Cleaning device for rotary drum grid filter

Abstract

The utility model discloses a cleaning device for a drum grille filter. The cleaning device comprises a drum screen, a collecting hopper, a brush, an air injection mechanism and a water injection mechanism, the roller screen is of a rotary controllable structure; the collecting hopper is arranged in a space enclosed by the drum screen, and a collecting opening of the collecting hopper is arranged upwards; the brush abuts against the upper portion of the roller screen. The air spraying mechanism and the water spraying mechanism are both arranged above the drum screen and are both aligned to the upper part of the drum screen; through mutual cooperation of the brush, the air injection mechanism and the water injection mechanism, the cleaning efficiency is improved, and therefore the problem that blockage is likely to occur in the prior art is practically solved.

Description

Technical Field

[0001] The utility model relates to the technical field of drum grid filters, in particular to a cleaning device for a drum grid filter. Background Technique

[0002] The primary sewage treatment process is mainly a solid separation process. The water inlet of the water plant often contains a large amount of large solid particles. To reduce the energy consumption and operation efficiency of the biological process, it is necessary to first perform solid-liquid separation through primary treatment. The traditional primary treatment methods are through grids, sedimentation tanks, and grit chambers. The separated solids are usually directly transported out.

[0003] In the existing primary treatment process, the removal rate of SS is relatively low, and the existing cyclone grit chamber cannot remove sand particles smaller than 0.2 mm. Therefore, primary filtration can further reduce the treatment load of subsequent processes. At the same time, the primary filtration has been improved and has a certain concentration effect. The particulate matter obtained through concentration has a good fermentation effect. Therefore, part of the carbon source can be recovered by means such as fermentation to achieve the recycling of organic matter.

[0004] Primary treatment should be able to reduce 20% of BOD and 50% of SS. This process is usually a physical treatment process. Among them, the application forms of primary filtration include drum type, rotary belt type, vibrating screen type, rotary disk type, etc.

[0005] Although primary filtration can intercept a lot of grid residues and pollutants, when the screen aperture is less than 0.5 mm, it is often prone to blockage, especially when the sewage contains more grease and fibers, the blockage situation is often more serious. This leads to problems such as frequent overflow of the filtration system or a decrease in treatment efficiency. Therefore, effective cleaning devices and methods are needed to solve this problem. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a cleaning device for a drum grid filter to solve the problem of easy blockage in the prior art.

[0007] To solve the above technical problems, the utility model provides a cleaning device for a drum grid filter, which includes a drum screen, a collection hopper, a brush, a jetting mechanism, and a water spraying mechanism; the drum screen is a rotationally controllable structure; the collection hopper is arranged within the space enclosed by the drum screen, and the collection opening of the collection hopper faces upward; the brush abuts against the upper part of the drum screen; both the jetting mechanism and the water spraying mechanism are arranged above the drum screen, and both the jetting mechanism and the water spraying mechanism are aligned with the upper part of the drum screen.

[0008] In one embodiment, the rotary drum screen filter cleaning device is provided with a water inlet chamber and a water outlet chamber; the side wall of the water inlet chamber is hollowed out from top to bottom to form an arc-shaped water guide port, and the water guide port connects the water inlet chamber and the water outlet chamber; the drum screen is arranged in the water outlet chamber, the water inlet side of the drum screen is connected to the water guide port, and the lowest position of the internal chamber of the drum screen is below the lowest arc position of the water guide port.

[0009] In one embodiment, a water level sensor is provided in the water inlet chamber; the rotary drum screen filter cleaning device is provided with a variable frequency motor, which is transmission-connected to the drum screen, and is used to adjust the rotation speed of the drum screen according to the detection result of the water level sensor.

[0010] In one embodiment, the lowest position of the internal chamber of the drum screen is at least 5 cm below the lowest position of the water guide port.

[0011] In one embodiment, a plurality of pulleys are provided inside the rotary drum screen filter cleaning device, the drum screen is supported on the plurality of pulleys, and the drum screen is in rolling contact with the plurality of pulleys.

[0012] In one embodiment, the brush is disposed in a space enclosed by the drum screen, the brush is extended along the axial direction of the drum screen, and the brush abuts against an upper portion of the drum screen.

[0013] In one embodiment, the multiple air jet nozzles of the air jet mechanism are arranged to extend along the axial direction of the drum screen; the multiple water jet nozzles of the water jet mechanism are arranged to extend along the axial direction of the drum screen.

[0014] In one embodiment, the brush, the air jet mechanism, and the water spray mechanism are arranged in sequence along the drum screen cleaning line.

[0015] In one embodiment, the mesh size of the drum screen is 0.15 mm to 1 mm.

[0016] The beneficial effects of the utility model are as follows:

[0017] First, by fixing the brush below the surface of the drum screen and making it contact with the drum screen, for example, setting the brush perpendicular to the drum screen, when the pollutants intercepted by the drum screen pass through the brush, they will be subjected to friction in the opposite direction of the drum screen's rotation, so that the accumulated sludge is intercepted and the sludge on the drum screen becomes loose and easy to fall off. Therefore, the brush plays the role of loosening and scraping off the intercepted materials on the surface of the drum screen.

[0018] Then, the jetting mechanism can be composed of an air compressor and a jetting port. The air compressor generates gas and blows it through the narrow jetting port onto the surface of the drum screen. It should be noted that the jetting port should be directed towards the surface of the drum screen and the collection hopper. The air knife with pressure will blow the sludge on the surface of the drum screen towards the collection hopper.

[0019] Finally, after the air flushing, as a cleaning method with a stronger cleaning effect, the installation of the water spraying mechanism is the same as that of the jetting mechanism. The source of hot water can use the filtered effluent. After being heated by components such as an electric heating plate or a heating plate, it forms a pressurized water column or atomized droplets after passing through the narrow nozzle, and elutes the viscous substances such as grease that are difficult to remove by air flushing.

[0020] During operation, the three components should work simultaneously because their respective functions complement each other. The brush can prevent large particles and fibers from adhering, and can also make the dirt formed on the drum screen become loose, facilitating blowing-off and elution. Therefore, the brush should be before air flushing and water flushing. Air flushing can play a role in blowing-off, blowing off the fine sand and fibers on the drum screen. After air flushing, further water flushing is carried out with the filtered water heated, which plays a role in improving the flushing efficiency and enabling the drum screen to quickly return to a clean state. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is the structural schematic diagram provided by the embodiment of the present invention;

[0023] Figure 2 is Figure 1 the side view structural schematic diagram of;

[0024] Figure 3 is Figure 1 the partial structural schematic diagram of.

[0025] The reference numerals are as follows:

[0026] 10. Drum screen; 11. Screen frame; 12. Screen; 13. Fixed plate; 14. Annular frame; 15. Small gear; 16. Variable frequency motor; 17. Water level sensor; 18. Pulley;

[0027] 20. Collection hopper;

[0028] 30. Brush;

[0029] 40. Jetting mechanism; 41. Jetting nozzle; 42. Air pipe;

[0030] 50. Water spraying mechanism; 51. Water spraying nozzle; 52. Water storage tank; 53. Heater;

[0031] 61. Water inlet chamber; 62. Water outlet chamber; 63. Water guiding port; 64. Water inlet; 65. Water outlet. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0033] The present utility model provides a cleaning device for a drum grille filter, and its embodiments are as Figures 1 to 3 shown, including a drum screen 10, a collection hopper 20, a brush 30, a jetting mechanism 40 and a water spraying mechanism 50; the drum screen 10 is a rotationally controllable structure; the collection hopper 20 is arranged in the space enclosed by the drum screen 10, and the collection port of the collection hopper 20 is arranged upward; the brush 30 abuts against the upper part of the drum screen 10; the jetting mechanism 40 and the water spraying mechanism 50 are both arranged above the drum screen 10, and the jetting mechanism 40 and the water spraying mechanism 50 are both aligned with the upper part of the drum screen 10.

[0034] Among them, the drum screen 10 can be made of stainless steel material or fiber material. The former has higher strength and corrosion resistance, and the latter can form a thicker filter membrane; since the drum screen 10 may be subject to wear and deformation after long-term use, therefore, the need for disassembly and replacement should also be considered, so the drum screen 10 can be set in a form that is convenient for disassembly and assembly.

[0035] In addition, in this embodiment, the mesh aperture of the drum screen 10 is set to be 0.15 mm to 1 mm. Within this range, a part of the insoluble organic solids can be intercepted. Generally, a smaller aperture screen can form a filter membrane faster, and a larger aperture screen has stronger flow-through ability. Therefore, when the solid interception rate needs to reach a treatment effect similar to that of a sedimentation tank, it is recommended that the aperture be 0.15 to 0.5 mm. When the requirement for the solid interception rate is not high, the aperture can be increased to improve the flow-through ability.

[0036] Furthermore, as Figure 1 shown, the drum screen 10 is composed of a screen frame 11 supporting a screen 12, and the screen frame 11 is made of stainless steel. The left end of the screen frame 11 is a fixed plate 13 with a gear, and the right end is an annular frame 14. The formed drum screen 10 can be meshed with a small gear 15 extending from the outer frame wall of the device and rotated under the drive of a variable frequency motor 16. Among them, the variable frequency motor 16 can adjust the rotation speed of the drum screen 10.

[0037] As Figure 1and Figure 2 As shown in Figure 2 , in this embodiment, an inner part of a cleaning device of a drum grille filter is provided with a water inlet chamber 61 and a water outlet chamber 62; a water guiding port 63 is formed by hollowing out a side wall of the water inlet chamber 61 from top to bottom, and the water guiding port 63 communicates the water inlet chamber 61 and the water outlet chamber 62; a drum screen 10 is arranged in the water outlet chamber 62, one port of the drum screen 10 communicates with the water guiding port 63, and the lowest position of this port of the drum screen 10 is below the lowest position of the water guiding port 63.

[0038] When the drum grille filters, waste water enters the water inlet chamber 61 through a water inlet 64. When the water level is higher than the lowest point of the arc of the water guiding port 63, the sewage reaches the water outlet chamber 62 after passing through the drum screen 10 and flows out from a water outlet 65. The water guiding port 63 is in an arc form with a lower middle part and higher two sides, and the edge of the drum screen 10 and the upper side of the water guiding port 63 are mutually connected by installing an arc-shaped plate to ensure that the inlet water will not flow out from the connection gap under normal water level. When the inlet water level is too high, the sewage can flow out from both sides of the water guiding port 63 as a measure to cope with the situation that the inlet water flow exceeds the processing load of the drum screen.

[0039] As Figure 1 shown in Figure 1 , in this embodiment, a water level sensor 17 is arranged in the water inlet chamber 61; the cleaning device of the drum grille filter is provided with a variable-frequency motor 16, and the variable-frequency motor 16 is in transmission connection with the drum screen 10. The variable-frequency motor 16 is used to adjust the rotation speed of the drum screen 10 according to the detection result of the water level sensor 17.

[0040] As Figure 1 and Figure 2 shown in Figure 2 , in this embodiment, the lowest position of the port of the drum screen 10 is at least 5 cm below the lowest position of the water guiding port 63.

[0041] Because the sewage passes through the drum screen 10 with the liquid level difference between upstream and downstream as the driving force, the filtering driving force should not be less than 5 cm, otherwise it is easy to cause a small processing flow. It should be noted that when the liquid level in the water inlet chamber 61 passes over the highest point of the upstream water guiding port 63, the cleaning intensity or the rotation speed of the drum screen 10 should be increased to avoid an overflow phenomenon.

[0042] As Figure 1 shown in Figure 1 , in this embodiment, a plurality of pulleys 18 are arranged inside the cleaning device of the drum grille filter. The drum screen 10 is supported on the plurality of pulleys 18, and the drum screen 10 is in rolling contact with the plurality of pulleys 18, so as to ensure that the drum screen 10 does not shift.

[0043] As Figure 2 shown in Figure 2 , in this embodiment, a brush 30 is arranged in the space enclosed by the drum screen 10. The brush 30 extends along the axial direction of the drum screen 10, and the brush 30 abuts against the upper part inside the drum screen 10.

[0044] As Figure 2and Figure 3 As shown, in this embodiment, a plurality of jet nozzles 41 of the jet mechanism 40 are arranged to extend along the axial direction of the drum screen 10; a plurality of water spray nozzles 51 of the water spray mechanism 50 are arranged to extend along the axial direction of the drum screen 10.

[0045] As Figure 2 shown, in this embodiment, the brush 30, the jet mechanism 40, and the water spray mechanism 50 are arranged in the order of the cleaning line of the drum screen 10.

[0046] Specifically, the brush 30 is arranged inside the drum screen 10, the jet mechanism 40 is arranged outside the drum screen 10, and the jet orifice should be close to the drum screen 10, and the jet mechanism 40 should be before the water spray mechanism 50. The jet mechanism 40 and the water spray mechanism 50 should be close to the drum screen 10, and the nozzle direction points to the collection hopper 20, because being close to the drum screen 10 can increase the cleaning effect.

[0047] The flushing water volume of the nozzle can be 5 - 20 L / (m·min), specifically subject to the operating conditions of the drum screen 10 and the treatment requirements. The water flow rate can be 1% to 5% of the inlet water flow rate, and the pressure of the water column should be 0.5 - 2 bar. The pressure of the compressed air should not be less than 0.5 bar.

[0048] The specific application process of this embodiment is as follows:

[0049] After the sewage passes through the drum screen 10, some particulate pollutants are captured, and the filtered water then passes through the drum screen 10 and enters the downstream. Some of the intercepted pollutants rotate with the drum screen 10 and are brought above the collection hopper 20 with a width equivalent to that of the drum screen 10.

[0050] When the sludge intercepted by the drum screen 10 passes through the brush 30 fixed above the collection hopper 20, some small particulate substances and fibers will be intercepted under the resistance of the brush 30 and fall into the collection hopper 20. The shape of the collection hopper 20 can be V-shaped, with an arc-shaped pipe at the bottom, or it can be integrally made into an arc shape. The bottom can have a certain slope to help the particulate sludge enter the slag outlet and be discharged.

[0051] Among them, the bristles of the brush 30 should be slightly denser, and ensure uniform distribution, and the bristles need to have a certain hardness, not too soft. The material should be corrosion-resistant and wear-resistant, such as polybutyl ester or nylon 610 material. The angle and height of the brush 30 should make the ends of its bristles have the largest contact area with the drum screen 10, and should not be too long or too short. A suitable length can be 5 - 15 cm. Being too long is likely to cause the bristles to deform and the friction force to be insufficient, while being too short will cause the bristles to be easily worn and increase the wear of the drum screen 10.

[0052] Furthermore, when the drum screen 10 passes under the brush 30 and then comes under the air jet mechanism 40, the loose sludge and intercepted small particles fall into the lower collection hopper 20 under the scouring of the gas. Therefore, the air scouring pressure should be large enough, and the air jet mechanism 40 should be close to the drum screen 10 to ensure that the drum screen 10 can be kept clean. The air scouring pressure should not be less than 50 kPa, and the distance from the drum screen 10 should not exceed 10 cm.

[0053] The layout width of the air jet mechanism 40 is the same as the width of the drum screen 10, and it is composed of air jet nozzles 41 and air pipes 42, and the air jet direction points to the collection hopper 20. The air distribution method of the air jet mechanism 40 can be to use multiple air jet nozzles 41 with narrow openings for air distribution, or an air knife with a narrow and long slit across the drum screen 10 as the opening, so that the gas can be evenly distributed over the entire drum screen 10. The width of the pores can be 1 - 4 mm. The narrower the pores, the easier it is to generate sufficient air pressure and increase the pressure received by the drum screen 10.

[0054] After air scouring, the drum screen 10 has to go through the last step of water scouring. Among them, the water spraying mechanism 50 generates hot water by heating equipment such as a water storage tank 52 and a heater 53. The heater 53 can use an electric heating tube or a heating plate. The source of the hot water can be the filtered water, and the temperature of the hot water should be 30 - 70 °C. Among them, after heating, the outlet water temperature is preferably around 50 °C. The water pump pumps water and sprays a pressurized water column or water mist onto the drum screen 10 through the water spraying nozzles 51. In practical applications, the water spraying nozzles 51 can also be changed to slits, water distribution troughs, etc. for water distribution. The width of the slit can be 1 - 4 mm. In practical applications, the water pressure of the water flow can be increased by reducing the opening size of the water spraying nozzles 51 to improve the cleaning ability.

[0055] As Figure 1 shown, a water level sensor 17 should be arranged at the water inlet of the device. The rotation speed of the drum screen 10 is controlled by detecting the change of the water inlet level. When the liquid level rises, by increasing the rotation speed, the drum screen 10 is made to experience the cleaning process more frequently, which will increase the flow-through capacity of the drum screen 10. When the liquid level drops, by reducing the rotation speed, the flow-through time and flow-through load of the drum screen 10 are increased, so that a good filter membrane is formed on the drum screen 10 before it is cleaned, thereby improving the interception effect of particulate matter and organic matter during filtration. After testing, when the hydraulic load is 100 m / h, the removal rate is better. However, when the hydraulic load is too high, a higher screen rotation speed is required, increasing the operating energy consumption. At the same time, when the cleaning intensity increases, the screen will be cleaner, so that the device can operate at a lower rotation speed. According to the test, the rotation speed of the drum screen 10 is more suitable at 1 - 3 rpm.

[0056] After brushing, air flushing and water flushing, the drum screen 10 will quickly recover its best flow-through capacity. The sludge and liquid mixture will be washed away with the collection hopper 20. The solid content of this part of the sludge is mainly affected by the flushing water volume. Reducing the flushing water or adding a screw press can significantly increase the solid content of the sludge. According to tests, when the screw press is not added, the highest solid content can reach 20%, and the proportion of volatile solids content can reach 80%. The relatively high content of poorly soluble organic matter and the low moisture content make the intercepted matter have good fermentation potential.

[0057] The high solid and organic matter removal rates in primary treatment help reduce the energy consumption and floor area of the secondary wastewater treatment process after primary treatment and the entire wastewater treatment plant. By using the above cleaning method, the microscreen can operate more stably. Through experiments, when treating municipal sewage with a 0.35-mm screen, a suspended particle removal rate of about 50% and an organic matter removal rate of 30% can be achieved when the water level difference between the upstream and downstream is 20 cm and a good filter membrane is formed. At this removal rate, the flow-through capacity of the screen can be maintained at about 100 m 3 / (m 2 ·h).

[0058] Meanwhile, as described above, the filter can be used for the primary treatment of sewage upstream of the membrane bioreactor. The primary sludge can be anaerobically digested directly or indirectly. In these applications, the microporous screen can also be used to treat activated sludge or other biologically treated sludge, either entirely or mixed with untreated sewage. Theoretically, operating in the state of forming a filter mat can improve the removal of fine particles, thereby improving the energy efficiency of the wastewater treatment plant.

[0059] The above is the preferred implementation mode of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A cleaning device for a rotary drum screen filter, characterized in that: It includes a drum screen, a collecting bucket, a brush, an air jet mechanism and a water spray mechanism; The drum screen is a rotationally controllable structure; The collecting hopper is arranged in the space enclosed by the drum screen, and the collecting port of the collecting hopper is arranged upward; The brush abuts against the upper portion of the drum screen; The air jet mechanism and the water spray mechanism are both arranged above the drum screen, and the air jet mechanism and the water spray mechanism are both aligned with the upper part of the drum screen.

2. The cleaning device for the rotary drum screen filter according to claim 1, characterized in that: The drum screen filter cleaning device is provided with a water inlet chamber and a water outlet chamber; The side wall of the water inlet cavity is hollowed out from top to bottom to form an arc-shaped water guide port, and the water guide port connects the water inlet cavity and the water outlet cavity; The drum screen is arranged in the water outlet cavity, the water inlet side of the drum screen is connected to the water guide port, and the lowest position of the internal cavity of the drum screen is below the lowest arc position of the water guide port.

3. The cleaning device for the rotary drum screen filter according to claim 2, characterized in that: A water level sensor is provided in the water inlet chamber; The drum screen filter cleaning device is provided with a variable frequency motor, which is transmission-connected to the drum screen. The variable frequency motor is used to adjust the rotation speed of the drum screen according to the detection result of the water level sensor.

4. The cleaning device for the rotary drum screen filter according to claim 3, characterized in that: The lowest position of the internal chamber of the drum screen is at least 5 cm below the lowest position of the water guide port.

5. The cleaning device for the rotary drum screen filter according to claim 1, characterized in that: A plurality of pulleys are provided inside the rotary drum screen filter cleaning device, the drum screen is supported on the plurality of pulleys, and the drum screen is in rolling contact with the plurality of pulleys.

6. The cleaning device for the rotary drum screen filter according to claim 1, characterized in that: The brush is arranged in a space enclosed by the drum screen, and the brush is arranged to extend along the axial direction of the drum screen. The brush abuts against the upper part of the drum screen.

7. The cleaning device for the rotary drum screen filter according to claim 1, characterized in that: The plurality of air jet nozzles of the air jet mechanism are arranged to extend along the axial direction of the drum screen; The multiple water spray nozzles of the water spray mechanism are arranged to extend along the axial direction of the drum screen.

8. The cleaning device for the rotary drum screen filter according to claim 1, characterized in that: The brush, the air jet mechanism, and the water spray mechanism are arranged in sequence along the drum screen cleaning line.

9. The cleaning device for a rotary drum screen filter according to claim 1, characterized in that: The mesh diameter of the drum screen is 0.15 mm to 1 mm.

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