Question 279Steam Plants - 1st Asst/Chief

The correct answer is D) Firebrick. Firebrick is a type of refractory material that can withstand the highest temperatures in a furnace, typically between 1,500°F and 3,000°F. This makes it the ideal choice for areas directly exposed to the highest heat in the furnace, such as the firebox or combustion chamber. Firebrick is a specialized type of brick designed to resist high temperatures, thermal shock, and chemical reactions that occur in a furnace environment. The other options, such as baffle mix, insulating block, and insulating brick, are not suitable for use in the highest heat areas of a furnace as they cannot withstand the extreme temperatures and may deteriorate or become damaged.