US443354A - Steam-generator - Google Patents

Description

J. J VBURWELL. STEAM GENBRATUR.

Patented Dee. 23, 1890.

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WITNESSES //MM v WZ MMM UNITED STATES PATENT OFFICE.

JOHN J. BURVELL, OF COVINGTON, KENTUCKY.

STEAM-GENERATOR.

SPECIFICATION forming part 0f Letters Patent No. 443,354, dated December 23, 1890.

Application filed April 8, 1890. Serial No. 347,065. (No model.)

To all whom it may concern:

Be it known that I, JOHN J. BURWELL, of Covington, in the county of Kenton and State of Kentucky, have invented anew and useful Improvement in Steam-Generators, which improvement is fully set forth in the following specilication and accompanying drawings, in whichi Figure I is a vertical longitudinal section of a locomotive-boiler provided with my improved device; Fig. 2, a vertical cross-section of the same on line 0c in Fig. 1, and Fig. 3 a vertical cross-section on line y y in Fig. 1.

My invention relates to improvements in steam-generators of the class generally used in connection with locomotive-engines. My object is to provide a simple and practical device, whereby a more thorough combustion of the fuel is secured, the lues and their connections rendered more durable, alarger heating-surface obtained without increasing the size or number of the flues, a decreased gratesurface, and a consequent saving of fuel and labor, together with immunity from destructive fires caused by sparks from the smokestack.

My invention consists in dividing the lines into three groups or sections and arranging the groups in a vertical series with intermediate regenerative chambers between the sections, Whereby the gases are replenished by the admission of a suitable supply of air during their passage from one series of liues to another. By this plan the heat necessarily traverses the body of water thrice instead of only once, as in boilers constructed in the usual manner.

Referring t0 the accompanying drawings, A designates the shell of a locomotiveboiler; B, the fire-box, from which the names pass into the upper group of fines O, and thence into the chamber D, which is provided with an apertureE for the admission of oxygen, the supply of which is regulated by a suitable valve having a connecting-rod or other appliance (not shown) extending to the cab. The heat, being thus replenished, passes through the middle group of iiues F and into the second regenerative chamber G, where it receives an additional supply of oxygen through thevalve H. The lowest group of Iiues I receives and conveys the products of combustion into the smoke-box J, where it meets the exhaust and is discharged through the smoke-stackin the usual manner. If preferred, the lowest group of flues may extend only to the dotted line K; but if the construction of the boiler should permit, it is desirable that they be extended forward, as shown in the drawings.

The operation of the device will now be explained. XVhen the flames pass through the upper group of lues and reach the chamberD, the natural upward tendency of the heat temporarily retards the current. The surplus carbon is thus permitted to intermingle with the oxygen admitted by the valve E. The flame is thus re-enforced and enters the middle group of flues and passes into the second regenerative chamber G,`where the re-enforcing process is repeated with an important additional advantage. It is a well-known fact that a large portion of fuel is wasted in boilers having only one set of fines. Unconsumed fragments of coke are carried through by the force-draft and thrown out of the smokestack. Bridges and other valuable property are thereby ignited and destroyed. In order to obviate such danger and secure complete combustion, the second chamber G extends downward below the plane of the lowest group of flues and forms a pocket. The draft being partially checked by the admission of air, as hereinbefore described, the particles of carbon or coke fall into the receptacle and are consumed, and the additional heat thus produced is utilized by the adjacent waterspaces M M. The ashes and other residuum may be removed through the trap-door L.

It is furthermore understood that in ordinary boilers, which have no means of distributing the heat uniformly, the tubes are liable to buckle and spring leaks, especially when the heat is irst applied. In this device the heating process is necessarily more gradual and uniform, and the tubes are not subjected to sudden and unequal strains.

l. A steam-generator of the locomotive type having the regenerative chambers D and G, the latter at the rear of the fire-box and its heat utilized by the adjacent waterchambers M M, and both of said chambers provided with apertures for the admission of IOO nir, in combination with horizontal liues arranged in th rec Verticallydisposed grou ps und communicating, as described, with said chambers und with the smokesteck, :is and for the purposes seb forth.

2. In combination with the Iirebox B and the regeneraitive-chnmber G :1t the rem', surrounded, as described, by the water-spaces M M, the group of pipes C, Rund I, regenerative chem bers D und G, suitable provision being made for the admission of air to the said chambers I) and G, substentin'lly :is set forth.

In a steam-boiler as described, the channbcr Gut the rear of the iire-bCX, having` adjzv cent lthereto the water chambers or spaces ill M and extending down to form :L pocket, und having therein :L valve by which snid pocket can bc cleaned, substzintinllyns set forth.

4. In n steam-boiler, a chamber at the rear of the IireboX, with which the tlucs carrying the smoke und other products of combustion communicate, extending below the said lues so as to form e pocket for cinders, the., and provided with a valved opening` by which it can be cleaned out, uli as und for the purposes Set forth.

In testimony that I claim the foregoing I have hereunto set my hand, this lst luy of April, 1890, in the presence of witnesses.

JOIIN J'. BURWELL.

V"itnesses:

SAMUEL 11` i nSY'rHn, R. MILLAP..

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