Combustor

Abstract

A combustor includes a combustion chamber having a grate provided therein and a combustion space formed above the grate; a fuel supply part downwardly connected to a center part of the grate so as to supply fuel to an upper part of the grate; an air supply part connected to a side part of the combustion chamber so as to be slanted on a horizontal plane, thereby supplying combustion air; a guide member disposed to protrude toward the inside of the combustion space from an inlet through which the combustion air flows into the combustion space, and opened downwardly so as to guide the combustion air; and protruding guide lines having a screw line shape and extending to be slanted downwardly on at least one of the respective surfaces, which face each other, of the guide member and the inner wall of the combustion chamber.

1 . A combustor comprising:
 a combustion chamber including a grate embedded therein and a combustion space formed above the grate;   a fuel supply portion downwardly connected to a central portion of the grate to supply fuel to an upper portion of the grate;   an air supply part connected to a side portion of the combustion chamber to be slanted on a horizontal plane, and supplying combustion air such that the combustion air rotates in the combustion space;   a guide member disposed to protrude toward an inside of the combustion space from an inlet through which the combustion air flows into the combustion space, and opened downwardly so as to guide the combustion air such that the combustion air, supplied by the air supply part, rotates downwardly along an inner wall of the combustion chamber in the combustion space; and   protruding guide lines having a screw line shape and extending to be slanted downwardly on at least one of respective surfaces, which face each other, of the guide member and the inner wall of the combustion chamber.   
     
     
         2 . The combustor of  claim 1 , wherein lengths of the respective protruding guide lines protruding laterally are reduced downwardly in a longitudinal direction thereof. 
     
     
         3 . The combustor of  claim 1 , wherein the protruding guide lines are formed on a surface of the guide member that faces the inner wall of the combustion chamber, and protrude to be slanted downwardly toward the inner wall of the combustion chamber. 
     
     
         4 . The combustor of  claim 3 , wherein downwardly slanted angles of the respective protruding guide lines, with respect to the inner wall of the combustion chamber, are greater downwardly in a longitudinal direction thereof. 
     
     
         5 . The combustor of  claim 1 , wherein the guide member is disposed such that a gap between respective surfaces of the guide member and the inner wall of the combustion chamber that face each other narrows in a longitudinal direction of the guide member in a position of the inlet of the combustion space, in order to increase a flow velocity of guided combustion air. 
     
     
         6 . The combustor of  claim 1 , wherein the guide member includes:
 an upper guide plate extending from an upper structure of the inlet in the combustion chamber, inwardly of the combustion chamber; and   a side guide plate extending downwardly from the upper guide plate and spaced apart from the inner wall of the combustion chamber.   
     
     
         7 . The combustor of  claim 1 , wherein the air supply part includes:
 an upper air supply portion connected to an upper side portion of the combustion chamber to supply the combustion air such that the combustion air rotates downwardly in the combustion space; and   a lower air supply portion connected to a lower side portion of the combustion chamber to supply the combustion air such that the combustion air is in contact with the fuel on an upper portion of the grate to be burned and then rises along a central portion of the combustion chamber.   
     
     
         8 . The combustor of  claim 7 , wherein the upper air supply portion supplies 1.5 times to 4 times as much combustion air amount per hour as the lower air supply portion. 
     
     
         9 . The combustor of  claim 1 , wherein the air supply part is connected to an outer wall of the combustion chamber, spaced apart from the inner wall while surrounding the inner wall, such that the combustion air rotates along an external surface of the inner wall of the combustion chamber and is then introduced into the combustion space through the inlet. 
     
     
         10 . The combustor of  claim 1 , wherein the grate is rotationally driven around the fuel supply portion. 
     
     
         11 . The combustor of  claim 1 , wherein the fuel supply portion passes through the grate to protrude into the combustion space, and is configured to have a screw form to continuously supply the fuel. 
     
     
         12 . The combustor of  claim 1 , wherein the fuel supply portion passes through the grate to protrude into the combustion space, and is provided with a blocking member, having a downwardly enlarged diameter and mounted on an end portion of the fuel supply portion, adjacent to the combustion space, to distribute the fuel laterally while blocking an upward movement of the fuel. 
     
     
         13 . The combustor of  claim 1 , wherein the combustion chamber has a frustoconical shape, in which an upper portion is relatively narrow and a lower portion is relatively wide.