CN103657497A - Three-level mixing system used for liquid mixing - Google Patents
Three-level mixing system used for liquid mixing Download PDFInfo
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- CN103657497A CN103657497A CN201210315609.9A CN201210315609A CN103657497A CN 103657497 A CN103657497 A CN 103657497A CN 201210315609 A CN201210315609 A CN 201210315609A CN 103657497 A CN103657497 A CN 103657497A
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Abstract
The invention discloses a three-level mixing system used for liquid mixing. The three-level mixing system comprises a pump internally provided with a stirring impeller, a premixing device arranged in front of the pump along the flow direction of mixed liquid, and a post-mixing device arranged behind the pump along the flow direction of the mixed liquid. Through the three-level mixing design, the three-level mixing system disclosed by the invention can enable a polymer flocculant to be fast mixed evenly in solid-liquid two-phase flow. In addition, the three-level mixing system is simple in structure, convenient and practical.
Description
Technical field
The present invention relates to a kind of mixing arrangement, relate in particular to a kind of apparatus for combining liquids.
Background technology
In wastewater treatment process, the mud after pretreated waste liquid and secondary precipitation need to enter in suspension pond and add high polymer coagulant (PAM), carries out flocculation reaction.Flocculation is exactly waste water after fully mixing with flocculation medicament, then enters the process that flocculation basin flocculates.For removing the pollutant in waste water, need in water, add appropriate flocculant, after a series of mixing, flocculation process, form floccule body, thereby guarantee in follow-up precipitation process, to there is good separating effect.Flocculation process can resolve into two stages: the first stage is rapid mixing process; Second stage is flocculation reaction process slowly.Above two processes are not removed impurity particle in water, are to create necessary condition for precipitation, filtering technique.
When suspension liquid is a kind of solid-liquid two-phase flow, high polymer coagulant is difficult for being distributed in suspension liquid because viscosity is high.If flocculant is directly added in suspension pond, the flocculating effect that can weaken medicament causes the waste of medicament, and makes the follow-up settling property variation at concentration basin, finally causes sheet frame mud extraction moisture content to improve.In order to obtain best flocculating effect, must make flocculant solution mix in suspension liquid.
The hybrid technology of at present general medicament is mainly divided static mixing and is dynamically mixed two kinds of modes:
Dynamically mixing plant is mainly passed through in mixing, its whipping process is in tank diameter, to input mechanical energy by the rotation of blade, thereby make fluid obtain suitable flow location form, and in flow field, carry out momentum, the transmission of heat and quality or carry out the process of chemical reaction.Churned mechanically mixing pit is considered to the mixing apparatus that a kind of efficiency is high for a long time, and its current feature is to have the character of back-mixing.But mixing plant generally applies in less reactive tank, as very large in fruit suspension pond volume, single-point adds flocculant effect will be poor, and multi-point adding flocculant is also difficult to control dosage.
Static mixer is relative dynamic blender and proposing, it is the different structure by fluid circuit, be able to carry out the mixing of fluid in very wide reynolds number range, and there is no a fluid circuit structure of mechanical type movable member, in pipeline, place the member of this special, tactical rule, when the materials such as two or more fluids are constantly cut and turn to during by these members, make it to mix.This device can be arranged on suspension elevator pump outlet conduit place, but contains a large amount of mud in the medium that pump is carried, and its complicated pipeline structure is easy to make its inner obstruction.
In static mixer, also has a kind of jet flow mixing device.Fluidic device is comprised of a centre-driven nozzle and an annular suction passage, by pressure water source, drives, and suck medium and mix, but its centre-driven nozzle easily causes the obstruction of inducing fluid.
In addition, water treatment field also has waterpower flocculator.Present waterpower flocculation form is varied, have dividing plate reactor, Cyclonic reactor, waterpower clarifier, pulse clarifier, flap reactor, corrugated plating reactor, grid reaction device etc., it all exists fabrication and installation difficulty, easily obstruction, operation maintenance inconvenience, flocculating effect to be subject to the shortcomings such as impact of changes in flow rate.
Summary of the invention
The object of this invention is to provide a kind of three grades of hybrid systems of mixing for liquid, it should make high polymer coagulant rapid mixing in solid-liquid two-phase flow even, and it also should meet simple in structure, convenient and practical requirement in addition.
Mixed process is under forced flow effect, to pass through main diffusion, DIFFUSION IN TURBULENCE and molecular diffusion, finally reaches molecular level and evenly mixes.First the medicament just having added forms the vortex micelle of large scale, under turbulent flow stretching, shear action, maelstrom splits into the vortex compared with small scale, energy is delivered to little vortex from maelstrom, little vortex is to less vortex transmission, until small scale more, the finally effect because of viscous stress dissipates as heat.In this course, can hydraulics plays a decisive role to mixing, and therefore how to control hydraulics, how effectively to eliminate large scale vortex, increases the ratio of small vortex, namely how to increase particle collision frequency, be the key that improve mixing efficiency.
Flocculant with in the mixing of solid-liquid two-phase flow, have himself condition, the first mixes, the connection of closing flocculating agent molecule that makes solid particle have equal opportunity to live; It two is fast, once mix, must stop mixing, and keeps the even fluidised form of fluid, in order to avoid strand is useless, destroys, and affect subsequent sedimentation and reacts.
Based on foregoing invention principle, in order to reach object of the present invention, the invention provides a kind of three grades of hybrid systems of mixing for liquid, it comprises:
One pump, has an agitator arm in described pump;
One pre-mixing apparatus, its flow direction along mixing material is located at the place ahead of described pump;
One rear mixing arrangement, its flow direction along mixing material is located at the rear of described pump;
Wherein, described pre-mixing apparatus comprises:
The shell of one tubulose, the flow direction along mixing material, the inwall of this shell has one first straight section, a conical section and one second straight section being connected successively, the diameter of described the second straight section is less than the diameter of the first straight section, the groove on described the first straight section with an annular, on described shell, also offer a medicament inlet, this medicament inlet and described groove conducting;
The inner sleeve of one tubulose, it is located in described shell; Described inner sleeve has a first paragraph and a second segment, the external diameter of described first paragraph is greater than the external diameter of second segment, and first paragraph is closely fixedly connected with described shell, second segment and described groove form a medicament buffering area, the second segment of described inner sleeve also forms an annular gap with the first straight section of shell, and this annular gap is connected with described medicament buffering area and conducting;
Described rear mixing arrangement comprises:
One protecgulum, it has a cavity, and the front end of described protecgulum offers a upstream nozzle, and this upstream nozzle is communicated with the cavity of protecgulum;
The Impactor of one hollow, it has a link and a tapering point, and described link is connected with the rear end of protecgulum, so that described tapering point is all located in the cavity of protecgulum, described tapering point has a downstream nozzle, and described downstream nozzle and upstream nozzle coaxially or almost coaxially arrange;
The structure of described rear mixing arrangement is arranged with the axle center axial symmetry of upstream nozzle or downstream nozzle.
Further, in pre-mixing apparatus, the length L of the conical section of described shell
1=(0.5～1) D
2, D
2internal diameter for described inner sleeve.
Further, in described rear mixing arrangement, the concentricity of upstream nozzle and downstream nozzle is not more than 0.05mm.
Further, in pre-mixing apparatus, the diameter D of described the second straight section
3it is the inside diameter D of inner sleeve
21.2～1.5 times.
Further, in pre-mixing apparatus, the tapering α of the conical section of described shell is 18 degree.
Further, in rear mixing arrangement, the front end face of described Impactor tapering point is apart from the distance L of described protecgulum cavity bottom
2with the ratio of the bore of upstream nozzle be 2.4.
Further, in rear mixing arrangement, the tapering β of described tapering point is 90-120 degree.
Three grades of hybrid systems of mixing for liquid of the present invention, by the design of three grades of mixing, make it can make high polymer coagulant rapid mixing in solid-liquid two-phase flow even, and it is simple in structure, convenient and practical in addition.
Accompanying drawing explanation
Fig. 1 has shown the structure of three grades of hybrid systems of mixing for liquid of the present invention.
Fig. 2 is three grades of hybrid systems of mixing for liquid of the present invention structure charts of pre-mixing apparatus in one embodiment.
Fig. 3 is the fundamental diagram of three grades of hybrid system pre-mixing apparatus that mix for liquid of the present invention.
Fig. 4 is the structure chart of three grades of hybrid systems of mixing for liquid of the present invention rear mixing arrangement in one embodiment.
Fig. 5 is the fundamental diagram of mixing arrangement after three grades of hybrid systems of mixing for liquid of the present invention.
The specific embodiment
Below in conjunction with Figure of description and embodiment, technical solutions according to the invention are further explained to explanation.
As shown in Figure 1, three grades of hybrid systems in the present embodiment comprise: without stifled dredge pump 16, the stifled dredge pump 16 of this nothing stirs pressurization by impeller, and by the effect of impeller, liquid is along with transport motion is done in the rotation of impeller, liquid constantly flows out again from the impeller of rotation simultaneously, with respect to impeller motion, by this compound motion, flocculant and suspension liquid obtain high-intensity stirring, owing to being the common equipments in this area without stifled dredge pump 16, therefore the technical program no longer describes in detail to it.Three grades of hybrid systems, except the stifled dredge pump 16 of above-mentioned nothing, also comprise along the flow direction of mixing material and are located at the pre-mixing apparatus 15 without the upstream of stifled dredge pump 16, and be located at the rear mixing arrangement 17 without the downstream of stifled dredge pump 16.
Fig. 2 has shown the structure of the pre-mixing apparatus under a kind of embodiment.As shown in Figure 1, this pre-mixing apparatus comprises the shell 1 of tubulose and is located at the inner sleeve 2 in the shell 1 of tubulose.The inwall of its housing 1 has the diameter D of the first straight section 11, conical section 12 and the second straight section 13, the second straight sections 13 that are connected successively
3be less than the diameter D of the first straight section 11
1, on the first straight section 11, thering is the groove of an annular, this groove and inner sleeve 2 have formed medicament buffering area 3, also offer medicament inlet 4 on shell 1, this medicament inlet 4 and 3 conductings of medicament buffering area.Inner sleeve 2 is located in shell 1, inner sleeve has first paragraph 21 and second segment 22, the external diameter of first paragraph 21 is greater than the external diameter of second segment 22, and first paragraph 21 is threaded connection with shell 1, the second segment 22 of inner sleeve 2 also forms an annular gap 5 with the first straight section 11 of shell 1, and this annular gap 5 is connected with medicament buffering area 3 and conducting.The length L of conical section
1the mixed performance of pre-mixing apparatus is had to larger impact, and inventor finds L by lot of experiments
1get the D of 0.5～1 times
2, D
2internal diameter for inner sleeve 2.In addition, in order better to produce entrainmenting property, inventor designs the diameter D of the second straight section 13
3it is the inside diameter D of inner sleeve 2
21.2～1.5 times.
D in the present embodiment
1for 65mm, D
2for 40mm, D
3for 52mm, L
1for 30mm, α is 18 degree, and the width of annular gap 5 is 1mm.
Pre-mixing apparatus in the technical program has adopted jet current principle.Because the space in pipeline is limited, the jet of device belongs to Confined space jet.Fig. 3 has shown the operation principle of pre-mixing apparatus.As shown in Figure 3, Liu He district 31, jet core speed remains unchanged, and has stream core to exist.At skin, due to the impact on Gu Bi border, by flow type pump with injection, be subject to the shear action of Gu Bi, and jet and the exchange of energy, quality is also occurred due to the shear action of jet boundary layer between flow type pump with injection.At basic flow region 32, along with the aggravation of energy, mass exchange, jet boundary layer expands to rapidly wall, and stream core disappears, and the residue section Ci district of each parameter of flow field is substantially similar, and this district is the mobile fundamental region of Confined space jet.In recirculating zone 33, jet had entrainmented all by flow type pump with injection before expanding to Gu Bi, Gu separation can occur wall boundary layer, on flow direction, produced and refluxed.Attached by being separated to again at Guan Liuqu 34 inner boundary layers, after dot again, (without refluxing, produce and at jet, expand to after Gu Bi), jet approaches evenly with being mixed by flow type pump with injection, flow velocity reaches unanimity, in downstream, area far away presents the flow behavior of pipe stream completely, and the uniformity of mixing by this process flocculation is improved greatly.
Fig. 4 has shown the structure of the rear mixing arrangement under a kind of embodiment.As shown in Figure 4, this rear mixing arrangement comprises: protecgulum 6, and it has a cavity, and the front end of protecgulum offers upstream nozzle 61, and upstream nozzle 61 is communicated with the cavity of protecgulum 6; The Impactor 7 of hollow, it has link and tapering point, and link is connected with the rear end of protecgulum 6, and so that tapering point is all located in the cavity of protecgulum 6, tapering point offers downstream nozzle 71, and downstream nozzle 71 and upstream nozzle 61 coaxially arrange; The structure of whole rear mixing arrangement is arranged with the axle center axial symmetry of upstream nozzle or downstream nozzle.In rear mixing arrangement, the front end face of Impactor 7 tapering points is apart from the distance L of protecgulum 6 cavity bottoms
2generation to self-oscillation whirlpool has material impact, in order to produce the self-oscillation effect of larger amplification, requires L in the technical program
2bore D with upstream nozzle 61
4ratio be 2.4.Meanwhile, in the present embodiment, the tapering β of tapering point is 110 degree.
In the present embodiment, the bore D of upstream nozzle 61
4=65mm, L
2=156mm, the bore D of downstream nozzle 71
6meet D
6/ D
4=1.2, so D
6=78mm, the inside diameter D of protecgulum cavity
5meet D
5/ D
4between=2～10, easy in order to process, D in the present embodiment
5=130mm.
The concentricity that it is emphasized that upstream nozzle 61 and downstream nozzle 71 is extremely important for the work of rear mixing arrangement, and the concentricity of the technical program middle and upper reaches nozzle 61 and downstream nozzle 71 is not more than 0.05mm.
Rear mixing arrangement in the technical program has adopted the self-oscillation principle of fluid.Self-oscillation, is exactly under must not extrinsic motivated condition, utilize fluid this in suitable fluidic structures by producing spontaneous vibration under special boundary condition.Self-oscillation, by produce certain whirlpool in pipeline, then improves the collision frequency of particle in hybrid reaction by the whirlpool in pipeline, improve mixing efficiency.Fig. 5 has shown the operation principle of above-mentioned rear mixing arrangement.As shown in Figure 5, when one high-pressure spray flows into axial symmetry chamber, in resonator, be full of stationary fluid, high-pressure spray and the Turbulent Mixing of stationary fluid generation around, produce strong momentum-exchange, form along the turbulent shear layer that flows to progressive additive, because high-pressure spray speed is large, shear layer is burble shear layer and is unsettled, produces vortex therefore shear layer fluid is around carried secretly, because shear layer is axisymmetric, therefore vortex exists and moves with the form symmetry of collar vortex 38.It near the intersection of shear layer and inactive liquid, is Disengagement zone 35, flowing distributes from boundary layer turns to shear layer to distribute, in shear layer, there is the very large and unsettled region of velocity gradient, orderly macrostructure vortex will be induced, vorticity disturbance in high-pressure spray within the scope of certain frequency is amplified, in shear layer, form a succession of discrete collar vortex 38, because shear layer is axisymmetric, the collar vortex 38 therefore forming is also symmetrical along chamber axle center.When it moves downstream, with downstream impact walls 36, bump, in impact zone, produce certain pressure disturbance ripple, this pressure disturbance ripple is upstream propagated with SVEL, arrive near initially-separate district, upstream, and the disturbance of 35 pairs of Disengagement zone is quite responsive, can bring out again new vorticity pulsation, because shear layer unstability has optionally amplification to disturbance, when the vorticity pulsation of mixed turbulent carried as side-arm stream propagates down stream meets its amplification condition in shear layer, this disturbance is just amplified in shear layer.Disturbance after amplification bumps with impact walls again, constantly repeats again said process.In this self-oscillation process, the endocorpuscular collision frequency of fluid has obtained significant increase, has improved mixing efficiency.
Please continue to refer to Fig. 1, three grades of hybrid systems in the present embodiment are when operation, and the compressed air in gas bag 10 is by pressure-reducing valve 11 pressure regulation rear drive membrane pump 12 actions, thereby the flocculant in conveying storage tank 13 is to pre-mixing apparatus 15.Without stifled dredge pump 16, the suspension liquid in suspension pond 14 is smoked, at pre-mixing apparatus 15 places, mix with flocculant generation one-level; Enter without after stifled dredge pump 16, high strength secondary occurs and mix; Finally, after 17 3 grades of mixing of mixing arrangement later, by pipeline, be delivered to subsequent treatment system.
Please continue to refer to Fig. 1 and Fig. 2, first order mixed process is mainly to utilize waterpower that flocculant is diffused in added current fast.First flocculant enters in the medicament buffering area 3 of pre-mixing apparatus 15, then by annular gap 5, enter mixed zone C, with the suspension generation recirculate mixing entering from suction area A, because the volume of annular gap 5 is very narrow and small, and the volume of medicament buffering area 3 is larger, make flocculant be subject to throttling action when through this two regions, pressure decreases, slowed down the pulse of membrane pump, guaranteed that stable pressure is delivered to without stifled dredge pump 16 entrances.The circular nature of annular gap 5 makes flocculant and the pipeline internal medium more can even contact, and its angle is parallel with pipeline, can not produce resistance to the liquid sucking without stifled dredge pump 16, effectively slow down the cavitation phenomenons without stifled dredge pump 16.Flocculant and suspension liquid cross at C place, mixed zone, and the exchange of energy, quality occurs under the shear action in boundary layer, due to the existence of α angle, produce and entrainment backflow.Enter after Guan Liuqu B, two kinds of fluids mixing approach evenly, and flow velocity reaches unanimity, and reveal the flow behavior of pipe stream completely, the vortex micelle of formation large scale.
Please continue to refer to Fig. 1, second level mixed process is a kind of high-intensity mechanical agitation process.By nothing, block up the stirring action of the impeller convection cell of dredge pump 16, first the medicament just having added forms the vortex micelle of large scale, and under stretching, shear action, maelstrom splits into the vortex compared with small scale, energy is delivered to little vortex from maelstrom, has the character of back-mixing.
Please continue to refer to Fig. 1 and Fig. 4, it is a kind of static mixing that the third level mixes, it utilizes fluid self-oscillation principle, fluid is in self-oscillation district D and Impactor 7 collisions, produce violent eddy current, in very strong shearing force, act under fluid, the fine part that makes fluid is further divided and mix.Meanwhile, the mobile of fluid meets with obstruction, and stablized the even fluidised form of fluid.
After above-mentioned three grades of mixing, flocculant and suspension mix, for good condition is created in subsequent sedimentation reaction.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above specific embodiment, have many similar variation and distortion thereupon.If all distortion and variation that those skilled in the art directly derives or associates from content disclosed by the invention, all should belong to protection scope of the present invention.
Claims (7)
1. three grades of hybrid systems of mixing for liquid, is characterized in that, comprising:
One pump, has an agitator arm in described pump;
One pre-mixing apparatus, its flow direction along mixing material is located at the place ahead of described pump;
One rear mixing arrangement, its flow direction along mixing material is located at the rear of described pump;
Wherein, described pre-mixing apparatus comprises:
The shell of one tubulose, the flow direction along mixing material, the inwall of this shell has one first straight section, a conical section and one second straight section being connected successively, the diameter of described the second straight section is less than the diameter of the first straight section, the groove on described the first straight section with an annular, on described shell, also offer a medicament inlet, this medicament inlet and described groove conducting;
The inner sleeve of one tubulose, it is located in described shell; Described inner sleeve has a first paragraph and a second segment, the external diameter of described first paragraph is greater than the external diameter of second segment, and first paragraph is closely fixedly connected with described shell, second segment and described groove form a medicament buffering area, the second segment of described inner sleeve also forms an annular gap with the first straight section of shell, and this annular gap is connected with described medicament buffering area and conducting;
Described rear mixing arrangement comprises:
One protecgulum, it has a cavity, and the front end of described protecgulum offers a upstream nozzle, and this upstream nozzle is communicated with the cavity of protecgulum;
The Impactor of one hollow, it has a link and a tapering point, and described link is connected with the rear end of protecgulum, so that described tapering point is all located in the cavity of protecgulum, described tapering point has a downstream nozzle, and described downstream nozzle and upstream nozzle coaxially or almost coaxially arrange;
The structure of described rear mixing arrangement is arranged with the axle center axial symmetry of upstream nozzle or downstream nozzle.
2. three grades of hybrid systems as claimed in claim 1, is characterized in that, in pre-mixing apparatus, and the length L of the conical section of described shell
1=(0.5～1) D
2, D
2internal diameter for described inner sleeve.
3. three grades of hybrid systems as claimed in claim 1 or 2, is characterized in that, in described rear mixing arrangement, the concentricity of upstream nozzle and downstream nozzle is not more than 0.05mm.
4. three grades of hybrid systems as claimed in claim 2, is characterized in that, in pre-mixing apparatus, and the diameter D of described the second straight section
3it is the inside diameter D of inner sleeve
21.2～1.5 times.
5. three grades of hybrid systems as described in any one in claim 1,2,4, is characterized in that, in pre-mixing apparatus, the tapering α of the conical section of described shell is 18 degree.
6. three grades of hybrid systems as claimed in claim 5, is characterized in that, in rear mixing arrangement, the front end face of described Impactor tapering point is apart from the distance L of described protecgulum cavity bottom
2with the ratio of the bore of upstream nozzle be 2.4.
7. three grades of hybrid systems as claimed in claim 6, is characterized in that, in rear mixing arrangement, the tapering β of described tapering point is 90-120 degree.
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|---|---|---|---|
| CN201210315609.9A CN103657497B (en) | 2012-08-30 | 2012-08-30 | For three grades of hybrid systems of liquid mixing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104147953A (en) * | 2014-08-27 | 2014-11-19 | 苏州清然环保科技有限公司 | Mixing device |
| CN105314816A (en) * | 2014-06-27 | 2016-02-10 | 宝山钢铁股份有限公司 | Sludge continuous dehydration device and sludge continuous dehydration method |
| CN111359505A (en) * | 2020-04-03 | 2020-07-03 | 常州微能节能科技有限公司 | Method for realizing stirring by utilizing fluid flow self-pulsating energy |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL154819B (en) * | 1967-05-10 | 1977-10-17 | Shell Int Research | DEVICE FOR APPLYING A LOW VISCOSITY LAYER OF LIQUID BETWEEN A FLOW OF HIGH VISCOSITY LIQUID AND THE WALL OF A PIPELINE. |
| NL7105973A (en) * | 1971-04-29 | 1972-10-31 | ||
| CN1233573C (en) * | 2004-05-02 | 2005-12-28 | 重庆大学 | Jet Aerating Reactor |
| CN2893612Y (en) * | 2006-04-11 | 2007-04-25 | 朱广 | Supersonic mixed transmission heater |
| CN102069049B (en) * | 2010-11-24 | 2014-06-18 | 华北水利水电学院 | Self-excitation aspiration pulse jet nozzle |
| CN102588353B (en) * | 2012-02-14 | 2016-02-03 | 重庆工商大学 | Self excited oscillation type jet vacuum pump |
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2012
- 2012-08-30 CN CN201210315609.9A patent/CN103657497B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105314816A (en) * | 2014-06-27 | 2016-02-10 | 宝山钢铁股份有限公司 | Sludge continuous dehydration device and sludge continuous dehydration method |
| CN105314816B (en) * | 2014-06-27 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of sludge continuous dehydration apparatus and method |
| CN104147953A (en) * | 2014-08-27 | 2014-11-19 | 苏州清然环保科技有限公司 | Mixing device |
| CN111359505A (en) * | 2020-04-03 | 2020-07-03 | 常州微能节能科技有限公司 | Method for realizing stirring by utilizing fluid flow self-pulsating energy |
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