That's comin' along really nicely, noviski.

I've been having some success with putting a spherical fire object into the mix. This is what I've tried, FWIW:

1. Scale the fire object small, about 1 percent, and move it below the ground plane (or somewhere else out of site) at frame zero. Make sure the fire doesn't catch or give shadows.
2. Add a bulb to the scene, at the same location as the fire and parented to the fire. Set the bulb's intensity to zero.
3. At the frame before the explosion starts, set a keyframe for the fire.
4. At the next frame, move the fire to the center of the explosion. Scale the fire a little bigger, and increase the intensity of the bulb.
5. Over the next few frames (depending on the extent of the explosion) scale the fire and intensity of the bulb up, then back down.
6. After the last frame where the fire should appear, move the fire back to where it was (hidden, scaled small, bulb intensity off).