US1067040A - Gas-fired melting-furnace. - Google Patents

Description

W. G. KRANZ.

GAS FIRED MBLTING PURNAGE.

APPLICATION FILED 001216, 1508.

Patented July 8, 1913.

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WITNESSES W. G. KRANZ.

GAS PIRED MBLTING FURNAGE. APPLICATION IILIID 00T. I', 100s.

Patented July 8, 1913 4 SHEETS-SHEET 2.

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W. G. KRANZ.

GAS FIRED MELTING PURNAGE. APPLIoATloN FILED o0T.1, 1908.

l 067,040. Patented July 8, 1913.

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WILLIAM G. KRANZ, OF SHARON,`PENNSYLVANIA, .ASSIGNOR TO THE NATIONAL MAL- LEABLE CASTINGS COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

GAS-FIRED MELTING-FURNACE.

Specification of Letters Patent.

Patented July 8, 1913.

Application filed October 1G, 1908. Serial No. 458,053.

To all lwhom t may concern:

Be it known that I, lVILhIAM G. Kama, of Sharon, in the county of Mercer and State of Pennsylvania, have invented a new and useful Improvement in Gas-Fired M elting-l1`urnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, in which- Figure l is a vertical longitudinal section of a furmtce constructed ill-accordance with my invention; Fig. 2 is a horizontal section partly in plan view on thexirregular line II-ll ol' Fig. 1; Fig. 3 is a vertical section on the line III-lll of Figs. 1, 2 and 6; Fig. Ll is a lvertical section on the line IV#- IV of Figs. 1, 2 and 6; Fig. 5 is a vertical section on the`liI1eV-V of Figs. l and 2; and Fig. (S is af vertical section on the `line VI-VI of Fig. 3.y

The purpose of m invention is to provide a furnace for tie eflieient melting of pig iron foruse in the manufacture of malleable castings, which operation must be carried on with uniformity, so as to produce a refuilar and uniform product of castings, and for this reason a proper construction ot' furnace is of great importance. My furnace has proved very eheient for these pu`rposes.

In the drawings, 22 represents the hearth ont the meltingr furnace havinga reverber: tory roof 8, as shown, and fl is a gas producer chamber, which huilt directly at the front end ofl the furnace, with its discharge flue 5 discharging the gases directly linto the furnace throat.

6 is the hopper of the producer, and 7 are the blower-pipes. At the rear end of the furnace between the end of the hearth and the stack flue 8 is a recuperator chamber i), divided by vertical partition Vl0 into two or more subchambers 9 and 9, through which the waste gases from the furnace pass rially on their way to the stack as indicated by dotted arrows in Fig. l. 'In this recuperator are a series of transverse llnes preteraloly, built of tile. I show them arranged in four series 11, 11', 11a and ll, which communicate at their ends with passages 12, l2 and 12l at one end of the recuperator and 12b and 12d at the opposite end of the recuperator. These passages are sepa' ratedfroln each other by -the vertical partition 10 and the horizontal partitions 13,

lf3a and lil", so that thc air which is admitted through the inlet 14. into the chamber l2 passes to the chamber 12" through the recupcrating [lues l1, thence to the passage l2 through the recuperatlng lilies ll', thence to the passage 1Q at the other end of the recupcratorthrough the recuperating lues l1, and thence similarly through the recupcrating lilies ll", thence downwardly through the passage l2" into an air liuc lil, by which it is conducted to the air inlet ports 15, and emerging fromsaid ports-v the now heated air mixes with the producer gases from the producer port 5 and sup ports the combustion thereof.

As the air is expanded in its passage through the reeuperator lines, l. prefer to make the groups ol.E tlues successively larger or greater `in number. Thus, in the group l1, l show live tlucs; in the group 11, six tlu'cs; in the group 1l, sevcn'llucs; and in the group 1lb, ten llucs. These lines being highly heated by the waste gases passing through the recuperator on their way to the stack, give up.thc heat to the air, which is thus delivered to the 'furnace in a heated condition and enhances the combustion ot the producer gas. l am enabled in this way to run the furnace with much less lucl than heretofore, and also to produce more uniform heating etl'ect than has heretofore been possible in the operation ot such furnaces.

The construction is very compact and con-v he obtained from the ordinary coal-iired reverberatory furnace, and at a ,less cost of lmelting than with an open hearth furnace.

By reconstructing the furnace with rccuperator chambers and using gaseous fuel l get a furnace which gives more intenso heat than a reverbcratory coal-fired furnace, costs less to construct than theopen hearth furnace and will afford much of the elliclency which can be had otherwise only with the open hearth. Where coal is burned'directly in a reverberatory lurnace the 1ron cannot be brought to the proper temperairon not. only with the open hearth furnace,

ture without skimming 0H the slag and subjecting the iron to a hot flame under forced draft. This endangers the quality of the because of the rapidly oxidizing nature of the flame, but also because the strong blast conveys a large amount of sulfur and ash from the coal to the iron, the iron not being protected by the slag. In the use of my furnace so'intense is theheat and so uniformly distributed over the surface of the iron, that the slag can be left on the iron as a protection from the sulfur contained in the flame until the iron is all tapped "out of the furnace, and yet the iron can be properly reduced and brought to a proper state of fluidity in as short a time as in a reverberatory furnace Where the slagis skimmed off.

With my furnace a manufacturer can re tain approximately the same melting capacity as with the coal-tired reverberatory furnace, and distribute the furnaces in the same way, and get the beneiits of the open hearth furnace With a furnace costing less to build and easier to operate, and in one respect get a result which could not be obtained In the open hearth 'the gas is reversed from time to time during the refining process so as to heat the incoming gas and air by means of the checker work whieh'has been heated by the outgoing burning gases, but as long as the gas and air are entering through the chamber on one side that chamber is being cooled .otl' and whenI the gas is again reversed it starts. through the other chamber at its maximum temperature, so that the temperature of the incoming gas and air fluctnates considerably. In my furnace the air is heated by continuously passing through `the same series of fines and is gradually increased in tenipcrature from the start until it reaches its maximum, and is not subject to the fluctuations of the open hearth'. This is advantageousvin giving uniformity to the molten metal produced by the furnace. An-

located adjacent to t-he stack other advantage in this furnace over the oldA yversa much more readily and accurately,

than in the reverberatory furnace.

lVithin the scope of my invention, as dened in the claim, modifications may be made, since what I claim is A .gas-fired melting furnace having a recuperator chamber beyond its eXit end and between the furnace and the stack, a transverse partition wall extending upwardly Within the .recuperator chamber toward its upper end to give the gases up and down passes therethrough, a plurality of passages atl each' end of the recuperator chamberl separated from each other, groups yof air ilues extending transversely through the recuperator compartments, the first group being and the last group being located adjacent to the opening froin the furnace to the recuperating chamber, the passages and groups of lues being arranged to give the air aserial passage through successive groups of the lues, land a return passage for the heated air leading rearwardly to the gas inlet-end of nace, the successive groups of air ilues being arranged to give increased area to the flowof air.

In testimony whereof, I have hereunto set. my hand. y

WILLIAM G. KRANZ. Witnesses i Tnoiu as W BAKmvnLL II. M. Corwin.

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