Liquid heaters and vaporizers – Cleaning
Patent
1986-12-22
1988-05-03
Warner, Steven E.
Liquid heaters and vaporizers
Cleaning
165 84, 165 95, F23J 302, F28G 500, F28G 700
Patent
active
047412925
ABSTRACT:
A rapper system particularly adapted for removing slag and other encrustations from heat transfer tubes or walls of heat exchanger components. The rapper systems according to this invention employ an electro-impulse type actuator. Linkages couple the heat exchanger components to the actuator such that the actuator exerts simultaneous but opposing forces to the driven surfaces to generate a modal response at the surfaces. Such deflection causes ash encrustations to be removed from the heat exchanger components. According to one embodiment, an elongated cross beam is used with an actuator mounted to it and driving a single connecting rod, whereas other connecting rods are coupled to the cross member. In another embodiment, a pair of cross members are provided which are oriented along skewed axes and drive four or more points on the heat exchanger components. Another embodiment employs pairs of displaced rapper units which are actuated in a timed and phased relationship to generate displacement over large areas of the heat exchanger components.
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"Electro-Impulse Deicing Shows Promise", Aviation Week & Space Technology, Jul. 9, 1984.
G. W. Zumwalt, et al., "Flight and Wind Tunnel Tests of an Electro-Impulse De-Icing System", paper given at AIAA/NASA General Aviation Technology Conference, Jul. 10-12, 1984/Hampton, Va.
R. L. Schrag et al., "Electro-Impulse Deicing: Concept and Electrodynamic Studies", paper given at AIAA 22nd Aerospace Sciences Meeting, Jan. 9-12, 1984/Reno, Nev.
The Babcock & Wilcox Company
Warner Steven E.
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