System for dry extracting/cooling heterogeneous material ashes with control of the air inlet in the combustion chamber

Abstract

The present invention relates to a system for dry extracting and cooling incinerator clinkers, mainly comprising an extraction-cooling unit and means for separating the environment of the combustion chamber from that of said unit. The system is able to reduce the final temperature of the extracted clinkers, without exceeding the air quantity that can be admitted at the entrance to the combustion chamber of the incinerator (FIG. 1 ). When the air flow needed for cooling process exceeds said quantity that can be admitted, the system allows exceeding air to be sent in the most appropriate point of the boiler downstream of the combustion chamber, by suitable control means.

1 . A system fit for dry extracting and cooling incinerator combustion clinkers, comprising:
 a dry extracting and cooling unit, based on belt conveyor transport means, adapted to be arranged downstream of a combustion chamber;   means for inletting cooling air, adapted to allow a controlled inlet of cooling air at a bed of clinkers transported on said belt conveyor transport means, wherein said cooling air laps in countercurrent the bed of clinkers in direction of the combustion chamber; and   control means for controlling quantity of said cooling air that reaches a loading point of the clinkers on said belt conveyor transport means for entrance in the combustion chamber, comprising seal members arranged in sequence along said belt conveyor transport means and substantially facing a clinkers transport portion of the belt conveyor transport means, each seal member developing in a direction substantially orthogonal to a direction of transport, said seal members being adapted to determine a controlled load loss in the flow of cooling air, substantially creating a labyrinth-type seal.   
   
   
       2 . The system according to  claim 1 , wherein each of said seal members is hinged at a casing of said belt conveyor transport means. 
   
   
       3 . The system according to  claim 1  wherein each of said seal members is shaped as an air lock with pivoting multiple bodies. 
   
   
       4 . The system according to  claim 3 , wherein air lock bodies more proximal to said belt conveyor transport means have greater weight, to level the bed of clinkers upon passage of more compressible material. 
   
   
       5 . The system according to  claim 1 , wherein said control means comprises at least one further stationary seal member arranged at a transmission head of said belt conveyor transport means upstream of the loading point of the clinkers thereon. 
   
   
       6 . The system according to  claim 1  wherein said control means comprises a duct adapted to connect an area of said transport means arranged downstream of said seal members in sequence with a boiler area downstream of the combustion chamber. 
   
   
       7 . The system according to  claim 6  , comprising dedusting means arranged at said duct. 
   
   
       8 . The system according to  claim 6 , comprising airflow regulation means, adapted to regulate the air flow in said duct. 
   
   
       9 . The system according to  claim 1 , wherein said control means comprises means for discharge in the atmosphere of at least part of the cooling air. 
   
   
       10 . The system according to  claim 1 , wherein said means for inletting cooling air comprises a plurality of air entrances arranged at a casing of said belt conveyor transport means and associated to an entrance section in the belt conveyor transport means having a substantially labyrinth-like structure. 
   
   
       11 . A method for dry extracting and cooling incinerator combustion clinkers, comprising:
 loading said clinkers on a dry extraction unit, based on belt conveyor transport means and arranging said clinkers downstream of a combustion chamber;   cooling said clinkers by a controlled flow of air fed in countercurrent along said belt conveyor transport means in direction of the combustion chamber;   carrying out a quantity control of said cooling air entering the combustion chamber by way of a controlled load loss caused by a labyrinth-type seal obtained through seal members arranged in sequence along said belt conveyor transport means and substantially facing a clinkers transport portion of the belt conveyor transport means , each seal member developing in a direction substantially orthogonal to a direction of transport.   
   
   
       12 . The method according to the-preceding  claim 11 , wherein carrying out said quality control further comprises allowing a selective connection of an area of said belt conveyor transport means arranged downstream of said seal members in sequence with a boiler area downstream of the combustion chamber. 
   
   
       13 . The method according to  claim 12 , further comprising regulating air flow fed to said boiler area downstream of the combustion chamber. 
   
   
       14 . The method according to  claim 11  , wherein entrance of cooling air is obtained at a casing of said belt conveyor transport means by one or more entrance sections in the belt conveyor transport means having a substantially labyrinth-type structure.