US1444918A - Heating furnace for ingots, billets, and the like - Google Patents

Description

Feb. 13, @2a 1,444,918

C.' W. HEPPENSTALL HEATING FURNACE FOR INGOTS, BILLETS, AND THE LIKE Filed Apr. 2l, 1921 2 Sheets-sheet 'l Wa [loess AND THE LIKE 1921 2 sheets-sheet 2 Feb. 13, A1923.

- C. W. HEPPENSTALL HEATING FURNACE FOR INGOTS1 BILLETS,

Filed Apr. 2l,

Nwmwvvf1 Q I T Patented lieb. li, lQZl.

NETE@ l Maisie rarest ortica.

HEATING FURNACE FOB INGOTS, IJBJLETS, AND v'IH LIKE.

Application filed April 21, 1921. Serial No, 463,213.

7 1o all 1.o wm t may conce/rn.'

Be it known that I, CHARLES W. Hnrrn-N- s'rALL, a. citizen of the United States, and residing in the city of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented or discovered the new, useful, and Improved Heat-ing Furnace for lngots, Billets, and the like, of which the following is a specification.

My invention consists of certain new and useful improvements in heating furnaces for ingots, billets, and the like, and it more par ticularly relates to fluid fuel, either gaseous or liquid.

My invention is characterized by new and improved means for preheating the air which is used in the fuel burners.

Preheating the air by means of checkerwork is well known in the art; two sets of checkerwork being provided, the hot being passed through one set to heat the same, while the air for the burners is heated by being passed through the other set.l

This arrangement requires careful attention,

for if the hot gases are left turned on forA too long a period, the brickwork is soon burned out and requires rebuilding. Moreover the temperature to which the air is preheated is not constant or uniform, as the (.lieckerwork cools rapidly after the ai!" is turned through it. This of course makes thc operation of the furnace irregularnnfl hard to control.

In my improved furnace no duplication of the air preheating mea-ns is required, nor is it necessary to have expensive valves and ilues. On the contrary the preheating mea-ns, which I provide. is in constant use while the furnace is in operation, and the tem peinture to which the air is preheated is kept uniform; thereby enabling vme to obtain the best results from the furn. e.

`Generally speaking my improved furnarie comprises a heating compartment on the floor of which are placed the ingots or billets. and into which the burners project the gas or oilv flames; a picheating compartment into which a portion of Vthe hot gases or products of combustion are admitted from the heating chamber, and an air chamber in the upper part of the prcheating compartment and to which chamber the air is supplied to be heated, under constant pressure, and from which the air is fed to the burners.

Other novel features'of Construction, and of arrangement of parts will appear from the following description.

In the accompanying drawings, which are, however, merely intended to illustrate a practical embodiment of the principles of my invention without vlimiting the scope thereof to the construction shown, Fig l. is a vertical longitudinal'section of a heating furnace embodying the principles of my inl vention taken along the line I-I in Fig.` 3; Fig. 2 is a vertical section taken along the line H-II in Fig. l; Fig. 3 is a horizontal section taken along the irregular `line lII-llI in Fig. l, and Fig. 4 isA avertical section taken along the V--lV in Figz. a

The following is a. detailed description of the drawings.

The furnace is composed of two main compartments included between the` side walls l. The. front compartment A, in which the ingots or billets are heated, is separated from the rear compartment B by means of the wall The floor 3 of the furnace preferably extends through the two compartments'. 4 repy resents one or more arched ports below or in` the wall 2 connecting the two compartments preferably at or near their bottoms.' 5 is the roof of the compartmentA, and 6 is the ver tically sliding door which forms the front closure for the heating vchamber A. l

C is a1 closed :airgchamber in the upper part of the'compartment' I show the same in the form of a steel tank which spans said compartment transversely, its ends resting in the side walls l which are built up around and above the tank. The front and rear walls of the compartment B are preferably reduced in thickness, as at 6"l to insure free passage for the hot gases up around the sides of the tank C. The top closure of the compartment B. vwhich isv spaced well above the tank C. is shown in the form of a Vreili'ractor;v tile and 8 represents one or more relatively small ports for the escape of the hot gases from compartment B.

9 is an air-supply pipe, connected to a blower or other source of compressed air, not shown, and leading down through the closure 7 to the top of the tank C, and l() represents the airl supply pipes leading from either end of the tank C to the air passages of the fuel burners D which project into `irregular line ports ll in the side walls of the heating coinpartinent A. One of said lnirnersf` is preferably near the front of the compartment A, While the other is near the longitudinal center oli' the compartment, as indicated in Fi 3.

. rl`he escape for the lmajor portion of the hot `rases from the compartment A is through the ports 12 in the front sides of said compartment connecting with the vertical fines i3, ,which conn/etat their lower ends with the cross flue lll, which in turn connects with the stack flue l5.

y .t is evident that when the furnace is in operation a portion of the hot gases will pass rearwardly through the port fl into the coinpartment B, rising` up around the tank C and filling the crown ,of the compartment B, thus thoreughlyand uniformlyheating -said tank. The escape of the hot gases from the compartment B is retarded by the limited Cereeity @f the small Ports 8- es a result the air, under the proper pressure, maintained by the blower, Will be supplied at a uniform temperature `to the burners, and the teinperatureof the heating compartment A is thus kept at the proper deheating of the air accomplished by means of a single, automatically operating mechanism,` there is no danger of fluctuations of furnace temperature owing to the neglect of the operator, and thus the best and inost uniform results are obtainable.

lily iniproved air-preheating mechanism. is much less expensive to build and maintain than the checkerwork now in general use, and When repairs are necessary, the same can be made in much less time and with much less expense.

Thepercentage of the hot gases or products lof combustion admitted from the compartment A to the compartmei'it `B may be varied. l have obtained excellent results in practice by permitting all of the hot gases from the chamber A to enter the chamber B.

What l desire to claim is l. In a heath-1p,` furnace of the character described, the combination of a heatingl coinpartmcnt, fiuid fuel burners projecting` into said compartment, a second compartment communicating,` With said. heating compartn'ient to receive hot gases therefrom, a 4closed `chamber supported in the upper portion of said second compartment connected to a supply of air under pressure, said second com pertinent being provided above said closed chamber with relatively small ports for the 'escape ofthe hot gases into the atmospherej and pipes connecting said closed chamber With said burners, for the purpose described.

2. In a. heating furnace of the character described, the combination of avheating compartment, fluid fuel burners (ilisrharging into said heating compartment, a second compartment lcommuni ating` with the heating couipartnient 'to receive hot `rases therefrom, an enclosed chamber Within said second named compartment connected to a supply of air under pressure, pipes connecting said closed chamber with said burners, and a choked escape for the gases from the second named compartment.

Signed at Pittsburgh, Pa., this 19th day of April, 192i.

CHARLES lV. HEPPENSTALL.

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