Circulating fluidized bed boiler - cyclone separator roof wear layer, high strength wear resistant castable

Ceiling wear-resisting layer for the high strength wear resistant castable, intermediate insulation layer for lightweight insulation castable physicochemical index (see table), the upper heat preservation for aluminum silicate fiber board, ceiling design structure is inverted type, the heat resistant to grasp the nail straight side and v-shaped nail after welding, and then upside down welding on the roof cover, and then in under the mold, cover the top of the hole pouring, so laborious, quality is not very ideal, because the weld thermal forcer in wear-resisting layer and insulation layer of the junction, exposed under the condition of the climax, ceiling pouring and straight wall casting is not the same bearing capacity.After the construction of roof pouring, the material depends on the pulling force of nails, and the heat-resistant nails exposed to high temperature for a long time, there are hidden dangers in the welding point under the action of load-bearing force.Based on years of construction experience and the joint discussion of the relevant construction units, our factory has improved the roof structure, the roof cover is not sealed first, and then sealed after the oven is finished. During construction, we will weld Angle steel or small channel steel between roof channels and bend heat-resistant steel bars into hooks.Welding on the steel channel, density of peg is 15 cm, then the hook laid heat-resistant steel bar network, fixed and spot welding, the reserved expansion joint, expansion joint of steel to disconnect, expansion joint gap is about 3 mm, the network brush on asphalt, after the formation of a good bottom die, according to the design thickness casting wear-resisting layer, have sufficient hardness after pouring insulation layer, after laying upper aluminum silicate insulation layer can also be used in the oven after laid, is advantageous to the oven evaporation, then carries on the roof seal.This structure does not have a welding point in the high temperature area, and it is an integral part that is not easy to fall off. After several years of practical operation, users are satisfied.Note: ceiling heat resistant nail steel is Cr25Ni20.

Attached table of light insulation pouring specification

Project refers to the standard

Refractory degree >1200 ℃

Volume density g/cm3 0.8

Compressive strength MPa 3

Change % <0.3 of reburning wire

Maximum operating temperature 1150 ℃

Thermal conductivity w/m. k. 0.3