| 摘要 |
Apparatus and methods for guiding a section of a heater tube to or from a mounting position along a wall of a fired heater while, for example, re-tubing the heater, are shown and described. In one embodiment, an apparatus incorporates an elongated member having a first end configured to be removably, rotatably and pivotally coupled inside the heater, and a second end spaced apart from the first end and configured to be coupled to a selected section of the heater tube. The elongated member can be rotated centrally within the heater about an axis of rotation aligned to intersect a central plenum section of the heater, and can be independently pivoted with respect to the heater about a pivoting axis non-parallel with the axis of rotation. The elongated member can rotate to position the second end of the elongated member radially inward of a selected section of the heater tube in its mounting position. The elongated member can pivot between a first position in which the second end of the elongated member approaches the selected section of heater tube and a second position in which the second end of the elongated member is spaced apart from the heater tube. When the elongated member is in the first position, the selected section of heater tube can be attached to or released from the second end of the elongated member. When the elongated member is in the second position, the apparatus can rotate within the heater about the axis of rotation to align its second end radially inward of the respective mounting position. In another embodiment, the apparatus incorporates a central member configured to be removably, rotatably coupled inside the heater to rotate about the axis of rotation. In this particular embodiment, an elongated member is pivotally coupled to the central member to rotate therewith and to independently pivot about the pivoting axis between the first and second positions. |
