Bio-solid materials as alternate fuels in cement kiln, riser duct and calciner

Abstract

Alternate fuels and method of using the alternate fuels for replacing all or part of conventional fuels used to heat a riser duct, calciner or kiln in a cement making process.

1 . A method for supplementing or partial replacing conventional fuel in a cement making process with waste bio-solid material comprising the steps of: 
 selecting a waste bio-solid material having fuel value and other components that would not be deleterious to a finished cement made in said cement making process;    providing said waste bio-solid material with a moisture content at or below about 20% by weight said bio-solids having a maximum particle size of about 2 inches; and    introducing said bio-solid waste material into a combustion apparatus of said cement making process.    
   
   
       2 . A method according to  claim 1  including the step of adjusting said particle size of said waste bio-solid material to that required for the waste particles to remain in suspension in a combustion zone while being oxidized.  
   
   
       3 . A method according to  claim 1  including selecting said waste bio-solid material from the group consisting of municipal waste, paper making and wood processing wastes, industrial waste, food processing waste, and agricultural waste or mixtures thereof.  
   
   
       4 . A method according to  claim 3  including using a sludge of said waste material dried to a moisture content of at or below about 10% by weight and having an internal temperature at or below 104° F. (40° C.).  
   
   
       5 . A method according to  claim 3  including selecting organic dried sewage sludge as said waste.  
   
   
       6 . A method according to  claim 3  including selecting a waste material with fuel values and mineral values that can be recovered in a cement product by combination of said waste.  
   
   
       7 . A method according to  claim 1  including inventorying said waste material a storage device.  
   
   
       8 . A method according to  claim 7  wherein said waste material at a temperature not significantly higher than 104° F. (40° C.).  
   
   
       9 . A method according to  claim 1  wherein said waste solids are introduced into a main combustion zone of said cement making process.  
   
   
       10 . A method according to  claim 1  wherein said waste solids are introduced into one of a calciner, loop duct combustion zone or both in said cement making process.  
   
   
       11 . A method according to  claim 1  including the step of blending non bio-solid industrial waste having fuel and mineral values with said bio-solid waste material prior to introducing said blended material into a combustion apparatus of said cement making process.  
   
   
       12 . A fuel or fuel additive resulting from one of municipal waste, paper making and wood processing waste, industrial wastes, food processing waste, agricultural wastes and mixtures thereof dried to a moisture content of at or below 10% by weight and having a maximum particle size of about 2 inches.  
   
   
       13 . A fuel or fuel additive according to  claim 12  including one of high carbon fly ash, flue dust and mixtures thereof blended with said waste.  
   
   
       14 . A fuel or fuel additive resulting from blending one of municipal waste, paper making and wood processing waste, industrial wastes, food processing waste, agricultural wastes and mixtures thereof dried to a moisture content of at or below 10% by weight and having a maximum particle size of about 2 inches; and 
 one of high carbon fly ash flue dust or mixtures thereof.