| 摘要 |
An infrared heating unit which finds particular application in paper making equipment for coating drying and moisture profile control. In one embodiment, the heating unit comprises a housing and a heat resistant, porous ceramic matrix received in the housing having an inner surface, side walls and an external surface. The inner surface of the ceramic matrix and the housing cooperate to define a chamber. There is at least one resilient anchoring strip extending between the ceramic matrix and the housing about the perimeter of the ceramic matrix to retain the ceramic matrix in place within the housing and seal the edges of the ceramic matrix. An inlet to the housing is provided to admit a gas/air combustion mixture to the chamber. The gas/air mixture passes through the ceramic matrix to burn adjacent the external surface of the ceramic matrix to heat the external surface to incandescence. The resilient anchoring strip is adapted to expand or contract to accommodate relative movement of the ceramic matrix with respect to the housing due to heating expansion of the housing. In another embodiment, the edge of the ceramic matrix is sealed with a blocking agent to prevent flame propagation from the external surface of the matrix to the side walls, and a heat resistant layer is provided between the ceramic matrix and the housing to limit heat distribution to the housing and thereby thermal expansion of the housing. |
