A self-priming stirrer and hydrogenation reaction apparatus

Abstract

This utility model discloses a self-priming stirrer and a hydrogenation reaction device. The self-priming stirrer includes a stirring shaft with a hollow cavity. The upper end of the hollow cavity is connected to a hydrogen absorption hole formed on the stirring shaft, and the lower end is provided with a hydrogen-distributing impeller. The hydrogen-distributing impeller includes multiple blades evenly distributed around the stirring shaft. Each blade has a hollow jacket. The end of the hollow jacket near the stirring shaft has a hydrogen inlet connected to the hollow cavity, and the end away from the stirring shaft has a gas-liquid outlet. A liquid inlet is provided on the air inlet side along the stirring direction. This utility model optimizes the hydrogen-distributing impeller to achieve large-volume hydrogen absorption and stirring, thereby increasing the gas-liquid reaction rate within a limited space. This allows for a more compact reaction vessel with the same effect, or provides more installation space for circulating heat exchange devices within a reaction vessel of the same volume, further improving the production capacity of batch hydrogenation.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a self-priming stirrer and a hydrogenation reaction device. Background Technology

[0002] A hydrogenation reactor is a high-pressure reaction device used for hydrogenation reactions, commonly known as a "hydrogenation kettle," and is widely used in industries such as chemical, pharmaceutical, and petroleum refining. Hydrogenation reactions typically require high temperature, high pressure, and the presence of a catalyst to introduce hydrogen (H2) into organic compound molecules, thereby altering their chemical properties.

[0003] To achieve temperature control in a hydrogenation reactor, a circulating heat exchanger is typically installed inside the reactor cavity. This inevitably occupies the original gas-liquid stirring space, requiring an increase in the overall volume of the hydrogenation reactor to maintain the original stirring space. Chinese utility model patent CN 216458856 U discloses a reaction system including a reactor, a circulating heat exchanger, a self-priming stirrer, and a flow guide tube. The self-priming stirrer consists of a stirring shaft and stirring blades positioned near the lower end of the stirring shaft. The flow guide tube is fitted around the lower part of the stirring shaft, forming a flow channel extending along the length of the stirring shaft. The circulating heat exchanger is located on the inner wall of the reactor. By using a self-priming stirrer in conjunction with the flow guide tube, the gas-liquid mixture circulates inside and outside the flow guide tube, thereby improving the uniformity of gas distribution within the reactor and thus increasing the reaction rate. While this structural design improves the uniformity of gas-liquid mixing and reduces the overall volume of the reactor to some extent, a certain gap still needs to be reserved between the guide tube and the circulating heat exchange device to ensure the circulation rate of the gas-liquid mixture, thus limiting the radial dimensions of the reactor. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a self-priming stirrer and hydrogenation reaction device. By utilizing a novel hydrogen-separating impeller, it achieves atmospheric hydrogen absorption and stirring, thereby increasing the gas-liquid reaction rate within a limited space. This allows for a more compact reactor while maintaining the same performance, or provides more space for the installation of circulating heat exchange devices within a reactor of the same volume, further improving the production capacity of reactor-type hydrogenation.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A self-priming stirrer includes a stirring shaft with a hollow cavity. The upper end of the hollow cavity is connected to a hydrogen absorption hole formed on the stirring shaft, and the lower end is provided with a hydrogen separating impeller. The hydrogen separating impeller includes multiple blades evenly distributed along the circumference of the stirring shaft. Each blade has a hollow interlayer. The end of the hollow interlayer near the stirring shaft is provided with a hydrogen inlet communicating with the hollow cavity, and the end away from the stirring shaft is provided with a gas-liquid outlet. A liquid inlet is provided on the air inlet surface along the stirring direction.

[0007] Furthermore, the hydrogen separator impeller includes a mounting base that is sealed and fixed on the stirring shaft. The stirring shaft has a hydrogen outlet hole that communicates with the hollow cavity. The mounting base has a hydrogen separation channel, and the hydrogen inlet is connected to the hydrogen outlet hole through the hydrogen separation channel.

[0008] Furthermore, the hydrogen separation channel includes multiple sets of through holes that correspond one-to-one with the impeller blades and extend radially along the stirring shaft. Multiple sets of hydrogen outlet holes are uniformly arranged along the circumference of the stirring shaft and are coaxially aligned and connected with the through holes and the hydrogen inlet, respectively.

[0009] Furthermore, the mounting base is coaxially provided with an annular cavity, the inner side of which has an annular opening, and the outer side is provided with a through hole coaxially aligned with the hydrogen inlet, forming the hydrogen separation channel.

[0010] Furthermore, the blades are provided in four sets, and the projected surface of the blades is a slender arc-shaped surface, including a first arc segment, a straight segment, a second arc segment, and a circular arc segment connected in sequence. The tangent angle between the straight segment and the first arc segment is 55° to 60°. The blade width ratio at the two ends of the second arc segment near the circular arc segment and away from the circular arc segment is 1:2. The curvature of the second arc segment is 1 ± 0.05.

[0011] Furthermore, the hydrogen-dispersing impeller is provided with upper and lower reinforcing rings, and the middle part of the blades is fixedly connected to the reinforcing rings.

[0012] Furthermore, the lower end of the stirring shaft is coaxially fixed to a propeller impeller, and the shaft section of the stirring shaft located between the propeller impeller and the hydrogen separation impeller is a hollow structure.

[0013] A hydrogenation reaction apparatus includes a reactor, a motor drive assembly mounted on top of the reactor, and a self-priming stirrer as described above inserted inside the reactor. The top of the stirring shaft of the self-priming stirrer is coaxially and fixedly connected to the output end of the motor drive assembly. A guide tube is coaxially sleeved around the hydrogen-distributing impeller. A circulating heat exchange device is provided between the guide tube and the inner wall of the reactor. The circulating heat exchange device includes multiple layers of coils evenly spaced along the radial direction of the reactor. Annular heat exchange tubes are evenly spaced along the axial direction of the reactor on the coils. The heat exchange tubes are interconnected to form a heat exchange channel.

[0014] Furthermore, multiple diversion holes are uniformly opened on the side wall of the guide tube. When the liquid in the reactor is stirred at high speed, it flows to the circulating heat exchange device through the diversion holes, thereby changing the liquid phase flow field in the reactor and having a scouring effect on the surface of the heat exchange tube.

[0015] Furthermore, the diversion hole includes a first elongated hole and a second elongated hole extending along the axial direction of the guide tube, wherein the length of the first elongated hole is less than that of the second elongated hole.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] (1) This utility model optimizes the structure of traditional self-priming stirring blades by adding a liquid inlet to the blades with hollow jackets, forming a hydrogen-dispersing impeller with higher dispersion efficiency. Compared with the traditional stirring blades that only have gas outlets, when the impeller rotates at high speed, the liquid first enters the hollow jacket of each blade and comes into full contact with the hydrogen gas that is drawn into the hollow jacket of each blade under negative pressure. Then it is thrown out at high speed from the gas-liquid outlet, which changes the traditional gas-liquid mixing method and realizes a larger volume of hydrogen absorption and stirring. This improves the gas-liquid reaction rate in a limited space, and thus achieves a smaller reactor or provides more space for the installation of circulating heat exchange devices in a reactor of the same volume under the same effect, further improving the production capacity of the reactor hydrogenation.

[0018] (2) This utility model provides two different hydrogen separation channels. When a hydrogen separation channel with a through hole structure is used, the structure is simple. During assembly, it is necessary to ensure that each through hole is aligned with the hydrogen outlet hole. When a hydrogen separation channel with an annular structure is used, it is only necessary to ensure that the hydrogen outlet hole is located inside the annular opening, which reduces the assembly requirements.

[0019] (3) This utility model, through the design of a specially shaped blade, can achieve excellent hydrogen absorption and dispersion effects through simulation testing.

[0020] (4) By setting a reinforcing ring, this utility model improves the structural strength of the blade and avoids the hollow blade from deforming and failing during high-speed operation.

[0021] (5) This utility model accelerates liquid circulation by adding a propulsion impeller and works in conjunction with a hydrogen separator impeller to make the gas-liquid distribution in the hydrogenation reactor more uniform and the reaction temperature more uniform. By setting the shaft section between the propulsion impeller and the hydrogen separator impeller to a hollow structure, the weight of the lower part of the stirring shaft is reduced, thereby achieving a better stirring effect.

[0022] (6) The reaction device of this utility model adopts a self-priming stirrer with a brand-new structural design, which can achieve a larger hydrogen absorption effect and improve the gas-liquid reaction rate. At the same time, the existing guide tube structure is optimized. By opening a diversion hole on the side, the guide tube can change the liquid phase flow field in the vessel while realizing the flow guidance, and has a scouring effect on the surface of the heat exchange tube. Some liquid flows to the outer peripheral circulating heat exchange device through the diversion hole, thereby cleaning it and preventing the catalyst in the vessel from accumulating on its surface, generating violent reactions to form a high temperature zone, and thus generating more high-boiling substances and sintering and deactivating the catalyst.

[0023] (7) The diversion hole of this utility model is composed of two kinds of long strip holes with different lengths. Compared with the round hole, it can reduce fluid resistance and achieve a better cleaning effect. At the same time, the length difference design ensures that the guide tube has sufficient structural strength and avoids deformation due to excessive opening area after long-term use, which affects the diversion effect. Attached Figure Description

[0024] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0025] Figure 1 This is a simplified structural diagram of the present invention;

[0026] Figure 2 This is a simplified structural diagram of the hydrogen-separating impeller of this utility model;

[0027] Figure 3 This is a simplified diagram of the blade structure of this utility model;

[0028] Figure 4 This is a simplified diagram of the propulsion impeller structure of this utility model;

[0029] Figure 5 This is a simplified structural diagram of the guide tube of this utility model.

[0030] The labels in the attached diagram are:

[0031] 1. Reactor; 2. Motor drive assembly; 3. Guide tube; 3. First elongated hole; 3-1. Second elongated hole; 3-2. Circulating heat exchange device; 4. Coil; 4-1. Annular heat exchange tube; 5. Stirring shaft; 5. Hydrogen absorption hole; 5-1. Hydrogen outlet hole; 5-2. Hydrogen separator impeller; 6. Blade; 6-1. First arc segment; 6-1-1. Straight segment; 6-1-2. Second arc segment; 6-1-3. Circular arc segment; 6-1-4. Hydrogen inlet; 6-2. Gas-liquid outlet; 6-3. Liquid inlet; 6-4. Mounting base; 6-5. Hydrogen separator channel; 6-6. Reinforcing ring; 6-7. Propeller impeller; 7. Detailed Implementation

[0032] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0033] (Example 1)

[0034] like Figures 1 to 5 The hydrogenation reactor shown includes a reactor 1, a motor drive assembly 2, a self-priming stirrer, a flow guide tube 3, and a circulating heat exchange device 4. The self-priming stirrer includes a stirring shaft 5 with a hollow cavity. The upper end of the hollow cavity is connected to a hydrogen absorption hole 5-1 formed on the stirring shaft 5, and the lower end is equipped with a hydrogen separating impeller 6. The motor drive assembly 2 is fixedly mounted on the top of the reactor 1, and its output end is coaxially connected to the stirring shaft 5 of the self-priming stirrer inserted inside the reactor 1, for driving its rotation. The flow guide tube 3 is coaxially sleeved outside the hydrogen separating impeller 6, allowing the gas-liquid mixture to circulate inside and outside the flow guide tube. The circulating heat exchange device 4 is located between the flow guide tube 3 and the inner wall of the reactor 1, for controlling the reaction temperature. By optimizing the structure of the hydrogen separator impeller 6, a larger volume of hydrogen absorption and stirring is achieved, thereby increasing the gas-liquid reaction rate within a limited space. This allows for a smaller reactor with the same effect, or provides more space for the installation of circulating heat exchange devices within a reactor of the same volume, further improving the production capacity of the reactor hydrogenation process.

[0035] Specifically, the hydrogen separator impeller 6 includes four sets of blades 6-1 evenly distributed circumferentially along the stirring shaft 5. Each blade 6-1 has a hollow jacket. The end of the hollow jacket near the stirring shaft 5 has a hydrogen inlet 6-2 that connects to the hollow cavity, and the end away from the stirring shaft has a gas-liquid outlet 6-3. A liquid inlet 6-4 is provided on the air inlet side along the stirring direction. Compared with the traditional structure of stirring blades that only have a gas outlet, by adding the liquid inlet 6-4, when the hydrogen separator impeller 6 rotates at high speed, the liquid in the reactor 1 first enters the hollow jacket of each blade 6-1, and comes into full contact with the hydrogen gas that is drawn into the hollow jacket of each blade 6-1 under negative pressure. Then, it is thrown out at high speed from the gas-liquid outlet, changing the traditional gas-liquid mixing method.

[0036] To facilitate communication between the impeller 6-1 and the hollow interlayer, the hydrogen separator impeller 6 in this embodiment also includes a mounting base 6-5. The mounting base 6-5 is fixedly mounted on the stirring shaft 5 by screws, connecting keys, and sealing rings. The stirring shaft 5 has a hydrogen outlet hole 5-2 that communicates with the hollow cavity. The mounting base has a hydrogen separation channel 6-6, and the hydrogen inlet 6-2 communicates with the hydrogen outlet hole 5-2 through the hydrogen separation channel 6-6. The hydrogen separation channel 6-6 includes four sets of through holes that correspond one-to-one with the impeller 6-1 and extend radially along the stirring shaft 5. The hydrogen outlet holes 5-2 are evenly arranged in four sets along the circumference of the stirring shaft 5 and are coaxially aligned and communicated with the through holes and the hydrogen inlet 6-2, respectively.

[0037] To achieve better hydrogen absorption and dispersion, a specially shaped blade was obtained through simulation testing. Specifically, the projection surface of the blade 6-1 in this embodiment is a slender arc-shaped surface, including a first arc segment 6-1-1, a straight line segment 6-1-2, a second arc segment 6-1-3, and a circular arc segment 6-1-4 connected in sequence. The angle between the tangent of the straight line segment 6-1-2 and the first arc segment 6-1-1 is 55° to 60°. The blade width ratio at the two ends of the second arc segment near and away from the circular arc segment is 1:2. At the same time, the curvature of the second arc segment is 1 ± 0.05.

[0038] Considering that the impeller blades of the hydrogen separator 6 are hollow, in order to ensure structural strength, this embodiment provides reinforcing rings 6-7 on both the top and bottom of the hydrogen separator 6. The upper and lower surfaces of the middle part of the blade 6-1 are respectively fixed to the reinforcing rings 6-7 to prevent the hollow blades from deforming and failing during high-speed operation.

[0039] To accelerate liquid circulation within the reactor 1, this embodiment features a propeller impeller 7 coaxially fixed to the lower end of the stirring shaft 5. This impeller works in conjunction with the hydrogen separator impeller 6 to achieve a more uniform gas-liquid distribution and reaction temperature within the hydrogenation reactor 1. The section of the stirring shaft 5 located between the propeller impeller 7 and the hydrogen separator impeller 6 is also a hollow structure and is isolated from the hollow chamber, thereby reducing the weight of the lower part of the stirring shaft and achieving a superior stirring effect.

[0040] The circulating heat exchange device 4 includes multiple layers of coils 4-1 evenly spaced radially along the reactor 1. Annular heat exchange tubes 4-2 are evenly spaced axially along the reactor 1 on the coils 4-1, and the heat exchange tubes 4-2 are interconnected to form heat exchange channels. To prevent catalyst accumulation on the surface of the reactor, which could lead to violent reactions and the formation of high-temperature zones, resulting in more high-boiling-point substances and catalyst deactivation through sintering, this embodiment features multiple diversion holes uniformly opened on the side wall of the guide tube 3. When the liquid in the reactor 1 is stirred at high speed, it flows through these diversion holes to the circulating heat exchange device, thereby cleaning the device. The diversion holes include a first elongated hole 3-1 and a second elongated hole 3-2 extending axially along the guide tube 3. Compared to round holes, these holes reduce fluid resistance and achieve better cleaning results. Furthermore, the length of the first elongated hole 3-1 is shorter than that of the second elongated hole 3-2, preventing excessively large opening areas that could deform over long-term use and affect the flow guiding effect.

[0041] (Example 2)

[0042] The structure of this embodiment is similar to that of Embodiment 1, except that the mounting base 6-5 has a coaxial annular cavity with an annular opening on the inner side and a through hole on the outer side that is coaxially aligned with the hydrogen inlet 6-2, forming a hydrogen separation channel 6-6. When using an annular hydrogen separation channel, it is only necessary to ensure that the hydrogen outlet is located within the annular opening, which reduces the assembly requirements.

[0043] This invention utilizes a specially structured guide tube to distribute the absorbed hydrogen gas online, improving the contact efficiency between the catalyst and hydrogen, thus increasing reaction efficiency. Simultaneously, it effectively works in conjunction with a self-priming stirrer to achieve real-time cleaning of the circulating heat exchange device 4. By optimizing the structure of the hydrogen separator impeller, a large-volume hydrogen-absorbing stirrer is implemented, thereby re-absorbing unreacted hydrogen gas from the total gas phase in the hydrogenation reactor and sending it back into the reaction system, improving hydrogen utilization efficiency and increasing the reaction rate. Because the impeller's high suction capacity reduces the volume of the gas distributor, more space can be allocated to install heat exchange tubes, increasing the production capacity of the reactor hydrogenation process by 50% for the same volume.

[0044] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A self-priming stirrer, comprising a stirring shaft, the stirring shaft having a hollow cavity, the upper end of the hollow cavity being connected to a hydrogen absorption hole formed on the stirring shaft, and the lower end being provided with a hydrogen separating impeller, characterized in that: The hydrogen separator impeller includes multiple blades evenly distributed around the stirring shaft. Each blade has a hollow jacket. The end of the hollow jacket near the stirring shaft has a hydrogen inlet that communicates with the hollow cavity, and the end away from the stirring shaft has a gas-liquid outlet. A liquid inlet is provided on the air inlet side along the stirring direction.

2. The self-priming stirrer according to claim 1, characterized in that: The hydrogen separator impeller includes a mounting base that is sealed and fixed on the stirring shaft. The stirring shaft has a hydrogen outlet hole that communicates with the hollow cavity. The mounting base has a hydrogen separation channel, and the hydrogen inlet is connected to the hydrogen outlet hole through the hydrogen separation channel.

3. A self-priming stirrer according to claim 2, characterized in that: The hydrogen separation channel includes multiple sets of through holes that correspond one-to-one with the impeller blades and extend radially along the stirring shaft. Multiple sets of hydrogen outlet holes are uniformly arranged along the circumference of the stirring shaft and are coaxially aligned and connected with the through holes and the hydrogen inlet, respectively.

4. A self-priming stirrer according to claim 2, characterized in that: The mounting base has a coaxial annular cavity, the inner side of which has an annular opening, and the outer side has a through hole aligned coaxially with the hydrogen inlet, forming the hydrogen separation channel.

5. A self-priming stirrer according to claim 1, characterized in that: The blades are provided in four sets, and the projected surface of the blades is a slender arc surface, including a first arc segment, a straight segment, a second arc segment and a circular arc segment connected in sequence. The angle between the tangent of the straight segment and the first arc segment is 55°~60°. The blade width ratio at the two ends of the second arc segment near the circular arc segment and away from the circular arc segment is 1:

2. The arc of the second arc segment is 1±0.

05.

6. A self-priming stirrer according to claim 1, characterized in that: The hydrogen-dispersing impeller is equipped with a reinforcing ring, and the middle part of each blade is fixedly connected to the reinforcing ring.

7. A self-priming stirrer according to any one of claims 1 to 6, characterized in that: The lower end of the stirring shaft is coaxially fixed to a propeller impeller, and the shaft section between the propeller impeller and the hydrogen separator impeller is a hollow structure.

8. A hydrogenation reaction apparatus, characterized in that: The device includes a reactor, a motor drive assembly mounted on top of the reactor, and a self-priming stirrer as described in any one of claims 1 to 7 inserted inside the reactor. The top of the stirring shaft of the self-priming stirrer is coaxially and fixedly connected to the output end of the motor drive assembly. A guide tube is coaxially sleeved around the hydrogen separating impeller. A circulating heat exchange device is provided between the guide tube and the inner wall of the reactor. The circulating heat exchange device includes multiple layers of coils evenly spaced along the radial direction of the reactor. Annular heat exchange tubes are evenly spaced along the axial direction of the reactor on the coils. The heat exchange tubes are interconnected to form a heat exchange channel.

9. A hydrogenation reaction apparatus according to claim 8, characterized in that: Multiple diversion holes are evenly opened on the side wall of the guide tube, and the liquid in the reactor flows to the circulating heat exchange device through the diversion holes when it is stirred at high speed.

10. A hydrogenation reaction apparatus according to claim 9, characterized in that: The diversion hole includes a first elongated hole and a second elongated hole extending axially along the guide tube, wherein the length of the first elongated hole is less than that of the second elongated hole.

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