US464506A

US464506A - James d

Info

Publication number: US464506A
Authority: US
Publication date: 1891-12-08
Anticipated expiration: 1908-12-08

Description

I (N0 Model.)

J. D. LEE.

SMOKE GONSUMING FURNACE. No. 464,506. Patented DQO. 8, 1891.

UNITED STATES JAMES D. LEE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LEE SMOKE BURNER AND FUEL SAVING FURNACE COMPANY, OF SAME PLACE.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 464,506, dated December 8, 1891. Application filed September 8, 1890. Serial No. 364,257. (No model.)

To all whom it may concern/.- Be it known that I, JAMES D. LEE, of Ohicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in a Smoke -Consuming Furnace, of which the following is afull and complete description, when taken in connection with the drawings accompanying and forming a part hereof.

IO This invention is an improvement of the invention set out, described, and claimed in Patent No. 383,310, granted to me for a smokeconsuming furnace on the 22d day of May, 1888; and the object of this invention is to :5 obtain a device which can be attached to an ordinary boiler-furnace in combination with the device or an essential part thereof contained in the above-named patent, and wherein the completed furnace thereby attained will perform the same work under conditions where the draft is defective or poor as is performed under the ordinaryconditions of using a smoke-consuming furnace by the device de scribed in my said patent.

25 In order to accomplish the results sought by me, as aforesaid,in the device obtained by the combination of the invention herein described with the invention described in the above-referred-to patent and the devices in 0 common use in boiler-furnaces, I find it necessary to provide an arrangement for taking the contents of the smoke-stack or smokepassage of the furnace and return such material or materials to the furnace above the grate-bars of the combustion-chamber; to

provide means for introducing air through the bridge-wall of the furnace to theproducts of combustion or partial combustion passing thereover from the combustion-chamber, such air so passing through the bridge-wall to be forced through the passage or way provided therefor by a fan, or to be drawn through by the natural draft, as I choose to term it, of the furnace, although such natural draft may be produced when the dampers in the smokestack and the front door of the fire-pot are closed by the fan drawing the contents of the smoke-passage therefrom and returning them to the combustion-chamber over the gratebars thereof, as preferred, and, further, to introduce a current of air under pressure to the ash-pit'of the furnace, thereby creating, when the doors of the ash-pit are closed, a greater pressure of air in the ash-pit than in the combustion-chamber or in the room surrounding the furnace.

In the drawings, Figure 1 is a front elevation of the boiler-furnace having my inventions attached thereto; Fig. 2, a side elevation thereof, and Fig. 3 a cross-section on line 3 3 of Fig. 2.

Like letters refer to the same part throughout the several views thereof. 7

A is the boiler front; A, the inclosing walls of the boiler; A the boiler; A the line of .the bridge-wall; A the ash-pit; a a, the ash-pit doors; B, the combustion-chamber; B, the grate-bars, and B a fan. The fan B is connected to and with the smokestack 0 by pipe 0. 7o

' C is a discharge-pipe extending from the fan to both sides of the boiler-furnace, and O O are branch pipes which extend along the side walls of the boiler-furnace.

G C are pipes extending from branch pipes 7 C O to and into the combustion-chamber B.

It will be observed that I have'illustrated the pipe 0 as extending across and in front of the boiler-front A, and the branch pipes C O as extending along the side walls of the furnace, outside thereof; but it is evident that the pipe 0 may extend across the ash-pit above or below the doors and inside thereof, or may be placed underneath the ash-pit, and the pipes O 0 may, in like manner, be embedded or built into the side walls A A, if desired.

WVhen the fan 13 is in operation, the heated products from the combustion-chamber passing into the smoke stack or smoke passage 0, and withdrawn therefrom by the fan, are forced into the combustion-chamber above the grate-bars thereof in precisely the same manner as in the Patent No. 383,310, hereinbefore referred to, and constitutes the essential part of the invention secured by such patent. The several inventions made by me and combined with these essential elements of my former invention, and whereby I obtain the invention claimed herein are composed of the following elements: pipe D, embedded in the bridge-wall D, and pipes D D extending from pipe D to the inner face of the bridge-wall and valves 1) in pipe D 5 and, further, space E in the bridge-wall D, openings E E, extending from space E to the face of the bridgewall in the ash-pit A, and pipe E extending from space E to fan F and forming the discharge-pipe of such fan.

F is a pipe which may extend from the fan F to any part of the chamber wherein the furnace is located or to the outer air, as preferred. Unless it is desired to extend the pipe F to the outer air or to the top part of the furnace chamber or room, I do not consider the pipe F necessary, and in no case do I consider it an essential part of my invention.

hen the ash-pit doors a a are closed and the fan F is in operation, air is forced through the pipe E space E, and openings E" E into the ash-pit A" and a greater pressure of air thereby produced in such ash-pit than obtains in the combustion-chamber B, and an artificial blast of air is thereby forced through the grate-bars into the combustion-chamber. \Vhile air is contained under pressure, as stated, in the ash-pit it is heated to a considerably higher temperature than the air surrounding the furnace, and as it is forced into the combustion-chamber such portion of said air as is not required to enter into the combustion of the contents of the combustionchamber below the line of the openings of pipes C O is well adapted to combine with and assist in the combustion of the contents of the pipes 0 0 as such contents are delivered into the combustion-chamber.

IV hen I desire to force or apply pressure to the air passing through pipes D and D and from thence entering the furnace, I connect the pipe D with one of the branch pipes 0 but I have found such results can be attained by simply leaving the ends of the pipe D open, thereby securing what I term a natural draft through these pipes D D but I prefer, ordinarily, not to connectthis pipe D to pipe 0 It will be seen that in the device obtained by the combination of the several hereinbefore-described elements the contents of the smoke-stack or smoke-passage withdrawn therefrom by the fan are returned and forced into the combustion-chamber of the furnace in the same manner as in the device which forms the subject-matter of the patent hereinbeforc referred to; but in the present device I do not return or force any of such contents into the ash-pit, as is done in one of the forms of construction described in such patent, or through pipes embedded in the bridgewall of the furnace, as in another of the forms of construction therein described; but in place thereof I force air obtained either from within or without the building wherein the furnace is placed into the aslrpit and from there through the grate-bars into the con1bustionchamber, and I also in the present device supply air, either under pressure or not under pressure, as preferred, obtained from within or from Without such building through openings in the bridgeqvall to intcrmingle with the smoke, gases, or other products of partial combustion passingoversuch bridge-wallfrom the combustion-chamber and into the smoke stack or smoke-passage.

The amount of air forced into the ash-pit is regulated by the size and speed of the fan and by the dampers ff, and the amount of smoke, gases, or other products of partial combustion supplied to'the combustion-chamber from the smoke-stack or smoke-passage is also determined in the same way.

Having thus described my invention and its method of operation, What I claim, and (lesire to secure by Letters Patent of the United States, is-

In a smoke-consuming furnace, the combination of a fan, a pipe extending from the smoke-passage. of the furnace to the fan, a pipe extending from the fan to the combustion-chamber of the furnace, a pipe open at the end embedded in the bridge-wall of the furnace and having branch pipes extending therefrom to the inner face of the bridge-wall, a second fan and a pipe extending therefrom into the ash-pit, whereby the contents of the smoke-passage withdrawn therefrom by the first-named fan are returned to the combustion-chamber of the furnace, air is supplied to the heated matter, leaving the combustionchamber and passing over the bridge-wall to the smoke-passage, and air is forced into the ash-pit and from there to the combustionchambcr between the grate-bars thereof, substantially as described.

Janus 1). LEE.

\Vitn esses:

JULIUs L. GOLDBERG, I. I I. GOLDBERG.

ICO