Device for sealing and absorbing differential expansion between a chamber for cooling particles in suspension and a recycling duct

A device for sealing and absorbing differential expansion between a cooling chamber for cooling particles in suspension in a flow of fuel gas and a duct for recycling said particles to a combustion chamber, the device comprising:

• (a) a tubular expansion joint part interconnecting the wall of the cooling chamber and the recycling duct, the outside margin of one of the ends of the part being supported by the wall of an opening into the cooling chamber and the cross-section of the other end of the part being supported against the cross-section of the recycling duct;
• (b) a plurality of guide plates for guiding the tubular part, said plates being fixed to the outside wall of the cooling chamber and being distributed around the tubular expansion joint part and resting thereagainst by means of rolls, and clamping a sealing ring against the join line between the tubular expansion joint part and the wall of the opening in the cooling chamber;
• (c) a flat gasket disposed between the facing cross-sections of the tubular expansion joint part and of the recycling duct;
• and
• (d) flanges for controlled mutual clamping of the facing cross-sections of the tubular expansion joint part and of the duct, said flanges being provided with oblong holes for passing clamping bolts for allowing differential expansion to take place in two perpendicular directions, one of said flanges being provided with pebble-shaped parts each having a plane slip surface on one side facing said flange, and a surface on its other side bearing against a clamping adjustment shoe controlled by a screw passing through the other flange.