CN104849079B - By calculating the method that alcoholic solution mixture homogeneity surveys mixing apparatus mixed effect - Google Patents
By calculating the method that alcoholic solution mixture homogeneity surveys mixing apparatus mixed effect Download PDFInfo
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Abstract
The invention discloses by calculating the method that alcoholic solution mixture homogeneity surveys mixing apparatus mixed effect.Different mixing apparatus is difficult to carry out Unify legislation with weighing to its mixed characteristic.The step of the present invention：Blender to be measured is opened up on the same cross section of exit tube wallmIndividual small sircle hole；Alcohol water blend is passed through in blender；The cross section for offering small sircle hole is divided intomIndividual fan ring sampling area；Each fan ring sampling area is divided intokIndividual fan ring sampling block；A sample point is selected in each fan ring sampling block；The alcohol relative density of each sample point is measured using densitometer；According to the alcohol relative density of alcohol water blend and the alcohol concentration table of comparisons, the anti-alcohol concentration for pushing away each sample point；Survey the flow velocity of each sample point；Calculate the mixture homogeneity of absolute alcohol and pure water at outlet.The present invention calculates each mixing apparatus outlet mixture homogeneity by calculating alcoholic solution mixture homogeneity so that the balancing method of different mixing apparatus mixed effects is unified.
Description
Technical field
The invention belongs to field of measuring technique, it is related to the mixed effect detection of mixing apparatus, and in particular to a kind of by surveying
Calculate the method that alcoholic solution mixture homogeneity surveys mixing apparatus mixed effect.
Background technology
Mixing apparatus is that the industrial circles such as chemical industry, environment, water process are commonly used, after the quality of mixed process is directly influenced
Continue the consumption of raw material, medicament, energy etc. and final product quality in each technique.
Mixability is the measurement of the uniformity coefficient of the scattered blending reached with different material by mixing；Many industries
Above, it is necessary to which intermixture is sufficiently mixed with liquid, it is ensured that follow-up process is significantly more efficient to be carried out.
Evaluation to mixing apparatus mixed effect, will determine the mixing of the mixed liquor in certain incorporation time in theory
Degree, should calculate or measure the uniformity coefficient of each moment mixer outlet section each component, because the species of mixing apparatus is a variety of more
Sample, the physical difference of fluid-mixing therein is also larger.With the presence of blender in fluid phase transformation, some fluids deposit each other
In complicated physics, chemical reaction, due to the difference of the use condition of blender so that have one to the measurement of mixture homogeneity
Fixed difficulty, at present, does not have a unified standard about the measurement of mixing uniformity.
Accurate measuring method is to use trace particle photographic process, the trace particle concentration in mixer outlet section,
This method equipment is complicated, expensive, and data processing speed is slow, is unsuitable for on-line continuous measurement, and the fluid hose of measured place
Road must do the transparent form of squarely, in order to which light was projected, and not produce deflection.Wang Zong is brave et al. in Shenyang in 2006
In chemical engineering institute's journal《The study on determination method of static mixer mixed effect》In one text, propose immiscible by measuring
The oil method that measures static mixer mixed effect with the concentration of water.
And mixed process is first since large-scale convection campaign, by being vortexed diffusion and molecule spreads, finally reach point
It is uniform in sub- level.Main body convection current can only constantly move fluid-mixing, deform and be divided into larger drop " micelle ".It is vortexed
Diffusion length by length deforms larger drop micelle, is divided into smaller micelle, by the diffusion between small micelle interface,
Degree of irregularity is reduced to the size of vortex itself.Eddy size is consecutive variations, and maelstrom is made in turbulent flow stretching, shearing
The vortex of smaller scale is split under, energy is delivered to small vortex from maelstrom, until smallest dimension is the wide love of karr horse
(Kolmogoroff) vortex of minute yardstick, finally because the effect of viscous stress dissipates as heat.Vortex diffusion can only be micelle size
It is reduced to Kolmogoroff yardsticks, it is impossible to reach complete uniform mixing, its final realization can only be leaned in smallest dimension micelle
Molecule diffusion, finally reach uniform on molecular level.Because molecular diffusion rates are much larger than vortex diffusion velocity, it is vortexed and expands
Dissipate and incorporation time is played a leading role.So, using two kinds of immiscible fluids with going measurement using two kinds of fluids dissolved each other
The result difference of mixed effect is simultaneously little, and what it really played a decisive role to mixed effect is the blended equipment of fluid stream and is formed
Hydraulics.
Further, since oil is different from the density of water so that the situation of profit layering occurs in mixing apparatus in fluid, can make
Obtain test measurement result and there is larger difference with actual mixed process.And for different mixing apparatus, the mixing to profit has
There are different behavioral traits, it is difficult to Unify legislation is carried out to its mixed characteristic with weighing.In addition, in sampling process, due to oil
It is larger by the flow resistance difference of relatively thin probe tube with water, it will certainly cause, the moisture content of samples taken, which is more than, works as
The actual moisture content in ground.
And alcohol can now dissolve each other with water, and its properties of Aqueous Solution is stable, and its density-concentration has clearly correspondence and closed
System.And existing densimeter measurement precision has reached 0.0001 [g/cm3], such as plum Teller-support benefit DM40, measurement range is
0.0000-3.0000 [g/cm3], temperature range is 0.0-91.0 DEG C, so for from principle and feasibility, completely can be with
By using absolute alcohol and the mixed effect of water, to weigh the mixed effect of various mixing apparatus.
The content of the invention
The purpose of the present invention is to be counted in view of the shortcomings of the prior art there is provided one kind by measuring alcohol and water hybrid density
The method for calculating mixture homogeneity, being capable of infinitely dissolve, and the alcohol concentration and alcohol of alcohol and aqueous mixtures using water and alcohol
There is the corresponding relation of approximately linear in relative density, difference position on same cross section is taken using high-precision densitometer
Sample, measures the alcohol relative density of alcohol water blend sample, counter to release its alcohol concentration, to calculate each mixing apparatus outlet mixing
The uniformity so that the balancing method of different mixing apparatus mixed effects is unified.
The present invention's comprises the following steps that：
Step 1: taking the blender of mixed effect to be measured, opened in blender on the same cross section of exit tube wall
Provided with m small sircle hole being uniformly distributed along the circumference, m=10~16；
Step 2: pure water is passed through by constant initial flow rate in blender, while by peristaltic pump by dosing tank
Absolute alcohol adds blender by constant initial flow rate, forms alcohol water blend；
Step 3: by the cross section for offering small sircle hole be divided into m fan ring sampling area, each small sircle hole it is centrally disposed
On the center axis of symmetry of one fan ring sampling area of correspondence；Each fan ring sampling area is radially divided into k fan ring sampling again
Block, k=3~5；The center of each fan ring sampling block is set to a sample point of alcohol water blend sample；
Step 4: being sampled successively to the sample point of blender using densitometer, the wine at each sample point is obtained
Smart relative density；When being sampled to a fan ring sampling area, the small sircle hole where remaining fan ring sampling area is blocked with bolt；
Step 5: according to the alcohol relative density of alcohol water blend and the alcohol concentration table of comparisons, it is counter to push away each sample point
Alcohol concentration；
Step 6: measuring flow velocity in each sample point using Pitot tube；
Step 7: the mixture homogeneity M of absolute alcohol and pure water at outlet is calculated, so as to measure mixing to be measured
The mixed effect of device；Wherein, σ is the standard deviation of sample relative density,For the equal of sample alcohol concentration
Value.
Standard deviation, averageSpecific calculating formula it is as follows：
Wherein, νiRepresent the flow velocity of i-th of sample point, ciRepresent the alcohol concentration of i-th of sample point, siRepresent to take for i-th
Fan ring samples the area of block where sampling point, and 1≤i≤n, n represents sample point number, n=km.
The device have the advantages that：
The present invention using water and alcohol can infinitely dissolve, and the alcohol concentration of alcohol and aqueous mixtures is relative with alcohol close
There is the corresponding relation of approximately linear in degree, the sampling using high-precision densitometer to difference position on same cross section is surveyed
Go out the alcohol relative density of alcohol water blend sample, it is counter to release its alcohol concentration, it is well mixed to calculate each mixing apparatus outlet
Degree so that the balancing method of different mixing apparatus mixed effects is unified.
Brief description of the drawings
Fig. 1 is the sample point distribution schematic diagram of alcohol water blend sample in the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
By calculating the method that alcoholic solution mixture homogeneity surveys mixing apparatus mixed effect, comprise the following steps that：
Step 1: take the blender of mixed effect to be measured, in blender close to exit (between vortex generator and outlet
That segment pipe) tube wall same cross section on offer m small sircle hole being uniformly distributed along the circumference, m=12；
Step 2: pure water is passed through by constant initial flow rate in blender, while by peristaltic pump by dosing tank
Absolute alcohol adds blender by constant initial flow rate, forms alcohol water blend；
Step 3: by the cross section for offering small sircle hole be divided into m fan ring sampling area, each small sircle hole it is centrally disposed
On the center axis of symmetry of one fan ring sampling area of correspondence；Each fan ring sampling area is radially divided into k fan ring sampling again
Block, k=3；The center of each fan ring sampling block is set to a sample point A of alcohol water blend sample, as shown in Figure 1；
Step 4: being sampled successively to the sample point of blender using densitometer, the wine at each sample point is obtained
Smart relative density；When being sampled to a fan ring sampling area, the small sircle hole where remaining fan ring sampling area is blocked with bolt；
Step 5: the alcohol relative density of the alcohol water blend according to table 1 is compareed with alcohol concentration (ethanol content)
Table (20 DEG C), the anti-alcohol concentration for pushing away each sample point；
Step 6: measuring flow velocity in each sample point using Pitot tube；
Step 7: the mixture homogeneity M of absolute alcohol and pure water at outlet is calculated, so as to measure mixing to be measured
The mixed effect of device；Wherein, σ is the standard deviation of sample relative density,For the equal of sample alcohol concentration
Value；
Standard deviation, averageSpecific calculating formula it is as follows：
Wherein, νiRepresent the flow velocity of i-th of sample point, ciRepresent the alcohol concentration of i-th of sample point, siRepresent to take for i-th
Fan ring samples the area of block where sampling point, and 1≤i≤n, n represents sample point number, n=km.
If no condition is tested using distilled water, running water can be used, but need first to local running water and alcohol
The alcohol concentration of mixed liquor is demarcated with alcohol relative density relation.
The alcohol relative density of the alcohol water blend of table 1 and alcohol concentration (ethanol content) table of comparisons (20 DEG C)
Claims (2)
1. by calculating the method that alcoholic solution mixture homogeneity surveys mixing apparatus mixed effect, it is characterised in that：This method has
Body step is as follows：
Step 1: taking the blender of mixed effect to be measured, offered in blender on the same cross section of exit tube wall
M small sircle hole being uniformly distributed along the circumference, m=10~16；
Step 2: pure water is passed through by constant initial flow rate in blender, while will be anhydrous in dosing tank by peristaltic pump
Alcohol adds blender by constant initial flow rate, forms alcohol water blend；
Step 3: the cross section for offering small sircle hole is divided into m fan ring sampling area；Each fan ring sampling area is radially drawn again
It is divided into k fan ring sampling block, k=3~5；The center of each fan ring sampling block is set to a sample point of alcohol water blend sample；
Step 4: being sampled successively to the sample point of blender using densitometer, the alcohol phase at each sample point is obtained
To density；When being sampled to a fan ring sampling area, the small sircle hole where remaining fan ring sampling area is blocked with bolt；
Step 5: according to the alcohol relative density of alcohol water blend and the alcohol concentration table of comparisons, the anti-wine for pushing away each sample point
Smart concentration；
Step 6: measuring flow velocity in each sample point using Pitot tube；
Step 7: the mixture homogeneity M of absolute alcohol and pure water at outlet is calculated, so as to measure blender to be measured
Mixed effect；Wherein, σ is the standard deviation of sample relative density,For the average of sample alcohol concentration；
The standard deviation, averageSpecific calculating formula it is as follows：
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Wherein, νiRepresent the flow velocity of i-th of sample point, ciRepresent the alcohol concentration of i-th of sample point, siRepresent i-th of sample point
Place fan ring samples the area of block, and 1≤i≤n, n represents sample point number, n=km.
2. it is according to claim 1 by calculating the method that alcoholic solution mixture homogeneity surveys mixing apparatus mixed effect,
It is characterized in that：Being centrally disposed in for each small sircle hole is corresponded on a center axis of symmetry for fanning ring sampling area.
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| CN109839328A (en) * | 2017-11-25 | 2019-06-04 | 深圳格林德能源集团有限公司 | The determination method of pulp of lithium ion battery dispersion effect |
| CN113289541B (en) * | 2020-08-20 | 2022-06-21 | 湖南长天自控工程有限公司 | Mixer control system and method based on uniformity prediction |
| CN112098598B (en) * | 2020-08-28 | 2022-08-23 | 杭州电子科技大学 | Detection method and detection device for mixing effect of mixer |
Citations (4)
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|---|---|---|---|---|
| DE4036344C2 (en) * | 1990-11-15 | 1997-11-20 | Gebhard Dipl Ing Schramm | Measuring method and instrument for determining the foaming and decay behavior of liquids |
| CN1766642A (en) * | 2005-10-20 | 2006-05-03 | 上海交通大学 | Method for in-situ detecting quality of deep-cement-mixed soil based on mixing uniformity |
| CN1967213A (en) * | 2006-11-08 | 2007-05-23 | 北京中医药大学中药学院 | Method for degree of homogeneity for different matter |
| CN102980919A (en) * | 2012-10-30 | 2013-03-20 | 上海交通大学 | Determination method for uniformity of soil-cement admixture based on joint test of pH value and conductivity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012000044A1 (en) * | 2010-06-30 | 2012-01-05 | Mezurx Pty Ltd | Mixing process and apparatus |
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2015
- 2015-04-29 CN CN201510214665.7A patent/CN104849079B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4036344C2 (en) * | 1990-11-15 | 1997-11-20 | Gebhard Dipl Ing Schramm | Measuring method and instrument for determining the foaming and decay behavior of liquids |
| CN1766642A (en) * | 2005-10-20 | 2006-05-03 | 上海交通大学 | Method for in-situ detecting quality of deep-cement-mixed soil based on mixing uniformity |
| CN1967213A (en) * | 2006-11-08 | 2007-05-23 | 北京中医药大学中药学院 | Method for degree of homogeneity for different matter |
| CN102980919A (en) * | 2012-10-30 | 2013-03-20 | 上海交通大学 | Determination method for uniformity of soil-cement admixture based on joint test of pH value and conductivity |
Non-Patent Citations (1)
| Title |
|---|
| 开缝式SK型静态混合器与可调涡旋静态混合器的性能数值优化;聂欣等;《热力发电》;20141130;第43卷(第11期);第51-57页 * |
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Inventor after: Nie Xin Inventor after: Tao Xuefeng Inventor after: Zhang Tongwei Inventor after: Yu Heng Inventor after: Lv Ming Inventor after: Xu Jiangrong Inventor before: Nie Xin Inventor before: Xu Jiangrong Inventor before: Gu Wang Inventor before: Yu Heng Inventor before: Lu Yiding Inventor before: Li Mengwei Inventor before: Yu Hui Inventor before: Jiang Chengcheng |
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