Device for measuring internal structure of coke and measuring method thereof

Abstract

The invention provides a device for measuring an internal structure of coke and a measuring method thereof; the device comprises a microscope and a computer; the computer is used for controlling rotation of a polarizer of the microscope and front, rear, left, right, upper and lower three-dimensional moving of an object stage. The measuring method comprises the following steps: pretreating a to-be-tested sample for standby application; establishing the relationship between pixel values of a digital image of a substance and the reflectivity; shooting digital images for analysis of sample bireflectivity and optical anisotropic indexes; determining an effective point classification statistical rule; and analyzing an optical structure of the coke by the statistical rule. The device and the method have the advantages that compared with an image analysis method purely relying on gray and shape characteristics, the method adopts three parameters of the maximum reflectivity, the bireflectivity and the optical anisotropic indexes for identification and analysis of the optical structure, and the measured results are more accurate and more reliable; and the whole analysis process is fully automatic, and the method is a fast and efficient analysis method.

Description

technical field

[0001] The invention relates to a device for measuring the internal structure of coke and a measuring method thereof, belonging to the technical field of iron and steel metallurgy. Background technique

[0002] Coke is a porous body composed of pores, pore walls and microcracks. The pore wall of coke is mainly composed of carbonaceous materials. The form of carbon in coke is between amorphous carbon and graphitic carbon. Under the reflective polarizing microscope, it can be observed that the pore wall of coke has different structures and shapes, and the size of the area is different. Composed of color units, these isochromatic units are called optical microscopic components of coke. The optical structure of coke is not only related to the characteristics of the raw coal used in coking, but also reflects some changes in the coking process. At the same time, there is also a close relationship between the optical structure of coke and the macroscopic propertie...

Examples

Embodiment 1

[0049] This embodiment relates to the structure of an automatic measurement and analysis system such as figure 1 As shown, it consists of an automatically controlled optical microscope and a digital image analysis system. When working, the computer 8 controls the polarizer 2 to rotate at a certain angle through the transmission system, thereby converting the natural light incident from the light source 1 into polarized light of different angles. The computer 8 also controls the three-dimensional movement of the stage 3 forward and backward, left and right, and up and down through a series of transmission systems, so as to realize the scanning observation of the surface of the sample 4 to be tested and the automatic focus function when taking pictures. In addition, the microscopic image magnified by the microscope objective lens 5 can not only be photographed by the camera 7 , but also can be directly viewed with the naked eye from the eyepiece 6 .

Embodiment 2

[0051] The present embodiment relates to the automatic measurement and analysis method based on the system of embodiment 1, comprising the following steps:

[0052] 1. After crushing the metallurgical coke, take 4-5g of fine particles with a particle size of 0.071-1mm, and cast them into flakes with a diameter of 22mm with epoxy resin or other cements. The surface of the sample should be polished to meet the requirements of microscope observation. sample light sheet;

[0053] 2. Use a digital camera to shoot 3 to 4 standard substances with known reflectance under single polarized light, and obtain the corresponding relationship between the pixel value of the digital image and the reflectivity. According to the corresponding relationship, the sample to be tested can be measured The absolute value of the reflectance, such as figure 2 shown;

[0054] 3. Place the sample to be tested on the microscope stage and start shooting. Before shooting, set the step length and number of...

Embodiment 3

[0059] Get a certain metallurgical coke powder sample 4g ​​with a particle size less than 1mm, make a light sheet sample with a diameter of 22mm with epoxy resin, and adopt the measurement results of the analytical method in Example 2 as shown in Table 1 and Figure 6-17 Shown:

[0060] Table 1 Automatic analysis results of coke optical structure

[0061] Microcomponent category Proportion(%) Isotropic 49.4 mosaic 23.6

[0062] fibrous 18.0 flaky 7.5 other 1.5

technical field

[0001] The invention relates to a device for measuring the internal structure of coke and a measuring method thereof, belonging to the technical field of iron and steel metallurgy. Background technique

[0002] Coke is a porous body composed of pores, pore walls and microcracks. The pore wall of coke is mainly composed of carbonaceous materials. The form of carbon in coke is between amorphous carbon and graphitic carbon. Under the reflective polarizing microscope, it can be observed that the pore wall of coke has different structures and shapes, and the size of the area is different. Composed of color units, these isochromatic units are called optical microscopic components of coke. The optical structure of coke is not only related to the characteristics of the raw coal used in coking, but also reflects some changes in the coking process. At the same time, there is also a close relationship between the optical structure of coke and the macroscopic propertie...

Examples

Embodiment 1

[0049] This embodiment relates to the structure of an automatic measurement and analysis system such as figure 1 As shown, it consists of an automatically controlled optical microscope and a digital image analysis system. When working, the computer 8 controls the polarizer 2 to rotate at a certain angle through the transmission system, thereby converting the natural light incident from the light source 1 into polarized light of different angles. The computer 8 also controls the three-dimensional movement of the stage 3 forward and backward, left and right, and up and down through a series of transmission systems, so as to realize the scanning observation of the surface of the sample 4 to be tested and the automatic focus function when taking pictures. In addition, the microscopic image magnified by the microscope objective lens 5 can not only be photographed by the camera 7 , but also can be directly viewed with the naked eye from the eyepiece 6 .

Embodiment 2

[0051] The present embodiment relates to the automatic measurement and analysis method based on the system of embodiment 1, comprising the following steps:

[0052] 1. After crushing the metallurgical coke, take 4-5g of fine particles with a particle size of 0.071-1mm, and cast them into flakes with a diameter of 22mm with epoxy resin or other cements. The surface of the sample should be polished to meet the requirements of microscope observation. sample light sheet;

[0053] 2. Use a digital camera to shoot 3 to 4 standard substances with known reflectance under single polarized light, and obtain the corresponding relationship between the pixel value of the digital image and the reflectivity. According to the corresponding relationship, the sample to be tested can be measured The absolute value of the reflectance, such as figure 2 shown;

[0054] 3. Place the sample to be tested on the microscope stage and start shooting. Before shooting, set the step length and number of...

Embodiment 3

[0059] Get a certain metallurgical coke powder sample 4g ​​with a particle size less than 1mm, make a light sheet sample with a diameter of 22mm with epoxy resin, and adopt the measurement results of the analytical method in Example 2 as shown in Table 1 and Figure 6-17 Shown:

[0060] Table 1 Automatic analysis results of coke optical structure

[0061] Microcomponent category Proportion(%) Isotropic 49.4 mosaic 23.6

[0062] fibrous 18.0 flaky 7.5 other 1.5

Images