Back-ventilated refractory wall for an incinerator

Abstract

A fire-resistant wall intended in particular for use in an incinerator has a tube wall, composed of tubes connected by webs, and, placed in front and at a distance from the tube wall, a fire-resistant protective cladding composed of a plurality of fire-resistant tiles which are arranged next to and above one another and which are fastened to the webs of the tube wall via in each case at least one tile holder. The tiles are provided with continuous open grooves into which the tile holders engage. In the tube wall are provided inlet openings via which air can be introduced into the gap between the tube wall and the protective cladding. Also provided are outlet openings through which air can be removed from the wall. The air supply openings are arranged in the region of the open grooves of the tiles, with the result that the supplied air flows directly into the grooves and is distributed through these grooves over the entire wall. By incorporating the grooves into the air distribution system within the wall, the gap width between the tube wall and the protective cladding can be reduced to 5 mm, thereby considerably improving the heat transfer. It is possible at the same time to manage with relatively small air volumes and the pressure loss is considerably reduced, making possible considerable energy savings.

1 . A back-ventilated refractory wall comprising:
 a boiler wall,   a refractory protective lining spaced from the boiler wall, having a plurality of refractory tiles arranged next to and on one another, and each fastened to the boiler wall by at least one tile mounting, whereby between the boiler wall and the protective lining at least partially is an intermediate space, and   a port for feeding gas into the intermediate space between the boiler wall and the protective lining,   wherein the tiles define continuous grooves substantially running vertically and open toward the boiler wall and the grooves in the interior of the tiles have an expanded cross section, in which grooves the tile mountings engage, and the gas feeding port feeds the gas into the grooves or in the region of the grooves into the intermediate space.   
     
     
         2 . A wall according to  claim 1 , wherein the grooves of neighbouring tiles located on one another are in alignment and communicate. 
     
     
         3 . A wall according to  claim 1 , wherein the gas feeding port comprises a plurality of inlet openings arranged in the region of the grooves in the boiler wall. 
     
     
         4 . A wall according to  claim 3 , wherein the inlet openings are arranged in a lower region of the boiler wall or distributed over the boiler wall surface. 
     
     
         5 . A wall according to  claim 3 , wherein the boiler wall comprises a plurality of tubes connected by webs and the inlet openings are arranged in the region of the webs. 
     
     
         6 . A wall according to  claim 1 , wherein the width of the intermediate space is less than or equal to 5 mm. 
     
     
         7 . A wall according to  claim 1 , further comprising a port for discharging the gas from the intermediate space and the grooves. 
     
     
         8 . A wall according to  claim 7 , wherein the discharging port comprises a plurality of outlet openings penetrating the protective lining or the boiler wall and arranged in an uppermost region of the wall. 
     
     
         9 . A wall according to  claim 1 , wherein tile joints between the refractory tiles are sealed by ceramic strips of refractory material and a grout. 
     
     
         10 . A wall according to  claim 1 , wherein the tile mountings each comprise a bolt fastened to the boiler wall and having an internal thread and a flat tile support surface and a screw screwed into the bolt by which the spacing of the tile from the boiler wall is variable. 
     
     
         11 . A wall according to  claim 1 , wherein the tiles of at least one horizontal row of the tiles are arranged at a greater spacing from the boiler wall relative to the remaining tiles and thereby define a transverse channel through which the gas spreads over a width of the boiler wall. 
     
     
         12 . A wall according to  claim 1 , wherein at least some laterally neighbouring tiles define a continuous transverse channel substantially running horizontally, and which connects the vertical grooves of neighbouring tiles. 
     
     
         13 . A wall according to  claim 12 , wherein the tiles define a transverse channel arranged above or below an installation in the boiler wall. 
     
     
         14 . A wall according to  claim 12 , wherein the tiles having the transverse channel are arranged in rows spaced on one another. 
     
     
         15 . A wall according to  claim 1 , further comprising swirling elements for the gas flowing between the boiler wall and the protective lining.