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Today, our company experimented with a 6-meter-long coal pellet during the compaction process. Unfortunately, it collapsed as soon as it was pushed out. Analyzing the reasons, I believe the following points are relevant: First, the moisture content of the coal pellet was controlled at 12.4% (according to data from the Quality Management Department), which is basically appropriate. Second, the atmospheric temperature was low; the average temperature today was -5 degrees, with wind speeds of level 3 to 4. In such low temperatures, the pulverized coal particles tend to freeze, causing the surrounding particles to clump together into larger coal grains. During the compaction process, the loss of moisture reduces the cohesion between the coal particles, meaning their viscosity decreases (the intermolecular forces weaken). Of course, low temperatures also have a “positive effect” on the cohesion of the coal material – the coal pellet used in the experiment on the 19th didn’t collapse at all, as it was completely frozen^-^ :lol; it was so solid that it couldn’t even be damaged when held horizontally. Third, the low temperatures caused the coal particles located near the compaction box to freeze, which increased the friction between the coal pellet and the side walls of the compaction box. This led to the coal pellet sticking to those walls, thereby increasing the likelihood of it collapsing during the loading process. This post was last edited by dmz329227 on 2009-2-24 21:20