Tubular falling film evaporator with protective sleeve

Abstract

The utility model relates to evaporator technical field, concretely relates to a tubular falling film evaporator with protective sleeve, the inside of evaporator is equipped with upper baffle, lower baffle and heat exchange pipe, the upper end of upper baffle is liquid inlet cavity, the heat exchange cavity between upper baffle and lower baffle, the lower end of lower baffle is vapor-liquid separation cavity, the upper end of heat exchange pipe is higher than upper baffle, and is communicated with liquid inlet cavity, the lower end of heat exchange pipe is communicated with vapor-liquid separation cavity, the part of heat exchange pipe higher than upper baffle is equipped with protective sleeve, and the inner wall of protective sleeve and the outer wall of heat exchange pipe are equipped with buffer layer, the utility model provides can directly block the high alkali material in liquid inlet cavity and wash the heat exchange pipe tube head, avoids the sealing failure of tube head because of long -term abrasion.

Description

Technical Field

[0001] This utility model relates to the field of evaporator technology, specifically to a tubular falling film evaporator with a protective sleeve. Background Technology

[0002] In industries such as chemical, pharmaceutical, and food processing, tubular falling film evaporators are widely used in solution evaporation and concentration processes due to their advantages such as high heat transfer efficiency and short material residence time. However, when processing highly corrosive materials such as alkalis, the heat exchange tube bundle inside the evaporator is subjected to the dual conditions of high-pressure steam heating and high-alkali material scouring for extended periods, making the tube head connecting to the upper baffle prone to severe wear. This wear can lead to the failure of the sealing structure between the heat exchange tube head and the upper baffle, allowing the high-alkali material in the inlet chamber to directly contact and mix with the steam in the heat exchange chamber. This not only causes a large amount of alkali solution to be lost during the steam condensation process, increasing production costs, but also results in the generated condensate carrying alkali, failing to meet subsequent recycling or discharge standards, seriously affecting the stability and environmental friendliness of the production system. Furthermore, tube head wear significantly shortens the replacement cycle of the heat exchange tube bundle. Frequent equipment maintenance not only increases maintenance costs but also interrupts normal production processes, causing significant economic losses and production disruptions for enterprises. Utility Model Content

[0003] To address the problem of easy wear at the connection between the heat exchange tube sleeve and the upper partition plate in the existing technology, this utility model provides a tubular falling film evaporator with a protective sleeve.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A tubular falling film evaporator with a protective sleeve includes an evaporator. The evaporator's interior is provided with an upper partition, a lower partition, and heat exchange tubes. Above the upper partition is a liquid inlet chamber, between the upper and lower partitions is a heat exchange chamber, and below the lower partition is a vapor-liquid separation chamber. The upper end of the heat exchange tube is higher than the upper partition and communicates with the liquid inlet chamber, while the lower end of the heat exchange tube communicates with the vapor-liquid separation chamber. A protective sleeve is provided on the portion of the heat exchange tube above the upper partition, and a buffer layer is provided between the inner wall of the protective sleeve and the outer wall of the heat exchange tube. The liquid inlet chamber has a liquid inlet and a liquid distribution device. The upper part of the heat exchange chamber is connected to a steam pipe, and the lower part is connected to a condensate pipe, with a waste steam pipe on the condensate pipe. The bottom of the vapor-liquid separation chamber has a liquid outlet, and the upper part of the vapor-liquid separation chamber has a waste steam outlet.

[0006] Furthermore, the liquid distribution device includes a liquid distribution plate and liquid equalization holes. The liquid distribution plate is parallel to the upper partition plate, and the liquid equalization holes are evenly distributed on the liquid distribution plate. The ratio of the diameter of the liquid equalization holes to the inner diameter of the heat exchange tube is 1:3-5.

[0007] Furthermore, the length of the protective sleeve is 2-3 cm longer than the portion of the heat exchange tube that is above the upper partition, and the outer wall of the protective sleeve is provided with reinforcing ribs.

[0008] Furthermore, the steam pipeline is sequentially equipped with a steam filter, a pressure regulating valve, and a flow meter.

[0009] Furthermore, the end of the exhaust steam pipe is connected to an exhaust steam heat exchanger.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] This invention provides a tubular falling film evaporator with a protective sleeve. By installing a protective sleeve at the tube head of the heat exchange tube above the upper baffle, the erosion of the heat exchange tube head by highly alkaline materials in the liquid inlet chamber can be directly blocked. Simultaneously, the buffer layer between the inner wall of the protective sleeve and the outer wall of the heat exchange tube further absorbs the impact energy generated by the material flow, preventing the tube head from failing to seal due to long-term wear. This effectively extends the service life of the heat exchange tube bundle, reduces equipment maintenance frequency and costs, and ensures the continuity of the production process. Furthermore, the effective protection of the tube head by the protective sleeve completely prevents direct contact between highly alkaline materials and steam in the heat exchange chamber. This prevents the loss of alkaline solution during steam condensation, reducing production costs, and ensures that the condensate does not carry alkaline content, meeting subsequent recycling or discharge standards, thus improving resource utilization and environmental friendliness. At the same time, the liquid distribution device in the liquid inlet chamber ensures that the material is evenly distributed to each heat exchange tube. Combined with the reasonable layout of the heat exchange chamber and the vapor-liquid separation chamber, the original high-efficiency heat transfer and vapor-liquid separation performance of the evaporator can be maintained, further ensuring the overall evaporation and concentration efficiency and operational stability of the equipment. Attached Figure Description

[0012] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0013] Figure 1 A schematic diagram of an embodiment of a tubular falling film evaporator with a protective sleeve is shown;

[0014] Attached diagram labels: 1-Evaporator, 2-Upper baffle, 3-Lower baffle, 4-Heat exchange tube, 5-Protective sleeve, 6-Liquid inlet, 7-Steam pipeline, 8-Condensate pipe, 9-Exhaust steam pipe, 10-Liquid outlet, 11-Exhaust steam outlet. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0016] Reference Appendix Figure 1 A tubular falling film evaporator with a protective sleeve includes an evaporator 1. The evaporator 1 has an upper baffle 2, a lower baffle 3, and a heat exchange tube 4 inside. The upper baffle 2 is above a liquid inlet chamber, the space between the upper baffle 2 and the lower baffle 3 is a heat exchange chamber, and the space below the lower baffle 3 is a vapor-liquid separation chamber. The upper end of the heat exchange tube 4 is higher than the upper baffle 2 and communicates with the liquid inlet chamber, while the lower end of the heat exchange tube 4 communicates with the vapor-liquid separation chamber. The portion of the heat exchange tube 4 above the upper baffle 2 is provided with a protective sleeve 5, and a buffer layer is provided between the inner wall of the protective sleeve 5 and the outer wall of the heat exchange tube 4. The liquid inlet chamber has a liquid inlet 6 and a liquid distribution device. The upper part of the heat exchange chamber is connected to a steam pipe 7, and the lower part is connected to a condensate pipe 8. A waste steam pipe 9 is provided on the condensate pipe. The bottom of the vapor-liquid separation chamber has a liquid outlet 10, and the upper part of the vapor-liquid separation chamber has a waste steam outlet 11.

[0017] In one embodiment of the present invention, the liquid distribution device includes a liquid distribution plate and liquid equalization holes. The liquid distribution plate is parallel to the upper partition plate 2, and the liquid equalization holes are evenly distributed on the liquid distribution plate. The ratio of the diameter of the liquid equalization holes to the inner diameter of the heat exchange tube 4 is 1:3-5.

[0018] In one embodiment of this utility model, the length of the protective sleeve 5 is 2-3 cm longer than the portion of the heat exchange tube 4 that is higher than the upper partition plate 2, and the outer wall of the protective sleeve 5 is provided with reinforcing ribs.

[0019] In one embodiment of this utility model, a steam filter, a pressure regulating valve and a flow meter are sequentially provided on the steam pipeline 7.

[0020] In one embodiment of this utility model, the end of the exhaust steam pipe 9 is connected to an exhaust steam heat exchanger.

[0021] In use, a protective sleeve 5 is fitted over the part of the heat exchange tube 3 that is higher than the upper partition 2. Then, the material is introduced through the liquid inlet 6 and steam is introduced through the steam pipe 7. The material flows evenly into the heat exchange tube 3 under the action of the liquid distribution device for heat exchange. The steam and water after heat exchange are discharged through the exhaust steam pipe and the condensate pipe. The material after heat exchange enters the vapor-liquid separation chamber. The liquid is discharged through the liquid outlet 10 and the gas is discharged through the exhaust steam outlet 11.

[0022] This invention provides a tubular falling film evaporator with a protective sleeve. By installing a protective sleeve at the tube head of the heat exchange tube above the upper baffle, the erosion of the heat exchange tube head by highly alkaline materials in the liquid inlet chamber can be directly blocked. Simultaneously, the buffer layer between the inner wall of the protective sleeve and the outer wall of the heat exchange tube further absorbs the impact energy generated by the material flow, preventing the tube head from failing to seal due to long-term wear. This effectively extends the service life of the heat exchange tube bundle, reduces equipment maintenance frequency and costs, and ensures the continuity of the production process. Furthermore, the effective protection of the tube head by the protective sleeve completely prevents direct contact between highly alkaline materials and steam in the heat exchange chamber. This prevents the loss of alkaline solution during steam condensation, reducing production costs, and ensures that the condensate does not carry alkaline content, meeting subsequent recycling or discharge standards, thus improving resource utilization and environmental friendliness. At the same time, the liquid distribution device in the liquid inlet chamber ensures that the material is evenly distributed to each heat exchange tube. Combined with the reasonable layout of the heat exchange chamber and the vapor-liquid separation chamber, the original high-efficiency heat transfer and vapor-liquid separation performance of the evaporator can be maintained, further ensuring the overall evaporation and concentration efficiency and operational stability of the equipment.

[0023] The foregoing description describes some exemplary embodiments of this utility model. It is understood that the above embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. The features in these embodiments can be recombine in a suitable manner, and the resulting solutions are still within the scope of protection claimed by this utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without inventive effort, that is, all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by this utility model.

Claims

1. A tubular falling film evaporator with a protective sleeve, characterized in that, The evaporator (1) includes an evaporator (1) with an upper partition (2), a lower partition (3), and a heat exchange tube (4) inside. Above the upper partition (2) is a liquid inlet chamber, between the upper partition (2) and the lower partition (3) is a heat exchange chamber, and below the lower partition (3) is a vapor-liquid separation chamber. The upper end of the heat exchange tube (4) is higher than the upper partition (2) and communicates with the liquid inlet chamber, while the lower end of the heat exchange tube (4) communicates with the vapor-liquid separation chamber. The heat exchange tube (4) is higher than the liquid inlet chamber. The upper partition (2) is provided with a protective sleeve (5), and a buffer layer is provided between the inner wall of the protective sleeve (5) and the outer wall of the heat exchange tube (4); the liquid inlet chamber is provided with a liquid inlet (6), and a liquid distribution device is provided in the liquid inlet chamber; the upper part of the heat exchange chamber is connected to a steam pipe (7), and the lower part is connected to a condensate pipe (8), and a waste steam pipe (9) is provided on the condensate pipe; the bottom of the vapor-liquid separation chamber is provided with a liquid outlet (10), and the upper part of the vapor-liquid separation chamber is provided with a waste steam outlet (11).

2. A tubular falling film evaporator with a protective sleeve according to claim 1, characterized in that, The liquid distribution device includes a liquid distribution plate and liquid equalization holes. The liquid distribution plate is parallel to the upper partition plate (2). The liquid equalization holes are evenly distributed on the liquid distribution plate, and the ratio of the diameter of the liquid equalization holes to the inner diameter of the heat exchange tube (4) is 1:3-5.

3. A tubular falling film evaporator with a protective sleeve according to claim 1, characterized in that, The length of the protective sleeve (5) is 2-3 cm longer than the portion of the heat exchange tube (4) that is higher than the upper partition plate (2), and the outer wall of the protective sleeve (5) is provided with reinforcing ribs.

4. A tubular falling film evaporator with a protective sleeve according to claim 1, characterized in that, The steam pipeline (7) is equipped with a steam filter, a pressure regulating valve and a flow meter in sequence.

5. A tubular falling film evaporator with a protective sleeve according to claim 1, characterized in that, The end of the exhaust steam pipe (9) is connected to the exhaust steam heat exchanger.

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