US539729A - Muffled furnace - Google Patents

Description

(No Model.) 2 sheets-sheet 2.

F. J. FALDING.-

MUFFLED FURNACE.

No. 539,729. Patented May 21,18 95.

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BY 5 $4M ATT EIFNFLY.

UNITED I STATES PATENT EETCE.

FREDERIO JOHN FALDING, OF CLEVELAND, OHIO.

MUFFLED FURNACE.

SPECIFICATION forming part of Letters Patent No. 539,729, dated May 21, 1895.

Application filed August '7, 18 94.

a full, clear, and exact description of the invention, which will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to muffled furnaces,

and the invention consists in the construction of a muffle, the method of conducting the furnacegases around the muffie and to economize and utilize the heat radiated from the muffle to heat the furnace, by heating the air which goes to the furnace to supp'ortcombns tion, thereby saving the heat which Would otherwise escape or be carried away by radiation, all substantially as shown and described and particularly pointed out in the claims.

In the accompanying drawings, forming a part of the specification, Figure 1 is a longitudinal sectional elevation of a furnace constructed with my improvements and taken on a line corresponding to 1 1, Fig. 3. Fig. 2

is a cross-section on a line corresponding to lines a: at, Fig. 1, and 2 2, Fig. 3. Fig. 3 is a horizontal section on a line corresponding to line 3 3, Figs. 1 and 2.

In the drawings an application of the muffie in a sulphate of soda furnace is shown, and A represents the furnace proper, B the muffie, and O the usual pot at the side of the mnffie.

I lay no claim to novelty in the construction or arrangement of the pot in respect to the muffle, nor in the muffie itself in connection with or in its relation to the pot,bnt I do claim the muffie when modified and constructed as shown and described herein.

In all cases, so far as I am aware, muffied furnaces heretofore have been of an ordinary plain construction in so far as the top, bottom and sides were concerned, and there was no provision in them whereby the heat which was radiated therefrom was utilized for any purpose whatsoever. It followed therefore that there was an excessive and wasteful loss of heat because muffies necessarily require a Very high temperature to do their work. I

serial No. 519,670. (No model.)

have therefore improved the construction of the muffie so that the radiated heat at both its top and bottom is economized and saved and used over again through the furnace for heating the mnffie, as herein described. In this improved construction I employ a series of fines or tiles 2 arranged side by side over the muffie the full width and length thereof and opening at one end into the top of the furnace and at the other end into the rear wall 0, thereby forming the body of the muffle. Along the bottom of the muffie and forming the bottom thereof is another series of fines or tiles -3-, or their equivalent, running also the full length of the muffie and at their inner ends and near the furnace discharging into an open down passage or chamber in the back Wall of the furnace A and thence to the flue opening 5-- which leads to the chimney or smoke stack.

I The rear wall 0' of the muffie is formed with an internal passage 6 which connects the two sets of fines -2 and 3, and so it occurs that the heat and products of combustion enter the fines 2 from the top of the furnace A and, passing thence over the top of the muffie B, enter the rear vertical passage or channel -6, from which they take the return fiues3- along the bottom of "the muffie and pass thence into the discharge passage and fines -4t-- and 5 at the immediate rear of the furnace A.

Now, to preserve and utilize the heat, which obviously would be radiated from these top and bottom fines, I have constructed the walls of the furnace and muffie to adapt them .to receive top and bottom air fines 8 and 9. The topair fines 8 are built into the'rear wall D of the furnace A and commnnicate with an inlet passage -10 at the top thereof. The bottom air fines 9 are laid. along immediately beneath the bottom heat conveying fines 3- and dischargein'to the down passage having an outlet near the front of the furnace from the wall thereof beneath the fire grate. The rear-wall O of the muffie has a down passage 15 connecting the top air fines 8 with the bottom air fines 9-. Both sets of air fines -8 and -9 cover the entire width of the muffle and 0f the top and bottom fines -2 and -3, respectively, so that any heat that is radiated from said flues 2- and 3 unavoidably passes into the fiues -8- and 9 It thus occurs that whatever radiation of heat takes place from the fiues. 2- and 3 up or down must enter the air conveying fines 8 and 9 and the air in said fines being heated is carried to the furnace in a heated state, adding just that much to the heat of the furnace and besides promoting better combustion altogether and getting more heat out of the same quantity of coal than could be obtained if cold airWere used instead.

That I claim is 1. A muffle furnace consisting of a series of parallel tile heating-fines laid side by side and forming the top and bottom of the muflie respectively, and air fines for the furnace extending over the top and along immediately beneath the bottom of said heating fines, and the rear Wall of the muffle provided with a connecting passage for each set of flues, substantially as set forth.

2. In a muffie furnace, a heat passage from the top of the furnace and a parallel return passage beneath the muffle, a rear wall hav- 25 ing a passage connecting said passages, a series of parallel tubes extending full length over the said heat passage and along beneath I the return passage and a connecting passage at their rear, substantially as set forth.

3. The furnacehaving the outgoing heat passage formed by aseries of parallel earthen tubes -2- and a corresponding series of return tubes 3 beneath and the chamber between said sets of tubes and the rear wall having a common passage from one set of tubes to the other, in combination with the parallel air tubes 8 and 9 arranged over and under the said heat passages respectively, and the said tubes having a discharge into the furnace, substantially as set forth.

Witness my hand to the foregoing specification this 5th day of July, 189%.

,FREDERIG JOHN FALDING.

Witnesses:

H. A. FRANK, J. H. C. MOQUILKEN.

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