Condensing device for rectification

Abstract

The utility model discloses a condensing device for rectification, which comprises a rectifying tower, a steam pipe fixedly arranged at the top end of the rectifying tower, a spiral cooling pipe sleeved on the outer side of the bottom end of the steam pipe, a first water inlet pipe fixedly arranged at the bottom end of the spiral cooling pipe, a first water outlet pipe fixedly arranged at the top end of the spiral cooling pipe, and a U-shaped cooling pipe arranged on the inner side of the bottom end of the steam pipe. A second water inlet pipe is fixedly arranged at one end of the U-shaped cooling pipe, a second water outlet pipe is fixedly arranged at the other end of the U-shaped cooling pipe, and the first water inlet pipe, the first water outlet pipe, the second water inlet pipe and the second water outlet pipe are all connected with external circulating cooling water. Cooling water is guided into the spiral cooling pipe through the first water inlet pipe, the spiral cooling pipe rotates and ascends to condense steam in the steam pipe, cooling water is guided into the U-shaped cooling pipe through the second water inlet pipe, the cooling water flows upwards through the U-shaped cooling pipe and then flows downwards to condense steam in the steam pipe, and the interior and the exterior of the steam pipe are cooled at the same time. And the steam condensation efficiency is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of condensation devices, in particular to a condensation device for rectification. Background Art

[0002] N-Methylpyrrolidone, or NMP, is an important chemical raw material. It is a polar solvent with strong selectivity and good stability. It is also a commonly used solvent in the production process of lithium batteries. In the production process of lithium batteries, NMP is often used as a solvent when making positive and negative electrode materials and lithium battery separators. However, when preparing electrode materials, some heavy impurities, metal ions, free amines, etc. will be brought out with the evaporation of the solvent. The purity of the recovered NMP is very low. There are impurities such as absorbent, heavy impurities, metal ions, free amines, etc. in the absorption liquid, so the recovered NMP cannot be directly reused as a solvent.

[0003] A distillation tower is usually used to separate and purify NMP. Existing distillation towers mostly use steam heating to heat the liquid in the tower to achieve distillation. However, the steam is simply condensed through a condenser, and the heat dissipation is slow, which affects the distillation efficiency. Utility Model Content

[0004] Most existing distillation towers adopt steam heating to heat the liquid in the tower to achieve distillation. However, the steam is simply condensed through a condenser, and the heat dissipation is slow, which affects the distillation efficiency. The utility model provides a condensing device for distillation.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a condensing device for distillation, comprising a distillation tower, a steam pipe is fixedly arranged at the top of the distillation tower, a spiral cooling pipe is sleeved on the outer side of the bottom end of the steam pipe, a first water inlet pipe is fixedly arranged at the bottom end of the spiral cooling pipe, a first water outlet pipe is fixedly arranged at the top of the spiral cooling pipe, a U-shaped cooling pipe is arranged on the inner side of the bottom end of the steam pipe, a second water inlet pipe is fixedly arranged at one end of the U-shaped cooling pipe, and a second water outlet pipe is fixedly arranged at the other end of the U-shaped cooling pipe, and the first water inlet pipe, the first water outlet pipe, the second water inlet pipe and the second water outlet pipe are all connected to an external circulating cooling water.

[0006] Preferably, a feed pipe is fixedly provided at the side end of the distillation tower, and a sealing cover is provided at the end of the feed pipe.

[0007] Preferably, a discharge pipe is fixedly provided at the bottom end of the distillation tower, and a solenoid valve is provided in the discharge pipe.

[0008] Preferably, a filter is arranged inside the steam pipe, and the filter comprises a stainless steel mesh layer and an activated carbon layer.

[0009] Preferably, a plurality of fixing rings are fixedly provided on the inner wall of the steam pipe, and the longitudinal sections of the plurality of fixing rings are all arranged obliquely downward from the inner wall of the steam pipe.

[0010] Preferably, the plurality of fixing rings all penetrate the side wall of the steam pipe and extend to the outside of the steam pipe, and the plurality of fixing rings are all made of heat-conducting metal.

[0011] Preferably, a plurality of temperature sensing elements are vertically spaced apart on the side of the distillation tower, and the plurality of temperature sensing elements are all platinum resistors.

[0012] Preferably, a bracket is fixedly provided on the outer wall of the U-shaped cooling pipe, and the bracket is fixed to the inner wall of the steam pipe.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. Cooling water is introduced into the spiral cooling pipe through the first water inlet pipe, and the spiral cooling pipe rotates and rises, and heat exchanges with the steam pipe to condense the steam in the steam pipe. Cooling water is introduced into the U-shaped cooling pipe through the second water inlet pipe, and flows upward through the U-shaped cooling pipe and then flows downward, and heat exchanges with the steam pipe to condense the steam in the steam pipe. By cooling the inside and outside of the steam pipe at the same time, the efficiency of steam condensation is improved.

[0015] 2. The flow rate of steam in the steam pipe is slowed down by multiple fixed rings to increase the cooling time, and the heat is dissipated outward by multiple fixed rings made of heat-conducting metal to accelerate the cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic structural diagram of a cross-section of a steam pipe of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the U-shaped cooling pipe part of the utility model;

[0019] Figure 4 For this utility model Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0020] In the figure: 1. distillation tower; 2. steam pipe; 3. spiral cooling pipe; 4. first water inlet pipe; 5. first water outlet pipe; 6. U-shaped cooling pipe; 7. second water inlet pipe; 8. second water outlet pipe; 9. feed pipe; 10. discharge pipe; 11. filter; 12. fixing ring; 13. temperature sensing element; 14. bracket. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1-4 A condensing device for distillation includes a distillation tower 1, a steam pipe 2 is fixedly arranged at the top of the distillation tower 1, a feed pipe 9 is fixedly arranged at the side end of the distillation tower 1, and a sealing cover is arranged at the end of the feed pipe 9. NMP liquid is added to the distillation tower 1 through the feed pipe 9, and concentrated and purified in the distillation tower 1, and the generated steam enters the steam pipe 2 upward.

[0023] Among them, multiple temperature sensing elements 13 are arranged at intervals in the vertical direction on the side of the distillation tower 1. The multiple temperature sensing elements 13 all use platinum resistors. As the temperature sensing element, the resistance of the platinum resistor increases at a uniform rate as the temperature rises, so as to better detect the temperature at various positions of the distillation tower 1 and monitor the real-time temperature in the distillation tower 1 in real time.

[0024] In addition, a filter 11 is arranged inside the steam pipe 2. The filter 11 includes a stainless steel mesh layer and an activated carbon layer. The steam flowing through the steam pipe 2 is filtered through the filter 11 to remove impurities.

[0025] Furthermore, a spiral cooling pipe 3 is sleeved on the outer side of the bottom end of the steam pipe 2, a first water inlet pipe 4 is fixedly arranged at the bottom end of the spiral cooling pipe 3, a first water outlet pipe 5 is fixedly arranged at the top end of the spiral cooling pipe 3, a U-shaped cooling pipe 6 is arranged on the inner side of the bottom end of the steam pipe 2, a bracket 14 is fixedly arranged on the outer wall of the U-shaped cooling pipe 6, the bracket 14 is fixed to the inner wall of the steam pipe 2, a second water inlet pipe 7 is fixedly arranged at one end of the U-shaped cooling pipe 6, and a second water outlet pipe 8 is fixedly arranged at the other end of the U-shaped cooling pipe 6, the first water inlet pipe 4, the first water outlet pipe 5, the second water inlet pipe 7 and the second water outlet pipe 8 are all connected to the external circulating cooling water.

[0026] Specifically, the first water inlet pipe 4, the first water outlet pipe 5, the second water inlet pipe 7 and the second water outlet pipe 8 are connected to the external circulating cooling water, the cooling water is introduced into the spiral cooling pipe 3 through the first water inlet pipe 4, the spiral cooling pipe 3 rotates and rises, and heat exchanges with the steam pipe 2, so that the steam in the steam pipe 2 is condensed, and the cooling water is introduced into the U-shaped cooling pipe 6 through the second water inlet pipe 7, flows upward through the U-shaped cooling pipe 6 and then flows downward, and heat exchanges with the steam pipe 2, so that the steam in the steam pipe 2 is condensed, and the steam condensation efficiency is improved by cooling the inside and outside of the steam pipe 2 at the same time.

[0027] In addition, a plurality of fixing rings 12 are fixedly arranged on the inner wall of the steam pipe 2, and the longitudinal sections of the plurality of fixing rings 12 are arranged obliquely downward from the inner wall of the steam pipe 2. The plurality of fixing rings 12 all penetrate the side wall of the steam pipe 2 and extend to the outside of the steam pipe 2, and the plurality of fixing rings 12 are all made of heat-conducting metal, and the flow rate of the steam in the steam pipe 2 is slowed down by the plurality of fixing rings 12, thereby increasing the cooling time, and the plurality of fixing rings 12 made of heat-conducting metal are used to dissipate heat outward, thereby accelerating the cooling.

[0028] Finally, a discharge pipe 10 is fixedly provided at the bottom end of the distillation tower 1 , and a solenoid valve is provided in the discharge pipe 10 .

[0029] The operating principle of the utility model is now described as follows: NMP liquid is added to the distillation tower 1 through the feed pipe 9, and is concentrated and purified in the distillation tower 1. The generated steam enters the steam pipe 2 upward, and the steam flowing through the steam pipe 2 is filtered by the filter 11 to remove impurities. The first water inlet pipe 4, the first water outlet pipe 5, the second water inlet pipe 7 and the second water outlet pipe 8 are connected to the external circulating cooling water, and the cooling water is introduced into the spiral cooling pipe 3 through the first water inlet pipe 4. The spiral cooling pipe 3 rotates and rises, and heat exchanges with the steam pipe 2 to condense the steam in the steam pipe 2. The cooling water is introduced into the U-shaped cooling pipe 6 through the second water inlet pipe 7. After flowing upward through the U-shaped cooling pipe 6, it flows downward and exchanges heat with the steam pipe 2 to condense the steam in the steam pipe 2. By cooling the steam pipe 2 simultaneously inside and outside, the efficiency of steam condensation is improved.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A condensing device for distillation, comprising a distillation tower (1), characterized in that: A steam pipe (2) is fixedly arranged at the top of the distillation tower (1); a spiral cooling pipe (3) is sleeved on the outer side of the bottom end of the steam pipe (2); a first water inlet pipe (4) is fixedly arranged at the bottom end of the spiral cooling pipe (3); a first water outlet pipe (5) is fixedly arranged at the top end of the spiral cooling pipe (3); a U-shaped cooling pipe (6) is arranged on the inner side of the bottom end of the steam pipe (2); a second water inlet pipe (7) is fixedly arranged at one end of the U-shaped cooling pipe (6); a second water outlet pipe (8) is fixedly arranged at the other end of the U-shaped cooling pipe (6); the first water inlet pipe (4), the first water outlet pipe (5), the second water inlet pipe (7) and the second water outlet pipe (8) are all connected to external circulating cooling water.

2. A condensing device for rectification according to claim 1, characterized in that: A feed pipe (9) is fixedly arranged at the side end of the distillation tower (1), and a sealing cover is arranged at the end of the feed pipe (9).

3. A condensing device for rectification according to claim 1, characterized in that: A discharge pipe (10) is fixedly arranged at the bottom end of the distillation tower (1), and a solenoid valve is arranged in the discharge pipe (10).

4. A condensing device for rectification according to claim 1, characterized in that: A filter (11) is arranged inside the steam pipe (2), and the filter (11) comprises a stainless steel mesh layer and an activated carbon layer.

5. A condensing device for rectification according to claim 1, characterized in that: A plurality of fixing rings (12) are fixedly arranged on the inner wall of the steam pipe (2), and the longitudinal cross-sections of the plurality of fixing rings (12) are all arranged obliquely downward from the inner wall of the steam pipe (2).

6. A condensing device for rectification according to claim 5, characterized in that: The plurality of fixing rings (12) all penetrate the side wall of the steam pipe (2) and extend to the outside of the steam pipe (2), and the plurality of fixing rings (12) are all made of heat-conducting metal.

7. A condensing device for rectification according to claim 1, characterized in that: A plurality of temperature sensing elements (13) are arranged at intervals in the vertical direction on the side of the distillation tower (1), and the plurality of temperature sensing elements (13) are all platinum resistors.

8. A condensing device for rectification according to claim 1, characterized in that: A bracket (14) is fixedly provided on the outer wall of the U-shaped cooling pipe (6), and the bracket (14) is fixed to the inner wall of the steam pipe (2).

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