Spiral belt type static mixer

Abstract

The utility model relates to a spiral belt type static mixer, which is used for fully mixing fluid for heat exchange, is connected with a heating medium device and comprises a first pipeline and a second pipeline sleeved outside the first pipeline, and both the first pipeline and the second pipeline are connected with the heating medium device. A fluid channel for fluid to flow is arranged between the first pipeline and the second pipeline; a plurality of mixing units are arranged in the fluid channel, a spiral channel consisting of a plurality of spiral bands is arranged in each mixing unit, fluid is mixed in the spiral channels, and the spiral channels in the adjacent mixing units are opposite in rotation direction. According to the utility model, by arranging the mixing units with opposite rotation directions, the fluid mixing effect is enhanced; no obvious dead zone exists in a fluid channel, and the problem that the heat exchange effect is poor due to the too thick boundary layer is solved; the second pipeline on the outer side and the first pipeline on the inner side can convey heat transfer media at the same time, the overall heat exchange effect of the pipeline can be remarkably enhanced, and the fluid temperature is more uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of static mixers, in particular to a spiral ribbon type static mixer. Background Art

[0002] High-viscosity fluids tend to flow in a laminar state within tubes, with a parabolic velocity distribution, where the fluid in the center has a higher velocity and the fluid at the edges has a lower velocity, forming a thicker boundary layer. Furthermore, due to the high viscosity, molecular diffusion plays a less significant role. Therefore, during heat transfer, heat exchange occurs only between the fluid near the wall and the heat exchange wall, while the boundary layer hinders heat exchange between the fluid in the center of the tube and the wall. Consequently, heat exchange equipment for high-viscosity fluids is generally inefficient. Increasing fluid velocity can increase the surface heat transfer coefficient, but this can lead to greater resistance losses and increased pump consumption, thus limiting fluid velocity. Improving the heat transfer efficiency of heat exchangers using high-viscosity fluids while controlling the increase in pump power has become a hot topic.

[0003] A static mixer is a highly efficient mixing device with no moving parts. Its basic working mechanism is to utilize a mixing unit fixed within a tube to alter the flow state of the fluid within the tube, achieving good dispersion and thorough mixing between different fluids. This creates near-plug flow behavior, effectively disrupting or weakening the development of the boundary layer at the tube wall, and effectively improving the heat and mass transfer efficiency of highly viscous fluids. It has the advantages of a narrow residence time distribution, a large interfacial area, minimal space requirements, low maintenance costs, and ease of installation. Due to these advantages, static mixers have received extensive attention and research in recent decades, and a variety of different structural types have been developed.

[0004] For some temperature-sensitive materials, if the temperature field inside the tube is uneven, the properties of the outlet materials will be unstable, which is not conducive to industrial production. Therefore, it is particularly important to homogenize the temperature field of the logistics in the tube and improve the temperature efficiency of the heat exchanger. Chinese patent CN118454496A discloses a staggered rod swirl chemical static mixer, which forms left-handed rod elements and right-handed rod elements by staggering a plurality of spoke-type rods. The two elements are alternately arranged in the mixing tube and staggered at a certain angle at the interface. Under the action of the rod elements, the fluid forms a spiral flow with alternating rotation direction, thereby enhancing the heat transfer and mixing process. For high-viscosity fluids, this patent will produce a large number of dead zones in the flow direction, causing the high-viscosity fluid to accumulate in the tube, and long-term heating will lead to deterioration; at the same time, the larger axial fluid and static mixer contact area will produce a higher pressure drop, which will put a greater test on the firmness and energy consumption of the elements; at the same time, since the static mixer can only exchange heat on one side, it is easy to cause uneven temperature field of the fluid in the tube. Chinese patent CN221637788U discloses a combined mixing element, comprising a cylindrical porous channel and a multi-spiral module. The cylindrical porous channel and the multi-spiral module are coaxially arranged, in the order of cylindrical porous channel, multi-spiral module, and cylindrical porous channel. The cylindrical porous channel is evenly distributed, allowing the liquid to be fully diverted. The spiral blades of any multi-spiral module have the same rotation direction, while the spiral blades of two adjacent multi-spiral modules have opposite rotation directions. This combined mixing element evenly divides the inner cavity of the shell, increases the contact area between the liquid and the spiral blades, and improves the mixing efficiency of liquid-liquid mixing. However, high-viscosity fluids are easily clogged in the cylindrical porous channel, resulting in increased pressure drop in the tube and uneven distribution of the fluid in the tube. At the same time, since the static mixer can only exchange heat on one side, it also causes the problem of uneven temperature field of the fluid in the tube.

[0005] Therefore, in order to solve the above problems, it is necessary for technical personnel in this field to design a spiral ribbon static mixer that can fully mix and exchange heat for high-viscosity fluids without producing a large number of dead zones, and at the same time have an in-tube static mixing structure that can have a good homogenizing effect on the fluid temperature field. Utility Model Content

[0006] The purpose of the utility model is to provide a spiral ribbon static mixer.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a spiral ribbon static mixer, which is used to fully mix the fluid for heat exchange, is connected to the heat medium device, includes a first pipe, and a second pipe arranged outside the first pipe, the first pipe and the second pipe are both connected to the heat medium device, and a fluid channel for fluid flow is provided between the first pipe and the second pipe; a plurality of mixing units are provided in the fluid channel, each mixing unit is provided with a spiral channel composed of a plurality of spiral ribbons, the fluid is mixed in the spiral channel, and the spiral channels in adjacent mixing units have opposite rotation directions.

[0008] Preferably, flanges are provided at both ends of the spiral ribbon static mixer for connection with a preceding process device to ensure pipeline sealing.

[0009] Preferably, there is no gap between adjacent mixing units, and the spiral bands at the junction of adjacent mixing units are not connected; the entire static mixer structure has no obvious dead zone, and high viscosity to medium and low viscosity fluids are not easy to accumulate in the tube, avoiding the problem of poor heat exchange effect due to excessively thick boundary layer.

[0010] In the above, the spiral channels in adjacent mixing units rotate in opposite directions, so that the fluids can collide and mix at the point where the rotation directions of adjacent spiral channels change. Low-viscosity fluids can even generate turbulence at high flow rates, thereby enhancing the fluid mixing effect.

[0011] In the above, the opposite rotation directions of the spiral channels in adjacent mixing units means that when the fluid in one spiral channel rotates in a clockwise direction, the fluid in the adjacent spiral channel rotates in a counterclockwise direction.

[0012] Preferably, the fluid channel consists of a gap between the first conduit and the second conduit.

[0013] Preferably, the length and width of the fluid channel are adjusted according to the residence time of the fluid in the fluid channel.

[0014] Preferably, a first heat medium inlet is provided at one end of the first pipe, a first heat medium outlet is provided at the other end of the first pipe, and the inner tube of the first pipe, the first heat medium inlet and the first heat medium outlet are connected.

[0015] Preferably, the first heat medium inlet is located below the first pipe, and the first heat medium outlet is located above the first pipe.

[0016] In the above, the first heat medium inlet and the first heat medium outlet are respectively connected to the heat medium device, and the heat medium flows in the inner tube of the first pipe. The heat medium in the heat medium device enters the first pipe from the bottom and exits from the top, ensuring that the heat medium can fully fill the pipe and does not accumulate gas in the pipe to affect the heat exchange effect.

[0017] Preferably, the second pipe is a double-layer pipe, comprising an inner pipe and an outer pipe sleeved outside the inner pipe, with a gap between the inner pipe and the outer pipe.

[0018] Preferably, a second heat medium inlet is provided at one end of the second pipe, a second heat medium outlet is provided at the other end of the second pipe, and the second heat medium inlet, the second heat medium outlet and the gap between the inner pipe and the outer pipe are connected.

[0019] Preferably, the second heat medium inlet is located below the second pipe, and the second heat medium outlet is located above the second pipe.

[0020] In the above, the second heat medium inlet and the second heat medium outlet are respectively connected to the heat medium device. The heat medium flows in the gap between the inner pipe and the outer pipe. The heat medium in the heat medium device enters the second pipe from the bottom and exits from the top, ensuring that the heat medium can fully fill the pipe and does not accumulate gas in the pipe to affect the heat exchange effect.

[0021] Preferably, the first heat medium inlet and the second heat medium inlet are located on the same side of the spiral ribbon static mixer.

[0022] Preferably, the spiral belt is integrally formed with the first pipe, welded or detachably connected.

[0023] Preferably, the height of the spiral ribbon in each mixing unit is the same, which is the same as the height of the fluid channel.

[0024] Preferably, the length, quantity, thickness and material of the spiral ribbons in each mixing unit are the same or different.

[0025] Preferably, the thickness of the spiral tape is 0.01 to 5 mm.

[0026] Preferably, the thickness of the spiral belt is calculated based on the strength of the spiral belt material and the pressure drop requirements of the first pipeline and the second pipeline, and is more preferably 0.05 to 1 mm.

[0027] Preferably, the length of the spiral belt is adjusted according to the lengths of the first pipe and the second pipe.

[0028] Preferably, the rotation angle of the spiral channel in the mixing unit is 30°-60°.

[0029] Preferably, the rotation angles of the spiral channels in each mixing unit are the same or different, and the rotation angles are adjusted according to the pressure drop and mixing effect of the first pipeline and the second pipeline.

[0030] Due to the application of the above technical solution, the beneficial effects of the utility model are:

[0031] 1. The utility model sets the rotation directions of adjacent spiral ribbon units in opposite directions, so that the fluids can collide and mix at the point where the spiral ribbon units change direction. After passing through different mixing units, the fluids are divided and reorganized to form new mixed flows, which has a better mixing effect. Low-viscosity fluids can even generate turbulence at high flow rates, thereby enhancing the fluid mixing effect.

[0032] 2. The static mixer structure of this utility model has no significant dead zones, making it difficult for high-viscosity, medium-viscosity, and low-viscosity fluids to accumulate within the tube, thus avoiding the problem of poor heat transfer due to a thick boundary layer. The static mixer occupies a small volume within the tube, minimizing overall pressure drop within the tube and contributing to energy savings.

[0033] 3. This invention adds a second pipe outside the fluid channel. The second pipe can transport heat transfer medium simultaneously with the first pipe inside the spiral belt, significantly enhancing the heat exchange effect of the entire pipeline and making the fluid temperature in the static mixer more uniform. The heat medium enters the pipeline from the bottom and exits from the top, ensuring that the pipeline is fully filled with heat medium and preventing gas accumulation in the pipeline that affects the heat exchange effect.

[0034] 4. The utility model has a simple structure and is easy to use, thus meeting the needs of production and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, some of the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present utility model.

[0037] Figure 2 For this utility model Figure 1 Schematic diagram of the structure of the spiral ribbon.

[0038] Among them, 1. first pipeline; 2. second pipeline; 3. fluid channel; 4. mixing unit; 5. spiral belt; 6. first heat medium inlet; 7. first heat medium outlet; 8. inner tube; 9. inner layer pipeline; 10. outer layer pipeline; 11. second heat medium inlet; 12. second heat medium outlet. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] Example 1

[0041] like Figure 1 and Figure 2 As shown, a spiral ribbon static mixer is used to fully mix the fluid for heat exchange and is connected to a heat medium device. It includes a first pipe 1 and a second pipe 2 arranged outside the first pipe. The first pipe and the second pipe are both connected to the heat medium device. A fluid channel 3 for fluid flow is provided between the first pipe and the second pipe; a plurality of mixing units 4 are provided in the fluid channel, and each mixing unit is provided with a spiral channel composed of a plurality of spiral ribbons 5. The fluid is mixed in the spiral channel, and the spiral channels in adjacent mixing units rotate in opposite directions.

[0042] Preferably, flanges are provided at both ends of the spiral ribbon static mixer for connection with a preceding process device to ensure pipeline sealing.

[0043] Preferably, there is no gap between adjacent mixing units, and the spiral bands at the junction of adjacent mixing units are not connected; the entire static mixer structure has no obvious dead zone, and high viscosity to medium and low viscosity fluids are not easy to accumulate in the tube, avoiding the problem of poor heat exchange effect due to excessively thick boundary layer.

[0044] In the above, the spiral channels in adjacent mixing units rotate in opposite directions, so that the fluids can collide and mix at the point where the rotation directions of adjacent spiral channels change. Low-viscosity fluids can even generate turbulence at high flow rates, thereby enhancing the fluid mixing effect.

[0045] In the above, the opposite rotation directions of the spiral channels in adjacent mixing units means that when the fluid in one spiral channel rotates in a clockwise direction, the fluid in the adjacent spiral channel rotates in a counterclockwise direction.

[0046] Preferably, the fluid channel consists of a gap between the first conduit and the second conduit.

[0047] Preferably, the length and width of the fluid channel are adjusted according to the residence time of the fluid in the fluid channel.

[0048] Preferably, a first heat medium inlet 6 is provided at one end of the first pipe, a first heat medium outlet 7 is provided at the other end of the first pipe, and the inner tube 8 of the first pipe, the first heat medium inlet and the first heat medium outlet are connected.

[0049] Preferably, the first heat medium inlet is located below the first pipe, and the first heat medium outlet is located above the first pipe.

[0050] In the above, the first heat medium inlet and the first heat medium outlet are respectively connected to the heat medium device, and the heat medium flows in the inner tube of the first pipe. The heat medium in the heat medium device enters the first pipe from the bottom and exits from the top, ensuring that the heat medium can fully fill the pipe and does not accumulate gas in the pipe to affect the heat exchange effect.

[0051] Preferably, the second pipe is a double-layer pipe, including an inner pipe 9 and an outer pipe 10 sleeved outside the inner pipe, with a gap between the inner pipe and the outer pipe.

[0052] Preferably, a second heat medium inlet 11 is provided at one end of the second pipe, a second heat medium outlet 12 is provided at the other end of the second pipe, and the second heat medium inlet, the second heat medium outlet and the gap between the inner pipe and the outer pipe are connected.

[0053] Preferably, the second heat medium inlet is located below the second pipe, and the second heat medium outlet is located above the second pipe.

[0054] In the above, the second heat medium inlet and the second heat medium outlet are respectively connected to the heat medium device. The heat medium flows in the gap between the inner pipe and the outer pipe. The heat medium in the heat medium device enters the second pipe from the bottom and exits from the top, ensuring that the heat medium can fully fill the pipe and does not accumulate gas in the pipe to affect the heat exchange effect.

[0055] Preferably, the first heat medium inlet and the second heat medium inlet are located on the same side of the spiral ribbon static mixer.

[0056] Preferably, the spiral belt is integrally formed with the first pipe, welded or detachably connected.

[0057] Preferably, the height of the spiral ribbon in each mixing unit is the same, which is the same as the height of the fluid channel.

[0058] Preferably, the length, quantity, thickness and material of the spiral ribbons in each mixing unit are the same or different.

[0059] Preferably, the thickness of the spiral tape is 0.01 to 5 mm.

[0060] Preferably, the thickness of the spiral belt is calculated based on the strength of the spiral belt material and the pressure drop requirements of the first pipeline and the second pipeline, and is more preferably 0.05 to 1 mm.

[0061] Preferably, the length of the spiral belt is adjusted according to the lengths of the first pipe and the second pipe.

[0062] Preferably, the rotation angle of the spiral channel in the mixing unit is 30°-60°.

[0063] Preferably, the rotation angles of the spiral channels in each mixing unit are the same or different, and the rotation angles are adjusted according to the pressure drop and mixing effect of the first pipeline and the second pipeline.

[0064] Example 2

[0065] This embodiment is carried out on the basis of the above embodiment, and the similarities with the above embodiment are not repeated here.

[0066] This example simulates the same high-viscosity fluid flowing through a hollow circular tube of the same size and the spiral ribbon static mixer used in Example 1 under the same heat exchange conditions. The fluid inlet temperature is 300K and the tube wall heating temperature is 360K.

[0067] Furthermore, the length of the hollow circular tube and the spiral ribbon static mixer used in Example 1 are both 3 m.

[0068] After mixing, the temperature of the fluid at the outlet of the hollow circular tube is 340K, and the temperature of the fluid at the outlet of the spiral ribbon static mixer is 353K. The temperature field of the spiral ribbon static mixer is more uniform, and the temperature gradient is smaller than that of the circular tube.

[0069] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spiral ribbon static mixer, characterized in that: It is used to fully mix the fluid for heat exchange and is connected to the heat medium device. It includes a first pipe and a second pipe sleeved outside the first pipe. The first pipe and the second pipe are both connected to the heat medium device. A fluid channel for fluid flow is provided between the first pipe and the second pipe; a plurality of mixing units are provided in the fluid channel, and each mixing unit is provided with a spiral channel composed of a plurality of spiral belts. The fluid is mixed in the spiral channel, and the spiral channels in adjacent mixing units rotate in opposite directions.

2. A spiral ribbon static mixer according to claim 1, characterized in that: The fluid channel is formed by the space between the first pipe and the second pipe.

3. A spiral ribbon static mixer according to claim 1, characterized in that: A first heat medium inlet is provided at one end of the first pipe, a first heat medium outlet is provided at the other end of the first pipe, and the inner pipe of the first pipe, the first heat medium inlet and the first heat medium outlet are in communication.

4. A spiral ribbon static mixer according to claim 3, characterized in that: The first heat medium inlet is located below the first pipe, and the first heat medium outlet is located above the first pipe.

5. A spiral ribbon static mixer according to claim 1, characterized in that: The second pipe is a double-layer pipe, including an inner pipe and an outer pipe sleeved outside the inner pipe, and there is a gap between the inner pipe and the outer pipe.

6. A spiral ribbon static mixer according to claim 5, characterized in that: A second heat medium inlet is provided at one end of the second pipe, a second heat medium outlet is provided at the other end of the second pipe, and the second heat medium inlet, the second heat medium outlet and the gap between the inner pipe and the outer pipe are connected.

7. A spiral ribbon static mixer according to claim 6, characterized in that: The second heat medium inlet is located below the second pipe, and the second heat medium outlet is located above the second pipe.

8. The spiral ribbon static mixer according to claim 1, characterized in that: The spiral belt is integrally formed with the first pipe, welded or detachably connected.

9. The spiral ribbon static mixer according to claim 1, characterized in that: The thickness of the spiral band is 0.01 to 5 mm.

10. The spiral ribbon static mixer according to claim 1, characterized in that: The rotation angle of the spiral channel in the mixing unit is 30°-60°.

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