hydrothermal reactor

Abstract

This invention provides a hydrothermal reactor, comprising: a reaction cylinder, a cylinder cover, a main stirring shaft, a heating assembly, and a secondary stirring assembly; the cylinder cover is installed on the top of the reaction cylinder; a heating assembly extending to the bottom of the reaction cylinder is fixed below the cylinder cover; the main stirring shaft is rotatably connected through the center of the cylinder cover, and a driving device is provided on the main stirring shaft above the cylinder cover; a propeller-type helical blade is installed at the bottom of the main stirring shaft; the secondary stirring assembly is rotatably connected below the cylinder cover and extends helically toward the bottom of the reaction cylinder, and at least two secondary stirring assemblies are evenly spaced around the main stirring shaft in a circumferential direction, with the main stirring shaft and the secondary stirring assembly shaft being drively connected. This application enhances the solution flow rate in the region near the liquid surface, resulting in superior overall processing efficiency and quality of the reactor.

Description

Technical Field

[0001] This invention belongs to the field of chemical reaction vessel technology, specifically, it relates to a hydrothermal reaction vessel. Background Technology

[0002] The core function of a hydrothermal reactor is to accelerate chemical reactions or decompose sparingly soluble substances under high temperature and pressure conditions within a sealed space, while ensuring the safety and controllability of the experiment. The outer tank is made of high-strength stainless steel (such as 304 or 316) or titanium alloy, possessing pressure resistance (up to 20 MPa) and impact resistance. Some industrial-grade equipment also uses Hastelloy to cope with highly corrosive media. The inner lining is made of different materials depending on the reaction requirements. Common materials include: Polytetrafluoroethylene (PTFE): resistant to strong acids and alkalis, applicable temperature ≤200℃, commonly used for routine corrosive reactions; Para-polystyrene (PPL): with better high-temperature resistance (≤260℃), suitable for strongly alkaline environments; Silicon carbide lining: a new material that can withstand high temperatures of 300℃ and strong corrosion, with a lifespan exceeding 5 years.

[0003] After the reactants and solvent (water or organic solvent) are added to the liner and sealed, the temperature is raised by a heating component. Under high temperature and pressure, the polarity and solubility of water are significantly enhanced, which can promote the dissolution and recrystallization of insoluble substances or trigger complex chemical reactions. By controlling the temperature, pressure, reaction time, and filling degree (usually not exceeding 80% of the liner volume), products with specific morphologies and structures, such as nanoparticles, single crystals, or composite materials, can be synthesized in a directional manner.

[0004] Reactors are typically equipped with stirring shafts to mix various materials and accelerate their dissolution and mixing. Common stirring shaft blades include propeller-type spiral blades, ribbon blades, flat blades, and anchor blades, among which propeller-type spiral blades are the most widely used.

[0005] Patent document CN212942908U discloses a dual-stirrer reactor, including a vessel body, a sealing cover fixed to the vessel body, a first bearing fixedly embedded in the sealing cover, a stirring shaft interference-fitted onto the first bearing, a first blade fixed to the stirring shaft, a drive gear fixed to the first blade, a right-angle bracket fixed to the inner wall of the vessel body, a second bearing fixed to the right-angle bracket, a linkage shaft interference-fitted onto the second bearing, and a linkage gear and a second blade respectively fixed to the linkage shaft. The rotation of the second blade increases the number of vortex rotations, thus achieving more uniform mixing compared to single-vortex stirring. The linkage gear meshes with the drive gear. By rotating the first and second blades, the number of stirring vortices is increased, resulting in more uniform mixing and ensuring stirring quality.

[0006] However, existing technologies such as patent document CN212942908U use spiral blades as stirring pairs. The three sets of spiral blades rotate synchronously, which can push the solution to flow axially and form an axial vortex, thereby improving the mixing effect of multiple materials. However, the pushing effect of the propulsion spiral blades is limited. Especially when the solution content in the reactor is large or the molecular mass of the material is large, the solution will drop rapidly along the axial direction due to its own weight. This results in a small vortex range formed by the solution as a whole, and the solution flow is slow in a region near the liquid surface. Consequently, the overall processing efficiency and quality of the reactor are reduced.

[0007] To enhance the solution flow rate in the region near the liquid surface, thereby improving the overall processing efficiency and quality of the reactor, this invention designs a hydrothermal reactor that solves the aforementioned problems. Summary of the Invention

[0008] In view of the deficiencies in the prior art, the purpose of this invention is to provide a hydrothermal reactor.

[0009] A hydrothermal reactor according to the present invention includes: a reaction cylinder, a cylinder cover, a main stirring shaft, a heating assembly, and a secondary stirring assembly;

[0010] The cylinder cover is installed on the top of the reaction cylinder; a heating component extending to the bottom of the reaction cylinder is fixed below the cylinder cover; a main stirring shaft is inserted through and rotatably connected to the middle of the cylinder cover, and a driving device is provided on the main stirring shaft above the cylinder cover.

[0011] The bottom of the main stirring shaft is equipped with a propulsion spiral blade; the auxiliary stirring assembly is rotatably connected to the bottom of the cylinder cover and extends spirally toward the bottom of the reaction cylinder, and at least two auxiliary stirring assemblies are evenly spaced around the main stirring shaft in the circumferential direction, and the main stirring shaft is connected to the auxiliary stirring assembly shaft in a drive connection.

[0012] Preferably, the auxiliary stirring assembly includes a fixed frame, a toothed disc, an auxiliary stirring shaft, and ribbon blades;

[0013] The fixed bracket is fixedly connected to the bottom of the cylinder cover; the gear disc is rotatably connected to the bottom of the fixed bracket, and the gear disc shaft is set vertically.

[0014] The auxiliary stirring shaft is rotatably connected to the bottom of the fixed frame. The toothed disc is coaxially sleeved on the auxiliary stirring shaft. At least two paddle-shaped flat blades are evenly spaced along the circumference at the bottom of the auxiliary stirring shaft. The paddle-shaped flat blades are located on the upper side of the middle of the reaction cylinder.

[0015] A first gear set is provided for transmission between the gear disc and the auxiliary stirring shaft; the spiral blades are fixed below the gear disc and extend downwards spirally around the auxiliary stirring shaft.

[0016] Preferably, a pressure gauge is provided on the top of the cylinder cover;

[0017] The cylinder cover is equipped with a downward-connected inlet pipe and an outlet pipe. The top of the outlet pipe is connected to an outlet valve located on one side above the cylinder cover. The outlet valve is connected to a negative pressure suction device. The bottom of the outlet pipe extends downward to the bottom of the reaction cylinder.

[0018] The top of the inlet pipe is connected to an inlet valve located on one side above the cylinder cover, and the bottom of the inlet pipe extends downward to the bottom of the reaction cylinder.

[0019] Preferably, the liquid inlet pipe extends circumferentially around the bottom of the reaction cylinder at one end to form an extension end, and a rotary spray valve is rotatably connected above the extension end. The rotary spray valve has at least two nozzles facing upward. The rotation axis of the rotary spray valve is coaxial with the axis of the gear disc, and the rotary spray valve is fixedly connected to the upper spiral blade.

[0020] Preferably, the rotary spray valve has at least two spray nozzles distributed on its top, with the openings facing vertically upwards.

[0021] Preferably, the spiral blades are inclined upwards from the inner ring to the outer ring, and the inclination is 45°.

[0022] Preferably, the heating component extends spirally downward around the main stirring shaft, and is located between the main stirring shaft and the auxiliary stirring component, and is connected to a temperature control device.

[0023] Preferably, three propulsion helical blades are evenly spaced along the main stirring shaft.

[0024] Preferably, three sets of auxiliary stirring components are evenly spaced around the main stirring shaft, and a second gear set is provided between the gear discs of the three sets of auxiliary stirring components and the main stirring shaft for transmission.

[0025] Preferably, the reaction cylinder and the cylinder cover are made of metal, the reaction cylinder and the cylinder cover are connected by a flange, and the inner side of the reaction cylinder and the cylinder cover is provided with a corrosion-resistant layer.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This invention, by setting up a secondary stirring assembly, utilizes the rotation of the spiral blades of the secondary stirring assembly to drive the solution upward, which, in conjunction with the axial vortex effect of the propulsion spiral blades, increases the range of the axial vortex of the solution, allowing the solution at the bottom of the reactor and the solution near the liquid surface to be fully exchanged and mixed. At the same time, the secondary stirring assembly also includes multiple sets of paddle-type flat blades, which are mainly distributed in the upper part of the reactor and are used to stir and disperse the solution near the liquid surface.

[0028] 2. This invention features a circular inlet pipe at the bottom of the reaction cylinder, with multiple rotary spray valves mounted on its exterior. The rotating rod of the helical blades of the auxiliary stirring shaft assembly drives the rotary spray valves to rotate, causing the solution sprayed from the rotary spray valves to rise in a spiral pattern. This allows the added solution to better mix with the existing solution. Furthermore, the upward flow of the solution sprayed from the rotary spray valves, combined with the lifting effect of the helical blades, further enhances the axial vortex effect of the solution. Attached Figure Description

[0029] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 This is a schematic diagram showing the distribution of multiple auxiliary stirring components according to the present invention.

[0032] Figure 3 This is a schematic diagram showing the distribution of multiple auxiliary stirring components and the main stirring shaft of the present invention.

[0033] Figure 4 This is a schematic diagram showing the distribution of the main stirring shaft, the second gear set, and the auxiliary stirring assembly of the present invention.

[0034] Figure 5 This is a schematic diagram of the secondary stirring component of the present invention.

[0035] Figure 6 This is a front view of the auxiliary stirring assembly of the present invention.

[0036] Figure 7 This is a schematic diagram showing the distribution of the inlet valve, inlet pipe, and multiple sets of rotary spray valves of the present invention.

[0037] Figure 8 This diagram illustrates the liquid flow direction during the operation of a single propulsive helical blade according to the present invention.

[0038] Figure 9 This diagram illustrates the liquid flow direction when the propulsion spiral blades, multiple sets of rotating spray valves, and multiple sets of auxiliary stirring components of the present invention work together.

[0039] The diagram shows: 1. Reaction cylinder; 2. Cylinder cover; 3. Pressure gauge; 4. Inlet valve; 5. Inlet pipe; 6. Rotary spray valve; 7. Outlet valve; 8. Outlet pipe; 9. Main stirring shaft; 10. Propeller spiral blade; 11. Heating assembly; 12. Secondary stirring assembly; 1201. Fixing frame; 1202. Gear disc; 1203. Secondary stirring shaft; 1204. Paddle-type flat blade; 1205. First gear set; 1206. Ribbon blade; 13. Second gear set. Detailed Implementation

[0040] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0041] like Figures 1-9 As shown, a hydrothermal reactor includes a reaction cylinder 1, a cylinder cover 2, a main stirring shaft 9, a heating assembly 11, and a secondary stirring assembly 12.

[0042] A cover 2 is installed on top of the reaction vessel 1. A heating assembly 11 extending to the bottom of the reaction vessel 1 is fixed below the cover 2. A main stirring shaft 9 is inserted through and rotatably connected to the center of the cover 2, and a drive device is provided above the cover 2 on the main stirring shaft 9. A propeller-type spiral blade 10 is installed at the bottom of the main stirring shaft 9. A secondary stirring assembly 12 is rotatably connected to the bottom of the cover 2 and extends spirally toward the bottom of the reaction vessel 1. At least two secondary stirring assemblies 12 are evenly spaced around the main stirring shaft 9 in two circumferential directions, and the rotating shaft of the main stirring shaft 9 is drively connected to the rotating shaft of the secondary stirring assembly 12.

[0043] The working principle of this application is as follows: the heating component 11 is used to provide the temperature for the chemical reaction, the driving structure is used to drive the main stirring shaft 9 to rotate at high speed, the propeller-type spiral blade 10 provides a vortex effect for the liquid in the reaction tank 1, and the auxiliary stirring component 12 increases the range of the axial vortex of the solution, so that the solution at the bottom of the reactor and the solution near the liquid surface can be fully exchanged and mixed. By using multiple sets of auxiliary stirring components 12 to work together, the axial vortex effect of the solution in the reaction tank 1 can be better promoted, thereby improving the efficiency and quality of the chemical reaction process in the reactor.

[0044] Specifically, the auxiliary stirring assembly 12 includes a fixed frame 1201, a geared disc 1202, an auxiliary stirring shaft 1203, and a ribbon-type blade 1206. The fixed frame 1201 is fixedly connected to the bottom of the cylinder cover 2. The geared disc 1202 is rotatably connected to the bottom of the fixed frame 1201, and the axis of the geared disc 1202 is vertically oriented. The auxiliary stirring shaft 1203 is rotatably connected to the bottom of the fixed frame 1201, and the geared disc 1202 is coaxially sleeved on the auxiliary stirring shaft 1203. At least two paddle-type flat blades 1204 are evenly spaced along the circumference at the bottom of the auxiliary stirring shaft 1203, and the paddle-type flat blades 1204 are located on the upper side of the middle part inside the reaction cylinder 1. A first gear set 1205 is provided for transmission between the geared disc 1202 and the auxiliary stirring shaft 1203. The ribbon-type blade 1206 is fixed to the bottom of the geared disc 1202, and the ribbon-type blade 1206 extends spirally downward around the auxiliary stirring shaft 1203. The spiral blades 1206 of the auxiliary stirring assembly 12 rotate to push the solution upward, which, in conjunction with the axial vortex effect of the propeller-type spiral blades 10, increases the range of the axial vortex in the solution. At the same time, the paddle-type flat blades 1204 are used to stir and disperse the solution near the liquid surface.

[0045] A pressure gauge 3 is installed on the top of the cylinder cover 2 to detect the pressure inside the reaction cylinder 1. The cylinder cover 2 has a downward-connected inlet pipe 5 and an outlet pipe 8. The top of the outlet pipe 8 is connected to an outlet valve 7 located on one side above the cylinder cover 2. The outlet valve 7 is connected to a negative pressure suction device. The bottom end of the outlet pipe 8 extends downward to the bottom of the reaction cylinder 1. The outlet pipe 8 is used to extract the processed solution inside the reaction cylinder 1. The top of the inlet pipe 5 is connected to an inlet valve 4 located on one side above the cylinder cover 2. The bottom end of the inlet pipe 5 extends downward to the bottom of the reaction cylinder 1. The inlet pipe 5 is used to add multiple reaction solutions one by one.

[0046] The liquid inlet pipe 5 extends circumferentially around the bottom of the reaction cylinder 1 at one end, forming an extension end. A rotary spray valve 6 is rotatably connected above the extension end, and the rotary spray valve 6 has at least two upward-facing nozzles. The rotation axis of the rotary spray valve 6 is coaxial with the axis of the gear disc 1202. The rotary spray valve 6 is fixedly connected to the upper helical blade 1206, driving the rotary spray valve 6 to rotate. By utilizing the rotation of the helical blade 1206 to drive the rotary spray valve 6 to rotate, the liquid sprayed from the rotary spray valve 6 through multiple nozzles can spiral upwards, allowing for more thorough mixing of the subsequently sprayed liquid and the existing liquid.

[0047] Preferably, the top of the rotary spray valve 6 has four spray nozzles with vertically upward openings. By using the spray pressure, the solution can be sprayed from the bottom of the reaction cylinder 1 to the liquid surface as much as possible, so as to achieve solution exchange and mixing from top to bottom in the reaction cylinder 1. If the spray nozzles are set at an angle, the vortex effect generated by the rotation of the propeller-type spiral blade 10 when the solution is sprayed at an angle will interfere with the vortex effect generated by the rotation of the propeller-type spiral blade 10.

[0048] The ribbon blade 1206 is inclined upward from the inner ring to the outer ring, which reduces the liquid slippage due to gravity when the ribbon blade 1206 rotates. By tilting the ribbon blade 1206 upward at 45°, the liquid around the blade is reduced from slippage due to gravity and centrifugal force when it rotates. The liquid sprayed by the rotary spray valve 6 is located at the center of the ribbon blade 1206. The force of the solution spray also reduces the liquid around the blade from slipping inward due to gravity when the ribbon blade 1206 rotates.

[0049] The heating component 11 extends spirally downward around the main stirring shaft 9 and is located between the main stirring shaft 9 and the auxiliary stirring component 12. The heating component 11 is connected to a temperature control device. The heating component 11 is used to heat the solution in the reaction vessel 1 to meet the reaction requirements.

[0050] In one embodiment, three sets of auxiliary stirring components 12 are evenly spaced around the main stirring shaft 9, and a second gear set 13 is provided between the gear disk 1202 of the three sets of auxiliary stirring components 12 and the main stirring shaft 9 for transmission.

[0051] Preferably, the first gear set 1205 includes a first meshing gear ring, a first sun gear, and a first planetary gear. The first meshing gear ring is disposed on the inner ring of the gear disk 1202. The first sun gear is coaxially fixed to the auxiliary stirring shaft 1203. Three first planetary gears are evenly spaced around the first sun gear, and the first planetary gears are rotatably connected to the fixed frame 1201, and the first planetary gears are meshed between the first meshing gear ring and the first sun gear.

[0052] Preferably, the second gear set 13 includes a second sun gear and a second planetary gear. A second meshing gear ring is disposed on the inner ring of the gear disk 1202. The second sun gear is coaxially fixed to the main stirring shaft 9. Three second planetary gears are evenly spaced around the second sun gear, and the second planetary gears are rotatably connected to the cylinder cover 2. The second planetary gears are respectively meshed between the same main stirring shaft 9 and the outer rings of different gear disks 1202.

[0053] In one embodiment, six paddle-shaped flat blades 1204 are evenly spaced circumferentially at the bottom of the auxiliary stirring shaft 1203.

[0054] In one embodiment, the driving device includes a drive motor, which is fixed relative to the reaction cylinder 1, and the output shaft of the drive motor is sleeved and coaxially connected to the main stirring shaft.

[0055] In one embodiment, three propulsion helical blades 10 are evenly spaced along the main stirring shaft 9.

[0056] Preferably, both the reaction cylinder 1 and the cylinder cover 2 are made of metal, and the reaction cylinder 1 and the cylinder cover 2 are connected by a flange. The inner side of the reaction cylinder 1 and the cylinder cover 2 is provided with a corrosion-resistant layer. By making the reaction cylinder 1 and the cylinder cover 2 of metal, such as stainless steel that meets the standards, the reactor can be subjected to high-pressure chemical processing. The flange connection can also ensure the overall strength of the reactor. The inner side is provided with an acid and alkali resistant anti-corrosion layer, such as polytetrafluoroethylene.

[0057] In practical operation, when the reaction cylinder 1 of this application is used for chemical processing, water is usually used as the main mixing liquid. Then, various raw materials are added into the inlet pipe 5 through the inlet valve 4 as required. The solution is sprayed upward from the rotary spray valve 6 and mixed into the water in the reaction cylinder 1. At the same time, the drive device is started to drive the main stirring shaft 9 to rotate. The main stirring shaft 9 drives the propeller spiral blade 10 connected to it to rotate. The rotation of the propeller spiral blade 10 pushes the water flow to form an axial vortex within a certain range, thereby allowing the solution added one by one to circulate in the reaction cylinder 1, improving the mixing effect. At the same time, the heating component 11 is started and connected to the temperature control device to make the heating component 11 work to provide heat to the reaction vessel.

[0058] At the same time, the main stirring shaft 9 drives the gear disk 1202 of each auxiliary stirring component 12 to rotate through the second gear set 13. The gear disk 1202 drives the connected spiral blade 1206 to rotate. The gear disk 1202 drives the auxiliary stirring shaft 1203 to rotate through the first gear set 1205. The auxiliary stirring shaft 1203 drives the connected paddle plate blade 1204 to rotate.

[0059] When the helical blade 1206 rotates, it drives the rotary spray valve 6, which is fixedly connected to it, to rotate. This causes the solution that was sprayed vertically upward from the rotary spray valve 6 to rise spirally. The spiral rise of the solution can better improve the mixing effect by increasing the contact area with the existing water or other solutions. The rotary spray valve 6 sprays the solution under pressure, and the upward force of the solution can drive the solution molecules at the bottom of the reaction cylinder 1 to flow upward. That is, when the rotary spray valve 6 sprays the solution, it cooperates with the rotation of the propulsion helical blade 10 to increase the overall vortex range of the solution in the reaction cylinder 1, so that the solution at the bottom of the reaction cylinder 1 can flow to the area near the liquid surface, realizing the exchange and mixing of the solution inside the reaction cylinder 1 from bottom to top. At the same time, the rotation of the helical blade 1206, with its own rotational lifting effect, can assist the solution sprayed by the rotary spray valve 6 and the existing solution in the reaction cylinder 1 to flow further upward, further improving the axial vortex effect of the solution.

[0060] When the paddle-type flat blade 1204 rotates, it radially stirs and disperses the solution molecules near the liquid surface, causing some of the lighter and more easily floating solutions to disperse and mix. Then, the propeller-type spiral blade 10, the auxiliary stirring assembly 12, and the rotary spray valve 6 work together to improve the efficiency and quality of the reaction vessel stirring process. After the chemical mixing process is completed, the solution in the reaction vessel 1 can be extracted and used by connecting the negative pressure suction device to the liquid outlet valve 7.

[0061] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A hydrothermal reaction kettle, characterized in that, The utility model provides a reaction kettle, which comprises a reaction cylinder (1), a cylinder cover (2), a main stirring shaft (9), a heating assembly (11) and a secondary stirring assembly (12). The cylinder cover (2) is installed on the top of the reaction cylinder (1); the heating assembly (11) extending to the bottom of the reaction cylinder (1) is fixed below the cylinder cover (2); the main stirring shaft (9) is rotatably connected through the cylinder cover (2); and the driving device is arranged above the main stirring shaft (9). The bottom of the main stirring shaft (9) is provided with a propelling helical blade (10); the secondary stirring assembly (12) is rotatably connected below the cylinder cover (2) and spirally extends towards the bottom of the reaction cylinder (1); at least two circumferential secondary stirring assemblies (12) are evenly arranged around the main stirring shaft (9); and the rotation shaft of the main stirring shaft (9) is in transmission connection with the rotation shaft of the secondary stirring assembly (12). The secondary stirring assembly (12) comprises a fixing frame (1201), a gear disc (1202), a secondary stirring shaft (1203) and a spiral blade (1206). The fixing frame (1201) is fixedly connected below the cylinder cover (2); the gear disc (1202) is rotatably connected below the fixing frame (1201); and the shaft center of the gear disc (1202) is vertically arranged. The secondary stirring shaft (1203) is rotatably connected below the fixing frame (1201); the gear disc (1202) is coaxially sleeved on the secondary stirring shaft (1203); and at least two paddle flat blades (1204) are evenly arranged around the bottom of the secondary stirring shaft (1203); the paddle flat blades (1204) are arranged on the upper side of the middle part of the reaction cylinder (1). The first gear set (1205) is arranged between the gear disc (1202) and the secondary stirring shaft (1203) in transmission connection; the spiral blade (1206) is fixed below the gear disc (1202) and spirally extends downwards around the secondary stirring shaft (1203). The cylinder cover (2) is provided with a liquid inlet pipe (5) and a liquid outlet pipe (8) in communication; the bottom end of the liquid inlet pipe (5) extends downwards to the bottom of the reaction cylinder (1). The end of the liquid inlet pipe (5) near the bottom of the reaction cylinder (1) extends around the bottom of the reaction cylinder (1) to form an extension end; the rotation liquid spraying valve (6) is rotatably arranged above the extension end; the rotation liquid spraying valve (6) is provided with at least two nozzles upwards; the rotation center of the rotation liquid spraying valve (6) is coaxially arranged with the shaft center of the gear disc (1202); and the rotation liquid spraying valve (6) is fixedly connected with the spiral blade (1206) above. The cylinder cover (2) is provided with a pressure gauge (3) on the top.

2. The hydrothermal reaction kettle according to claim 1, characterized in that, The top end of the liquid outlet pipe (8) is in communication with the liquid outlet valve (7) arranged on one side above the cylinder cover (2); the liquid outlet valve (7) is connected with a negative pressure suction device; and the bottom end of the liquid outlet pipe (8) extends downwards to the bottom of the reaction cylinder (1). The top of the liquid inlet pipe (5) is in communication with the liquid inlet valve (4) arranged on one side above the cylinder cover (2). The spiral blade (1206) is arranged to be inclined upwards from the inner ring to the outer ring at an angle of 45 degrees.

3. The hydrothermal reaction kettle according to claim 2, characterized in that, The heating assembly (11) spirally extends downwards around the main stirring shaft (9); the heating assembly (11) is arranged between the main stirring shaft (9) and the secondary stirring assembly (12); and the heating assembly (11) is connected with a temperature control device.

4. The hydrothermal reaction kettle according to claim 3, characterized in that, ​ 5. The hydrothermal reaction kettle according to claim 4, characterized in that, The propelling helical blade (10) is evenly spaced three along the main stirring shaft (9).

6. The hydrothermal reaction kettle according to claim 5, characterized in that, The secondary stirring assembly (12) is evenly spaced three around the main stirring shaft (9) in the circumferential direction, and the gear disc (1202) of the three secondary stirring assemblies (12) and the main stirring shaft (9) are drivingly connected through the second gear set (13).

7. The hydrothermal reaction kettle according to claim 6, characterized in that, The reaction cylinder (1) and the cylinder cover (2) are made of metal, the reaction cylinder (1) and the cylinder cover (2) are connected by flanges, and the inner sides of the reaction cylinder (1) and the cylinder cover (2) are provided with corrosion-resistant layers.

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