CN113514375A - Method for measuring mixing efficiency of solid mixer - Google Patents
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- CN113514375A CN113514375A CN202110262075.7A CN202110262075A CN113514375A CN 113514375 A CN113514375 A CN 113514375A CN 202110262075 A CN202110262075 A CN 202110262075A CN 113514375 A CN113514375 A CN 113514375A
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- 239000007787 solid Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000012216 screening Methods 0.000 claims abstract description 36
- 238000005070 sampling Methods 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 3
- 235000019580 granularity Nutrition 0.000 description 18
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229960000907 methylthioninium chloride Drugs 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0003—Composite materials
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Abstract
The invention particularly relates to a method for measuring the mixing efficiency of a solid mixer, which belongs to the technical field of measuring the mixing efficiency and comprises the following steps: obtaining a solid mixer to be detected; sampling at the outlet of the solid mixer to be detected to obtain a plurality of samples to be detected; respectively carrying out moisture test on a plurality of samples to be tested to obtain moisture variation coefficients; respectively drying a plurality of samples to be tested and testing the screening granularity to obtain the screening granularity variation coefficient; respectively carrying out chemical component test on a plurality of samples to be tested to obtain chemical component variation coefficients; obtaining the efficiency variation coefficient of the solid mixer to be measured according to the water variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient; obtaining the mixing efficiency of the solid mixer to be tested according to the efficiency variation coefficient of the solid mixer to be tested; the comprehensive measurement of the mixing efficiency of the mixer provides a method for judging the mixing efficiency of the solid mixer and provides a reference for the selection of the mixer.
Description
Technical Field
The invention belongs to the technical field of measuring the mixing efficiency of a mixing machine, and particularly relates to a method for measuring the mixing efficiency of a solid mixing machine.
Background
The mixer is a mechanical device for uniformly mixing two or more materials by using mechanical force, gravity and the like. The mixing of powder is a key operation unit for a process using various materials, and the mixing efficiency of a mixer determines the quality and stability of a product. For solid mixers, the type, configuration, paddles, etc. of the mixer all have a significant effect on the mixing efficiency of the mixer. The current methods for measuring the mixing efficiency include: the mixing efficiency was analyzed using a tracer such as methylene blue and the analysis using a fluorescent agent.
Disclosure of Invention
In view of the above problems, the present invention has been developed to provide a method of measuring the mixing efficiency of a solids mixer that overcomes, or at least partially solves, the above problems.
The embodiment of the invention provides a method for measuring mixing efficiency of a solid mixer, which comprises the following steps:
obtaining a solid mixer to be detected;
sampling at the outlet of the solid mixer to be tested to obtain a plurality of samples to be tested;
respectively carrying out moisture test on a plurality of samples to be tested to obtain moisture variation coefficients;
respectively drying a plurality of samples to be tested and testing the screening granularity to obtain the screening granularity variation coefficient;
respectively carrying out chemical component test on a plurality of samples to be tested to obtain chemical component variation coefficients;
obtaining the efficiency variation coefficient of the solid mixer to be tested according to the water variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient;
and obtaining the mixing efficiency of the solid mixer to be tested according to the efficiency variation coefficient of the solid mixer to be tested.
Optionally, the solid mixer to be tested is a continuous mixer or a batch mixer.
Optionally, when the solid mixer to be tested is a continuous mixer, the sampling mode is continuous sampling; when the solid mixer to be detected is a batch mixer, the sampling mode is random sampling.
Optionally, in the sampling at the outlet of the solid mixer to be tested, the sampling frequency is 10-100 times.
Optionally, in the step of drying and measuring the screening particle size of the samples to be measured, the drying temperature is 100 ℃ to 110 ℃, and the drying time is 1.5h to 2.5 h.
Optionally, in the step of drying and measuring the screening particle size of the plurality of samples to be measured, at least 2 screens are selected for screening particle size.
Optionally, the obtaining of the sieving particle size variation coefficient specifically includes:
calculating the average value and the standard deviation of each screening granularity of a plurality of samples to be detected to obtain the variation coefficient of each screening granularity;
and taking the sum of the weighted variation coefficients of all the screened particle sizes to obtain the screened particle size variation coefficient.
Optionally, in the step of respectively performing chemical component tests on a plurality of samples to be tested, at least 2 components are measured.
Optionally, the obtaining the coefficient of variation of the chemical composition specifically includes:
calculating the average value and the standard deviation of each component in a plurality of samples to be detected to obtain the variation coefficient of each component;
and taking the average value of the coefficient of variation of each component to obtain the coefficient of variation of the chemical components.
Optionally, obtaining the efficiency variation coefficient of the solid mixer to be tested according to the moisture variation coefficient, the screening particle size variation coefficient and the chemical component variation coefficient; the efficiency variation coefficient of the solid mixer to be detected is the average value of the water variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for measuring the mixing efficiency of the solid mixer provided by the embodiment of the invention comprises the following steps: obtaining a solid mixer to be detected; sampling at the outlet of the solid mixer to be detected to obtain a plurality of samples to be detected; respectively carrying out moisture test on a plurality of samples to be tested to obtain moisture variation coefficients; respectively drying a plurality of samples to be tested and testing the screening granularity to obtain the screening granularity variation coefficient; respectively carrying out chemical component test on a plurality of samples to be tested to obtain chemical component variation coefficients; obtaining the efficiency variation coefficient of the solid mixer to be measured according to the water variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient; obtaining the mixing efficiency of the solid mixer to be tested according to the efficiency variation coefficient of the solid mixer to be tested; by comprehensively measuring the mixing efficiency of the mixer, a method can be provided for judging the mixing efficiency of the solid mixer, the influence of different mixers, mixing accessories and the like on the mixing efficiency can be considered, and a reference can be provided for the selection of the mixer.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
fig. 2 is a block diagram of a testing process provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The current methods for measuring the mixing efficiency include: analysis of mixing efficiency using a tracer such as methylene blue and analysis using a fluorescent agent, the present application is intended to provide a novel method of measuring mixing efficiency. According to an exemplary embodiment of the present invention, there is provided a method of measuring mixing efficiency of a solids mixer, the method comprising:
s1, obtaining a solid mixer to be detected; in this embodiment, the solid mixer to be measured is a continuous mixer or a batch mixer;
s2, sampling at an outlet of the solid mixer to be tested to obtain a plurality of samples to be tested; when the solid mixer to be tested is a continuous mixer, the sampling mode is continuous sampling, the sampling time intervals are required to be the same, and for the continuous mixers with different sizes and different material residence times, the sampling time intervals can be 30s-10 min; when the solid mixer to be tested is a batch mixer, the sampling mode is random sampling, wherein the sampling frequency is 10-100 times,
s3, respectively carrying out moisture test on a plurality of samples to be tested to obtain moisture variation coefficients; it should be noted that: for the continuous mixer, sampling is carried out at intervals at the outlet of the mixer, the sample bags are sealed, and then the moisture content of the samples is measured by a moisture meter; certainly, if the time from sampling to moisture testing is short, sealing is not needed, in short, the principle is to avoid the loss of moisture of the sample to be tested, and further avoid influencing the accuracy of the testing result;
s4, respectively drying the samples to be tested and testing the screening granularity to obtain the screening granularity variation coefficient; specifically, the method comprises the following steps:
s4.1, calculating the average value and the standard deviation of each screening granularity of a plurality of samples to be tested to obtain the variation coefficient of each screening granularity;
s4.2, taking the sum of the weighted variation coefficients of all the screening granularities (the ratio of the variation coefficient to the screening granularity) to obtain the screening granularity variation coefficient;
s5, respectively carrying out chemical component test on a plurality of samples to be tested to obtain chemical component variation coefficients; specifically, the method comprises the following steps:
s5.1, calculating the average value and the standard deviation of each component in the plurality of samples to be detected to obtain the variation coefficient of each component;
s5.2, taking the average value of the variation coefficients of all the components to obtain the variation coefficient of the chemical component;
s6, obtaining the efficiency variation coefficient of the solid mixer to be tested according to the moisture variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient; the efficiency variation coefficient of the solid mixer to be measured is the average value of the water variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient;
and S7, obtaining the mixing efficiency of the solid mixer to be tested according to the efficiency variation coefficient of the solid mixer to be tested.
As an optional implementation mode, in the step of drying and measuring the screening particle size of a plurality of samples to be measured, the drying temperature is 100-110 ℃, and the drying time is 1.5-2.5 h.
The reason why the drying temperature is controlled to be 100 ℃ to 110 ℃ is that (higher than 100 ℃ is to ensure complete evaporation of water, and lower than 110 ℃ is to prevent other components from thermal decomposition to affect the test result).
The reason why the drying time is controlled to be 1.5h-2.5h is that the applicant finds that two hours of drying time can ensure complete drying of water, and the final purpose of drying is to require constant weight, but two hours is generally considered to be satisfactory.
It should be noted that the mixture ratio of the materials fed into the mixer needs to be kept constant during the whole test process.
For a continuous mixer, on the premise that the raw material ratio is unchanged, sampling is carried out at the outlet of the mixer at intervals, sample bags are sealed, sampling is carried out for 10-100 times continuously and numbering is carried out, then a moisture meter is used for measuring the moisture content of the sample, the sample is dried for two hours at 105 ℃, then particle size screening measurement is carried out, the sample is prepared and component detection is carried out, the moisture, the particle size and the component are respectively calculated into an average value and a standard deviation, wherein the percentage of the standard deviation and the average value is a variation coefficient, and the average values of the variation coefficients of the moisture, the sum of weighted variation coefficients of different particle sizes and the average value of the variation coefficients of different components are taken as the variation coefficient of the mixer;
for a batch mixer, 10-100 samples can be randomly selected and sealed after raw materials are mixed, then a moisture meter is used for measuring the moisture content of the samples, the samples are dried for two hours at 105 ℃ and then subjected to particle size screening measurement, the samples are prepared and subjected to component detection, the average value and the standard deviation of the moisture, the particle size and the components are respectively calculated, wherein the percentage of the standard deviation and the average value is the coefficient of variation, and the average values of the coefficient of variation of the moisture, the sum of the weighted coefficients of variation of different particle sizes and the average value of the coefficient of variation of different components are taken as the coefficient of variation of the mixing efficiency of the mixer.
The method for measuring the mixing efficiency of the solid mixer of the present application will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
The continuous horizontal mixer used in a pelletizing plant of a certain iron and steel enterprise is used as a research object in the embodiment, and specifically comprises the following steps:
(1) continuously sampling 20 times every one minute at the outlet of the mixer and sealing;
(2) measuring the moisture of the mineral powder by using a moisture meter, and sequentially calculating an average value, a standard deviation and a variation coefficient, which are shown in the table;
| numbering | Moisture content |
| 1 | 8.50％ |
| 2 | 8.40％ |
| 3 | 8.30％ |
| 4 | 8.20％ |
| 5 | 8.20％ |
| 6 | 8.17％ |
| 7 | 8.16％ |
| 8 | 8.25％ |
| 9 | 8.07％ |
| 10 | 8.22％ |
| 11 | 8.31％ |
| 12 | 8.09％ |
| 13 | 8.22％ |
| 14 | 8.12％ |
| 15 | 8.33％ |
| 16 | 8.27％ |
| 17 | 8.27％ |
| 18 | 8.16％ |
| 19 | 8.27％ |
| 20 | 8.11％ |
| Mean value of | 8.23％ |
| Standard deviation of | 0.11％ |
| Coefficient of variation | 1.29％ |
(3) Drying the sample in a drying oven at 105 ℃, measuring the screened particle size of the sample by using sieves of 80 meshes, 100 meshes, 120 meshes, 140 meshes, 160 meshes, 180 meshes and 200 meshes, calculating the percentage of the sample in each particle size range, respectively calculating the average value, standard deviation and variation coefficient of each particle size range, and taking the sum of weighted variation coefficients of all particle size ranges as the variation coefficient of the particle size, wherein the specific table is shown below;
(4) measuring chemical components of the sample, wherein SiO is selected as the sample of iron ore powder2Taking CaO as a main component, calculating the average value, standard deviation and variation coefficient of each component, and taking the average value of the variation coefficients of all the components as the variation coefficient of the components, wherein the specific table is shown in the following table;
| numbering | SiO2(％) | CaO(％) |
| 1 | 2.15 | 2.21 |
| 2 | 2.11 | 2.15 |
| 3 | 2.08 | 2.13 |
| 4 | 2.13 | 2.25 |
| 5 | 2.17 | 2.23 |
| 6 | 2.25 | 2.28 |
| 7 | 2.23 | 2.25 |
| 8 | 2.28 | 2.37 |
| 9 | 2.31 | 2.32 |
| 10 | 2.03 | 2.15 |
| 11 | 2.08 | 2.17 |
| 12 | 2.15 | 2.15 |
| 13 | 2.17 | 2.31 |
| 14 | 2.16 | 2.26 |
| 15 | 2.11 | 2.22 |
| 16 | 2.28 | 2.31 |
| 17 | 2.16 | 2.31 |
| 18 | 2.18 | 2.2 |
| 19 | 2.13 | 2.15 |
| 20 | 2.15 | 2.17 |
| Mean value of | 2.17 | 2.23 |
| Standard deviation of | 0.07 | 0.07 |
| Coefficient of variation | 3.37％ | 3.18％ |
(5) The average of the coefficients of variation of moisture, particle size and composition was taken as the coefficient of variation of the mixing efficiency of the mixer.
The coefficient of variation of water is 1.29%, the coefficient of variation of particle size is 3.69%, and the coefficient of variation of ingredients is 3.27%, so the average value of the coefficient of variation of mixing efficiency of the mixer is 2.75%.
(6) The mixing efficiency of the mixer is obtained through the variation coefficient of the mixing efficiency of the mixer.
The mixer mixing efficiency was (1-2.75%), i.e. 97.25%.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) the embodiment of the invention provides a new method for measuring the mixing efficiency of a mixer;
(2) the embodiment of the invention can provide a method for judging the mixing efficiency of the solid mixer by comprehensively measuring the mixing efficiency of the mixer;
(3) by adopting the method for measuring the mixing efficiency of the mixer provided by the embodiment of the invention, the influence of different mixers, mixing accessories and the like on the mixing efficiency is considered, and reference can be provided for the selection of the mixer.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of measuring mixing efficiency of a solids mixer, the method comprising:
obtaining a solid mixer to be detected;
sampling at the outlet of the solid mixer to be tested to obtain a plurality of samples to be tested;
respectively carrying out moisture test on a plurality of samples to be tested to obtain moisture variation coefficients;
respectively drying a plurality of samples to be tested and testing the screening granularity to obtain the screening granularity variation coefficient;
respectively carrying out chemical component test on a plurality of samples to be tested to obtain chemical component variation coefficients;
obtaining the efficiency variation coefficient of the solid mixer to be tested according to the water variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient;
and obtaining the mixing efficiency of the solid mixer to be tested according to the efficiency variation coefficient of the solid mixer to be tested.
2. The method of measuring mixing efficiency of a solid mixer of claim 1, wherein the solid mixer to be tested is a continuous mixer or a batch mixer.
3. The method of measuring mixing efficiency of a solids mixer of claim 2, wherein when the solids mixer to be tested is a continuous mixer, the sampling is by continuous sampling; when the solid mixer to be detected is a batch mixer, the sampling mode is random sampling.
4. The method for measuring mixing efficiency of a solid mixer according to claim 1, wherein the sampling is performed at the outlet of the solid mixer to be tested, and the sampling time is 10 times to 100 times.
5. The method for measuring mixing efficiency of a solid mixer according to claim 1, wherein in the step of drying the samples to be measured and measuring the screened particle sizes, the drying temperature is 100 ℃ to 110 ℃, and the drying time is 1.5h to 2.5 h.
6. The method of measuring mixing efficiency in a solids mixer of claim 1, wherein at least 2 screens are selected for screening out the samples to be tested by drying and measuring the screening out size.
7. The method of measuring mixing efficiency of a solids mixer of claim 1, wherein obtaining a coefficient of variation of a sieve particle size comprises:
calculating the average value and the standard deviation of each screening granularity of a plurality of samples to be detected to obtain the variation coefficient of each screening granularity;
and taking the sum of the weighted variation coefficients of all the screened particle sizes to obtain the screened particle size variation coefficient.
8. The method for measuring mixing efficiency of a solid mixer of claim 1, wherein at least 2 components are measured in each of the plurality of samples under test in the chemical composition test.
9. The method of measuring mixing efficiency of a solids mixer of claim 1, wherein obtaining the coefficient of variation of the chemical composition comprises:
calculating the average value and the standard deviation of each component in a plurality of samples to be detected to obtain the variation coefficient of each component;
and taking the average value of the coefficient of variation of each component to obtain the coefficient of variation of the chemical components.
10. The method for measuring mixing efficiency of a solid mixer according to claim 1, wherein the coefficient of variation of the efficiency of the solid mixer to be measured is obtained according to the coefficient of variation of moisture, the coefficient of variation of the sieving particle size and the coefficient of variation of the chemical composition; the efficiency variation coefficient of the solid mixer to be detected is the average value of the water variation coefficient, the screening granularity variation coefficient and the chemical component variation coefficient.
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2021
- 2021-03-10 CN CN202110262075.7A patent/CN113514375A/en active Pending
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| US20040040173A1 (en) * | 2000-05-25 | 2004-03-04 | Kruithof Arjen Johannes | Method for drying finely divided substances |
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