Rashash and Sfas Emes answer the qustion of the Bach and explain that when Rashi says that (as he explained earlier) there was an commandment to put two blocks of wood on the altar in the morning and the afternoon, he meant that in the time of Shimon Hatzadick, there was no need to put any other wood on the altar. This is one of the miracles that continued in his day from the first temple. The gemorah (elsewhere) explains that the fire in the time of the first temple 'crouched like a lion', meaning that the miraculous fire of Hashem that had descended upon the altar continued and burnt all the korbanos. The only need for the physical wood blocks was because of the commandment.
Note that this is in the middle of the other miracles listed so that it is meant to be taken literally.