Boiler Unit

Abstract

The invention is concerned with an integrated unit comprising a unitary boiler and gas cleaning apparatus. Preferably the integrated unit comprises a boiler unit, and gas cleaning apparatus, the integrated unit has a reaction unit and further comprises a radiant zone connected to the reaction unit, the radiant zone being connected to a convection zone. The integrated unit further comprises a heat exchange means encircling at least one of the radiant zone and the convection zone, and gas cleaning means is preferably provided around at least a part of the heat exchange means. The reaction unit may comprise a fluid bed boiler, gasifier or pyrolytic chamber and wherein fuel is burned completely; burned under pyrolytic conditions; or is gasified. The heat exchange means may comprise an annular heat exchange chamber and the gas cleaning means may be provided in an annular gas cleaning chamber encircling the heat exchange chamber.

1 . (canceled) 
     
     
         2 . An integrated unit comprising a boiler unit, and gas cleaning apparatus, the integrated unit having a reaction unit and further comprising a radiant zone connected to the reaction unit, the radiant zone being connected to a convection zone, the integrated unit further comprising a heat exchange means encircling at least one of the radiant zone and the convection zone, and gas cleaning means being provided around at least a part of the heat exchange means. 
     
     
         3 . An integrated unit according to  claim 1  wherein the reaction unit comprises a fluid bed boiler, gasifier or pyrolytic chamber and wherein fuel is burned completely; burned under pyrolytic conditions; or is gasified. 
     
     
         4 . An integrated unit according to  claim 1  wherein the heat exchange means comprises an annular heat exchange chamber. 
     
     
         5 . An integrated unit according to  claim 4  wherein the gas cleaning means is provided in an annular gas cleaning chamber encircling the heat exchange chamber. 
     
     
         6 . An integrated unit according to  claim 5  wherein the gas cleaning means comprises an array of bag filters in the gas cleaning chamber and wherein the bag filter comprises at least one of: fabric; ceramic and metal material. 
     
     
         7 . An integrated unit according to  claim 6  wherein the heat exchange chamber and the gas cleaning chamber are arranged such that the flow of the gases is directly towards and in line with the bag filters and wherein the gas cleaning chamber comprises a number of sub chambers and wherein optionally the sub-chambers are fluidly separated. 
     
     
         8 . An integrated unit according to  claim 7  wherein a supply of pressurised air can be applied to a downstream side of the bag filters. 
     
     
         9 . An integrated unit according to  claim 8  arranged to apply pressurised air in a pulse and wherein the pulse is applied to each sub-chamber sequentially and optionally the boiler remains in operation. 
     
     
         10 . An integrated unit according to  claim 5  wherein a sorbent can be injected into the gas cleaning chamber. 
     
     
         11 . An integrated unit according to  claim 5  wherein waste material can be removed from a base of the gas cleaning chamber. 
     
     
         12 . An integrated unit according to  claim 1  wherein the gas cleaning chamber comprises a moving floor. 
     
     
         13 . An integrated unit according to  claim 12  wherein the moving floor comprises a rotating floor having at least one paddle extending between an inner band and an outer band and wherein the or each paddle is arranged to move waste particulate towards an open section. 
     
     
         14 . An integrated unit according to  claim 1  wherein the radiant zone is positioned above the reaction unit. 
     
     
         15 . An integrated unit according to  claim 12  wherein the convection zone is in free fluid communication with the radiant zone. 
     
     
         16 . An integrated unit according to  claim 5  wherein at least one wall of the annular chamber is formed by at least one helically wound heat exchange tube. 
     
     
         17 . An integrated unit according to  claim 16  wherein the at least one wall also defines at least a portion of the radiant zone and the convection zone. 
     
     
         18 . An integrated unit according to  claim 4  wherein the heat exchange chamber comprises an economiser and an evaporator. 
     
     
         19 . An integrated unit according to  claim 1  wherein a chimney is centrally located above the radiant and convection zones. 
     
     
         20 . An integrated unit according to  claim 1  having a footprint comprising that of a fluid bed boiler. 
     
     
         21 . An integrated unit comprising a boiler unit, and gas cleaning apparatus, the integrated unit comprising a radiant zone connected to the boiler, the radiant zone being connected to a reaction unit, the integrated unit further comprising a heat exchange means encircling at least one of the radiant zone and the convection zone, and gas cleaning means being provided around at least a part of the heat exchange means and wherein the heat exchange chamber and the gas cleaning chamber are arranged such that the flow of the gases is directly towards and in line with gas cleaning means and wherein the gas cleaning chamber comprises a number of sub chambers.