Coal analysis
Thread Content
I’m seeking help from netizens on Haichuan. I work in coal analysis; yesterday a friend brought me a prepared coal sample. While conducting the normal analyses to determine the moisture content and volatile matter, the balance reading changed with each measurement – there was a change in the third decimal place, and generally the change was in the order of two digits. After the coal is burned, there is little change, with a variation in the single digits? My balance is normal and has been calibrated. I weighed the samples of coal I used to work with, and they were normal as well. May I ask the group members what kind of coal this is? Is there a good way to weigh it?
This has no direct relation to what kind of coal it is! The issue is likely that the conditions under which the coal sample was prepared may differ from yours, and another factor is probably the high humidity in your environment! The weighing speed must be fast! Personally, I don’t think it’s necessary to change the weighing method!
Thank you! I took the coal samples I had worked on before and weighed them, and this phenomenon did not occur. I also changed to another balance scale, and the same problem occurred. What is this problem?
Since it is a coal sample, at room temperature, only the evaporation or absorption of moisture has a significant impact on its weight!
I took the coal samples I had worked on before and weighed them, and this phenomenon did not occur.
Hello! My geographical coordinates are in Liangshan Prefecture, «right near the Muli fire area»; the environment there is very dry. The weighing speed is normal; it’s done the same way as before. What I don’t quite understand is that with the coal samples I worked on before, this phenomenon didn’t occur when they were weighed. I also changed to another balance scale, and the same problem occurred. I wonder if it’s because of coal? Have others in the same field encountered such a problem?
After completing the analysis, compare it with the various indicators of the coal from before to see where the differences are largest.
I’m sorry, the sample I analyzed is an external sample, so it’s not possible to make a comparison. :(
Regardless of the sample, it has component contents as well as properties and structure; only through comparative analysis can the differences between them be identified.