Membrane grid flushing system

Abstract

According to the technical scheme, the membrane grid flushing system is characterized in that the membrane grid flushing system comprises a grid flushing pipe, and the grid flushing pipe is arranged on one side of the top of a membrane grid and sprays water to the membrane grid for flushing; the grid purging pipe is arranged on one side of the top of the membrane grid and blows air towards the membrane grid, and the position where the grid flushing pipe sprays water and flushes the membrane grid is close to or overlapped with the position where the grid purging pipe blows the membrane grid; through the arrangement of the grid purging pipe, the grid purging pipe can be matched with the grid flushing pipe to achieve gas-water mixed flushing, compared with traditional pressure water flushing, the gas-water mixed flushing can better achieve water atomization, the flushing force is higher, the flushing face and fineness are higher, membrane holes in the membrane grid can be effectively penetrated, and the cleanliness degree of flushing the membrane grid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more particularly to a membrane grid flushing system. Background Art

[0002] Membrane grilles are mainly used as pre-treatment equipment in sewage treatment plants to intercept impurities in the water, especially fibrous impurities in the water. The membrane grille consists of several filter screens tightly connected and fixed on a chain. When the treated water passes through the high-strength filter screen on the surface of the equipment, the solid impurities in the water are retained on the filter screen surface. A conventional pressure nozzle is installed on the upper part of the equipment. The filter screen slowly rotates toward the upper part of the equipment driven by the motor. After backwashing by the nozzle, the impurities at the separation point flow into the backwash water collection tank at the bottom of the filter screen, and then are discharged through the slag cleaning system. Backwashing does not affect the normal filtration.

[0003] Among the prior art, a Chinese utility model patent with authorization announcement number CN219585872U discloses a membrane grille based on the treatment of oily domestic sewage, including an outer frame, an inlet baffle, a filter orifice plate, a drive reducer, a slag trough, a first flushing unit, a second flushing unit, and a reagent dosing unit, wherein the inlet baffle is installed at the water inlet of the membrane grille, a drive reducer is installed on one side of the outer frame, a first flushing port and a second flushing port are provided on one side of the drive reducer, a filter orifice plate is installed inside the outer frame, guide chain links are provided on both sides of the filter orifice plate, and the top of the guide chain link is meshed with the drive gear.

[0004] For the membrane grille in the prior art, backwashing is performed by spraying water through a flushing unit alone. However, when there are a lot of fiber impurities or colloidal attachments in the water, backwashing cannot completely clean the membrane grille, which affects the efficiency of the membrane grille. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a membrane grid flushing system, which, through the setting of a grid purge pipe, can cooperate with the grid flushing pipe to achieve air-water mixed flushing. The air-water mixed flushing can better achieve water atomization than traditional pressure water flushing, has a stronger flushing force, a higher flushing surface and fineness, and can effectively penetrate the membrane holes on the membrane grid, thereby improving the cleanliness of the membrane grid flushing.

[0006] To achieve the above object, the present invention provides the following technical solutions: a membrane grid flushing system, comprising a grid flushing pipe, the grid flushing pipe is arranged on one side of the top of the membrane grid and sprays water toward the membrane grid for flushing; and a grid purge pipe, which is arranged on one side of the top of the membrane grid and sprays air toward the membrane grid. The position where the grid flushing pipe sprays water on the membrane grid is adjacent to or overlaps with the position where the grid purge pipe purges the membrane grid.

[0007] The present invention is further configured as follows: a plurality of air outlet holes are arranged on the side of the grid purge pipe facing the membrane grid, and the air outlet holes are arranged as rectangular holes with a length of 15 cm and a width of 2 mm.

[0008] The present invention is further configured as follows: the distance between two adjacent air outlet holes on the grid purge pipe is set to 10 mm.

[0009] The present invention is further configured as follows: the length direction of the air outlet holes on the grille purge pipe is arranged along the length direction of the grille purge pipe and the multiple air outlet holes on the grille purge pipe are arranged along the length direction thereof.

[0010] The present invention is further configured as follows: the distance between the grid purge pipe and the membrane grid is set to 7 cm.

[0011] The present invention is further configured to include a slag discharge water trough, a plurality of slag discharge water troughs are arranged around the grid plate and surround the slag discharge water trough, and the slag discharge water trough is used to receive impurities cleaned by the grid flushing pipe and the grid purge pipe.

[0012] The present invention is further configured as follows: the membrane grid is arranged in the outer frame, and the grid flushing pipe and the grid purge pipe are both arranged in the outer frame; An exhaust pipe for exhausting excess gas in the outer frame is arranged on the top of the outer frame.

[0013] The present invention is further configured such that: a flange is detachably connected to the top of the exhaust pipe.

[0014] The present invention is further configured as follows: the radius of the grid purge pipe is set to r, Q=V*3.14*r 2 , where Q is the wind volume and V is the wind speed; Q=V*A, where A is the purge area of ​​the grid purge pipe on the membrane grid; Solve the Bernoulli equation for flow velocity, P+1 / 2ρV 2 +ρgh=C, where P is the pressure at a point in the fluid, Ρ is the fluid density, g is the acceleration due to gravity, h is the height of the point, and C is a constant.

[0015] The present invention is further configured as follows: the grille purge pipe is configured as a stainless steel pipe.

[0016] In summary, compared with the prior art, the present invention has the following beneficial effects: the present invention can cooperate with the grille flushing pipe to achieve air-water mixed flushing through the setting of the grille purge pipe, and the air-water mixed flushing can better achieve water atomization than traditional pressure water flushing, and the flushing force is stronger, the flushing surface and fineness are higher, and it can effectively penetrate the membrane holes on the membrane grille, thereby improving the cleanliness of the membrane grille flushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment; Figure 2 The schematic diagram of the slag discharge trough according to the embodiment is shown in FIG.

[0018] In the figure: 1. Grid flushing pipe; 2. Grid purge pipe; 3. Outer frame; 4. Membrane grid; 5. Exhaust pipe; 6. Slag discharge trough. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0020] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0021] Embodiment: A membrane grid flushing system, see attached Figure 1 and attached Figure 2 , including a grid flushing pipe 1 and a grid purge pipe 2, the grid flushing pipe 1 is arranged on one side of the top of the membrane grid 4 and sprays water toward the membrane grid 4 for flushing; the grid purge pipe 2 is arranged on one side of the top of the membrane grid 4 and sprays air toward the membrane grid 4, the position where the grid flushing pipe 1 sprays water to flush the membrane grid 4 is adjacent to or overlaps with the position where the grid purge pipe 2 purges the membrane grid 4.

[0022] When flushing the membrane grid 4, the grid flushing pipe 1 and the grid purge pipe 2 are used simultaneously to achieve air-water mixed flushing of the membrane grid 4. The air-water mixed flushing can better achieve water atomization than traditional pressure water flushing, has stronger flushing force, higher flushing surface and fineness, and can effectively penetrate the membrane holes on the membrane grid 4, thereby improving the cleanliness of flushing the membrane grid 4.

[0023] Specifically, a plurality of air outlets are provided on the side of the grid purge pipe 2 facing the membrane grid 4, and the air outlets are set as rectangular holes with a length of 15 cm and a width of 2 mm. The distance between two adjacent air outlets on the grid purge pipe 2 is set to 10 mm. The length direction of the air outlets on the grid purge pipe 2 is set along the length direction of the grid purge pipe 2, and the plurality of air outlets on the grid purge pipe 2 are arranged along the length direction thereof.

[0024] By experimenting with the shapes of the air outlet holes of various shapes and sizes, it was found that when the air outlet holes of the above shapes and sizes were used and arranged in the above arrangement, the cleanliness of the membrane grid 4 reached the highest level.

[0025] Specifically, the distance between the grid purge pipe 2 and the membrane grid 4 is set to 7 cm. The distance between the grid purge pipe 2 and the membrane grid 4 will directly affect the cleaning effect of the grid purge pipe 2 on the membrane grid 4. After many tests, it is determined that when the distance between the grid purge pipe 2 and the membrane grid 4 is set to 7 cm, the cleaning degree of the membrane grid 4 is the best.

[0026] Specifically, it also includes a slag discharge trough 6, and a plurality of slag discharge troughs 6 are arranged around the grid plate and surround the slag discharge trough 6. The slag discharge trough 6 is used to receive the impurities cleaned by the grid flushing pipe 1 and the grid purge pipe 2.

[0027] The membrane grid 4 is arranged in the outer frame 3 , the grid flushing pipe 1 and the grid purge pipe 2 are both arranged in the outer frame 3 , and one end of the slag discharge trough 6 extends out of the outer frame 3 to discharge the received impurities from the outer frame 3 .

[0028] Specifically, an exhaust pipe 5 for exhausting excess gas in the outer frame 3 is provided at the top of the outer frame 3. Since the grid purge pipe 2 is used, the air pressure in the outer frame 3 will increase. In order to prevent the air pressure from affecting the flow of sewage, the exhaust pipe 5 is provided to exhaust the excess gas from the outer frame 3.

[0029] Specifically, a flange is detachably connected to the top of the exhaust pipe 5 .

[0030] In order to ensure the cleaning effect of the grille purge pipe 2, it is necessary to select a grille purge pipe 2 with a suitable radius. The radius of the grille purge pipe 2 is set to r, Q=V*3.14*r2, where Q is the air volume and V is the wind speed; Q=V*A, where A is the purge area of ​​the grid purge pipe 2 to the membrane grid 4; The flow velocity is solved by the Bernoulli equation, P+1 / 2ρV2+ρgh=C, where P is the pressure at a point in the fluid, P is the fluid density, g is the acceleration due to gravity, h is the height of the point, and C is a constant.

[0031] Specifically, the grid purge pipe 2 is configured as a stainless steel pipe.

[0032] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A membrane grid flushing system, characterized in that: It comprises a grid flushing pipe (1), wherein the grid flushing pipe (1) is arranged on one side of the top of the membrane grid (4) and sprays water toward the membrane grid (4) for flushing; and a grid purge pipe (2), wherein the grid purge pipe (2) is arranged on one side of the top of the membrane grid (4) and sprays water toward the membrane grid (4); the position where the grid flushing pipe (1) sprays water to flush the membrane grid (4) is adjacent to or overlaps with the position where the grid purge pipe (2) purges the membrane grid (4).

2. The membrane grid flushing system according to claim 1, characterized in that: The grid purge pipe (2) is provided with a plurality of air outlet holes on the side facing the membrane grid (4), and the air outlet holes are configured as rectangular holes with a length of 15 cm and a width of 2 mm.

3. The membrane grid flushing system according to claim 2, characterized in that: The distance between two adjacent air outlet holes on the grid purge pipe (2) is set to 10 mm.

4. The membrane grid flushing system according to claim 3, characterized in that: The length direction of the air outlet holes on the grille purge pipe (2) is arranged along the length direction of the grille purge pipe (2), and the plurality of air outlet holes on the grille purge pipe (2) are arranged along the length direction thereof.

5. The membrane grid flushing system according to claim 1, characterized in that: The distance between the grid purge pipe (2) and the membrane grid (4) is set to 7 cm.

6. The membrane grid flushing system according to claim 1, characterized in that: It also comprises a slag discharge water trough (6), a plurality of slag discharge water troughs (6) are arranged around the grid plate and surround the slag discharge water trough (6), and the slag discharge water trough (6) is used to receive impurities cleaned by the grid flushing pipe (1) and the grid purge pipe (2).

7. The membrane grid flushing system according to claim 1, characterized in that: The membrane grid (4) is arranged in the outer frame (3), and the grid flushing pipe (1) and the grid purge pipe (2) are both arranged in the outer frame (3); An exhaust pipe (5) for exhausting excess gas in the outer frame (3) is arranged on the top of the outer frame (3).

8. The membrane grid flushing system according to claim 7, characterized in that: The top of the exhaust pipe (5) is detachably connected with a flange.

9. The membrane grid flushing system according to claim 1, characterized in that: The radius of the grid purge pipe (2) is set to r, Q = V * 3.14 * r2, where Q is the air volume and V is the wind speed; Q=V*A, where A is the purge area of ​​the grid purge pipe (2) on the membrane grid (4); The flow velocity is solved by the Bernoulli equation, P+1 / 2ρV2+ρgh=C, where P is the pressure at a point in the fluid, P is the fluid density, g is the acceleration due to gravity, h is the height of the point, and C is a constant.

10. The membrane grid flushing system according to claim 1, characterized in that: The grid purge pipe (2) is configured as a stainless steel pipe.

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