How to verify the accuracy of coal blending?
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This post was last edited by Desert Poplar on 2011-2-27 22:09. Can ash be used to check the accuracy of coal blending? Are there any other good methods?
An automatic coal blending system is used, which features hyperbolic funnels and disk feeders, as well as alarms for low and high material levels; this ensures a high degree of accuracy in coal blending, meeting the production requirements.
Weighing is the best – fast, accurate, and practical.
Only then can coal be fed onto the belt scale using a single type of coal, and the accuracy of the belt scale is regularly checked
Compare the actual value of the blended coal with its theoretical weighted value, and refer to the standard deviation.
The accuracy of coal blending can be determined based on the volatile matter content; that is, the volatile matter content of each individual coal batch is measured, and a weighted calculation is used to determine the theoretical volatile matter content of the blended coal. This value is then compared with the actual volatile matter content of the blended coal. Ash and sulfur content can also be used for comparison
Check whether the coal blending in each bin is accurate; the nuclear scale is verified through wheel rotation tests, and the electronic scale is calibrated. Calibration can be further divided into physical calibration or weight calibration. To verify the accuracy of overall coal blending, there are mainly three concepts: actual value, weighted value, and theoretical value. The actual value refers to the parameters of the actual blended coal. The weighted value is the blended coal index obtained by using the coal quality parameters from the test reports and applying weighting based on specific ratios. The theoretical value is the indicator used during proportioning. The accuracy of coal blending is determined by comparing the differences in volatile matter and ash content between the actual values and the weighted values. The industry standard for coking is a volatility of plus or minus 0.7% and an ash content of plus or minus 0.3%. If the deviation between the actual value and the weighted value is within this range, and yet the difference between the actual value and the theoretical value is significant, it indicates that the values assigned to each type of coal during the proportioning process were not appropriate.
1 refers to the accuracy of the electronic scale; 2 refers to the difference between the theoretical value of volatiles and the actual value, which is generally around 0.1%