CN111879732A - Method for simply and quantitatively measuring vitrinite content in coal - Google Patents
Method for simply and quantitatively measuring vitrinite content in coal Download PDFInfo
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- CN111879732A CN111879732A CN202010828034.5A CN202010828034A CN111879732A CN 111879732 A CN111879732 A CN 111879732A CN 202010828034 A CN202010828034 A CN 202010828034A CN 111879732 A CN111879732 A CN 111879732A
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- 239000003245 coal Substances 0.000 title claims abstract description 86
- 239000004079 vitrinite Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000010561 standard procedure Methods 0.000 claims abstract description 16
- 238000002310 reflectometry Methods 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 7
- 238000004445 quantitative analysis Methods 0.000 claims description 3
- 230000010287 polarization Effects 0.000 claims description 2
- 238000012217 deletion Methods 0.000 claims 1
- 230000037430 deletion Effects 0.000 claims 1
- 238000004939 coking Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012289 standard assay Methods 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
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- Life Sciences & Earth Sciences (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a method for simply and quantitatively measuring the vitrinite content of coal, which comprises the steps of measuring single coal with different vitrinite contents by a high-power camera, and calculating vitrinite measurement points on an average single-frame photo according to the measurement points; the number of the specular component measurement points of the single-frame photo has a linear relation with the specular component content measured by a national standard method, and the specular component content of the measured single coal is further calculated according to the linear relation; the method has the advantages of high measurement speed and low requirement on the professional level of an analyst.
Description
Technical Field
The invention belongs to the technical field of a method for measuring vitrinite content of coal, and particularly relates to a method for simply and quantitatively measuring vitrinite content of coal.
Background
Coal rock analysis of coal quality of single coal generally requires the determination of reflectance distribution and average values and microscopic components. For the determination of the micro-components, according to the requirements of GB/T8899-2013 'method for determining the micro-components and minerals of coal', the pulverized coal polished section is placed under a reflecting polarizer during the measurement, the points of various micro-components and minerals are counted by a point counting method through the equal step length movement of an objective table, and then the proportional content of each component is calculated. The determination method has high requirements on the professional level of an analyst, the analyst is required to accurately identify each microscopic component, and if the coal sample needs to be subjected to coal rock reflectivity analysis, the light sheet needs to be observed again, so that time and labor are wasted. In addition, the point counting method cannot represent the area of vitrinite, and has certain defect property for accurately researching the coal quality of the coal. Therefore, the invention provides a method for simply comparing the vitrinite content of single coal.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a simple method for quantitatively measuring the vitrinite content of coal, which has high measuring speed and relatively low requirement on the professional level of an analyst.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a simple and convenient quantitative method for measuring the vitrinite content in the coal, measure the single coal with different vitrinite contents through the high power camera, according to measuring the number of points, calculate the vitrinite measuring number of points on the average single-frame photo; the number of the specular component measurement points of the single-frame photo has a linear relation with the specular component content measured by a national standard method, and the specular component content of the single coal to be measured is further calculated according to the linear relation.
Further, a method for simply and quantitatively measuring the vitrinite content in coal comprises the following steps:
1) preparing a pulverized coal polished section for measuring a coal sample, placing the pulverized coal polished section on a reflecting polarization microscope objective table, focusing, and correcting the center of an objective lens;
2) opening the image shooting software, setting relevant parameters, and shooting at fixed points by a camera according to a set route until all the polished sections finish shooting the photos;
3) all the pictures are checked and selected;
4) and opening a measuring program, and testing the coal rock reflectivity of the sample.
5) Calculating the number of the specular component measurement points of the average single-frame photo, and calculating the specular component content of the single coal according to a linear relation graph of the number of the specular component measurement points and the specular component content measured by a national standard method.
Further, the process of checking and deleting the photos in the step 3) refers to: and examining the definition of all the photos, deleting the unclear photos when the number of the unclear photos accounts for less than or equal to 3% of all the photos, and performing additional shooting when the number of the unclear photos accounts for more than 3% of all the photos.
Further, the linear relationship between the number of specular component measurement points of the single-frame photo and the specular component content measured by the national standard method is as follows: y = aX + b, wherein the parameter a ranges from 0.40 to 0.55; the range of parameter b is: 40-47; wherein Y refers to the content of the specular component determined by a national standard method, and X refers to the number of specular component measurement points in a single-frame photo.
Compared with the prior art, the invention has the following beneficial effects:
the method is fast and has low requirement on the professional level of an analyst. By utilizing the high-power camera technology, on the premise that the number of pictures is basically consistent according to different vitrinite contents of various coal types, the vitrinite measurement point number on each frame of picture can be calculated according to the measurement point number, and further the vitrinite component contents of different coal types can be quantitatively calculated.
Drawings
FIG. 1 is a linear relationship diagram of the number of specular colonies in a single-frame photograph and the specular colony content measured by the national standard method in the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of the present invention are described in detail below with reference to examples, but the scope of protection is not limited thereto.
A simple and convenient quantitative method for measuring the vitrinite content in the coal, measure the single coal with different vitrinite contents through the high power camera, according to measuring the number of points, calculate the vitrinite measuring number of points on the average single-frame photo; the number of the specular component measurement points of the single-frame photo has a linear relation with the specular component content measured by a national standard method, and the specular component content of the single coal to be measured is further calculated according to the linear relation. The linear relation between the number of the specular component measurement points of the single-frame photo and the specular component content measured by the national standard method is as follows: y = (0.40-0.55) X + (40-47), wherein Y refers to the content of the specular component determined by a national standard method, and X refers to the number of measured points of the specular component in a single-frame photo.
When the reflectivity of the coal rock is analyzed by an image method, firstly, the rapid automatic focusing of a stepping motor and an objective table is utilized, and when the stepping motor automatically moves the polished section in equal step length, the polished section of the coal rock is shot into a photo by a high-power camera. During measurement, the number of points and the occupied proportion of the measured specular quality group in the picture are synchronously obtained by processing the data of the specular quality group in each frame of picture. According to different vitrinite contents of each coal type, on the premise of approximately the same number of pictures, the vitrinite measurement point number on each frame of picture can be calculated according to the reflectivity measurement point number, and the vitrinite component content can be calculated.
In practical application, the linear relationship between the number of specular component measurement points of the single-frame photo and the specular component content measured by the national standard method is a range: formula Y = aX + b, parameter a ranging from 0.40 to 0.55; the range of parameter b is: 40-47. The preferred embodiment may select: y =0.5X +44.11, Y =0.40X +40, Y =0.55X +47, Y =0.40X +44, Y =0.40X +47, Y =0.55X +40, Y =0.55X + 45.
The specific implementation mode is as follows:
the following describes embodiments of the present invention in conjunction with the measurement process.
1. Standard assay procedure: refer to the standard GB/T8899-2013 requirement.
(1) And (3) dripping the flattened coal rock pulverized coal into immersion oil, placing the immersion oil on an objective table of a reflection polarizing microscope, focusing, and correcting the center of an objective lens to ensure that light rays are uniform and imaging is clear.
(2) Determining the step length of the object stage pushing ruler, setting the dot spacing according to 0.4mm, moving from the upper left corner of the polished section along a fixed direction according to a preset step length, identifying the microscopic components positioned below the intersection point of the cross hair, and counting the microscopic components into corresponding dot numbers.
(3) Invalid points do not need to be counted, after one line is finished, the invalid points move one step along a fixed line distance to the fixed direction, the counting of the next line is continued until the measuring points are fully distributed with the whole piece, and the number of the valid points is more than 500.
(4) And calculating the proportion of the statistical points of each component in the total effective points.
2. The measurement process of the number of specular points of the average single-frame image is as follows:
(1) and dripping immersion oil on the flattened coal rock pulverized coal polished section, placing the flattened coal rock pulverized coal polished section on an objective table of a reflection polarizing microscope, focusing, and correcting the center of an objective lens to ensure that light is uniform and imaging is clear.
(2) A standard file (standard sample) is copied and used for storing the picture of the light sheet to be measured and a standard substance picture, and information such as sample name, serial number and the like is written and then stored.
(3) And opening the image shooting software, setting relevant parameters including saturation, curvature, brightness and the like in the 'setting', and step length, space, scanning delay and the like in the 'scanning setting', manually focusing the sample, and moving the sample to the middle. Click on the 'scanning starting point' to adjust the focal length clearly. Then click on "auto scan" to appear in the previously set standard file, open, click on "start scan". The camera takes pictures at fixed points according to a set route, the clear condition of the pictures needs to be noticed in the shooting process, and if the pictures which are not clear continuously appear, the focal length needs to be manually adjusted to be clear. Until the whole slide is shot, about 625 pieces are shot for each single coal.
(4) And after shooting, checking all the photos, mainly checking the definition of all the photos, deleting the unclear photos when the number of the unclear photos accounts for less than or equal to 3% of all the photos, and performing additional shooting when the number of the unclear photos accounts for more than 3% of all the photos.
(5) Opening a measuring program, clicking a newly-built test in a reflectivity menu, filling in sample information and laboratory temperature, selecting a standard sample, inserting the standard sample into a standard file for storing the picture, calculating the gray scale of the standard sample according to the three standard substance pictures, and starting to process the image after the examination is successful. And after the processing is finished, clicking the histogram, and finishing the reflectivity test.
(6) According to the result of making reflectivity by single coal, the total number of the shot pictures and the total point number of the measured reflectivity are calculated, and the point number of each frame of average picture is calculated.
3. The results of the present invention are analyzed by table 1, table 2 and fig. 1.
The content of vitrinite components of several different coal types is analyzed by adopting a national standard method and an image method provided by the invention, and the test data are respectively shown in tables 1 and 2.
TABLE 1 national Standard test data
| Serial number | Coal kind | Number of specular colonies | Number of non-specular colonies | Total effective point | Vitrinite content (%) |
| 1 | Gas coal 1 | 259 | 252 | 511 | 50.7 |
| 2 | Gas coal 2 | 308 | 230 | 538 | 57.2 |
| 3 | 1/3 coking coal | 319 | 201 | 520 | 61.3 |
| 4 | Fat coal 1 | 383 | 131 | 514 | 74.5 |
| 5 | Fat coal 2 | 368 | 138 | 506 | 72.7 |
| 6 | Coking coal 1 | 326 | 196 | 522 | 62.5 |
| 7 | Coking coal 2 | 343 | 171 | 514 | 66.7 |
| 8 | Coking coal III | 304 | 214 | 518 | 58.7 |
| 9 | Lean coal 1 | 287 | 239 | 526 | 54.6 |
| 10 | Lean coal 2 | 310 | 223 | 533 | 58.2 |
| 11 | Lean coal | 167 | 342 | 509 | 32.8 |
TABLE 2 graphic method test data
| Serial number | Coal kind | Number of photographs | Total number of specular component | Number of specular dots for a single photo |
| 1 | Gas coal 1 | 620 | 9300 | 15.0 |
| 2 | Gas coal 2 | 625 | 13963 | 22.3 |
| 3 | 1/3 coking coal | 624 | 20270 | 32.5 |
| 4 | Fat coal 1 | 612 | 35889 | 58.6 |
| 5 | Fat coal 2 | 616 | 34781 | 56.5 |
| 6 | Coking coal 1 | 645 | 26518 | 41.1 |
| 7 | Coking coal 2 | 617 | 28485 | 46.2 |
| 8 | Coking coal III | 595 | 21448 | 36.1 |
| 9 | Lean coal 1 | 613 | 12802 | 20.9 |
| 10 | Lean coal 2 | 625 | 16184 | 25.9 |
| 11 | Lean coal | 611 | 8574 | 14.1 |
The graph obtained from tables 1 and 2 is shown in fig. 1 by the image method proposed by the present invention.
Through data fitting, the linear relation between the content of the specular component measured by national standard and the number of specular component points in a single photo measured by the method is as follows: y =0.5X +44.11, wherein Y refers to the content of the specular colonies measured by the national standard method, and X refers to the number of specular colonies in a single picture measured by the method.
In the subsequent vitrinite content analysis process, the vitrinite content of the single coal can be directly corresponding through the formula without secondary identification.
The method for measuring the vitrinite content in the coal utilizes the high power camera technology, calculates the vitrinite measurement point number on each frame of picture according to the measurement point number according to different vitrinite contents of various coal types, and further obtains the vitrinite content of the single coal according to a relational graph of the point number and the vitrinite content measured by national standard.
According to the method, the coal rock reflectivity and the vitrinite component content of the coal can be analyzed simultaneously only by scanning the coal sample image once, and the method is relatively more efficient. Meanwhile, the professional requirements on personnel are reduced, and the use is more convenient.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A simple and convenient quantitative method for measuring the vitrinite content in the coal, characterized by, measure the single coal with different vitrinite content through the high power camera, according to measuring the number of points, calculate the vitrinite measuring point number on the average single-frame photo; the number of the specular component measurement points of the single-frame photo has a linear relation with the specular component content measured by a national standard method, and the specular component content of the single coal to be measured is further obtained according to the linear relation.
2. The method for conveniently and quantitatively measuring the vitrinite content in the coal as claimed in claim 1, which comprises the following steps:
1) preparing a pulverized coal polished section for measuring a coal sample, placing the pulverized coal polished section on a reflecting polarization microscope objective table, focusing, and correcting the center of an objective lens;
2) opening the image shooting software, setting relevant parameters, and shooting at fixed points by a camera according to a set route until all the polished sections finish shooting the photos;
3) all the pictures are checked and selected;
4) opening a measuring program, and testing the coal rock reflectivity of the sample;
5) and calculating the number of the specular component measurement points of the average single-frame photo, and obtaining the specular component content of the single coal according to a linear relation graph of the number of the specular component measurement points and the specular component content measured by a national standard method.
3. The method for conveniently and quantitatively measuring the vitrinite content in the coal as claimed in claim 2, wherein the examination and deletion process of the photos in the step 3) is: and examining the definition of all the photos, deleting the unclear photos when the number of the unclear photos accounts for less than or equal to 3% of all the photos, and performing additional shooting when the number of the unclear photos accounts for more than 3% of all the photos.
4. The method for conveniently and quantitatively measuring the vitrinite content in the coal as claimed in claim 1 or 2, wherein the linear relation between the number of vitrinite measurement points of the single-frame photo and the vitrinite content measured by the national standard method is as follows: y = aX + b, wherein the parameter a ranges from 0.40 to 0.55; the range of parameter b is: 40-47; wherein Y refers to the content of the specular component determined by a national standard method, and X refers to the number of specular component measurement points in a single-frame photo.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486891A (en) * | 2022-01-19 | 2022-05-13 | 酒泉钢铁(集团)有限责任公司 | Method for rapidly judging proportion of semi-coke doped in anthracite |
| WO2023054065A1 (en) * | 2021-09-30 | 2023-04-06 | Ｊｆｅスチール株式会社 | Coal analyzer, coal analysis method, mixed coal preparation method, and coke production method |
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| CN102297850A (en) * | 2010-06-22 | 2011-12-28 | 宝山钢铁股份有限公司 | Digital automatic coal rock component measuring method |
| CN102928340A (en) * | 2012-10-19 | 2013-02-13 | 煤炭科学研究总院 | Image analysis-based method and special equipment for simultaneously determining content of maceral and vitrinite reflectance of coal |
| CN104090084A (en) * | 2014-06-27 | 2014-10-08 | 江苏省沙钢钢铁研究院有限公司 | Prediction method matched with coal blend vitrinite reflectance distribution and application of predication method |
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| CN102297850A (en) * | 2010-06-22 | 2011-12-28 | 宝山钢铁股份有限公司 | Digital automatic coal rock component measuring method |
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| CN104090084A (en) * | 2014-06-27 | 2014-10-08 | 江苏省沙钢钢铁研究院有限公司 | Prediction method matched with coal blend vitrinite reflectance distribution and application of predication method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023054065A1 (en) * | 2021-09-30 | 2023-04-06 | Ｊｆｅスチール株式会社 | Coal analyzer, coal analysis method, mixed coal preparation method, and coke production method |
| JP7405303B2 (en) | 2021-09-30 | 2023-12-26 | Ｊｆｅスチール株式会社 | Coal analyzer, coal analysis method, mixed coal preparation method, and coke manufacturing method |
| CN114486891A (en) * | 2022-01-19 | 2022-05-13 | 酒泉钢铁(集团)有限责任公司 | Method for rapidly judging proportion of semi-coke doped in anthracite |
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