Abstract: The HD type automatic microscope photometer can automatically measure the coke pore structure parameters. The number of measurement points is 100,000, and a sample is measured in about 20 minutes. The coke porosity, average coke pore diameter, average coke pore wall thickness, coke pore diameter distribution histogram, coke pore wall thickness distribution histogram, etc. are given. HD automatic microscope photometer can also automatically determine the percentage content, average diameter and particle size distribution, distribution histogram of 6 kinds of particles.
HD type automatic microscope photometer can also semi-automatically determine the percentage content of 10 components and their reflectivity.
For coal blending, the HD automatic microscope photometer provides a variety of methods to determine the coal blending ratio.
1. Upper and lower limit method of reflectance of vitrinite group
From the upper and lower limits of the reflectivity of each single coal vitrinite in the reflectance distribution diagram, the peak area of â€‹â€‹each single coal is calculated integrally to determine its percentage. This method is applicable to the case where the reflectance peaks of the single coals in the mixed coal have substantially no overlap, or the reflectance peak heights of the single coals are basically the same.
2. Peak stripping method
It is applicable to the case where the reflectance peaks of each single coal in the mixed coal overlap, and the mixed coal ratio is calculated by the integral of the stripping curve area.
3. The upper and lower limits of the reflectance of the vitrinite group combined with the curve stripping peak separation method
In order to overcome the use of the curve stripping method to calculate the mixed coal ratio, sometimes the single coal stripping curve distribution is wider, this method can be used.
HD type automatic microscope photometer can also give the average result of repeated measurement, including the reflectance distribution chart, so that the reported results are more reliable. This is particularly important for coals whose properties are on the border. For example, when the coal is repeatedly measured twice, the maximum reflectance of the vitrinite group is 0.880 and 0.920, and the standard deviation is 0.18 and 0.21, respectively. The measurement results are in line with national standards and are not out of tolerance. According to the first measurement result, the coal should be 1/3 coking coal, and it is a simple blended coal. According to the second measurement result, it should be fat coal and complex coal blend. For the results of the second non-outlier measurement, it is obviously best to give an average result to avoid the above contradiction.
In view of the increasing diversification of coal from coking enterprises, coal blending is inevitable. On the one hand, coking enterprises should keep good coal quality, and try to avoid buying mixed coal. Starting from reality, we must solve the problem of correct evaluation of coal blending quality in the presence of mixed coal and guide coking production. Blended coal is different from single coal, and it can not play the role of single coal of corresponding brand in coking production. Matching coal reflectance distribution map is to evaluate the quality of coal blending into the furnace in the presence of coal blending, and understanding the percentage of each single brand in the blending coal is the only method at present.
The data processing function of the HD type automatic microscope photometer can be synthesized from a single coal reflectance distribution map to match the coal reflectance distribution map, giving the percentage of each single coal in the coking coal blending according to the coal reflectance and the actual percentage , With the coal average reflectance, standard deviation and other information. With this function, coking coal blending can also be simulated, and coal blending into the furnace can be monitored to prevent mismatching and missed matching.
1. Introduction of auxiliary functions of HD automatic microscope photometer
HD type automatic microscope photometer also has many humanized auxiliary functions. For example, the measurement results can be imported into WORD and EXCAL for users to edit or further summarize, count and calculate in their favorite format. The measurement results can be published on the local area network for use by all subjects. You can listen to your favorite music while measuring the Internet. HD type automatic microscope photometer also provides online help, you can query questions in the operation through keywords, indexes, etc. The online help style is the same as WORD, EXCAL and other software. HD automatic microscope photometer also has system detection software, which can detect the failure of the hardware system and adjust the hardware system parameters.
Second, the error and assessment of HD type automatic microscope photometer
After the HD automatic microscope photometer was successfully developed, its precision, stability, reproducibility of measurement results, and discrimination ability were strictly evaluated.
1. Instrument zero point
When there is no light signal input, HD type full-automatic microscope photometer has extremely small dark current, which can be permanently eliminated by adjusting the offset of the data acquisition card, so that the result is always zero. Therefore, dark current does not occupy the range of data collection, and does not reduce the resolution of data collection.
2. Instrument linearity
The working curve made by the reflectance standard film ends in a straight line in the entire process range, indicating that the instrument has good linearity.
3. Instantaneous stability
In the entire range (0-100mv), after the reflectance standard film or coal sample light signal is converted into an electrical signal, the range of the collected voltage signal basically does not exceed 1mv. Gadolinium gallium garnet has a reflectance of 1.722 at 23 Â° C. If the corresponding voltage value is 60mv, the voltage changes by 1mv, and the reflectance changes by 0.028. Meet the requirements of national standards.
4. Long-term stability
After the reflectance standard film or coal sample light signal is converted into an electrical signal, the voltage signal reduction within 1 hour does not exceed 1mv, and the voltage signal reduction within 4 hours does not exceed 2mv.
5. Semi-automatic measurement error
Without moving the sample, semi-automatically measure 20 reflectance data at a certain point in the reflectance standard piece or coal sample, the maximum change of which does not exceed 0.03, and the standard deviation does not exceed 0.02.
6. Automatic measurement error
Without moving the sample, automatically measure 10000 reflectance data at a certain point in the reflectance standard piece or coal sample, and the standard deviation does not exceed 0.03.
7. Repeated automatic determination of coal sample results
Repeated measurement of the coal sample shows that the maximum average reflectance of the vitrinite group of the coal sample does not exceed 0.03, which is better than the result of the HY-4 microscope photometer between 0.02-0.05. The same coal sample was automatically measured at 20,000 points and 40,000 points, and the average reflectance of the vitrinite group differed by 0.012.
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