Fluorite powder feeding device for pyrolysis kiln in anhydrous hydrogen fluoride production

Abstract

This utility model discloses a fluorite powder feeding device for a pyrolysis kiln in the production of anhydrous hydrogen fluoride, belonging to the field of anhydrous hydrogen fluoride production technology. It includes a drying hopper, the lower end of which is connected to the inlet of a screw conveyor. The screw conveyor includes a power unit and a screw ribbon cylinder. The power unit is connected to a screw shaft and is located on one side of the screw ribbon cylinder. The screw shaft enters the interior of the screw ribbon cylinder through the screw shaft, and a screw ribbon is mounted on the screw shaft inside the cylinder. An outlet is located at the top of the screw ribbon cylinder. The screw conveyor not only transports raw materials to the reactor, but also allows the exhaust gas generated by the pyrolysis kiln to enter the outlet through the upper channel of the screw ribbon cylinder, thus serving the functions of raw material transport and exhaust gas discharge. During the material transport process, the tar adhering to the screw ribbon is also cleaned off by the dried fluorite at the bottom of the screw ribbon cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of anhydrous hydrogen fluoride production technology, specifically relating to a fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production. Background Technology

[0002] Inorganic fluoride salts are a crucial class of chemical products in the inorganic salt industry. Commonly used inorganic fluoride salts include fluorite, sodium fluoride, aluminum fluoride, fluorosilicates, and ammonium fluoride salts. In pyrolysis processes, inorganic fluoride salts are primarily decomposed by heating in a furnace. During production, it has been found that introducing inorganic fluoride salts into the pyrolysis furnace at a specific temperature results in better pyrolysis efficiency and higher yields.

[0003] The fluorite raw material feeding and gas guiding device generally uses a common screw conveyor to directly transport the dried fluorite processed in the drying furnace into the pyrolysis kiln. This results in uneven feeding and a lot of dust. The generated exhaust gas is discharged through another gas guiding pipe. The exhaust gas contained in the pyrolysis kiln will accumulate on the wall of the gas guiding pipe, causing blockage over time. Traditional pyrolysis kiln gas guiding pipes are equipped with unblocking devices, but these devices are difficult to operate and manage due to intermittent operation. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production. The drying hopper stores the fluorite raw material, and a certain material layer thickness increases gas resistance, preventing pyrolysis kiln gas from entering the drying furnace along the conveying channel. The screw conveyor not only transports the raw material to the reactor, but also allows the exhaust gas generated by the pyrolysis kiln to enter the outlet through the upper channel of the screw conveyor cylinder, thus serving both raw material transport and exhaust gas removal. During material transport, the tar adhering to the screw conveyor is also cleaned off by the dried fluorite at the bottom of the screw conveyor cylinder.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A fluorite powder feeding device for a pyrolysis kiln in the production of anhydrous hydrogen fluoride includes a drying hopper. The lower end of the drying hopper is connected to the inlet of a screw conveyor. The screw conveyor includes a screw conveyor power unit and a screw ribbon cylinder. The screw conveyor power unit is connected to a screw shaft and is located on one side of the screw ribbon cylinder. The screw shaft enters the interior of the screw ribbon cylinder through the screw ribbon cylinder. A screw ribbon is provided on the screw shaft inside the screw ribbon cylinder. An air outlet is provided above the screw ribbon cylinder.

[0007] Preferably, the power unit of the screw conveyor is an electric motor.

[0008] Preferably, it also includes a disc feeder, the outlet of which is connected to the inlet of the screw conveyor.

[0009] Preferably, the drying hopper is equipped with a weighing module.

[0010] Preferably, the air outlet is connected to an exhaust gas cooling tower or an exhaust gas purification device.

[0011] Preferably, a filter screen is provided inside the air outlet.

[0012] Preferably, the spiral ribbon is provided with spiral ribbon support rods evenly distributed around its circumference.

[0013] Preferably, it also includes a threaded ribbon bushing, wherein the threaded ribbon is connected to the threaded ribbon cylinder through the threaded ribbon bushing.

[0014] Preferably, it also includes a ribbon bushing fixing plate, wherein the ribbon bushing is connected to the ribbon cylinder through the ribbon bushing fixing plate.

[0015] The beneficial effects of this technical solution are as follows:

[0016] I. This utility model provides a fluorite powder feeding device for a pyrolysis kiln in the production of anhydrous hydrogen fluoride. The drying hopper is used for storing fluorite raw materials, and a certain material layer thickness can increase gas resistance, preventing pyrolysis kiln gas from entering the drying furnace along the conveying channel. The screw conveyor not only transports the raw materials to the reactor, but also allows the exhaust gas generated by the pyrolysis kiln to enter the gas outlet through the upper channel of the screw conveyor cylinder, thus playing the role of raw material transportation and exhaust gas discharge. During the material transportation process, the tar adhering to the screw conveyor is also cleaned by the dried fluorite at the bottom of the screw conveyor cylinder.

[0017] II. The fluorite powder feeding device for pyrolysis kilns in the production of anhydrous hydrogen fluoride provided by this utility model has a simple structure, low processing and manufacturing cost, and is easy to promote and use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the inlet structure of the screw conveyor in this utility model;

[0020] The components include: 1. Weighing module; 2. Drying hopper; 3. Screw conveyor power unit; 4. Screw shaft; 5. Screw ribbon cylinder; 6. Screw ribbon support rod; 7. Screw ribbon; 8. Air outlet; 9. Screw ribbon bushing fixing plate; 10. Screw ribbon bushing; 11. Disc feeder. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0022] Example 1

[0023] like Figures 1-2 As shown, this embodiment provides a fluorite powder feeding device for a pyrolysis kiln in the production of anhydrous hydrogen fluoride, including a drying hopper 2. The lower end of the drying hopper 2 is connected to the inlet of a screw conveyor. The screw conveyor includes a screw conveyor power unit 3 and a screw ribbon cylinder 5. The screw conveyor power unit 3 is connected to a screw shaft 4. The screw conveyor power unit 3 is located on one side of the screw ribbon cylinder 5. The screw shaft 4 enters the interior of the screw ribbon cylinder 5 through the screw ribbon cylinder 5. A screw ribbon 7 is provided on the screw shaft 4 inside the screw ribbon cylinder 5. An air outlet 8 is provided above the screw ribbon cylinder 5.

[0024] Example 2

[0025] This embodiment provides a fluorite powder feeding device for a pyrolysis kiln in the production of anhydrous hydrogen fluoride, including a drying hopper 2. The lower end of the drying hopper 2 is connected to the inlet of a screw conveyor. The screw conveyor includes a screw conveyor power unit 3 and a screw ribbon cylinder 5. The screw conveyor power unit 3 is connected to a screw shaft 4. The screw conveyor power unit 3 is located on one side of the screw ribbon cylinder 5. The screw shaft 4 enters the interior of the screw ribbon cylinder 5 through the screw ribbon cylinder 5. A screw ribbon 7 is provided on the screw shaft 4 inside the screw ribbon cylinder 5. An air outlet 8 is provided above the screw ribbon cylinder 5.

[0026] The screw conveyor power unit 3 is an electric motor.

[0027] This also includes a disc feeder 11, the outlet of which is connected to the inlet of the screw conveyor. The disc feeder 11 is prior art and will not be described in detail here.

[0028] The drying hopper 2 is equipped with a weighing module 1. The weighing module 1 is existing technology and will not be described in detail here.

[0029] The air outlet 8 is connected to the exhaust gas cooling tower or the exhaust gas purification device.

[0030] A filter screen is installed inside the air outlet 8.

[0031] Among them, the threaded ribbon 7 is provided with threaded ribbon support rods 6 evenly distributed around its circumference.

[0032] It also includes a threaded sleeve 10, through which the threaded ribbon 7 is connected to the threaded ribbon cylinder 5.

[0033] It also includes a threaded ribbon bushing fixing plate 9, and the threaded ribbon bushing 10 is connected to the threaded ribbon cylinder 5 through the threaded ribbon bushing fixing plate 9.

[0034] In use, the raw material fluorite, dried in the drying furnace, enters the drying hopper 2 for storage. The material level is controlled by adjusting the screw conveyor speed through an interlock between the weighing module 1 and the motor of the screw conveyor power unit, ensuring a certain material layer thickness. This increases gas resistance and prevents pyrolysis kiln gas from entering the drying furnace along the conveying channel. One end of the screw ribbon 7 is connected to the screw shaft 4, and the other end is connected to the screw ribbon bushing 10, which is supported by the screw ribbon bushing fixing plate 9. Screw ribbon support rods 6 are evenly distributed around the circumference of the screw ribbon 7 to increase its rigidity and prevent deformation due to poor rigidity. The dried fluorite is conveyed into the conveying section of the screw ribbon 7 via the screw shaft 4. The material layer thickness must completely cover the bottom of the screw ribbon 7, allowing the dried fluorite to clean itself of the tar adhering to the screw ribbon 7. The lower part of the spiral ribbon cylinder 5 carries the dried fluorite, while the upper part carries the exhaust gas. Some of the exhaust gas adheres to the spiral ribbon 7 and is cleaned by the dried fluorite itself, returning to the pyrolysis kiln along with the dried fluorite. The remaining exhaust gas enters the exhaust gas cooling tower or exhaust gas purification device through the exhaust port 8 at the top of the spiral ribbon cylinder 5.

[0035] The beneficial effects of this technical solution are as follows:

[0036] I. The fluorite powder feeding device for pyrolysis kilns in anhydrous hydrogen fluoride production provided by this utility model includes a drying hopper 2 for storing fluorite raw materials. A certain material layer thickness increases gas resistance, preventing pyrolysis kiln gas from entering the drying furnace along the conveying channel. The screw conveyor not only transports the raw materials to the reactor, but also allows the exhaust gas generated by the pyrolysis kiln to enter the outlet 8 through the upper channel of the screw conveyor cylinder 5, thus serving both raw material transport and exhaust gas removal. During material transport, the tar adhering to the screw belt 7 is also cleaned by the dried fluorite at the lower part of the screw conveyor cylinder 5.

[0037] II. The fluorite powder feeding device for pyrolysis kilns in the production of anhydrous hydrogen fluoride provided by this utility model has a simple structure, low processing and manufacturing cost, and is easy to promote and use.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production, characterized in that: The device includes a drying hopper (2), the lower end of which is connected to the inlet of a screw conveyor. The screw conveyor includes a screw conveyor power unit (3) and a screw ribbon cylinder (5). The screw conveyor power unit (3) is connected to a screw shaft (4). The screw conveyor power unit (3) is located on one side of the screw ribbon cylinder (5). The screw shaft (4) enters the screw ribbon cylinder (5) through the screw ribbon cylinder (5). A screw ribbon (7) is provided on the screw shaft (4) inside the screw ribbon cylinder (5). An air outlet (8) is provided above the screw ribbon cylinder (5).

2. The feed device for fluorite powder of the pyrolysis kiln in the production of anhydrous hydrogen fluoride according to claim 1, characterized in that: The power unit (3) of the screw conveyor is an electric motor.

3. The fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production according to claim 1, characterized in that: It also includes a disc feeder (11), the outlet of which is connected to the inlet of the screw conveyor.

4. The fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production according to claim 1, characterized in that: The drying hopper (2) is equipped with a weighing module (1).

5. The fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production according to claim 1, characterized in that: The outlet (8) is connected to the exhaust gas cooling tower or exhaust gas purification device.

6. The fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production according to claim 1, characterized in that: A filter screen is installed inside the air outlet (8).

7. The fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production according to claim 1, characterized in that: The spiral ribbon (7) is provided with spiral ribbon support rods (6) evenly distributed around its circumference.

8. The fluorite powder feeding device for a pyrolysis kiln in anhydrous hydrogen fluoride production according to claim 1, characterized in that: It also includes a threaded sleeve (10), through which the threaded ribbon (7) is connected to the threaded ribbon cylinder (5).

9. The fluorite powder feeding device for the pyrolysis kiln in the production of anhydrous hydrogen fluoride according to claim 8, characterized in that: It also includes a screw ribbon bushing fixing plate (9), the screw ribbon bushing (10) being connected to the screw ribbon cylinder (5) through the screw ribbon bushing fixing plate (9).

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