US985834A - Feed-water heater for preventing pitting. - Google Patents

Description

J. G. PARKER. FEED WATER HEATER FOR PREVENTING PITTING. APPLIOATION.IILED JAN\13,1909.

985,834. Patented M21117, 1911.

IN VE/V TOR NTE sir-Ares. PATENT OFFICE.

J'OHII G. PARKER, 01 PHILADELPHIA, PENNSYLVANIA.

-FEED-WATER HEATER FOR PREVENTING PI'ITING.

Specification of Letters Patent.

Application filed January 13, 1909. Serial No.

Patented Mar. 7, 1911. 472,058.

ents which combine with iron, the tubes or other parts of the boiler are attacked and pitted injuriously. Particularly in the region of feed water heaters where the raw water at comparatively low temperatures is introduced, the pitting action is liable to be active. I have found that certain waters injurious to boilers when introduced in the usual way are not injurious when mixed with water that has been heated. It appears that the injurious constituents of the raw water, either by raising its temperature above a certain critical point or diluting it with water whose chemical constituents have been changed by boiling or by a combination of these conditions, are neutralized, so as to be non-injurious to feed water tubes or other parts of the'boiler. Waters such as those of the Delaware River have been found, in my experiments, to be injurious in their pitting actions when introduced at a temperature of say less than 200 degrees F. and non-injurious when combined with heated water so that the mixturehas a tem perature above 240 degrees F.

It is my leading object to prevent the feed water from injuriously aflecting the feed Water heater or economizer, preferably by mixing with the raw water, without permitting it to make contact with the metal of the economizer tubes, suflicient heated fluid to render neutral the otherwise injurious chemical constituents. I have satisfactorily accomplished this object by forcing a jet of raw water into the feed water tubes and drawing into the jet heated water from the boiler drum.

In practicing my invention I have successfully used the apparatus disclosed in the accompanying drawings and the following description thereof.

In the drawings, Figure 1 represents a sectional side elevation of apparatus embodying my improvements; and Fig. 2 is a sectional elevation representing details thereof.

drawings, are a plied to a steam generator comprising the rum 1, the feed water tubes 2 having the inlettube 3 and the outlet tube 4 connected with the drum, and the generator tubes 5 having the inlet tube '6 connected with the drum.

The inlet tube 3 has connected therewith, within the drum, a box 7 containing the port 8 and provided with the check valve 9 for preventing reverse flow through the port to the drum.

The junction box 10, which connects the uppermost feed water tube 2 with the inlet tube 3, has connected therewith a pipe 11.

The end of the upper tube 2 connected with the junction box has fitted therein an ejector comprising an outer nozzle 12, passages 13 leading from the passage 3 into the nozzle 12, and an inner nozzle 14 discharging from the pipe 11 into the nozzle 12, the jet from the nozzle 14 being within the fluid drawn into the nozzle 12 from the passages 13. Raw water, usually at a temperature of less than 200 degrees F., is forced through the pipe 11, conduit 15, nozzle 14: and nozzle 12 into the tube 2, and heated water at say 350 degrees F. is drawn from the drum through the tube 3, box 10, ports 13 and nozzle 12 into the tube 2, the raw water introduced being surrounded by theheated water from the drum and mingled therewith in the My improvements, as represented in the nozzle 12 for the purpose of raising the temperature of and diluting the water introduced to the feed water-tubes to the desired degree.

The. feed water can thus be brought to a condition such that the gases carried there' by do not attack the tubes while the amount of water drawn from the drum can be regulated by proportioning or setting the ejector so that no more will. be used than is necessary.

Having described my invention, I claim:

1. The improvements for heating feed water for steam generators which comprises, in combination with a tube, a nozzle through which heated water is discharged into said tube, a second nozzle by which feed water is discharged into said tube through said nozzle first named, and means for conducting feed water to said second nozzle.

2. The improvements for heating feed water for steam generators which comprises, in combination with a drum and a tube connected therewith, a nozzle through which heated water is discharged from said drum into said tube, a second nozzle by which feed water is discharged into said tube through said nozzle first named, and means for conducting feed water to said second nozzle. I

3. The improvements for heatingfeed water for steam generators which comprises, in combination with a drum and a set of feed water tubes connected therewith, a nozzle through which water from said drum is discharged into said tubes, a second nozzle through which feed water is discharged into said tubes, one of said nozzles discharging through the other, and means for conducting feed water to said second nozzle;

4. The improvements for heating feed water for steam generators which comprises,

in combination with a steam and Water drum and a set of feed water tubes connected therewith, a nozzle through which water from said drum is discharged into said tubes, a check valve for preventing reverse flow from said'nozzle to said drum, a second nozzle for discharging feed water into said tubes through said nozzle first named, and means for conducting feed water to said second nozzle.

In witness whereof'I havehereunto set my name this 11th day of January, 1909, in the presence of the subscribing witnesses.

JOHN C. PARKER.

Witnesses: I

Joe. G. DENNY, Jr. ROBERT JAMEs EARLEY.

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