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The selection of refractories for CFB boiler is very careful.
The composite micro expandable plastic is selected for the top of CFB boiler. The material adopts the transformation of quartz crystal phase and the use of compressed fiber ball to achieve the sealing effect, which can realize the expansion and sealing at a lower temperature.
Insulation measures of CFB boiler: comb plate is used to keep close to water wall to control and reduce hot air convection. At the same time, it is suggested that the outermost layer of insulation should be pasted with reinforced aluminum foil to reduce the harm of heat radiation to people. High thermal shock refractory castable is used for igniter. The igniter is the part of CFB boiler with the highest temperature and the most serious quenching and heating, so the material must have small linear shrinkage and high thermal shock stability.
Refractories for CFB boilers need to have high density, high strength wear resistance, high thermal strength, excellent corrosion resistance, good high temperature volume stability and erosion resistance.