CN108993187A - Pipeline static hybrid element and pipeline static mixer containing the hybrid element - Google Patents
Pipeline static hybrid element and pipeline static mixer containing the hybrid element Download PDFInfo
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- CN108993187A CN108993187A CN201811102143.8A CN201811102143A CN108993187A CN 108993187 A CN108993187 A CN 108993187A CN 201811102143 A CN201811102143 A CN 201811102143A CN 108993187 A CN108993187 A CN 108993187A
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- 230000003068 static effect Effects 0.000 title claims abstract description 65
- 239000012530 fluid Substances 0.000 claims abstract description 93
- 238000002156 mixing Methods 0.000 claims description 68
- 230000004323 axial length Effects 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000011109 contamination Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 6
- 230000008602 contraction Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000003889 chemical engineering Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012847 fine chemical Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000003756 stirring Methods 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/43195—Wires or coils
- B01F25/431951—Spirally-shaped baffle
- B01F25/431952—Conical or pyramidal elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
- B01F25/431972—Mounted on an axial support member, e.g. a rod or bar
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pipe Accessories (AREA)
Abstract
The invention belongs to pipeline static mixer technologies, more particularly to a kind of pipeline static hybrid element, it include: first element, at least one set of second element and third element, first element, second element and third element are sequentially connected and three's axis is overlapped, first element includes circular conical surface, and the first cylindrical surface at circular conical surface maximum gauge；Second element includes the first round table surface, and the second cylindrical surface at the first round table surface maximum gauge；It is connected at first round table surface minimum diameter at first cylindrical surface；Third element is the second round table surface, is connected at the maximum gauge of the second round table surface with the second cylindrical surface.The invention also discloses a kind of pipeline static mixers.Pipeline static hybrid element disclosed in this invention, its circular conical surface has rectified action to fluid, generate after circular conical surface strong turbulent convection body with immixture, resistance is small, the pressure loss is small, without sharp-edged abrasion, without technical characterstics such as dead angle, non-contaminations.
Description
Technical Field
The invention belongs to the technology of pipeline static mixers, and particularly relates to a pipeline static mixing element and a pipeline static mixer containing the same.
Background
The static mixer of the pipeline is a high-efficiency mixing device consisting of mixing elements with different specifications and arranged in a hollow pipeline, is an advanced unit device, and is different from a stirrer in that the static mixer has no moving parts and only has static elements. When the fluid flows through the static mixer, the fluid rotates leftwards and rightwards due to the action of the mixing unit, the flowing direction is changed continuously, the central fluid flow is pushed to the periphery, and the peripheral fluid is pushed to the center to generate shunting, converging and rotating, so that the fluid is fully mixed.
Laminar flow is "split-position move-rejoin"; in turbulent flow, besides the three conditions, the fluid can generate violent vortex in the cross section direction, and strong shearing force acts on the fluid, so that the fluid is further divided and mixed, and finally mixed to form the required mixed solution.
The main types of static mixers commonly used in the market at present are SV, SH, SK, SX and SL types. Wherein,
the SV type static mixer internal unit is assembled by corrugated sheets and is suitable for low-viscosity or a small amount of non-caking impurities;
the SH-type static mixer unit consists of double channels, spiral sheets are placed in the channels, the positions of the double channels of adjacent units are staggered by 90 degrees, and a fluid redistribution chamber is arranged between the units, is suitable for the condition that the viscosity is less than or equal to 104Centipoise middle and high viscosity liquid-liquid reaction, mixing and absorption process or polymer fluid mixing and reaction process;
the SK type static mixer is also called single-spiral static mixer, its unit is a spiral plate twisted by 180 deg. or 270 deg., when it is installed in the pipe shell, the adjacent spiral plates are respectively left-handed and right-handed, and it is applicable to small flow rate accompanied by impurity or viscosity less than 106A centipoise high viscosity medium;
the SX type static mixer unit is a plurality of X type units formed by crossed horizontal bars according to a certain rule, and is suitable for mixing and reacting generated high polymer fluid;
the SL-type static mixer unit is a single X-shaped unit formed by crossed horizontal bars according to a certain rule and suitable for the condition that the viscosity is less than or equal to 108Centipoise or with mixing of high polymer media;
however, the common defects of these pipeline static mixers include complicated fluid passages, easy fouling, large fluid resistance, single adaptability of fluid and the like.
Disclosure of Invention
The object of the present invention is to provide a static mixer element for pipes and a static mixer for pipes comprising such a mixer element, which solves one or several of the above mentioned problems.
According to one aspect of the present invention, there is provided a pipe static mixing element comprising: first component, at least a set of second component and third component, first component, second component and third component connect gradually and the coincidence of three axis, wherein:
the first element comprises a conical surface and a first cylindrical surface arranged at the maximum diameter position of the conical surface;
the second element comprises a first circular table surface and a second cylindrical surface arranged at the maximum diameter position of the first circular table surface; the position of the first circular table surface with the minimum diameter is connected with the position of the first cylindrical surface;
the third element is a second circular table surface, and the maximum diameter position of the second circular table surface is connected with the second cylindrical surface.
Therefore, the V-shaped conical surface at the front end of the static mixing element of the pipeline has a rectification effect on the fluid, and the fluid generates strong turbulence after passing through the first cylindrical surface, so that the fluid is mixed; and the static mixing element of the pipeline integrally adopts the structural design of conical surface-cylindrical surface-conical surface, and has the characteristics of small resistance, small pressure loss, no sharp edge abrasion, no dead angle and no pollution accumulation.
in some embodiments, the cone angle of the conical surface is 40-45 degrees, and the diameter of the first cylindrical surface is determined according to the equivalent diameter ratio β of 0.5-0.55, so that the cone angle of the conical surface adopts a streamline design of 40-45 degrees, the cone angle has the function of adjusting the flow of the fluid and is beneficial to reducing the resistance of the fluid, when the cone angle of the conical surface is less than 40 degrees, the axial length of the conical surface is increased so as to increase the cost, and if the cone angle is more than 45 degrees, the fluid resistance is increased, and the first cylindrical surface is directly arranged behind the conical surface, so that the fluid is prevented from suddenly contracting, the fluid smoothly flows through the first cylindrical surface under the action of the rotating flow, and the accumulation of solid particles in the fluid and liquid drops in the gas is avoided.
in some embodiments, the first circular table has a cone angle of 40 ° to 45 °, a minimum diameter determined by an equivalent diameter ratio β of 0.8 to 0.85, and the second cylindrical surface has a diameter determined by an equivalent diameter ratio β of 0.5 to 0.55, and an axial length of 0.2 to 0.3 times an inner diameter of the pipe, so that the second member is configured to provide a space for rapidly releasing energy for a fluid flowing through the first cylindrical surface and the second cylindrical surface, so that kinetic energy of the fluid is rapidly released, and at the same time, a fluid state generating strong turbulence is rapidly transformed, and the turbulence also effectively mixes the fluid, and when the cone angle of the first circular table is less than 40 °, the axial length is increased, and when the cone angle is greater than 45 °, the fluid resistance is increased.
wherein the equivalent diameter ratio β is defined as follows:
in the formula: d is the inner diameter of the pipeline under the working condition; d is the diameter of the V-shaped conical surface at the maximum cross section.
In some embodiments, the second truncated cone angle is 110 ° to 120 °. Therefore, when the fluid passes through the section, stronger vortex flow can be generated, and a strong mixing effect is generated, so that the fluid is mixed more fully and flows to the subsequent flow; when the taper angle of the second circular table top is larger than 120 degrees, the larger the taper angle is, the smaller the outflow coefficient is; when the second truncated cone angle is less than 110 °, the axial length thereof is increased, thereby increasing the cost.
In some embodiments, the conical surface maximum diameter is equal to the first cylindrical surface diameter; the minimum diameter of the first circular table surface is smaller than the diameter of the first cylindrical surface; the maximum diameter of the first circular table surface is equal to the diameter of the second cylindrical surface; the maximum diameter of the second circular table surface is equal to the second cylindrical surface. Therefore, an annular space is formed at the joint between the first circular table surface and the first cylindrical surface, and the fluid state transformation and the energy release in the annular space after flowing through the first cylindrical surface are facilitated; when the fluid flows to the second circular truncated cone surface from the second cylindrical surface, the diameter of the second circular truncated cone surface is gradually reduced in the axial direction, so that a diffusion section is formed at the position, and the fluid is pushed and pressed from the pipe wall to the pipe shaft, so that vortex flow is conveniently formed to enable the fluid to be mixed again.
The invention discloses a static mixing element for a pipeline, which adopts a V-cone contraction structure. The cone contraction structure has a special fluid rectification structure, can directly rectify fluid with irregular flow velocity into ideal fluid, and utilizes the flow regulation of the cone contraction section and the flow equalizing effect of asymmetric velocity distribution at the front section of the mixing element, namely, the contraction section is formed to push and press the fluid from the pipe shaft to the surrounding pipe wall to forcedly shunt the fluid so as to achieve the rectification purpose.
The static mixing element of the pipeline disclosed by the invention has wide application, can be applied to most static mixing occasions of a fluid conveying pipeline, and can select different structural parameters to achieve the optimal mixing effect when being applied to different occasions.
According to another aspect of the present invention, there is provided a static mixer for a pipe, comprising a pipe, a mixing element, and a support body for supporting the mixing element, the mixing element coinciding with an axis of the pipe, wherein the mixing element comprises a first element, at least one set of second elements, and a third element, the first element, the second element, and the third element being connected in series with their axes coinciding,
the first element comprises a conical surface and a first cylindrical surface arranged at the maximum diameter position of the conical surface;
the second element comprises a first circular table surface and a second cylindrical surface arranged at the maximum diameter position of the first circular table surface; the position of the first circular table surface with the minimum diameter is connected with the position of the first cylindrical surface;
the third element is a second circular table surface, and the maximum diameter position of the second circular table surface is connected with the second cylindrical surface.
In some embodiments, the conical surface has a cone angle of 40 ° to 45 °, and the diameter d of the first cylindrical surface1the equivalent diameter ratio beta of the conical surface is 0.5-0.55, wherein d1The calculation method is as follows:
in the formula, D is the inner diameter of the pipeline;
the axial length of the first cylindrical surface is 0.2-0.3 times of the inner diameter of the pipeline, therefore, the diameter of the first cylindrical surface is determined according to the equivalent diameter ratio β of the conical surface being 0.5-0.55, the channel sectional area of the corresponding annular gap is 25% -30% of the channel sectional area of the used pipeline, the axial length of the annular gap is 0.2-0.3 times of the inner diameter of the pipeline, the annular overflow gap has a good flow regulation function, and meanwhile, the annular overflow gap has the functions of uniform speed distribution and energy accumulation and is very helpful for subsequent energy release.
In some embodiments, the first circular table has a cone angle of 40 ° to 45 °, an axial length of 0.4 to 0.5 times the inner diameter of the pipe, and a minimum diameter d2the equivalent diameter ratio beta of the conical surface β is 0.8-0.85, wherein d2The calculation method is as follows:
in the formula, D is the inner diameter of the pipeline;
diameter d of the second cylindrical surface3the equivalent diameter ratio beta of the conical surface is β -0.55, wherein d3The calculation method is as follows:
in the formula, D is the inner diameter of the pipeline;
the axial length of the second cylindrical surface is 0.2-0.3 times of the inner diameter of the pipeline. Therefore, the structural design of the second element provides a space for rapidly releasing energy for the fluid flowing through the first cylindrical surface and the second cylindrical surface, so that the kinetic energy of the fluid is rapidly released; at the same time, the fluid state is rapidly converted when strong turbulence is generated, and the turbulence is also effective for mixing the fluid.
In some embodiments, the second circular mesa has a cone angle of 110 ° to 120 ° at the last segment of the mixing element. Therefore, when the fluid passes through the section, stronger vortex flow is generated, and strong mixing action is generated, so that the fluid is mixed more fully and flows to the subsequent flow.
In some embodiments, the conical surface has a maximum diameter equal to the diameter of the first cylindrical surface, the first circular truncated surface has a minimum diameter less than the diameter of the first cylindrical surface, the first circular truncated surface has a maximum diameter equal to the diameter of the second cylindrical surface, and the second circular truncated surface has a maximum diameter equal to the diameter of the second cylindrical surface. Therefore, a space is formed at the joint of the first cylindrical surface and the first circular table top, and the fluid state transformation and energy release in the space after flowing through the first cylindrical surface are facilitated; moreover, the structural design also enables an annular overflowing gap to be formed between the mixing element and the inner wall of the pipeline, and the annular overflowing gap has a good flow adjusting function on fluid.
In some embodiments, the support body is an adjustable mechanism with a lock, and at least two groups are provided and are arranged on the mixing element in a mutually crossed manner; when the second element is provided with two groups, the support bodies are arranged at two ends of the mixing element in a cross way; when the second component is provided with more than five groups, in addition to the mixed component both ends set up the supporter, still can set up the supporter at second component interlude according to actual demand. Thereby, by adjusting the support body, the coaxiality of the mixing element and the pipe can be ensured.
After fluid flows into the pipe from the pipe orifice, when the fluid flows through the pipeline static mixing element with the conical surface structure, the flow state of the fluid is changed multiply: the excessive flow-laminar flow-turbulent flow, namely frequent contraction and diffusion are alternately carried out, so that large-scale strong vortex flow exists in the fluid in the pipe after the fluid flows through the conical surface structure, two or more strands of fluid are cut, sheared, rotated and remixed, and the full mixing effect is achieved through the strong radial circulation mixing action.
The pipeline static mixing element provided by the invention adopts a streamline design combined with reasonable application of a conical surface, has small resistance of fluid, small pressure loss, good structural manufacturability, wide Reynolds number range of the fluid, sufficient radial mixing of the fluid and no flow blind area, so that the problem of 'dirt accumulation' of materials does not exist; in addition, the mixing element of the invention has simple structure and long service life.
The pipeline static mixer provided by the invention adopts the mixing element, forms the annular fluid channel with the cycle of contraction-diffusion-contraction-diffusion in the mixer, has simple structure and good self-mixing effect, can replace a mechanical stirred tank reactor as a continuous reactor for quick reaction without generation of self-polymerization, and has simple structure, easy precision manufacturing, low processing cost and convenient field installation; in addition, the static mixer of the pipeline can meet the application range of SH type and SV type static mixers in static mixing setting HG/T20570.20-95. In the rapid reaction process of fine chemical engineering, the reactor can be used as a plug flow tubular reactor to replace a fully mixed flow stirring type reactor; in the sewage treatment engineering, the device is suitable for the mixing occasion of fluid after adding medicine in the pipeline transportation.
Drawings
FIG. 1 is a schematic structural view of a static mixing element of a pipeline according to an embodiment of the present invention;
FIG. 2 is a schematic angle view of the static mixing element of the pipe of FIG. 1;
FIG. 3 is a schematic view of the junction area of the static mixing element of the pipe of FIG. 1;
FIG. 4 is a schematic diagram of a static mixer in a pipeline according to an embodiment of the present invention;
FIG. 5 is a graph of the flow pattern and the change in cross-sectional area of the passage of fluid through the static mixer mixing element of the pipeline shown in FIG. 4;
FIG. 6 is a graph of the change in stream flow pattern and flow rate magnification of a fluid passing through the in-line static mixer mixing element of FIG. 4;
FIG. 7 is a schematic structural diagram of a static mixer in pipeline according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
FIGS. 1-2 schematically illustrate a static mixing element of a pipe according to one embodiment of the invention. As shown, the device is integrally formed, has a unitary structure without movable parts, and comprises: a set of first component 1, three sets of second component 2 and a set of third component 3, first component 1, second component 2 and third component 3 connect gradually and the three axis coincidence.
The first element 1 comprises a conical surface 11 and a first cylindrical surface 12 arranged at the maximum diameter of the conical surface 11, wherein the cone angle delta of the conical surface 11 is 45 DEG and the diameter d of the first cylindrical surface1determined by equivalent diameter ratio β of 0.55, i.e. d1＝0.84D。
The second element 2 comprises a first circular table surface 21 and a second cylindrical surface 22 arranged at the maximum diameter of the first circular table surface 21; the first circular table surface 22 is in a circular table shape, and the minimum diameter position of the first circular table surface is connected with the first cylindrical surface 12; wherein, the first round table surface d2has a cone angle theta of 45 DEG, the minimum diameter of which is determined by the equivalent diameter ratio β being 0.8, i.e. d20.6D; second cylindrical surface d3is determined by the equivalent diameter ratio β being 0.55, i.e. d3＝0.84D。
The third element 3 is a second circular table surface 31, the second circular table surface 31 is also in a circular table shape, the maximum diameter position of the second circular table surface 31 is connected with the second cylindrical surface 22, and the taper angle lambda of the second circular table surface is 120 degrees.
Wherein, the maximum diameter of the conical surface 11 is equal to the diameter of the first cylindrical surface 12, and the maximum diameter of the conical surface 11 is connected with the first cylindrical surface 12, and the two are integrally connected; the minimum diameter of the first circular table surface 21 is smaller than that of the first cylindrical surface 12, and the first cylindrical surface 12 is connected with the minimum diameter of the first circular table surface 21, so that a joint part is also arranged between the first circular table surface and the first cylindrical surface, and the first circular table surface, the first cylindrical surface and the first circular table surface are integrally connected; the maximum diameter of the first circular table surface 21 is equal to the diameter of the second cylindrical surface 22, and the maximum diameter of the first circular table surface 21 is connected with the second cylindrical surface 22, and the two are integrally connected; the maximum diameter of the second circular table surface 31 is equal to the diameter of the second cylindrical surface 22, the diameter of the second cylindrical surface 22 is connected with the second circular table surface 31, the two are integrally connected, a sharp edge is formed at the tail end of the mixing element, and fluid can be mixed again after flowing through the mixing element, so that the fluid is mixed more fully and uniformly before discharging.
At the same time, an annular space 4 for the fluid to rapidly release energy is formed between the first cylindrical surface 12 and the first circular table surface 21, and strong flow break is generated in the annular space 4, so that the fluid is effectively mixed.
The junction areas of the hybrid elements (as shown by the dashed circles in fig. 3, wherein only one group of the first element, the second element and the third element is shown in fig. 3) are all designed in a rounded streamline manner, and particularly, the design that the right angle is replaced by the radian at the junction of the first cylindrical surface 12 and the first circular table surface 21 can also effectively prevent dirt accumulation.
In other embodiments, the second elements may also be set as 1 group, 2 groups or 4 groups, 5 groups or more, and may be increased or decreased according to the actual situation.
Fig. 4 schematically shows a pipe static mixer according to another embodiment of the invention, wherein the direction of the arrows indicates the direction of fluid flow. As shown in the figure, the device comprises a hollow pipe 6, a mixing element 7 arranged in the hollow pipe 6, a support body 8 for supporting the mixing element 7 and a standard flange 9 for connecting with an on-site process pipe, wherein the support body 8 is an adjustable mechanism with a lock, and two support bodies are arranged at two ends of the mixing element 7 in a criss-cross manner; the arrows indicate the direction of flow of the fluid.
The axis of the mixing element 7 coincides with the axis of the duct 6, wherein the mixing element 7 is schematically shown in fig. 1 and 2 and comprises: a set of first component 1, three sets of second component 2 and a set of third component 3, first component 1, second component 2 and third component 3 connect gradually and the three axis coincidence.
The first element 1 comprises a conical surface 11 and a first cylindrical surface 12 arranged at the maximum diameter of the conical surface 11, wherein the cone angle delta of the conical surface 11 is 45 DEG and the diameter d of the first cylindrical surface 121determined by the equivalent diameter ratio β being 0.55, i.e. d1The axial length of the first cylindrical surface 12 is 0.2 times the inner diameter of the pipe 6, which is 0.84D.
The second element 2 comprises a first circular table surface 21 and a second cylindrical surface 22 arranged at the maximum diameter of the first circular table surface 21; the first circular table surface 22 is in a circular table shape, and the minimum diameter position of the first circular table surface is connected with the first cylindrical surface 12; wherein the taper angle theta of the first circular table surface is 45 DEG, and the minimum diameter d thereof2determined by the equivalent diameter ratio β being 0.8, i.e. d20.6D, the axial length of which is 0.4 times the inner diameter of the pipe 6; second cylindrical surface d3is determined by the equivalent diameter ratio β being 0.55, i.e. d30.84D, the axial length of which is 0.2 times the inner diameter of the pipe 6.
The third element 3 is a second circular truncated cone 31, the second circular truncated cone 31 is also in the shape of a circular truncated cone, the maximum diameter of the second circular truncated cone 31 is connected with the second cylindrical surface 22, and the taper angle lambda of the second circular truncated cone 31 is 120 degrees.
Wherein, the maximum diameter of the conical surface 11 is equal to the diameter of the first cylindrical surface 12, and the two are integrally connected; the minimum diameter of the first circular table surface 21 is smaller than that of the first cylindrical surface 12, and a joint part is arranged between the first circular table surface and the first cylindrical surface, and the first circular table surface, the first cylindrical surface and the second cylindrical surface are integrally connected; the maximum diameter of the first circular table surface 21 is equal to the diameter of the second cylindrical surface 22, and the two are integrally connected; the maximum diameter of the second circular land 31 is equal to the diameter of the second cylindrical surface 22.
At the same time, an annular space 4 for the fluid to rapidly release energy is formed between the first cylindrical surface 12 and the first circular table surface 21, and strong flow break is generated in the annular space 4, so that the fluid is effectively mixed.
Meanwhile, an annular flow-through gap 10 is formed between the first cylindrical surface 12 and the three second cylindrical surfaces 22 and the inner wall of the tube body 6, and the annular flow-through gap 10 has a good flow regulation function on fluid.
The junction areas of the hybrid elements (as shown by the dashed circles in fig. 3, wherein only one group of the first element, the second element and the third element is shown in fig. 3) are all designed in a rounded streamline manner, and particularly, the junction of the first cylindrical surface 12 and the first circular table surface 21 is designed in a radian manner instead of a right angle manner, so that dirt accumulation can be effectively prevented.
When fluid flows through the pipe orifice in the pipe cavity, the fluid flow state, the channel sectional area and the flow rate change are as shown in fig. 5 and fig. 6, when the fluid flows through the first element, the channel sectional area is gradually reduced, the flow rate of the fluid is gradually increased, the fluid is pushed and pressed from the pipe axis to the surrounding pipe wall to forcedly split the flow, at the moment, the fluid with lower speed flows close to the inner wall of the pipe body and the fluid with higher speed flows close to the pipe axis to form mixed flow, so that the original larger speed distribution gradient is gradually reduced, and the asymmetrical speed distribution such as bias flow, rotational flow and the like is corrected, so that the fluid with uniformly distributed speed (namely laminar flow) is formed at a first annular flow passing gap formed by the first cylindrical surface and the inner wall of the pipe body;
then the fluid flows from the first cylindrical surface to the first circular table surface, as the minimum diameter part of the first circular table surface is connected with the first cylindrical surface and the minimum diameter of the first circular table surface is smaller than the diameter of the first cylindrical surface, a diffusion section is formed at the position, and the fluid is pushed and pressed from the pipe wall to the pipe shaft at the diffusion section and forms a large-scale strong vortex flow; and then, the fluid continuously moves forwards along the conical surface, the cross section of the channel through which the fluid flows is gradually reduced again, laminar flow is formed at the second cylindrical surface again, the steps are repeated until the fluid flows through the second conical surface, a diffusion section is formed again at the position, the fluid is pushed and pressed from the pipe wall to the pipe shaft, and forms vortex flow to be mixed again and then flows out of the pipe body.
In the entire process, the fluid flow state undergoes a change in flow state of transition flow → laminar flow → turbulent flow → laminar flow → turbulent flow → laminar flow → discontinuous flow, so that the fluid can be sufficiently mixed.
When the method is concretely implemented, firstly, the physical properties (such as viscosity, flow rate, working temperature, pressure and the like) and mixing requirements and operating conditions of a required mixed fluid are known, structural parameters of a mixing element are adjusted through professional calculation, manufacturing materials of the mixing element are selected according to the engineering design of a using unit, then the number of sections of a mixer, the field installation position and the installation form are determined according to the relevant process requirements of the using unit, the mixing element is manufactured in an oriented mode, and finally, the qualified pipeline static mixer is assembled; if desired, multiple inline static mixers (as shown in FIG. 4) may be used in series to facilitate processing and transportation while achieving the desired mixing results. The inline static mixer is installed in the process line as close as possible to the point of initial distribution of the two or more streams. Except for special notes, both ends of the equipment can be used as an inlet and an outlet.
In other embodiments, the second elements 2 may be arranged in one, two or four groups, five groups or more, which may be increased or decreased according to the actual length of the pipe body. When five or more groups of the second element 2 are provided, a support body 8 is additionally arranged at a proper position in the middle of the second element 2. As shown in fig. 7, in the pipe static mixer, five sets of the second element 2 and three sets of the support bodies 8 are provided, and the support bodies 8 are respectively disposed at both ends of the mixing element 7 and at the middle section of the second element 2.
in other embodiments, the taper angle δ of the conical surface 11 is 40 ° or 42 ° or 43 ° or 44 °, and the diameter of the first cylindrical surface 12 is determined according to the equivalent diameter ratio β of the conical surface being 0.5 or 0.52 or 0.53 or 0.54, and the axial length thereof may also be 0.3 or 0.27 or 0.25 or 0.23 or 0.21 times the inner diameter of the conduit 6.
In other embodiments, the taper angle θ of the first circular mesa 21 is 40 ° or 42 ° or 43 ° or 44 °, with its smallest diameter d2can be determined according to the equivalent diameter ratio β of 0.81 or 0.84 or 0.83 or 0.82 or 0.85, the axial length of which is 0.45 or 0.42 or 0.48 or 0.46 times the inner diameter of the pipe 6, and the diameter d of the second cylindrical surface3the axial length thereof may also be 0.3 or 0.27 or 0.25 or 0.23 or 0.21 times the inner diameter of the pipe 6, determined by the equivalent diameter ratio β being 0.5 or 0.52 or 0.53 or 0.54.
In other embodiments, the taper angle λ of the second circular truncated surface 31 may also be 110 ° or 112 ° or 115 ° or 117 ° or 113 ° or 118 °.
In the rapid reaction process of fine chemical engineering, the pipeline static mixer can be used as a plug flow tubular reactor to replace a full mixed flow stirring type reactor, at the moment, the pipe body in the pipeline static mixer needs to meet the requirement that the length/the pipe diameter of the pipe is more than 50, reaction materials continuously enter from one end of the pipeline at a stable flow rate, flow while reacting while flowing through a mixing element, and finally, the reaction materials are discharged from the other end of the pipeline.
In the sewage treatment project, the pipeline static mixer is suitable for the mixing occasion in pipeline transportation after adding medicine to the fluid, namely adding sewage treatment agent to the fluid to be treated from the medicine feeding port on the pipeline, and the agent is mixed with the fluid and simultaneously acts on the fluid when flowing through the mixing element so as to achieve the purpose of medicine feeding; at this time, a method of serially connecting a plurality of pipeline static mixers can be adopted, so that the sewage treatment effect is better.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A pipeline static mixing element, comprising: the device comprises a first element (1), at least one group of second elements (2) and a third element (3), wherein the first element (1), the second elements (2) and the third element (3) are sequentially connected, and the central axes of the first element, the second element and the third element coincide, wherein:
the first element (1) comprises a conical surface (11) and a first cylindrical surface (12) arranged at the maximum diameter of the conical surface (11);
the second element (2) comprises a first circular table surface (21) and a second cylindrical surface (22) arranged at the maximum diameter of the first circular table surface (21); the position of the minimum diameter of the first circular table surface (21) is connected with the first cylindrical surface (12), and the minimum diameter of the first circular table surface (21) is smaller than the diameter of the first cylindrical surface (12);
the third element (3) is a second circular table surface (31), and the maximum diameter position of the second circular table surface (31) is connected with the second cylindrical surface (22).
2. static mixer element according to claim 1, characterised in that the conical surface (11) has a cone angle of 40 ° to 45 ° and the diameter of the first cylindrical surface (12) is determined by the equivalent diameter ratio β of 0.5 to 0.55.
3. the static mixer element of claim 2, characterised in that the cone angle of the first circular table (21) is between 40 ° and 45 °, the minimum diameter of which is defined by the equivalent diameter ratio β between 0.8 and 0.85, the diameter of the second cylindrical surface (22) is defined by the equivalent diameter ratio β between 0.5 and 0.55, and the cone angle of the second circular table (31) is between 110 ° and 120 °.
4. A static mixer element according to claim 3, characterised in that an annular space (4) for the rapid release of energy from the fluid is also formed between the first cylindrical surface (12) and the first circular table surface (21).
5. Static mixing element according to any of claims 1 to 4, characterised in that the maximum diameter of the conical surface (11) is equal to the diameter of the first cylindrical surface (12); the maximum diameter of the first circular table surface (21) is equal to the diameter of the second cylindrical surface (22); the maximum diameter of the second circular table surface (31) is equal to the second cylindrical surface (22).
6. Static mixer for pipes, characterized in that it comprises a pipe (6), a mixing element (7), and a support (8) for supporting the mixing element (7), the mixing element (7) coinciding with the axis of the pipe (6), wherein the mixing element (7) comprises a first element (1), at least one set of a second element (2) and a third element (3), the first element (1), the second element (2) and the third element (3) being connected in sequence with their central axes coinciding,
the first element (1) comprises a conical surface (11) and a first cylindrical surface (12) arranged at the maximum diameter of the conical surface (11);
the second element (2) comprises a first circular table surface (21) and a second cylindrical surface (22) arranged at the maximum diameter of the first circular table surface (21); the position of the minimum diameter of the first circular table surface (21) is connected with the position of the first cylindrical surface (12);
the third element (3) is a second circular table surface (31), and the position with the largest diameter of the second circular table surface (31) is connected with the surface of the second cylinder (22).
7. the static mixer according to claim 6, characterized in that the conical surface (11) has a cone angle of 40 ° to 45 °, the diameter of the first cylindrical surface (12) being determined by an equivalent diameter ratio β of 0.5 to 0.55, the axial length of which is 0.2 to 0.3 times the internal diameter of the pipe (6).
8. the static mixer according to claim 7, characterised in that said first circular table (21) has a cone angle of 40 ° to 45 °, a minimum diameter defined by an equivalent diameter ratio β of 0.8 to 0.85, and an axial length of 0.4 to 0.5 times the internal diameter of the pipe (6), said second cylindrical surface (22) has a diameter defined by an equivalent diameter ratio β of 0.5 to 0.55, and an axial length of 0.2 to 0.3 times the internal diameter of the pipe (6), and said second circular table (31) has a cone angle of 110 ° to 120 °.
9. The static mixer of claim 8, characterized in that said conical surface (11) has a maximum diameter equal to the diameter of the first cylindrical surface (12); the minimum diameter of the first circular table surface (21) is smaller than the diameter of the first cylindrical surface (12); the maximum diameter of the first circular table surface (21) is equal to the diameter of the second cylindrical surface (22); the maximum diameter of the second circular table surface (31) is equal to the second cylindrical surface (22).
10. Static mixer according to any of claims 6 to 9, characterised in that said support bodies (8) are adjustable mechanisms with locking, provided in at least two groups, arranged crosswise to each other on said mixing elements (7).
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| CN201811102143.8A CN108993187B (en) | 2018-09-20 | 2018-09-20 | Pipeline static mixing element and pipeline static mixer comprising same |
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| CN201811102143.8A CN108993187B (en) | 2018-09-20 | 2018-09-20 | Pipeline static mixing element and pipeline static mixer comprising same |
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| CN117504679A (en) * | 2024-01-08 | 2024-02-06 | 汉盛（上海）海洋装备技术股份有限公司 | Mixer for water treatment |
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