US683762A - Feed-water heater. - Google Patents

Description

No. 683,762. Patented Oct. I, l90l. E. A. HITCHCOCK &. N. L. HAYDEN.

FEED WATER HEATER.

. JApplication filed Jan. 10, 1901. (No Model.)

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EMBURY A. l-IITOHOOCK, OF COLUMBUS, OHIO, AND NORMAN L. HAYDEN,

' OF NEW YORK, N. Y.

FEED-WATER HEATER.

SPECIFICATION forming part of Letters Patent No. 683,762, dated October 1, 1901.

Application filed January 10, 1901. Serial No. 42,748. No model.)

To all whom it may concern:

Be it known that we, EMBURY A. HITCH- COOK, of Columbus, in the county of Franklin; State of Ohio, and NORMAN L. HAYDEN, of New York, in the county of NeWYork and State of New York, have invented certain new and useful Improvements in Feed-VVater Heaters; and we do hereby declare the follow ing to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains t make and use the same.

This invention contemplates certain new and useful improvements in feed-water heaters.

The primary object is to heat feed-water under pressure bythe intermixing of live steam, so that all impurities will be separated from the water and the circulation will be greatly augmented, thereby increasing the efficiency of the boiler and permitting of a great saving of fuel By the means employed the temperature of the feed-water while under pressure in passing through the deliverypipe from a feeder may be raised to 250 or more.

A further object is to provide improved means for heating the feed-Water in the delivery-pipe by the introduction of live steam without obstruction by back pressure.

The invention will be hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure l is aview showing the application of our invention. Fig. 2 is an enlarged vertical sectional view of the heater.

I-Ieretofore various means and methods have been employed for heating feed-water previous to its discharge into a boiler, for the purpose, first, of avoiding waste of fuel consequent upon the introduction of water into the boiler. at a low temperature; secondly, to remove all impurities and scale-forming substances, and, thirdly, to improve the circulation of water in the boiler. In some instances the feed-water has been heated to the required extent by using steam-injectors as boilerfeeders in connection with boilers carrying high steam-pressures; but the required temtation cannot be secured where a comparatively low pressure of steam is maintained. By our present invention we are enabled to secure the required temperature in the delivcry-pipe of injectors of various capacities and under different conditions and also in the Water-discharge of an ordinary feed-pump even with low steam-pressure.

Referring to the drawings, 1 designates the is open, thus permitting feeding by either the injector or pump. Our invention being applicable for heating water under pressure regardless of whether it be delivered by an injector or a pump, we have shown both forms of feeders connected to a common deliverypipe.

12 designates the heater, which is located in the delivery-pipe intermediate the injector or pump and the boiler. It has the general appearance of a steam-injector, but differs from such a machine both in construction and operation. The casing 13 is formed at one end with a water-inlet 14, in line with which are a Water-inlet tube 15 and a combining and delivery tube 16, the cross-sectional area of the inlet end of the combining-tube being considerably greater than the cross-sectional area of the discharge end ofthe water-inlet tube. The opposed ends of the water and combining tubes are within the steam-cham- 9o ber 17, into which steam is supplied through pipe 3. The water travels through the delivery-pipe 5 at a high rate of speed, and in passing through the water-inlet tube of the heater and thence into the combining-tube a 5 vacuum is created about the inlet end of the latter, resulting in the drawing of the steam in with the water, the action of which is to heat the latter before it enters the boiler (or it may be a feed-water purifier intermediate the heater and boiler) to a temperature of 250 or over even with low steam-pressure.

Inthis 65 \Ve have found in actual practice that when the water is admitted to the heater under pressure'from the injector or pump a vacuum of twenty (20) inches or more is created at the point of entrance of steam to the heater. momentum of the delivered Water is so great that it will be heated and discharged even as against a very great back pressure in the discharge-pipe. The momentum and pressure of the feed-water are such that it will not only overcome the back pressure from the boiler, but also force the water through various resistances employed for filtration purposes.

From what has been said the advantages of our invention are apparent. It will be seen that we have provided means whereby water under pressure in passing to a boiler, either directly or indirectly, as first through a filter, may be heated by live steam to such an extent as to precipitate all foreign substances and at the same time overcome back pressure.

\Ve claim as our invention- 1. The combination with a feed-water pipe for a boiler, and a feeder for feeding the wa-' ter under pressure, of means, in said pipe intermediate the feeder and the discharge end, for allowing live steam to beentrained by the water in said pipe while under pressure and before its discharge into the boiler.

2. The combination with a feed-water pipe for a boiler, and a feeder for feeding the water under pressure, of a heater having asteamchamber to which live steam is supplied, and passage ways within such heater through The which the water under pressure will travel, said passage-ways allowing the water in its transit therethrough to entrain the steam from such chamber, asset forth.

3. The combination with a feed-water pipe for a boiler, and a feeder for feeding the water un der pressure, of a heaterhaving asteamchamber, a water-inlet tube at one end opening into said chamber, a combining and delivery tube leading from said chamber, the receiving end of said combining-tube being of greater cross-sectional area than the discharge end of the water-inlet tube, steam in said chamber being entrained by the Water in its passage from the water-inlet tube to the combining-tube, as set forth.

4. The combination with a feed-water pipe for a boiler, and an injector to which said, pipe is connected, of a heater located in said pipe compising a casing, a steam-pipe opening into a steam-chamber in said casing, and tubes within said casing forming passageways for the water under pressure and having communication with said steam-chamber so that the water in its passage through said tubes will entrain the steam from said chamber.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

EMBURY A. HITCI-IOOCK. NORMAN L. HAYDEN. YVitnesses:

CALL STEIB, ALEXIS COPE.

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