In-vivo cleaning double-chamber floating bed and cleaning method

Abstract

The present invention relates to the technical field of floating beds, specifically a dual-chamber floating bed for internal cleaning and a cleaning method. The floating bed comprises a housing, wherein an upper porous plate, a middle porous plate, and a lower porous plate are provided within the housing. The upper, middle, and lower porous plates divide the interior of the housing into an upper resin chamber and a lower resin chamber. The upper resin chamber comprises an upper resin layer and an upper grease layer, while the lower resin chamber comprises a lower resin layer and a lower grease layer. The bottom plate of the housing is connected to a cleaning water inlet pipe and also includes a grease layer pressing pipe. An upper resin outlet is provided on the side wall of the upper resin chamber, and a lower resin outlet is provided on the side wall of the lower resin chamber. Both the upper and lower resin outlets are connected to the grease layer pressing pipe. The distance between the upper porous plate and the maximum expansion height position of the upper resin layer and the distance between the middle porous plate and the maximum expansion height position of the lower resin layer are 60-70 cm. The distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate are 20-25 cm. Direct internal cleaning is efficient and easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of floating beds, in particular to an in vivo cleaning double-chamber floating bed and a cleaning method. Background Art

[0002] The floating bed is a countercurrent regenerating ion exchanger. The floating bed water treatment process not only shares the advantages of conventional countercurrent regeneration processes, but also boasts high flow rates, reduced stratification during regeneration, ease of operation, and compact size. Consequently, it is gaining increasing attention. The floating bed water treatment process is applicable not only to sodium ion exchange softening treatment but also to chemical desalination using anion and cation exchange. In recent years, my country has also developed and applied the floating bed process to automatically regenerating ion exchangers, achieving promising results.

[0003] The operation of the floating bed is a process of alternating cycles between the operation and regeneration of the resin layer (also known as the bed layer). In the operating state, the inlet water enters the floating bed from the bottom, passes through the lower distribution device, and evenly enters the resin layer. The rising water flow floats the entire resin layer upward to the top in a dense state (called bed formation). At the same time, the water completes the ion exchange reaction during the upward flow and is led out of the body through the upper distribution device. When the resin layer fails, the resin layer is allowed to fall freely as a whole (called falling bed) by draining or stopping the water inlet, and the floating bed is then put into the out-of-service state. During regeneration, the regeneration liquid enters from the top, passes through the upper distribution device, and evenly flows through the resin layer from top to bottom for regeneration. Then, qualified water is used to continue cleaning from top to bottom until the water outlet is qualified.

[0004] To ensure the water production capacity and effluent quality of the dual-chamber floating bed, the resin must be backwashed to remove powdered and broken resin. This backwash is usually performed in vitro, where the resin in the upper and lower chambers is unloaded into a resin washing tower for backwashing. This backwashing method presents the following technical issues:

[0005] 1. The degreasing process takes 40 minutes, the backwashing time is 2 hours, and the resin unloading time is 40 minutes. The whole process is about 4 hours, which is time-consuming and inefficient.

[0006] 2. As the broken resin is easy to block the net in the cleaning tower, the broken resin from backwashing needs to be discharged from the exhaust pipe at the top of the cleaning tower. As the exhaust pipe is at a high position, a large flow of backwash water is required to flush it to the exhaust pipe for discharge. Generally, the backwash flow rate needs to reach 150m 3 / h, the entire backwash process uses more than 400 tons of water from the decation bed, which consumes a lot of water and wastes water resources seriously.

[0007] 3. Because the outlet of the exhaust pipe of the cleaning tower is located in the ditch, the operator needs to constantly lie in the ditch to take samples to determine whether the backwash is qualified, which is labor-intensive; and it requires highly experienced backwash operators to determine whether the backwash is qualified, which places high demands on the backwash operator.

[0008] 4. The valve is opened and closed many times during the entire operation. Each time it is opened and closed, it is necessary to judge whether the valve is opened normally, and no mistakes can be made. The backwash process requires experience to judge the backwash situation and valve opening, which makes the operation extremely difficult. Summary of the Invention

[0009] The present invention aims to provide a dual-chamber floating bed for internal cleaning and a cleaning method thereof, so as to solve the problems of inconvenient operation and low efficiency of existing cleaning methods.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] An in-vivo cleaning double-chamber floating bed comprises a shell, wherein an upper porous plate, a middle porous plate and a lower porous plate are arranged in the shell, the upper porous plate, the middle porous plate and the lower porous plate dividing the interior of the shell into an upper resin chamber and a lower resin chamber, the upper resin chamber is provided with an upper resin layer and an upper grease pressing layer, the lower resin chamber is provided with a lower resin layer and a lower grease pressing layer, the bottom plate of the shell is connected to a cleaning water inlet pipe and also comprises a grease pressing pipe, an upper resin outlet is provided on the side wall of the upper resin chamber, a lower resin outlet is provided on the side wall of the lower resin chamber, both the upper resin outlet and the lower resin outlet are connected to the grease pressing pipe, the distance between the upper porous plate and the maximum expansion height position of the upper resin layer and the distance between the middle porous plate and the maximum expansion height position of the lower resin layer are 60-70 cm; the distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate are 20-25 cm.

[0012] The principles of this solution are:

[0013] Cleaning fluid enters the housing through the cleaning water inlet pipe until it fills the housing. The cleaning fluid then passes through the upper and / or lower resin layers, removing the powdered and crushed resin within them. The fluid then drains into the grease pressing pipe through the upper and / or lower resin outlets, where it is finally discharged, completing the cleaning process. In actual operation, the upper or lower resin chamber can be cleaned separately, or both can be cleaned simultaneously. Use the corresponding resin outlets to drain the water.

[0014] The beneficial effects of this program are:

[0015] 1. This solution directly cleans the resin in the floating bed. Compared with transferring the resin to the outside of the body for cleaning, it eliminates the need for transferring the resin out and back, greatly reduces manual labor, improves the cleaning effect of the resin, and also eliminates the need for external cleaning equipment, saving equipment costs. In addition, it avoids the loss of intact resin during the transfer process and avoids resin waste.

[0016] 2. This solution places the upper resin outlet (lower resin outlet) at a distance of 20-25 cm from the upper porous plate (middle porous plate). This ensures the cleaning effect of the broken resin while effectively avoiding the problem of the complete resin being discharged.

[0017] 3. This solution places the upper resin outlet (lower resin outlet) at a distance of 20-25 cm from the upper porous plate (middle porous plate). The height of the entire equipment is suitable for the internal space of the shell, which saves equipment consumables and construction costs. At the same time, the excessive height of the equipment will not cause the occurrence of flow deviation during operation, thereby ensuring the water production effect.

[0018] Furthermore, the distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate are 20-23 cm.

[0019] Beneficial effect: This solution can also achieve better cleaning effect and prevent complete resin discharge.

[0020] Furthermore, the distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate was 23 cm.

[0021] Beneficial effect: When this solution is adopted, the cleaning effect is the best.

[0022] Furthermore, the distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate was 20 cm.

[0023] Beneficial effect: When this solution is adopted, the effect of avoiding complete resin discharge is best.

[0024] Furthermore, the thickness of the upper fat pressing layer and the lower fat pressing layer is 10-15 cm.

[0025] Beneficial effect: The thickness of the upper and lower fat pressing layers is set to 10-15 cm, which can not only ensure a good fat pressing effect and avoid the resin layer clogging the porous plate, but also save the material cost of the fat pressing layer.

[0026] Furthermore, the thickness of the upper fat pressing layer and the lower fat pressing layer is 15 cm.

[0027] Beneficial effects: When this solution is adopted, the economic benefits are the best.

[0028] Furthermore, the upper pressure fat layer and the lower pressure fat layer are made of columnar white ball resin.

[0029] Beneficial effects: The columnar white ball resin has better compressive strength than the round resin and is not easy to deform. It can prevent the white ball resin from being pressed into the gap of the porous plate due to deformation, ensuring smooth internal cleaning.

[0030] Furthermore, a sight glass is installed on the shell, and the sight glass is arranged on one side of the grease pressing tube.

[0031] Beneficial effects: The sight glass is used to observe the cleaning status of the resin, and it is also convenient to observe the operation and regeneration status.

[0032] The present invention also provides an internal cleaning method, which uses the above-mentioned internal cleaning double-chamber floating bed, comprising the following steps:

[0033] (1) Compacting the upper resin layer and / or the lower resin layer: the cleaning liquid enters the shell from the cleaning water inlet pipe and exhausts until the cleaning liquid fills the shell and the upper resin layer and / or the lower resin layer are compacted;

[0034] (2) Cleaning the powdered resin: Open the upper resin outlet and / or the lower resin outlet, and the powdered resin enters the grease pressing pipe through the upper resin outlet and / or the lower resin outlet for 1 to 2 hours to complete the cleaning of the powdered resin;

[0035] (3) Cleaning the crushed resin: Keep the upper resin outlet and / or the lower resin outlet open for 1 to 2 hours, and the crushed resin enters the grease pressing pipe through the upper resin outlet and / or the lower resin outlet, completing the cleaning of the crushed resin.

[0036] Furthermore, the cleaning liquid pressure is 0.35-0.40 MPa, and the flow rate of the cleaning liquid in step (1) is controlled at 3 m 3 / h; the flow rate of the grease pipe in step (2) is not more than 5m 3 / h; the flow rate of the grease pipe in step (3) is not greater than 8m 3 / h.

[0037] Beneficial effect: The pressure and flow rate of the cleaning liquid are controlled within the scope of this solution, which is convenient for exhausting the shell and will not affect the upper resin layer, the lower resin layer, the upper grease layer and the lower grease layer; the flow rate of the grease tube in step (2) and step (3) is controlled within the scope of this solution. Under the premise of ensuring the cleaning effect of the powdered resin and the crushed resin, it can avoid the complete resin from being discharged, thereby protecting the complete resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of a double-chamber floating bed in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following is further described in detail through specific implementation methods:

[0040] The figure marks in the drawings of the specification include: shell 1, upper porous plate 2, upper resin chamber 3, middle porous plate 4, lower resin chamber 5, lower porous plate 6, cleaning water inlet pipe 7, upper resin outlet 8, upper resin inlet 9, lower resin outlet 10, lower resin inlet 11, grease pressing pipe 12, upper grease pressing layer 13, upper resin layer 14, lower grease pressing layer 15, lower resin layer 16, exhaust pipe 17.

[0041] Example 1

[0042] like Figure 1 As shown, a dual-chamber floating bed for internal cleaning comprises a shell 1, within which an upper porous plate 2, a middle porous plate 4, and a lower porous plate 6 are horizontally fixed by bolts. These plates divide the interior of the shell 1 into an upper resin chamber 3 and a lower resin chamber 5. The upper resin chamber 3 is lined with an upper resin layer 14 and an upper grease layer 13, with the upper grease layer 13 located on the surface of the upper resin layer 14. The lower resin chamber 5 is lined with a lower resin layer 16 and a lower grease layer 15, with the lower grease layer 15 located on the surface of the lower resin layer 16. Both the upper and lower grease layers 13 and 15 are made of columnar white sphere resin and have a thickness of 15 cm.

[0043] The bottom plate of the housing 1 is connected to a cleaning water inlet pipe 7, which is equipped with a valve. The top of the housing 1 is connected to an exhaust pipe 17, which is also equipped with a valve. A grease pressing pipe 12 is also included, and a sight glass (not shown) is installed on the housing 1, located on one side of the grease pressing pipe 12. An upper resin outlet 8 and an upper resin inlet 9 are formed on the sidewall of the upper resin chamber 3, and a lower resin outlet 10 and a lower resin inlet 11 are formed on the sidewall of the lower resin chamber 5. The upper resin outlet 8, upper resin inlet 9, lower resin outlet 10, and lower resin inlet 11 are all connected to the grease pressing pipe 12, and valves are installed on these connected pipes. The distance between the upper porous plate and the maximum expansion height of the upper resin layer, and the distance between the middle porous plate and the maximum expansion height of the lower resin layer, is 65 cm. The distance between the top of the upper resin outlet and the upper porous plate, and the distance between the top of the lower resin outlet and the middle porous plate, is 23 cm.

[0044] An internal cleaning method employs the aforementioned dual-chamber floating bed for internal cleaning. In actual operation, the lower resin chamber 5 or the upper resin chamber 3 can be cleaned individually, or both can be cleaned simultaneously. When cleaning the lower resin chamber 5 alone, the valves on the pipeline connecting the upper resin outlet 8, the upper resin inlet 9, and the lower resin inlet 11 are closed, and the cleaning liquid is discharged from the lower resin outlet 10. When cleaning the upper resin chamber 3 alone, the valves on the pipeline connecting the lower resin outlet 10, the lower resin inlet 11, and the upper resin inlet 9 are closed, and the cleaning liquid is discharged from the upper resin outlet 8.

[0045] This embodiment takes the cleaning of the lower resin chamber 5 alone as an example, and specifically includes the following steps:

[0046] (1) Compact the lower resin layer 15: The cleaning liquid enters the shell 1 from the cleaning water inlet pipe 7, and the flow rate is controlled at 3m 3 / h, open the valve on the exhaust pipe 17 to exhaust, close the valve after exhaust is completed, the cleaning liquid fills the shell 1, and the lower resin layer 15 is compacted;

[0047] (2) Cleaning powdered resin: Close the valves of the grease pressing pipe 12 connected to the lower resin inlet 11, the upper resin outlet 8 and the upper resin inlet 9, slightly open the valve of the grease pressing pipe 12 connected to the lower resin outlet 10, and control the flow rate at 4.5m 3 / h, for 1.5 hours, the powdered resin enters the grease pressing pipe 12 through the lower resin outlet 10 and is discharged through the grease pressing pipe 12, completing the cleaning of the powdered resin;

[0048] (3) Cleaning the crushed resin: After the powder resin is cleaned, continue to keep the grease pressing pipe 12 connected to the lower resin outlet 10 open for 1.5 hours, and control the flow rate at 7m 3 / h, the crushed resin enters the grease pressing pipe 12 through the lower resin outlet 10 and is discharged, completing the cleaning of the crushed resin.

[0049] This embodiment performs cleaning inside the double-chamber floating bed. Compared with the external cleaning in the prior art, the transfer out and transfer back of the resin layer is omitted, with fewer steps, convenient operation, high cleaning efficiency and low cost. At the same time, it also avoids the loss of the resin layer caused by transfer out and transfer back.

[0050] In this embodiment, the distance between the upper porous plate and the maximum expansion height position of the upper resin layer and the distance between the middle porous plate and the maximum expansion height position of the lower resin layer are 65 cm. The upper resin outlet 8 (lower resin outlet 10) is set at 22 cm away from the upper porous plate 2 (middle porous plate 4). This not only ensures that the powdered resin and broken resin can be fully cleaned out, ensuring the cleaning effect, but also effectively prevents the intact resin in the resin layer from being taken away.

[0051] Example 2

[0052] The difference between this embodiment and embodiment 1 is that the distance between the upper resin outlet 8 and the upper porous plate 2 and the distance between the lower resin outlet 10 and the middle porous plate 4 are both 20 cm.

[0053] Example 3

[0054] The difference between this embodiment and embodiment 1 is that the distance between the upper resin outlet 8 and the upper porous plate 2 and the distance between the lower resin outlet 10 and the middle porous plate 4 are both 25 cm.

[0055] The difference between Comparative Example 1 and Example 1 is that the distance between the upper resin outlet 8 and the upper porous plate 2 and the distance between the lower resin outlet 10 and the middle porous plate 4 are both 18 cm.

[0056] Comparative Example 2

[0057] The difference between Comparative Example 2 and Example 1 is that the distance between the upper resin outlet 8 and the upper porous plate 2 and the distance between the lower resin outlet 10 and the middle porous plate 4 are both 30 cm.

[0058] The amounts of powdered resin, crushed resin, intact resin and white ball resin carried in the cleaning liquid discharged from the medium-pressure grease pipe in Examples 1-3 and Comparative Examples 1-2 were respectively tested. The test results are shown in the following table:

[0059] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Complete resin content 0.3‰ 0.2‰ 0.5‰ 0.3‰ 1.0‰ Broken resin content 6.0‰ 5.6‰ 5.0‰ 5.8‰ 4.3‰ Powder resin content 4.0‰ 3.6‰ 3.0‰ 3.8‰ 2.4‰ White ball resin content none none none 0.1‰ none

[0060] Note: 1. Mass ratio; 2. Comparison with the total amount of the upper resin layer / lower resin layer in the floating bed; 3. The upper resin layer / lower resin layer uses D301FC macroporous weakly basic styrene anion exchange resin.

[0061] It can be seen from the above table:

[0062] 1. Comparative Example 1 contains white ball resin, which should be avoided during cleaning.

[0063] 2. The content of powdered resin and broken resin discharged in Examples 1 to 3 is significantly greater than that of broken resin in Comparative Example 2. Among them, the content of powdered resin and broken resin in Example 1 is the highest. This shows that when the upper resin outlet 8 (lower resin outlet 10) is located 20-25 cm away from the upper porous plate 2 (middle porous plate 4), the cleaning effect of powdered resin and broken resin is good. Among them, the effect is best when the upper resin outlet 8 (lower resin outlet 10) is located 23 cm away from the upper porous plate 2 (middle porous plate 4).

[0064] 2. The content of the intact resin discharged in Examples 1 to 3 is significantly lower than that in Comparative Example 2, wherein the content of the intact resin in Example 2 is the lowest. This indicates that when the upper resin outlet 8 (lower resin outlet 10) is located 20-25 cm away from the upper porous plate 2 (middle porous plate 4), the complete resin can be effectively prevented from being discharged. The best effect is achieved when the upper resin outlet 8 (lower resin outlet 10) is located 20 cm away from the upper porous plate 2 (middle porous plate 4).

[0065] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A dual-chamber floating bed for internal cleaning, comprising a housing, an upper porous plate, a middle porous plate, and a lower porous plate disposed within the housing, the upper porous plate, the middle porous plate, and the lower porous plate dividing the interior of the housing into an upper resin chamber and a lower resin chamber, the upper resin chamber containing an upper resin layer and an upper grease layer, and the lower resin chamber containing a lower resin layer and a lower grease layer, characterized in that: The bottom plate of the shell is connected to a cleaning water inlet pipe and also includes a grease pressing pipe. An upper resin outlet is opened on the side wall of the upper resin chamber, and a lower resin outlet is opened on the side wall of the lower resin chamber. Both the upper resin outlet and the lower resin outlet are connected to the grease pressing pipe. The distance between the upper porous plate and the maximum expansion height position of the upper resin layer and the distance between the middle porous plate and the maximum expansion height position of the lower resin layer are 60-70 cm; the distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate are 20-25 cm; the upper grease pressing layer and the lower grease pressing layer use columnar white ball resin.

2. The dual-chamber floating bed for internal cleaning according to claim 1, characterized in that: The distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate are 20-23 cm.

3. The dual-chamber floating bed for internal cleaning according to claim 2, characterized in that: The distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate was 23 cm.

4. The dual-chamber floating bed for internal cleaning according to claim 2, characterized in that: The distance between the top of the upper resin outlet and the upper porous plate and the distance between the top of the lower resin outlet and the middle porous plate was 20 cm.

5. The dual-chamber floating bed for internal cleaning according to any one of claims 1 to 4, characterized in that: The thickness of the upper fat pressing layer and the lower fat pressing layer is 10-15 cm.

6. The dual-chamber floating bed for internal cleaning according to claim 5, characterized in that: The thickness of the upper fat pressing layer and the lower fat pressing layer is 15 cm.

7. The dual-chamber floating bed for internal cleaning according to claim 6, characterized in that: A sight glass is installed on the shell body and is arranged on one side of the grease pressing pipe.

8. An in vivo cleaning method, characterized in that: The method of using the dual-chamber floating bed for internal cleaning according to claim 7 comprises the following steps: (1) Compacting the upper resin layer and / or the lower resin layer: the cleaning liquid enters the shell from the cleaning water inlet pipe and exhausts until the cleaning liquid fills the shell and the upper resin layer and / or the lower resin layer are compacted; (2) Cleaning the powdered resin: Open the upper resin outlet and / or the lower resin outlet, and the powdered resin enters the grease pressing pipe through the upper resin outlet and / or the lower resin outlet for 1 to 2 hours to complete the cleaning of the powdered resin; (3) Cleaning the crushed resin: Keep the upper resin outlet and / or the lower resin outlet open for 1 to 2 hours, and the crushed resin enters the grease pressing pipe through the upper resin outlet and / or the lower resin outlet to complete the cleaning of the crushed resin; the cleaning liquid pressure is 0.35 to 0.40 MPa, and the flow rate of the cleaning liquid in step (1) is controlled at 3m 3 / h; the flow rate of the medium-pressure grease pipe in step (2) is not greater than 5m 3 / h; the flow rate of the medium-pressure grease pipe in step (3) is not greater than 8m 3 / h.

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