US903511A - Ingot-heating furnace. - Google Patents

Description

P. SCHMIDT & A. DESGRAZ.

INGOT HEATING FURNACE.

APPLICATION FILED JULY 16, 1907.

V 4 a m2 2 {Q Patented Nov. 10, 1908.

, AnoLrnn Because, a citizen of Switzerland,

our invention.

- out in the claim.

PAUL SCHMIDT AND ADOLPHE DESGRAZ, OF HANOVER, GERMANY.

incur-marine summon.

Specification of Letters Patent.

Patented Nov. 10, 1908.

Application and July 16, 1907 seri l na asa'iav.

To ullwhom it concern: l Be it known that we, PAUL Sonnm'r, a

subject of the Emperor of Germany, and

residing at Hanover, Germany, have invented certain new and useful Improvements in bigot-Heating Furnaces, of which the following is a specification.

This invention relates to furnaces for heating large ingots or blocks of metal and its object is to produce a furnace inwhich a number of large ingots may be heated thoroughly and without injury in suificient uantities to su ply the demands of the I rol g mill or ot er plant and in which cooling of the furnace and excessive consumption of fuel will be avoided,

The invention consists in certain novel features of the furnace illustrated in the accomanying drawings as will be hereinafter first fully described and then particularly pointed v the drawings, Figure 1 is a longitudinal sect1on,Fig. 2 a transverse section, and Fig. 3 a horizontal section of a furnace embodymg The hearth roper of the furnace is divided into any suitable number of chambers, a, b, c, d, e, the wallsv between which are provided close to the bottom and just above the hearth with apertures 9 through which the waste gases can pass from one chamber to. another. In the bottom of the hearth there are arranged a number of stone ridges h which support the ingots and thus enable the wastegases to circulate beneath them. Instead of these ridges, several loose stones may be placed upon the hearth. The front of each chamber is provided with a door 71, and each chamber is provided with a separate adjustable gas supply. The gas passes from the gas supply pipe Kc by any of the separateregw atin va ves Z, the ascending assages m, the istributing channels m w 'ch are ar-, ranged upon the furnace crown, and finally throu h the various inlet nozzles 97. in. the arches crown of the furnace into theseparate chambers. The waste gases escapeat' both sides of the furnace and pass through the fines o and 0 into the regenerators p andv p. The gases escaping on each side 0 the furnace' are consequently provided with a seriarate regenerator having a separate out at passage g or g' furnisheri with arelgulating valve '1 or 1*. Each regenerator is a so separately supplied with air which enters N the I ,but small.

passages s and 8 arranged at the two front ends of the furnace in a highly heated condi tion and passes thence into the collecting chamber "6 arranged on the rear wall, where it is still further heated. From this chamber theair is suppliedseparately and in adjustable quantities to the different chambers passing b means of the apertures w, which are provi ed for each chamber and which can be regulated by means of the slides a, into the intermediate spaces, a between the double arches and from thence through larger mixing nozzles n, which are-arranged beneath the nozzles a, into the furnace, being meanwhile intimately m'ixed with the gas.

The method of operating the furnace is as follows: In the case in Whichthe furnace has been just constructed or'has been entirely out of Work, some of the chambers, for instance, a, b and c, are filled with ingots some hours before the beginning of the shift, the

heaviest ingot being referably put intothe central chamber 0 am the lightest ingots into the outer chamber a. The slide 1 is then opened to permit of the escape of the Waste gases-through the flue 0 the slide 1' meanwhile remaming closed. By means of the regulating device the supply of gas is so regulated that the maximum amount of gas and a corresponding amount of air passes into the central chamber. 0, while the chamber 1) is supplied with a correspondingly smaller amount of gas and the chamber a with no gas at all, provided the ingots placed therein are As the waste gases of all the three chambers pass away in the first instance through 0 they will be forced to pass throu h the apertures arran ed in the partition Wa ls f from chamber to c amber, passing thereby to a large extent beneath the ingots and giving up to them a large portion of'their heat which hitherto has been lost. The supply of gas to the side chambers from above is con with the result that the waste gases will now o'cks thorillQ - time the ingot in chamber 0 will likewise be hot blocks. When the ingots in chamber a,

have been allworked up, this chamber is at once again filledand morewaste gas is caused to pass through, 0 The same process is reeated when all the blocks in chamber b have een used up and the chamber has again been filled with new ingots, the only difierencebein that now again there is supplied a suitable amount of air-and gas mixture. By this ready to be Withdrawn. After this chamber has also again been charged, the Waste ases thereof are first caused to escapethroug 0 while the ingots in the chambers d and e, which in the meantime have become hot, are Withdrawn. The furnace'will now be in regular working order and is alternately emptied chamber by chamber from one side or the other and again charged. The newly inserted cold ingots cannotpossibly affect the already heated ingots as the hot partition walls f act as insulators or buffers and at the same time, by means of the heat stored in them, assist in the heating of the ingots. By heating each chamber separately to a greater or less extent and by varyin the direction of flow of the waste gases from c amber to cham ber, the furnace may be operated in various different ways, for instance, only one, or two, or three chambers may be used, without consuming a relatively larger amount of coal. The furnace is moreover suitable for ingots of all sizes, from the largest down to the smallest.

The furnace satisfies therefore all the above-mentioned conditions in the most satisfactory manner. It'perrnits of the gradual heating ofvthe heavy ingots, it insuresan absolutely uniform heating of the in ots 1 throughout asthe ingots are surrounde on all sides, above as well as beneath, by, the heating" gases, and finally it makes continuousworking possible. I The manner in which 7 the furnace 1s operated, -moreover,rreduces the wasteuofiron to the smallest amount as the ingots are subjects to the greatest heat in the order in which they are Withdrawn and areconsequently not exposed to this heat longer than is absolutely necesossible 5o sary, a factwhich explains without further remark the small coal consumption of the furnace.

Having now particularly described and as;

certained tthe nature of ourisaid invention and in what manner thesame 1s to be per- An ingot-heating furnace having, a plurality of heating-chambers, means for supply ing gas to the chambers, means for causing the gas'to travel successively throughflqthe chambers, a regenerator, a passage leading from the end chamber to the regenerator,

and an outlet from the regenerator 'common.

to all the chambers.

In testimony whereof-We have hereunto f set our hands inpresence of two subscribing Witnesses. I PAUL SCHMIDT ADOLPHE, DESGRAZ." I

Witnesses: PAUL R. THOMPSON, ROBERT V. BULON.

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