New Patents xiii

4516426

I N S P E C T I O N D E V I C E F O R T H E T U B E P L A T E O F A H E A T

E X C H A N G E R

Pascal G Dumont, Daniel M Chiron, Chatenoy le Royal, France assigned to Framatome & Cie

The invention relates to an inspection device for the tube plate of a heat exchanger. It comprises a motive part (2) mounted on a support equipped with fixing means to the inlet face of the tube plate. The motive part (2) is driven in rotation and in translation along the axis of the tubes. The device also comprises an active part (1) car- rying an inspection probe (10) and guide means (17) for the probe (10) in the tubes. The active part (1) consists of a central shaft (8) and at least one sleeve (14) mounted rotatably on the shaft (8). The sleeve (14) comprises, in its side wall, at least two sets, spaced along the axial direction, of three orifices (15) placed at 120 degrees. Each of the orifices (15) contains a hall (17) projecting outwards. The active part (I) is connected to the motive part (2) by an articulation (3) permitting a disalignment between the active part (1) and the motive part (2). The invention is applicable particularly to the inspection of the defects under casing of a tube plate of a steam generator of a pressurized water nuclear reactor, with a Foucault current probe.

they receive additiona ! oxygen for this purpose. At temperatures above a set point determined near the third chamber, additional air enters to prevent excessive temperatures. Fume burning of hydrocarbon containing gases may also take place in the double reburn tunnel. The entering gases should have a velocity of about 40 ft./sec. and the entrained particles should have a size less than about 100 microns.

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F U E L P R E H E A T E R

Howard E Meyer assigned to Heat Exchange and Transfer Inc

A fuel preheating apparatus and method for use in conjunction with an internal combustion engine including a preheater wherein a flow oi" fuel to be heated is maintained in juxtaposition to a pair of selectively operable heat sources, one of which is a flow of engine coolant. An addi- tional heat source is provided to heat the flow of engine coolant through the preheater to thereby provide engine block warming during extended periods of engine shutdown.

4516510

I N C I N E R A T O R W I T H T W O R E B U R N S T A G E S A N D ,

O P T I O N A L L Y , H E A T R E C O V E R Y

John N Basic

A method of incinerating in a main combustion chamber leading directly to two consecutive reburn stages. The main combustion chamber accepts bulk refuse onto a hearth floor. In the first reburn tunnel, a burner maintains the tem- perature of the gases above a predetermined set point. Above that set point, the burner assumes a low setting. Below it, a high setting increases the heat produced. Alternatively, the gas may go to its high setting below a first set point; to its low setting above a second set point; and pro- portionate at temperatures between them. This chamber also receives outside air to assist in the actual combustion process. From the first reburn chamber, the gases go to a second reburn chamber to complete the combustion. There,

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H E A T R E C O V E R Y S Y S T E M A N D M E T H O D

William Ward

An air heater for recovering energy from process exhaust gases and the like includes a heat ex- changer disposed in the flow of exhaust gases, a blower for supplying an independent flow of air to be heated in the exchanger and the control sys- tern including dampers, driving mechanisms and thermostats for adjusting air flow in order to maintain substantially constant heated output air temperature. One of the dampers is disposed at the outlet of the blower and adjusts, by a thermostat an appropriate drive mechanism, the volume of air supplied by the blower based on outlet temperature. A pair of dampers are con- nected in oppositely acting (face and bypass) fashion and adjust the proportion of air passing through or bypassing the heat exchanger, again based on the temperature of the outlet air as sensed by a thermostat.