Fluid projection apparatus for cleaning heat exchangers

Claim 1

Means for discharging liquid and a gas or vapor into a high temperature zone of a furnace or the like comprising in combination with a support, a lance tube supported thereby for rotation and longitudinal travel so as to move a forward end thereof into and out of such a zone, a hollow nozzle body carried by the forward end of the lance tube and having a lateral discharge orifice therein, and means for feeding a gas or vapor through the lance tube and out through said orifice, characterized by a pair of telescopably interfitted tubes within and substantially smaller in diameter than the lance tube and comprising a liquid feed tube fixed with respect to the support, a liquid lance tube slidably interfitted with the liquid feed tube and projecting forwardly therefrom within the firstmentioned lance tube and connected thereto at its forward end to move therewith, said liquid feed tube and liquid lance tube being isolated from the interior of the first-mentioned lance tube, the liquid lance tube having a liquid discharge orifice opening laterally outwardly through and to the outside of the nozzle assembly at an angle displaced sufficiently from the firstmentioned discharge orifice so that the blast patterns from said two orifices do not disturb one another when operating simultaneously.

Claim 4

The method of operating a dual discharge projection-type tubular cleaning device for furnaces and the like which device is adapted to be projected into and retracted from a hot zone, and which has radially spaced isolated passages including an outer passage for gas or vapor and an inner passage for liquid, comprising conducting liquid through the inner passage and discharging it therefrom into such a hot zone while simultaneously conducting gas or vapor through the outer passage at a relatively low flow rate and discharging it in a different direction into such zone, and thereafter increasing the pressure of discharge of the gas or vapor.

Claim 5

The method of operating a dual discharge projection-type tubular cleaning device for furnaces and the like which device is adapted to be projected into and retracted from a hot zone, and which has radially spaced isolated passages including an outer passage for gas or vapor and an inner passage for liquid, comprising conducting liquid through the inner passage and discharging it therefrom into such a hot zone while simultaneously conducting gas or vapor through the outer passage at a relatively low flow rate and discharging it in a different direction into such zone, and thereafter increasing the pressure of discharge of the gas or vapor.