Arrangement in a wall and a method of coating a wall

A fluidized bed reactor system for combusting material at an elevated temperature and generating heat, said reactor system comprising:

• a space delimited by a supporting wall and containing an abrading flow of material;
• at least one recess provided on the internal side of the supporting wall, said at least one recess being defined by a first endwall and a bottom;
• and
• a coating provided on the internal side of the supporting wall, said coating having a first end and a second end, the first end of said coating extending from the first endwall of said at least one recess along said at least one recess, for recessing at least the first end region of the coating, said coating including a metal-sprayed erosion-resistant coating.

A fluidized bed reactor system for combusting material at an elevated temperature and generating heat, said reactor system comprising:

• a gas space delimited by a supporting wall and containing an abrading flow of material;
• a recess provided on the internal side of the supporting wall, said recess being defined by at least a first endwall and a bottom, a bend in the supporting wall forming the first endwall and said recess extending from the at least first endwall in the direction of flow of the abrading material;
• and
• a coating provided on the internal side of the supporting wall, said coating having a first end and a second end, said coating extending from the first endwall of said recess in the direction of flow of the abrading material, at least the first end of said coating being recessed in the first endwall region of the recess, and said coating including a metal-sprayed erosion-resistant coating.

A method of producing an erosion-resistant supporting wall for a fluidized bed reactor, which combusts material at an elevated temperature and generates heat, said method comprising:

• providing a supporting wall, the supporting wall delimiting a space containing an abrading flow of fluidized bed material;
• providing a refractory lining on the internal side of a lower portion of the supporting wall;
• providing a recess on the internal side of the supporting wall above the refractory lining, the recess being defined by at least an upper endwall and a bottom;
• and
• providing a coating on the internal side of the supporting wall above the refractory lining, the coating extending from the upper endwall of the recess to the refractory lining.