| 摘要 |
PURPOSE:To prevent an acceleration of a thermal deformation by a method wherein an inner peripheral surface of a gasification mixing chamber is formed, a free end part of an inner wall of a combustion cylinder provided with an inner secondary air passage at a central part is heated by a generated flame of a burner plate to form a heat recovery wall. CONSTITUTION:An inner peripheral surface of a gasification mixing chamber 5 is formed, a generated flame 12 of an inner installed burner plate 6 surrounding an inner wall 1b of a combustion cylinder 1 provided with an inner secondary air passage 9 at the central part is formed toward the central part to heat the free end part of the inner wall 1b and to form a heat recovery wall 1d. With the above configuration, an opening of the heat recovery wall 1d formed at the free end part of the inner wall 1b under a heat of combustion is deformed toward the outer part and no substantial deformation is found and in turn a generated flame 12 is restricted by a deformation of the heat recovery wall 1d to cause the heat power to be weakened, resulting in that a permanent stain under an acceleration of thermal deformation may not be generated.
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