Large-flow multi-medium filter

Abstract

The utility model discloses a high-flow multi-medium filter, which belongs to the field of boiler make-up water treatment and comprises a filter body. An upper sealing head and a lower sealing head are respectively arranged at the upper section and the lower section of the filter body, a water distribution plate is arranged on the upper sealing head, the water distribution plate is arranged in an arc shape, and a plurality of vertically through holes are uniformly distributed in the water distribution plate; a first packing layer, a second packing layer, a third packing layer, a fourth packing layer and a fifth packing layer are sequentially arranged in the filter body from bottom to top; the water distribution plate effectively guides water flow to be naturally dispersed and evenly distributed on the cross section of the filter, then the water flow sequentially passes through the first filler layer to intercept large-particle suspended solids, the second filler layer and the third filler layer to further filter small particles, then the water flow passes through the fourth filler layer for deep filtration and the fifth filler layer with adsorption performance, and all the layers achieve a synergistic effect. The turbidity is reduced step by step, and the water inlet requirement of a subsequent ultrafiltration device is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the boiler makeup water treatment technical field, concretely relates to a large flow multi -media filter. BACKGROUND

[0002] In the field of boiler makeup water treatment, water sources are mainly surface water, circulating blowdown water and the like, these water sources have complex characteristics and contain numerous impurities, and must be pretreated by means of a filter before entering a rear-end ultrafiltration membrane filter. However, the existing filter on the market has obvious technical defects. On the one hand, the filtering effect is limited, and the turbidity of water cannot be effectively reduced to less than 5 NTU as required by the ultrafiltration membrane, so that the ultrafiltration membrane is easily polluted and blocked during operation, frequent cleaning and replacement of the ultrafiltration membrane not only increase the operation cost, but also seriously affect the stability and continuous operation capacity of the system. On the other hand, the existing filter has a small processing flow, and it is difficult to meet the increasing demand for boiler makeup water. Under the background of continuous expansion of industrial production scale, the current situation of low processing flow has become a key factor restricting the efficiency improvement of the entire boiler makeup water treatment system. Therefore, there is an urgent need for a filter capable of efficiently reducing turbidity and having a large processing flow to solve the current difficulties. SUMMARY

[0003] The utility model aims at providing a large flow multi -media filter to solve the problems of the existing filter that turbidity cannot be reduced to below 5 NTU and small processing flow.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a large flow multi -media filter, comprising a filter body,

[0005] The upper and lower two sections of the filter body are respectively provided with an upper end cover and a lower end cover, the upper end cover is provided with a water distribution plate, the water distribution plate is arranged in an arc shape, and a plurality of upper and lower through holes are uniformly distributed on the water distribution plate;

[0006] The inside of the filter body is sequentially provided from bottom to top with a first filler layer, a second filler layer, a third filler layer, a fourth filler layer and a fifth filler layer, the fillers of the first filler layer, the second filler layer, the third filler layer and the fourth filler layer are quartz sand, and the filler of the fifth filler layer is anthracite.

[0007] Further, the filter body is provided with a discharge port, a sight glass and a manhole, the pipeline diameter of the filter body is 3800mm, and the size of the sight glass is 370mmx160mm.

[0008] Further, the water distribution plate is formed by connecting two half water distribution plates through nuts, and the size of the through holes on the water distribution plate is 22mm.

[0009] 4. The large-flow multi-medium filter according to claim 1, wherein the first filler layer is quartz sand with a particle size of 4-8 mm and a height of 100 mm; the second filler layer is quartz sand with a particle size of 2-4 mm and a height of 100 mm; the third filler layer is quartz sand with a particle size of 1-2 mm and a height of 100 mm; the fourth filler layer is quartz sand with a particle size of 0.5-0.8 mm and a height of 750 mm; and the fifth filler layer is anthracite with a particle size of 0.8-1.0 mm and a height of 400 mm.

[0010] Further, the top of the upper head is provided with a top pipe, and the bottom of the lower head is provided with a bottom pipe.

[0011] Further, the end of the top pipe away from the filter body is provided with a water inlet, a backwashing water outlet and a first sampling port.

[0012] Further, the end of the bottom pipe away from the filter body is provided with a backwashing water inlet, a water outlet, a forward washing water outlet, a compressed air inlet and a second sampling port, and the bottom of the lower head is connected with a suspender.

[0013] Further, pressure gauges are arranged on the top pipe and the bottom pipe.

[0014] Further, the top of the upper head is provided with an exhaust pipe.

[0015] Further, a perforated plate is arranged on the lower head, the perforated plate is located at the bottom of the filter body, and a plurality of water caps are arranged on the perforated plate.

[0016] Compared with the prior art, the filter has the advantages that:

[0017] The water distribution plate is arranged in an arc shape, which can effectively guide the water flow to disperse naturally and uniformly distribute in the cross section of the filter, so as to reduce the impact on the lower filler, and then the water flow passes through the first filler layer to intercept large-particle suspended matters, the second filler layer and the third filler layer to further filter small particles, and then passes through the fourth filler layer for deep filtration and the fifth filler layer with adsorption performance, so that the turbidity is gradually reduced, and finally the treated water reaches turbidity ≤5 NTU, which meets the water inlet requirement of the subsequent ultrafiltration device.

[0018] The filter has the advantages of low cost, low operation cost, simple operation, long service life of the filter material, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a front view of the large-flow multi-medium filter.

[0020] Figure 2 is a sectional view of the filter body 10. Figure 1

[0021] Figure 3 is a schematic diagram of the structure of the filler after filling; Figure 2

[0022] Figure 4 is a bottom view of the filter body 10. Figure 1

[0023] Figure 5 is a schematic diagram of the structure of the position of the porous plate and the supporting column;

[0024] Figure 6 is a schematic diagram of the connection between the water distribution plate and the upper head;

[0025] Figure 7 is a top view of the filter body 10. Figure 6

[0026] In the figure: 10, filter body; 101, discharge port; 102, sight glass; 103, manhole; 10A, first filler layer; 10B, second filler layer; 10C, third filler layer; 10D, fourth filler layer; 10E, fifth filler layer; 110, upper head; 111, exhaust pipe; 112, water distribution plate; 113, lug; 120, lower head; 121, manhole; 122, supporting leg; 123, porous plate; 1231, supporting column; 1232, water cap; 124, water baffle; 125, hanger rod; 20, top pipe; 201, water inlet; 202, backwash drainage port; 203, first sampling port; 30, bottom pipe; 301, backwash water inlet; 302, water production port; 303, forward washing drainage port; 304, compressed air inlet; 305, second sampling port. DETAILED DESCRIPTION

[0027] The present application will be further described below in conjunction with the embodiments.

[0028] The following embodiments are used to illustrate the present application, but cannot be used to limit the protection scope of the present application. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements of the method of the present application under the concept of the present application all belong to the protection scope of the present application.

[0029] Please refer to Figures 1-7 The present application provides a large-flow multi-medium filter, which comprises a filter body 10.

[0030] ​​​​The filter body 10 has a pipe diameter of 3800mm, and is provided with a discharge port 101, two sight glasses 102, and a manhole 103. The filter body 10 has a wall thickness of 14mm and a length of 2000mm. The size of the sight glass is 370mmx160mm.

[0031] The upper and lower sections of the filter body 10 are respectively provided with an upper head 110 and a lower head 120. The wall thickness of the upper head 110 and the lower head 120 is 16mm. The top of the upper head 110 is provided with an exhaust pipe 111. The bottom of the lower head 120 is provided with a lower manhole 121 and four supporting legs 122. The lower head 120 is also provided with a perforated plate 123, which is located at the bottom of the filter body 10. Four 108x12mm welded supporting columns 1231 are arranged between the lower head 120 and the perforated plate 123. The four supporting columns 1231 are located on a circle with a diameter of 1600mm. The lower head 120 is provided with a 500x12mm water baffle 124 to reduce the hydraulic impact on the bottom pipe 30. The perforated plate 123 has a thickness of 30mm. The perforated plate 123 is provided with 600 45mm openings, which are evenly distributed at an interval of 130mm and avoid the supporting columns 1231. The openings in the perforated plate 123 are each provided with a water cap 1232. The wire seam gap of the water cap 1232 is 0.25mm.

[0032] The upper head 110 is installed with a water distribution plate 112 through four ear plates 113. The water distribution plate 112 is arranged in an arc shape. The water distribution plate 112 is evenly provided with 376 22mm openings to ensure uniform water distribution in the upper part. The water distribution plate 112 is formed by connecting two half water distribution plates 112 through nuts.

[0033] The inside of the filter body 10 is sequentially provided with a first filler layer 10A, a second filler layer 10B, a third filler layer 10C, a fourth filler layer 10D, and a fifth filler layer 10E from bottom to top. The first filler layer 10A is 4-8mm particle size quartz sand with a height of 100mm. The second filler layer 10B is 2-4mm particle size quartz sand with a height of 100mm. The third filler layer 10C is 1-2mm particle size quartz sand with a height of 100mm. The fourth filler layer 10D is 0.5-0.8mm particle size quartz sand with a height of 750mm. The fifth filler layer 10E is 0.8-1.0mm particle size anthracite with a height of 400mm.

[0034] The top of the upper head 110 is provided with a top pipe 20, and the bottom of the lower head 120 is provided with a bottom pipe 30.

[0035] The end of the top pipe 20 away from the filter body 10 is provided with a water inlet 201, a backwashing drain 202, and a first sampling port 203.

[0036] The end of the bottom pipeline 30 away from the filter body 10 is provided with a backwash water inlet 301, a water outlet 302, a forward washing water outlet 303, a compressed air inlet 304 and a second sampling port 305; a hanger 125 is arranged between the lower head 120 and the bottom pipeline 30, and the hanger 125 is used to stabilize the bottom pipeline 30.

[0037] The top pipeline 20 and the bottom pipeline 30 are both provided with pressure gauges, so as to monitor the working pressure difference of the multi-medium filter, and the working pressure difference ranges from 0.02 to 0.05 MPa, and when the pressure difference reaches 0.08 MPa, the filler needs to be backwashed.

[0038] Embodiment: The device is applied to the pretreatment of production water of a power plant boiler, and the production water quality indexes are as follows:

[0039]

[0040]

[0041] The pretreatment process is production water→clean water tank→clean water pump→heater→multi-medium filter→self-cleaning filter→ultrafiltration device.

[0042] The specific treatment method of the multi-medium filter is that the production water enters into the filter body 10 from the water inlet 201 and the top pipeline 20.

[0043] The production water passes through the water distribution plate 112 and then passes through the filler layer in sequence; the production water filtered through the filter layer enters into the next treatment process through the water outlet 302 of the bottom pipeline 30.

[0044] The production water treated through the large-flow multi-medium filter has a turbidity of about 2.52 NTU, which meets the turbidity requirement of ≤5 NTU for entering the ultrafiltration device. When the multi-medium filter normally operates, the working pressure difference of the inlet and outlet pipes ranges from 0.02 to 0.05 MPa, and when the pressure difference reaches 0.08 MPa, the filler is backwashed by air and water.

[0045] The multi-medium filter has a long water production cycle of about 10 days, and the treatment capacity is 150 tons / h; the turbidity of the outlet water is low. Since the medium filter has a large water treatment capacity, the investment of the equipment quantity is reduced, and good economic benefits are obtained.

[0046] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high flow multi-media filter characterized by: The filter body (10) is provided with an upper head (110) and a lower head (120) respectively on the upper and lower sections of the filter body (10), the upper head (110) is provided with a water distribution plate (112), the water distribution plate (112) is arranged in an arc shape, and the water distribution plate (112) is uniformly provided with a plurality of upper and lower through holes. The inside of the filter body (10) is sequentially provided with a first filler layer (10A), a second filler layer (10B), a third filler layer (10C), a fourth filler layer (10D) and a fifth filler layer (10E) from bottom to top, the fillers of the first filler layer (10A), the second filler layer (10B), the third filler layer (10C) and the fourth filler layer (10D) are quartz sand, and the filler of the fifth filler layer (10E) is anthracite. The filter body (10) is provided with a discharge port (101), a sight glass (102) and a manhole (103), the pipeline diameter of the filter body (10) is 3800mm, and the size of the sight glass is 370mmx160mm.

2. A high flow multi-media filter according to claim 1, wherein: The water distribution plate (112) is formed by connecting two half water distribution plates (112) through nuts, and the size of the through holes in the water distribution plate (112) is 22mm.

3. A high flow multi-media filter according to claim 1, wherein: The first filler layer (10A) is 4-8mm particle size quartz sand with a height of 100mm, the second filler layer (10B) is 2-4mm particle size quartz sand with a height of 100mm, the third filler layer (10C) is 1-2mm particle size quartz sand with a height of 100mm, the fourth filler layer (10D) is 0.5-0.8mm particle size quartz sand with a height of 750mm, and the fifth filler layer (10E) is 0.8-1.0mm particle size anthracite with a height of 400mm.

4. The large flow multi-media filter of claim 1, wherein: The top of the upper head (110) is provided with a top pipeline (20), and the bottom of the lower head (120) is provided with a bottom pipeline (30).

5. A high flow multi-media filter according to claim 1, wherein: The end of the top pipeline (20) away from the filter body (10) is provided with a water inlet (201), a backwashing water outlet (202) and a first sampling port (203).

6. A high flow multi-media filter according to claim 5, wherein: The end of the bottom pipeline (30) away from the filter body (10) is provided with a backwashing water inlet (301), a water outlet (302), a forward washing water outlet (303), a compressed air inlet (304) and a second sampling port (305), and the bottom of the lower head (120) is connected with a hanging rod (125).

7. A high flow multi-media filter according to claim 5, wherein: Pressure gauges are arranged on the top pipeline (20) and the bottom pipeline (30).

8. A high flow multi-media filter according to claim 5, wherein: The top of the upper head (110) is provided with an exhaust pipe (111).

9. A high flow multi-media filter according to claim 1, wherein: The lower head (120) is further provided with a perforated plate (123), the perforated plate (123) is located at the bottom of the filter body (10), and the perforated plate (123) is provided with a plurality of water caps (1232).

10. A high flow multi-media filter according to claim 1, wherein: ​

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