US1048739A - Boiler-economizer. - Google Patents

Description

F. SARGENT & D. S. JACOBUS.

BOILER monomznn.

APPLICATION FILED JULY 16, 1912 1,048,739, Patented Dec. 31, 1912.

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Patented Dec. 31, 1912.

l I I l L r 1 l l ll BOILER ECONOMIZBR. APPLICATION FILED JULY 10. 1912.

WITNESSES:

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P. SARGENT & D. SfJACOBUS.

BOILER ECGNOMIZER.

APPLIOATION FILED JULY 10, 1912.

1,048,739., Patented Dec. 31, 1912.

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. UNITED STATES PATENT OFFICE- FREDERICK SARGENT, OF CHICAGO, ILLINOIS, AND DAVID S. JACOBUS, OF JERSEY CITY, NEW JERSEY, ASSIGNORS TO THE BABCOCK & WILCOX COMPANY, OF BA- YONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

BOILER-EGONOMIZERL Specification of Letters Patent.

IatentetlDee. 31,1912.

Application filed July 16, 1912. Serial No. 709,774.

To all whom it may concern Be it known that we, FREDERICK SARGEN'I, a citizen of the United States, and a resident of Chicago, in the county of Cool: and State of Illinois, and I).\VII) S. Jaconvs, a citizen of the United States, and a resident of Jersey City, in t he county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Boiler- Economizers, of which the following is a specification.

The purpose of an economizer is to preheat the boiler feed water, or to heat water 'for other purposes, and is placed in the line between the boiler, or other source of waste heat, and the stack; that is, an economize! is used to recover from the gases of combustion, heat that would otherwise escape through the stack. An econo-mizer in reality forms an extension of the heating sur-' face proper, but it is more effective for the transfer of heat than the last pass of the boiler heating surface, because of the lower temperature of the contents; it being wellknown that boiler surface does not extractheat from the gases once they have ap-' proached a temperature corresponding to the steam pressure in the boiler.

The advantages of an economizer in utilizing the heat of the escaping gases are well-known; but in its development it has been ascertained that increasing the velocity of a given weight of gases in making them tlow over a given amount of surface, increases the heat transfer rate and the elliciency. To utilize this principle, the gases must be given a long travel over the econo- IlliZQI' tubes either by the use of ballles for contracting the cross sectional area of the path of the gases, or by the use of a relatively long and narrow cconomizcr. For a minimum dra't't resistance the best results are obtained by the use of a long and narrow economizer, as the gases then travel in a straight path through the eelmoi'nizcr and the resistance of turns and bends in the path of the gases is eliminated. in modern power plant practice, where economy of door space is an important item, it is practically impossible to install economizers to advantage of a length sullicient to give the best heat transfer results if it were attempted to do this in the ordinary way.

.-The object of the present invent-ion therefore, is to provide a means whereby the advantages attaching to a long and narrow eeonomlzer may be attained where economy of floor space is a desideratum. I

In carrying out our invention we place the economizers in pairs above and transversely of the boilers, and the gases from two boilers are madeto pass in opposite directions through the economizers and thence to exhaust fans, from which they are discharged through llues leading to the stack.

The invention will be understood by reference to the accompanying drawings in Figure 1 is a side view of a boiler setting having our arrangement of eeonomizers;

llig Z, a top view and Fig. 3, a front view. We have shown In the drawings a pair of boilers spaced apart. In a plant having more than two boilers they would be arranged in two lines in pairs, a pair constituting a, unit, and as they are similar in construction and arrangement it will only be necessary to refer to one pair. Each unit comprises two boilers l and 2, the boilers being set back to back as shown in the drawings although this is not essential, that is, the firing doors may be at the front, rear or sides as may be desired in any particular installation. Again, the boilers may be set so that there no space between them. Ilaccd side by side above and transversely of the boilers and spanning any space that may be left between them, are two economixers 3 and 4. The 'asl'c gases from boiler 2 pass upward through a flue 5 to the economizcr inlet, lhcnce through the economize! 3 lo a fan (i at a point above the trout of boiler 1, from which they are discharged into a llue 7 and finally into lhe stack 9 through a.connecting fine 8. The gases from boiler 1 pass upward through a lluc l0, thence through economize! 4 to a fan ii at a point above the front of boiler 2, from which they are discharged into a line 12 and pass through a (amneelin-g llue 13 to stack 9.

\Vith the arrangement above proposed it is possible to have a compact and ell'eclive economizer arrangement with a minimum amount of lloor space. The gases are led through the economizers in opposite direetions with a minimum number of turns, and may be discharged from the fans into the fines 7 and l2 in the direction in which they travel in the said fines, so that there is no undue loss through not utilizing the velocity of the gasesimparted by the fans, the I'fans being placed directly under said flues.

It .is possible, as shown by the drawings, to install a series of economizers in the way indicated and maintain the advantages secured in a single unit.

What we claim is 1. 'A boiler unit comprising two boilers spaced apart, an economizer for each boiler placed above and spanning the boilers, andflues for conducting the gases from the boilers to the'economizers, and from the economizers to a common stack.

- 2. A boiler unit comprising two boilers, an economizer for each boiler placed above and spanning the boilers, and fines for direnting the gases from the boilers through and transversely of the boilers and spanningthem, and flues connecting each boiler with its economizer so as'to cause the ,gases to travel the'economizers in opposite directions.

5. A boiler unit comprising two boilers, an economizer for each .boiler placed above and transversely of the boilers and spanning them, fiuesconnecting each boiler with its economizer, the outlet of each economizer being at a point abovethe other boiler, flues into which the gases discharge from the general direction in economizers,rsaid discharge 'flues directing the gases to a common stack in the direction in which they travel in the flues.

' 6. A boiler unit comprising two boilers, an economizer for each boiler placed above and transversely of the boilers and spanning them,flues connecting each boiler with itseconomizer, the outlet of each economizer being at a point above the other boiler, lines into which "the gases discharge from the economizers, a fan in each of the discharge flues, said fans forcing the gases to a common stack in the direction in which they travel in the flues.

7. A boiler unit comprising two boilers,-

an economizer foreach boiler placed above and spanning the boilers, and fines for C011". from the boilers to theducting the gases economizers, and from thence to a stack.

8. A boiler unit comprising twoboilers, an economizer for each boiler placed above and spanning the boilers, flues for conducting the gases from the boilers to the economiz ers, a fan attached-to the discharge fine of each economizer, said fans forcing the gases to flues'leadingto a stack in the same the fines.

which they travel in In testimony" whereof we have hereunto signed our names 1n the presence of two subscribing witnesses. 1 y FREDERICK SARGENT.

DAVID S. JAGOBUS. Witnesses to Frederick Sargents signature:

R. J. Smssan, M. WOOLLEY. Witnesses to David S. J acobu signature:

' W. T. FLEMING,

E. P. TERRY.

Copies of this patent may be obtained for five cents each by addressing the Commissioner of liitents,

Washington, D. 0.

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