| 摘要 |
PURPOSE: To obtain an improved fuel reformer capable of preventing the local abnormal superheating of a reforming catalyst even if the flame is deflected during the burning of a burner, and enabling the uniform heating of a cylindrical reforming tube in circumferential direction as far as possible. CONSTITUTION: A reforming tube 3 having a double-wall cylindrical structure and filled with a reforming catalyst 4 is placed in the inner circumferential region of a furnace vessel 1 having a burner 2 at the center, of the top. The reforming tube is heated by the combustion heat of the burner and the stock fuel passing through the reforming tube is reformed to a hydrogen-rich gas by steam reforming. A flame-surrounding tube 7 is placed in front of the burner to surround the flame 6 ejected from the burner and separate the flame from the inner wall surface of the reforming tube. The deflection of the flame is restricted by the surrounding tube to prevent the local abnormal superheating of the reforming catalyst caused by the direct contact of the flame with the reforming tube. The surrounding tube is made of a refractory brick or ceramic having high heat-resistance and holding a number of small holes 7a opened on the circumferential wall. The reforming tube is heated by the radiant heat and the heat of burnt gas flow passed through the small holes. |
