The fluid bed incinerator is essentially a cylindrical steel shell divided into two main chambers, both of which have a refractory lining. The refractory coating of a fluid bed incinerator is an integral piece of the design puzzle, as it operates under a positive pressure and has to protect the shell from corrosion, and withstand high temperatures. In addition, by nature of design, the refractory lining of a fluid bed incinerator fluid bed is subject to a highly abrasive environment.
Typically, the freeboard and bed are made with an 18” thick lining, comprised of an insulating firebrick with a fiber board backup insulation, while the windbox is constructed from a high-duty fireclay brick. This is a generalization, as there is no one size fits all refractory specification for a fluid bed incinerator. Different parameters such as temperature, size, pressure, and chemical interactions will all need to be taken into consideration when designing a fluid bed to ensure the proper refractory coating is selected for the application.