CN103657497B - For three grades of hybrid systems of liquid mixing - Google Patents

For three grades of hybrid systems of liquid mixing Download PDF

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Publication number
CN103657497B
CN103657497B CN201210315609.9A CN201210315609A CN103657497B CN 103657497 B CN103657497 B CN 103657497B CN 201210315609 A CN201210315609 A CN 201210315609A CN 103657497 B CN103657497 B CN 103657497B
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mixing
grades
hybrid systems
shell
protecgulum
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CN103657497A (en
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李宏
邢丰
钟铭
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention discloses a kind of three grades of hybrid systems for liquid mixing, it comprises: a pump, has an agitator arm in described pump; One pre-mixing apparatus, its flow direction along mixing material is located at the front of described pump; Mixing arrangement after one, its flow direction along mixing material is located at the rear of described pump.Three grades of hybrid systems of the present invention are by the design of three grades of mixing, and make it that high polymer coagulant rapid mixing in solid-liquid two-phase flow can be made even, its structure is simple, convenient and practical in addition.

Description

For three grades of hybrid systems of liquid mixing
Technical field
The present invention relates to a kind of mixing arrangement, particularly relate to a kind of apparatus for combining liquids.
Background technology
In wastewater treatment process, the mud after pretreated waste liquid and secondary precipitation needs to enter in suspension pond and adds 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 carries out flocculating.For removing the pollutant in waste water, needing in water, add appropriate flocculant, after a series of mixing, flocculation process, forming floccule body, thus ensureing, in follow-up precipitation process, 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 do not remove impurities in water particle, are for precipitation, filtering technique create necessary condition.
When suspension liquid is a kind of solid-liquid two-phase flow, high polymer coagulant is not easily distributed in suspension liquid because viscosity is high.If be directly added on by flocculant in suspension pond, the flocculating effect that can weaken medicament causes the waste of medicament, and the follow-up settling property at concentration basin is deteriorated, and finally causes sheet frame mud extraction moisture content to improve.In order to obtain best flocculating effect, flocculant solution must be made to mix in suspension liquid.
The hybrid technology of general medicament is mainly divided static mixing and is dynamically mixed two kinds of modes at present:
Dynamic mixing is mainly through mixing plant, its whipping process in tank diameter, inputs mechanical energy by the rotation of blade, thus make fluid obtain suitable flow location form, and in flow field, carry out the transmission of momentum, heat and quality or carry out the process of chemical reaction.Churned mechanically mixing pit is considered to the high mixing apparatus of a kind of efficiency for a long time, and its current feature is the character with back-mixing.But mixing plant generally applies in less reactive tank, as fruit suspension pond volume is very large, single-point adds flocculant effect will be poor, and multi-point adding flocculant is also difficult to control dose.
Static mixer is relative dynamic blender and proposes, it is the different structure by fluid circuit, be able to the mixing carrying out fluid in very wide reynolds number range, and there is no the fluid circuit structure of mechanical type movable member, the component of this special, tactical rule is placed in pipeline, when the materials such as two or more fluids are by constantly being cut and turn to during these components, make it to mix.This device can be arranged on suspension elevator pump outlet conduit place, but containing a large amount of mud in the medium of transport pump, the pipeline structure of its complexity is easy to its inside is blocked.
A kind of jet flow mixing device is also had in static mixer.Fluidic device is made up of a centre-driven nozzle and an annular suction passage, is driven by pressure water source, suck medium and also 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, having dividing plate reactor, Cyclonic reactor, waterpower clarifier, pulse clarifier, flap reactor, corrugated plating reactor, grid reaction device etc., all there is fabrication and installation difficulty, easily blocking, operation maintenance inconvenience, flocculating effect by the shortcoming such as impact of changes in flow rate in it.
Summary of the invention
The object of this invention is to provide a kind of three grades of hybrid systems for liquid mixing, it should make high polymer coagulant rapid mixing in solid-liquid two-phase flow even, and it also should meet simple, the convenient and practical requirement of structure in addition.
Mixed process is by main diffusion, DIFFUSION IN TURBULENCE and molecular diffusion under forced flow effect, finally reaches molecule level Homogeneous phase mixing.First the medicament just 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 then to less vortex transmission, until more small scale, finally because the effect of viscous stress dissipates as heat.In this course, hydraulics plays a decisive role to mixing, therefore how to control hydraulics, and how effectively eliminating large scale vortex, can increase the ratio of small vortex, namely how increase particles collision number of times, be the key that improve mixing efficiency.
Flocculant with have himself condition in the mixing of solid-liquid two-phase flow, the first mixes, the connection of the conjunction flocculating agent molecule making solid particle have equal opportunity to live; It two is quick, once mix, must stop mixing, keep the even fluidised form of fluid, destroys in order to avoid strand is useless, 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 for liquid mixing, 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 front of described pump;
Mixing arrangement after one, 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, along the flow direction of mixing material, the inwall of this shell has one first straight section, a conical section and one second straight section that are connected successively, the diameter of described second straight section is less than the diameter of the first straight section, described first straight section has the groove of an annular, described shell also offers 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, is all located in the cavity of protecgulum to make described tapering point, described tapering point has a downstream nozzle, and described downstream nozzle and upstream nozzle coaxially or are almost coaxially arranged;
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 2for the internal diameter of described inner sleeve.
Further, in the rear in 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 second straight section 3the internal 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 2be 2.4 with the ratio of the bore of upstream nozzle.
Further, in rear mixing arrangement, the tapering β of described tapering point is 90-120 degree.
Three grades of hybrid systems for liquid mixing of the present invention, by the design of three grades of mixing, make it that high polymer coagulant rapid mixing in solid-liquid two-phase flow can be made even, its structure is simple, convenient and practical in addition.
Accompanying drawing explanation
Fig. 1 shows the structure of three grades of hybrid systems for liquid mixing of the present invention.
Fig. 2 is the structure chart of the three grades of hybrid systems pre-mixing apparatus in one embodiment for liquid mixing of the present invention.
Fig. 3 is the fundamental diagram for pre-mixing apparatus in three grades of hybrid systems of liquid mixing of the present invention.
Fig. 4 is the structure chart of the three grades of hybrid systems rear mixing arrangement in one embodiment for liquid mixing of the present invention.
Fig. 5 is the fundamental diagram for mixing arrangement rear in three grades of hybrid systems of liquid mixing of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description and embodiment, explanation is further explained to technical solutions according to the invention.
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 does transport motion along with the rotation of impeller, liquid constantly flows out again from the impeller rotated simultaneously, relative to impeller motion, by this compound motion, flocculant and suspension liquid obtain the stirring of high strength, due to the common equipment that the stifled dredge pump 16 of nothing is in this area, therefore the technical program no longer describes in detail to it.Three grades of hybrid systems are except above-mentioned nothing blocks up dredge pump 16, and the flow direction also comprised along mixing material is located at the pre-mixing apparatus 15 that nothing blocks up the upstream of dredge pump 16, and is located at the rear mixing arrangement 17 in the downstream without stifled dredge pump 16.
Fig. 2 shows 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 the inner sleeve 2 be located 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, second straight section 13 be connected successively 3be less than the diameter D of the first straight section 11 1, the first straight section 11 has the groove of an annular, and this groove and inner sleeve 2 define medicament buffering area 3, and shell 1 also offers medicament inlet 4, this medicament inlet 4 and medicament buffering area 3 conducting.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 and shell 1 are threaded connection, 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 1have larger impact to the mixed performance of pre-mixing apparatus, inventor finds L by lot of experiments 1get the D of 0.5 ~ 1 times 2, D 2for the internal diameter of inner sleeve 2.In addition, in order to better produce entrainmenting property, inventor designs the diameter D of the second straight section 13 3the internal 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 are 18 degree, the width of annular gap 5 is 1mm.
Pre-mixing apparatus in the technical program have employed jet current principle.Because the space in pipeline is limited, the jet of device belongs to Confined space jet.Fig. 3 shows the operation principle of pre-mixing apparatus.As shown in Figure 3, in Liu He district 31, jet core speed remains unchanged, and namely has stream core to exist.At skin, due to the impact on Gu Bi border, be subject to the shear action of Gu Bi by flow type pump with injection, 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 wall rapidly, and stream core disappears, and the residue section of each parameter in flow field is at this district's basic simlarity, and this district is the most fundamental region that Confined space jet flows.In recirculating zone 33, jet entrainmented all by flow type pump with injection before expanding to Gu Bi, Gu wall boundary layer can be separated, produced backflow in the flowing direction.Attached by being separated to again at Guan Liuqu 34 inner boundary layer, (produce then after jet expands to Gu Bi without backflow) after dot again, jet mixes close to even with by flow type pump with injection, flow velocity reaches unanimity, in downstream, area far away presents the flow behavior of pipe stream completely, is greatly improved by the uniformity of this process flocculation mixing.
Fig. 4 shows 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 to make tapering point all be located in the cavity of protecgulum 6, tapering point offers downstream nozzle 71, and downstream nozzle 71 and upstream nozzle 61 are coaxially arranged; 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 distance L of front end face distance protecgulum 6 cavity bottom of Impactor 7 tapering point 2there is material impact to the generation of self-oscillation whirlpool, in order to produce the self-oscillation effect of larger amplification, in the technical program, requiring L 2with the bore D of 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, therefore D 6=78mm, the internal diameter D of protecgulum cavity 5meet D 5/ D 4between=2 ~ 10, easy in order to process, D in the present embodiment 5=130mm.
It is emphasized that the concentricity of upstream nozzle 61 and downstream nozzle 71 is extremely important for the work of rear mixing arrangement, 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 have employed the self-oscillation principle of fluid.Self-oscillation, be exactly must not under extrinsic motivated condition, this produces spontaneous vibration by under special boundary condition in suitable fluidic structures to utilize fluid.Self-oscillation, by producing certain whirlpool in pipeline, then improves the collision frequency of particle in hybrid reaction by the whirlpool in pipeline, improve mixing efficiency.Fig. 5 shows the operation principle of above-mentioned rear mixing arrangement.As shown in Figure 5, when one high-pressure spray flows into axial symmetry chamber, be filled with stationary fluid in resonator, high-pressure spray and surrounding static fluid produce Turbulent Mixing, produce strong momentum-exchange, form the turbulent shear layer along flowing to progressive additive, because high-pressure spray speed is large, shear layer is burble shear layer and is unstable, therefore the fluid around shear layer is produced vortex by carrying secretly, because shear layer is axisymmetric, therefore vortex exists and motion with the form of collar vortex 38 symmetry.It is Disengagement zone 35 near the intersection of shear layer and inactive liquid, namely flowing from boundary layer distribution turns to shear layer to distribute, the very large and region of instability of velocity gradient is there is in shear layer, orderly macrostructure vortex will be induced, vorticity disturbance in high-pressure spray within the scope of certain frequency is amplified, in shear layer, form series of discrete collar vortex 38, because shear layer is axisymmetric, the collar vortex 38 therefore formed also is symmetrical along chamber axle center.When it is to downstream movement, collide with downstream impact walls 36, certain pressure disturbance ripple is produced in impact zone, this pressure disturbance ripple is upstream propagated with SVEL, arrive the initially-separate district of upstream vicinity, and the disturbance of 35 pairs, Disengagement zone is quite responsive, new vorticity fluctuation can be brought out again, because shear layer unstability has optionally amplification to disturbance, when the vorticity fluctuation that mixed turbulent carried as side-arm flows to downstream travel meets its amplification condition in shear layer, then this disturbance is just amplified in shear layer.Disturbance after amplification collides with impact walls again, constantly repeats said process again.In this self-oscillation process, the endocorpuscular collision frequency of fluid obtains significant increase, improves mixing efficiency.
Please continue to refer to Fig. 1, operationally, the compressed air in gas bag 10 is by the action of pressure-reducing valve 11 pressure regulation rear drive membrane pump 12, thus the flocculant in conveying storage tank 13 is in pre-mixing apparatus 15 for three grades of hybrid systems in the present embodiment.Without stifled dredge pump 16, the suspension liquid in suspension pond 14 is smoked, mix with flocculant generation one-level at pre-mixing apparatus 15 place; Enter without after stifled dredge pump 16, the mixing of high strength secondary occurs; Finally, after the mixing of mixing arrangement 17 3 grades later by Cemented filling to aftertreatment systems.
Please continue to refer to Fig. 1 and Fig. 2, first order mixed process mainly utilizes waterpower to be diffused into fast in added current by flocculant.First flocculant enters in the medicament buffering area 3 of pre-mixing apparatus 15, then mixed zone C is entered by annular gap 5, with the suspension generation recirculate mixing entered 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 comparatively large, make flocculant be subject to throttling action through these two regions, pressure decreases, slow down the pulse of membrane pump, guarantee that stable pressure is delivered to without stifled dredge pump 16 entrance.The circular nature of annular gap 5 makes flocculant and pipeline internal medium more can uniform contact, and its angle is parallel with pipeline, can not produce resistance, effectively slow down the cavitation phenomenons without stifled dredge pump 16 to the liquid sucked 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.After entering Guan Liuqu B, two kinds of fluid chemical field are close to even, and flow velocity reaches unanimity, and reveals the flow behavior of pipe stream completely, forms the vortex micelle of large scale.
Please continue to refer to Fig. 1, second level mixed process is a kind of mechanical agitation process of high strength.By the impeller without stifled dredge pump 16 to the stirring action of fluid, first the medicament just 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, third level mixing is a kind of static mixing, it utilizes fluid self-oscillation principle, fluid collides at self-oscillation district D and Impactor 7, produce violent eddy current, under very strong shearing force acts on fluid, make the fine fraction of fluid divided further and mix.Meanwhile, the flowing of fluid meets with obstruction, and stabilizes 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.
That enumerates it should be noted that above is only specific embodiments of the invention, obviously the invention is not restricted to above specific embodiment, has many similar changes and distortion thereupon.If all distortion that those skilled in the art directly derives from content disclosed by the invention or associates and change, all should belong to protection scope of the present invention.

Claims (7)

1., for three grades of hybrid systems of liquid mixing, it 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 front of described pump;
Mixing arrangement after one, 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, along the flow direction of mixing material, the inwall of this shell has one first straight section, a conical section and one second straight section that are connected successively, the diameter of described second straight section is less than the diameter of the first straight section, described first straight section has the groove of an annular, described shell also offers 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, is all located in the cavity of protecgulum to make described tapering point, described tapering point has a downstream nozzle, and described downstream nozzle and upstream nozzle coaxially or are almost coaxially arranged;
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 2for the internal diameter of described inner sleeve.
3. three grades of hybrid systems as claimed in claim 1 or 2, is characterized in that, in the rear in 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 second straight section 3the internal diameter D of inner sleeve 21.2 ~ 1.5 times.
5. as three grades of hybrid systems in claim 1,2,4 as described in any one, it 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 2be 2.4 with the ratio of the bore of upstream nozzle.
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.
CN201210315609.9A 2012-08-30 2012-08-30 For three grades of hybrid systems of liquid mixing Active CN103657497B (en)

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Publication number Priority date Publication date Assignee Title
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
CN104147953B (en) * 2014-08-27 2016-08-17 苏州清然环保科技有限公司 Mixing arrangement
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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US3826279A (en) * 1971-04-29 1974-07-30 Shell Oil Co Oil/water pipeline inlet with means for producing a uniform oil velocity
CN1569691A (en) * 2004-05-02 2005-01-26 重庆大学 Jet Aerating Reactor
CN2893612Y (en) * 2006-04-11 2007-04-25 朱广 Supersonic mixed transmission heater
CN102069049A (en) * 2010-11-24 2011-05-25 华北水利水电学院 Self-excitation aspiration pulse jet nozzle
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Publication number Priority date Publication date Assignee Title
US3502103A (en) * 1967-05-10 1970-03-24 Shell Oil Co Inlet device for introducing water and oil in a pipeline
US3826279A (en) * 1971-04-29 1974-07-30 Shell Oil Co Oil/water pipeline inlet with means for producing a uniform oil velocity
CN1569691A (en) * 2004-05-02 2005-01-26 重庆大学 Jet Aerating Reactor
CN2893612Y (en) * 2006-04-11 2007-04-25 朱广 Supersonic mixed transmission heater
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