It’s interesting to note how much the grain silos changed the shape of the blast. The damage behind the silos is almost immediately reduced, even in this set of images.
Grain silos are actually built to withstand explosions. I am not an expert but I was explained as a kid that stored grain can create static electricity discharges that can result in self-ignition.
Wow, after reading your comment I started digging a bit and found this video from 2014. Those small explosions in the grain elevator look very similar to the explosions that happened before the big one in Beirut:
