A pressurized fluidized roasting system

Abstract

A pressurized fluidized bed roasting system is disclosed, comprising a fluidized bed furnace tube and a pressurized roasting device. The fluidized bed furnace tube has a first fluidized gas inlet at its lower end and a first fluidized gas outlet at its upper end. The pressurized roasting device is arranged parallel to the fluidized bed furnace tube, and an opening communicating with the inner cavity of the pressurized roasting device is formed on the inner wall of the fluidized bed furnace tube, with a movable baffle at the opening. The pressurized roasting device has a second fluidized gas inlet at its lower end and a second fluidized gas outlet at its upper end. The pressurization method of the pressurized roasting device is to increase the gas flow rate or change the device volume. This pressurized fluidized bed roasting system provides preheating of materials in the fluidized bed furnace tube before feeding them into the pressurized roasting tube for pressurized roasting, shortening the roasting time, improving roasting efficiency and resource utilization, and solving the problem of long roasting times in conventional fluidized bed roasting processes.

Description

Technical Field

[0001] This utility model relates to a roasting system, specifically a pressurized fluidized bed roasting system, and belongs to the field of fluidized bed roasting technology. Background Technology

[0002] Vanadium is an important strategic material. In recent years, the development of vanadium products both domestically and internationally, the expansion of vanadium applications, and the needs of economic development have increased the demand for vanadium, causing its price to rise continuously and sparking interest in building vanadium extraction plants across the country. However, due to various drawbacks of current vanadium extraction technologies, such as significant differences in raw materials, excessively long process flows, low vanadium recovery rates (mostly below 60%), high costs, and environmental unfriendliness, vanadium companies' profits are affected, their survival is threatened, and, more importantly, vanadium resources are wasted. Therefore, developing efficient, environmentally friendly, and economically feasible new vanadium extraction processes based on the characteristics of the raw materials is receiving increasing attention.

[0003] Vanadium shale ore is a low-grade vanadium-bearing resource with extremely abundant reserves in my country. Vanadium in vanadium shale ore typically exists in isomorphous, adsorbed, or independent mineral forms, and its occurrence directly determines the ease and method of vanadium extraction. In most parts of my country, vanadium shale ore exists in isomorphous form, where V(III) isomorphously replaces Al(III) in mica group minerals, or vanadium oxide (VO2) isomorphously replaces Al(III) in the crystal lattice with Mg(II) and Fe(II) to form vanadium-bearing mica. There are many vanadium refining processes. The techniques for extracting vanadium compounds from vanadium-bearing raw materials vary depending on the raw material. Generally, the methods used to extract vanadium from ores or other vanadium-bearing raw materials include pyrometallurgical processes, pyrometallurgical-hydrometallurgical combined processes, and hydrometallurgical processes. The extraction of vanadium resources from vanadium shale ore generally adopts a pyrometallurgical-hydrometallurgical combined process. First, high-temperature roasting is used to destroy the crystal lattice structure, and then the vanadium element is extracted into an acidic solution.

[0004] my country is rich in vanadium resources. The vanadium reserves (calculated as V₂O₅) in coal shale reach 117.97 million tons, of which vanadium reserves in coal shale containing more than 0.5% V₂O₅ amount to 77.07 million tons. This reserve is comparable to the total reserves of major vanadium-rich countries abroad. Coal shale is a low-quality, early-generation coal, mostly characterized by high ash content, low calorific value, dense structure, high ignition point, and difficulty in complete combustion. Its calorific value is generally between 6000 and 32000 kJ / kg. Besides containing 10%–30% carbon, it also contains 0.2%–2% vanadium and other non-ferrous metals such as molybdenum and nickel, as well as large amounts of silicates, phosphorus, aluminum, and iron. As a low-quality energy source, it is currently rarely used and is only mined as a separate vanadium deposit. As a unique vanadium resource in my country with extremely abundant reserves, vanadium extraction from coal shale will become an important development direction for the utilization of vanadium resources in my country.

[0005] Currently, pyrometallurgical processes mainly employ packed roasting in tunnel kilns or rotary kilns, resulting in slow heat transfer, low reaction efficiency, and poor roasting effects. Fluidized bed roasting (boiling-bed roasting) has attracted attention as a relatively efficient and reasonable technology for processing vanadium shale resources. However, due to the high requirements for reaction temperature and time to disrupt the crystal structure of vanadium shale, fluidized bed roasting suffers from problems such as incomplete reaction, long reaction time, and high energy consumption. Furthermore, vanadium shale often contains a certain proportion of residual carbon, which burns and generates heat during fluidized bed roasting, hindering stable temperature control of the system. Utility Model Content

[0006] To address the problems of incomplete reaction and long reaction time in the fluidization process of vanadium shale coal in existing technologies, this utility model proposes a pressurized fluidized roasting system and roasting method. After preheating the vanadium shale coal in the fluidized furnace tube, it is sent to the pressurized roasting device. By pressurizing roasting, the fluidized roasting time is shortened and the resource utilization rate is improved.

[0007] According to the first embodiment of this utility model, a pressurized fluidized bed roasting system is provided.

[0008] A pressurized fluidized bed roasting system includes a fluidized bed furnace tube and a pressurized roasting device. The fluidized bed furnace tube has a first fluidized gas inlet at its lower end and a first fluidized gas outlet at its upper end. The pressurized roasting device is arranged parallel to the fluidized bed furnace tube, and an opening communicating with the inner cavity of the pressurized roasting device is formed on the inner wall of the fluidized bed furnace tube, with a movable baffle at the opening. The pressurized roasting device has a second fluidized gas inlet at its lower end and a second fluidized gas outlet at its upper end. The pressurization of the pressurized roasting device is achieved by increasing the gas flow rate or changing the device volume. The height of the fluidized bed furnace tube is 0.5~200m.

[0009] Preferably, the pressure calcination apparatus includes a pressure calcination tube, with the second fluidized gas inlet located at the lower end of the pressure calcination tube and the second fluidized gas outlet located at the upper end of the pressure calcination tube, and a regulating valve provided at the second fluidized gas outlet. Preferably, the tube body of the pressure calcination tube includes a fixed tube body and a flexible tube body. The flexible tube body is connected to the fixed tube body, and the flexible tube body is optionally located on the upper side, lower side, or horizontal side of the fixed tube body.

[0010] Preferably, the pressurized calcination tube further includes a piston rod, which is connected to the outer wall of the elastic tube body and controls the expansion and contraction of the elastic tube body.

[0011] Preferably, the pressurized roasting apparatus further includes a gas circulation pipeline. One end of the gas circulation pipeline is connected to a second fluidized gas inlet, and the other end is connected to a gas outlet. Preferably, the gas circulation pipeline is equipped with a heating mechanism and a circulating fan.

[0012] Preferably, the system includes 1 to 4 independent pressure calcining devices, more preferably 2 to 3 independent pressure calcining devices. The sidewall of the fluidized bed furnace tube has an equal number of openings and movable baffles as the pressure calcining devices, and the pressure calcining tube of each pressure calcining device is connected to the inner cavity of the fluidized bed furnace tube through its corresponding opening.

[0013] Preferably, the system includes one pressure calcination device, wherein the pressure calcination tube is a cylindrical structure and is sleeved on the outside of the fluidized furnace tube.

[0014] Preferably, the movable baffle is a plate-shaped structure, with the plate body movably connected to the upper side wall of the opening, and the position of the movable baffle can be switched back and forth between covering the opening or covering the cross-section of the fluidized furnace tube above the opening.

[0015] Preferably, the movable baffle is provided with a slide rail on the side near the upper sidewall of the opening, and the upper sidewall of the opening is provided with pulleys and an angle adjustment mechanism. The movable baffle and the upper sidewall of the opening are connected by pulleys, slide rails and angle adjustment mechanism.

[0016] According to a second embodiment of the present invention, a pressurized fluidized bed roasting method is provided.

[0017] A pressurized fluidized bed roasting method, the method comprising the following steps: S1. The material is added into the inner cavity of the fluidized bed furnace tube, and at the same time, fluidizing gas is introduced into the inner cavity of the fluidized bed furnace tube from the first fluidizing gas inlet below the fluidized bed furnace tube, so that the material forms a fluidized state in the fluidized bed furnace tube and heats the material in the fluidized bed furnace tube.

[0018] S2. When the temperature inside the fluidized bed furnace tube rises to the target reaction temperature range, the upper part of the inner cavity of the fluidized bed furnace tube is sealed, and the material is blown into the pressure roasting device using fluidizing gas.

[0019] S3. After all the materials have entered the pressure roasting device, close the opening and start the pressure roasting device to allow the materials to react under the target atmosphere and pressure conditions. When the material reaction is complete, discharge the material to obtain the reaction product.

[0020] Preferably, the material described in step S1 is vanadium shale ore.

[0021] Preferably, the particle size of the material is less than 3 mm, and more preferably less than 1 mm.

[0022] Preferably, the fluidizing gas is oxygen or air, with air being the preferred choice.

[0023] Preferably, the flow rate of the fluidizing gas is 0.2~5m / s, and more preferably 0.5~3m / s.

[0024] Preferably, the standard reaction temperature range in step S2 is 500~1300℃, and more preferably 700~1000℃.

[0025] Preferably, the target atmosphere pressure in step S3 is 2 to 20 standard atmospheres, and more preferably 5 to 10 standard atmospheres.

[0026] Preferably, the reaction time of the material under pressure is 0.15~0.25h.

[0027] In this invention, a pressurized fluidized bed roasting system comprising a fluidized bed furnace tube and a pressurized roasting device is used. First, the material is fed into the fluidized bed furnace tube, and fluidizing gas is introduced through the first fluidizing gas inlet of the furnace tube, causing the material to enter a fluidized state and undergo preheating. After preheating, the material enters the pressurized roasting device, where fluidizing gas is introduced through the second fluidizing gas inlet. By changing the volume or gas pressure of the pressurized roasting device, the material undergoes pressurized fluidized bed roasting. This pressurized roasting method shortens the roasting time and improves roasting efficiency and resource utilization. Furthermore, this invention integrates the fluidized bed furnace tube and the pressurized roasting device, reducing costs and space requirements, and eliminating the need to transfer intermediate products to another reaction vessel, thus improving reaction efficiency and resource utilization.

[0028] In this invention, the pressure calcination device includes a pressure calcination tube. The lower end of the pressure calcination tube has a second fluidized gas inlet, and the upper end has a gas outlet. A regulating valve is installed at the gas outlet. After the opening is closed by a movable baffle, the gas flow rate at the second fluidized gas inlet and the valve opening of the regulating valve are controlled to achieve a pressurization effect. Furthermore, the pressure calcination tube is designed as a combination of a fixed tube body and a flexible tube body. The pressure inside the pressure calcination tube is increased by compressing the volume of the flexible tube body. The flexible tube body can be positioned above or below the fixed tube body (e.g., ...). Figure 1 ) or either side of the horizontal plane (e.g. Figure 3 This allows the compression of the elastic tube to change the overall internal volume of the pressurized roasting tube. More preferably, a gas circulation pipe (such as...) is installed outside the pressurized roasting tube. Figure 4 The gas enters the pressure-calcining tube through the second fluidized gas inlet at the lower end and exits through the gas outlet at the upper end. It then circulates back to the second fluidized gas inlet via a gas circulation pipe. This allows for better pressure regulation within the pressure-calcining tube through changes in gas volume or quantity. Furthermore, a heating mechanism can be installed on the gas circulation pipe to ensure that the temperature within the pressure-calcining tube remains within the reaction temperature range.

[0029] In this invention, the system may include one or more independent pressure calcination devices (such as...) Figure 5It may also include a cylindrical pressure roasting device (such as...) Figure 6 A cylindrical pressure roasting device is fitted outside the fluidized furnace tube, which can also achieve the function of pressure roasting.

[0030] In this invention, a movable baffle is used to control the communication state between the inner cavity of the fluidized furnace tube and the inner cavity of the pressure roasting tube. When the movable baffle covers the opening, the fluidizing gas only passes through the fluidized furnace tube. When the movable baffle covers the cross-section of the fluidized furnace tube above the opening, the fluidizing gas enters the pressure roasting tube through the opening and carries the reactants in the fluidized furnace tube into the pressure roasting tube for pressure roasting.

[0031] In this invention, the movable baffle is movably connected to the upper sidewall of the opening (i.e., the sidewall of the fluidized furnace tube above the opening) to switch the position of the movable baffle. The movable baffle can be connected to the upper sidewall of the opening via a rotating mechanism, with the upper end of the movable baffle connected to the upper sidewall of the opening via the rotating mechanism, causing the lower end of the movable baffle to rotate around the rotating mechanism as a fixed point. Alternatively, the movable baffle can be connected to the upper sidewall of the opening via a slide rail, pulleys, and an angle adjustment mechanism. The slide rail and pulleys control the position of the movable baffle, and the angle adjustment mechanism controls the tilt angle of the movable baffle (see [link to other descriptions] for the two positions of the movable baffle). Figure 1 , 2 The angle adjustment mechanism is one of the following: a rotary bearing, a universal joint, or other existing structures that can achieve the angle adjustment function; in addition, the movable baffle and the upper sidewall of the opening can also be connected by any other existing technology that can achieve this function.

[0032] In this invention, the particle size of the material, the type of fluidizing gas, the flow rate of the fluidizing gas, the reaction temperature range, and the reaction atmosphere pressure are limited, so that the material is under the optimal reaction conditions during the reaction process, thereby increasing the reaction rate, solving the problem of long reaction time in the normal fluidized bed roasting process, and improving resource utilization.

[0033] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a pressurized fluidized bed roasting system and roasting method, which preheats the material in a fluidized bed furnace tube and then sends it into a pressurized roasting tube for pressurized roasting, thereby shortening the roasting time, improving roasting efficiency and resource utilization, and solving the problem of long roasting time in conventional fluidized bed roasting processes.

[0034] 2. The present invention provides a pressurized fluidized bed roasting system and roasting method, which provides multiple methods for adjusting the pressure in the pressurized roasting tube through elastic tube body, piston rod, and gas circulation pipeline, so that the material in the pressurized roasting tube is under the best reaction conditions, which is more conducive to the control of the system and further improves the reaction efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the first structure of a pressurized fluidized bed roasting system provided by this utility model.

[0036] Figure 2 This is a schematic diagram of the structure of a pressurized fluidized bed roasting system with the opening in the open state, provided by this utility model.

[0037] Figure 3 This is a second structural schematic diagram of a pressurized fluidized bed roasting system provided by this utility model.

[0038] Figure 4 This is a schematic diagram of a third structure of a pressurized fluidized bed roasting system provided by this utility model.

[0039] Figure 5 This is a top view of the pressurized fluidized bed roasting system described in Embodiment 5 of this utility model.

[0040] Figure 6 This is a top view of the pressurized fluidized bed roasting system described in Embodiment 8 of this utility model.

[0041] Reference numerals: 1: Fluidized bed furnace tube; 2: Pressure roasting device; 201: Pressure roasting tube; 2011: Fixed tube body; 2012: Flexible tube body; 2013: Piston rod; 202: Regulating valve; 203: Gas circulation pipeline; 204: Heating mechanism; 205: Circulating fan; 3: First fluidized gas inlet; 4: First fluidized gas outlet; 5: Opening; 6: Movable baffle; 7: Second fluidized gas inlet; 8: Second fluidized gas outlet. Detailed Implementation

[0042] The technical solution of this utility model is illustrated below. The scope of protection of this utility model includes, but is not limited to, the following embodiments.

[0043] According to the first embodiment of this utility model, a pressurized fluidized bed roasting system is provided.

[0044] A pressurized fluidized bed roasting system includes a fluidized bed furnace tube 1 and a pressurized roasting device 2. The fluidized bed furnace tube 1 has a first fluidized gas inlet 3 at its lower end and a first fluidized gas outlet 4 at its upper end. The pressurized roasting device 2 is arranged parallel to the fluidized bed furnace tube 1, and an opening 5 communicating with the inner cavity of the pressurized roasting device 2 is formed on the inner wall of the fluidized bed furnace tube 1. A movable baffle 6 is provided at the opening 5. The pressurized roasting device 2 has a second fluidized gas inlet 7 at its lower end and a second fluidized gas outlet 8 at its upper end. The pressurization of the pressurized roasting device 2 is achieved by increasing the gas flow rate or changing the device volume. The height of the fluidized bed furnace tube 1 is 0.5~200m.

[0045] Preferably, the pressurized roasting device 2 includes a pressurized roasting tube 201, the second fluidized gas inlet 7 is located at the lower end of the pressurized roasting tube 201, the second fluidized gas outlet 8 is located at the upper end of the pressurized roasting tube 201, and a regulating valve 202 is provided at the second fluidized gas outlet 8.

[0046] Preferably, the tube body of the pressurized roasting tube 201 includes a fixed tube body 2011 and an elastic tube body 2012. The elastic tube body 2012 is connected to the fixed tube body 2011, and the elastic tube body 2012 is optionally disposed on the upper side, lower side or horizontal side of the fixed tube body 2011.

[0047] Preferably, the pressurized roasting tube 201 further includes a piston rod 2013, which is connected to the outer wall of the elastic tube body 2012 and controls the extension and retraction of the elastic tube body 2012.

[0048] Preferably, the pressurized roasting apparatus 2 further includes a gas circulation pipe 203. One end of the gas circulation pipe 203 is connected to the second fluidized gas inlet 7, and the other end is connected to the gas outlet. Preferably, the gas circulation pipe 203 is equipped with a heating mechanism 204 and a circulating fan 205.

[0049] Preferably, the system includes 1 to 4 independent pressure calcining devices 2, and more preferably 2 to 3 independent pressure calcining devices 2. The side wall of the fluidized bed furnace tube 1 is provided with an equal number of openings 5 ​​and movable baffles 6 as the pressure calcining devices 2. The pressure calcining tube 201 of each pressure calcining device 2 is connected to the inner cavity of the fluidized bed furnace tube 1 through its corresponding opening 5.

[0050] The system includes one pressure roasting device 2, wherein the pressure roasting tube 201 is a cylindrical structure and is sleeved on the outside of the fluidized furnace tube 1.

[0051] Preferably, the movable baffle 6 is a plate-shaped structure, with the plate body movably connected to the upper side wall of the opening 5. The position of the movable baffle 6 can be switched back and forth between covering the opening 5 or covering the cross-section of the fluidized furnace tube 1 above the opening 5.

[0052] Preferably, the movable baffle 6 is provided with a slide rail on the side near the upper sidewall of the opening 5, and the upper sidewall of the opening 5 is provided with a pulley and an angle adjustment mechanism. The movable baffle 6 and the upper sidewall of the opening 5 are connected by the pulley, the slide rail and the angle adjustment mechanism. Example 1

[0053] A pressurized fluidized bed roasting system includes a fluidized bed furnace tube 1 and a pressurized roasting device 2. The fluidized bed furnace tube 1 has a first fluidized gas inlet 3 at its lower end and a first fluidized gas outlet 4 at its upper end. The pressurized roasting device 2 is arranged side-by-side with the fluidized bed furnace tube 1, and an opening 5 communicating with the inner cavity of the pressurized roasting device 2 is formed on the inner wall of the fluidized bed furnace tube 1. A movable baffle 6 is provided at the opening 5. The pressurized roasting device 2 has a second fluidized gas inlet 7 at its lower end and a second fluidized gas outlet 8 at its upper end. The pressurization method of the pressurized roasting device 2 is to increase the pressure by changing the device volume. Example 2

[0054] The embodiment 1 is repeated, except that the pressure calcination device 2 includes a pressure calcination tube 201, the second fluidized gas inlet 7 is located at the lower end of the pressure calcination tube 201, the second fluidized gas outlet 8 is located at the upper end of the pressure calcination tube 201, and a regulating valve 202 is provided at the second fluidized gas outlet 8. Example 3

[0055] Example 2 is repeated, except that the pressure calcination tube 201 includes a fixed tube body 2011 and an elastic tube body 2012. The elastic tube body 2012 is connected to the fixed tube body 2011 and is located on the lower side of the fixed tube body 2011. Example 4

[0056] Example 2 is repeated, except that the tube body of the pressurized calcination tube 201 includes a fixed tube body 2011 and an elastic tube body 2012. The elastic tube body 2012 is connected to the fixed tube body 2011, and the elastic tube body 2012 is disposed on the horizontal side of the fixed tube body 2011. Example 5

[0057] Repeat Example 3, except that the pressurized roasting tube 201 further includes a piston rod 2013, which is connected to the outer wall of the elastic tube body 2012 and controls the extension and retraction of the elastic tube body 2012. Example 6

[0058] like Figure 4 As shown, Embodiment 5 is repeated, except that the pressurized roasting apparatus 2 further includes a gas circulation pipe 203. One end of the gas circulation pipe 203 is connected to the second fluidized gas inlet 7, and the other end is connected to the gas outlet. A heating mechanism 204 and a circulating fan 205 are provided on the gas circulation pipe 203. Example 7

[0059] Example 6 is repeated, except that the system includes two independent pressure calcination devices 2. The side wall of the fluidized furnace tube 1 is provided with an equal number of openings 5 ​​and movable baffles 6 as the pressure calcination devices 2. The pressure calcination tube 201 of each pressure calcination device 2 is connected to the inner cavity of the fluidized furnace tube 1 through its corresponding opening 5. Example 8

[0060] like Figure 6 As shown, Example 6 is repeated, except that the system includes one pressurized roasting device 2, and the pressurized roasting tube 201 is a cylindrical structure and is sleeved on the outside of the fluidized furnace tube 1. Example 9

[0061] Repeat Example 7, except that the movable baffle 6 is a plate-shaped structure, and the plate body is movably connected to the upper side wall of the opening 5. The position of the movable baffle 6 can switch back and forth between covering the opening 5 or covering the cross section of the fluidized furnace tube 1 above the opening 5.

[0062] The movable baffle 6 is provided with a slide rail on the side near the upper side wall of the opening 5. The upper side wall of the opening 5 is provided with pulleys and an angle adjustment mechanism. The movable baffle 6 and the upper side wall of the opening 5 are connected by pulleys, slide rails and angle adjustment mechanism.

[0063] The pressurized fluidized bed roasting system described in Example 9 was used to perform fluidized bed roasting of vanadium shale coal. The specific process is as follows: S1. Add 100g of vanadium shale ore particles with an average particle size of 0.92mm into the inner cavity of the fluidized bed furnace tube. At the same time, introduce air into the inner cavity of the fluidized bed furnace tube from the first fluidizing gas inlet at the bottom of the fluidized bed furnace tube at a flow rate of 0.9m / s. This causes the material to form a fluidized state in the fluidized bed furnace tube, and the introduced air is heated until the temperature in the fluidized bed furnace tube gradually rises to 800℃.

[0064] S2. When the temperature in the fluidized bed furnace tube rises to 800℃, adjust the position of the movable baffle to cover the cross-section of the fluidized bed furnace tube above the opening, close the upper part of the inner cavity of the fluidized bed furnace tube, and use fluidizing gas to blow the material into the pressure roasting device. After all the material has entered the pressure roasting device, adjust the position of the movable baffle to cover the opening again.

[0065] S3. Start the pressure roasting device, move the bottom of the elastic tube of the pressure roasting tube upward to reduce the volume of the container, increase the pressure inside the pressure roasting tube to 7 standard atmospheres, and let the material react under these conditions for 0.2 hours. After the material reaction is complete, discharge the material to obtain 78g of reaction product.

[0066] The reaction product obtained by detection contained 1.5% V2O5.

Claims

1. A pressurized fluidized bed roasting system, characterized in that: The system includes a fluidized bed furnace tube (1) and a pressure roasting device (2); the lower end of the fluidized bed furnace tube (1) is provided with a first fluidized gas inlet (3) and the upper end is provided with a first fluidized gas outlet (4); the pressure roasting device (2) is arranged side by side with the fluidized bed furnace tube (1), and an opening (5) communicating with the inner cavity of the pressure roasting device (2) is opened on the inner wall of the fluidized bed furnace tube (1), and a movable baffle (6) is provided at the opening (5); the lower end of the pressure roasting device (2) is provided with a second fluidized gas inlet (7) and the upper end is provided with a second fluidized gas outlet (8); wherein, the pressure roasting device (2) is pressurized by increasing the gas flow rate or changing the device volume; the height of the fluidized bed furnace tube (1) is 0.5~200m.

2. The system according to claim 1, characterized in that: The pressurized roasting device (2) includes a pressurized roasting tube (201), the second fluidized gas inlet (7) is located at the lower end of the pressurized roasting tube (201), the second fluidized gas outlet (8) is located at the upper end of the pressurized roasting tube (201), and a regulating valve (202) is provided at the second fluidized gas outlet (8).

3. The system according to claim 2, characterized in that: The tube body of the pressurized roasting tube (201) includes a fixed tube body (2011) and an elastic tube body (2012); the elastic tube body (2012) is connected to the fixed tube body (2011), and the elastic tube body (2012) is optionally disposed on the upper side, lower side or horizontal side of the fixed tube body (2011).

4. The system according to claim 3, characterized in that: The pressurized roasting tube (201) also includes a piston rod (2013), which is connected to the outer wall of the elastic tube body (2012) and controls the extension and retraction of the elastic tube body (2012).

5. The system according to claim 2, characterized in that: The pressurized roasting device (2) also includes a gas circulation pipe (203); one end of the gas circulation pipe (203) is connected to the second fluidized gas inlet (7), and the other end is connected to the gas outlet.

6. The system according to claim 5, characterized in that: The gas circulation pipe (203) is equipped with a heating mechanism (204) and a circulation fan (205).

7. The system according to any one of claims 1-6, characterized in that: The system includes 1 to 4 independent pressure roasting devices (2); the side wall of the fluidized furnace tube (1) is provided with an equal number of openings (5) and movable baffles (6) as the pressure roasting devices (2), and the pressure roasting tube (201) of each pressure roasting device (2) is connected to the inner cavity of the fluidized furnace tube (1) through its corresponding opening (5).

8. The system according to claim 7, characterized in that: The system includes 2 to 3 independent pressure roasting devices (2).

9. The system according to claim 2, characterized in that: The system includes a pressure roasting device (2), wherein the pressure roasting tube (201) is a cylindrical structure and is sleeved on the outside of the fluidized furnace tube (1).

10. The system according to any one of claims 1-6 and 8-9, characterized in that: The movable baffle (6) is a plate-shaped structure. The plate body is movably connected to the upper side wall of the opening (5). The position of the movable baffle (6) can switch back and forth between covering the opening (5) or covering the cross-section of the fluidized furnace tube (1) above the opening (5).

11. The system according to claim 10, characterized in that: The movable baffle (6) is provided with a slide rail on the side near the upper side wall of the opening (5). The upper side wall of the opening (5) is provided with a pulley and an angle adjustment mechanism. The movable baffle (6) and the upper side wall of the opening (5) are connected by a pulley, a slide rail and an angle adjustment mechanism.

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