A liquid seal structure for a fluorosilicic acid preheater

Abstract

This utility model discloses a liquid seal structure for a fluorosilicic acid preheater, including a fluorosilicic acid preheater. A fluorosilicic acid feed pipe is connected to the bottom of the preheater, a fluorosilicic acid discharge pipe is connected to the top, a steam condensate inlet pipe is connected to the upper side of the preheater, and a heat medium delivery pipe is connected to the lower side of the preheater. A liquid seal structure is provided on the heat medium delivery pipe to increase the liquid level of the steam condensate inside the preheater. This utility model improves the preheating efficiency of fluorosilicic acid by increasing the liquid level of the steam condensate inside the preheater through the liquid seal structure on the heat medium delivery pipe, allowing the heat exchanger tubes inside the preheater to be immersed in the steam condensate.

Description

Technical Field

[0001] This utility model relates to the technical field of anhydrous hydrogen fluoride production equipment, and in particular to a liquid seal structure for a fluorosilicic acid preheater. Background Technology

[0002] In our current anhydrous hydrogen fluoride production process, 18% of the raw material, fluorosilicic acid, needs to be preheated. Due to space constraints and equipment placement, the fluorosilicic acid can only enter the heat exchanger tube layer from the bottom of the fluorosilicic acid preheater, while the heat medium enters the heat exchanger shell layer from the top. The heat medium delivery pipe of the fluorosilicic acid preheater is located on the lower side of the preheater. To utilize energy, steam condensate is used as the heat medium. However, because the steam condensate temperature is not high, and the heat medium delivery pipe is located on the lower side of the preheater, part of the preheater shell layer cannot store steam condensate, resulting in low preheating efficiency for the fluorosilicic acid. Therefore, we have improved the existing fluorosilicic acid preheater. Utility Model Content

[0003] The technical problem to be solved by this utility model is to address the problems existing in the background art and provide a liquid seal structure for a fluorosilicic acid preheater. By setting a liquid seal structure on the heat medium external delivery pipe, the liquid level of steam condensate inside the fluorosilicic acid preheater is increased, thereby improving the preheating efficiency of fluorosilicic acid.

[0004] The purpose of this utility model is achieved as follows: a liquid seal structure for a fluorosilicic acid preheater, comprising a fluorosilicic acid preheater, wherein a fluorosilicic acid feed pipe is connected to the bottom of the fluorosilicic acid preheater, a fluorosilicic acid discharge pipe is connected to the top of the fluorosilicic acid preheater, a steam condensate inlet pipe is connected to the upper side of the fluorosilicic acid preheater, and a heat medium delivery pipe is connected to the lower side of the fluorosilicic acid preheater, wherein a liquid seal structure is provided on the heat medium delivery pipe, the liquid seal structure being used to increase the liquid level of the steam condensate inside the fluorosilicic acid preheater.

[0005] The liquid seal structure includes a first vertical pipe, a second vertical pipe, and a connecting pipe. The two ends of the connecting pipe are connected to the top ends of the first vertical pipe and the second vertical pipe, respectively, to form a door frame structure. The lower end of the first vertical pipe is connected to the heat medium delivery pipe, and the lower end of the second vertical pipe is connected to the downstream pipeline.

[0006] The liquid seal structure includes a vertical fixed pipe, the lower end of which is connected to a heat medium delivery pipe, the lower end of which is inserted into the vertical fixed pipe from the upper end, the telescopic pipe and the vertical fixed pipe are slidably sealed together, the upper end of which is connected to one end of a flexible hose, and the other end of the flexible hose is connected to a downstream pipeline.

[0007] The upper end of the telescopic tube is sealed by a cover plate, and an outlet tube is provided on the side of the upper end of the telescopic tube, which is connected to one end of the flexible tube.

[0008] A connector is fixedly installed on the cover plate, and a telescopic device is installed on the connector.

[0009] The telescopic device is either an electric cylinder or an electric push rod.

[0010] A sealing ring is installed at the top of the vertical fixed tube, and at least one first annular groove is provided inside the sealing ring. A sealing ring is installed inside the first annular groove, and the lower end of the telescopic tube passes through the sealing ring.

[0011] The sealing ring has two first annular grooves, and a second annular groove is provided between the upper and lower first annular grooves. A guide ring is installed in the second annular groove.

[0012] The features of this utility model using the above-mentioned technical solution are: 1. This utility model improves the preheating efficiency of fluorosilicic acid by setting a liquid seal structure on the heat medium delivery pipe, thereby increasing the liquid level of steam condensate inside the fluorosilicic acid preheater and allowing the heat exchanger tubes inside the fluorosilicic acid preheater to be immersed in steam condensate.

[0013] 2. The liquid seal structure of this utility model adopts an adjustable liquid level structure. When the temperature of steam condensate is high in summer, the liquid level in the fluorosilicic acid preheater is reduced to avoid overheating. When the temperature of steam condensate is low in winter, the liquid level in the fluorosilicic acid preheater can be increased to ensure the preheating temperature. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the first embodiment of the liquid seal structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the second embodiment of the liquid seal structure of this utility model.

[0017] Figure 3 This is a diagram showing the state of the second embodiment of the liquid seal structure of this utility model when the height of steam condensate is reduced.

[0018] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0019] Figure 5 This is one embodiment of the telescopic device of this utility model.

[0020] Figure label: Fluorosilicic acid preheater 10, fluorosilicic acid feed pipe 11, fluorosilicic acid discharge pipe 12, steam condensate inlet pipe 13, heat medium delivery pipe 14, downstream pipe 15, first flange group 151, first pipe joint 152. Liquid seal structure 20, first vertical pipe 21, second vertical pipe 22, connecting pipe 23, vertical fixed pipe 24, flange 241, screw 242, sealing ring 25, first annular groove 251, sealing ring 252, second annular groove 253, guide ring 254, telescopic pipe 26, cover plate 261, outlet pipe 262, second flange assembly 263, second pipe joint 264, connector 265, hose 27, telescopic device 28; Bracket 30. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0023] Example 1: See Figure 1-2 A liquid seal structure for a fluorosilicic acid preheater includes a fluorosilicic acid preheater 10, with a fluorosilicic acid feed pipe 11 connected to the bottom of the fluorosilicic acid preheater 10, a fluorosilicic acid discharge pipe 12 connected to the top of the fluorosilicic acid preheater 10, a steam condensate inlet pipe 13 connected to the upper side of the fluorosilicic acid preheater 10, and a heat medium delivery pipe 14 connected to the lower side of the fluorosilicic acid preheater 10. A liquid seal structure 20 is provided on the heat medium delivery pipe 14, and the liquid seal structure 20 is used to increase the liquid level of the steam condensate inside the fluorosilicic acid preheater 10.

[0024] By setting a liquid seal structure 20 on the heat medium delivery pipe 14, the liquid level of the steam condensate inside the fluorosilicic acid preheater 10 is increased, so that the heat exchanger tube layer inside the fluorosilicic acid preheater can be immersed in the steam condensate, thereby improving the preheating efficiency of fluorosilicic acid.

[0025] In use, 18% of the raw material fluorosilicic acid enters the heat exchanger tube layer inside the fluorosilicic acid preheater 10 through the fluorosilicic acid feed pipe 11 for preheating. The preheated raw material fluorosilicic acid is discharged through the fluorosilicic acid discharge pipe 12. Steam condensate enters the heat exchanger shell layer through the steam condensate inlet pipe 13 and is then discharged through the heat medium delivery pipe 14.

[0026] In this embodiment, see Figure 1 This is a liquid seal structure with a fixed liquid level. The liquid seal structure 20 includes a first vertical pipe 21, a second vertical pipe 22, and a connecting pipe 23. The two ends of the connecting pipe 23 are connected to the top ends of the first vertical pipe 21 and the second vertical pipe 22, respectively, forming a door frame structure. The lower end of the first vertical pipe 21 is connected to the external heat medium delivery pipe 14, and the lower end of the second vertical pipe 22 is connected to the downstream pipe 15. By controlling the height of the connecting pipe 23 during welding, the liquid level of the steam condensate inside the fluorosilicic acid preheater 10 can be controlled.

[0027] Example 2: The difference between this embodiment and embodiment 1 is that the liquid seal structure 20 adopts a liquid level adjustable structure. When the temperature of steam condensate is high in summer, the liquid level in the fluorosilicic acid preheater 10 is reduced to avoid overheating. When the temperature of steam condensate is low in winter, the liquid level in the fluorosilicic acid preheater 10 can be increased to ensure the preheating temperature.

[0028] Specifically, see Figure 2 , 3 The liquid seal structure 20 includes a vertical fixed pipe 24, the lower end of which is connected to the heat medium delivery pipe 14. The lower end of a telescopic pipe 26 is inserted into the vertical fixed pipe 24 from its upper end, and the telescopic pipe 26 is slidably sealed to the vertical fixed pipe 24. The upper end of the telescopic pipe 26 is connected to one end of a flexible hose 27, and the other end of the flexible hose 27 is connected to the downstream pipe 15. By adjusting the height of the telescopic pipe 26, the height of the outlet of the heat medium delivery pipe 14 is adjusted, thereby adjusting the liquid level of the steam condensate inside the fluorosilicic acid preheater 10.

[0029] Hose 27 can be made of steel wire hose.

[0030] See Figure 2 The upper end of the telescopic tube 26 is closed by a cover plate 261, and an outlet tube 262 is provided on the side of the upper end of the telescopic tube 26. The outlet tube 262 is connected to one end of the hose 27.

[0031] Furthermore, a connector 265 is fixedly installed on the cover plate 261, and a telescopic device 28 is installed on the connector 265.

[0032] By installing the telescopic device 28, the telescopic tube 26 can be moved up and down, thus eliminating the need for manual adjustment.

[0033] Specifically, the telescopic device 28 is either an electric cylinder or an electric push rod.

[0034] See Figure 5 A bracket 30 can be welded to the top of the fluorosilicic acid preheater 10. The fixed end of the telescopic device 28 is installed on the bracket 30 by bolts. The telescopic end of the telescopic device 28 is connected to the connector 265. The connector 265 can be a nut seat or a double-eared hinge seat.

[0035] See Figure 2 When the telescopic device 28 is shortened, the telescopic pipe 26 is raised. At this time, the outlet pipe 262 is at its highest position, and the liquid level of steam condensate in the fluorosilicic acid preheater 10 is at its highest. (See also...) Figure 3 When the telescopic device 28 extends, the telescopic pipe 26 moves downward, at which point the outlet pipe 262 is at its lowest position, and the liquid level of steam condensate in the fluorosilicic acid preheater 10 is at its lowest. The outlet pipe 262 can be adjusted between the lowest and highest liquid levels as needed.

[0036] Specifically, see Figure 2 The upstream end of the downstream pipe 15 is equipped with a first flange group 151, which includes two flanges. One flange is welded to the downstream pipe 15, and the other flange is welded with a first pipe joint 152. The two flanges are connected by bolts, and a gasket is installed between the two flanges. The first pipe joint 152 is connected and fixed to one end of the hose 27.

[0037] The end of the outlet pipe 262 is equipped with a second flange assembly 263, which also includes two flanges. One flange is welded to the outlet pipe 262, and the other flange is welded with a second pipe joint 264. The two flanges are connected by bolts, and a sealing gasket is installed between the two flanges. The second pipe joint 264 is connected and fixed to the other end of the hose 27.

[0038] Example 3: Based on Example 2, see Figure 4 A sealing ring 25 is installed at the top of the vertical fixed pipe 24. At least one first annular groove 251 is provided inside the sealing ring 25, and a sealing ring 252 is installed inside the first annular groove 251. The lower end of the telescopic pipe 26 passes through the sealing ring 252. Through the above structure, a sliding sealing connection between the telescopic pipe 26 and the vertical fixed pipe 24 is achieved.

[0039] Furthermore, the sealing ring 25 has two first annular grooves 251, and a second annular groove 253 is provided between the upper and lower first annular grooves 251. A guide ring 254 is installed in the second annular groove 253. The guide ring 254 guides the telescopic tube 26. The guide ring 254 is existing technology and is made of polyoxymethylene to prevent the telescopic tube 26 from directly contacting and rubbing against the inner wall of the vertical fixed tube 24 during movement.

[0040] Specifically, a flange 241 is welded to the top of the vertical fixed pipe 24, and a sealing ring 25 is installed on the top of the flange 241 by multiple screws 242. The sealing ring 25 and the flange 241 are sealed by a sealing gasket or sealant.

[0041] The working principle or process of this utility model: When using. See also Figure 2 When the telescopic device 28 is shortened, the telescopic pipe 26 is lifted. At this time, the outlet pipe 262 is at the highest position, and the liquid level of steam condensate in the fluorosilicic acid preheater 10 is the highest.

[0042] See Figure 3 When the telescopic device 28 extends, the telescopic pipe 26 moves downward. At this time, the outlet pipe 262 is at its lowest position, and the liquid level of steam condensate in the fluorosilicic acid preheater 10 is at its lowest.

[0043] This allows the outlet pipe 262 to be adjusted between the lowest and highest liquid levels as needed.

[0044] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Any modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A liquid seal structure of fluosilicic acid preheater comprising a fluosilicic acid preheater (10) characterized by: The bottom of the fluorosilicic acid preheater (10) is connected to a fluorosilicic acid feed pipe (11), the top of the fluorosilicic acid preheater (10) is connected to a fluorosilicic acid discharge pipe (12), the upper side of the fluorosilicic acid preheater (10) is connected to a steam condensate inlet pipe (13), and the lower side of the fluorosilicic acid preheater (10) is connected to a heat medium delivery pipe (14). The heat medium delivery pipe (14) is provided with a liquid seal structure (20), which is used to increase the liquid level of the steam condensate inside the fluorosilicic acid preheater (10).

2. The liquid seal structure for a fluorosilicic acid preheater according to claim 1, characterized in that: The liquid seal structure (20) includes a first vertical pipe (21), a second vertical pipe (22) and a connecting pipe (23). The two ends of the connecting pipe (23) are respectively connected to the top ends of the first vertical pipe (21) and the second vertical pipe (22) to form a door frame structure. The lower end of the first vertical pipe (21) is connected to the heat medium delivery pipe (14), and the lower end of the second vertical pipe (22) is connected to the downstream pipe (15).

3. The liquid seal structure for a fluorosilicic acid preheater according to claim 1, characterized in that: The liquid seal structure (20) includes a vertical fixed pipe (24), the lower end of which is connected to the heat medium delivery pipe (14), the lower end of the telescopic pipe (26) is inserted into the vertical fixed pipe (24) from the upper end of the vertical fixed pipe (24), the telescopic pipe (26) is slidably sealed to the vertical fixed pipe (24), the upper end of the telescopic pipe (26) is connected to one end of the hose (27), and the other end of the hose (27) is connected to the downstream pipe (15).

4. The liquid seal structure for a fluorosilicic acid preheater according to claim 3, characterized in that: The upper end of the telescopic tube (26) is closed by a cover plate (261), and an outlet tube (262) is provided on the side of the upper end of the telescopic tube (26). The outlet tube (262) is connected to one end of the hose (27).

5. The liquid seal structure for a fluorosilicic acid preheater according to claim 4, characterized in that: A connector (265) is fixedly installed on the cover plate (261), and a telescopic device (28) is installed on the connector (265).

6. The liquid seal structure for a fluorosilicic acid preheater according to claim 5, characterized in that: The telescopic device (28) is either an electric cylinder or an electric push rod.

7. The liquid seal structure for a fluorosilicic acid preheater according to claim 3, characterized in that: A sealing ring (25) is installed at the top of the vertical fixed tube (24). At least one first ring groove (251) is provided in the sealing ring (25). A sealing ring (252) is installed in the first ring groove (251). The lower end of the telescopic tube (26) passes through the sealing ring (252).

8. The liquid seal structure for a fluorosilicic acid preheater according to claim 7, characterized in that: The sealing ring (25) is provided with two first ring grooves (251), and a second ring groove (253) is provided between the upper and lower two first ring grooves (251). A guide ring (254) is installed in the second ring groove (253).

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