Convective section combustion

Abstract

An oxy/coal combustion system and method include a furnace arranged and disposed to receive and combust a first solid fuel to form a combustion fluid, a convective section having one or more inlet devices, the convective section arranged and disposed to receive and combust a second fuel in the presence of the oxygen, and one or more heat exchangers arranged and disposed to exchange heat with the combustion fluid.

1 . An oxy/fuel combustion system comprising:
 a furnace arranged and disposed to receive and combust a first fuel with oxygen to form a combustion fluid, the first fuel provided from a first solid fuel source;   a convective section having an inlet device, the convective section arranged to receive the combustion fluid from the furnace and disposed to receive a second fluid, the second fluid converted from a second fuel, the second fuel being a solid fuel; and   one or more heat exchangers in the convective section arranged and disposed to transfer heat from the combustion fluid to a heat exchange medium.   
     
     
         2 . The system of  claim 1 , wherein the inlet device is arranged and disposed to receive the oxygen. 
     
     
         3 . The system of  claim 1 , wherein the inlet device is recessed from the convective section. 
     
     
         4 . The system of  claim 1 , further comprising a solid fuel conversion mechanism selected from the group consisting of a fluidized bed, a gasifier, a combustor, an additional burner, a micronizing pulverizer, and combinations thereof, wherein the solid fuel conversion mechanism is arranged and disposed to convert the second solid fuel into at least a portion of the second fluid. 
     
     
         5 . The system of  claim 1 , wherein the first fuel includes coal. 
     
     
         6 . The system of  claim 1 , wherein the second fluid includes micronized coal. 
     
     
         7 . The system of  claim 1 , wherein the second fluid includes a volatilized fuel. 
     
     
         8 . The system of  claim 5 , wherein the volatilized fuel is generated by mixing the second fuel with a recycled flue gas. 
     
     
         9 . The system of  claim 1 , wherein the conversion mechanism is a gasifier arranged and disposed for the oxygen to oxidize the second fuel. 
     
     
         10 . The system of  claim 9 , wherein the gasifier is a slagging gasifier. 
     
     
         11 . The system of  claim 1 , wherein the conversion mechanism is a combustor. 
     
     
         12 . The system of  claim 1 , wherein the first fuel is a solid fuel. 
     
     
         13 . The system of  claim 1 , wherein the first solid fuel source is arranged and disposed for providing the second solid fuel source. 
     
     
         14 . The system of  claim 1 , further comprising a conversion mechanism selected from the group consisting of a fluidized bed, a gasifier, a combustor, an additional burner, a micronizing pulverizer, and combinations thereof, the conversion mechanism in communication with the first solid fuel source thereby converting the first fuel prior to the first fuel being received by the furnace. 
     
     
         15 . The system of  claim 1 , further comprising water cooled tubes bounding a convective combustion zone corresponding with the inlet devices, wherein the water cooled tubes provide heat transfer protecting at least one of the one or more of the heat exchangers. 
     
     
         16 . The system of  claim 1 , further comprising a control system arranged and disposed for modifying the flow rate of the second fluid. 
     
     
         17 . An oxy/fuel combustion method comprising:
 providing a furnace and a convective section, the furnace in fluid communication with the convective section;   providing a first fuel from a first solid fuel source;   receiving the first fuel in the furnace;   combusting the first fuel in the furnace thereby producing a combustion fluid;   receiving the combustion fluid in the convective section;   converting a second fuel into a second fluid, the second fuel being a solid fuel;   receiving the second fluid in a convective section; and   transferring heat from the combustion fluid to a heat exchange medium.   
     
     
         18 . The method of  claim 17 , further comprising converting the second fuel to the second fluid by a fluidized bed. 
     
     
         19 . The method of  claim 17 , further comprising converting the second fuel to the second fluid by a gasifier. 
     
     
         20 . The method of  claim 17 , further comprising converting the second fuel to the second fluid by a combustor. 
     
     
         21 . The method of  claim 17 , further comprising converting the second fuel to the second fluid by an additional burner. 
     
     
         22 . The method of  claim 17 , further comprising converting the second fuel to the second fluid by a micronizing pulverizer. 
     
     
         23 . The system of  claim 1 , further comprising controlling the flow rate of the second fluid by a control system.