Boiler

Abstract

A boiler has a tank, a hearth contained in the tank, a gas pipe having one end in communication with a gas exit of the hearth and the other end passing through the hearth, a combustor in communication with a bottom of the hearth, and a fuel supply device being connected to a fuel inlet of the combustor.

1 . A boiler comprising:
 a tank,   a hearth contained in said tank,   a gas pipe having one end in communication with a gas exit of said hearth and the other end passing through said hearth,   a combustor in communication with a bottom of said hearth, and,   a fuel supply device being connected to a fuel inlet of said combustor.   
     
     
         2 . The boiler as claimed, in  claim 1 , wherein a plurality of heat exchange fins is formed on a portion of said gas pipe in said tank. 
     
     
         3 . The boiler as claimed in  claim 2 , wherein a dust collection box is provided at said end of said gas pipe passing through said tank, and at least one filter screen is disposed in said dust collection box. 
     
     
         4 . The boiler as claimed in  claim 3 , wherein one heat insulation layer is provided round an outer surface of said tank. 
     
     
         5 . The boiler as claimed in  claim 1 , wherein a plurality of air supply holes is defined in a wall of said hearth, an air supply chamber is formed on an outside surface of said hearth surrounding said plurality of air supply holes, and an air supply pipe is provided air communicating said air supply chamber. 
     
     
         6 . The boiler as claimed in  claim 5 , wherein said air supply chamber is of a circular shape and said air supply holes are evenly disposed in said hearth. 
     
     
         7 . The boiler as claimed in  claim 1 , wherein said combustor has a combustion chamber, an ash excretion roller and an ash excretion motor, an ignition bar being in a bottom of said combustion chamber, a plurality of air inlets being defined in the bottom near a fuel inlet of said combustion chamber, said ash excretion roller being disposed in said bottom near an ash outlet of said combustion chamber and rolling in a direction to said ash outlet, said ash excretion roller being of barrel shape having air vents defined in a wall thereof, an air supply chamber being disposed under said combustion chamber, said air supply chamber being in communication with said air inlets at said fuel inlet and said air vents in said ash excretion roller, an output of said ash excretion motor being connected to an axle of the ash excretion roller. 
     
     
         8 . The boiler as claimed in  claim 7 , wherein said fuel supply device has a hopper, a rotor and a feed motor, a feed pipe being under said hopper and in communication with an opening in said hopper, said rotor being contained in said feed pipe and having a spiral sector formed thereon, said feed motor having an output being connected to said rotor. 
     
     
         9 . The boiler as claimed in  claim 8 , wherein said hopper is of conical and said rotor is disposed under a bottom of the hopper having a smaller cross-sectional area. 
     
     
         10 . The boiler as claimed in  claim 1 , wherein the boiler further has an ash tray under an outlet of said combustor.