffle ring one and baffle ring two can generate multi-stage directional flow. This process subjectes the sludge to shear force and forms turbulence, improving the mixing uniformity.

[0016] When the mixed sludge flows through the pH testing fixture, the flow rate first increases and then decreases, forming a relatively stable area with a slower flow rate at the pH probe position. This effectively avoids the impact of high-speed fluid on the probe and increases the contact time, thereby making the pH measurement value more accurate and stable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a chemical mixer for sludge treatment.

[0018] Figure 2 This is a schematic diagram of the exploded structure of a sludge treatment agent mixer.

[0019] Figure 3 This is a schematic diagram of the baffle blades of a chemical mixer for sludge treatment.

[0020] Figure 4 This is an exploded structural diagram of a shaftless pump for mixing chemicals used in sludge treatment.

[0021] Figure 5 This is a schematic diagram of the exploded structure of the rotor ring of a sludge treatment agent mixer.

[0022] Figure 6 This is a schematic diagram of the dosing check valve in a sludge treatment chemical mixer.

[0023] Figure 7 This is a schematic diagram of the structure of the dosing check valve of the sludge treatment agent mixer when it is open.

[0024] Figure 8 This is a schematic diagram of the pH value detection fixture for a sludge treatment agent mixer.

[0025] As shown in the figure: 1. Shaftless pump, 2. Baffle ring one, 3. Baffle ring two, 4. pH value detection fixture, 5. Annular bearing, 6. Sealing ring, 7. Rotor ring, 8. Coil winding, 9. Permanent magnet, 10. Baffle blade, 11. Dosing check valve, 12. Check valve core, 13. Dosing chamber, 14. Dosing pipe, 15. Lifting bracket, 16. Reducer, 17. pH value transmitter, 18. Pump impeller blade. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] Combined with appendix Figure 1 Appendix Figure 2 Appendix Figure 3 and attached Figure 6 , including Figure 1The direction indicated by the inner arrow is the direction in which the shaftless pump 1 transports water-containing sludge. A sludge treatment agent mixer includes a shaftless pump 1, a first baffle ring 2, a second baffle ring 3, and a pH value detection device 4. The two ends of the shaftless pump 1 are connected to the first baffle ring 2 and the second baffle ring 3, respectively. The second baffle ring 3 is provided with a pH value detection device 4 at its end. The shaftless pump 1 draws in water-containing sludge through the first baffle ring 2 and discharges it through the second baffle ring 3 and the pH value detection device 4. Both the first baffle ring 2 and the second baffle ring 3 have multiple baffle blades 10 arranged around its interior. One side of the baffle blade 10 is straight and the other side is bent. The bent surfaces of the baffle blades 10 in the first baffle ring 2 and the second baffle ring 3 all face the shaftless pump 1. The first baffle ring 2 is provided with multiple dosing check valves 11. The outlet end of the dosing check valve 11 is located at the bent surface of the baffle blade 10.

[0028] Combined with appendix Figure 6 and attached Figure 7 The dosing check valve 11 is equipped with an axially sliding check valve core 12. A spring is installed on the outer side of the top of the dosing chamber 13 to push the check valve core 12 towards the top of the dosing chamber 13. When the check valve core 12 is pushed to its limit, it seals the outlet end of the dosing check valve 11. When there is no pressure difference between the inside and outside of the device or the internal sludge pressure is greater than the external pressure, the spring force can keep the check valve core 12 sealing the dosing check valve 11, thereby achieving the effect of preventing sludge backflow.

[0029] When the water-containing sludge is in accordance with the attached Figure 1 When the sludge flows in the direction indicated by the inner arrow, it will be deflected by the baffle blades 10 inside the baffle ring 2. The pressure of the sludge on the front side of the baffle blades 10 increases, while the pressure on the back side decreases, resulting in a low-pressure zone at the outlet of the dosing check valve 11. This allows the check valve core 12 to retract inward against the spring force due to the pressure difference between the inside and outside, thereby opening the dosing check valve 11. This achieves the effect that the dosing check valve 11 can only be opened for dosing when the device is working.

[0030] Combined with appendix Figure 4 and attached Figure 5 The shaftless pump 1 is internally fitted with a rotor ring 7. Both ends of the shaftless pump 1 are provided with ring bearings 5 ​​that cooperate with the rotor ring 7. The outer end face of the ring bearing 5 is provided with a sealing ring 6. Multiple pump wheel blades 18 are arranged around the inner ring of the rotor ring 7. The direction of the pump wheel blades 18 is opposite to that of the deflector blades 10.

[0031] With attachment Figure 3With the direction shown as a reference, the rotor ring 7 rotates clockwise to cause the water-containing sludge to flow. In this state, after the sludge passes through the first baffle ring 2, it will rotate clockwise due to the deflection of the baffle blades 10. When the sludge flows through the rotor ring 7, it will be pushed counterclockwise by the pump wheel blades 18. The baffle blades 10 in the second baffle ring 3 are bent in a clockwise direction. The sludge flowing out of the rotor ring 7 has a large angle of attack with the baffle blades 10 in the second baffle ring 3. After being deflected again, it stops rotating after being guided by the straight surface of the baffle blades 10 and only flows axially. When the rotational flow direction of the water-containing sludge is changed, it will be subjected to shear force from the blades and generate turbulence, so that the added agent is fully mixed with the sludge under the action of shear and turbulence.

[0032] Combined with appendix Figure 4 and attached Figure 5 The shaftless pump 1 is internally fixedly fitted with a coil winding 8, and a plurality of permanent magnets 9 are provided around the outer side of the rotor ring 7, forming an internal rotor brushless motor structure, thereby driving the rotor ring 7 to rotate. The corresponding brushless motor drive device is a common technology and will not be further described in this application.

[0033] Combined with appendix Figure 5 and attached Figure 6 The top of the dosing check valve 11 is provided with a dosing chamber 13, and the side of the dosing chamber 13 is connected to a dosing pipe 14. In a specific implementation of this application, it is used for sludge dewatering process of co-conditioning with free nitrite. This process requires the addition of nitrite, dilute hydrochloric acid and sludge-based biochar to the water-containing sludge. Therefore, this device should have at least 3 dosing check valves 11 for adding the above-mentioned reaction agents.

[0034] Combined with appendix Figure 8 The pH detection fixture 4 is equipped with a lifting bracket 15 inside, and a reduction cylinder 16 is provided at the bottom of the lifting bracket 15. One end of the reduction cylinder 16 converges and the other end expands, with the convergent end pointing towards the shaftless pump 1. The pH detection fixture 4 is equipped with a pH transmitter 17, and the probe end of the pH transmitter 17 extends into the expansion section of the reduction cylinder 16. Part of the sludge after being mixed with chemicals enters the reduction cylinder 16. It accelerates when passing through the convergent section and decelerates after entering the expansion section, and comes into contact with the probe of the pH transmitter 17. This reduces the flow rate of the sludge with the probe of the pH transmitter 17, increases the residence time, and ensures accurate pH detection.

[0035] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A sludge treatment agent mixer, comprising a shaftless pump (1), a first baffle ring (2), a second baffle ring (3), and a pH value detection fixture (4), characterized in that: The shaftless pump (1) is connected to baffle ring 1 (2) and baffle ring 2 (3) at both ends respectively. A pH value detection fixture (4) is provided at the end of baffle ring 2 (3). The shaftless pump (1) sucks in water-containing sludge through baffle ring 1 (2) and discharges it through baffle ring 2 (3) and pH value detection fixture (4). Multiple baffle blades (10) are arranged around the inside of baffle ring 1 (2) and baffle ring 2 (3). One side of the baffle blade (10) is straight and the other side is bent. The bent surface of the baffle blades (10) in baffle ring 1 (2) and baffle ring 2 (3) faces the shaftless pump (1). Multiple dosing check valves (11) are provided inside the baffle ring 1 (2). The outlet end of the dosing check valve (11) is located at the bent surface of the baffle blade (10).

2. The sludge treatment reagent mixer according to claim 1, characterized in that: The shaftless pump (1) is internally fitted with a rotor ring (7), and the shaftless pump (1) is provided with ring bearings (5) at both ends that cooperate with the rotor ring (7). The outer end face of the ring bearing (5) is provided with a sealing ring (6).

3. The sludge treatment reagent mixer according to claim 2, characterized in that: The shaftless pump (1) is fitted with a coil winding (8) and a plurality of permanent magnets (9) are provided on the outer side of the rotor ring (7).

4. A sludge treatment reagent mixer according to claim 2, characterized in that: The inner ring of the rotor ring (7) is provided with multiple pump wheel blades (18), and the direction of the pump wheel blades (18) is opposite to that of the deflector blades (10).

5. A sludge treatment reagent mixer according to claim 1, characterized in that: The top of the dosing check valve (11) is provided with a dosing chamber (13), and the side of the dosing chamber (13) is connected to a dosing pipe (14).

6. A sludge treatment reagent mixer according to claim 5, characterized in that: The dosing check valve (11) is provided with an axially sliding check valve core (12). A spring is provided on the outer side of the top of the dosing chamber (13) to push the check valve core (12) towards the top of the dosing chamber (13). When the check valve core (12) is pushed to the limit, the outlet end of the dosing check valve (11) is sealed.

7. A sludge treatment reagent mixer according to claim 1, characterized in that: The pH detection fixture (4) is equipped with a speed reducer (16) inside. One end of the speed reducer (16) converges while the other end expands. The converged end points towards the shaftless pump (1). The pH detection fixture (4) is equipped with a pH transmitter (17). The probe end of the pH transmitter (17) extends into the expansion section of the speed reducer (16).

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