Patent GB-971948-A (GB)
Title: Improvements in and relating to soot blowers
IPC: F28G3/16
Filed: 1963-03-26
Abstract: 971,948. Soot blowers. DIAMOND POWER SPECIALTY CORPORATION. March 26, 1963 [May 16, 1962], No. 11876/63. Heading F2N. .An apparatus for mounting a retracting type soot blower exteriorly of a wall of a heat exchanger comprises a pivoted mounting means which enables the soot blower, when retracted from the heat exchanger interior, to be angularly displaced about a pivot axis which is substantially transverse to the longitudinal axis of the soot blower lance tube. In the construction shown in Fig. 1, the soot blower 10 comprises an elongated beam 12 on which a carriage 14 is mounted, the carriage including an electric or fluid motor for advancing and rotating a telescopic lance tube 16. Pressurized fluid, e.g. air or steam, is supplied to the lance tube through a valve 22 mounted on a cleaning port or wall box 24 of the heat exchanger wall 26, a supply line 20 and a feed tube 18 housed coaxially within the lance tube. The forward end of the lance tube 16 is supported in a roller guide bracket 28. The beam 12 is suspended about its centre of gravity from a trolley 40 by a threaded shaft 52, the shaft being provided at its lower end with a universal joint 54 and a stepped, shaft 56. The stepped shaft is mounted on a thrust bearing (Fig. 2, not shown), housed in a bearing block 62, the block being rigidly connected to the beam 12. The shaft 52 threadedly engages within a bore of the body portion of the trolley 40 such that when the shaft is rotated by means of a sprocket wheel or pulley 68 connected to the stepped rod 56, a chain or belt 70 and a manually actuatable sprocket or pulley 72, the soot blower 10 moves in a vertical plane. A bearing block 74 of pulley 72 is adjustably mounted on beam 12 to correct the tension of the chain or belt. The beam 12 is provided at its outer end with a rail 82 which slidingly cooperates with a guide frame 84 (Fig. 3, not shown) of the soot blower suspension frame and at its inner end with a spigot 92 which is held within a leg 90 of the frame by a pin 94. The soot blower is retracted from the cleaning port 24, the pin 94 having been removed, such that the spigot 92 moves through a slot in the leg 90, then lowered by rotating shaft 52 and subsequently pivoted about its horizontal axis and moved towards the wall of the heat exchanger for servicing. In a modification (Fig. 3, not shown) the chain and sprockets device is replaced. by a manually rotatable transmission rod provided with a worm screw which cooperates with a worm wheel affixed to the lower end of a shaft similar to the shaft 56 in Fig. 1. The rod is locked in position by a pin passing through the rod and a fixed part of the rod mounting. In the construction shown in Fig. 4 a motorized carriage 14a moves along a rack 100 of the beam 12a, a poppet valve 102 being actuated by such movement to supply cleaning fluid to the soot blower. The supply line 20a is provided with a horizontally swivelling joint 104. The beam is supported at its outer end by a rod 113 and supports a bracket 106 which carries lance tube guide rollers 108. The wall box mounting device 114 comprises a sleeve 118 having at its outer end a seal formed by a manifold ring 120 and jets 124, compressed air being fed to the seal from a conduit 126. An outwardly projecting flanged sleeve 144 is affixed to the manifold ring, the ends of the sleeve 144 and of a complementary sleeve 146 being so shaped and contoured that relative angular movement is permitted. The sleeve 146 is attached to a ring 130 pivoted about a vertical axis by a pair of diametrically opposed trunnions 132. The sleeves are normally locked in axial alignment by a collar 148. A further compressed air seal assembly includes a manifold ring 134 and a lantern seal 136, the seal assembly being pivotally supported on ears 110 of the bracket 106. To pivot the soot blower towards the wall of the heat exchanger the collar 148 of the mounting device is disengaged from the sleeves 144, 146. In a modification the ring 130 may be pivoted about a horizontal axis (Fig. 5, not shown).