Device for monitoring liquid level of reboiler of rectifying tower

Abstract

The utility model relates to the technical field of hydrofluoric acid rectifying tower liquid level monitoring, in particular to a device for monitoring the liquid level of a rectifying tower reboiler. The device for monitoring the liquid level of the rectifying tower reboiler comprises a tower kettle, the bottom of the tower kettle is fixedly connected with a liquid outlet pipe, the liquid outlet pipe is communicated with a liquid communicating mechanism, the liquid level communicating mechanism comprises a liquid level communicating vessel, the liquid level communicating vessel and the tower kettle are located on the same horizontal plane, and the liquid level communicating vessel is communicated with the liquid outlet pipe. A liquid level monitor for monitoring liquid level information in the liquid level communicating vessel is mounted on the liquid level communicating vessel, so that the liquid level in the tower kettle is indirectly measured by measuring the liquid level in the communicating vessel, and the liquid level in the tower kettle of the rectifying tower is accurately measured; the technical problem that the liquid level of an existing hydrofluoric acid rectifying tower reboiler cannot be accurately measured is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level monitoring of a hydrofluoric acid distillation tower, in particular to a device for monitoring the liquid level of a distillation tower reboiler. Background Art

[0002] Electronic grade hydrofluoric acid is an important chemical substance commonly used in semiconductor manufacturing, mainly used in large integrated circuits as a cleaning agent and corrosive agent. Today's semiconductor process has very high requirements for the purity of hydrofluoric acid, which has reached the requirements of less than 10ppt for metal ions and less than 3ppb for anions. Therefore, in order to remove impurities from 99.95% pure industrial grade anhydrous hydrofluoric acid, it is necessary to go through a multi-stage gasification and condensation purification method to separate and remove high-boiling point and low-boiling point impurities from anhydrous hydrofluoric acid.

[0003] In the distillation process of manufacturing electronic-grade hydrofluoric acid, the liquid level in the tower reboiler needs to maintain a certain stability, so the liquid level needs to be monitored. The only liquid level meter currently used is the radar wave liquid level meter, which can meet the requirements of cleanliness and accuracy at the same time. However, because the interior of the reboiler is full of plastic tube bundles, the radar wave will be disturbed and reflected by the internal tube bundles when using it, which will eventually affect the measurement of the liquid level.

[0004] Therefore, there is an urgent need to provide a monitoring device for accurately measuring the liquid level in the bottom of a distillation tower. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a device for monitoring the liquid level of a reboiler of a distillation tower.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a device for monitoring the liquid level of a distillation tower reboiler, comprising a tower kettle, a liquid outlet pipe is fixedly connected to the bottom of the tower kettle, a liquid outlet pipe is connected to a liquid connecting mechanism, the liquid level connecting mechanism comprises a liquid level communicating vessel, the liquid level communicating vessel and the tower kettle are located on the same horizontal plane, and a liquid level monitor for monitoring the liquid level information in the liquid level communicating vessel is installed on the liquid level communicating vessel.

[0007] Furthermore, the liquid level communicating vessel and the tower kettle form a U shape.

[0008] Furthermore, the liquid level communicating vessel is J-shaped.

[0009] Furthermore, an air outlet pipe is fixedly connected to the tower kettle, and the air outlet pipe is connected to the first condensing mechanism.

[0010] Furthermore, the first condensing mechanism includes a first condenser, and a liquid outlet pipe of the first condenser is connected to a hydrofluoric acid storage tank.

[0011] Furthermore, the liquid level monitor is a radar wave liquid level meter.

[0012] Furthermore, it also includes a reaction kettle, a second condensing mechanism is installed between the reaction kettle and the tower kettle, the second condensing mechanism includes a second condenser, and the liquid outlet pipe of the second condenser is connected to the top of the tower kettle.

[0013] Furthermore, a feeding mechanism is provided at the upper end of the reactor, and the feeding mechanism includes a feeding tank and a first motor. The output end of the first motor is connected to a transmission rod, and a spiral blade is wound around the transmission rod.

[0014] Furthermore, the transmission rod has a truncated cone structure, and the diameter of the transmission rod gradually increases from left to right.

[0015] Furthermore, a stirring assembly for adjusting the air pressure and mixing the raw materials is installed in the reactor, and the stirring assembly includes a second motor installed outside the reactor, and the output end of the second motor is connected to a rotating shaft, and a stirring blade is installed on the rotating shaft.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0017] The present application has a liquid outlet pipe fixedly connected to the bottom of the tower kettle, the liquid outlet pipe is connected to a liquid connecting mechanism, the liquid level connecting mechanism includes a liquid level communicating vessel, the liquid level communicating vessel and the tower kettle are located on the same horizontal plane, and a liquid level monitor for monitoring the liquid level information in the liquid level communicating vessel is installed on the liquid level communicating vessel, thereby achieving indirect measurement of the liquid level in the tower kettle by measuring the liquid level in the communicating vessel, thereby achieving accurate measurement of the liquid level in the tower kettle of the distillation tower, and solving the technical problem that the liquid level in the reboiler of the existing hydrofluoric acid distillation tower cannot be accurately measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a device for monitoring the liquid level of a distillation tower reboiler in a preferred embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of the reactor in the preferred embodiment of the utility model.

[0020] Figure numerals: 1, tower bottom; 2, liquid outlet pipe; 3, liquid level connecting vessel; 4, liquid level monitor; 5, air outlet pipe; 6, first condenser; 7, hydrofluoric acid storage tank; 8, reactor; 9, second condenser; 10, spiral blade; 11, feed tank; 12, first motor; 13, second motor; 14, rotating shaft; 15, stirring blade; 16, transmission rod. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described 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-Figure 2 As shown, a preferred embodiment of the utility model is a device for monitoring the liquid level of a distillation tower reboiler, comprising a tower kettle 1, a liquid outlet pipe 2 is fixedly connected to the bottom of the tower kettle 1, a liquid outlet pipe 2 is connected to the liquid outlet pipe 2, the liquid level connecting mechanism comprises a liquid level communicating vessel 3, the liquid level communicating vessel 3 and the tower kettle 1 are located on the same horizontal plane, and a liquid level monitor 4 for monitoring the liquid level information in the liquid level communicating vessel 3 is installed on the liquid level communicating vessel 3, so that the liquid level in the tower kettle 1 can be indirectly measured by measuring the liquid level in the communicating vessel 3, thereby realizing accurate measurement of the liquid level in the tower kettle 1 of the distillation tower, and solving the technical problem that the liquid level in the reboiler of the existing hydrofluoric acid distillation tower cannot be accurately measured.

[0023] As a preferred embodiment of the utility model, it may also have the following additional technical features: the liquid level communicating vessel 3 and the tower bottom 1 form a U shape, and the liquid level communicating vessel 3 is J-shaped. Thus, the liquid level in the tower bottom 1 can be indirectly measured by measuring the liquid level in the communicating vessel 3, thereby achieving accurate measurement of the liquid level in the tower bottom 1 of the distillation tower.

[0024] In this embodiment, the tower kettle 1 is fixedly connected with an outlet pipe 5, and the outlet pipe 5 is connected with a first condensing mechanism, and the first condensing mechanism includes a first condenser 6, and the liquid outlet pipe of the first condenser 6 is connected with a hydrofluoric acid storage tank 7. Thus, the preparation of hydrofluoric acid is achieved.

[0025] In this embodiment, the liquid level monitor 4 is a radar wave liquid level meter, thereby achieving accurate measurement of the reboiler of the distillation tower.

[0026] In this embodiment, a reactor 8 is also included. A second condensing mechanism is installed between the reactor 8 and the tower reactor 1. The second condensing mechanism includes a second condenser 9. The liquid outlet pipe of the second condenser 9 is connected to the top of the tower reactor 1. A feeding mechanism is provided at the upper end of the reactor 8. The feeding mechanism includes a feeding tank 11 and a first motor 12. The output end of the first motor 12 is connected to a transmission rod 16. A spiral blade 10 is wound around the transmission rod 16. The transmission rod 16 is a truncated cone structure, and the diameter of the transmission rod 16 gradually increases from left to right. In this way, the automatic transmission of raw materials is realized, and the feeding is convenient.

[0027] In this embodiment, a stirring assembly for adjusting the air pressure to mix the raw materials is installed in the reactor 9, and the stirring assembly includes a second motor 13 installed outside the reactor, and the output end of the second motor 13 is connected to a rotating shaft 14, and a stirring blade 15 is installed on the rotating shaft 14. In this way, the raw materials can be fully and evenly mixed, and the reaction process can be accelerated.

[0028] Working principle of the utility model: In order to realize accurate measurement of the liquid level of the tower bottom of the distillation tower, a liquid communication vessel 3 is added to the original tower bottom 1 equipment. When in use, the liquid level in the liquid communication vessel 3 and the liquid level in the tower bottom 1 are at the same height, and then the radar wave liquid level meter is installed on the top of the liquid communication vessel 3, and the indirect measurement of the liquid level inside the tower bottom 1 is realized by measuring the liquid level of the communication vessel 3, which solves the technical problem that the liquid level of the reboiler of the existing hydrofluoric acid distillation tower cannot be accurately measured.

[0029] Under the premise that no conflict occurs, those skilled in the art may freely combine and superimpose the above-mentioned additional technical features.

[0030] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A device for monitoring the liquid level of a distillation tower reboiler, characterized in that: It includes a tower kettle, the bottom of which is fixedly connected with a liquid outlet pipe, the liquid outlet pipe is connected with a liquid connecting mechanism, the liquid level connecting mechanism includes a liquid level communicating vessel, the liquid level in the liquid level communicating vessel is at the same height as the liquid level in the tower kettle, and a liquid level monitor for monitoring the liquid level information in the liquid level communicating vessel is installed on the liquid level communicating vessel.

2. The device for monitoring the liquid level of a distillation tower reboiler according to claim 1, characterized in that: The liquid level communicating vessel and the tower kettle form a U shape.

3. The device for monitoring the liquid level of a distillation tower reboiler according to claim 1, characterized in that: The liquid level communicating vessel is J-shaped.

4. The device for monitoring the liquid level of a distillation tower reboiler according to claim 1, characterized in that: The liquid level monitor is a radar wave liquid level meter.

5. The device for monitoring the liquid level of a distillation tower reboiler according to claim 1, characterized in that: The tower kettle is fixedly connected with an air outlet pipe, and the air outlet pipe is connected with a first condensing mechanism.

6. The device for monitoring the liquid level of a distillation tower reboiler according to claim 5, characterized in that: The first condensing mechanism includes a first condenser, and a hydrofluoric acid storage tank is connected to a liquid outlet pipe of the first condenser.

7. The device for monitoring the liquid level of a distillation tower reboiler according to claim 1, characterized in that: It also includes a reaction kettle, a second condensing mechanism is installed between the reaction kettle and the tower kettle, the second condensing mechanism includes a second condenser, and the liquid outlet pipe of the second condenser is connected to the top of the tower kettle.

8. The device for monitoring the liquid level of a distillation tower reboiler according to claim 7, characterized in that: A feeding mechanism is provided at the upper end of the reactor, and the feeding mechanism comprises a feeding tank and a first motor. The output end of the first motor is connected to a transmission rod, and a spiral blade is wound around the transmission rod.

9. The device for monitoring the liquid level of a distillation tower reboiler according to claim 8, characterized in that: The transmission rod is in a truncated cone structure, and the diameter of the transmission rod gradually increases from left to right.

10. The device for monitoring the liquid level of a distillation tower reboiler according to claim 7, characterized in that: A stirring assembly for adjusting the air pressure and mixing the raw materials is installed in the reactor. The stirring assembly includes a second motor installed outside the reactor. The output end of the second motor is connected to a rotating shaft, and a stirring blade is installed on the rotating shaft.

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