There are a number of rather intriguing aspects of the OT use of incense, and at some time in the future it would make a thread by itself. However the use of incense at a burial fire for Asa sparked interest in the fire itself. Here's what the passage says:
2 chron.16: 14 They buried him in his own tomb which he had cut out for himself in the city of David, and they laid him in the resting place which he had filled (L) with spices of various kinds blended by the perfumers' art; and (M) they made a very great fire for him.
It seems that making a great fire at funerals was a practice, yet it's exact purpose is unknown. Here are some other passages that also say a fire is involved in the burial rites.:
2 chron 21: 19 Now it came about in the course of time, at the end of two years, that his bowels came out because of his sickness and he died in great pain. And his people made no fire for him like (A) the fire for his fathers.
Jer.34: 5 thou shalt die in peace, and with the burnings of thy fathers, the former kings that were before thee, so shall they burn for thee; and they will lament for thee, Ah, lord! for I have spoken the word, saith Jehovah.
All these examples were funerals of kings but it may not be necessarily indicative that the practice was limited to them, tho the size of the fire naturally would be greater for men of station. But again we just don't know. Among suggestions that have been offered as explanations for the bonfire rite is that of recent scholars who've suggested the fires and burning incense were offerings for the deceased or to the deceased. The most interesting is the observation by W.Zwickel that the Assyrians had an apotropaic (way to ward off evil spirits or a god's negative will) burial ritual that involved making fires and burning items associated with the deceased. Some consevative Christian writers have dismissed these possibilties and declare that the fires were simply "honorary". Perhaps that was so in later practice,but that simply begs the question of just how a bonfire was chosen as means to honor the dead.
Does anyone have any further info?