generally is refractory insulation materials, casting materials.
Both needed! In fact, the insulation material contains refractory brick.
if use the rock wool or aluminum silicate, the furnace arch and furnace wall of biomass boiler all use refractory brick, and outside the furnace wall there is a layer of insulation material, some is perlite coal-fired boiler
The furnace arch and the furnace wall are all refractory bricks, and the refractory brick is a kind of thermal insulation material!
