CN223170502U - Rotary drum grille filter cleaning device - Google Patents

Abstract

The utility model discloses a cleaning device for a rotary drum screen filter, comprising 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 bucket is arranged in a space enclosed by the drum screen, and a collecting port of the collecting bucket is arranged upward; the brush abuts against the upper part of the drum screen; the air jet mechanism and the water spray mechanism are both arranged above the drum screen, and are both aimed at the upper part of the drum screen; that is, the cleaning efficiency is improved by the mutual cooperation of the brush, the air jet mechanism and the water spray mechanism, thereby effectively solving the problem that the prior art is prone to clogging.

Description

Rotary drum grille filter cleaning device

Technical Field

The utility model relates to the technical field of rotary drum grating filters, in particular to a cleaning device of a rotary drum grating filter.

Background

The primary sewage treatment process is mainly a solid separation process, and water inflow of a water plant often contains a large amount of solid and large particles, so that the solid-liquid separation is needed to be carried out through primary treatment in order to reduce the energy consumption and the operation efficiency of a biological process. The traditional primary treatment method is to pass through a grid, a sedimentation tank and a sand setting tank. The separated solids are typically directly transported out.

The prior primary treatment process has lower removal rate of SS, and the prior cyclone sand basin can not remove sand grains below 0.2mm, so the treatment load of the subsequent process can be further reduced by using primary filtration. Meanwhile, the primary filtration is improved, a certain concentration effect is achieved, and the granular substances obtained through concentration have good fermentation effect, so that part of carbon sources can be recycled in a fermentation mode and the like, and recycling of organic matters is achieved.

The primary treatment should be able to reduce BOD by 20% and SS by 50%. This process is typically a physical process. Among them, the application forms of the primary filtration are drum type, rotary belt type, vibrating screen type, rotary disc type, etc.

Although the primary filtration can retain a lot of grid residues and pollutants, when the aperture of the screen is smaller than 0.5mm, the screen is easy to be blocked, and particularly when the sewage contains more grease and fibers, the blocking situation is more serious. This results in problems such as frequent overflow of the filtration system, or reduced treatment efficiency. There is therefore a need for an effective cleaning device and method to address this problem.

Disclosure of utility model

The utility model aims to provide a cleaning device of a rotary drum grating filter, which aims to solve the problem that blockage is easy to occur in the prior art.

In order to solve the technical problems, the utility model provides a cleaning device of a rotary drum grating filter, which comprises a roller screen, a collecting hopper, a hairbrush, an air injection mechanism and a water injection mechanism, wherein the roller screen is of a rotation controllable structure, the collecting hopper is arranged in a space surrounded by the roller screen, a collecting opening of the collecting hopper is upwards arranged, the hairbrush is abutted to the upper part of the roller screen, the air injection mechanism and the water injection mechanism are arranged above the roller screen, and the air injection mechanism and the water injection mechanism are aligned to the upper part of the roller screen.

In one embodiment, a water inlet cavity and a water outlet cavity are formed in the cleaning device of the rotary drum grating filter, an arc-shaped water guide opening is formed by hollowing the side wall of the water inlet cavity from top to bottom, the water guide opening is communicated with the water inlet cavity and the water outlet cavity, the rotary drum screen is arranged in the water outlet cavity, the water inlet side of the rotary drum screen is communicated with the water guide opening, and the lowest position of the inner cavity of the rotary drum screen is located below the arc-shaped lowest position of the water guide opening.

In one embodiment, a water level sensor is arranged in the water inlet cavity, the rotary drum grating filter cleaning device is provided with a variable frequency motor, the variable frequency motor is in transmission connection with the roller screen, and the variable frequency motor is used for adjusting the rotating speed of the roller screen according to the detection result of the water level sensor.

In one embodiment, the lowest position of the inner chamber of the roller screen is at least 5cm below the lowest position of the water guide.

In one embodiment, a plurality of pulleys are arranged in the cleaning device of the rotary drum grating filter, the roller screen is supported on the pulleys, and the roller screen is in rolling abutting connection with the pulleys.

In one embodiment, the brush is arranged in a space surrounded by the roller screen, the brush is arranged along the axial extension of the roller screen, and the brush is abutted with the upper part in the roller screen.

In one embodiment, the plurality of air nozzles of the air injection mechanism are arranged along the axial extension of the roller screen, and the plurality of water nozzles of the water injection mechanism are arranged along the axial extension of the roller screen.

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

In one embodiment, the mesh aperture of the roller screen is 0.15 mm-1 mm.

The beneficial effects of the utility model are as follows:

Firstly, through fixing the brush below the surface of the roller screen, and the brush contacts with the roller screen, for example, the brush is perpendicular to the roller screen, when the pollutant intercepted by the roller screen passes through the brush, the pollutant can be subjected to friction force opposite to the rotation direction of the roller screen, so that accumulated sludge is intercepted, and meanwhile, the sludge on the roller screen is loosened and easily falls off. So that the brush plays a role of loosening and scraping off the trapped matters on the surface of the roller screen.

Then, the air injection mechanism can be composed of an air compressor and an air injection port, and the air compressor generates air and blows the air to the surface of the roller screen through the narrow air injection port. It should be noted that the air jets should be directed toward the surface of the drum screen and the collection hopper, and that an air knife with pressure will blow the sludge on the surface of the drum screen toward the collection hopper.

Finally, the water spraying mechanism is installed in the same way as the air spraying mechanism as a cleaning mode with a stronger cleaning effect after air flushing. The source of hot water can use filtered water, and the filtered water is heated by an electric heating plate or a heating plate and other elements and then forms pressurized water columns or atomized liquid drops after passing through a narrow nozzle, so that viscous substances such as grease and the like which are difficult to clean by air flushing are eluted.

During operation, the three components should work simultaneously, as their respective actions complement each other. The brush has the function of preventing the adhesion of large particles and fibers, and can also loosen the mud formed on the drum screen, so that the dirt is convenient to blow off and elute, and therefore, the brush is required to be before air flushing and water flushing. The air blast can play a role in blowing off, and fine sand residues and fibers on the rotary screen are blown off. After air flushing, the heated filtered water is further used for water flushing, so that the flushing effect is improved, and the roller screen can be quickly restored to a cleaning state.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a structure provided by an embodiment of the present utility model;

FIG. 2 is a schematic side elevational view of FIG. 1;

Fig. 3 is a partial schematic structure of fig. 1.

The reference numerals are as follows:

10. Roller screen mesh, 11, screen mesh frame, 12, screen mesh, 13, fixing plate, 14, annular frame, 15, pinion, 16, variable frequency motor, 17, water level sensor, 18, pulley;

20. a collection bucket;

30. A brush;

40. 41, air nozzles, 42, air pipes;

50. A water spraying mechanism; 51, a water spray nozzle, 52, a water storage tank, 53 and a heater;

61. The water inlet cavity, 62, the water outlet cavity, 63, the water guide port, 64, the water inlet, 65 and the water outlet.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

The utility model provides a cleaning device of a rotary drum grating filter, which is implemented by the cleaning device shown in fig. 1-3, and comprises a roller screen 10, a collecting hopper 20, a hairbrush 30, an air injection mechanism 40 and a water injection mechanism 50, wherein the roller screen 10 is of a rotation controllable structure, the collecting hopper 20 is arranged in a space surrounded by the roller screen 10, a collecting opening of the collecting hopper 20 is upwards arranged, the hairbrush 30 is abutted to the upper part of the roller screen 10, the air injection mechanism 40 and the water injection mechanism 50 are arranged above the roller screen 10, and the air injection mechanism 40 and the water injection mechanism 50 are aligned to the upper part of the roller screen 10.

The drum screen 10 may be made of stainless steel or fiber, the former has higher strength and corrosion resistance, and the latter can form a thicker filter membrane, and the drum screen 10 may be conveniently disassembled due to strain deformation after long-term use of the drum screen 10, so that the requirement of disassembly and replacement should be considered.

In addition, in this example, the mesh diameter of the drum screen 10 is set to 0.15mm to 1mm, and in this range, a part of the poorly soluble organic solid can be trapped. Generally, a screen with smaller aperture can form a filter membrane faster, and the overflow capacity of the screen with large aperture is stronger, so when the solid retention rate is required to reach the treatment effect similar to a sedimentation tank, the aperture is recommended to be 0.15-0.5 mm, and when the requirement on the solid retention rate is not high, the aperture can be increased, and the overflow capacity is improved.

Further, as shown in fig. 1, 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, the right end is an annular frame 14, and the formed roller screen 10 can be meshed with a pinion 15 extending into the outer frame wall of the device and driven by a variable frequency motor 16 to rotate. Wherein, the variable frequency motor 16 can realize the regulation and control of the rotation speed of the roller screen 10.

As shown in fig. 1 and 2, the cleaning device of the rotary drum grating filter is provided with a water inlet cavity 61 and a water outlet cavity 62, the side wall of the water inlet cavity 61 is hollowed from top to bottom to form a water guide port 63, the water guide port 63 is communicated with the water inlet cavity 61 and the water outlet cavity 62, the roller screen 10 is arranged in the water outlet cavity 62, one port of the roller screen 10 is communicated with the water guide port 63, and the lowest position of the port of the roller screen 10 is arranged below the lowest position of the water guide port 63.

When the drum grating filters, the wastewater enters the water inlet cavity 61 through the water inlet 64, and when the water level is higher than the lowest arc position of the water guide port 63, the wastewater passes through the drum screen 10, reaches the water outlet cavity 62, and flows out from the water outlet 65. Wherein the water guide port 63 is in a circular arc form with low middle and high two sides, and the edge of the roller screen 10 is mutually jointed with the upper side of the water guide port 63 through additionally arranging an arc-shaped plate, so that the inflow water is ensured not to flow out from the joint gap under the normal water level. When the water level of the inlet water is too high, sewage can flow out from two sides of the water guide port 63 as a measure for coping with the inlet water flow exceeding the processing load of the rotary drum screen.

As shown in fig. 1, the water inlet cavity 61 is provided with a water level sensor 17, the rotary drum grating filter cleaning device is provided with a variable frequency motor 16, the variable frequency motor 16 is in transmission connection with the roller screen 10, and the variable frequency motor 16 is used for adjusting the rotating speed of the roller screen 10 according to the detection result of the water level sensor 17.

As shown in fig. 1 and 2, this embodiment sets the lowest position of the port of the drum screen 10 to be at least 5cm below the lowest position of the water guide port 63.

Since sewage passes through the drum screen 10 with a liquid level difference upstream and downstream as a driving force, the filtering driving force should not be less than 5cm, otherwise it is easy to cause a small treatment flow rate. It should be noted that when the liquid level of the water inlet chamber 61 is over the highest position of the upstream water guide 63, the cleaning strength or the rotational speed of the drum screen 10 should be increased to avoid the overflow phenomenon.

As shown in fig. 1, the cleaning device of the rotary drum grating filter is provided with a plurality of pulleys 18, the roller screen 10 is supported on the pulleys 18, and the roller screen 10 is in rolling contact with the pulleys 18, so that the roller screen 10 is ensured not to deviate.

As shown in fig. 2, this embodiment provides that the brush 30 is provided in a space enclosed by the drum screen 10, the brush 30 is arranged to extend in the axial direction of the drum screen 10, and the brush 30 abuts against an upper portion in the drum screen 10.

As shown in fig. 2 and 3, this embodiment provides a plurality of air nozzles 41 of the air jetting mechanism 40 arranged along the axial extension of the drum screen 10, and a plurality of water nozzles 51 of the water jetting mechanism 50 arranged along the axial extension of the drum screen 10.

As shown in fig. 2, this embodiment provides for the brush 30, air jet mechanism 40, and water jet mechanism 50 to be sequenced along the cleaning line of the roller screen 10.

Specifically, the brush 30 is disposed inside the drum screen 10, the air injection mechanism 40 is disposed outside the drum screen 10, and the air injection port should be closely attached to the drum screen 10, and the air injection mechanism 40 should precede the water injection mechanism 50. The air injection mechanism 40 and the water injection mechanism 50 should be close to the drum screen 10, and the spray direction is directed toward the collecting hopper 20, because the close proximity to the drum screen 10 can increase the cleaning effect.

The flushing water quantity of the nozzle can be 5-20L/(m.min), and the flushing water quantity is particularly based on the running condition and the treatment requirement of the roller screen 10. The flow rate of water can be 1 to 5 percent of the flow rate of water inlet, and the pressure of water column should be 0.5 to 2bar. The pressure of the compressed air should not be less than 0.5bar.

The specific application process of this embodiment is as follows:

After passing through the roller screen 10, a portion of the particulate contaminants are captured, and the filtered water passes through the roller screen 10 downstream. Part of the trapped contaminants are carried over the collection hopper 20, which is commensurate with the width of the roller screen 10, as the roller screen 10 rotates.

When the sludge trapped by the drum screen 10 passes through the brush 30 fixed above the collecting hopper 20, some small particles of material and fibers are trapped by the resistance of the brush 30 and fall into the collecting hopper 20. The collecting hopper 20 can be V-shaped, the bottom of the collecting hopper is an arc-shaped pipeline, and the collecting hopper can be integrally made into an arc shape. The bottom can be provided with a certain gradient to help the granular sludge to enter the slag hole and be discharged.

Wherein the bristle density of the brush 30 should be somewhat dense and ensure uniform distribution, and the bristles need to be somewhat stiff and should not be too soft, the material should be resistant to corrosion and abrasion, such as polybutyl ester or nylon 610. The angle and height of the brush 30 should be such that the bristle ends have the largest contact area with the drum screen 10, and should not be too long or too short, and a suitable length may be 5 to 15cm, too long may easily cause bristle deformation, and too short may cause bristle wear and increase drum screen 10 wear.

Further, as the roller screen 10 passes under the air jet mechanism 40 after passing through the brush 30, loose sludge and trapped small particles fall under gas scouring into the lower collection hopper 20. The pressure of the air jets should be sufficiently high and the air jet mechanism 40 should be close to the roller screen 10 to ensure that the roller screen 10 is maintained clean. The pressure of the air ram should not be less than 50kPa and the distance from the cylinder screen 10 should not exceed 10cm.

Wherein the air injection mechanism 40 is arranged with the same width as the roller screen 10, and consists of an air nozzle 41 and an air pipe 42, and the air injection direction is directed to the collecting hopper 20. The air distribution mode of the air injection mechanism 40 may be to distribute air by using a plurality of air nozzles 41 with narrow openings, or may be to use an air knife with openings which span small long slits of the roller screen 10, so that the air can be uniformly distributed to the whole roller screen 10. The width of the pores can be 1-4 mm, and the narrower the pores, the more easily enough air pressure is generated, and the pressure applied to the roller screen 10 is increased.

After the air impingement, the roller screen 10 is also subjected to a final step of water impingement. The water spraying mechanism 50 generates hot water by heating devices such as a water storage tank 52, a heater 53 and the like, the heater 53 can use an electric heating tube or a heating plate, the source of the hot water can be filtered water, the temperature of the hot water is 30-70 ℃, and the temperature of the water outlet is preferably 50 ℃ after heating. The water pump pumps water and sprays pressurized water columns or mist through the water nozzles 51 toward the drum screen 10. In practical application, the water nozzle 51 may be replaced by a slit, a water distribution tank, or the like for distributing water. The width of the slit may be 1-4 mm, and in practical application, the water flow may have a stronger water pressure by reducing the opening size of the water nozzle 51, so as to improve the cleaning capability.

As shown in fig. 1, the device should be provided with a water level sensor 17 at the water inlet. The rotational speed of the drum screen 10 is controlled by detecting a change in the feed water level. By increasing the rotational speed, the cylinder screen 10 is caused to undergo cleaning more frequently when the liquid level increases, which increases the throughput of the cylinder screen 10. When the liquid level is reduced, the rotational speed is reduced, and the overflow time and the overflow load of the roller screen 10 are increased, so that the roller screen 10 forms a good filter membrane before being cleaned, and the interception effect of particulate matters and organic matters during filtration is improved. Through tests, the removal rate is better when the hydraulic load is 100m/h, and the screen rotation speed is higher when the hydraulic load is too high, so that the operation energy consumption is increased. Meanwhile, when the cleaning force is increased, the screen mesh can be cleaner, so that the device can run at a lower rotating speed. According to the test, the rotation speed of the drum screen 10 is preferably 1 to 3 rpm.

After brushing, air flushing and water flushing, the drum screen 10 can quickly recover the optimal overflow flux, the sludge and liquid mixed liquor can be flushed away along with the collecting hopper 20, the solid content of the sludge is mainly influenced by the flushing water quantity, the solid content of the sludge can be obviously improved by reducing flushing water or adding a screw press, according to tests, the solid content can reach 20% at the highest when the screw press is not added, and the volatile solid content can reach 80%. The higher content of insoluble organic matters and lower water content lead the retentate to have good fermentation potential.

The high solid and organic removal rate in the primary treatment is helpful to reduce the energy consumption and the occupied area of the secondary wastewater treatment process after the primary treatment and the whole wastewater treatment plant. By using the cleaning method, the micro-sieve can be operated more stably. Through experiments, when the urban sewage is treated by using a screen with the diameter of 0.35mm, and the upstream-downstream water level difference is 20cm and a good filter membrane is formed, the suspended particle removal rate of about 50% and the organic matter removal rate of 30% can be realized. The screen throughput can be maintained at about 100m ³/(m² h) at this removal rate.

While the filter as described above may be used for primary treatment of wastewater upstream of the membrane bioreactor. The primary sludge can be directly or indirectly subjected to anaerobic digestion treatment. In these applications, microsieves may also be used to treat activated sludge or other biologically treated sludge, either entirely or mixed with untreated sewage. In theory, operation in a state where the filter pad is formed may improve removal of fine particles, thereby improving energy efficiency of the wastewater treatment plant.

While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, such changes and modifications are also intended to be within the scope of the utility model.

Claims (9)

1. A cleaning device of a rotary drum grating filter is characterized in that,

Comprises a roller screen, a collecting hopper, a brush, an air injection mechanism and a water injection mechanism;

The roller screen is of a rotation controllable structure;

The collecting hopper is arranged in the space surrounded by the roller screen mesh, and the collecting opening of the collecting hopper is upwards arranged;

the brush is abutted with the upper part of the roller screen;

The air injection mechanism and the water spraying mechanism are arranged above the roller screen, and the air injection mechanism and the water spraying mechanism are aligned to the upper part of the roller screen.

2. The drum grille filter cleaning apparatus of claim 1 wherein,

A water inlet cavity and a water outlet cavity are arranged in the cleaning device of the rotary drum grating filter;

The side wall of the water inlet cavity is hollowed from top to bottom to form an arc water guide port, and the water guide port is communicated with the water inlet cavity and the water outlet cavity;

The roller screen is arranged in the water outlet cavity, the water inlet side of the roller screen is communicated with the water guide opening, and the lowest position of the inner cavity of the roller screen is positioned below the arc-shaped lowest position of the water guide opening.

3. The drum grille filter cleaning apparatus of claim 2 wherein,

A water level sensor is arranged in the water inlet cavity;

The drum grille filter cleaning device is provided with a variable frequency motor, the variable frequency motor is in transmission connection with the drum screen, and the variable frequency motor is used for adjusting the rotating speed of the drum screen according to the detection result of the water level sensor.

4. A drum grille filter cleaning apparatus as set forth in claim 3, wherein,

The lowest position of the inner cavity of the roller screen is at least 5cm below the lowest position of the water guide opening.

5. The drum grille filter cleaning apparatus of claim 1 wherein,

The inside a plurality of pulleys that are equipped with of rotary drum grille filter cleaning device, the cylinder screen cloth bearing is in a plurality of on the pulley, cylinder screen cloth with a plurality of pulley roll butt.

6. The drum grille filter cleaning apparatus of claim 1 wherein,

The brush is arranged in a space surrounded by the roller screen, the brush is arranged along the axial extension of the roller screen, and the brush is abutted with the upper part in the roller screen.

7. The drum grille filter cleaning apparatus of claim 1 wherein,

The air nozzles of the air injection mechanism are arranged along the axial extension of the roller screen;

The plurality of water spray nozzles of the water spray mechanism are arranged along the axial extension of the roller screen.

8. The drum grille filter cleaning apparatus of claim 1 wherein,

The hairbrush, the air injection mechanism and the water injection mechanism are arranged in sequence along the cleaning line of the roller screen.

9. The drum grille filter cleaning apparatus of claim 1 wherein,

The mesh aperture of the roller screen is 0.15 mm-1 mm.