Anti-scaling preheater for MVR systems of high COD wastewater

Abstract

This utility model discloses an anti-scaling preheater for a high COD wastewater MVR system, comprising: a U-shaped outer sleeve assembly, an H-shaped intermediate sleeve, and an inner sleeve. The H-shaped intermediate sleeve is concentrically fitted inside the U-shaped outer sleeve assembly, and the inner sleeve is concentrically fitted inside the H-shaped intermediate sleeve. The ends of the H-shaped intermediate sleeve inside the U-shaped outer sleeve assembly are all closed structures. An expansion joint is provided at one end of the U-shaped sleeve assembly, and an ultrasonic descaling device is provided on one side of the upper end of the U-shaped outer sleeve assembly. This utility model has the following advantages: the preheater is modularly designed, allowing multiple sets to be used in series, which is convenient for transportation. The annular material channel formed between the three sleeves makes the material a thin liquid layer, resulting in a high heat transfer coefficient. The hot and cold fluids flow completely in opposite directions, and ultrasonic descaling is achieved. Furthermore, the expansion joint on the U-shaped outer sleeve assembly, which facilitates heat exchange of the material, can effectively prevent damage to the outer sleeve due to thermal expansion and contraction.

Description

Technical Field

[0001] This utility model relates to the technical field of COD wastewater treatment preheaters, specifically to an anti-scaling preheater for high COD wastewater MVR systems. Background Technology

[0002] For treating high-COD wastewater, multi-effect evaporation or mechanical vapor recompression (MVR) evaporation is typically used to achieve wastewater desalination. During the evaporation process, the material needs to exchange heat with the condensate using a heat exchanger to recover system heat, reduce steam consumption, and lower operating costs.

[0003] The main drawbacks of material preheaters currently used in the market are: 1. Shell-and-tube heat exchangers: unable to achieve complete counterflow, resulting in poor heat recovery and high energy consumption; 2. Plate heat exchangers: prone to clogging and requiring frequent cleaning. Therefore, the industry urgently needs a preheating device that is less prone to clogging and has good heat recovery. This paper proposes an anti-scaling preheater for high-COD wastewater MVR systems to address these issues. Utility Model Content

[0004] To address the problems mentioned in the background art, the technical solution adopted by this utility model is: an anti-scaling preheater for a high COD wastewater MVR system, comprising: a U-shaped outer sleeve assembly, an H-shaped intermediate sleeve, and an inner sleeve. The H-shaped intermediate sleeve is concentrically fitted inside the U-shaped outer sleeve assembly, and the inner sleeve is concentrically fitted inside the H-shaped intermediate sleeve. The ends of the H-shaped intermediate sleeve inside the U-shaped outer sleeve assembly are all closed structures. An expansion joint is provided at one end of the U-shaped sleeve assembly, and an ultrasonic descaling device is provided on one side of the upper end of the U-shaped outer sleeve assembly.

[0005] As a preferred technical solution of this utility model, the U-shaped outer sleeve assembly includes an upper outer sleeve, a lower outer sleeve, and a U-shaped pipe seat. The upper outer sleeve and the lower outer sleeve are respectively connected to both ends of the U-shaped pipe seat through flanges, and a drain outlet is provided on one side of the bottom of the lower outer sleeve.

[0006] As a preferred embodiment of this utility model, one end of the upper outer sleeve is connected to a material inlet via a flange, and the lower outer sleeve is connected to a material outlet via a flange at the same end as the material inlet. Expansion joints are installed at the same end of both the upper and lower outer sleeves.

[0007] As a preferred embodiment of this utility model, the H-shaped intermediate sleeve passes through the U-shaped tube seat and extends into the upper outer sleeve, and an outer support spiral plate is provided between the outer side of the end of the H-shaped intermediate sleeve and the inner side of the upper outer sleeve, and the connection between the H-shaped intermediate sleeve and the U-shaped tube seat is a sealed structure.

[0008] As a preferred embodiment of this utility model, the H-shaped intermediate sleeve passes through the U-shaped tube seat and extends into the lower outer sleeve, and an outer support spiral plate is also provided between the outer side of the end of the H-shaped intermediate sleeve and the inner side of the lower outer sleeve.

[0009] As a preferred embodiment of this utility model, an inner support spiral plate is provided between the inner side of the H-shaped intermediate sleeve near the outer support spiral plate and the outer side of the inner sleeve.

[0010] As a preferred embodiment of this utility model, the ultrasonic descaling device is disposed on the top of the upper outer sleeve, the inner sleeve is provided with a hot water outlet at one end of the upper outer side of the H-shaped intermediate sleeve, the inner sleeve is provided with a hot water inlet at one end of the lower outer side of the H-shaped intermediate sleeve, and the connection between the inner sleeve and the H-shaped intermediate sleeve is a sealed structure.

[0011] As a preferred embodiment of this utility model, the inner sleeve is internally connected to the H-shaped intermediate sleeve, the outer diameter of the inner sleeve is smaller than the inner diameter of the H-shaped intermediate sleeve, the outer diameter of the H-shaped intermediate sleeve is smaller than the inner diameters of the upper outer sleeve and the lower outer sleeve, and the upper outer sleeve and the lower outer sleeve have the same diameter.

[0012] This utility model has the following advantages: The preheater of this design is modular and can be used in series in multiple sets, which is convenient for transportation. The annular material channel formed between the three layers of sleeves makes the material a thin liquid layer, resulting in a high heat transfer coefficient. The hot and cold fluids flow completely in opposite directions, resulting in good heat recovery. The flow velocity inside the pipe is high, and ultrasonic descaling makes it difficult for the material to form scale, reducing the number of cleaning cycles. Furthermore, the expansion joint is set on the U-shaped outer sleeve assembly for material heat exchange, which can effectively avoid damage to the pipe body due to thermal expansion and contraction of the outer sleeve. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the preheater according to a preferred embodiment of the present invention;

[0014] Figure 2 This is a bottom view of the preferred embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the connection structure between the H-shaped intermediate sleeve and the inner sleeve in a preferred embodiment of this utility model.

[0016] Explanation of reference numerals in the attached diagram: 1. Material inlet; 2. Material outlet; 3. Upper outer sleeve; 301. Lower outer sleeve; 302. U-shaped pipe seat; 4. Outer support spiral plate; 5. Inner support spiral plate; 6. Ultrasonic descaling device; 7. H-shaped intermediate sleeve; 8. Inner sleeve; 9. Hot water outlet; 10. Hot water inlet; 11. Expansion joint; 12. Drain outlet. Detailed Implementation

[0017] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

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

[0020] Please refer to the following: Figures 1-3 This utility model discloses an anti-scaling preheater for a high-COD wastewater MVR system, comprising: a U-shaped outer sleeve assembly, an H-shaped intermediate sleeve 7, and an inner sleeve 8. The H-shaped intermediate sleeve 7 is concentrically fitted inside the U-shaped outer sleeve assembly, and the inner sleeve 8 is concentrically fitted inside the H-shaped intermediate sleeve 7. The ends of the H-shaped intermediate sleeve 7 inside the U-shaped outer sleeve assembly are all closed structures. An expansion joint 11 is provided at one end of the U-shaped sleeve assembly, and an ultrasonic descaling device 6 is provided on one side of the upper end of the U-shaped outer sleeve assembly. The equipment adopts a three-layer sleeve (U-shaped outer sleeve assembly, H-shaped intermediate sleeve 7, and inner sleeve 8); the three layers of sleeves form an annular material channel, making the material a thin liquid layer. It is connected by flanges and can be disassembled for cleaning. Multiple sets of components can be used in series as needed.

[0021] Combination Figure 2As shown, the U-shaped outer sleeve assembly includes an upper outer sleeve 3, a lower outer sleeve 301, and a U-shaped pipe seat 302. The upper outer sleeve 3 and the lower outer sleeve 301 are respectively connected to both ends of the U-shaped pipe seat 302 via flanges. A drain port 12 is provided on one side of the bottom of the lower outer sleeve 301. One end of the upper outer sleeve 3 is connected to a material inlet 1 via a flange, and the same end of the lower outer sleeve 301 is connected to a material outlet 2 via a flange. Expansion joints 11 are installed at the same end of both the upper outer sleeve 3 and the lower outer sleeve 301. An H-shaped intermediate sleeve 7 passes through the U-shaped pipe. The U-shaped sleeve 7 extends into the upper outer sleeve 3, and an external support spiral plate 4 is provided between the outer side of the end of the H-shaped intermediate sleeve 7 and the inner side of the upper outer sleeve 3. The connection between the H-shaped intermediate sleeve 7 and the U-shaped sleeve seat 302 is a sealed structure. The H-shaped intermediate sleeve 7 passes through the U-shaped sleeve seat 302 and extends into the lower outer sleeve 301, and an external support spiral plate 4 is also provided between the outer side of the end of the H-shaped intermediate sleeve 7 and the inner side of the lower outer sleeve 301. An inner support spiral plate 5 is provided between the inner side of the end of the H-shaped intermediate sleeve 7 closest to the external support spiral plate 4 and the outer side of the inner sleeve 8. Both the external support spiral plate 4 and the inner support spiral plate 5 can ensure that the tubes remain stable and do not shake, while guiding the flow without affecting the normal flow of the solution.

[0022] The ultrasonic descaling device 6 is located at the top of the upper outer sleeve 3. The inner sleeve 8 has a hot water outlet 9 at one end of its upper outer surface of the H-shaped intermediate sleeve 7, and a hot water inlet 10 at one end of its lower outer surface of the H-shaped intermediate sleeve 7. The connection between the inner sleeve 8 and the H-shaped intermediate sleeve 7 is sealed, and the inner sleeve 8 and the H-shaped intermediate sleeve 7 are internally connected. The outer diameter of the inner sleeve 8 is smaller than the inner diameter of the H-shaped intermediate sleeve 7, and the outer diameter of the H-shaped intermediate sleeve 7 is smaller than the inner diameters of the upper outer sleeve 3 and the lower outer sleeve 301. The upper outer sleeve 3 and the lower outer sleeve 301 have the same diameter. This ensures an annular channel between the upper outer sleeve 3 and the H-shaped intermediate sleeve 7, and similarly, an annular channel between the H-shaped intermediate sleeve 7 and the inner sleeve 8.

[0023] Specifically, when this utility model is used, high COD materials first enter through material inlet 1, and then are evenly distributed in the channel between the U-shaped outer sleeve assembly (upper outer sleeve 3, lower outer sleeve 301 and U-shaped tube seat 302) and the H-shaped intermediate sleeve 7. The materials exchange heat with hot water on the surface of the H-shaped intermediate sleeve 7, and finally flow out from material outlet 2.

[0024] Hot water first enters through hot water inlet 10, and when it flows to the end of inner sleeve 8, it flows through the annular channel between inner sleeve 8 and H-shaped intermediate sleeve 7. The material is evenly distributed in the channel between inner sleeve 8 and H-shaped intermediate sleeve 7, and heat exchange occurs with the material on the surface of H-shaped intermediate sleeve 7. Finally, it flows out from hot water outlet 9, and the ultrasonic descaling device 6 is turned on at regular intervals to prevent the material from scaling on the sleeve wall.

[0025] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

[0026] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A scale-preheating device for MVR systems of high COD wastewater, characterized in that, include: The assembly consists of a U-shaped outer sleeve, an H-shaped intermediate sleeve (7), and an inner sleeve (8). The H-shaped intermediate sleeve (7) is concentrically fitted inside the U-shaped outer sleeve assembly, and the inner sleeve (8) is concentrically fitted inside the H-shaped intermediate sleeve (7). The ends of the H-shaped intermediate sleeve (7) inside the U-shaped outer sleeve assembly are all closed structures. An expansion joint (11) is provided at one end of the U-shaped outer sleeve assembly, and an ultrasonic descaling device (6) is provided on one side of the upper end of the U-shaped outer sleeve assembly.

2. The anti-scaling preheater for a high-COD wastewater MVR system as described in claim 1, characterized in that, The U-shaped outer tube assembly includes an upper outer tube (3), a lower outer tube (301), and a U-shaped tube seat (302). The upper outer tube (3) and the lower outer tube (301) are respectively connected to the two ends of the U-shaped tube seat (302) through flanges. A drain outlet (12) is provided on one side of the bottom of the lower outer tube (301).

3. The anti-scaling preheater for a high-COD wastewater MVR system as described in claim 2, characterized in that, The upper outer sleeve (3) is connected to a material inlet (1) via a flange at one end, and the lower outer sleeve (301) is connected to a material outlet (2) via a flange at the same end as the material inlet (1). Expansion joints (11) are installed at the same end of both the upper outer sleeve (3) and the lower outer sleeve (301).

4. The anti-scaling preheater for a high-COD wastewater MVR system as described in claim 1, characterized in that, The H-shaped intermediate sleeve (7) passes through the U-shaped tube seat (302) and extends into the upper outer sleeve (3). An outer support spiral plate (4) is provided between the outer side of the end of the H-shaped intermediate sleeve (7) and the inner side of the upper outer sleeve (3). The connection between the H-shaped intermediate sleeve (7) and the U-shaped tube seat (302) is a sealed structure.

5. The anti-scaling preheater for a high-COD wastewater MVR system as described in claim 1, characterized in that, The H-shaped intermediate sleeve (7) passes through the U-shaped tube seat (302) and extends into the lower outer sleeve (301), and an outer support spiral plate (4) is also provided between the outer side of the end of the H-shaped intermediate sleeve (7) and the inner side of the lower outer sleeve (301).

6. The anti-scaling preheater for a high-COD wastewater MVR system as described in claim 1, characterized in that, An inner support spiral plate (5) is provided between the inner side of the H-shaped intermediate sleeve (7) near the outer support spiral plate (4) and the outer side of the inner sleeve (8).

7. The anti-scaling preheater for a high-COD wastewater MVR system as described in claim 1, characterized in that, The ultrasonic descaling device (6) is located at the top of the upper outer sleeve (3). The inner sleeve (8) is located at the outer end of the upper part of the H-shaped intermediate sleeve (7) and has a hot water outlet (9). The inner sleeve (8) is located at the outer end of the lower part of the H-shaped intermediate sleeve (7) and has a hot water inlet (10). The connection between the inner sleeve (8) and the H-shaped intermediate sleeve (7) is a sealed structure.

8. The anti-scaling preheater for a high-COD wastewater MVR system as described in claim 1, characterized in that, The inner sleeve (8) is internally connected to the H-shaped intermediate sleeve (7). The outer diameter of the inner sleeve (8) is smaller than the inner diameter of the H-shaped intermediate sleeve (7). The outer diameter of the H-shaped intermediate sleeve (7) is smaller than the inner diameter of the upper outer sleeve (3) and the lower outer sleeve (301). The upper outer sleeve (3) and the lower outer sleeve (301) have the same diameter.

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