A scrubbing column for hydrogen fluoride gas

Abstract

This utility model discloses a scrubbing tower for hydrogen fluoride gas. The bottom of the scrubbing tower, from bottom to top, includes a scrubbing liquid circulation tank and a filtration mechanism. The top side and bottom of the scrubbing liquid circulation tank are respectively provided with an overflow port and a drain port. The overflow port is connected to an acid-producing reaction device, and the drain port is connected to the liquid inlet at the top of the scrubbing tower via a circulation pump. The overflow port is located below the filtration mechanism. The filtration mechanism includes a filter screen, a variable-diameter auger, and a motor. The filter screen is installed inside the scrubbing tower. The feed end of the variable-diameter auger is connected to the discharge end of the filter screen, and the power output end of the motor is connected to the power input end of the variable-diameter auger. The smaller diameter end of the variable-diameter auger has a slag discharge port located outside the scrubbing tower. The variable-diameter auger has a downward-facing liquid outlet with an arc-shaped filter plate. This scrubbing tower adopts a combined tower and tank design, enabling automatic control and filtering of the scrubbing liquid, ensuring the normal operation of the scrubbing system. It also achieves automatic slag discharge without liquid discharge during the filtration process.

Description

Technical Field

[0001] This utility model relates to the field of scrubbing tower technology, and in particular to a scrubbing tower for hydrogen fluoride gas. Background Technology

[0002] Existing washing system (such as) Figure 4 The structure consists of a washing tower, a washing circulation tank, a washing circulation pump, and related accessories. The related accessories mainly include regulating valves and weighing equipment (or level gauges). The washing circulation liquid is mainly sulfuric acid. The sulfuric acid enters the washing tower through the top to wash the hydrogen fluoride gas. After washing, it flows into the washing circulation tank. The washing liquid in the washing circulation tank is pumped by the washing circulation pump, and part of it is pumped into the top of the washing tower for circulation washing. Part of it is controlled by the regulating valve to enter the acid production reaction system and is also replenished into the washing tower.

[0003] The increase in weight of the washing circulation tank during the washing process is mainly due to the raw sulfuric acid and impurities introduced during washing. To ensure a stable and quantitative flow of sulfuric acid into the reaction system, a weighing module needs to be added to the washing circulation tank. The opening of the regulating valve is controlled by the weight change in the tank, thus controlling the amount of acid entering the washing system and maintaining a balance between the inflow and outflow of acid. This control is achieved through PID regulation. However, in actual production, the pressure and flow rate of the washing circulation pump change with the liquid level in the tank. This causes variations in flow rate even with the same valve opening, requiring frequent real-time adjustments to the valve opening to control the flow rate, often resulting in a lag. Furthermore, some impurities deposit at the bottom of the tank, affecting the tank's capacity for the washing liquid, while others flow with the washing liquid, impacting the washing system's effectiveness. Utility Model Content

[0004] The purpose of this invention is to provide a scrubbing tower for hydrogen fluoride gas, so as to solve the problems of difficult control of the amount of acid entering and leaving the existing hydrogen fluoride gas scrubbing tower and the impact of impurities on the working effect.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A hydrogen fluoride gas scrubbing tower includes a scrubbing liquid circulation tank and a filtration mechanism arranged sequentially from bottom to top at its bottom. The top side and bottom of the scrubbing liquid circulation tank are respectively provided with an overflow port and a drain port. The overflow port is connected to an acid production reaction device, and the drain port is connected to the liquid inlet at the top of the scrubbing tower via a circulation pump.

[0007] The overflow port is located below the filtration mechanism;

[0008] The filtration mechanism includes a filter screen, a variable diameter auger, and a motor. The filter screen is installed inside the washing tower. The feed end of the variable diameter auger is connected to the discharge end of the filter screen. The power output end of the motor is connected to the power input end of the variable diameter auger. The smaller diameter end of the variable diameter auger is provided with a slag discharge port located outside the washing tower.

[0009] The variable-diameter auger is provided with a downward-facing outlet with an arc-shaped filter.

[0010] A further technical solution is that the middle part of the filter screen is inclined downward, and the middle part of the filter screen is connected to the variable diameter auger.

[0011] A further technical solution is as follows: the variable diameter auger includes a variable diameter cylinder and variable diameter spiral blades adapted to the variable diameter cylinder. The variable diameter spiral blades are rotatably installed in the variable diameter cylinder, and the outer end of the variable diameter spiral blades is connected to the power output end of the motor. The slag discharge port is located at the smaller diameter end of the variable diameter cylinder, and the variable diameter cylinder is provided with a downward-facing liquid outlet with an arc-shaped filter.

[0012] A further technical solution is that multiple filter holes are uniformly arranged on the variable diameter spiral blade.

[0013] A further technical solution is that the pitch of the variable diameter helical blades gradually decreases along the conveying direction.

[0014] A further technical solution is that a liquid level sensor is installed at the overflow port, and the liquid level sensor is electrically connected to the circulating pump through a PLC controller.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0016] This invention proposes a scrubbing tower for hydrogen fluoride gas. The scrubbing tower adopts a combined tower and tank design. The amount of sulfuric acid entering and leaving the tower is controlled by the overflow port of the scrubbing liquid circulation tank at the bottom of the tower, which can achieve automatic control and always ensure that the amount of acid in the storage tank is constant. When the inflow of acid is large, the excess acid will automatically flow into the reaction system from the overflow port, thus maintaining a constant amount of acid circulating in the scrubbing tower and stably controlling the inflow and outflow of acid. It eliminates the need for weighing modules, regulating valves, and other components required by PID control systems.

[0017] In addition, a filtration mechanism is installed above the washing liquid circulation tank to filter the washing liquid, ensuring the normal operation of the washing system, and can automatically discharge sludge without discharging liquid during the filtration process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a hydrogen fluoride gas scrubbing tower according to the present invention.

[0019] Figure 2 This utility model Figure 1 A schematic diagram of the filter mechanism.

[0020] Figure 3 This utility model Figure 2 Another structural diagram from another perspective.

[0021] Figure 4 This is a schematic diagram of the structure of a hydrogen fluoride gas scrubbing tower in the prior art of this utility model.

[0022] Attached reference numerals: 1. Washing tower; 2. Washing liquid circulation tank; 3. Filtration mechanism; 4. Overflow port; 5. Drain port; 6. Circulation pump; 7. Filter screen; 8. Variable diameter auger; 9. Motor; 10. Slag discharge port; 11. Variable diameter cylinder; 12. Variable diameter spiral blade. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0029] Example 1:

[0030] This implementation example Figure 1 , Figure 2 and Figure 3 As shown, a washing tower for hydrogen fluoride gas is provided. The bottom of the washing tower 1 is provided with a washing liquid circulation tank 2 and a filter mechanism 3 from bottom to top. The top side and bottom of the washing liquid circulation tank 2 are respectively provided with an overflow port 4 and a drain port 5. The overflow port 4 is connected to the acid production reaction equipment, and the drain port 5 is connected to the liquid inlet at the top of the washing tower 1 through a circulation pump 6. The overflow port 4 is located below the filter mechanism 3. The filter mechanism 3 includes a filter screen 7, a variable diameter auger 8 and a motor 9. The filter screen 7 is installed inside the washing tower 1. The feed end of the variable diameter auger 8 is connected to the discharge end of the filter screen 7. The power output end of the motor 9 is connected to the power input end of the variable diameter auger 8. The smaller diameter end of the variable diameter auger 8 is provided with a slag discharge port 10 located outside the washing tower 1. The variable diameter auger 8 is provided with a downward-facing liquid outlet with an arc-shaped filter.

[0031] The working process of this utility model is as follows: First, when the dust-laden hydrogen fluoride gas enters from the air inlet on the lower side of the scrubbing tower 1 and flows upward, the scrubbing tower 1 sprays detergent from the top downward to remove impurities and dust from the rising hydrogen fluoride gas. Second, the clean hydrogen fluoride gas is discharged and collected from the exhaust port at the top of the scrubbing tower 1. Then, the falling detergent, carrying dust, is filtered by the filter mechanism 3 and falls into the washing liquid circulation tank 2 at the bottom of the scrubbing tower 1. Finally, the washing liquid in the washing liquid circulation tank 2 is transported in two ways. One way is directly introduced into the scrubbing tower 1 through the circulation pump 6 and sprayed from the top downward. The other way is directly returned to the acid production reaction equipment through the overflow port 4 of the washing liquid circulation tank 2 without additional control.

[0032] It is worth noting that: when impurities and some of the washing liquid enter the variable diameter auger 8, because the variable diameter auger 8 is conical, the slag will be discharged upwards and will not affect the flow of the washing liquid into the washing liquid circulation tank 2.

[0033] Preferably, the middle part of the filter screen 7 is inclined downward, and the middle part of the filter screen 7 is connected to the variable diameter auger 8.

[0034] The filter screen 7 is tilted towards the center, which increases the filtration surface and makes it easier for impurities to gather in the center and enter the variable diameter auger 8.

[0035] Preferably, such as Figure 3 As shown, the variable diameter auger 8 includes a variable diameter cylinder 11 and a variable diameter spiral blade 12 adapted to the variable diameter cylinder 11. The variable diameter spiral blade 12 is rotatably installed inside the variable diameter cylinder 11, and the outer end of the variable diameter spiral blade 12 is connected to the power output end of the motor 9. The slag discharge port 10 is set on the smaller diameter end of the variable diameter cylinder 11, and the variable diameter cylinder 11 is provided with a downward-facing liquid outlet with an arc-shaped filter.

[0036] The variable diameter spiral blades 12 are driven by the motor 9 to rotate, squeezing and discharging the filter residue that enters the variable diameter cylinder 11.

[0037] Preferably, the variable diameter spiral blade 12 is provided with a plurality of filter holes evenly distributed on it.

[0038] The variable diameter spiral blades 12 in the variable diameter cylinder 11 also generate extrusion pressure when discharging the filter residue, and the extruded washing liquid can be discharged through the filter holes.

[0039] Preferably, the pitch of the variable diameter helical blade 12 gradually decreases along the conveying direction.

[0040] The variable diameter spiral blade 12 is a variable pitch spiral, which can gradually increase the squeezing pressure on the filter residue and reduce the residue of washing liquid.

[0041] Preferably, a liquid level sensor is installed at the overflow port 4, and the liquid level sensor is electrically connected to the circulating pump 6 through a PLC controller.

[0042] The level sensor primarily detects the overflow level in the washing liquid circulation tank 2. If the overflow is persistent or excessive, the operating speed of the circulation pump 6 and the acid-producing reaction equipment can be appropriately adjusted.

[0043] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A scrubbing tower for hydrogen fluoride gas, characterized in that: The bottom of the washing tower (1) is provided with a washing liquid circulation tank (2) and a filter mechanism (3) from bottom to top. The top side and bottom of the washing liquid circulation tank (2) are respectively provided with an overflow port (4) and a drain port (5). The overflow port (4) is connected to the acid production reaction equipment, and the drain port (5) is connected to the liquid inlet at the top of the washing tower (1) through a circulation pump (6). The overflow port (4) is located below the filter mechanism (3); The filtration mechanism (3) includes a filter screen (7), a variable diameter auger (8), and a motor (9). The filter screen (7) is installed inside the washing tower (1). The feed end of the variable diameter auger (8) is connected to the discharge end of the filter screen (7). The power output end of the motor (9) is connected to the power input end of the variable diameter auger (8). The smaller diameter end of the variable diameter auger (8) is provided with a slag discharge port (10) located outside the washing tower (1). The variable diameter auger (8) is provided with a downward-facing outlet with an arc-shaped filter.

2. The hydrogen fluoride gas scrubbing tower according to claim 1, characterized in that: The middle part of the filter (7) is inclined downward, and the middle part of the filter (7) is connected to the variable diameter auger (8).

3. The hydrogen fluoride gas scrubbing tower according to claim 1, characterized in that: The variable diameter auger (8) includes a variable diameter cylinder (11) and a variable diameter spiral blade (12) adapted to the variable diameter cylinder (11). The variable diameter spiral blade (12) is rotatably installed inside the variable diameter cylinder (11), and the outer end of the variable diameter spiral blade (12) is connected to the power output end of the motor (9). The slag discharge port (10) is located on the smaller diameter end of the variable diameter cylinder (11). The variable diameter cylinder (11) is provided with a downward-facing liquid outlet with an arc-shaped filter.

4. The hydrogen fluoride gas scrubbing tower according to claim 3, characterized in that: The variable diameter spiral blade (12) is uniformly provided with multiple filter holes.

5. The hydrogen fluoride gas scrubbing tower according to claim 3, characterized in that: The pitch of the variable diameter helical blade (12) gradually decreases along the conveying direction.

6. The hydrogen fluoride gas scrubbing tower according to claim 1, characterized in that: A liquid level sensor is provided at the overflow port (4), and the liquid level sensor is electrically connected to the circulating pump (6) through a PLC controller.

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