US864358A - Steam-boiler. - Google Patents

Description

BATENTEDAUG. 27, 1907.

L. W. S. BUSLER.

STEAM BOILER.

l APPLIOATION FILED une, 1901'.

00.000 0 .Y 0 @A0 o/Awo c;

LEVI W. S. BUSLER, OF SUNBURY, PENNSYLVANIA.

STEAM-BOILER.

No. Belars.`

Specification of` Letters Patent.

Patented Aug. 27', 1907.

Applioatipn filed April 6, i907. Serial No. 366.860.

To all whom it may concern:

Be it known that I, LEVI W. S. BUsLEn, a citizen of the United States, residing at Sunbury, in the county of Northumberland and State of Pennsylvania, have invented certain new and useful Improvements in Steam- Boilers, of which the following is a specification.

The purpose of my invention is to provideimproved means for promoting the combustion of gases from fuel in the furnaces of steam boilers, and the invention comprises an arrangement of air feeding devices adapted to supply air to the gases which are given off when fresh fuel is thrown into the furnace, and to hold the gases in check until they are ignited and consumed. The air feeding tubes are arranged so that they are always surrounded by water and therefore not liable to burn out, and their arrangement is such as not to obstruct the fire box or the flue leading therefrom.

In the accompanying drawing which illustrates my invention, Figure l is a longitudinal central section through the boiler; Fig. 2 is a section through the flue leading from the fire box, taken on the line 2-s2 of Fig. l, and Fig. 3 is a bottom plan view of a portion of the top of the fire box or crown sheet.

Referring to the drawing, A indicates the outer shell of the boiler, in the upper portion of which a nest of fire tubes l is arranged between the tube sheets 2 and 3. The boiler has an inner shell B extending in front of the tube sheet 2 and downwardly around the fire box G and also around the ue D which leads from the re box to the tube sheet 3. A partition 4 extends from the tube sheet 3 to the vertical wall 5 of the inner shell and this partition forms the top of the re box and :flue and the bottom of that portion of the boiler containing the fire tubes. The tube sheet 2 is placed at some distance back ofthe vertical wall 5, about in line with the rear end of the fire box, forming a smoke box E between the inner shell of the boiler and said tube sheet. The smoke box is closed at the bottom by a partition 6, which extends between the tube sheet 2 and the verti- Cal Wall 5, and said'partition is arranged at a suitable distance above the partition 4 in order to provide a water space between said partitions. A stack 7 leads upwardly from the smoke box as shown. A series of air tubes 8 evenly spaced apart throughout the area of the partition 6, extend downwardly through the partitions 6 and 4, and through the intervening water space, and a Casing 9, within the re box, extends over the'upper ends 0f the air tubes. A pipe l0 leads from the casing 9 to an air supply pipe'll, which is connected to a suitable blower (not shown) and provided with a valve l2. By opening the valve l2 jets of air, under pressure will be caused to flow through the air tubes 8, over the entire area of the re box, directly toward the fuel on the grate g.

Air tubes 13 and 14 extend horizontally through the front and rear walls or water legs of the fire box, respectively, these tubes being evenly spaced apart and located so that some of the tubes will be partly beneath the fuel on the grate g, while the uppermost tubes will be slightly above the fuel. A casing l5 extends over ,the outer ends of the tubes 13, and this casing is conltubes 14 and this casing is connected by a pipe 18 to the pipe 16 and thence to the pipe ll, so that when the valve l2 is opened jets of air will be projected horizontally through the air tubes 13 and la into the fuel a short distance below and a short distance above its surface. A bridge l9 is arranged above the rear water leg of the fire box, the rear side 19*L of said bridge being inclined, as shown, and at the rear of the bridge are arranged three series of air tubes 20, 2l and 22, which extend diagonally through the outer and inner shells of the boiler and through the intervening water space. The tubes 20 are arranged at the bottom of the flue and the tubes 2l and 22 are arranged at the sides of the flue. A casing 23 extends beneath the outer shell of the boiler and incloses the outer ends of the three series of tubes. A pipe 25 connects the casing with the air supply pipe ll. The air tubes 20, 2l and 22 are arranged so as to deliver jets of air into the flue in a direction to oppose the flow of gas from the fire box through the ue. An ash pan 26, hinged to the re box, extends beneath the grate g, and a pipe 27 connected to the pipe 16 extends through an opening 28 in the ash pan so as to deliver air under pressure beneath the grate g.

In operation when fresh fuel is thrown into the furnace through the doorway F and the door has been closed, the valve l2 is opened, thus admitting air through all of the air tubes, as indicated by the arrows. The air passing through the'tubes becomes intimately mixed with the smoke and gases arising from the fuel and forces the gases downward around the fuel on the grate. The air flowing through the tubes 20, 21 and 22 prevents the gases from fiowing through the flue D, and the air flowing through the tubes 13 and 14 mixes with the gases within and immediately above the fuel. The from the pipe 27 passes through the grate and upward through the fuel. The entire arrangement is such that a large amount of air is supplied in such a manner as to become intimately mixed with the smoke and gases, thereby supplying the necessary oxygen for combustion of the same, and the mixed air and gases are held in check and circulated in contact with the Y flames from the fuel, so that combustion of the smoke and gases which would otherwise pass out through the stack, takes place in the-furnace chamber and flue. After a short interval of time, when the newly added fuel has become heated and conditions become normal, the valve l2 is closed and the air supply shut off; or it may be left partly open to supply any desired amount of air.

I Show-n in the drawing. YOne .purpose of the closed ash As all of the air tubes extend through the double walls of the furnace and are protected by water, there Ais little danger ofthe tubes burning out, and the tubes do i' not in any way obstruct the fire box or iiue. Air tubes arranged above the fire box are peculiarly liable to 'injury from excessive heat, and my arrangement of tubes between .the smoke box and the fire box is particularly advantageous because the tubes are surrounded by l water and therefore less liable to injury from heat than they would Abe arranged directly within the fire box.

It will, -of course, be understood that my improvements are applicable to yboilers of other forms than that pan is to prevent the smoke and gases from lbeing driven y down `through the fuel and out past the grate by the air pressure from above. The vash pan closes the `iire box below the grate and the pressure in the ash pan is maintained by the air admitted `through the pipe 27.

By the 'use of my invention a large saving in fuel is effected. When fresh coal is thrown onto a hot fire l a large amount of the gas in the coal -is immediately sheet extending over said -re -box and ilue, a plurality of air tubes extending horizontally through the Walls of 'the re box, -a plurality of tubes extending diagonally through the walls of the iiue towards the throat between the fire -box and flue, ra plurality of lair tubes extending through the crown sheet over the fire box and through a water 'space in the boiler, and means for conducting air to said tubes.

2. In 1a steam boiler, a re Ibox., ya smoke box larranged above the =re box and sepa-rated yfrom the -c'rown sheet f.

thereof lby a water space, a plurality of air tubes extending through the crown sheet of the ire box and through the bottom of the smoke box, and means for conducting air to said air tubes.

3. In a steam boiler, a fire box, a smoke box arranged above the re box and separated from the crown sheet thereof by a water space, a plurality of air tubes extending through the lcrown sheet of the fire box and through the bottom of the smoke box, a casing in the re box extending over said tubes and an air pipe leading from the interior of said casing.

4. In a steam boiler, a fire box and a flue extending horizontally therefrom, said tire box and ue both having double walls with intervening water spaces, a crown sheet extending over said fire box and flue, a smoke box above said fire box and separated from the crown sheet by a water space, fire tubes above the crown sheet extending from the ue to the smoke box, a plurality of air tubes extending vertically through the crown sheet and the bottom' of the smoke box, a plurality -of air tubes extending -diagona-lly through the walls of the flue at the rear of the fire box and directed toward the throat between the re box and flue, a plurality of air tubes extending through the walls of the furnace, and pipes or conduits arranged to conduct air to said tubes.

5. In a steam iboiler, a fire box and a flue extending horizontally therefrom, said iire box and due both having double walls with intervening water spaces, a crown sheet extending over said re box and flue, a smoke box above said re `box and separated from the crown sheet by a water space, tire tubes above the crown sheet extending from the flueto the smoke box, a plurality of air tubes extending vertically through the crown sheet and the bottom of 'the smoke box, a plurality of air tubes extending diagonally through the walls of the flue at the rear of the re -box and directed toward the throat between the re ybox and flue, a plurality of air tubes extending through the walls of the furnace, casings extending over the outer ends of 'said tubes, and air pipes arranged to conduct air to the interiors of said casin'gs.

In Itestimony whereof 'I ax my signature, in Ipresence of two witnesses.

LEVI W. S. BUSLER. Witnesses:

ROBERT WATSON, NnwroN I. Winni-s.

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