Water inlet and gas distribution device of prefilter

Abstract

A water inlet pipe is arranged on the side wall of a barrel, a U-shaped water baffle is arranged at the position, right opposite to the water inlet pipe, in the barrel, and an opening of the U-shaped water baffle faces the water inlet pipe, so that incoming water flows up and down along the U-shaped water baffle, and the length of the U-shaped water baffle is larger than the diameter of the water inlet pipe; a porous partition plate is fixedly arranged at the lower part in the barrel, a filter element is mounted on the porous partition plate, a lower port of a filter element connecting pipe is flush with the porous partition plate, a maintenance accommodating space is arranged in the barrel close to the water inlet pipe, and no filter element is arranged in the maintenance accommodating space; a water outlet pipe and an air inlet pipe are further arranged at the bottom of the barrel and communicated, and a water baffle is arranged at an inlet of the water outlet pipe. According to the utility model, the water inlet pipe and the U-shaped baffle reduce the potential energy of inlet water and reduce the impact force on the filter element, and the air distribution device and the lower port of the filter element connecting pipe are flush with the porous partition plate, so that compressed air is better distributed, and each filter element can reach the same backwashing strength as much as possible.

Description

Technical Field

[0001] The utility model belongs to the technical field of condensate polishing treatment in chemical water treatment of power plants, and particularly relates to a feed water and gas distribution device for a pre-filter. Background Art

[0002] The existing feed water device and gas distribution device of the condensate polishing pre-filter are complex in structure and cannot play a good role in uniform water replenishment and gas distribution.

[0003] As Figure 1 、 Figure 2 shown, the solid arrows represent the water flow direction and the dashed arrows represent the gas flow direction. The feed water flows upward from the feed pipe to the primary baffle for diversion. A part of it changes to a horizontal flow direction and diffuses around, and the remaining part also becomes a horizontal flow direction and diffuses around after passing through the secondary baffle, and finally flows upward along the equipment cylinder. In fact, the functions of the primary baffle and the secondary baffle are not as desired by people. The feed water can be distributed twice. Structurally, the primary baffle is in a circular ring shape and the secondary baffle is an arc-shaped circular plate. The water flow changes to a horizontal direction completely at the baffle, which scours the root of the filter element severely, causing the filter element to loosen. If the filter element is a wound filter element, it will also damage the filter element.

[0004] The feed water device 11 includes a primary baffle 111, a secondary baffle 112, a fixed round steel 113, fixed bolts 114, and a filter element 4. The filter element connecting pipe 41 is relatively long, about 100 mm long above the porous partition plate 3, with threads at the interface, and the threads are matched with the filter element interface. The lower side of the porous partition plate 3 extends 150 - 200 mm, and small holes are opened at the connection of some filter element connecting pipes and the porous partition plate 3 for ventilation.

[0005] As Figure 3 shown, the gas distribution device is in the form of an annular main pipe 71 + branch pipes 72. During the backwashing with compressed air, it enters from the annular main pipe into 4 branch pipes and then into the cylinder body. After the air flow first fills the space between the lower port of the filter element connecting pipe and the porous partition plate upward, it enters from the filter element connecting pipe to backwash the filter element.

[0006] The feed water device is fixed with bolts for the purpose of maintenance. In fact, no matter which part inside the equipment is to be maintained, all the filter elements must be removed completely so that personnel can enter for maintenance. And the feed water device fixed with bolts itself will not be damaged and does not affect the maintenance of other places, so it can be directly welded and fixed. Otherwise, it will not only increase the assembly difficulty but also make no sense.

[0007] When the filter element pipe leaks out of the lower part of the porous partition, the compressed air must first fill the space between the lower port of the filter element pipe and the porous partition, and then enter from the filter element pipe to backwash the filter element. This leads to a problem. The filter element pipe must be installed extremely horizontally, otherwise the compressed air will definitely short-circuit from some filter element pipes with higher interfaces for backwashing, and other filter elements will not get air backwashing or the backwashing intensity will be insufficient. This has nothing to do with how the compressed air enters the equipment. Therefore, this annular main pipe + branch pipe air distribution form is meaningless except that it wastes materials and is not conducive to equipment layout.

[0008] In addition, since the filter element pipe leaks out of the lower part of the porous partition, the dissolved gas in the water will accumulate here when the equipment is running. A large amount of air will also accumulate here after the equipment is backwashed. Even if there are small ventilation holes at the root of individual filter element pipes, it is inevitable that the accumulated gas will greatly interfere with the water flow when the equipment is running, causing vibration of the filter element and the equipment, which will cause the filter element to loosen or be damaged over time.

[0009] In order to save materials, the pre-filter generally does not have a large manhole or installation hole, and generally uses a DN500 or DN600 manhole. When installing the filter element, the construction personnel enter the equipment to install it, so there is a space of about 500mm in diameter in the center of the equipment to accommodate one person. The filter element is designed to be arranged in this space outside the 500mm diameter.

[0010] Because the professionals did not understand the design concept of the pre-filter that was initially introduced, no one questioned the equipment structure, nor did they conduct reasonable calculations and designs, and no changes were made in equipment manufacturing, resulting in waste of equipment manufacturing materials, and time-consuming, labor-intensive and particularly inconvenient equipment installation and maintenance.

[0011] In fact, as long as you understand that the function of the pre-filter water inlet device is to reduce the potential energy of the inlet water and reduce the impact on the filter element, as long as this function is met, the function of the air distribution device is to better distribute the compressed air naturally and try to make each filter element reach the backwash intensity for backwashing. Utility Model Content

[0012] In view of the above problems existing in the prior art, the utility model provides a pre-filter water inlet and air distribution device.

[0013] The object of the present utility model is achieved in the following manner: a pre-filter water inlet and air distribution device, an inlet pipe is arranged on the side wall of the cylinder body, a U-shaped water baffle is arranged in the cylinder body opposite to the inlet pipe, the opening of the U-shaped water baffle faces the inlet pipe, so that the incoming water flows up and down along the U-shaped water baffle, and the length of the U-shaped water baffle is greater than the diameter of the inlet pipe; a porous partition is fixedly arranged at the lower part in the cylinder body, a filter element is installed on the porous partition, the lower port of the filter element connecting pipe is flush with the porous partition, a maintenance accommodation space is arranged in the cylinder body near the inlet pipe, and no filter element is arranged in the maintenance accommodation space; a water outlet pipe and an air inlet pipe are also arranged at the bottom of the cylinder body, the water outlet pipe is communicated with the air inlet pipe, and a water baffle is arranged at the inlet of the water outlet pipe.

[0014] The U-shaped water baffle is welded to the cylinder wall, the upper edge of the U-shaped water baffle is 200 - 250 mm higher than the top of the inlet pipe, and the lower edge is 300 - 400 mm lower than the bottom of the inlet pipe.

[0015] The maintenance accommodation space and the U-shaped water baffle are in the same vertical space, and both the length and width are 500 - 600 mm.

[0016] The water outlet pipe is arranged at the center position of the lower head of the cylinder body.

[0017] The exhaust pipe is arranged at the center position of the upper head of the cylinder body.

[0018] A manhole is arranged on the side wall of the cylinder body, and the manhole is located above the porous partition and below the inlet pipe.

[0019] Compared with the prior art, the present utility model adopts water inlet from the whole side wall of the cylinder body, and a U-shaped water baffle is arranged opposite to the inlet pipe, which can effectively reduce the potential energy of the incoming water and change the incoming water direction to flow up and down. When the water flow reaches the filter element, the flow rate has been completely reduced, and it will not cause water flow impact on the filter element, nor will it cause the filter element to loosen or damage the filter element.

[0020] The lower port of the filter element connecting pipe is flush with the porous partition, which can ensure that there is no pressure buildup during backwashing with compressed air, and the compressed air immediately enters the filter element for backwashing. At the same time, after the backwashing is completed and during the operation of the equipment, air will not accumulate below the porous partition, protecting the filter element from damage.

[0021] The air inlet pipe is communicated with the water outlet pipe, ensuring that the compressed air is first mixed with the water flow, and after the energy dissipation by the water baffle of the water outlet pipe, it spreads in the range of the lower head of the equipment. The height of the internal space of the upper head is sufficient to keep the air flow and water flow rising stably, and no turbulent flow or swirling flow will be caused.

[0022] The exhaust pipe is located at the highest point of the equipment, which is more conducive to emptying.

[0023] The manhole is arranged on the lower side of the cylinder body. When installing and disassembling the filter element, the construction personnel and the filter element can enter from the side manhole of the equipment. The position of the manhole is relatively low and does not belong to high-altitude operation, providing better safety protection for personnel during construction. Description of the Drawings

[0024] Figure 1 The utility model is a structural schematic diagram of the water inlet device of the pre-filter of the existing condensate polishing treatment.

[0025] Figure 2 It is an enlarged view of the water inlet device of the existing condensate polishing pre-filter.

[0026] Figure 3 The utility model is a structural schematic diagram of an existing condensate polishing pre-filter air distribution device.

[0027] Figure 4 It is a structural schematic diagram of the utility model.

[0028] Figure 5 It is a schematic diagram of the structure of the water inlet device of the utility model. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention, and are not used to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0030] like Figure 4 , Figure 5 As shown, a pre-filter water inlet and air distribution device, a water inlet pipe 1 is arranged on the side wall of the cylinder 10, a U-shaped water baffle 2 is arranged in the cylinder opposite to the water inlet pipe 1, the opening of the U-shaped water baffle 2 faces the water inlet pipe 1, so that the incoming water flows up and down along the U-shaped water baffle 2, and the length of the U-shaped water baffle 2 is greater than the diameter of the water inlet pipe; a porous partition 3 is fixedly arranged in the lower part of the cylinder, a filter element 4 is installed on the porous partition 3, the lower port of the filter element 4 is flush with the porous partition 3, and an inspection and accommodating space 5 is arranged in the cylinder near the water inlet pipe 1, and the filter element 4 is not arranged in the inspection and accommodating space 5; a water outlet pipe 6 and an air inlet pipe 7 are also arranged at the bottom of the cylinder, the water outlet pipe 6 is connected with the air inlet pipe 7, and a water baffle 61 is arranged at the inlet of the water outlet pipe.

[0031] Furthermore, the U-shaped water baffle 2 is welded to the cylinder wall, and the upper edge of the U-shaped water baffle 2 is 200-250mm higher than the top of the water inlet pipe, and the lower edge is 300-400mm lower than the bottom of the water inlet pipe. The upper and lower edges of the U-shaped water baffle 2 exceed the water inlet pipe to ensure that the water flow from the water inlet pipe will not splash from the U-shaped water baffle 2 to the filter element 4, but will be blocked by the U-shaped water baffle 2, effectively reducing the potential energy, and changing the water inlet direction to flow up and down, ensuring that the flow rate has been completely reduced when the water reaches the filter element, and will not cause water flow impact on the filter element, and will not cause the filter element to loosen or damage the filter element.

[0032] Further, the water inlet pipe 1 provided on the side wall of the cylinder body is located in the upper part of the cylinder body. The steel plate material is preferably Q235B lined with rubber or coated with high-temperature paint, and stainless steel plates can also be used for production.

[0033] The lower port of the filter element connecting pipe 41 is flush with the porous partition plate 3, which can ensure that there is no pressure buildup during the backwashing with compressed air, and the compressed air can immediately enter the interior of the filter element 4 for backwashing. At the same time, after the backwashing is completed and during the operation of the equipment, air will not accumulate below the porous partition plate 3, protecting the filter element 4 from damage.

[0034] The air inlet pipe 7 is connected to the water outlet pipe 6. The connection means that they are interconnected through pipes outside the cylinder body and then enter the cylinder body from the same position. The air inlet pipe 7 is connected to the water outlet pipe 6, and a water baffle 61 is provided at the inlet of the water outlet pipe 6 to ensure that the compressed air is mixed with the water first. After the energy dissipation by the water baffle 61 of the water outlet pipe 6, it spreads within the range of the lower head of the equipment. The height of the internal space of the upper head is sufficient to keep the air flow and water flow rising stably, without causing turbulent flow and swirling flow.

[0035] A manhole 8 is provided on the side wall of the cylinder body. The manhole 8 is located above the porous partition plate 3 and below the water inlet pipe 1. When installing and disassembling the filter element, the construction personnel and the filter element enter from the manhole 8 on the side of the cylinder body. The position of the manhole 8 is relatively low and does not belong to high-altitude operation, providing better safety protection for personnel during construction.

[0036] The maintenance accommodation space 5 and the U-shaped water baffle 2 are in the same vertical space. The filter element 4 is installed on the porous partition plate 3. In order to reserve a space for the construction personnel, the filter element is not installed in some areas (i.e., the maintenance accommodation space 5). The maintenance accommodation space 5 is changed from the center of the cylinder body to the edge of the cylinder body and is in the same numerical space as the U-shaped water baffle 2, with a length and width of 500 - 600 mm, ensuring that the construction personnel can turn their bodies freely. Of course, the length and width dimensions can also be adjusted according to the actual working conditions.

[0037] The air inlet pipe 7 and the water outlet pipe 6 are provided at the center position of the lower head of the cylinder body. The water outlet pipe 6 is located at the lowest part of the cylinder body, which is more conducive to emptying; the air inlet pipe 7 is located at the lowest part of the cylinder body, which is more conducive to the compressed air entering each filter element, enabling each filter element to achieve almost the same backwashing intensity and improving the backwashing effect.

[0038] An exhaust pipe 9 is provided at the center position of the upper head of the cylinder body. The exhaust pipe is located at the highest part of the equipment, which is more conducive to emptying.

[0039] The above are only the preferred embodiments of the present invention. It should be noted that for those skilled in the art, without departing from the overall concept of the present invention, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. Prefilter water inlet and air distribution device, characterized in that: A water inlet pipe (1) is arranged on the side wall of the cylinder body, and a U-shaped water baffle (2) is arranged in the cylinder body directly facing the water inlet pipe (1). The opening of the U-shaped water baffle (2) faces the water inlet pipe (1), so that the incoming water flows up and down along the U-shaped water baffle (2). The length of the U-shaped water baffle (2) is greater than the diameter of the water inlet pipe. A porous baffle (3) is fixedly arranged in the lower part of the cylinder body, and a filter element (4) is installed on the porous baffle (3). The lower end of the pipe of the filter element (4) is flush with the porous baffle (3). An inspection and accommodating space (5) is arranged in the cylinder body near the water inlet pipe (1), and no filter element (4) is arranged in the inspection and accommodating space (5). A water outlet pipe (6) and an air inlet pipe (7) are also arranged at the bottom of the cylinder body. The water outlet pipe (6) is connected to the air inlet pipe (7). A water baffle (61) is arranged at the entrance of the water outlet pipe. An exhaust pipe (9) is arranged at the upper end of the cylinder body.

2. The inlet water and gas distribution device of the pre-filter according to claim 1, wherein: The U-shaped water baffle (2) is welded to the cylinder wall. The upper edge of the U-shaped water baffle (2) is 200-250 mm higher than the top of the water inlet pipe, and the lower edge is 300-400 mm lower than the bottom of the water inlet pipe.

3. The inlet water and air distribution device of the pre-filter according to claim 1, characterized in that: The maintenance accommodation space (5) and the U-shaped water retaining plate (2) are in the same vertical space, and both the length and width are 500-600 mm.

4. The inlet water and gas distribution device of the pre-filter according to claim 1, wherein: The water outlet pipe (6) is arranged at the center of the lower end cover of the cylinder.

5. The inlet water and air distribution device of the pre-filter according to claim 1, characterized in that: The exhaust pipe (9) is arranged at the center of the upper end of the cylinder.

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