| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure a safe catalysis combustion heating apparatus with short starting time in which the entire apparatus can be activated in an early time with a simplified construction while preventing a fin and a tube from being locally heated and uncombusted gas from being exhausted. SOLUTION: Many tubes 5, through each of which a fluid to be heated flows, and to each of which a catalyst carrying fin 51 joins, are disposed in a combustion gas flow passage 11 of a heat exchanger 1, and the fluid to be heated is heated by oxidization of fuel gas. A controller 6 restricts heat transfer into the tube 5 by regulating the flow rate of the fluid to be heated to a small value until the temperature of the fluid sensed by a temperature sensor 8 disposed in the vicinity of an outlet of a flow passage 55 for the fluid to be heated exceeds predetermined temperature, e.g. the boiling point, and the temperature of the fin 51 is raised in an early time to the catalyst activation temperature. After the boiling point is reached, the flow rate of the fluid to be heated is increased up to a prescribed value to promote heat transfer to the fluid to be heated whereby desired high temperature gas is ensured while preventing the temperature of the fin 51 and the tube 5 from being high needlessly.</p> |
