In order to maintain temperature in the bed, what is introduced in the bed to maintain the temperature?
(a) Water spray
(b) Cooling coil
(c) Coolant spray
(d) All of the mentioned
I had been asked this question by my school teacher while I was bunking the class.
The origin of the question is Roasting of Sulphide Ores topic in chapter Industrial Applications of Fluidized Beds of Fluidization Engineering