Hydrogen fluoride pre-reactor

Abstract

The present application relates to hydrogen fluoride technical field, specifically to a kind of hydrogen fluoride pre-reactor, concentrated sulfuric acid and fluorite are added in the way of subsection, by setting feeding cylinder and mixing barrel, feeding cylinder is used to add fluorite, mixing barrel is used to add concentrated sulfuric acid, since the main body diameter of feeding cylinder is less than the main body diameter of mixing barrel, when fluorite added in feeding cylinder is transported to mixing barrel, difference is generated, this structure can prevent concentrated sulfuric acid added in mixing barrel from flowing back to feeding cylinder, by setting first gas outlet and second gas outlet, hydrogen fluoride gas generated in rotary reaction furnace flows to mixing pre-reaction cylinder and re-mixing reaction cylinder, and is discharged through first gas outlet and second gas outlet, hydrogen fluoride gas flow process can provide the heat source required for the reaction between fluorite and concentrated sulfuric acid for mixing pre-reaction cylinder and re-mixing reaction cylinder, to promote the full reaction between fluorite and concentrated sulfuric acid in mixing pre-reaction cylinder and re-mixing reaction cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fluoride, in particular to a hydrogen fluoride pre-reactor. Background Art

[0002] During the hydrogen fluoride production process, the chemical reaction between fluorite and sulfuric acid is an endothermic reaction. The generated calcium sulfate will block the contact between fluorite particles and sulfuric acid, resulting in low production efficiency. At present, hydrogen fluoride production plants use pre-reactors to improve production efficiency. The main function of the pre-reactor is to fully mix fluorite and sulfuric acid, to ensure that every fluorite particle is surrounded by sulfuric acid, and to allow the acid molecules to penetrate into the fluorite molecules, so that the materials can smoothly produce chemical reactions and improve production efficiency. CN202164111U and CN112263983A disclose hydrogen fluoride pre-reactor technology, which solves problems such as short bearing service life, frequent equipment inspection and maintenance, and difficult disassembly and installation.

[0003] In the prior art, sulfuric acid, a raw material in the hydrogen fluoride reaction, is highly corrosive. Therefore, the existing hydrogen fluoride pre-reactor structure basically requires the use of corrosion-resistant materials, such as C-276. However, this material is very expensive, and the use of this corrosion-resistant material in the pre-reactor leads to increased costs. In addition, the existing hydrogen fluoride pre-reactor still needs to be improved in terms of the adequacy of mixing fluorite and sulfuric acid. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a hydrogen fluoride pre-reactor which has low cost and can fully mix and react fluorite and sulfuric acid.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A hydrogen fluoride pre-reactor, comprising a hydrogen fluoride pre-reactor body, wherein the X-direction end of the hydrogen fluoride pre-reactor body is connected to a rotary reactor, and the pre-reactor body comprises a feeding cylinder, a mixing cylinder, a mixing pre-reaction cylinder, and a re-mixing reaction cylinder sequentially connected along the X-direction;

[0007] The main axes of the feeding cylinder, mixing cylinder, pre-mixing reaction cylinder and re-mixing reaction cylinder are all in the X direction, the axes of the feeding cylinder, mixing cylinder and pre-mixing reaction cylinder coincide with each other, and the axis of the pre-mixing reaction cylinder is located below the re-mixing reaction cylinder;

[0008] The X-direction end of the re-mixing reaction cylinder is sealedly connected to one end of the rotary reactor;

[0009] The diameters of the feeding cylinder, mixing cylinder, pre-mixing reaction cylinder and re-mixing reaction cylinder increase in sequence;

[0010] The material of the feeding cylinder is carbon steel;

[0011] The material of the mixing cylinder, mixing pre-reaction cylinder and re-mixing reaction cylinder is C-276;

[0012] A fluorite feed port is provided on the upper portion of the X-direction reverse end of the feeding cylinder; a concentrated sulfuric acid feed port is provided on the upper portion of the X-direction reverse end of the mixing cylinder;

[0013] The pre-reactor further includes a stirring main shaft and a driving device for driving the stirring main shaft to rotate. The stirring main shaft is provided through the feeding cylinder, the mixing cylinder, the mixing pre-reaction cylinder and the re-mixing reaction cylinder. The axis of the stirring main shaft coincides with the main axis of the feeding cylinder. The circumferential surface of the stirring main shaft is provided with stirring blades.

[0014] The upper portion of the pre-mixing reaction cylinder is provided with a first air outlet, and the upper portion of the re-mixing reaction cylinder is provided with a second air outlet.

[0015] Furthermore, in the above hydrogen fluoride pre-reactor, the X-direction length of the mixing cylinder is longer than the length of the mixing pre-reaction cylinder, and the length of the mixing pre-reaction cylinder is shorter than the length of the re-mixing reaction cylinder.

[0016] Furthermore, in the above hydrogen fluoride pre-reactor, the diameter of the first gas outlet is smaller than the diameter of the second gas outlet.

[0017] Furthermore, in the above-mentioned hydrogen fluoride pre-reactor, the stirring blade includes a feeding section, a mixing section, a mixing pre-reaction section and a re-mixing reaction section arranged in sequence along the X direction;

[0018] The feeding section is located in the feeding cylinder and is a spiral blade; the material of the spiral blade is carbon steel;

[0019] The mixing section is located in the mixing cylinder, and the mixing section is a first plate-shaped blade;

[0020] The mixing pre-reaction section is located in the mixing pre-reaction cylinder, and the mixing pre-reaction section is a second plate-shaped blade;

[0021] The re-mixing reaction section is located in the re-mixing reaction cylinder, and the re-mixing reaction section is the third plate-shaped blade; the first plate-shaped blade, the second plate-shaped blade and the third plate-shaped blade are all made of C-276 material.

[0022] Furthermore, in the above hydrogen fluoride pre-reactor, the angles between the first plate-shaped blade and the axis of the stirring shaft, the angles between the second plate-shaped blade and the axis of the stirring shaft, and the angles between the third plate-shaped blade and the axis of the stirring shaft decrease in sequence.

[0023] Furthermore, in the above-mentioned hydrogen fluoride pre-reactor, the angle between the first plate-shaped blade and the axis of the stirring shaft is 58-62 degrees, the angle between the second plate-shaped blade and the axis of the stirring shaft is 48-52 degrees, and the angle between the third plate-shaped blade and the axis of the stirring shaft is 43-47 degrees.

[0024] Furthermore, in the above hydrogen fluoride pre-reactor, the lengths of the first plate-shaped blades, the second plate-shaped blades and the third plate-shaped blades increase sequentially.

[0025] Furthermore, in the above hydrogen fluoride pre-reactor, the width of the third plate-shaped blade is greater than the width of the second plate-shaped blade.

[0026] Furthermore, in the above hydrogen fluoride pre-reactor, a conical cylinder is provided in the main body of the feeding cylinder, the conical cylinder coincides with the main body axis of the feeding cylinder, and the narrow end of the conical cylinder faces the X-direction end.

[0027] Furthermore, in the above-mentioned hydrogen fluoride pre-reactor, the driving device is connected to the X-direction reverse end of the stirring main shaft, the X-direction end of the stirring main shaft is connected to a shaft sleeve, and the X-direction end of the shaft sleeve is provided with a step extending outward.

[0028] The beneficial effects of the present invention are as follows: the concentrated sulfuric acid and fluorite are added in stages, and a feeding cylinder and a mixing cylinder are provided. The feeding cylinder is used to add fluorite, and the mixing cylinder is used to add concentrated sulfuric acid. Since the main body diameter of the feeding cylinder is smaller than the main body diameter of the mixing cylinder, a drop is generated when the fluorite added in the feeding cylinder is transported to the mixing cylinder. This structure can prevent the concentrated sulfuric acid added in the mixing cylinder from flowing back into the feeding cylinder. Therefore, a relatively low-cost carbon steel material can be selected for the material selection of the feeding cylinder, thereby reducing costs. The concentrated sulfuric acid and fluorite are kept in a constant temperature and humidity. The gas passes through the three-stage stirring of the mixing drum, the mixing pre-reaction drum and the re-mixing reaction drum to fully mix and react. By setting the first gas outlet and the second gas outlet, the hydrogen fluoride gas generated in the rotary reactor flows to the mixing pre-reaction drum and the re-mixing reaction drum, and is discharged through the first gas outlet and the second gas outlet. The flow process of the hydrogen fluoride gas provides the mixing pre-reaction drum and the re-mixing reaction drum with the heat source required for the reaction of fluorite and concentrated sulfuric acid, thereby promoting the full reaction between fluorite and concentrated sulfuric acid in the mixing pre-reaction drum and the re-mixing reaction drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A lateral structural cross-sectional view of a hydrogen fluoride pre-reactor according to a specific embodiment of the present invention;

[0030] Figure 2 for Figure 1 A magnified view of part A;

[0031] Figure 3 for Figure 1 A magnified view of part B;

[0032] Figure 4 for Figure 1 Magnified view of part C;

[0033] Description of labels:

[0034] 1. Feeding cylinder; 11. Fluorite feeding port; 12. Conical cylinder;

[0035] 2. Mixing drum; 21. Concentrated sulfuric acid feed port;

[0036] 3. Mixing pre-reaction cylinder; 31. First air outlet;

[0037] 4. Re-mixing reaction cylinder; 41. Second gas outlet;

[0038] 5. Stirring main shaft; 51. Driving device; 52. Stirring blade; 521. Feeding section; 522. Mixing section; 523. Mixing pre-reaction section; 524. Re-mixing reaction section; 53. Shaft sleeve. DETAILED DESCRIPTION

[0039] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0040] Please refer to Figures 1 to 4 The specific embodiment of the present invention relates to a hydrogen fluoride pre-reactor, comprising a hydrogen fluoride pre-reactor body, wherein the X-direction end of the hydrogen fluoride pre-reactor body is connected to a rotary reactor, and the pre-reactor body comprises a feeding cylinder 1, a mixing cylinder 2, a mixing pre-reaction cylinder 3, and a re-mixing reaction cylinder 4 connected in sequence along the X-direction;

[0041] The main axes of the feeding cylinder 1, the mixing cylinder 2, the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4 are all in the X direction, the axes of the feeding cylinder 1, the mixing cylinder 2 and the mixing pre-reaction cylinder 3 coincide with each other, and the axis of the mixing pre-reaction cylinder 3 is located below the re-mixing reaction cylinder 4;

[0042] The X-direction end of the re-mixing reaction cylinder 4 is sealed and connected to one end of the rotary reactor;

[0043] The diameters of the feeding cylinder 1, the mixing cylinder 2, the pre-mixing reaction cylinder 3 and the re-mixing reaction cylinder 4 increase in sequence;

[0044] The material of the feeding cylinder 1 is carbon steel;

[0045] The material of the mixing cylinder 2, the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4 is C-276;

[0046] The upper portion of the X-direction reverse end of the feeding cylinder 1 is provided with a fluorite feeding port 11; the upper portion of the X-direction reverse end of the mixing cylinder 2 is provided with a concentrated sulfuric acid feeding port 21;

[0047] The pre-reactor further includes a stirring main shaft 5 and a driving device 51 for driving the stirring main shaft 5 to rotate. The stirring main shaft 5 is provided through the feeding cylinder 1, the mixing cylinder 2, the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4. The axis of the stirring main shaft 5 coincides with the main axis of the feeding cylinder 1. The circumferential surface of the stirring main shaft 5 is provided with stirring blades 52.

[0048] A first air outlet 31 is provided at the upper portion of the pre-mixing reaction cylinder 3 , and a second air outlet 41 is provided at the upper portion of the re-mixing reaction cylinder 4 .

[0049] In the above embodiments, it should be noted that the X direction may be defined as a horizontal direction, or a direction with an angle less than 3 degrees with the horizontal direction.

[0050] In the above embodiments, the driving device 51 may be any power combination that can be used to drive the stirring main shaft 5 to rotate, for example, a reduction motor is connected to the stirring main shaft 5 through transmission.

[0051] In the above embodiment, the outer surface of the portion of the stirring shaft 5 that contacts the concentrated sulfuric acid is coated with C-276 material.

[0052] In the above embodiment, concentrated sulfuric acid and fluorite are added in stages, and a feeding barrel 1 and a mixing barrel 2 are set. The feeding barrel 1 is used to add fluorite, and the mixing barrel 2 is used to add concentrated sulfuric acid. Since the main body diameter of the feeding barrel 1 is smaller than the main body diameter of the mixing barrel 2, a drop is generated when the fluorite added to the feeding barrel 1 is transported to the mixing barrel 2. This structure can prevent the concentrated sulfuric acid added to the mixing barrel 2 from flowing back into the feeding barrel 1. Therefore, a lower-cost carbon steel material can be selected for the material selection of the feeding barrel 1 to reduce costs. The concentrated sulfuric acid and fluorite are stirred in three stages in sequence through the mixing barrel 2, the mixing pre-reaction barrel 3 and the re-mixing reaction barrel 4 to fully mix and react.

[0053] In the above embodiment, the X-direction end of the mixing reaction tube 4 is connected to the rotary reactor. Figure 1 Not shown, since the hydrogen fluoride pre-reactor involved in the present invention is not provided with a heating device, and the reaction process of fluorite and concentrated sulfuric acid requires a large amount of heat absorption, and the rotary reactor itself is provided with a heating device, hydrogen fluoride gas with a large amount of heat will be generated in the rotary reactor. The present invention provides a first gas outlet 31 and a second gas outlet 41 to allow the hydrogen fluoride gas generated in the rotary reactor to flow to the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4, and be discharged through the first gas outlet 31 and the second gas outlet 41. The flow process of hydrogen fluoride gas will provide the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4 with the heat source required for the reaction of fluorite and concentrated sulfuric acid, thereby promoting a full reaction between fluorite and concentrated sulfuric acid in the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4.

[0054] As an optional embodiment, the X-direction length of the mixing cylinder 2 is longer than the length of the pre-mixing reaction cylinder 3 , and the length of the pre-mixing reaction cylinder 3 is shorter than the length of the re-mixing reaction cylinder 4 .

[0055] In this embodiment, the diameter of the first air outlet 31 is smaller than the diameter of the second air outlet 41 .

[0056] In the above embodiment, since the volume of the pre-mixing reaction tube 3 is smaller than that of the re-mixing reaction tube 4, the reaction between fluorite and concentrated sulfuric acid mainly takes place in the re-mixing reaction tube 4. Therefore, the diameter of the second gas outlet 41 is larger, so that more heat carried by the hydrogen fluoride gas flowing from the rotary reactor will remain in the re-mixing reaction tube 4, providing more heat for the endothermic reaction in the re-mixing reaction tube 4.

[0057] As an optional embodiment, the stirring blade 52 includes a feeding section 521, a mixing section 522, a mixing pre-reaction section 523 and a re-mixing reaction section 524 arranged in sequence along the X direction;

[0058] The feeding section 521 is located in the feeding barrel 1 and is a spiral blade; the material of the spiral blade is carbon steel;

[0059] The mixing section 522 is located in the mixing barrel 2 and is a first plate-shaped blade;

[0060] The mixing pre-reaction section 523 is located in the mixing pre-reaction cylinder 3, and the mixing pre-reaction section 523 is a second plate-shaped blade;

[0061] The re-mixing reaction section 524 is located in the re-mixing reaction tube 4, and the re-mixing reaction section 524 is a third plate-shaped blade; the first plate-shaped blade, the second plate-shaped blade and the third plate-shaped blade are all made of C-276 material.

[0062] In the above embodiment, the feeding section 521 is designed as a spiral blade. Since this section does not need to be mixed with concentrated sulfuric acid, the design of the spiral blade can guide the fluorite fed into the feeding barrel 1 to the mixing area evenly and stably; and the mixing section 522, the mixing pre-reaction section 523 and the re-mixing reaction section 524 are all designed as plate-shaped blades, which can enhance the stirring force when the concentrated sulfuric acid and fluorite are mixed.

[0063] As an optional embodiment, the angles between the first plate-shaped blade and the axis of the stirring main shaft 5, the angles between the second plate-shaped blade and the axis of the stirring main shaft 5, and the angles between the third plate-shaped blade and the axis of the stirring main shaft 5 decrease in sequence.

[0064] Preferably, the angle between the first plate-shaped blade and the axis of the stirring main shaft 5 is 58-62 degrees, the angle between the second plate-shaped blade and the axis of the stirring main shaft 5 is 48-52 degrees, and the angle between the third plate-shaped blade and the axis of the stirring main shaft 5 is 43-47 degrees.

[0065] In the above embodiment, since the smaller the angle between the plate-shaped blade and the axis of the stirring main shaft 5, the greater the stirring force, the speed of feeding in the X direction is reduced, the design of the angle between the axis of the first plate-shaped blade and the stirring main shaft 5, the angle between the axis of the second plate-shaped blade and the stirring main shaft 5, and the angle between the axis of the third plate-shaped blade and the stirring main shaft 5 decreases in sequence, so that the stirring force of the material gradually increases and the pushing speed gradually decreases, so that the material is fully mixed and reacted in the pre-mixing reaction tube and the re-mixing reaction tube.

[0066] As an optional embodiment, a conical cylinder 12 is provided in the main body of the feeding cylinder 1 , the conical cylinder 12 coincides with the main body axis of the feeding cylinder 1 , and the narrow end of the conical cylinder 12 faces the X-direction end.

[0067] In the above embodiment, fluorite is introduced into the mixing barrel 2 in the X direction through the tapered barrel 12, filling the inner cavity at the narrow end of the tapered barrel 12 to form a material seal, preventing hydrogen fluoride gas from entering the feeding barrel 1 and corroding the carbon steel feeding barrel 1.

[0068] As an optional embodiment, the driving device 51 is connected to the X-direction reverse end of the stirring main shaft 5, the X-direction end of the stirring main shaft 5 is connected to a shaft sleeve 53, and the X-direction end of the shaft sleeve 53 is provided with a step extending outward.

[0069] In the above embodiment, since the shaft sleeve 53 is a wearing part, it is installed with the step facing outwards for easy replacement.

[0070] Example 1

[0071] Please refer to Figures 1 to 4A hydrogen fluoride pre-reactor comprises a hydrogen fluoride pre-reactor body, the X-direction end of the hydrogen fluoride pre-reactor body is connected to a rotary reactor, and comprises a feeding cylinder 1, a mixing cylinder 2, a mixing pre-reaction cylinder 3 and a re-mixing reaction cylinder 4 connected in sequence along the X-direction; the main axes of the feeding cylinder 1, the mixing cylinder 2, the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4 are all in the X-direction, the axes of the feeding cylinder 1, the mixing cylinder 2 and the mixing pre-reaction cylinder 3 coincide, and the axis of the mixing pre-reaction cylinder 3 is located below the re-mixing reaction cylinder 4; the X-direction end of the re-mixing reaction cylinder 4 is sealed with one end of the rotary reactor; the diameters of the feeding cylinder 1, the mixing cylinder 2, the mixing pre-reaction cylinder 3 and the re-mixing reaction cylinder 4 increase in sequence; the material of the feeding cylinder 1 is carbon steel ; The material of the mixing barrel 2, the mixing pre-reaction barrel 3 and the re-mixing reaction barrel 4 is C-276 ha material; the upper part of the X-direction reverse end of the feeding barrel 1 is provided with a fluorite feeding port 11; the upper part of the X-direction reverse end of the mixing barrel 2 is provided with a concentrated sulfuric acid feeding port 21; the pre-reactor also includes a stirring main shaft 5 and a driving device 51 for driving the stirring main shaft 5 to rotate, the stirring main shaft 5 is passed through the feeding barrel 1, the mixing barrel 2, the mixing pre-reaction barrel 3 and the re-mixing reaction barrel 4, the axis of the stirring main shaft 5 coincides with the main body axis of the feeding barrel 1, and the circumferential surface of the stirring main shaft 5 is provided with stirring blades 52; the upper part of the mixing pre-reaction barrel 3 is provided with a first air outlet 31, and the upper part of the re-mixing reaction barrel 4 is provided with a second air outlet 41.

[0072] The X-axis length of the mixing cylinder 2 is longer than that of the pre-mixing reaction cylinder 3 , and the pre-mixing reaction cylinder 3 is shorter than that of the re-mixing reaction cylinder 4 . The diameter of the first air outlet 31 is smaller than that of the second air outlet 41 . The stirring blade 52 includes a feeding section 521, a mixing section 522, a mixing pre-reaction section 523, and a re-mixing reaction section 524, which are arranged in sequence along the X direction. The feeding section 521 is located in the feeding barrel 1 and is a spiral blade; the spiral blade is made of carbon steel; the mixing section 522 is located in the mixing barrel 2 and is a first plate-shaped blade; the mixing pre-reaction section 523 is located in the mixing pre-reaction barrel 3 and is a second plate-shaped blade; the re-mixing reaction section 524 is located in the re-mixing reaction barrel 4 and is a third plate-shaped blade; the first plate-shaped blade, the second plate-shaped blade, and the third plate-shaped blade are all made of C-276. The angles between the first plate-shaped blade and the axis of the stirring main shaft 5, the second plate-shaped blade, and the third plate-shaped blade decrease in sequence. The angle between the first plate-shaped blade and the axis of the stirring main shaft 5 is 60 degrees, the angle between the second plate-shaped blade and the axis of the stirring main shaft 5 is 50 degrees, and the angle between the third plate-shaped blade and the axis of the stirring main shaft 5 is 45 degrees. The lengths of the first plate-shaped blade, the second plate-shaped blade and the third plate-shaped blade increase successively. The width of the third plate-shaped blade is greater than the width of the second plate-shaped blade. A conical barrel 12 is provided in the main body of the feeding barrel 1, and the conical barrel 12 coincides with the main axis of the feeding barrel 1, and the narrow end of the conical barrel 12 faces the X-direction end. The driving device 51 is connected to the X-direction reverse end of the stirring main shaft 5, and the X-direction end of the stirring main shaft 5 is connected to a shaft sleeve 53, and the X-direction end of the shaft sleeve 53 is provided with a step extending outward.

[0073] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the scope of the present invention's patent protection.

Claims

1. A hydrogen fluoride prereactor, comprising a hydrogen fluoride prereactor body, wherein the X-end of the hydrogen fluoride prereactor body is connected to a rotary reactor, characterized in that: It includes a feeding cylinder, a mixing cylinder, a mixing pre-reaction cylinder and a re-mixing reaction cylinder connected in sequence along the X direction; the X direction is the horizontal direction, or a direction with an angle of less than 3 degrees to the horizontal direction; The main axes of the feeding cylinder, mixing cylinder, pre-mixing reaction cylinder and re-mixing reaction cylinder are all in the X direction, the axes of the feeding cylinder, mixing cylinder and pre-mixing reaction cylinder coincide with each other, and the axis of the pre-mixing reaction cylinder is located below the re-mixing reaction cylinder; The X-direction end of the re-mixing reaction cylinder is sealedly connected to one end of the rotary reactor; The diameters of the feeding cylinder, mixing cylinder, pre-mixing reaction cylinder and re-mixing reaction cylinder increase in sequence; The material of the feeding cylinder is carbon steel; The mixing cylinder, pre-mixing reaction cylinder and re-mixing reaction cylinder are made of C-276 Hastelloy alloy; A fluorite feed port is provided on the upper portion of the X-direction reverse end of the feeding cylinder; a concentrated sulfuric acid feed port is provided on the upper portion of the X-direction reverse end of the mixing cylinder; The pre-reactor further includes a stirring main shaft and a driving device for driving the stirring main shaft to rotate. The stirring main shaft is provided through the feeding cylinder, the mixing cylinder, the mixing pre-reaction cylinder and the re-mixing reaction cylinder. The axis of the stirring main shaft coincides with the main axis of the feeding cylinder. The circumferential surface of the stirring main shaft is provided with stirring blades. The upper portion of the pre-mixing reaction cylinder is provided with a first air outlet, and the upper portion of the re-mixing reaction cylinder is provided with a second air outlet; The stirring blade comprises a feeding section, a mixing section, a mixing pre-reaction section and a re-mixing reaction section arranged in sequence along the X direction; The feeding section is located in the feeding cylinder and is a spiral blade; the material of the spiral blade is carbon steel; The mixing section is located in the mixing cylinder, and the mixing section is a first plate-shaped blade; The mixing pre-reaction section is located in the mixing pre-reaction cylinder, and the mixing pre-reaction section is a second plate-shaped blade; The re-mixing reaction section is located in the re-mixing reaction cylinder, and the re-mixing reaction section is a third plate-shaped blade; The angles between the first plate-shaped blade and the axis of the stirring main shaft, the angles between the second plate-shaped blade and the axis of the stirring main shaft, and the angles between the third plate-shaped blade and the axis of the stirring main shaft decrease in sequence.

2. The hydrogen fluoride prereactor according to claim 1, characterized in that The X-direction length of the mixing cylinder is longer than the length of the pre-mixing reaction cylinder, and the length of the pre-mixing reaction cylinder is shorter than the length of the re-mixing reaction cylinder.

3. The hydrogen fluoride pre-reactor according to claim 1, characterized in that The diameter of the first air outlet is smaller than the diameter of the second air outlet.

4. The hydrogen fluoride prereactor according to claim 1, characterized in that The first plate-shaped blade, the second plate-shaped blade and the third plate-shaped blade are all made of C-276 Hastelloy alloy.

5. The hydrogen fluoride prereactor according to claim 4, characterized in that The angle between the first plate-shaped blade and the axis of the stirring main shaft is 58-62 degrees, the angle between the second plate-shaped blade and the axis of the stirring main shaft is 48-52 degrees, and the angle between the third plate-shaped blade and the axis of the stirring main shaft is 42-47 degrees.

6. The hydrogen fluoride prereactor according to claim 4, characterized in that The lengths of the first plate-shaped blade, the second plate-shaped blade and the third plate-shaped blade increase sequentially.

7. The hydrogen fluoride prereactor according to claim 4, characterized in that The width of the third plate-shaped blade is greater than the width of the second plate-shaped blade.

8. The hydrogen fluoride pre-reactor according to claim 1, characterized in that A conical cylinder is provided in the main body of the feeding cylinder. The conical cylinder coincides with the main body axis of the feeding cylinder, and the narrow end of the conical cylinder faces the X-direction end.

9. The hydrogen fluoride pre-reactor according to claim 1, characterized in that The driving device is connected to the X-direction reverse end of the stirring main shaft, the X-direction end of the stirring main shaft is connected to a shaft sleeve, and the X-direction end of the shaft sleeve is provided with a step extending outward.

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