A carbon fractionation reactor

Abstract

The utility model discloses a carbon fractionation reation kettle belongs to the technical field of alumina production. The device specifically through the lower part of the reaction kettle body wall setting carbon dioxide gas inlet, this carbon dioxide gas inlet is connected to the inner coil of reaction kettle body cavity bottom through the gas inlet pipe. The inner coil end is closed, and the tubular body is uniformly densely covered with carbon dioxide gas hole with 0.5~2 mm aperture. The structure realizes the uniform dispersion release of carbon dioxide gas from the reaction kettle bottom multiple points, significantly increases the contact area of gas and the sodium aluminate slurry in the kettle, effectively overcomes the local supersaturation and stratification phenomenon caused by the traditional mode, improves the gas-liquid mixing efficiency and the alumina precipitation uniformity. At the same time, equip with jacket temperature control system to stabilize the reaction condition, and adopt double or three layer stirring paddle to optimize the flow field. The overall structure is reasonable and compact, solves the problem of low mixing efficiency and structural safety hidden danger, and is simple and easy to operate and easy to promote.

Description

Technical Field

[0001] This utility model relates to the field of alumina production technology, specifically to a carbon separation reaction vessel. Background Technology

[0002] With the continuous development of industrial technology, increasingly stringent requirements have been placed on the quality and yield standards of products such as alumina. In related production processes, the design and technology of carbon dioxide reaction vessels play a crucial role, with their main function focusing on the decomposition of aluminum-containing compound solutions. Specifically, their working principle involves precisely introducing carbon dioxide gas into the solution, causing aluminum to precipitate as alumina. This process achieves efficient separation of aluminum from other impurities in the solution, resulting in a relatively pure alumina product. However, in alumina production, existing technologies generally employ a single vertically installed vent pipe to transport carbon dioxide gas to the bottom of the reaction vessel. This design has significant drawbacks: First, the gas must undergo a long vertical transport path, increasing pipe material consumption and construction costs, and is prone to gas velocity attenuation due to liquid column static pressure, resulting in low gas-liquid mass transfer efficiency. Second, the vertical upward flow formed by a single gas inlet is difficult to create effective turbulence within a large-diameter reaction vessel, leading to significant stratification in the mixing of carbon dioxide and sodium aluminate solution. Gas accumulation zones easily form at the top of the reactor, while localized supersaturation occurs at the bottom, directly affecting the uniformity of alumina precipitation and reaction time. In addition, vertical pipelines are prone to pipe vibration and stress fatigue due to the scouring of slurry in the reactor and the fluid disturbance caused by the stirring device during long-term operation, which poses a safety hazard of weld cracking and leakage.

[0003] In existing technologies, some methods employ multiple vertical ventilation pipes distributed at the top of the reactor to improve mixing efficiency by injecting carbon dioxide gas at multiple points. However, this approach presents a series of engineering challenges: First, the multiple vertical pipes occupy a significant amount of space at the top of the reactor, increasing the pressure load on the tank structure and causing stress concentration at the weld seams, which can easily lead to weld cracking. Second, the multi-pipe gas supply system significantly increases equipment investment costs, and the pipe spacing must be strictly designed to avoid mutual interference between jets, resulting in uneven airflow distribution. Furthermore, during operation, the differences in gas flow rates in each branch of the multi-pipe system can easily create competitive jets, leading to cavitation at the ends of some pipes, accelerating the corrosion rate of the pipe inner walls, and reducing the average service life by more than 40% compared to a single-pipe system. Finally, the spatial coordination between the multiple vertical pipes and the stirring blades is extremely difficult. When the stirring speed is too high, the rotating blades will periodically collide with the rising airflow, causing excessive pipe vibration amplitude and severely affecting the operational stability of the equipment.

[0004] In summary, the existing single-top vertical venting pipe solution suffers from low gas mixing efficiency. When carbon dioxide is vertically introduced from the top of the reactor, it forms a unidirectional longitudinal flow field, resulting in a limited contact area with the slurry inside the reactor. This can easily lead to a localized supersaturation zone in the lower half of the reactor, affecting the uniformity of alumina precipitation. While the multi-pipe parallel gas supply solution can improve the mixing effect, it has a high system investment cost, and the concentrated load of a large number of vertical pipes significantly increases the pressure load on the top structure of the reactor, posing a significant safety hazard. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a carbon separation reactor, which improves the problems of low gas mixing efficiency and limited contact area of ​​slurry in the reactor by introducing carbon dioxide gas from the bottom of the reactor and combining it with exhaust through the bottom coil of the reactor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model proposes a carbon separation reactor, including a reactor body, an inner coil installed at the bottom of the reactor body cavity, the end of the inner coil being closed, the beginning of the inner coil being connected to the outlet of a carbon dioxide inlet pipe, the inlet of the carbon dioxide inlet pipe being connected to a carbon dioxide inlet, and the carbon dioxide inlet being located at the lower part of the reactor body wall; multiple carbon dioxide outlet holes are evenly distributed on the inner coil.

[0007] Specifically, it also includes a stirring shaft with stirring blades. The upper end of the stirring shaft is connected to a stirring motor, which is located on the outer side of the top of the reactor body and connected to a speed reducer.

[0008] More specifically, the stirring blades are double-layered or triple-layered.

[0009] Specifically, the diameter of the carbon dioxide outlet is 0.5~2 mm.

[0010] Specifically, the top of the reactor body is provided with a manhole, and the manhole is equipped with a removable cover; the top of the reactor body is also provided with a feed inlet, and the bottom of the reactor body is provided with a discharge outlet.

[0011] Specifically, a thermometer sleeve is installed inside the reactor body.

[0012] More specifically, the reactor body is fitted with a jacket, with a jacket circulation inlet at the top and a jacket circulation outlet at the bottom.

[0013] Specifically, a steam valve is provided at the jacket circulation inlet, and a coolant valve is provided at the jacket circulation outlet.

[0014] Specifically, the carbon dioxide inlet pipe is equipped with a flow regulating valve.

[0015] Specifically, the inner coil is a stainless steel coil or a titanium alloy coil.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a carbon separation reactor. By introducing carbon dioxide gas from the lower side of the reactor body and installing an inner coil with uniformly distributed holes at the bottom of the reactor, the contact area between the gas and the slurry is significantly increased, achieving efficient and uniform gas-liquid mixing. The excellent gas-liquid mixing effect promotes the efficient progress of the carbon separation reaction. The overall design of this invention is simple, easy to manufacture, and convenient to operate, making it suitable for widespread application in existing carbon separation reactors.

[0017] Furthermore, this device is equipped with a jacket to regulate the temperature inside the reactor, ensuring stable reaction conditions and further improving product quality and production efficiency. Attached Figure Description

[0018] Figure 1 This is a longitudinal sectional view of an embodiment of the present utility model; Figure 2 This is a cross-sectional view of an embodiment of the present utility model; The components are: 1. Reactor body, 2. Manhole, 3. Stirring motor, 4. Reducer, 5. Stirring shaft, 6. Feed inlet, 7. Thermometer sleeve, 8. Jacket, 9. Jacket circulation inlet, 10. Carbon dioxide inlet pipe, 11. Jacket circulation outlet, 12. Discharge outlet, 13. Stirring blades, 14. Carbon dioxide inlet, 15. Inner coil, 16. Carbon dioxide outlet. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0020] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; in addition, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1 See Figure 1 A reactor device with an internal coil includes a reactor body 1, the top of which is provided with a manhole 2 for maintenance or feeding, and the manhole 2 is provided with a removable cover; a stirring motor 3 is installed on the top of the reactor body 1, and a stirring shaft 5 is driven to rotate through a reducer 4. The bottom end of the stirring shaft 5 extends to the lower part of the inner cavity of the reactor body 1 and is provided with stirring blades 13; a feed inlet 6 is provided on one side of the upper part of the reactor body 1 for easy addition of raw materials; a thermometer sleeve 7 is provided in the middle of the reactor body 1 for real-time monitoring of the reaction temperature; a jacket 8 is fitted on the outside of the reactor body 1, the upper part of the jacket 8 is provided with a jacket circulation inlet 9, and the lower part is provided with a jacket circulation outlet 11 for introducing steam or coolant to regulate the temperature inside the reactor; The reactor body 1 has a carbon dioxide inlet pipe 10 at its bottom for introducing gas into the reactor body 1; an inner coil 15 is provided in the lower part of the inner cavity of the reactor body 1, which is connected to a gas source outside the reactor body 1 through a carbon dioxide inlet 14 for uniformly introducing carbon dioxide gas into the reactor body 1; the inner coil 15 has a ring structure, see [reference needed]. Figure 2 The surface of the reactor has multiple carbon dioxide vent holes 16 evenly distributed to increase the contact area between the gas and the liquid and achieve efficient gas-liquid mixing reaction; the bottom of the reactor body 1 is provided with a discharge port 12 to facilitate the discharge of reaction products.

[0022] The inner coil 15 is made of corrosion-resistant materials (such as stainless steel or titanium alloy) to improve its durability and corrosion resistance in the reaction medium. The carbon dioxide outlet 16 of the inner coil 15 is designed as a small hole with a diameter of 0.5~2 mm and the holes are evenly distributed to ensure that the gas can enter the interior of the reactor smoothly and evenly.

[0023] The stirring blades 13 are preferably of a double-layer or triple-layer structure, with the upper blades used to lift the liquid and the lower blades used to enhance the stirring effect, thereby further improving the gas-liquid mixing efficiency.

[0024] A steam valve is installed at the 9th position of the jacket circulation inlet, and a coolant valve is installed at the 11th position of the jacket circulation outlet, which facilitates switching between steam and coolant according to the reaction temperature requirements.

[0025] The carbon dioxide inlet pipe 10 is equipped with a flow regulating valve, which can precisely control the amount of carbon dioxide entering the pipe and ensure the stability of the reaction conditions.

[0026] The inner coil 15 is connected to the carbon dioxide inlet pipe 10 via a flange, which facilitates disassembly and cleaning, effectively prevents blockage, extends the service life of the device, reduces maintenance costs, and makes disassembly and maintenance convenient.

[0027] When the carbon reaction vessel device for alumina production of this utility model is in operation: Carbon dioxide gas is introduced through the carbon dioxide inlet 14 at the bottom of the reactor body wall. The carbon dioxide enters the carbon dioxide inlet pipe 10 through the inlet 14 and reaches the inner coil 15 at the bottom of the reactor body 1 cavity. The carbon dioxide overflows from multiple evenly distributed carbon dioxide outlet holes 16 on the inner coil 15. This ensures effective reaction between the carbon dioxide and the aluminum-containing compound solution in the reactor body 1 cavity, facilitating the precipitation of aluminum ions in the solution as alumina. A stirring paddle 13 is used during the reaction to assist in improving the aluminum ion precipitation efficiency, resulting in a relatively pure alumina product.

[0028] In summary, this utility model provides a high-efficiency, uniform, and easy-to-maintain carbonation reactor, which can effectively improve the operating efficiency and economy of the carbonation reactor, and has significant technological progress and practical value.

[0029] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A carbon separation reactor, characterized in that, The reactor body (1) includes an inner coil (15) at the bottom of the reactor body (1) cavity. The inner coil (15) is closed at the end and connected to the outlet of the carbon dioxide inlet pipe (10) at the beginning. The inlet of the carbon dioxide inlet pipe (10) is connected to the carbon dioxide inlet port (14). The carbon dioxide inlet port (14) is located at the lower part of the reactor body (1) wall. Multiple carbon dioxide outlet holes (16) are evenly distributed on the inner coil (15) tube.

2. The carbon fractionation reactor according to claim 1, characterized in that, It also includes a stirring shaft (5), on which stirring blades (13) are provided. The upper end of the stirring shaft (5) is connected to a stirring motor (3). The stirring motor (3) is located on the outer side of the top of the reactor body (1). The stirring motor (3) is connected to a speed reducer (4).

3. The carbon fractionation reactor according to claim 2, characterized in that, The stirring blades (13) are double-layered or triple-layered.

4. The carbonation reactor according to claim 1, characterized in that, The diameter of the carbon dioxide outlet (16) is 0.5~2 mm.

5. The carbonation reaction vessel according to claim 1, characterized in that, The reactor body (1) has a manhole (2) at the top and a detachable cover on the manhole (2); the reactor body (1) also has a feed inlet (6) at the top and a discharge outlet (12) at the bottom.

6. The carbonation reactor according to claim 1, characterized in that, The thermometer sleeve (7) is installed inside the reactor body (1).

7. The carbonation reactor according to claim 6, characterized in that, The reactor body (1) is fitted with a jacket (8) on its wall. The upper part of the jacket (8) is provided with a jacket circulation inlet (9), and the bottom of the jacket (8) is provided with a jacket circulation outlet (11).

8. The carbon fractionation reactor according to claim 7, characterized in that, A steam valve is provided at the jacket circulation inlet (9), and a coolant valve is provided at the jacket circulation outlet (11).

9. The carbonation reactor according to claim 1, characterized in that, The carbon dioxide inlet pipe (10) is equipped with a flow regulating valve.

10. The carbonation reactor according to claim 1, characterized in that, The inner coil (15) is a stainless steel coil or a titanium alloy coil.

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