| 摘要 |
PROBLEM TO BE SOLVED: To provide a heating device provided with catalyst which is safe and of compact construction and has high heat exchanging efficiency by a method wherein a required heat capacity is provided in each layer of tubes of a heat exchanger with catalyst corresponding to the conditions of fluids to be heated flowing through the tubes to prevent an abnormal temperature rise. SOLUTION: A gas flow passage 11 is formed in a cylindrical vessel 1 of a heat exchanger with catalyst, and a plurality of layers 2A-2D of tubes 2 which are connected by fluid tanks 3, 4 are formed. In the layers of tubes 2A-2D, passages of fluids to be heated are formed from the downstream side to the upstream side of gas flow, and an oxidation catalyst is not carried by the layers 2A, 2B, on the upstream side, wherein high temperature fluids to be heated flow, and the layers 2A, 2B are heated by the combustion heat of a burner 5 provided on the upstream side of the passage 11 to prevent the tubes and fins 21 from being heated to abnormally high temperature. In the layers 2C, 2D of tubes 2 where the temperature of combustion gas of the burner 5 rapidly falls, an oxidation catalyst is carried by the fins 21 and combustible gas supplied from a combustible gas feed duct 6 is fed to the layers 2C, 2D via a combustible gas feed port 61 to burn the combustible gas thereby making up for the heat. |
