USRE12072E - Smoke-consuming furnace - Google Patents

Description

No. 12,072. REISSUED JAN. 6, 1903.

. H. E. PARSON.

SMOKE CONSUMING FURNAGE.

APPLICATION FILED MAR. 31, 1902.

SHEETS-SHEET 1.

IIIIU yucul'or No. 12,072. y REISSUED JAN. 6, 1901.3.

H. E. PARSON.

SMOKE CONSUMING PURN'AGE.

APPLICATION FILED MAR. 31,1902. n

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HENRY E. PARSON, OF BROOKLYN, NEW YORK, AssIGNoR, RY MESNE AssIGNMENTs, TO PARsON MANUFACTURING COMPANY OF NEW YORK, A

CORPORATION OF NEW YORK.

SPECIFICATION forming part of Reissued Letters Patent No. 12,072, dated January 6, 1903. Original No. 681,457. dated August 27, 1902. Application for reissue filed March 3l, 1902. Serial No. 106,832.

To aZZ whom it may concern:

Be it known that I, HENRY E. PARsON, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New 5 York, have invented certain new and useful Improvements in Smoke Consuming Fur'- naces; and Ido rhereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled .ro in the art to which it appertains to make and use the same. v p This invention relates to certain improvements in furnaces ofthat kind in which a forced draft is applied to the coal on the I5 gratos while the ire and ash-pit doors are closed, so that the small-sized fuel-waste, known as breeze-coal, can be successfully burned in such a manner that the more complete combusto'n is obtained and the objeczo tionable formation of smoke is prevented.

The invention consists in the combination of elements by which the pressure of steam in the boiler is automatically maintained at a desired 'uniform degree. This is accomplished bymaintaining` the fire upon the grate by means of au automatically controlled forced draft and at the same time supplying to the fire-chamber an automatically-regulated .supply of air to accomplish complete 3o combustion in the fire-chamber'. The forced draft which delivers air below the grate and the auxiliary air-supply whichdelivers air into the fire-chamber above the grate coperate 'and are both automatically controlledv by the steam-pressure in the boiler, so that when the steam-pressure in the boiler falls below the desired degree the forced draft and supply of air below and above the grate will be automatically started, thus augmenting thel 4o fire and increasing the production of steam. When the steam-pressure inv the boiler rises to, the desired degree, the forced draft and supply of airfto the fire-chamber will be Achecked and the temperature of the fire will decline. The automatic regulation of the supply of steam from the boiler by means of regulatingthe chimney-draft or regulating y the area of anatural inlet-d raft is old, and this I do not claim; butI believe'it to be broadly 5o newwith meto automatically controla forcedv draft by the'riseandjfall of the steam-pres'- sure in the boiler and to automatically control both the supply of air delivered below the grate and the supply of air delivered above the grate bythe rise and fall of steampressure in the boiler.

The invention consists, further, of the combination,with a boiler-furnace having a grate, of a fire-bridge having a banking-platform in front, lines arranged in the upper part of the platform and the re-bridge, outlet-openings in the top of the iire-bridge,a hot-air-blast pipe passing through the base port-ion of the rebridge and banking-platform and through the rear walls of the furnace, a steam-blower iu the rear end of said blast-pipe, a suitable connection with the boiler for supplying steam to said blower, a damper located in an opening in the inner endof the blast-pipe adjacent to the ash-pit, and means for opening 7o or closing said damper, said opening in the hot-air-blast pipe supplying the air to the ues and outlet-openings of the fire-bridge.

The invention consists, further, of certain details of construction and combinations of parts, which will be more fully described hereinafter, and finally claimed.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section through my improved smoke-consuming furnace,the upper part ofthe boiler and the chimney being in side elevation, so as to show the connection and regulating device-for the supply of steam to the blower; and Figs. 2 and 3 are respectively a vertical transverse sec 85 tionon line 2 2, Fig. 1, and a horizontal sec'- tion on line 3 3,`Fig. l.

Similar letters of referenceindicate correspending parts.

^Referring to the drawings, A represents the grate of my improved smoke-consuming furnace, which is preferably composed of a suitable number of grate-bars having conical perforations through which the hot-air blast is supplied to. the fuel on the grate. The 95 grate-bars are supported on tubular bearingbars B, which extend transversely across the combustion-'chamber of the furnace. The fire and ash-pit doors at the front of the furnace are kept `tightly closed when the smallcoal waste is burned on the grate.

' Adjacent to the grate A lis arranged the iire- ICO Vbridge F and a banking-platform'F' in front of the same and behind the grate. The lower part or base ofthe lire-bridge and the bankingplatform are connected by a hot-air-blast pipe D with the rear wall of the furnace, said pipe passing out through the rear wall and being provided at its outer end with a steam-blower D', which is connected byastearn-supply pipe D2with thedome C ofthe boiler C. The front end of the hot-air-blast pipe D terminates in the ash-pit and supplies hot air under pressure to the ash-pit' and from the same through the openingsin the grate-bars to the fuel burning on the same. The steam-supply pipe D2 is provided with a stop-cock d2 at its front part in front of the front Wall of the furnace for establishing a connection with the steamdome C of the boiler or interrupting the same when no hot-air blast is required. The supply of steam to the blower is regulated automatically, so as to keep up the proper burningof thevfuel on the grate by means of a regulating-valve R in the supply-pipe D2, which" regulating-valve is opened or closed more or less by a weighted connection with theblower and damper regulator R', as shown in Fig. 1, said regulator beingl connected by a counterweighted wire rope W with the regulating-valve R and by a second counterweighted wire rope W with the damper R2, located in the chimney of the furnace. The blower anddamper regulator R is connected by a pipe P with the main steam-pipe of the boiler, a dirt-trap P and condensing-coil P2 being located in said 'pipe P. The automatic regulation of the supply of steam from the boiler and of the regulating-valve-and damper is well known; but the automatic regulation of the forced draft vby the steam-pressure and the balance of. the temperature of the tire against the steam-pressure I believe to be broadly new with me; but the mechanism is shown for the purpose of understanding the automatic regulation of the tire, as described later on. The supply-pipe D2 is conducted through one o`f the side walls of the furnace and superheatedyso as to form a su perheater for the steam and air supplied to the blowery of the blast-pipe.

In the banking-platform F and fire-bridge F are arranged heating-fines f, which extend from one side to the other of the bankingplatform and in vertical direction through the fire-bridge, the tire-bridge Hue communieating with rows of outlet-perforations f' in the front, top, and rear of the fire-bridge. The lower end of the heating-flue in the banking-platform F communicates with anbpening o in the top of the hot-air-blast pipe D,

through which opening hot air from the blastpipe is conducted into the flues fof the banking-platform and fire bridge, heated still more in its course through these flues, and is emitted in a highly-heated state through the perforations f' in the firebridge, s0 as to mingle with the gaseous products of combustion of the fuel on the grate and to enable them to burn in a. very complete and effective manner. In the opening o in the top of the air-blast pipe, which opening is located near the inner end of the same, is arranged a damper G, which is opened or closed by means of an oscillatory damper-rod g, that passes through the front wall of the bankingplatform and the front wall of the furnace, said rod being provided with a regulatingwheel g or the like at its outer end, so as to permit the opening and closing ofthe damper, as required.

In grates for burning small-coal waste the ashes are not dropped intothe ash-pit, but are drawn off through the front door of the hre-chamber, while the burning fuel is preferably banked up on the banking-platform F' and returned to the grate after thel ashes have been drawn off. It is necessary to supply hot-air blast to the fuel on the grate, so as to produce the completecombustion of the same. This blast has to be regulated, together with the steam-supply and the draft of the chimney, so as to produce a good ire on the grate. When the supply of hot air by the blower D' is interrupted by closing the steam-supply pipe, only sufficient quantity of air is drawn off by the grate, so as to keep the fire alive when no steam is to be made.

AAs soon as steam is to be made the hot-air blast is supplied to the grate, which is accomplished by opening the steam-supply pipe. The steam is then supplied to the blower D of the blast-pipe and through the same to the ash-pit, passing through the openings in the grate-bars, so as to produce the combustion of the fuel spread on the same. Simultaneously thehot-air blast passes into the flues f in the banking-platform and fire-bridge, so

that the air is heated up to still higher temperature and emitted withthe steam carried along and mixed with the gases of combustion that are conducted over the fire-bridge, so as to produce' by the intermingling with the hi ghly-heated products of combustion the thorough and eiective combustion of the same. When the pressure of steam in the boiler rises, the blower and damper regulator R is called into action, so as to operate the regulating-valve in the supply-pipe D2 and damper R2 in the chimney, so that the supply of steam to the blower D', as welLas the draft in the chimney, is diminished. Consequently a smaller quantity of hot air is supplied to the .fuel and tire-bridge. When the pressure of steam in the boiler falls below a certain limit,

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theregulator will again open the regulatingvvalve R, so as to supply a larger quantity of banking-platform and lire-bridge,the damper Gis closed, and therebyihe connection of the heating-hues interrupted, in which case the supply of hot air to the grate is continued and the supply of air through the openings in the fire-bridge discontinued. rlhis may be done when the steam has to be gradually discontinued. When, however, steam of high pressure and the generation of a large quantity of steam are desired, then the hot air is supplied to the grate-bar as well as to the fiues in the banking-platform and fire-bridge, so that a quick and energetic combustion of the -fuel and its gases takes place with little,

if any, formation of smoke, owing to the complete combustion of the fuel and the products of combustion of the same. The automatic regulation of the steam supplied to the blower and of the draft permits the fireman to give his whole attention to the proper supply of fuel to the grate, so that he can keep up the lire without giving any attention to the stea'msupply of the blower and draft of the furnace, which are automatically regulated by the blower and damper regulator. The furnace is greatly improved by the connection of the blast-pipe D with the grate and with thc heating-fines f in the banking-platform vand fire-bridge and the supply of fuel to the grate rendered-easy and regular,so that there-t by the burning of the cheap coal-waste in furnaces is facilitated and a great yield of steam at considerable less expense obtained, and at the same timethe smoke passing out of the chimney is almost entirely prevented.

I have described aconstruction which I believe to be effective to carry myin ven tion into practice; but I do not intend to limit myself lo any particular structure, but to claim broadly the regulation of steam-pressure in the boiler by automatically increasing or decreasing the forced draft delivered below the grate or the forced draft delivered below the grate and above the grate by any form of mechanism capable of producing this result under the influence of the fluctuation of steam-pressu re, the draft operating inversely as the Asteam-pressure.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with a closed combustion-chamber and ash-pit, of a\grate,a banking-platform having air-channels, a bridgewallhavin g air-channels which com municate 2. The combinationwith a closed combustion-chamber and ash-pit, of a grate, abanking-platform having air-channels, a bridgewall having air-channels which communicate with the channels of the banking-platform and receive air from the region vof the ashpit, the channels of the bridge-wall delivering air to the fire-chamber, a hot-air-blast pipe arranged within the fire-chamber, and heated thereby and delivering hot air under pressure to the ash-pit, a blower. delivering. yair under pressure to the hot-air-blast pipe,

means controlled by the boiler-pressure for automatically regulating the force of the said blower, and means for dividing the blast between the ash-pit and the fire-chamber.

3. The combination with a closed combustion-chamber and ash-pit, of a grate,a banking-platform having air-channels, a bridgewall having air-channels which communicate with the channels of the banking-platform and receive air from the region of the ashpitthe channels of the bridge-wall deliveringair to the fire-chamber, a hot-air-blast pipe arranged within the fire-chamber and heated thereby and delivering hot air under pressurf to the ashpit, a steaminjector blower delivering air under pressure to the hot-air-blast pipe, and means controlled by the boiler-pressure for automatically controlling the steam supplied to the injector, and means for dividing the blast between the ashpit and the fire-chamber. l

4. The combination, with a closed combustion-chamber and ash-pit, of a grate, a banking-platform and lire-bridge, a hot-air-blast pipe extending through the rear wall of the ber and ash-pit having closed doors, a gratein said combustion-chamber, a banking-platform and -tire-bridge adjacent to said grate, a hot-'air-blast pipe extending through the rear wall of the furnace and through the base of the banking-platform and tire-bridge into the ash-pit, a steam-blower at the rear end of the hot-air-blast pipe, a steam-supply .pipe

connecting the blower with the dome of the.

boiler, a regulating-valve in said steam-supply pipe, an automatic regulator for operating the valve, a damper in'the chimney of the furnace, also connected with the regulator for being automatically operated jointly with the regulating-valve, fines in the banking-platform and fire-bridge, outlet-openings in the top of the lire-bridge, an 'openingnear IOO furnace and the base of the fire-bridge and l lio the inner end of the hot-air-blast pipe com- I In testimony that', I claim the foregoing as mnnicating with the end of the hot-air flue my invention I have signed my name in presn the banking-platform, a damper in said ence of two subscribing witnesses. supply-opening of the blast-pipe, and means HENRY E. PARSON.

5 for opening or closing said damper from the Witnesses:

outside of the furnace, substantially as seb SIDNEY R. PERRY,

forth. I EMMA W. FINLAYSON.

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