| 摘要 |
The present invention relates to a pellet boiler, and more particularly, to a structure capable of improving thermal efficiency of a hot water pellet boiler or a steam pellet boiler and cleaning a combustion gas exhaust passage. The present invention is to remarkably improve thermal efficiency, simply and promptly clean a heating surface, and remove the occurrence of incomplete combustion. The present invention is configured by including: a boiler tube (10), a re-combustion tube (20), a water tube wall group (30), and fluid spraying units (40). The boiler tube (10) has an reverse U-shaped cross section. A heating water vessel (11) is formed around the boiler tube (10). A combustion chamber (12) is formed above the heating water vessel (11). in the re-combustion tube (20), a cylindrical re-combustion tube (21) which is opened at an side of a flame supply port (13) and closed at a rear portion thereof is installed in the combustion chamber (12) in such a manner that a flame circulation passage (24) is formed on the ceiling and a rear portion of the combustion chamber (12). Several flame through holes (22) are formed in the top surface of the re-combustion body (21). The water tube wall group (30) has upper and lower water tube walls (31a, 31b), which are provided by allowing multiple water tubes (32) to closely make contact with each other and connected with a lower portion of the re-combustion tube (20) of the heating water vessel (11) in a circumferential direction of the re-combustion tube (20) in such a manner that the flame circulation passage (24) and a combusted gas exhaust passage (33) communicate with the rear portion of the combustion chamber (12). The fluid spraying units (40) are installed at both side surfaces of the water tube wall group (30) of the heating water vessel (11). |
