US1895868A - Water heating attachment for boilers - Google Patents

Description

Jan. 31, 1933. w. R. SMITH 1,895,868

WA TER HEATING ATTACHMENT FOR BOILERS Filed June 30, 1951 'IQD Patented Jan. 31, 1933 UNITED, STATES,

WILLIAM B. smart, or CHICAGO, ILLINOIS a warm nnermen'rrncnmn F B LE mu 's filed rune 30,

' My invention relates to a water heating attachment or equipment for installation particularly in steamboiler structures for the heating of water" in a water supply systein before reaching the points of co'nsump tion. An important object of the invention is to provide awater heating loop for installation in'a boiler structure in which water flowing therethrough is heated partially by the hot water or-steam-in the boiler and partiallydirectly b the heat or products of combustion in the fi i'e box for theboilerstructure. ';A further object is to provide an'arrangement' in which two of the'-'boiler tubes,'or tubessubstituted therefor are included in the water heating loop for exposure 'to the heat of the water or steam in the boiler, and a header connecting the front ends of these tubes and extending through the fire box for direct exposure to the fire and heat is alsoinclude'd'. A'still further object isto provide'a water heating loop whose side sections extend through the boiler to be supported by the '25 tube sheets of the boiler and whose front ends are connected by a head 7 of extended volume and heating [surface for 'exposure directly tothe fire in the firebox so that water flowing through the loop is partially heat- I 30 ed directlyyby-the "fire and partially bythe waterin the boiler, with the loop delivering heat to the boilerwhen the temperature of the water therein is higher than the temperature of the boiler water;

: IA further, object is toprovide a structure which can be easilyand' readily installed, which comprises simple and inexpensive parts, and which will rapidly andefiiciently heat and maintain the water at the required 8 40 t mperature for distribution through the hot water supply system. 7 g

The above andother features of the inven- 'tionwill be apparent from the structure and arrangement disclosed on the drawing, ;in which I I Figure' l is a side elevation, partly ver tical' longitudinal section, of a boiler 'structure and my water heatingattachment'ap plied'thereto; I p

" Figure 2'is asection of the boiler housing 1931. Serial No.547,924. i

on planeIIII of Figure 1, with theboilei partly in section and the in'plan' eleyation; and. i 1 r r'Figure Zia shows a flue iii longitudinal section'and onfe leg of a water loop therein.

The boiler structure shownis of the well 1 known Kewanee type comprising the horizontal-tubular boiler body 10 between whose front and rear itube sheets 11 and 12 extend the flues 13. The boiler is set on brick struc: ture 14 nd at the front thereof isthefire or combustion box 15 overthe gratestructure'16; Above the flues thewall 17extends forwardly from thefront-crbwnsheet 1'1 to formjthe .upper wall of the firebox and connectswith the frontwall1-8 ofthe fire box into "which fuel is .fedthrough the door-j way 19. The upper space 20 of the-boiler water heating loop above-the 'fiues extends forwardly to comsurrounding the firebox. a

The water heatingloop' comprises a head structure 22,;sideconductors 23 and-24 and the leads 25 and26 for connecting the loop serially the water-supply system usually extending from awwater main: to the different points ofhot'water consumption. My improved arrangement is such-thatthe side members or conductorsi23- and 24 extend through the boiler for-exposure tothe-water therein while the head'22 'iswithin the "fire box for direct exposure tothefire and heat therein; I may use two of'the-boiler flues for inclusion :in the water'heating loop but preferably I substitute other tubes for such inunieate withthe water jacket or legs 21 flues with the tubes, extending sufliciently' beyond the outer sides ofthe boiler tube sheets for "application thereto of suitable fittings for "securing thereto the head 22 and the leads 25 and 26. The'locationof the "tubes 23 and24= may be 'atdesire'd points in the boiler but a preferred construction is to utilize the spaces ordinarily occupied by the upper and side fiues'for the boiler. When a boileri's manufactured for use therein of my water heating attachment, the pipes 22 and 24 are inserted and secured. to the crown sheets in theordinarymanner, as forexample, by welding or brazing. Whenthe loop is to be installed in a boiler structure vnected with the other ends of-the' pipes which is already in use, two of'the flues are removed and the looppipes 23 and 24 substituted therefor and secured in place. The outer ends of the pipes are preferably threaded for'receiving suitable joint or cou pling members. I have shown a head 22 of substantially. U shape whose ends 27 v and .28

are securedto, theends of the pipes. 23a-and 24 by coupling or oint members 29 and 30,

and the distributing leads 25 and 26 are concoupling or jointmeinbers 31 and 32.

' 7 Where the pipes 23 and 24 are located in the upper and side flue holes, the head struc-, ture 22 will project into the fire box near the top thereof and the' shape and extent of the'head will depend upOnthe degree 'and rapidity of heating desired or upon the proportionate direct firetheatingofithe water to the heating ofthe water in the loop by the water'or steam inthe boiler; Ihave shown the head 22 laterallyexpanded so as to spread the water-flowing therethrough alongithe ex tended area of the headerwhich will be *ex posed to the flame and heat'i-n the fire box,

The header may be in the form of'a casting or may be. constructed of suitable sheet, metalparts welded or otherwise secured to gether. Instead of the speciallshaped head+ er, a length of pipe or a coil of piping could be extended between the ends. of thetubes 23 and .24 for directfexposure to the "heat inthe firebox. d Y

\5 Where the flues of a boiler are of comparatively large diameter, flues need not be removed for the installation of the hot water loop, but as shown in Figure 3 theside legs 33 of the loop could be extended through the desired flues. The pipes could also be of a length so that the joints or connection thereof with the leads and 26 would be outside of the furnace or'boiler structure walls. The

7 side pipes for the loops could then be inserted from the rear end ofrthe boiler structure through the desired fines and the-header 22 and the-leads then connected with the respective' ends-ofthe pipes. V g Ithu'si-providea water heating attachment or loop structure comprising a minimum .number of simple, inexpensive parts easily and readily assembled and installed in conrnectionfwithj'th'e boiler for the heating of the water flowing therethrough partly by the direct heat of the firebox and partly by the water or steam in the boiler. Where the header 22 is of extended-exposure surface for rapid heating directly by the fire, the

heated water in the loop may assist in heat- :ing theboiler water during periods when hot water is not being drawn-in great quantities 'fromthe hot water supply circuit. At other times the extendedheader 22 will maintain maxi mum thewater at the proper temperaturefor supply of hot water to the hot water circuit.

' rear ends of saidipipesbeing adapted to, eonends-thereof, two of said fluesforming. the

By utilizing the upper flues or flue passages for application of the water heating loop, the header 22 will be near the top of the fire box so that it will not interfere with proper firing or combustion conditions.

7 I have shown a practical and efficient embodiment of the features, of;.1ny.- invention,

butIdo notdesire to be limited. toithe'} exact construction and arrangement disclosed and described as changes and modifications may be made' without departing from the scope and spirit of the invention as defined in the ing of the watervby the fire, ".2.- The combination with aboilenand-a fire "box therefor ofia water heatingloopeom prising pipes extending through the boiler and the tubeijsheets thereof,Tai headerstruc ture connectedfwith the frontgends t the pipes to be disposedJentirely.withini-the fire box and extending horizontally jthereacrosS adjacent the top of. ;the fire box for; direct heating of; the water therein by the fire, the

heat the loop in a hot water supply-system 3- The combination witha boiler, having flues extending therethrough and ga firebox communicating-with said flues at thegf-ront sides vof a waterheating loop, a headereonnecting the front ends of said two flues to complete the loop, said header being entirely within the fire box (for direct heating-by the fire and said two. flues being heated boiler water, said header'comprising-a .rela' tively- 1 large flat hollow -flui'd container ex:- tending horizontally acrossthe fire box ad: j acent the top thereof, the reariends offlsaid two *flues being adapted' toriwnnection with @1 a hot water: supply lineriorfinclusion of the loop therein.

' v 4. The combination boilerandia box therefor, of a water =heating .U loop havi gits legs extending through the boilerand its bend entirely within the firebox and'extending horizontally'thereacross adj acent, the top of the firebox whereby 'Wateruflowing through the loop'will be partly directly heated by the fire and partly by th 'wat fifih 125 boiler; heloop-at its endsbeing adapted' for connection for inclusion in a hot water; sup- .plyzsystem." Y

5. The combination aaatgit ftaag flues therethroughand a firebox eomgxgni- M0 as r by he J30 eating with the fines, the upper side flues forming side legs of a water heating loop, a connection between the front ends of said two flues completing the loop and being disposed entirely in the fire box and extending horizontally thereacross adjacent the top of the firebox, and exposed to direct heating by the fire, the rear ends of said two flues being adapted for connection with a water supply circuit to include said loops therein.

6. The combination with a boiler having fiues and a fire box communicating therewith, of a water heating coil comprising pipes extending through some of said boiler flues, a header connecting the front ends of said pipes and located entirely within the firebox to be exposed to the direct heat ofthe fire, said header comprising a relatively large flat hollow fluid container extending horizontally across the fire box adi acent the top thereof, the rear ends of said pipes being adapted for connection with a hot watersupply circuit for inclusion of said coil therein. In testimony whereof I have hereunto subscribed my name at Chicago, Cook'County,

WILLIAM B. SMITH.

Illinois.

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