Device and method for boiler superheat temperature control

Abstract

A boiler designed or retrofitted to produce less greenhouse gasses by using a substantially pure oxygen atmosphere in which to burn fuel. The boiler having a primary burner and water tubes is provided. The boiler further comprises at least one secondary burner located as needed in a zone above the primary burner area and below the boiler steam outlet. The secondary burner providing heat or energy to increase the temperature and quality of the steam. The secondary burner providing the heat or energy lost through the diminished flow rate of exhaust gases through the boiler as a result of the use of oxygen rather than pressurized air.

1 . A boiler comprising: 
 at least one primary burner for initial heating of water, the burner, located in a primary burner zone, being fed by a low flow rate of substantially pure oxygen in stoichiometric proportion to the boiler fuel;    a collection of water tubes, each tube having a first end in proximity to the at least one primary burner and a second end, spaced away from the first end and, in proximity to a boiler steam outlet; and    at least one secondary burner in a zone above the primary burner zone and below the boiler steam outlet, for producing energy for higher quality steam.    
   
   
       2 . The boiler of  claim 1 , wherein the at least one secondary burner is two secondary burners.  
   
   
       3 . The boiler of  claim 1 , wherein the secondary burner is provided with generally pure oxygen in stoichiometric proportion to fuel.  
   
   
       4 . The boiler of  claim 1 , including at least one of a superheater and a reheater.  
   
   
       5 . The boiler of  claim 4 , wherein the at least one secondary burner is placed adjacent the superheater.  
   
   
       6 . The boiler of  claim 4 , wherein the at least one secondary burner is placed adjacent the reheater.  
   
   
       7 . A boiler comprising: 
 at least one primary burner for initial heating of water;    a collection of water tubes, each tube having a first end in proximity to the at least one primary burner and a second end, spaced away from the first end and, in proximity to a boiler steam outlet;    at least one of a superheater or reheater in steam transfer connection with the steam outlet; and    two secondary burners, placed in a zone above the primary burner area and the steam outlet within the boiler, for producing heat or energy for increased quality of steam in the boiler.    
   
   
       8 . The boiler of  claim 7 , wherein the secondary burners are provided with generally pure oxygen in stoichiometric proportion to fuel.  
   
   
       9 . A method of retrofitting an existing burner to eliminate a substantial portion of greenhouse gases, comprising the steps of: 
 providing a feed of substantially pure oxygen to the primary burner or burners of the boiler;    providing at least one secondary burner for the boiler, the secondary burner being located above the primary burner area of the boiler; and    operating the boiler such that fuel in both the primary and secondary burner is burned in the presence of substantially pure oxygen such that the fuel is substantially combusted.    
   
   
       10 . The method of  claim 9 , including the step of providing a superheater in a superheat area in the boiler and placing the at least one secondary burner adjacent to the superheat area.  
   
   
       11 . A boiler comprising: 
 at least one primary burner for initial heating of water, the burner, located in a primary burner zone, being fed by a low flow rate of substantially pure oxygen in stoichiometric proportion to the boiler fuel;    a collection of water tubes, each tube having a first end in proximity to the at least one primary burner and a second end, spaced away from the first end and, in proximity to a boiler steam outlet;    a convection type superheater in steam transfer connection with the steam outlet; and    at least one nozzle or port in proximity to the convection-type superheater, for temperature changes to control temperatures of steam in the superheater.    
   
   
       12 . A boiler comprising: 
 at least one primary burner for initial heating of water, the burner, located in a primary burner zone, being fed by a low flow rate of substantially pure oxygen in stoichiometric proportion to the boiler fuel;    a collection of water tubes, each tube having a first end in proximity to the at least one primary burner and a second end, spaced away from the first end and, in proximity to a boiler steam outlet;    a convection type superheater in steam transfer connection with the steam outlet; and    said boiler using highly concentrated C02 and nitrogen deficient carrier gasses for fuel conveying as a process to control temperatures of steam in the super heater.    
   
   
       13 . A boiler comprising: 
 at least one primary burner for initial heating of water, the burner, located in a primary burner zone, being fed by a low flow rate of substantially pure oxygen in stoichiometric proportion to the boiler fuel;    a collection of water tubes, each tube having a first end in proximity to the at least one primary burner and a second end, spaced away from the first end and, in proximity to a boiler steam outlet;    a convection type superheater in steam transfer connection with the steam outlet; and    said boiler using highly concentrated C02 and nitrogen deficient carrier gasses for fuel conveying as a process of depriving the introduction of nitrogen into the carrier gasses for the carbon based fuel.