US746240A - Slag-heated boiler. - Google Patents

Description

No. 746,240. PATENTED DB0. s, 190s.k

' R. BAGGALBY. SLAG HEATED BOILER.

APPLICATION FILED FEB,14, 1903.

UNITED STATES Patented. December 8, 1903.

V*PATENT OFFICE.

RALPH BAGGALEY, OF PITTSBURG, PENNSYLVANIA.

vSLAG-HEATH: BOILER.

SPECIFICATION forming part of Letters Patent'No. 746,240, dated December 8,-1903. Application filed February 14, 1903. Serial No. 143,389. (No model.)

To all whom it #my concern: Be it known that I, RALPH BAGGALEY, of

Pittsburg, in the county of Allegheny andV State of Pennsylvania, have invented a'new and useful Slag-Heated Boiler, of which the following isa full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification,`

in which- Figure 1 is a side elevation, partly in vertical section, illustrating my invention. Fig.

2 is a sectional view showinga modified con-- struction of the means for effecting the discharge of the slag from the molds. Fig. 3 is a side elevation, partlyin vertical section,show

` ing modified apparatus for coating'the molds before they are supplied with slag.`

I am aware that heretofore patents'have,

been granted in which ithas been proposed to discharge moltenslag lfrom smelting-furnaces upon a traveling platform and to convey it through the shell of a steam-boiler; but so far as I know such boilers lhave never been put into use and the plans proposed have been inherently defective. I

The purpose of my invention is to provide an efficient boiler in which the defects of prior constructions are not present; and it consists in the combination, with a boiler, of a slagconveyer which is arranged to travel through a heating-chamber which is external to the heating-surface of the boiler, but in proximity thereto,the boiler being provided with flues o1" 'passages through which the hot gases of the slag and the air which is heated by the slag can pass,'the boiler being thus heated not only by'direct radiation, but also by the gas and air, which derive heat from the incandescent slag and transmit it to the boiler.

The invention also consists in other features described below and summarized in Ythe claims.

In the drawings I show my invention applied to a horizontal boiler of the fire-tube type; but with suitable modicationsit can be appliedto water-tube boilers and boilersof other design.

2 is the boiler-shell, traversed by tubes 3 and having a stack LL, provided with the usual damper 5.

Beneath the boiler -shell and extending nearly from end to end thereof is a substantially closedv heating-chamber 6, which communicates with the vrear end of the tubes- 3 and is otherwise preferably closed except for openings 7 at the ends, through which passes Y the upper branch of an endless chain carry- .ing a series of open trough-shape molds 8,

the lower branch of the chain passing through a water-tank 9 below the boiler.

l() 10 are sprocket-wheels over which the chain passes, and ll isa spout outside the" chamber adapted to supply molten slag to the they are coated with a refractory wash of lime,

clay, or the like mixed with water. The means shown in Figpl for this purpose consists of a tank 13, containing themixture and provided with a revolving shaft 14, carrying flexible arms 15,0f cloth or rubber. The shaft is rotated at a faster rate than the endless chain of molds, so that the arms l5, whichtravel above and below the surface of the mixture, give several wiping strokes to the surface of each mold as it passes, and thus coat'it with the wash. The revolving arms also keep the mixture in the required state of agitation. The purpose of thus coating the molds is to protect them from injury by the slag and to prevent the slag from sticking tothem.

.In the modified apparatus shown in Fig. 3 the tank 14', which contains the refractory Wash, is provided with a rotating paddle 15',

discharge-pipe 16, which yterminates n-an ejector-nozzle 17, directed toward the molds. A pipe 18 discharges compressed air or steam into the nozzle and causes the refractory wash to be discharged in a spray upon the surface of the molds.

In using the boi-ler the series of molds 8 is Y driven by power applied to one of the wheels l10 and is caused to travel inthe direction of the arrow. Molten slag'is deliveredto the molds as they pass the lspout ll, being taken either directly from a smeltiug -furna'ce or from an intermediate ladle or receiver. y The slag-filled molds pass through the chamber 6 below the boiler, and thus present to the which keeps the mixture agitated, and has a rec boiler a hot radiant mass as wide as the boiler and nearly as 1ong,wl1ich rapidly heats the water and causes the generation of steam. The hot gases from the slag and the air which enters the chamber through the openings 'aud is heated by contact with the hot surface of the slag on the upper side of the molds and by contact with the hot surface of the molds on the under side pass through the fines 3 into the stack, their flow through the stack being regulated by the damper to the rate best adapted to insure the most efticient heating of the boiler. The boiler is thus heated by direct radiation from the hot slag and by convection of heat by the gases and air which pass from the slag and from the hot molds through the boiler-fines.

When the molds pass from the rear end of the chamber 6, the slag which they contain Will have been solidified, and when they pass over the rear sprocketI 10 and into the watertank the sudden chilling of the slag Will canse it to disintegrate and the particles will drop upon a conveyer 19, which carries them ont of the tank to a car or dumping-place. The molds thence travel through from the tank, past the coating apparatus 13, and under the slag-spout.

When the boiler is used iu localities having an abundant supply ot' water, I may substitute for the tank 9 a pipe 20, Fig. 2, which discharges a stream of water upon the molds after they have emerged from the chamber 6, and thus causes the slag to disintegrate and to drop upon the conveyer 19.

My apparatus renders the operation of the boiler entirely mechanical, and as it provides for the efficient utilization of the slag, which heretofore has been Wasted, it eects a great economy in the working of a smelter plant.

The skilled mechanic will be able to modify the apparatus in various Ways without de pai-ture from my invention, since l. A slag-heated boiler having a substantially closed heating-chamber external to the heating-surface, a slag-carrier exposed on its upper and lower surface to the air in the chamber, means for causing the carrier to traverse the chamber, and means for supplying the carrierwith molten slag, said boiler having a Hue or fines extending from the chamber along the healingsnrface to a staclo opening for the passage of the heated air and gases from the carrier and from the slag, whereby the boiler is heated by radiation and convection; substantially as described.

2. A slag-heated boiler having a substantially closed heating-chamber external to the heating-surface, a series ot' molds having disconnected mold-cavities and exposed on their u pper and lowersu rfaces to the air in the chamber, means for causing said molds to traverse the chamber, means lor supplying slag thereto, and means for cooling and coating the molds, said boilerhaving a flue or fines extending from the chamber along the heatingsurface to a stack-opening for the passage of the heated air and gases from the molds and from the slag; substantially as described.

In testimony whereof I have hereunto set my hand.

RALPH BAGGALEY.

Witnesses:

Gno. B. BLEMING, H. M. CORWIN.

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