| 摘要 |
PROBLEM TO BE SOLVED: To prevent caulking of asphalt content in a heating furnace. SOLUTION: An asphalt-separating facility is provided having an extraction tower 2, a heating furnace 4, and a separation tower 6. In the extraction tower 2 a solvent such as LPG is mixed in a stock oil to extract the asphalt content from the stock oil. In the heating furnace 4 the asphalt-containing solvent supplied from the tower 2 via a first supply line 3 is heated. In the separation tower 6 the fluid supplied from the furnace 4 via a second supply line 5 is separated into the asphalt and the solvent. Between the first supply line 3 and an asphalt-discharging line 7 of the tower 6 is connected a recycling line 12 which feeds, to the line 3, a portion of the asphalt discharged from the separation tower 6, and is installed an asphalt-replenishing device 9 which serves to make the replenishment to the inlet of the furnace 4 when the flow rate of the fluid supplied to the furnace 4 is less. COPYRIGHT: (C)2004,JPO&NCIPI
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