CN105067621A - Method for judging multi-phase mixing uniformity - Google Patents
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- CN105067621A CN105067621A CN201510503871.XA CN201510503871A CN105067621A CN 105067621 A CN105067621 A CN 105067621A CN 201510503871 A CN201510503871 A CN 201510503871A CN 105067621 A CN105067621 A CN 105067621A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000013461 design Methods 0.000 claims abstract description 19
- 238000002474 experimental method Methods 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000010348 incorporation Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 4
- 238000011160 research Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000003889 chemical engineering Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000000342 Monte Carlo simulation Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006194 liquid suspension Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000013442 quality metrics Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The invention discloses a method for judging the multi-phase mixing uniformity, and belongs to the technical field of chemical engineering. The method for judging the multi-phase mixing uniformity based on the uniform experiment design is mainly used for judging a fluid mixing effect and theoretically guiding the design of process parameters in chemical and metallurgical stirring equipment. The method for judging the multi-phase mixing uniformity is simple and convenient and has a very high practical value; the simple and practical method is provided for judging the mixing uniformity and theoretically guiding the design of a stirring reactor in the chemical and metallurgical stirring equipment.
Description
Technical field
The present invention relates to a kind of method judging multi-phase mixing uniformity, belong to technical field of chemical engineering.
Background technology
Stirring is one of modal operation in chemical industry, metallurgical process.During 60 ~ eighties, fluid mixing techniques obtains development at full speed greatly, and emphasis of its research mainly carries out experimental study for convention stir oar in the low sticky macroscopic quantity such as agitated flow, incorporation time of gluing in the heterogeneous systems such as non newtonian homogeneous system, solid-liquid suspension and Gas-Liquid Dispersion with height.Although what have a large amount of design experiences and correlation can be used for analysis and prediction mixed system, but stirred reactor is directly amplified to large-scale commercial production from laboratory scale, being still and being not sure, still needing so far to reach mass transfer required by mixing plant, heat transfer and mixing by amplifying step by step.This method not only expends financial resources and a large amount of man power and materials, and the design cycle is very long, and the chemical industry according to the ASSOCIATE STATISTICS display U.S. is about l0 ~ 10,000,000,000 dollar every year because stirred reactor designs unreasonable caused loss.Therefore advanced means of testing and the velocity field set up in rational mathematical model acquisition tank diameter, temperature field and concentration field is adopted, and take the method for effective measuring mixing effect of fluid, not only to the optimal design of mixing apparatus, there is very important economic implications, and to the fundamental research of amplifying and mix, there is the theory significance of reality.Just see at present, the method of measuring mixing effect of fluid is numerous, mainly contains electrical conductivity method, thermocouple method, optical method, decoloring method etc., and wherein electrical conductivity method is applied very wide in being uniformly mixed of low viscosity fluid, but high to the requirement of agitated medium, as required, agitated medium is deionized water; Thermopair rule stream field can produce destruction; General optical method, due to device complexity, is applied also less; It is very effective that decoloring method is used for surveying highly viscous fluid and viscoelastic fluid, but owing to adopting naked eyes to judge, thus with stronger subjectivity.
Summary of the invention
Instant invention overcomes the deficiency of said method, a kind of that have higher using value, simple and feasible method for judging multi-phase mixing uniformity being provided, specifically comprising the following steps:
(1) in the mixed process of transparent tank diameter, obtain continuous print in gas-liquid-solid heterogeneous mixed process and stir real-time pattern and preserve; And utilize digital image processing techniques to obtain the pending pattern of only having powerful connections with target; Using the target in pending pattern as research object;
(2) according to the size of pending original pattern, corresponding from the upper left corner
, the lower left corner is corresponding
, the lower right corner is corresponding
, the upper right corner is corresponding
carry out stress and strain model as reference position, divide respectively
individual region
for natural number, and each zonule is numbered
;
(3) use uniform experiment design theoretical, tolerance
tthe method of moment mixing uniformity calculates as follows:
1. the number ratio with the target in overall pattern in a zonule is calculated:
;
2. the area ratio in this zonule and overall pattern is calculated:
;
3. target number is calculated than the absolute deviation with region pattern area ratio:
;
4. the mean value of absolute deviation is calculated:
;
5.
tthe uniformity coefficient of moment pattern is:
, wherein
represent median;
(4) theoretical by uniform experiment design, in incorporation time
tfront and back,
obvious Changing Pattern can be presented; If experience sufficient incorporation time
tafter,
numerical values recited fluctuation be bordering on 1, if draw
change curve, then exist
tafter moment,
just be in close proximity to 1 and in time backward fluctuation little, then represent heterogeneous being blended in
tthe state mixed is reached after moment.
If the division obtaining real-time pattern grid in mixed process is single from some reference positions, be generally divided into
individual region (
for natural number), the division principle in region judges accuracy requirement to determine according to pattern and target sizes, mixing uniformity
value size,
the larger precision of value higher, the length breadth ratio of zonule is equal with the length breadth ratio of original pattern.
Obtain continuous print in gas-liquid-solid heterogeneous mixed process in step of the present invention (1) stir real-time pattern and preserve, and utilize digital image processing techniques to obtain the pending pattern of only having powerful connections with target; This process is conventional method, such as, utilizes high-speed camera to stir real-time video to obtain continuous print in heterogeneous mixed process in prior art; Video software KMPlayer is utilized to be that real-time pattern preserves by Video Quality Metric.
In statistics, uniform experiment design only considers a kind of test design method of testing site uniformly dispersing in trial stretch; Theoretical according to uniform experiment design, the tolerance of homogeneity adopts number theory method (pseudo-monte carlo method), the most generally adopts
deviation; What adopt herein is work as
time corresponding
deviation; At pilot region
(this herein,
) upper cloth
nindividual testing site
, order
,
for
in by initial point 0 to
the rectangle determined.Order
for
in test count, when
during middle distribution even test point,
should be with
volume
be close; In brief, when counting in pilot region than when comparing closely with rectangular area, namely think that testing site is dispersed evenly to pilot region, we are referred to as polyphasic flow and mix.
The invention has the beneficial effects as follows:
(1) the method simple possible, has the uniform experiment design theory of statistics to support;
(2) weak point of electrical conductivity method, thermocouple method, optical method, decoloring method etc. is solved;
(3) economic loss that stirred reactor causes because of irrational design can be reduced.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Fig. 2 is that the present invention is by the upper left corner
as the pattern stress and strain model figure of reference position; Filled black part is reference position (S=1).
Fig. 3 is that the present invention is by the lower left corner
as the pattern stress and strain model figure of reference position; Filled black part is reference position (S=1).
Fig. 4 is that the present invention is by the lower right corner
as the pattern stress and strain model figure of reference position; Filled black part is reference position (S=1).
Fig. 5 is that the present invention is by the upper right corner
as the pattern stress and strain model figure of reference position; Filled black part is reference position (S=1).
Fig. 6 is of the present invention
variation diagram in time.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but protection scope of the present invention is not limited to described content.
Embodiment 1
Use for reference CH
4with the polyphasic flow reaction model of ZnO in fuse salt, built gas top blast and stirred hydrodynamics experiment porch, when being under initial static state, the carrier of oxygen falls to bottom molten bath with solid granular form, when blasting reacting gas CH from reactor top blast
4after, under the effect that is uniformly mixed of gas, the carrier of oxygen can be dispersed in whole molten bath, forms reflection system as fluidized bed as, that is: whole reaction is that a gas-liquid-solid polyphasic flow reacts; For simplifying experimental provision and do not lose representativeness, choose material needed for experiment and reagent is mainly common water, N
2and diameter is the black polystyrene particle of 0.45 millimeter; The different depth immersed by the different flow and spray gun of considering top-blown gas designs multiple stirring condition, then utilizes high-speed camera to take the flowing pattern of solid granule under top-blown gas beating action.
Concrete implementation step is as follows:
(1) N
2sprayed from top to bottom by the glass tube spray gun of a vertical movement, spray gun caliber size immobilizes, but gas flow and spray gun immersion depth can for adjustment; The quality of water and the quality of solid particle are all certain, and wherein polystyrene black particle is the bottom being tiled in glass reactor when testing, and carry out mix and blend, the N in chemical reactor only by injection nitrogen as power
2, granules of polystyrene and water is exactly formed some special flowing patterns by such alr mode.
(2) use the continuous videos of the vertical section of high-speed camera collection shown in Fig. 1, use video software KMPlayer, catch down the pattern of each frame; Then utilize MATLAB to implement digital number image processing techniques, obtain pending image through greyscale transformation, cap transformation, filtering operation, binaryzation and opening operation process.
(2) pending pattern is carried out Region dividing, corresponding from the upper left corner
, the lower left corner is corresponding
, the lower right corner is corresponding
, the upper right corner is corresponding
carry out stress and strain model as reference position, divide 16 regions respectively, and each zonule is numbered
;
(3) use uniform experiment design theoretical, tolerance
the method of moment mixing uniformity calculates as follows:
1. the number ratio with the target in overall pattern in a zonule is calculated:
.
The upper left corner (
) number ratio is: 0.0010,0.0010,0.0042,0.0120,0.0345,0.0734,0.1182,0.1747,0.2457,0.3423,0.4432,0.5518,0.6640,0.7793,0.8997,1.0000;
The lower left corner (
) number ratio is: 0.0002,0.00660.0202,0.0475,0.0883,0.1411,0.2059,0.2789,0.3579,0.4530,0.5648,0.6762,0.7798,0.8718,0.9480,1.0000;
The lower right corner (
) number ratio is: 0.0018,0.0105,0.0295,0.0574,0.0964,0.1477,0.2193,0.3000,0.3944,0.4924,0.6003,0.7207,0.8208,0.9089,0.9565,1.0000;
The upper right corner (
) number ratio is: 0.0007,0.0032,0.0142,0.0324,0.0644,0.1139,0.1756,0.2464,0.3262,0.4156,0.5006,0.6068,0.7057,0.8148,0.9063,1.0000;
2. the area ratio in this zonule and overall pattern is calculated:
.
The upper left corner (
) area ratio is: 0.0039,0.0156,0.0352,0.0625,0.0977,0.1406,0.1914,0.2500,0.3164,0.3906,0.4727,0.5625,0.6602,0.7656,0.8789 and 1.0000;
The lower left corner (
) area ratio is: 0.0039,0.0156,0.0352,0.0625,0.0977,0.1406,0.1914,0.2500,0.3164,0.3906,0.4727,0.5625,0.6602,0.7656,0.8789 and 1.0000;
The lower right corner (
) area ratio is: 0.0039,0.0156,0.0352,0.0625,0.0977,0.1406,0.1914,0.2500,0.3164,0.3906,0.4727,0.5625,0.6602,0.7656,0.8789 and 1.0000;
The upper right corner (
) area ratio is: 0.0039,0.0156,0.0352,0.0625,0.0977,0.1406,0.1914,0.2500,0.3164,0.3906,0.4727,0.5625,0.6602,0.7656,0.8789 and 1.0000;
3. target number is calculated than the absolute deviation with region pattern area ratio:
.
The upper left corner (
) absolute deviation is: 0.0029,0.0146,0.0309,0.0505,0.0632,0.0672,0.0732,0.0753,0.0707,0.0483,0.0294,0.0107,0.0039,0.0136,0.0208,0;
The lower left corner (
) area ratio is: 0.0037,0.0090,0.0150,0.0150,0.0093,0.0004,0.0145,0.0289,0.0415,0.0624,0.0921,0.1137,0.1197,0.1062,0.0691,0;
The lower right corner (
) area ratio is: 0.0021,0.0051,0.0056,0.0051,0.0012,0.0070,0.0279,0.0500,0.0780,0.1017,0.1277,0.1582,0.1607,0.1433,0.0776,0;
The upper right corner (
) area ratio is: 0.0032,0.0124,0.0210,0.0301,0.0333,0.0267,0.0159,0.0036,0.0098,0.0250,0.0279,0.0443,0.0455,0.0492,0.0274,0;
4. the mean value of absolute deviation is calculated:
;
After the computing carrying out 4 angles, calculating mean absolute deviation is: 0.0030,0.0103,0.0181,0.0252,0.0267,0.0253,0.0329,0.0394,0.0500,0.0594,0.0693,0.0817,0.0824,0.0781,0.0487,0;
5.
the uniformity coefficient of moment pattern is:
, wherein
for median;
Final calculating
the uniformity coefficient of moment pattern be 0.9639. 1. similar ~ 5. step, calculate the uniformity coefficient in other moment, partial data (data have 500) is as follows successively: 0.939357235916417, 0.909570362583631, 0.902455628679390, 0.934843059712128, 0.942116295370033, 0.913261325923245, 0.930138086538828, 0.897325073446152, 0.925889388977547, 0.936786099075402, 0.944416821238247, 0.914719842914128, 0.930100811248494, 0.949240266159665, 0.950410111103229, 0.953723600034418, 0.930788402060183, 0.951252482116207, 0.896746433478823, 0.859610547932562, 0.902868476854514, 0.873579129496495, 0.865606883523398, 0.863530648982136, 0.902804123755286, 0.904152042239641, 0.845595571706213, 0.883584062119069, 0.863651742650436, 0.846244221263190, 0.858945595253722, 0.855847575167351, 0.842705478700894, 0.845253026528311, 0.850729807829946, 0.876583288251411, 0.856507593084105, 0.849324879199439, 0.892330341732519, 0.850151657965971, 0.849603273762746, 0.857279523145904, 0.846530705828734,The critical point that uniformity coefficient is occurred in obviously fluctuation change is defined as incorporation time: the 168th frame.As shown in Figure 6.
(4) theoretical by uniform experiment design, in incorporation time
tfront and back,
obvious Changing Pattern can be presented; If experience sufficient incorporation time
tafter,
numerical values recited fluctuation be bordering on 1, if draw
change curve, then exist
tafter moment,
just be in close proximity to 1 and in time backward fluctuation little, then represent heterogeneous being blended in
tthe state mixed is reached after moment.
Claims (2)
1. judge a method for multi-phase mixing uniformity, it is characterized in that, specifically comprise the following steps:
(1) in the mixed process of transparent tank diameter, obtain continuous print in gas-liquid-solid heterogeneous mixed process and stir real-time pattern and preserve; And utilize digital image processing techniques to obtain the pending pattern of only having powerful connections with target; Using the target in pending pattern as research object;
(2) according to the size of pending original pattern, corresponding from the upper left corner
, the lower left corner is corresponding
, the lower right corner is corresponding
, the upper right corner is corresponding
carry out stress and strain model as reference position, divide respectively
individual region
for natural number, and each zonule is numbered
;
(3) use uniform experiment design theoretical, tolerance
tthe method of moment mixing uniformity calculates as follows:
1. the number ratio with the target in overall pattern in a zonule is calculated:
;
2. the area ratio in this zonule and overall pattern is calculated:
;
3. target number is calculated than the absolute deviation with region pattern area ratio:
;
4. the mean value of absolute deviation is calculated:
;
5.
tthe uniformity coefficient of moment pattern is:
, wherein
represent median;
(4) theoretical by uniform experiment design, in incorporation time
tfront and back,
obvious Changing Pattern can be presented; If experience sufficient incorporation time
tafter,
numerical values recited fluctuation be bordering on 1, if draw
change curve, then exist
tafter moment,
just be in close proximity to 1 and in time backward fluctuation little, then represent heterogeneous being blended in
tthe state mixed is reached after moment.
2. the method for judgement multi-phase mixing uniformity according to claim 1, is characterized in that, the length breadth ratio of step (2) small area is equal with the length breadth ratio of original pattern.
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| CN105910996A (en) * | 2016-04-07 | 2016-08-31 | 昆明理工大学 | Method for determining mixing time of multiphase flow by using RGB color model |
| CN106546591A (en) * | 2016-11-07 | 2017-03-29 | 首钢总公司 | A kind of detection method of sintering deposit uniformity |
| CN108072740A (en) * | 2016-11-10 | 2018-05-25 | 内蒙古伊利实业集团股份有限公司 | A kind of assay method of the mixture homogeneity of dry mixed powder product |
| CN109785342A (en) * | 2019-01-15 | 2019-05-21 | 昆明理工大学 | A kind of analysis method of the animal meat quality uniformity |
| CN109903243A (en) * | 2019-02-20 | 2019-06-18 | 云南农业大学 | A method of multiphase stirring and mixing effect is characterized based on Logistics model |
| CN110068575A (en) * | 2019-04-29 | 2019-07-30 | 嘉兴学院 | Judgment method, judgment means and the terminal of multi-phase mixing uniformity |
| CN112669268A (en) * | 2020-12-21 | 2021-04-16 | 昆明理工大学 | Method, system and terminal for evaluating distribution uniformity of multiphase mixed concentration field |
| CN113144999A (en) * | 2021-04-15 | 2021-07-23 | 中联重科股份有限公司 | Method and system for detecting stirring uniformity of viscous substance and stirring control method |
| CN114166829A (en) * | 2021-12-08 | 2022-03-11 | 华中科技大学鄂州工业技术研究院 | Slurry uniformity detection system and method |
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| CN105910996A (en) * | 2016-04-07 | 2016-08-31 | 昆明理工大学 | Method for determining mixing time of multiphase flow by using RGB color model |
| CN106546591A (en) * | 2016-11-07 | 2017-03-29 | 首钢总公司 | A kind of detection method of sintering deposit uniformity |
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| CN108072740A (en) * | 2016-11-10 | 2018-05-25 | 内蒙古伊利实业集团股份有限公司 | A kind of assay method of the mixture homogeneity of dry mixed powder product |
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| CN109785342A (en) * | 2019-01-15 | 2019-05-21 | 昆明理工大学 | A kind of analysis method of the animal meat quality uniformity |
| CN109903243A (en) * | 2019-02-20 | 2019-06-18 | 云南农业大学 | A method of multiphase stirring and mixing effect is characterized based on Logistics model |
| CN110068575A (en) * | 2019-04-29 | 2019-07-30 | 嘉兴学院 | Judgment method, judgment means and the terminal of multi-phase mixing uniformity |
| CN112669268A (en) * | 2020-12-21 | 2021-04-16 | 昆明理工大学 | Method, system and terminal for evaluating distribution uniformity of multiphase mixed concentration field |
| CN113144999A (en) * | 2021-04-15 | 2021-07-23 | 中联重科股份有限公司 | Method and system for detecting stirring uniformity of viscous substance and stirring control method |
| CN114166829A (en) * | 2021-12-08 | 2022-03-11 | 华中科技大学鄂州工业技术研究院 | Slurry uniformity detection system and method |
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