This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
熌 combines 火 (fire) with 閃 (flash), likely suggesting a flashing fire or sudden blaze, but the exact historical development is uncertain.
The left side is fire 火, and the right side is flash 閃. Picture a sudden flash of fire blazing up.
For セン, imagine a flash of fire sending a cent (coin) flying: cent -> セン, and the fire flashes.