US694590A - Economizer. - Google Patents

Description

ENOMIZER (Appnmion mea oct. 9, 1899.)-

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Nn. 694,590. Patented Mar. 4, |902.

W. H. VERNON.

ECONDMIZER.

(Application filed Oct. 9, 1899.)

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E C 0 N 0 M l Z E R (Application med oct. 9, 1899.:

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UNITED STATES WILLIAM HARRY VERNON,

PATENT OFFICE.

OF VAKEFIELD, ENGLAND.

ECONOIVIIZER.

SPECIFICATION formingpart of Letters Patent N o. 694,590, dated.' March 4, 1902.

Application illed October 9, 1899. Serial No. 733,022. (No model.)

To @ZZ 10710777/ it Hefty concern:

Be it known that I, WILLIAM HARRY VER- NON, engineer, a subject of the Queen of Great Britain, and a resident of Wakefield, in the county of York, England, have invented certain new and useful Improvements in or Relating to Fuel-Economizers forHeatin g Boiler Feed-Water, (for which Letters Patent have been applied for in Great Britain, application No. 14,193, dated July 10, 1899, and in Germany, application No. 14,722, dated July 15, 1899,) of which the following is a specification.

This invention has reference to the type of fuel-economizers for heating boiler feed-water in which the water to be heated is passed through vertical pipes located in the flue leading from the boiler to the chimney and which pipes absorb the waste heat in the gases passing off from the furnace. It isa well-known objection in connection with this type of fueleconomizer that the vapor in these waste gases condenses on the outside ofthose pipes in which the cold feed-water enters and corrosion of such pipes is the consequence.

The object of the present invention is to obviate this result -by preventing the cold feed-water coming into direct-contact with the pipes upon which the waste heated gases This is effected by the employment' impinge. of an internal box and communicating tubes leading therefrom some distance into the central part of the Vertical feed-tubes, upon which the hot waste gases impinge and through which internal box and tubes the' cold feed-water is iirst admitted and conducted so that it has the chill taken off it before it passes into the vertical economizer tubes themselves.

The invention will be fully understood from the following further description in reference to the accompanying drawings, in which- Figure 1 is a View, principally in section, o f three of one row of vertical tubes and a bottom box of a fuel-economizer of the type here# inbefore described with my improvements embodied therein. Fig. 2 is a View, partly in elevation and partly in section, on the line X X of Fig. 1, showing the end tubes of five rows of vertical tubes and top and bottom boxes and top branch pipes, three of the said tubes being feedtubes. Fig. 3 ispan elevation from the opposite side of Fig. 2 of the tubes illustrated in the` lower*v part of the said figure and showing the internal feed-pipe extending above three of the series of feed-water tubes and the blow-off valves for clearing the sediment out of the inner and outer boxes. Fig. 4 is a section, taken on the line Y Y of Fig. 1, of an outer tube, the inner feed- 6o tube, and the stay for maintaining the latter in proper position. Fig. 5 is a section on the line Z Z of Fig. 1 of the bottom box and its internal box. Fig. 6 is a perspective View of my improved fuel-economizer.

Referring to the accompanying drawings, a b represent two bottom branch pipes of a fuel-economizer, c the bottom boxes, d e the vertical tubes leading from the latter and communicating with the top boxes f, which 7o open into the top branch pipes g h, all of which may be constructed inthe well-known manner.

In the drawings the invention is shown as applied toV a fuel-economizer or feed-water heater consisting of a series of rows of vertical tubes, and for the purpose of the present invention the first three rows d of the tubesviz., those farthest from the back of the fur- I nace-.are those into which the cold feed-water 8o enters. These three rows of tubes have their own separate and independent bottom branch pipe a and top branch pipe g, and the two rows of the remaining series of rows of vertical tubes e, through which the water passes after leaving the feed-tubes, also have their own separate and independent top and bottom branch pipes b and h, respectively, and communication between the two series of rows of pipes is effected by a diagonal pipe t', lead- 9o ing from the top branch pipe gof the one series to the bottom branch pipe b of the other series of tubes.

For the purpose of attaining the object of `the present invention, as hereinbefore stated,

I introduce into the bottom box of one or more rows of the cold-feed series of pipes an internal'or inner box 7c, to which may be attached or socketed a communicating vertical tube Z for each of the vertical feed-pipes d. Thesek roo internal tubes l rise upwardly some distance inside the feed-pipes d, and being of smaller diameter there is left between each pair of pipes d Za narrow annular space m, containing a thin layer or jacket of water, which becomes readily heated and is maintained in that condition by the hot waste gases which impinge upon the outer economizer-tubes d. Each of the internal tubes is provided with a stay consisting, preferably, as shown in Figs. l and 4, of a collarn, screwed,shrunk,or keyed on the internal tube Z and provided with radial arms o, extending to the outer tube d, so as to keep the internal tube in its proper vertical position and maintain an equal annulus m all around it. The wall of the inner bottom box is thickened at parts, as at p, thereby forming feet which raise it above the internal surface of the box c and leave a clearance or annular space r, so that the water may surround it.

According to the present invention the cold. feed-water enters the bottom branch pipe a and passes directly into the internal bottom box k. It then ascends the internal tubes Z, from whence it passes out and into the tubes d and into the annular spacesfm r. Upon the cold feed-water passing into the internal box and the internal tubes it abstracts part of the heat from the water-jacket contained in the annular spaces m r, and thus before entering the tubes d it has the chill taken o suficiently to obviate or almost entirely prevent condensation taking place on the exterior of the said tubes. IVhen the water becomes sufficiently heated, it rises in the economizertubes d and passes out into the top boxf and branch pipe g,down through the diagonal pipe i into the bottom box c, up the vertical pipes e into the top box f, and into the top branch pipe 7L, which leads to the boiler in the usual manner.

s represents the blow-off pipe for removing the sediment in the feed-water from the external bottom box c when the valve t, which may be of any of the well-known types, is opened for the purpose. The internal box k is also provided with a suitable valve or cock u, through which when opened the sediment is ejected therefrom.

A further advantage in connection with my invention is ythat owing to the employment of inner tubes of smaller diameter than the economizer-tnbes the volume of water passing through each pipe is reduced and the feed is thus caused to enter a larger number of the inner tubes, thereby insuring a more even distribution of the feed throughout the economizer-tubes.

Although I have shown and described the internal tubes as communicating With an internal bottom box, which is the system I prefer, I wish it to be understood that in economizers where the feed takes place in the top box an internal box would be inserted in the latter instead of the bottom box, as will be understood.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- In an apparatus of the character described, the combination with a series of verticallyarranged tubes (l adapted to be heated bythe waste gases, a box g with which the upper ends of the tubes d are in communication, a box c with which the lower ends of the tubes are in communication, a box arranged within the box c, means for admitting cold feedwater to the inner box, a series of tubes leading at their lower ends from the inner box and extending upwardly within the tubes d, and leaving an intermediate narrow annular space between them as described, of a series of vertical tubes c, a box with which the lower ends of tubes e are in communication, a box h with which the upper ends of the tubes e are in communication and a pipe i in communication with the box g and the box at the lower end of tubes e.

In testimony whereof I have hereunto set my hand in the presence of the two subscribing witnesses.

WVILLIAM HARRY VERNON.

Vitnesses:

CHAs. GILLIARD, ALFRED MANLEY IIoUcnToN.

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