A dynamic tubular reactor

Abstract

The present invention discloses a dynamic tubular reactor, which belongs to the technical field of chemical equipment, and includes a cylinder and a stirring mechanism. In the stirring mechanism, a first cavity is provided in the first tube sheet assembly; a second cavity is provided in the second tube sheet assembly; two ends of the heat exchange tube are respectively connected to the first tube sheet assembly and the second tube sheet assembly; a reflux branch channel connecting the first cavity and the second cavity is provided in the heat exchange tube; the stirring shaft includes an inner tube and a second outer tube, one end of the second outer tube is fixedly connected to the second tube sheet assembly, and the other end extends out of the reaction chamber and is connected to a driving mechanism; a second reflux main channel is provided in the second outer tube, and the second reflux main channel is connected to the second cavity; the inner tube is provided with an input channel, and the input channel is connected to the first cavity. The stirring mechanism can not only stir the reaction material, but also exchange heat for the reaction material. The heat exchange tube rotates with the stirring shaft, and has a very high heat exchange efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, and in particular to a dynamic tubular reactor. Background Art

[0002] A dynamic tubular reactor is a continuous flow reaction equipment that replaces a drip stirring kettle, and has the advantages of continuous feeding and continuous discharging. However, it is found in actual applications that the existing dynamic tubular reactors have problems of insufficient heat exchange capacity and insufficient material mixing, which affects the reaction efficiency and yield. Tubular reactors in the prior art, such as CN219356221U, disclose a dynamic tubular reactor that can extend the residence time of materials. A fixed spiral tube is wound around the periphery of the stirring shaft. Although material mixing and heat exchange are achieved to a certain extent, the flow rate, mass transfer, and heat exchange efficiency of the reactor are insufficient. It is very necessary to develop and design a dynamic tubular reactor with strong heat exchange capacity, large flow rate, and uniform material mixing. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a dynamic tubular reactor with strong heat exchange capacity and uniform material mixing.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] The present invention provides a dynamic tubular reactor, comprising a barrel and a stirring mechanism, wherein the barrel comprises an inner barrel, a reaction chamber is arranged in the inner barrel, and the stirring mechanism is located in the reaction chamber; the stirring mechanism comprises a stirring shaft, a first tube sheet assembly, a second tube sheet assembly and a plurality of heat exchange tubes;

[0006] A first cavity is provided in the first tube sheet assembly;

[0007] A second cavity is provided in the second tube sheet assembly;

[0008] In the axial direction of the reaction chamber, the first tube sheet assembly and the second tube sheet assembly are arranged at intervals, and the two ends of the heat exchange tube are respectively connected to the first tube sheet assembly and the second tube sheet assembly; a return branch channel is provided in the heat exchange tube, and the return branch channel communicates with the first cavity and the second cavity;

[0009] The stirring shaft includes an inner tube and a second outer tube, one end of the second outer tube is fixedly connected to the second tube sheet assembly, and the other end extends out of the reaction chamber and is transmission-connected to a driving mechanism; a second reflux main channel is provided in the second outer tube, and the second reflux main channel is connected to the second cavity; an input channel is provided in the inner tube, and the input channel is connected to the first cavity.

[0010] In the above-mentioned dynamic tubular reactor, the cylinder further comprises an outer cylinder, which is sleeved on the outer side of the inner cylinder, and an outer heat exchange cavity is formed between the inner cylinder and the outer cylinder;

[0011] And / or, the heat exchange tube is a round tube, a flat tube or a rectangular tube.

[0012] In the above-mentioned dynamic tubular reactor, a plurality of the heat exchange tubes are distributed in the circumferential direction of the reaction chamber.

[0013] In the above-mentioned dynamic tubular reactor, the output end of the inner tube is connected to the first tube sheet assembly, and the input end passes through the second tube sheet assembly and the second outer tube in sequence, forming the second reflux main channel between the inner tube and the second outer tube.

[0014] In the above-mentioned dynamic tubular reactor, the stirring shaft also includes a first outer tube, and the two ends of the first outer tube are respectively connected to the first tube sheet assembly and the second tube sheet assembly; the first outer tube is sleeved on the outside of the inner tube, and a first reflux main channel is formed between the inner tube and the first outer tube, and the first reflux main channel connects the first cavity and the second cavity.

[0015] In the above-mentioned dynamic tubular reactor, the second outer tube is coaxially arranged with the first outer tube;

[0016] And / or, the inner tube is coaxially arranged with the first outer tube;

[0017] And / or, a supporting component is provided between the inner tube and the first outer tube for supporting and positioning the inner tube;

[0018] And / or, the first main return flow channel and the branch return flow channel have the same length.

[0019] In the above-mentioned dynamic tubular reactor, the stirring mechanism is provided with a plurality of groups of the heat exchange tubes, and the number of the heat exchange tubes in each group is 3-20.

[0020] In the above-mentioned dynamic tubular reactor, the outer wall diameter of the first outer tube is D1, and the inner wall diameter of the inner cylinder is D2;

[0021] The stirring mechanism is provided with a group of heat exchange tubes, and the group of heat exchange tubes is distributed in a region with a circumferential diameter of D1+(D2-D1) / 6 to D2-(D2-D1) / 6;

[0022] Alternatively, the stirring mechanism is provided with two groups of the heat exchange tubes, wherein one group of the heat exchange tubes is distributed in an area with a circumferential diameter of D1 to D1+(D2-D1) / 4, and the other group of the heat exchange tubes is distributed in an area with a circumferential diameter of D1+(D2-D1) / 4 to D2.

[0023] In the above-mentioned dynamic tubular reactor, a plurality of heat exchange tubes in the same group are distributed on the same circumference;

[0024] Alternatively, the heat exchange tubes in the same group are distributed on a plurality of circles with different diameters and are staggered in the circumferential direction.

[0025] In the above-mentioned dynamic tubular reactor, the first tube sheet assembly is provided with a support shaft, the support shaft is coaxial with the second outer tube, and the support shaft is rotatably mounted on the inner cylinder.

[0026] The beneficial effects of the present invention are as follows:

[0027] The stirring mechanism of the dynamic tubular reactor is composed of a stirring shaft, a first tube sheet assembly, a second tube sheet assembly and a plurality of heat exchange tubes, wherein the heat exchange tubes can not only stir the reaction materials, but also exchange heat for the reaction materials. Since the heat exchange tubes rotate with the stirring shaft during operation, their heat exchange surface is always a dynamic surface with a small thermal resistance layer and extremely high heat exchange efficiency.

[0028] The overall structure of the stirring mechanism is simple, which is convenient for processing, manufacturing and production promotion. The rotating stirring of the tube bundle components has a strong mass transfer capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the dynamic tubular reactor of the present invention;

[0030] Figure 2 for Figure 1 A magnified image of area A;

[0031] Figure 3 for Figure 1 Enlarged view of area D in the middle;

[0032] Figure 4 It is a schematic diagram of a first distribution state of the heat exchange tube, the first outer tube and the inner cylinder in the dynamic tubular reactor of the present invention;

[0033] Figure 5 It is a schematic diagram of the second distribution state of the heat exchange tube, the first outer tube and the inner cylinder in the dynamic tubular reactor of the present invention.

[0034] In the figure:

[0035] 1-outer cylinder, 2-inner cylinder, 3-stirring mechanism, 4-outer heat exchange chamber, 5-reaction chamber, 6-sealing flange; 7-driving mechanism, 8-supporting mechanism, 9-heat exchange tube, 10-return branch channel, 11-first outer tube, 12-first reflow main channel, 13-inner tube, 14-input channel, 15-supporting component, 16-first tube sheet body, 17-first cavity, 18-first tube sheet cover, 19-supporting shaft, 20-second tube sheet body, 21-second cavity, 22-second tube sheet cover, 23-sealing member, 24-second outer tube, 25-second reflow main channel. DETAILED DESCRIPTION

[0036] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0037] Please refer to Figure 1-Figure 3 , is an embodiment of a dynamic tubular reactor provided by the present invention, comprising a cylinder, the cylinder comprising an inner cylinder 2 and an outer cylinder 1, the outer cylinder 1 is sleeved on the outer side of the inner cylinder 2, and an external heat exchange chamber 4 is formed between the inner cylinder 2 and the outer cylinder 1. A flow-disturbing structure such as a baffle can be provided in the external heat exchange chamber 4 as needed to improve the heat exchange efficiency between the heat exchange medium in the external heat exchange chamber 4 and the inner cylinder 2. The external heat exchange chamber 4 is provided with an external heat exchange medium inlet and an external heat exchange medium outlet, and the heat exchange medium enters the external heat exchange chamber 4 through the external heat exchange medium inlet and then flows out through the external heat exchange medium outlet. A reaction chamber 5 is formed in the inner cylinder 2, and a material inlet and a material outlet are provided on the inner cylinder 2.

[0038] A stirring mechanism 3 is arranged in the inner cylinder 2. The reaction materials enter the reaction chamber 5 from the material inlet and are discharged from the material outlet. The stirring mechanism 3 stirs the reaction materials. At least one end of the stirring mechanism 3 extends out of the reaction chamber 5 and is connected to a driving mechanism 7. The driving mechanism 7 can be driven by a gear set, and a driving motor or other power source can be used to drive the stirring mechanism 3 to rotate in the reaction chamber 5. Supporting and guiding elements such as bearings and sleeves can be arranged between the stirring mechanism 3 and the cylinder. A supporting mechanism 8 can be arranged on the part of the stirring mechanism 3 extending out of the reaction chamber 5. The supporting mechanism 8 is rotatably connected to the stirring mechanism 3 to ensure the rotation stability of the stirring mechanism 3.

[0039] Specifically, the stirring mechanism 3 includes a stirring shaft, a first tube sheet assembly, a second tube sheet assembly, and a plurality of heat exchange tubes 9. Figure 2 As shown, the first tube sheet assembly includes a first tube sheet body 16 and a first tube sheet cover 18, at least one of the two mating surfaces of the first tube sheet body 16 and the first tube sheet cover 18 is concave, and a sealed first cavity 17 is formed between the first tube sheet body 16 and the first tube sheet cover 18. Figure 3As shown, the second tube sheet assembly includes a second tube sheet body 20 and a second tube sheet cover plate 22. At least one of the two mating surfaces of the second tube sheet body 20 and the second tube sheet cover plate 22 is concave, and a second cavity 21 is formed between the second tube sheet body 20 and the second tube sheet cover plate 22.

[0040] It can be understood that the first cavity 17 is not limited to being arranged inside the first tube sheet body 16, but can also be located inside the first tube sheet cover plate 18, or can be located inside both the first tube sheet body 16 and the first tube sheet cover plate 18; the mating surfaces of the first tube sheet body 16 and the first tube sheet cover plate 18 are sealed and connected. The second cavity 21 is also not limited to being arranged inside the second tube sheet body 20, but can also be located inside the second tube sheet cover plate 22, or can be located inside both the second tube sheet body 20 and the second tube sheet cover plate 22; the mating surfaces of the second tube sheet body 20 and the second tube sheet cover plate 22 are sealed and connected.

[0041] In the axial direction of the reaction chamber 5, the first tube sheet assembly and the second tube sheet assembly are arranged at intervals, and a plurality of heat exchange tubes 9 are located between the first tube sheet assembly and the second tube sheet assembly, and the two ends of the heat exchange tubes 9 are respectively connected to the first tube sheet assembly and the second tube sheet assembly; a return branch channel 10 is formed in the heat exchange tube 9, and the return branch channel 10 connects the first cavity 17 and the second cavity 21. The plurality of heat exchange tubes 9 are distributed in the circumferential direction of the reaction chamber 5.

[0042] The stirring shaft includes an inner tube 13, a first outer tube 11 and a second outer tube 24. One end of the second outer tube 24 is connected to the second tube sheet assembly, and the other end passes through the sealing flange at the end of the reaction chamber 5 and extends out of the reaction chamber 5. The second outer tube 24 forms a rotating seal with the sealing flange 6 of the cylinder through the sealing member 23, and the part extending outward from the reaction chamber 5 cooperates and is connected with the support mechanism 8 and the driving mechanism 7. The sealing member 23 can be a sealing member such as a sealing ring and a packing to prevent material leakage. A second reflux main channel 25 is provided in the second outer tube 24, and the second reflux main channel 25 is connected to the second cavity 21.

[0043] An input flow channel 14 is provided in the inner tube 13, and the input flow channel 14 is communicated with the first cavity 17. Preferably, the inner tube 13 is a straight tube, the output end of the inner tube 13 is fixedly connected to the first tube sheet assembly, and the input end passes through the second tube sheet body 20, the second cavity 21 and the second outer tube 24 in sequence and then is connected to an external heat exchange medium circulation supply device; the second return main flow channel 25 is located between the inner tube 13 and the second outer tube 24.

[0044] The first outer tube 11 is sleeved on the outer side of the inner tube 13, and the two ends are connected to the first tube sheet assembly and the second tube sheet assembly respectively. A first return main channel 12 is formed between the inner tube 13 and the first outer tube 11, and the first return main channel 12 communicates with the first cavity 17 and the second cavity 21. Preferably, the second outer tube 24 is coaxially arranged with the first outer tube 11, and the inner tube 13 is positioned and supported by a support component 15. The support component 15 can be a support plate, a support column, etc.

[0045] Furthermore, the inner tube 13 is coaxially arranged with the first outer tube 11 and the second outer tube 24, which facilitates processing and assembly, and the rotation stability of the stirring shaft is good.

[0046] The heat exchange tube 9 is spaced apart from the outer wall of the first outer tube 11; Figure 4 and Figure 5 As shown, the outer wall diameter of the first outer tube 11 is D1, and the inner wall diameter of the inner cylinder 2 is D2. Preferably, a group of heat exchange tubes 9 is provided, and the number of heat exchange tubes 9 in the group is 3-20, and they are arranged in an area with a circumferential diameter of D1+(D2-D1) / 6 to D2-(D2-D1) / 6; preferably, the group of heat exchange tubes 9 is distributed on the same circumference, such as Figure 4 Alternatively, two groups of heat exchange tubes 9 are provided, and the number of heat exchange tubes 9 in each group is 3-20, one group of heat exchange tubes 9 is provided in the area with a circumferential diameter of D1 to D1+(D2-D1) / 4, and the other group of heat exchange tubes 9 is provided in the area with a circumferential diameter of D1+(D2-D1) / 4 to D2; preferably, the two groups of heat exchange tubes 9 are respectively distributed on two circumferences with diameters of d1 and d2, and the two groups of heat exchange tubes 9 are staggered in the circumferential direction, as shown in FIG. Figure 5 As shown. It can be understood that the arrangement of the heat exchange tubes 9 is not limited to the following Figure 4 and attached Figure 5 The state shown is arranged on the premise of taking into account the stirring effect of the reaction materials and the heat exchange effect.

[0047] When in use, the heat exchange tube 9 can not only rotate with the stirring shaft, but also stir the reaction materials in the reaction chamber 5 to fully mix the materials; at the same time, the heat exchange tube 9 can also exchange heat for the reaction materials. The heat exchange medium enters the first cavity 17 through the input flow channel 14 of the inner tube 13, and then a part of the heat exchange medium enters the return branch channel 10 in the heat exchange tube 9, and the other part enters the first return main channel 12; the heat exchange medium in the return branch channel 10 and the first return main channel 12 converges in the second cavity 21, and finally outputs to the heat exchange medium circulation supply equipment through the second return main channel 25; in this process, the stirring mechanism 3 can realize the heat exchange of the reaction materials in the reaction chamber 5 and provide a suitable temperature for the material reaction. In conjunction with the external heat exchange chamber 4, the heat exchange capacity of the reactor can be further improved.

[0048] The heat exchange tube 9 can be a hollow structure such as a round tube, a flat tube, a rectangular tube, a hollow steel belt, etc., to achieve heat exchange with the reaction material and stir the reaction material. The heat exchange tube 9 is preferably a straight tube, extending along the axial direction of the reactor, so that the first return main channel 12 and the return branch channel 10 have the same length; combined with the first cavity 17 and the second cavity 21, the heat exchange medium can smoothly enter and exit the heat exchange tube 9, and the flow rate of the heat exchange medium in the first return main channel 12 and the return branch channel 10 is basically the same, thereby enhancing the heat exchange efficiency.

[0049] The solution of the present application is provided with an inner tube 13, a first outer tube 11 and a second outer tube 24, a heat exchange tube 9, a first tube sheet assembly and a second tube sheet assembly. The heat exchange tube 9 defines a return branch channel 10, the inner tube 13 defines an input channel 14, the inner tube 13 and the first outer tube 11 define a first return main channel 12, the inner tube 13 and the second outer tube 24 define a second return main channel 25, the first tube sheet assembly defines a first cavity 17, and the second tube sheet assembly defines a second cavity 21. The first cavity 17 connects the input channel 14, the first return main channel 12 and the return branch channel 10, and the second cavity 21 connects the first return main channel 12, the second return main channel 25 and the return branch channel 10. The heat exchange area is 1.5-2 times that of the prior art. The heat exchange medium can enter the reactor through the input channel 14 and then flow out from the second return main channel 25, which greatly enhances the heat exchange capacity. Furthermore, the two ends of the heat exchange tube 9 are fixed by the first tube sheet assembly and the second tube sheet assembly, so that the heat exchange tube 9 is reasonably arranged in the area between the first outer tube 11 and the inner cylinder 2, and can rotate with the stirring shaft. The reaction materials shuttle between the heat exchange tube 9 and the first outer tube 11, between the heat exchange tube 9 and the inner cylinder 2, and between different heat exchange tubes 9, so that the reaction materials in the reactor are fully stirred, the mixing and mass transfer of the materials are enhanced, and the flow rate of the reaction materials between the first outer tube 11 and the inner cylinder 2 is increased. At the same time, since the heat exchange tube 9 rotates with the stirring shaft, the heat exchange surface formed by the stirring mechanism 3 is always a dynamic surface, and the heat exchange efficiency is further improved.

[0050] The stirring mechanism 3 can be cantilevered in the reaction chamber 5 of the inner cylinder 2. When the stirring mechanism 3 is long or heavy, a support shaft 19 can be provided on the first tube sheet assembly. The support shaft 19 is coaxial with the second outer tube 24. The support shaft 19 can be rotatably matched with one end of the inner cylinder 2 through a guide device such as a bearing, and a sealing ring, a packing and other sealing components can be provided to prevent material leakage. Exemplarily, the support shaft 19 is provided on the side of the first tube sheet cover 18 away from the first tube sheet body 16.

[0051] Furthermore, the flow direction of the material in the reaction chamber 5 is opposite to the flow direction of the heat exchange medium in the external heat exchange chamber 4, and is also opposite to the flow direction of the heat exchange medium in the reflux branch channel 10; the temperature in the final stage of the material reaction is relatively high, which can further improve the material yield.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dynamic tubular reactor, comprising a cylinder and a stirring mechanism (3), wherein the cylinder comprises an inner cylinder (2), a reaction chamber (5) is arranged in the inner cylinder (2), and the stirring mechanism (3) is located in the reaction chamber (5); characterized in that: The stirring mechanism (3) comprises a stirring shaft, a first tube sheet assembly, a second tube sheet assembly, and a plurality of heat exchange tubes (9); A first cavity (17) is provided in the first tube sheet assembly; A second cavity (21) is provided in the second tube sheet assembly; In the axial direction of the reaction chamber (5), the first tube sheet assembly and the second tube sheet assembly are arranged at intervals, and the two ends of the heat exchange tube (9) are respectively connected to the first tube sheet assembly and the second tube sheet assembly; a return branch channel (10) is provided in the heat exchange tube (9), and the return branch channel (10) is connected to the first cavity (17) and the second cavity (21); a plurality of the heat exchange tubes (9) are distributed in the circumferential direction of the reaction chamber (5); The stirring shaft comprises an inner tube (13) and a second outer tube (24); one end of the second outer tube (24) is fixedly connected to the second tube sheet assembly, and the other end extends out of the reaction chamber (5) and is drivingly connected to a driving mechanism (7); a second main reflux channel (25) is provided in the second outer tube (24), and the second main reflux channel (25) is in communication with the second cavity (21); an input channel (14) is provided in the inner tube (13), and the input channel (14) is in communication with the first cavity (17); The output end of the inner tube (13) is connected to the first tube sheet assembly, and the input end passes through the second tube sheet assembly and the second outer tube (24) in sequence, so that the second reflux main channel (25) is formed between the inner tube (13) and the second outer tube (24); The stirring shaft further comprises a first outer tube (11), the two ends of the first outer tube (11) being respectively connected to the first tube sheet assembly and the second tube sheet assembly; the first outer tube (11) is sleeved on the outer side of the inner tube (13), and a first reflux main channel (12) is formed between the inner tube (13) and the first outer tube (11), the first reflux main channel (12) being connected to the first cavity (17) and the second cavity (21); The inner tube (13), the second outer tube (24) and the first outer tube (11) are coaxially arranged.

2. A dynamic tubular reactor according to claim 1, characterized in that: The cylinder further comprises an outer cylinder (1), wherein the outer cylinder (1) is sleeved on the outer side of the inner cylinder (2), and an outer heat exchange cavity (4) is formed between the inner cylinder (2) and the outer cylinder (1); And / or, the heat exchange tube (9) is a round tube, a flat tube, or a rectangular tube.

3. A dynamic tubular reactor according to claim 1, characterized in that: A supporting component (15) is provided between the inner tube (13) and the first outer tube (11) and is used to support and position the inner tube (13); And / or, the first main return flow channel (12) and the branch return flow channel (10) are of the same length.

4. A dynamic tubular reactor according to claim 1, characterized in that: The stirring mechanism (3) is provided with a plurality of groups of heat exchange tubes (9), and the number of heat exchange tubes (9) in each group is 3-20.

5. A dynamic tubular reactor according to claim 4, characterized in that: The outer wall diameter of the first outer tube (11) is D1, and the inner wall diameter of the inner cylinder (2) is D2; The stirring mechanism (3) is provided with a group of heat exchange tubes (9), and the group of heat exchange tubes (9) are distributed in an area with a circumferential diameter of D1+(D2-D1) / 6 to D2-(D2-D1) / 6; Alternatively, the stirring mechanism (3) is provided with two groups of the heat exchange tubes (9), wherein one group of the heat exchange tubes (9) is distributed in an area with a circumferential diameter of D1 to D1+(D2-D1) / 4, and the other group of the heat exchange tubes (9) is distributed in an area with a circumferential diameter of D1+(D2-D1) / 4 to D2.

6. A dynamic tubular reactor according to claim 4, characterized in that: A plurality of heat exchange tubes (9) in the same group are distributed on the same circumference; Alternatively, a plurality of the heat exchange tubes (9) in the same group are distributed on a plurality of circles with different diameters and are staggered in the circumferential direction.

7. A dynamic tubular reactor according to claim 1, characterized in that: The first tube sheet assembly is provided with a support shaft (19), the support shaft (19) is coaxial with the second outer tube (24), and the support shaft (19) is rotatably mounted on the inner cylinder (2).

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