Segmented modular serialized screening device

Abstract

The invention belongs to the technical field of sewage and sludge treatment, and particularly relates to a sectionable modular serialized classifier which is provided with a water inlet tank, an inlet and a sludge outlet, and a screening system, a cleaning system, an effluent collecting system and an impurity collecting system are arranged in the classifier. The screening system comprises an upper-layer screen frame and a lower-layer screen frame, filter screens are arranged in the upper-layer screen frame and the lower-layer screen frame, and the cleaning system comprises a cleaning assembly used for washing the upper-layer screen frame and the lower-layer screen frame and a triggering system used for triggering the cleaning assembly to start; the sectionable modular systematized screening device can meet the requirement for higher screening precision, the aperture of the screen mesh can be adjusted according to the requirement, and the sectionable modular systematized screening device has high impact load resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, in particular to a modular serialized screener with segmented screen apertures. Background Art

[0002] At present, the influent sand content of urban sewage treatment plants in some parts of China is higher than the design value. In order to save carbon sources, some sewage treatment plants have eliminated primary sedimentation tanks. At the same time, the widely used cyclone grit chambers are designed to remove sand particles larger than 200μm. However, in actual operation, it is difficult to achieve the designed treatment capacity. The fine sand (particle size ≤ 200μm) that can be partially removed in the pretreatment stage enters the subsequent biochemical treatment system in large quantities, which has many adverse effects on the normal operation of the sewage treatment system after the grit chamber. The high sand content in the sludge can easily cause the sludge pipeline to be clogged by large amounts of sediment, and the accumulation of sand at the bottom of the sludge storage tank reduces the effective volume, increases dewatering costs, makes the operation of the mixing equipment of the sludge digester difficult, and reduces gas production. Once sand and silt accumulate, it will significantly affect the sewage treatment efficiency, increase aeration energy consumption, reduce the effective volume of the biochemical reaction tank, reduce oxygen transfer efficiency, and affect the stable compliance of ammonia nitrogen and total nitrogen standards.

[0003] To address the difficulty in removing impurities from sewage and sludge, an invention patent with announcement number CN102951778B discloses an impurity separation device based on the principle of a semicircular reciprocating swing screening. The main features of this device are its ability to withstand large changes in sludge and impurity concentrations and its strong resistance to concentration shock loads.

[0004] However, the screening accuracy of the above patent cannot reach 200μm, and it cannot effectively remove fine mud and sand (particle size ≤ 200μm), and its ability to resist water and mud impact loads is poor.

[0005] To this end, the present invention provides a modular serialized screener with segmented screen apertures. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: the present invention provides a segmented modular serialized screener, the screener is provided with a water inlet trough, the water inlet trough is provided with an inlet port, and the screener is provided with a mud outlet;

[0008] The interior of the screener is equipped with a screening system, a cleaning system, a water collection system and an impurity collection system;

[0009] The screening system includes an upper screen frame and a lower screen frame, and filter screens are provided inside the upper and lower screen frames;

[0010] The cleaning system includes a cleaning component for flushing the upper screen frame and the lower screen frame and a trigger system for triggering the start of the cleaning component;

[0011] The water collection system includes a water collection tank arranged below the upper screen frame and the lower screen frame;

[0012] The impurity collection system includes a power assembly, a slag outlet arranged below the lower screen frame, and a mud box arranged inside the screener. The slag outlet and the mud box are connected by an inclined plate.

[0013] The filter is composed of multiple sections of screen with gradually increasing apertures.

[0014] The number of water collection tanks is the same as the number of screen segments. A liquid level monitoring system is provided on the water collection tank to control the start of the cleaning system by increasing the liquid level.

[0015] There is a flow meter inside the screener to prevent a sudden increase in water inflow from causing the liquid level to rise and falsely trigger the cleaning system.

[0016] The trigger system comprises a near-infrared moisture meter, a microwave resonance moisture meter and a swing component for swinging an upper screen frame and a lower screen frame.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention describes a segmented modular serialized screener, which modularizes the screener. Any screener includes a single-segment or multi-segment screen, and any screener includes a modular screening system and a complete system required for the operation and maintenance of the screener, including a matching effluent collection system, a cleaning system, and a screen residue collection system. This feature enables the present invention to have a small footprint and support two or more serialized units with different screen apertures to be connected in series to meet higher screening accuracy requirements, while making it convenient to add units. Compared with previous impurity screening systems, the segmented modular systematic screener of the present invention can meet higher screening accuracy requirements, adjust the screen aperture according to requirements, and has a higher ability to resist impact loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 Schematic diagram of the sifter of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the water inlet tank in the present invention;

[0022] Figure 3 is a schematic diagram of the screening system of the present invention;

[0023] Figure 4It is a structural schematic diagram of the water spray pipe in the present invention.

[0024] In the figure: 1. Inlet; 2. Water inlet trough; 3. Power motor; 4. Connecting rod; 5. Upper screen frame; 6. Water collecting trough; 7. Lower screen frame; 8. Impurity collection box; 9. Slag outlet; 10. Mud outlet; 11. Water spray pipe; 12. Pulley drive; 13. Screening system. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] The embodiment of the present invention is a segmented modular serialized screener, the screener is provided with a water inlet trough 2, the water inlet trough 2 is provided with an inlet port 1, and the screener is provided with a mud outlet 10;

[0027] The interior of the screener is provided with a screening system 13, a cleaning system, a water collection system and an impurity collection system.

[0028] The screening system 13 includes an upper screen frame 5 and a lower screen frame 7. Filters are provided inside the upper screen frame 5 and the lower screen frame 7. The screening system 13 also includes a power motor 3, a connecting rod 4 and a flexible connection structure.

[0029] The cleaning system includes a cleaning component for flushing the upper screen frame 5 and the lower screen frame 7, and a trigger system and a pulley drive 12 for triggering the start of the cleaning component. The cleaning system includes a high-pressure water inlet, a high-pressure flushing water pump connected to the high-pressure water inlet pipe, and several water spray pipes 11 arranged on the high-pressure water inlet pipe. Each water spray pipe 11 is respectively provided with a high-pressure nozzle.

[0030] The water collection system includes a water collection tank 6 arranged below the upper screen frame 5 and the lower screen frame 7;

[0031] The impurity collection system includes a power component, a slag outlet 9 arranged below the lower screen frame 7, and an impurity collection box 8 arranged inside the screen. The slag outlet 9 and the impurity collection box 8 are connected by an inclined plate. The power component is composed of a transmission motor and a conveying device.

[0032] The filter is composed of multiple sections of screen with gradually increasing apertures.

[0033] The pore size range of the screen in the screening system 13 of the present invention is 0.025mm~2mm, among which 200μm, 100μm and 50μm are commonly used screen pore sizes. The specific screen pore size can be determined according to the water inlet characteristics, project requirements, etc. Under normal circumstances, the screen in the screening system 13 is a single section.

[0034] When the water volume fluctuates greatly or the screening accuracy requirement is high, the single-layer screen can be divided into multiple sections, and the aperture increases step by step to play different roles.

[0035] The function of the first section of screen is to separate impurities. The purpose of adding the second section of screen with larger aperture is to increase the water flow to cope with water volume fluctuations and avoid the moisture content of the screen residue being too high. The third section of screen can also be added to further dehydrate the screen material and reduce the moisture content of the screen residue.

[0036] When the screen in the screening system 13 is multi-stage, the effluent collected by the first section of the sump 6 in the effluent collection system is directly discharged into the subsequent processing structure, and the effluent collected by the second section of the sump 6 flows back to the screen inlet.

[0037] When the screen in the screening system 13 is multi-section, the length of the first section is the same as that of the single section, and the length of the second and third sections can be set as needed according to the actual water inflow, or set to 50% of the length of the first section.

[0038] There are many ways to connect the segmented screens, such as hot melting, ultrasonic, chemical bonding, sewing, etc., as long as it can ensure that the screening residue can move normally towards the slag outlet during the swinging process of the screen.

[0039] The number of the water collecting tanks 6 is the same as the number of the screen segments. The water collecting tanks 6 are provided with a liquid level monitoring system for controlling the start-up of the cleaning system by increasing the liquid level.

[0040] The effluent collection system of the present invention is configured to set the water collecting troughs 6 in sections according to the segmentation of the screen in the screening system 13, so as to collect the effluent in sections.

[0041] The second section of the water collection tank 6 in the multi-section water collection tank 6 of the water collection system is provided with a liquid level monitoring system. When the liquid level rises further, the cleaning system is automatically guided to trigger cleaning.

[0042] The trigger system includes a near-infrared moisture meter, a microwave resonant moisture meter and a swinging assembly for swinging the upper screen frame 5 and the lower screen frame 7. There is a flow meter inside the screener to prevent a sudden increase in water intake from causing the liquid level to rise and erroneously trigger the cleaning system.

[0043] The cleaning system of the present invention has multiple triggering modes;

[0044] Liquid level triggering: When the liquid level monitoring system of the second section sump 6 of the effluent collection system detects that the liquid level is further increased, the cleaning system is triggered.

[0045] In addition, in order to prevent the cleaning system from being mistakenly triggered due to the increase in the water tank liquid level caused by the sudden increase in water inlet to the screener, a flow meter is installed in the water inlet system of the screener. When the water inlet flow suddenly increases and the water tank liquid level rises, the cleaning system will not be triggered.

[0046] Time trigger: After a certain time interval, the cleaning system is triggered by the time controller.

[0047] Screens moisture content trigger: The screens moisture content is monitored by a moisture meter. When the moisture content reaches the preset value, the cleaning system is triggered.

[0048] The cleaning system of the present invention can perform cleaning at regular intervals, and the cleaning intensity, cleaning angle and cleaning duration can be controlled.

[0049] The means of implementing flushing include but are not limited to: timed cleaning through a time controller, adjusting the flushing intensity by controlling the inlet pressure of the flushing water pipeline, achieving variable angle flushing through a rotatable nozzle, and controlling the duration of the flushing through a time controller.

[0050] The impurity collection system in the present invention also includes a screenings monitoring system. The near-infrared moisture meter is used to measure the moisture content on the screenings surface. Its working method is to intermittently emit near-infrared light waves of reference wavelength and measurement wavelength. The pulses of reference light and measurement light pass through the filter alternately. Two time-sequential light energy pulses will be focused on the screenings and then reflected back to a detector. The reflected infrared light beam is inversely proportional to the water molecule content, and the water molecule content is indirectly reflected by the change in near-infrared energy.

[0051] The microwave resonant moisture meter is used to measure the average moisture content of all materials in the screenings within a magnetic field. The working method is that the transmitting probe below the moisture meter emits microwaves, which generate phase difference and amplitude attenuation through the screenings and are collected by the receiving probe above. The moisture content of the screenings is measured through the linear relationship between the phase difference and damping attenuation and the moisture content of the material.

[0052] The probe of the moisture meter is installed above the screw conveyor of the screening residue. The near-infrared or microwave resonant probe sends the corresponding near-infrared light energy pulse or electromagnetic wave. After passing through the screening residue to be measured, the collector collects the signal and converts it into an electrical signal for processing by the processor to monitor the moisture content of the screening residue in real time.

[0053] When the moisture content of the screenings is monitored to increase, the reciprocating swing frequency of the screen frame is triggered to increase, accelerating the drying of the material on the screen. At the same time, when the moisture content of the screenings reaches the preset value, the screen cleaning system is triggered to flush the screen (the swing frequency of the screen frame is controlled by a frequency converter).

[0054] The present invention is a modular product. Any screener includes a single-stage or multi-stage screen, and any screener includes a modular screening system 13 and a complete system required for the operation and maintenance of the screener, including a matching water collection system, a cleaning system, and a screen residue collection system. This feature makes the present invention occupy a small area and supports two or more serialized units with different screen apertures to be connected in series to meet higher screening accuracy requirements. At the same time, it is convenient to add units and facilitate upgrading and transformation.

[0055] Compared with previous impurity screening systems, the segmented modular system screener of the present invention can meet the needs of higher screening accuracy, adjust the screen aperture according to needs, and has a higher impact load resistance.

[0056] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0058] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A segmentable modular serialized screener, characterized by: The sifter is provided with a water inlet trough (2), the water inlet trough (2) is provided with an inlet port (1), and the sifter is provided with a mud outlet (10); The interior of the sifter is provided with a sifting system (13), a cleaning system, a water collection system and an impurity collection system; The screening system (13) comprises an upper screen frame (5) and a lower screen frame (7), wherein filter screens are provided inside the upper screen frame (5) and the lower screen frame (7); The cleaning system comprises a cleaning component for flushing the upper screen frame (5) and the lower screen frame (7) and a trigger system for triggering the start of the cleaning component; The water collection system includes a water collection tank (6) arranged below the upper screen frame (5) and the lower screen frame (7); The impurity collection system comprises a power assembly, a slag outlet (9) arranged below the lower screen frame (7), and an impurity collection box (8) arranged inside the screen, wherein the slag outlet (9) and the impurity collection box are connected via an inclined plate.

2. A segmented modular serialized screener according to claim 1, characterized in that: The filter screen is composed of a plurality of screen sections with gradually increasing apertures.

3. The segmentable modular serialized screener according to claim 2, characterized in that: The screen is arranged to be multi-section, and the aperture increases step by step, playing different roles. The first section of the screen is used to separate impurities, the second section of the screen with a larger aperture is used to increase the amount of water flowing to cope with water volume fluctuations and avoid excessive moisture content of the screen residue. The third section of the screen with the largest aperture is used to further dehydrate the material on the screen and reduce the moisture content of the screen residue.

4. The segmentable modular serialized screener according to claim 3, characterized in that: The aperture of the sieve is set in the range of 0.02mm to 2mm.

5. The segmentable modular serialized screener according to claim 4, characterized in that: The number of the water collecting troughs (6) is the same as the number of the screen sections.

6. The segmentable modular serialized screener according to claim 5, characterized in that: The water collecting tank (6) is provided with a liquid level monitoring system for controlling the start-up of the cleaning system by increasing the liquid level.

7. The segmentable modular serialized screener according to claim 6, characterized in that: The screener is provided with a flow meter inside to prevent a sudden increase in water inflow from causing the liquid level to rise and erroneously trigger the cleaning system.

8. The segmentable modular serialized screener according to claim 7, characterized in that: The trigger system comprises a near-infrared moisture meter, a microwave resonance moisture meter, and a swing component for swinging an upper screen frame (5) and a lower screen frame (7).

9. A segmented modular serialized screener according to any one of claims 2 to 8, characterized in that: Modularity means that the structures of the upper screen frame (5) and the lower screen frame (7) in the screening system (13) are consistent, and the number of screen frame layers can be flexibly increased or decreased according to the demand for water treatment.

10. A segmented modular serialized screener according to any one of claims 2 to 8, characterized in that: Serialization means that the screen can be used for both sewage treatment and sludge treatment; when used for sewage treatment, the screen can be used as a fine screen, an ultrafine screen or a filter with smaller pore size; when used for sludge treatment, the treatment objects can be primary sludge, activated sludge and coagulation sedimentation sludge.

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