Silicon dioxide calcining device with dynamic pressure-stabilizing inert gas protection

Abstract

The utility model relates to a calcining device in a silicon dioxide post-treatment production process, in particular to a silicon dioxide calcining device with dynamic pressure-stabilizing inert gas protection, which comprises a rotary calcining device, a dynamic pressure-stabilizing adjusting device, an inert gas protection device and a vacuumizing mechanism, the rotary calcining device comprises a calcining cylinder driven by a driving mechanism to rotate, the left end and the right end of the calcining cylinder are each provided with a heat insulation filtering structure, extension pipes are fixed to the heat insulation filtering structures, the outer side ends of the extension pipes are detachably connected with sealing covers, and the dynamic pressure stabilizing adjusting device is arranged in the extension pipe on one side. The device can effectively reduce the damage of internal pores of silicon dioxide powder particles in the calcining process, and ensures the balanced distribution probability of dredging pore diameters.

Description

Technical Field

[0001] This utility model relates to calcination equipment and apparatus in the post-processing production of silica, and particularly to a silica calcination apparatus with dynamic pressure-stabilized inert gas protection. Background Technology

[0002] Silica micropowder is produced by chemical synthesis followed by high-temperature calcination. However, existing calcination equipment is either at atmospheric pressure or under vacuum, and the suction force generated by vacuum negative pressure is less than 0.1 MPa. Atmospheric pressure or vacuum calcination is not ideal for effectively clearing the internal pores of silica powder particles and achieving a uniform pore size distribution, resulting in energy waste and a high defect rate.

[0003] Therefore, a calcination device was designed to effectively clear the internal pores of silica powder particles and increase the probability of achieving a balanced pore size distribution. Utility Model Content

[0004] The purpose of this invention is to provide a silica calcination device with dynamic pressure-stabilized inert gas protection. This device can effectively reduce the damage to the internal pores of silica powder particles during the calcination process and ensure the probability of a balanced distribution of unblocked pore size.

[0005] The technical solution of this utility model is as follows: a silicon dioxide calcination device with dynamic pressure stabilization and inert gas protection, including a rotating calcination cylinder device, a dynamic pressure stabilization and adjustment device, an inert gas protection device and a vacuum pumping mechanism. The rotating calcination cylinder device includes a calcination cylinder driven to rotate by a driving mechanism. Both the left and right ends of the calcination cylinder are provided with heat insulation and filtration structures. An extension tube with a sealing cap detachably connected to the outer end is fixed on the heat insulation and filtration structure. The dynamic pressure stabilization and adjustment device is set in the extension tube on one side.

[0006] Furthermore, the dynamic voltage regulation device includes a hollow piston column disposed inside the left extension tube. The outer circular surface of the hollow piston column and the inner diameter surface of the left extension tube in contact form a mirror dynamic seal. A telescopic spring is installed between the left end of the hollow piston column and the left sealing cover.

[0007] Furthermore, a vent pipe is axially installed in the center of the hollow piston column. The right end of the vent pipe is connected to the air outlet located on the right side of the hollow piston column via a piston column micro solenoid valve. The left end of the vent pipe passes through the left side of the hollow piston column and the left side sealing cover in sequence and is connected to the air inlet micro solenoid valve. The vent pipe and the left side sealing cover are in sliding fit.

[0008] Furthermore, the inert gas protection device includes an inert gas cylinder, the outlet of which is connected via a pressure reducing valve to an inlet micro solenoid valve mounted on a sealing cap on the left side.

[0009] Furthermore, a main valve is installed at the outlet of the inert gas cylinder, and a pressure sensor is installed between the pressure reducing valve and the inlet micro solenoid valve.

[0010] Furthermore, the vacuuming mechanism includes a vacuum pump, the input end of which is connected to a micro solenoid valve for venting gas installed on the sealing cover on the right side.

[0011] Furthermore, the heat insulation and filtration structure includes heat insulation short tubes fixed on the left and right ends of the calcining cylinder, and cylindrical heat insulation filter blocks are installed inside the heat insulation short tubes. The extension tube is fixed on the outer end of the heat insulation short tube.

[0012] Furthermore, a circular electric heating block that matches the circumference of the outer circular surface of the calcining cylinder is tightly installed, and a heat insulation layer is installed on the outer circular surface of the circular electric heating block. A wireless temperature sensor with a probe that passes through the heat insulation layer, the circular electric heating block and makes close contact with the outer wall of the rotating calcining cylinder is installed outside the heat insulation layer.

[0013] Furthermore, the sealing caps are spiral sealing caps and are threadedly connected to the outer end of the corresponding extension tube.

[0014] Furthermore, transmission gears are installed on the outer circumference of the extended tube, and the transmission gears rotate with the drive mechanism.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. By designing a protective calcination device with adjustable and stable inert gas pressure when the pressure exceeds 0.1MPa, the damage to the internal pores of silica powder particles during the calcination process can be effectively reduced, the internal pores of silica powder particles can be unblocked, and the probability of a balanced distribution of unblocked pore size can be ensured. This overcomes the shortcomings of existing silica post-processing calcination equipment and plays an important role in improving the quality of silica products and saving energy and reducing consumption.

[0017] 2. This device and calcination method are of great significance for improving the quality of silica products, enhancing the industry's production level, reducing energy consumption and carbon emissions, and achieving sustainable development.

[0018] 3. This device, through the mirror-finished extension tube on the inner wall of the calcining cylinder and equipped with a hollow piston column capable of reciprocating movement, can balance the pressure generated inside the calcining cylinder due to heating or the escape of gas from the silica powder, as well as the pressure changes during the calcination process.

[0019] 4. The device uses a hollow dynamic piston column, an axially mounted vent pipe in the center of the column, and a miniature solenoid valve to inject external inert gas into the heating section of the calcining cylinder.

[0020] 5. This device, with its dynamic hollow piston column and replaceable telescopic spring, can adjust the pressure changes inside the calcining cylinder within a certain range. Attached Figure Description

[0021] Figure 1 This is a working diagram of the silica calcination device with dynamic pressure-stabilized inert gas protection according to this utility model;

[0022] Figure 2 This is a diagram showing the extension state of the telescopic spring for dynamically stabilizing and adjusting the rotary calcining device of this utility model.

[0023] Figure 3 This diagram illustrates the working state of the dynamic pressure-stabilizing and adjusting telescopic spring of the rotary calcining device of this invention, under pressure and compression due to heating and the escape of gas from the inside of the silica powder.

[0024] Figure 4 This is an enlarged view of the heat insulation and filtration structure of this utility model;

[0025] Figure 5 For the present utility model Figure 3 AA section view;

[0026] Figure 6 For the present utility model Figure 3 BB section view;

[0027] Figure 7 This is a block diagram illustrating the control principle of this utility model;

[0028] In the diagram: 1-Inlet micro solenoid valve; 2-Left side sealing cap; 3-Telescopic spring; 4-Transmission gear; 5-Left side extension tube; 6-Vent pipe; 7-Hollow piston column; 8-Left side heat insulation short tube; 9-Calcination cylinder; 10-Circular electric heating block; 11-Insulation layer; 12-Wireless temperature sensor; 13-Right side heat insulation short tube; 14-Right side extension tube; 15-Right side sealing cap; 16-Outlet micro solenoid valve; 17-Piston column micro solenoid valve; 18-Cylindrical heat insulation filter block; 19-Silica powder; 20-Drive mechanism; 21-High pressure high purity nitrogen cylinder; 22-Main valve; 23-Pressure reducing valve; 24-Pressure sensor; 25-Vacuum pump. Detailed Implementation

[0029] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.

[0030] refer to Figures 1 to 7

[0031] A silica calcination apparatus with dynamic pressure stabilization and inert gas protection includes a rotary calcination device, a dynamic pressure stabilization and adjustment device, an inert gas protection device, and a vacuuming mechanism. The rotary calcination device includes a calcination cylinder 9 driven to rotate by a drive mechanism 20. Both the left and right ends of the calcination cylinder 9 are provided with heat insulation and filtration structures. An extension tube with a detachable sealing cap is fixed on the heat insulation and filtration structure. The dynamic pressure stabilization and adjustment device is located in the extension tube 5 on the left side. The vacuuming mechanism is connected to the sealing cap on the right side.

[0032] In this embodiment, the dynamic pressure stabilization and adjustment device includes a hollow piston column 7 made of 310S stainless steel and disposed inside the left-side extension tube 5. The outer circular surface of the hollow piston column 7 forms a mirror-like dynamic seal with the inner diameter surface of the left-side extension tube 2. A telescopic spring 3 is installed between the left end of the hollow piston column 7 and the left-side sealing cover 2. When the pressure inside the calcining cylinder 9 increases due to heating or the escape of gas from the silica powder, the hollow piston column 7 moves towards the left side of the extension tube 5 due to the expansion pressure, and vice versa. The hollow piston column 7 plays a role in stabilizing the internal pressure of the calcining cylinder 9. The telescopic force of the hollow piston column 7 is adjusted by its matching telescopic spring 3. Different pressure settings inside the rotary calcining device can be adjusted by replacing the telescopic spring 3.

[0033] In this embodiment, a vent pipe 6 is axially installed in the center of the hollow piston column 7. The right end of the vent pipe 6 is connected to the air outlet located on the right side of the hollow piston column 9 via the piston column micro solenoid valve 17. The left end of the vent pipe 6 passes through the left side of the hollow piston column 7 and the left side sealing cover 2 in sequence and is connected to the air intake micro solenoid valve 1. The vent pipe 6 and the left side sealing cover 2 are in a sealing sliding fit to facilitate the movement of the hollow piston column 7.

[0034] In this embodiment, the inert gas protection device includes an inert gas cylinder, which is a high-pressure high-purity nitrogen cylinder 21, filled with high-purity nitrogen. The outlet of the high-pressure high-purity nitrogen cylinder 21 is equipped with a main valve 22, which is detachably connected to the inlet micro-solenoid valve 1 via a pressure reducing valve 23. The high-purity nitrogen in the high-pressure high-purity nitrogen cylinder 21 is injected into the calcining cylinder 9 through the pressure reducing valve 23, the inlet micro-solenoid valve 1, and the piston column micro-solenoid valve 17. Once the set pressure is reached, the piston column micro-solenoid valve 17 and the inlet micro-solenoid valve 1 are closed.

[0035] In this embodiment, a pressure sensor 24 is installed between the pressure reducing valve 23 and the intake micro solenoid valve 1, so as to detect the pressure input into the calcining cylinder 9 through the pressure sensor 24.

[0036] In another embodiment, the inert gas can be the high-purity nitrogen gas described above, or other inert gases such as argon or helium used in other protective calcination processes.

[0037] In this embodiment, the vacuum pumping mechanism includes a vacuum pump 25. The input end of the vacuum pump 25 is connected to the exhaust micro solenoid valve 16 installed on the right sealing cover 15. The right sealing cover 15 is provided with an exhaust hole that is connected to the exhaust micro solenoid valve 16.

[0038] In this embodiment, the heat insulation and filtration structure includes heat insulation short tubes fixed to the left and right ends of the calcining cylinder, namely, a left heat insulation short tube 8 and a right heat insulation short tube 13. A cylindrical heat insulation filter block 18 is installed inside both the left and right heat insulation short tubes 8 and 13. An extension tube 5 on the left side is fixed to the left end of the left heat insulation short tube 8, and an extension tube 5 on the right side is fixed to the right end of the right heat insulation short tube 8. The fine pores inside the cylindrical heat insulation filter block 18 can prevent silica powder from overflowing to both sides during calcination, but allow airflow to pass through. Both the left and right heat insulation short tubes 8 and 13 are made of poor thermal conductivity materials. Silica powder is loaded into the calcining cylinder 9 for calcination. The heat insulation short tubes and cylindrical heat insulation filter blocks 18 on both sides of the calcining cylinder 9 can effectively reduce heat transfer between the two ends of the rotating calcining cylinder 9.

[0039] In this embodiment, a circular electric heating block 10 that matches the circumference of the outer circular surface of the calcining cylinder 9 is tightly installed. The circular electric heating block 10 may be composed of two or more arc-shaped point heating blocks, and a heat insulation layer 11 is installed on the outer circular surface of the circular electric heating block 10.

[0040] In this embodiment, the calcination cylinder 9, the left-side epitaxial tube 5, and the right-side epitaxial tube 14 are all made of high-temperature resistant, high-quality, thick-walled 310S stainless steel plates.

[0041] In this embodiment, a wireless temperature sensor 12 with a probe is installed on the outside of the insulation layer 11, passing through the insulation layer 11, the annular electric heating block 10 and in close contact with the outer wall of the calcining cylinder 9, so as to measure the temperature of the calcining cylinder 9.

[0042] In this embodiment, the left sealing cap 2 and the right sealing cap 15 are spiral sealing caps and are threadedly connected to the outer end of the corresponding extension tube. Opening the left sealing cap 2 allows the hollow piston rod 7 to be removed, and opening the right sealing cap 15 allows for the loading or unloading of silica powder.

[0043] In this embodiment, transmission gears 4 are symmetrically installed on the outer circumference of the left-side epitaxial tube 5 and the right-side epitaxial tube 14. The driving mechanism is a rotary driving mechanism, and the transmission gears and the driving mechanism rotate to drive the calcining cylinder 9 to rotate.

[0044] In this embodiment, a control module is also provided. The control module is pre-programmed with settings such as the temperature setting of the rotating calcining cylinder, the charging pressure setting, the speed setting of the drive mechanism, and an automatic operation control program. The input terminals of the control module are electrically connected to the receiver of the wireless temperature sensor and the output terminal of the pressure sensor, respectively. The output terminals of the control module are electrically connected to the input terminals of the annular electric heating block 10, the inlet micro solenoid valve 1, the piston column micro solenoid valve 17, the outlet micro solenoid valve 16, the vacuum pump 25, and the drive mechanism 20, respectively.

[0045] A method for using a silica calcination apparatus with dynamic pressure-stabilized inert gas protection, comprising the following steps:

[0046] 1) Install a telescopic spring with appropriate telescopic force in advance according to the required pressure for calcining silicon dioxide;

[0047] 2) Remove the sealing cover 15 on the right side of the rotary calcining device and take out the cylindrical heat-insulating filter block 18 on the right side of the calcining cylinder 9;

[0048] 3) Measure and load the silica powder to be calcined into the calcination cylinder, and then reload the cylindrical heat-insulating filter block 18 and the sealing cover 15 on the right side in sequence.

[0049] 4) Connect the left external pipe between the high-pressure high-purity nitrogen cylinder 21, the pressure reducing valve 23 and the inlet micro solenoid valve 1 of the rotary calcining device; connect the right external pipe between the outlet micro solenoid valve 16 of the rotary calcining device and the vacuum pump 25.

[0050] 5) Open the intake micro solenoid valve 1, piston column micro solenoid valve 17, and exhaust micro solenoid valve 16 in sequence.

[0051] 6) Turn on vacuum pump 25 to evacuate the above connecting pipes, fittings and the inside of the rotary calcining device;

[0052] 7) When the vacuum set value is reached, close the exhaust micro solenoid valve 16 and vacuum pump 17 in sequence, and disconnect the external pipe connected to the right side of the rotary calcining device.

[0053] 8) Open the main valve 22 of the high-pressure high-purity nitrogen cylinder, open the pressure reducing valve, and fill the calcining cylinder 9 with high-purity nitrogen through the pressure reducing valve 23, the inlet micro solenoid valve 1, and the piston column micro solenoid valve 17.

[0054] 9) When the set pressure value is reached, close the piston column micro solenoid valve 17, the air inlet micro solenoid valve 1, the pressure reducing valve 23, and the main valve 22 on the high-pressure high-purity nitrogen cylinder in sequence to stop the injection of high-purity nitrogen and disconnect the external connection pipe on the left side of the rotary calcining device.

[0055] 10) The drive mechanism 20 and the annular electric heating block 10 are turned on in sequence to heat the calcining cylinder and achieve uniform rotational heating and calcination of the silicon dioxide inside the calcining cylinder; when the set calcination temperature is reached, the set temperature is maintained for calcination, and the temperature measurement data is transmitted to the control module by the wireless temperature sensor 12, and the control module automatically controls the temperature according to the set temperature.

[0056] 11) When the pressure inside the calcining cylinder 9 exceeds the set spring force of the telescopic spring 3 due to heating or gas escape from the silica powder, the hollow piston column 7 moves to the left side of the extension tube 5 port, and vice versa, and always maintains stable calcination within the set pressure range.

[0057] 12) When the calcination time is reached, turn off the annular electric heating block 10 and the drive mechanism 20 in sequence;

[0058] 13) When the temperature drops to room temperature, open the micro solenoid valve 16 on the right side of the rotary calcining device to release the pressure inside the rotary calcining device.

[0059] 14) Unscrew the sealing cover on the right side of the rotary calcining device 15 and remove the qualified calcined silicon dioxide;

[0060] 15) Clean the inside of the calcining cylinder 9, reinstall the cylindrical heat insulation filter block 18 and the sealing cover 15 on the right side, close the micro solenoid valve 16 on the right side, and prepare for the next cycle of calcination.

[0061] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting or welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0062] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0063] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0064] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A silica calcining apparatus with dynamic pressure-stabilized inert gas protection, comprising a rotary calcining cylinder apparatus, a dynamic pressure-stabilized adjustment apparatus, an inert gas protection apparatus, and a vacuum-pumping mechanism, characterized in that, The rotating calcination cylinder device comprises a calcination cylinder rotating driven by a driving mechanism, heat insulation filtering structures arranged at left and right ends of the calcination cylinder, outer extension tubes fixed on the heat insulation filtering structures and having detachable sealing covers connected to outer ends thereof, and a dynamic stable pressure adjusting device arranged in the outer extension tube on one side.

2. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 1, characterized in that, The dynamic stable pressure adjusting device comprises a hollow piston column arranged in the outer extension tube on the left side, a mirror surface dynamic seal being formed between an outer circular surface of the hollow piston column and an inner diameter surface of the outer extension tube on the left side, and an expansion spring installed between a left end of the hollow piston column and the sealing cover on the left side.

3. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 2, characterized in that, An air pipe is installed on a central axis of the hollow piston column, a right end of the air pipe is connected to an air outlet arranged on the right side of the hollow piston column through a piston column micro electromagnetic valve, a left end of the air pipe is connected to an air inlet micro electromagnetic valve in sequence through the left side of the hollow piston column, the sealing cover on the left side and the air inlet micro electromagnetic valve, and the air pipe and the sealing cover on the left side are in sliding fit.

4. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 1, 2 or 3, characterized in that, The inert gas protection device comprises an inert gas bottle, an outlet of the inert gas bottle is connected to the air inlet micro electromagnetic valve installed on the sealing cover on the left side through a pressure reducing valve.

5. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 4, characterized in that, A total valve is installed at the outlet of the inert gas bottle, and a pressure sensor is installed between the pressure reducing valve and the air inlet micro electromagnetic valve.

6. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 1, 2, 3 or 5, characterized in that, The vacuum pumping mechanism comprises a vacuum pump, an input end of the vacuum pump is connected to the air outlet micro electromagnetic valve installed on the sealing cover on the right side.

7. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 1, 2, 3 or 5, characterized in that, The heat insulation filtering structure comprises heat insulation short pipes fixed on left and right ends of the calcination cylinder, cylindrical heat insulation filtering blocks are installed in the heat insulation short pipes, and the outer extension tubes are fixed on outer ends of the heat insulation short pipes.

8. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 1, 2, 3 or 5, characterized in that, A circular ring electric heating block abutting the outer circular surface of the calcination cylinder is installed, a heat preservation layer is installed on an outer circular surface of the circular ring electric heating block, and a probe is installed outside the heat preservation layer, a wireless temperature sensor in sequence through the heat preservation layer, the circular ring electric heating block and the outer wall of the rotating calcination cylinder is in close contact.

9. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 1, 2, 3 or 5, characterized in that, The sealing covers are screw sealing covers and are in threaded connection with the outer ends of the corresponding outer extension tubes.

10. The silica calcining apparatus with dynamic stabilized inert gas protection according to claim 1, 2, 3 or 5, characterized in that, Transmission gears are installed on outer circumferences of the outer extension tubes, and the transmission gears are in rotary transmission with the driving mechanism.

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