Fully-mixed-flow continuous reaction / heat exchange device

Abstract

The utility model relates to a full-mixed-flow continuous reaction / heat exchange device which structurally comprises a shell, a hollow heat exchange plate, a heat exchange medium inlet trunk, a heat exchange medium outlet trunk and a stirring system, the hollow heat exchange plates are longitudinally arranged in the shell side by side, the stirring systems are transversely arranged in the shell side by side, each stirring system comprises a stirring shaft, the stirring shafts transversely penetrate through all the hollow heat exchange plates, a plurality of stirring paddles are arranged on the stirring shafts, and the stirring paddles are distributed on the two sides of each hollow heat exchange plate. One ends of all the hollow heat exchange plates are simultaneously communicated with the heat exchange medium inlet collecting pipe, and the other ends are simultaneously communicated with the heat exchange medium outlet collecting pipe; a material inlet is formed in one end of the shell, and a material outlet is formed in the other end of the shell. According to the utility model, the full-mixed-flow mixing of liquid materials and the uniformity of the temperature of the liquid materials at all positions can be realized.

Description

Technical Field

[0001] The utility model relates to a heat exchange device, in particular to a full mixed flow continuous reaction / heat exchange device. Background Art

[0002] U-shaped tubular reactors are often used for exothermic or endothermic chemical reactions with slow reaction rates and long material residence times. U-shaped tubular reactors are equipped with porous baffles or agitators within the tubes, which provide high-speed shear and dispersion of the material online, improving mass transfer efficiency. The larger diameter of a U-shaped tubular reactor increases the material residence time within the reactor, allowing for more thorough mixing of the reactants. Therefore, they are suitable for reactions with slower reaction rates. U-shaped tubular reactors have a similar structure to U-shaped tube heat exchangers, a type of shell-and-tube heat exchanger consisting of a tube sheet, shell, and tube bundle. U-shaped tube heat exchangers are relatively simple and inexpensive. U-shaped tube heat exchangers have only one tube sheet, with both ends of the tubes fixed to the same tube sheet. This allows for free expansion and contraction of the tubes, eliminates thermal stress, and provides excellent thermal compensation. A double-pass tube system allows for a longer flow path, higher flow rates, better heat transfer, and greater pressure tolerance. The tube bundle can be removed from the shell for easy maintenance and cleaning, and its structure is simple. For example, U-shaped tubular reactors with porous baffles have been widely used in the polymerization of caprolactam. U-shaped tubular reactors with stirring are suitable for heterogeneous reactions or liquid-solid suspension reactions, such as the continuous nitration of toluene and the continuous sulfonation of anthraquinone.

[0003] However, due to the limited curvature radius of the bends, the heat exchange tubes in U-tube reactors or U-tube heat exchangers are arranged in a smaller number, resulting in larger spacing between the innermost tubes in the tube bundle, low tube sheet utilization, and a tendency for shell-side fluid to short-circuit, hindering heat transfer. When a tube leaks and becomes damaged, only the U-tubes at the outer edge of the bundle are easily replaced. Damaged inner heat exchange tubes cannot be replaced and must be sealed. Furthermore, damaging one U-tube is equivalent to damaging two tubes, resulting in a high scrap rate.

[0004] Although a porous baffle or stirring device is provided inside the tube of the U-shaped tubular reactor, which can disperse the material by high-speed online shearing, it is still impossible to achieve a fully mixed flow state of the material, and the heat exchange efficiency needs to be further improved. Utility Model Content

[0005] The purpose of the utility model is to provide a fully mixed flow continuous reaction / heat exchange device to solve the problem that the existing reactors or heat exchangers cannot achieve a fully mixed flow state of materials and the heat exchange efficiency needs to be further improved.

[0006] The utility model is implemented as follows: a fully mixed flow continuous reaction / heat exchange device, comprising a shell, hollow heat exchange plates, a heat exchange medium inlet manifold, a heat exchange medium outlet manifold and a stirring system; a plurality of the hollow heat exchange plates are longitudinally arranged side by side in the shell, a plurality of the stirring systems are transversely arranged side by side in the shell, the stirring system comprises a stirring shaft, the stirring shaft transversely passes through all the hollow heat exchange plates, a plurality of stirring paddles are arranged on the stirring shaft, and stirring paddles are distributed on both sides of each hollow heat exchange plate, one end of all the hollow heat exchange plates is simultaneously connected to the heat exchange medium inlet manifold and the other end is simultaneously connected to the heat exchange medium outlet manifold, the heat exchange medium inlet manifold is connected to the heat exchange medium inlet extending to the outside of the shell, and the heat exchange medium outlet manifold is connected to the heat exchange medium outlet extending to the outside of the shell; a material inlet is provided at one end of the shell, and a material outlet is provided at the other end of the shell.

[0007] Furthermore, the height of the material outlet is higher than the height of the upper surface of the hollow heat exchange plate in the shell, and the height of the material inlet is higher than the height of the material outlet.

[0008] Furthermore, both ends of the stirring shaft pass through the side walls of the shell, the stirring shaft is connected to the side walls of the shell via a sealing structure, and a driving device is provided at the end of the stirring shaft.

[0009] Furthermore, the shell has a rectangular shape, and the hollow heat exchange plate is a hollow rectangular plate.

[0010] Furthermore, the shell has an outer shape of a horizontal cylindrical tank, and the hollow heat exchange plate is a circular plate.

[0011] Furthermore, the shell has an outer shape of a horizontal semi-cylindrical tank, and the hollow heat exchange plate is a semi-cylindrical plate.

[0012] Furthermore, a vertical inverted U-shaped opening is provided on the hollow heat exchange plate, and the upper end of the inverted U-shaped opening is used for the stirring shaft to pass through.

[0013] Furthermore, all parts of the shell except the top are provided with interlayers, an interlayer medium inlet is provided at the bottom of the interlayer, and an interlayer medium outlet is provided at the top.

[0014] Furthermore, a temperature monitoring port is provided on the shell, on which a temperature sensor for monitoring the temperature of the material in the shell is installed. The height of the temperature monitoring port is lower than the height of the upper surface of the hollow heat exchange plate in the shell.

[0015] The working principle of the present utility model is as follows.

[0016] 1) Working Principle of Exothermic or Endothermic Reaction: Raw materials are added through the material inlet until all hollow heat exchange plates are submerged. Simultaneously, the stirring system is activated, and heat exchange medium is introduced into all hollow heat exchange plates through the heat exchange medium inlet and heat exchange medium inlet manifold. The heat exchange medium within the hollow heat exchange plates is discharged through the heat exchange medium outlet manifold and the heat exchange medium outlet. The heat exchange medium within the hollow heat exchange plates circulates with the external heat exchange medium. A valve adjusts the flow rate of the heat exchange medium, thereby regulating the temperature of the reaction liquid within the shell to meet process requirements. The stirring system maintains a fully mixed flow and uniform temperature throughout the shell. Completely reacted reaction liquid can be discharged from the material outlet. By adjusting the flow rate of the raw materials to ensure that the residence time of the reaction liquid in the shell meets process requirements, the exothermic or endothermic reaction can proceed continuously. The arrangement of n groups of hollow heat exchange plates can improve the rapid cooling or heat absorption of reaction heat. The arrangement of m stirring systems can achieve rapid and efficient mixing of reaction materials, ensuring that the materials are always in a fully mixed flow state, while making the temperature of the reaction liquid uniform throughout the shell. Compared with U-shaped tubular reactors and kettle-type stirred tanks, it has fewer side reactions, less impurities, high raw material conversion rate, high product selectivity, high product quality, and can increase the production capacity of a single device.

[0017] 2) The working principle of efficient heat exchange (heating or cooling) or efficient cooling before crystallization: Liquid material is added through the material inlet until the liquid material submerges all hollow heat exchange plates. At the same time, the stirring system is activated and heat exchange medium is filled into all hollow heat exchange plates through the heat exchange medium inlet and the heat exchange medium inlet manifold. The heat exchange medium in the hollow heat exchange plates is discharged through the heat exchange medium outlet manifold and the heat exchange medium outlet. The heat exchange medium in the hollow heat exchange plates forms a cycle with the external heat exchange medium. The flow rate of the heat exchange medium is adjusted by a valve to adjust the temperature of the reaction liquid in the shell so that the temperature of the liquid material in the shell meets the process requirements. Under the action of the stirring system, the liquid material in the entire shell is fully mixed and the temperature is uniform. By adjusting the flow rate of the liquid material, the liquid material is fully heated or cooled and mixed uniformly in the shell. The liquid material that has completed efficient heat exchange is continuously discharged from the material outlet, realizing continuous feeding and discharging. The setting of n groups of hollow heat exchange plates can improve the rapid cooling or heating of liquid materials. The setting of m stirring systems can achieve rapid and efficient mixing of liquid materials, ensuring that the liquid materials are always in a fully mixed flow state. At the same time, the temperature of the liquid materials in all parts of the shell is uniform. Compared with U-tube heat exchangers, the heat exchange effect is higher, the energy consumption is lower, and the processing capacity of a single device is larger.

[0018] The utility model can be used for exothermic or endothermic chemical reactions with slow reaction rates and long material residence times, ensuring that the reaction liquid is fully mixed, the material temperature at each location in the shell is uniform, with fewer side reactions, less impurities, high raw material conversion rate, high product selectivity, and high product quality.

[0019] The utility model can also be used for full mixed flow high-efficiency heat exchange (heating or cooling) of liquid materials, which can improve the heat exchange efficiency and at the same time make the heat exchange liquid in a full mixed flow state, with uniform liquid temperature, meeting process requirements.

[0020] The utility model can also be used for efficient full-flow mixing and accurate cooling of liquid materials before crystallization, ensuring sufficient mixing of the liquid materials and uniform material temperature at various locations in the shell, thus meeting the requirements of subsequent crystallization processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the top structure of the utility model.

[0022] Figure 2 It is a left-side structural schematic diagram of the present invention.

[0023] Figure 3 This is a schematic diagram of the main structure of the present utility model.

[0024] Figure 4 This is a schematic diagram of the top structure of a single stirring system of the present invention.

[0025] Figure 5 This is a left-side structural schematic diagram of the horizontal cylindrical tank body of the present invention.

[0026] Figure 6 This is a left-side structural schematic diagram of the horizontal semi-cylindrical tank body of the present invention.

[0027] Figure 7 This is a left-side structural diagram of another horizontal semi-cylindrical tank body of the present invention.

[0028] In the figure: 1. Shell; 2. Hollow heat exchange plate; 3. Stirring system; 4. Material inlet; 5. Temperature monitoring port; 6. Driving device; 7. Stirring shaft; 8. Interlayer medium inlet; 9. Heat exchange medium inlet manifold; 10. Interlayer; 11. Heat exchange medium inlet; 12. Discharge port; 13. Sealing structure; 14. Material outlet; 15. Interlayer medium outlet; 16. Heat exchange medium outlet manifold; 17. Heat exchange medium outlet; 18. Stirring paddle; 19. Heat exchange plate support; 20. Manifold support. DETAILED DESCRIPTION

[0029] The embodiments of the present utility model are described below with reference to the accompanying drawings.

[0030] like Figure 1 、 Figure 2 as well as Figure 3 As shown, a fully mixed flow continuous reaction / heat exchange device of the present invention includes a shell 1, a hollow heat exchange plate 2, a heat exchange medium inlet manifold 9, a heat exchange medium outlet manifold 16 and a stirring system 3.

[0031] There are n hollow heat exchange plates 2, where n ≥ 1. These plates 2 are arranged side by side longitudinally within the shell 1, with their lower ends spaced a certain distance from the bottom of the shell 1. One end of each of the hollow heat exchange plates 2 is connected via pipes to a heat exchange medium inlet manifold 9, which is connected to a heat exchange medium inlet 11 extending from the exterior of the shell 1. The other ends of each of the hollow heat exchange plates 2 are connected via pipes to a heat exchange medium outlet manifold 16, which is connected to a heat exchange medium outlet 17 extending from the exterior of the shell 1.

[0032] Each hollow heat exchange plate 2 is used for heat exchange of liquid material, so that the heat in the liquid material is quickly removed or the temperature of the liquid material is quickly increased.

[0033] The heat exchange medium inlet 11 is used to continuously add heat exchange medium at a certain flow rate, and the heat exchange medium outlet 17 is used to continuously discharge the heat exchange medium. The heat exchange medium inlet manifold 9 is used to continuously add heat exchange medium to the hollow heat exchange plates 2 connected to it, and the heat exchange medium outlet manifold 16 is used to collect the heat exchange medium from the hollow heat exchange plates 2 connected to it and continuously discharge it through the heat exchange medium outlet 17.

[0034] Among them, the bottom of one end of the hollow heat exchange plate 2 is connected to the heat exchange medium inlet collection pipe 9 through a pipe, and the top of the other end is connected to the heat exchange medium outlet collection pipe 16 through a pipe. The heat exchange medium enters from the bottom of one end of the hollow heat exchange plate 2, passes through the hollow heat exchange plate 2, and is discharged from the top of the other end of the hollow heat exchange plate 2.

[0035] A heat exchange plate support 19 is provided in the shell 1 , and the hollow heat exchange plate 2 is fixed inside the shell 1 through the heat exchange plate support 19 .

[0036] The heat exchange medium inlet manifold 9 contacts the bottom of the shell through the manifold support 20 , and the heat exchange medium inlet manifold 9 is supported by the manifold support 20 .

[0037] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, there are m stirring systems 3, m ≥ 1, and the stirring systems 3 are arranged horizontally in parallel in the shell 1. The stirring system 3 includes a stirring shaft 7 and a stirring paddle 18. The stirring shaft 7 of each stirring system 3 passes through all the hollow heat exchange plates 2 horizontally. The stirring paddles 18 are evenly installed on the stirring shaft 7. The hollow heat exchange plates 2 are located between adjacent stirring paddles 18, so that stirring paddles 18 are distributed on both sides of each hollow heat exchange plate 2.

[0038] The stirring system 3 is used to mix the liquid materials in various places in the shell 1 evenly and make the temperature of the liquid materials uniform.

[0039] The number of stirring paddles 18 on each stirring system 3 is one greater than the number of hollow heat exchange plates 2 .

[0040] The stirring shaft 7 extends through the sidewalls of the housing 1 at both ends and is connected to the sidewalls of the housing 1 via a sealing structure 13. A drive device 6 is provided at the end of the stirring shaft 7. The sealing structure 13 includes bearings and sealing elements, enabling the stirring shaft 7 to rotate about its own axis while ensuring a tight seal between the housing 1 and the stirring shaft 7. This structure is prior art and will not be described in detail here. The stirring shaft 7 is driven to rotate by the drive device 6, which can specifically be a variable frequency speed motor.

[0041] A material inlet 4 is provided at the upper portion of one end of the shell 1, and a material outlet 14 is provided at the upper portion of the other end. The height of the material outlet 14 is higher than the height of the upper surface of the hollow heat exchange plate 2 in the shell 1, and the height of the material inlet 4 is higher than the height of the material outlet 14.

[0042] The material inlet 4 is used to continuously add liquid material into the shell at a certain flow rate, and the material outlet 14 is used to continuously discharge the reaction liquid after the reaction is completed or the liquid material after heat exchange (heating or cooling) is completed from the shell.

[0043] After the material enters the shell 1 from the material inlet 4 , it enters the gaps between the hollow heat exchange plates 2 arranged in parallel, and flows along the gaps between the hollow heat exchange plates 2 to the rear end to be discharged to the material outlet 14 .

[0044] Specifically, the material inlet 4 can be provided on the left side wall at the front end of the shell 1 , and the material outlet 14 can be provided on the right side wall at the rear end of the shell 1 .

[0045] A discharge port 12 is provided at the bottom of the shell 1 for discharging the material in the shell 1 after the reaction is complete or the heat exchange (temperature increase or temperature decrease) is complete.

[0046] As an embodiment of the present invention, the shell 1 is a rectangular parallelepiped, the hollow heat exchange plate 2 is a hollow rectangular parallelepiped plate, and the outer dimensions of the hollow heat exchange plate 2 are smaller than the shell 1 so that it can be placed inside the shell 1.

[0047] Among them, Figure 1 、 Figure 2 as well as Figure 3 As shown, the number of stirring systems 3 can be multiple, or as Figure 4 As shown, only one stirring system 3 is provided.

[0048] As another embodiment of the present invention, Figure 5 As shown, the shell 1 is in the shape of a horizontal cylindrical tank, and the hollow heat exchange plate 2 is a circular plate.

[0049] As another embodiment of the present invention, Figure 6 As shown, the shell 1 has a horizontal semi-cylindrical tank shape, and the hollow heat exchange plate 2 is a semi-cylindrical plate.

[0050] As another embodiment of the present invention, Figure 7 As shown, in Figure 6 Based on the embodiment shown, a vertical inverted U-shaped opening is provided on the hollow heat exchange plate 2, and the upper end of the inverted U-shaped opening is used for passing the stirring shaft 7. This structure facilitates the installation of the hollow heat exchange plate 2 and the stirring shaft 7.

[0051] As another embodiment of the present invention, Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 As shown, interlayers 10 are provided on all parts of the housing 1 except the top. An interlayer medium inlet 8 is provided at the bottom of the interlayer 10 and an interlayer medium outlet 15 is provided at the top.

[0052] As another embodiment of the present invention, a temperature monitoring port 5 is further provided on the shell 1, and a temperature sensor for monitoring the temperature of the material in the shell 1 is installed on the temperature monitoring port 5. The height of the temperature monitoring port 5 is lower than the height of the upper surface of the hollow heat exchange plate 2 in the shell 1.

[0053] The utility model can be used as a reaction device or as a heat exchange device.

[0054] When used as a reaction device, it can be used for exothermic or endothermic reactions: raw materials are added through the material inlet 4 until all hollow heat exchange plates 2 are submerged. Simultaneously, the stirring system 3 is activated, and heat exchange medium is introduced into all hollow heat exchange plates 2 through the heat exchange medium inlet 11 and the heat exchange medium inlet manifold 9. The heat exchange medium within the hollow heat exchange plates 2 is discharged through the heat exchange medium outlet manifold 16 and the heat exchange medium outlet 17. The heat exchange medium within the hollow heat exchange plates 2 circulates with the external heat exchange medium. A valve adjusts the flow rate of the heat exchange medium, thereby regulating the temperature of the reaction liquid within the shell 1 to meet process requirements. The stirring system 3 maintains a fully mixed flow and uniform temperature throughout the shell 1. Completely reacted reaction liquid can be discharged from the material outlet 14. By adjusting the flow rate of the raw materials, the residence time of the reaction liquid in the shell 1 meets process requirements, enabling continuous exothermic or endothermic reactions.

[0055] The mass of the raw material added from the material inlet 4 is equal to the mass of the material discharged from the material outlet 14 .

[0056] When used as a heat exchanger, it can be used for efficient heat exchange (heating or cooling) or efficient cooling before crystallization: liquid material is added through the material inlet 4 until all hollow heat exchange plates 2 are submerged. Simultaneously, the stirring system 3 is activated, and heat exchange medium is introduced into all hollow heat exchange plates 2 through the heat exchange medium inlet 11 and the heat exchange medium inlet manifold 9. The heat exchange medium in the hollow heat exchange plates 2 is discharged through the heat exchange medium outlet manifold 16 and the heat exchange medium outlet 17. The heat exchange medium in the hollow heat exchange plates 2 circulates with the external heat exchange medium. A valve adjusts the flow rate of the heat exchange medium, thereby regulating the temperature of the reaction liquid in the shell 1 to meet process requirements. The stirring system 3 maintains a fully mixed flow and uniform temperature throughout the shell 1. By adjusting the flow rate of the liquid material, the liquid material is fully cooled or heated within the shell 1 and mixed evenly. The efficiently cooled or heated liquid material is continuously discharged from the material outlet 14, achieving continuous heat exchange (heating or cooling) or efficient cooling of the material.

Claims

1. A fully mixed flow continuous reaction / heat exchange device, characterized in that: It includes a shell, hollow heat exchange plates, a heat exchange medium inlet collection pipe, a heat exchange medium outlet collection pipe and a stirring system; several hollow heat exchange plates are arranged side by side longitudinally in the shell, and several stirring systems are arranged side by side transversely in the shell. The stirring system includes a stirring shaft, which transversely passes through all the hollow heat exchange plates. Several stirring paddles are arranged on the stirring shaft, and stirring paddles are distributed on both sides of each hollow heat exchange plate. One end of all hollow heat exchange plates is connected to the heat exchange medium inlet collection pipe at the same time, and the other end is connected to the heat exchange medium outlet collection pipe at the same time. The heat exchange medium inlet collection pipe is connected to the heat exchange medium inlet extending to the outside of the shell, and the heat exchange medium outlet collection pipe is connected to the heat exchange medium outlet extending to the outside of the shell; a material inlet is provided at one end of the shell, and a material outlet is provided at the other end of the shell.

2. The fully mixed flow continuous reaction / heat exchange device according to claim 1, characterized in that: The height of the material outlet is higher than the height of the upper surface of the hollow heat exchange plate in the shell, and the height of the material inlet is higher than the height of the material outlet.

3. The fully mixed flow continuous reaction / heat exchange device according to claim 1, characterized in that: Both ends of the stirring shaft pass through the side wall of the shell, the stirring shaft is connected to the side wall of the shell through a sealing structure, and a driving device is provided at the end of the stirring shaft.

4. The fully mixed flow continuous reaction / heat exchange device according to claim 1, characterized in that: The shell has a rectangular shape, and the hollow heat exchange plate is a hollow rectangular plate.

5. The fully mixed flow continuous reaction / heat exchange device according to claim 1, characterized in that: The shell has a horizontal cylindrical tank shape, and the hollow heat exchange plate is a circular plate.

6. The fully mixed flow continuous reaction / heat exchange device according to claim 1, characterized in that: The shell has a horizontal semi-cylindrical tank shape, and the hollow heat exchange plate is a semi-cylindrical plate.

7. The fully mixed flow continuous reaction / heat exchange device according to claim 6, characterized in that: A vertical inverted U-shaped opening is provided on the hollow heat exchange plate, and the upper end of the inverted U-shaped opening is used for the stirring shaft to pass through.

8. The fully mixed flow continuous reaction / heat exchange device according to claim 1, characterized in that: Interlayers are arranged on all parts of the shell except the top, an interlayer medium inlet is arranged at the bottom of the interlayer, and an interlayer medium outlet is arranged at the top.

9. The fully mixed flow continuous reaction / heat exchange device according to claim 1, characterized in that: The shell is also provided with a temperature monitoring port, on which a temperature sensor for monitoring the temperature of the material in the shell is installed. The height of the temperature monitoring port is lower than the height of the upper surface of the hollow heat exchange plate in the shell.

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