| 摘要 |
PURPOSE:To contrive to miniaturize a heat exchanging part and not to require a long and large burning chamber for preventing incomplete burning by a method wherein a porous object provided with many heat transfer passages communicating a liquid supply header with a liquid exhaust header is arranged via a narrow space over a heat transfer passage group provided between each heat transfer passage. CONSTITUTION:An object to be heated is transferred through a heat transfer passage 5 communicating a liquid supply header 3 with a liquid exhaust header 4. A premixed gas supplied from the lower side is passed toward the upper side through a small clearance 7 of a heat transfer passage group, introduced to a space between a heat transfer passage group A and a porous object B, then, ignited and burnt, a burning exhaust gas is exhausted by passing upward. The heated porous object supplies the heat to the heat transfer passage group, heats the object to be heated, and raises the object temperature. Meantime, the heat transfer passage group is cooled by a liquid to be heated transferred through the heat transfer passage, accordingly, the temperature rising of a premixed gas is restrained at lower level than an igniting temperature, thus, the generation of a backfire is obstructed. The porous object is heated at all time, therefore, the premixed gas is burnt perfectly, also the blow-off of a flame is prevented. |
