| 摘要 |
PURPOSE:To prevent the occurrence of buckling in a reformer tube due to abnormal lowering of internal pressure by controlling the amt. of discharge gas with the differential pressure between the internal and the external pressures of the reformer tube when the gas contained in a fuel reforming apparatus is discharged. CONSTITUTION:When the gas contained in a reformer tube 2 system is discharged with a regulating valve 10, the pressure of the discharge gas is gradually lowered by controlling the regulating valve 10 with the valve control signal Vc1 of the first comparator 14-1 of a differential pressure controller 14 in accordance with the deviation between the pressure signal Px from a pressure detector 12 and the reference pressure signal Pxs. In said process, when the pressure lowering velocity of the discharge gas is so high that the amt. of the discharge gas becomes excessive and the internal pressure of the reformer tube 2 becomes lower than the external pressure, the differential pressure signal DELTAP detected by a differential pressure detector 13 is given to the differential pressure controller 14, and the differential pressure signal DELTAP is compared with the reference differential pressure signal DELTAPs by the second comparator 14-2 to output the second valve control signal Vc2 in accordance with the deviation. The signal Vc2 is synthesized with the signal Vc1 by a synthesizer 14-3, and the regulating valve 10 is controlled in the closing direction by the synthesized valve control signal Vc. |
