Burner for boiler using biomass solid fuel

Abstract

The present invention relates to a burner for a boiler using solid fuel such as wood pellets or the like, which are in the spotlight as biomass energy, and realizes a new combustion type, wherein fuel is transported using a screw circulating water inside and burnt in a predetermined section supplied with air (oxygen) by a blower. Therefore, it is possible to secure the durability of the screw even at the high temperature generated during the combustion, and complete simultaneous treatment of sludge and ashes. In addition, it is possible to largely reduce the size of the boiler using solid fuels, thereby simplifying the entire structure of the boiler, while promoting the reduction of manufacturing cost.

1 . A biomass solid fuel boiler comprising:
 a fuel supplier ( 10 ) adapted to supply solid fuel;   a combustion device ( 11 ) adapted to burn the solid fuel; and   a boiler body ( 12 ) adapted to heat water using combustion heat, wherein   the combustion device ( 11 ) comprises:   a combustion chamber ( 15 ) having a solid fuel supply hole ( 13 ) on a front side and a sludge/ash discharge hole ( 14 ) on a rear side, the solid fuel being burnt in the combustion chamber ( 15 );   a screw ( 16 ) arranged along and in parallel with the interior of the combustion chamber ( 15 ) and installed so as to rotate, the screw ( 16 ) comprising a hollow pipe, inside which water circulates so that the screw ( 16 ) can endure high temperature inside the combustion chamber, the screw ( 16 ) being adapted to both feed the solid fuel and discharge sludge and ash through a rotating operation;   a driver ( 17 ) installed on a front portion of the combustion chamber ( 15 ) to rotate the screw ( 16 ); and   an igniter ( 18 ) installed on a lateral portion of the combustion chamber ( 15 ) to ignite the solid fuel.   
     
     
         2 . The biomass solid fuel boiler as claimed in  claim 1 , further comprising a blowing device ( 19 ) installed below the combustion chamber ( 15 ) to inject air necessary for combustion into the combustion chamber ( 15 ). 
     
     
         3 . The biomass solid fuel boiler as claimed in  claim 1 , wherein the screw ( 16 ) is wound in the shape of a spring having straight portions on both ends adapted to act as fulcrums during rotation. 
     
     
         4 . The biomass solid fuel boiler as claimed in  claim 1 , wherein the screw ( 16 ) is connected to a boiler water tube to receive water in the boiler water tube forcibly circulated by a circulation pump. 
     
     
         5 . The biomass solid fuel boiler as claimed in  claim 1 , wherein the screw ( 16 ) is adapted so that its size can be adjusted based on boiler capacity, and a plurality of screws ( 16 ) can be arranged in parallel and used. 
     
     
         6 . A biomass solid fuel boiler comprising:
 a fuel supplier ( 10 ) adapted to supply solid fuel;   a combustion device ( 11 ) adapted to burn the solid fuel; and   a boiler body ( 12 ) adapted to heat water using combustion heat, wherein   the combustion device ( 11 ) comprises:   a combustion chamber ( 15 ) having a solid fuel supply hole ( 13 ) on a front side and a sludge/ash discharge hole ( 14 ) on a rear side, the solid fuel being burnt in the combustion chamber ( 15 );   a screw ( 16 ) arranged along and in parallel with the interior of the combustion chamber ( 15 ) and installed so as to rotate, the screw ( 16 ) comprising a hollow pipe, inside which fluid circulates to lower temperature inside the combustion chamber so that the screw ( 16 ) can endure high temperature, the screw ( 16 ) being adapted to both feed the solid fuel and discharge sludge and ash through a rotating operation;   a driver ( 17 ) installed on a front portion of the combustion chamber ( 15 ) to rotate the screw ( 16 ); and   an igniter ( 18 ) installed on a lateral portion of the combustion chamber ( 15 ) to ignite the solid fuel, and   the boiler comprises a circulation fan or a compressor ( 30 ) adapted to push fluid into the hollow pipe-shaped screw ( 16 ) so that the fluid is introduced into the hollow pipe-shaped screw inside the combustion chamber.   
     
     
         7 . The biomass solid fuel boiler as claimed in  claim 6 , further comprising a circulation fan or a compressor ( 30 ) adapted to push fluid into the hollow pipe-shaped screw ( 16 ) so that the fluid is introduced into the hollow pipe-shaped screw inside the combustion chamber. 
     
     
         8 . The biomass solid fuel boiler as claimed in  claim 7 , further comprising:
 fluid circulation piping ( 28 ) connected to both ends of the screw ( 16 ) so that the fluid circulates outside the combustion chamber; and   a cooler ( 33 ) adapted to cool the high-temperature fluid, which has passed through the screw ( 16 ), outside the combustion chamber, so that durability inside the high-temperature combustion chamber is improved by lowering the temperature of the fluid circulated to the combustion chamber.   
     
     
         9 . The biomass solid fuel boiler as claimed in  claim 8 , further comprising a fluid injection/discharge hole ( 31 ) adapted to enable injection of a fluid into the fluid circulation piping ( 28 ) from outside the combustion chamber or discharge of the fluid. 
     
     
         10 . The biomass solid fuel boiler as claimed in  claim 7 , wherein the fluid circulating inside the hollow portion of the screw ( 16 ) comprises gas. 
     
     
         11 . The biomass solid fuel boiler as claimed in  claim 7 , wherein the fluid circulating inside the hollow portion of the screw ( 16 ) comprises a liquid-state refrigerant. 
     
     
         12 . The biomass solid fuel boiler as claimed in  claim 11 , wherein the circulation fan or compressor adapted to push the fluid into the screw ( 16 ) is a compressor or a screw fan adapted to circulate liquid.