US1769678A - Open-hearth-furnace port - Google Patents

Description

July 1, 1930. e. DANF'ORTH, JR

OPEN HEARTH FURNACE PORT Filed July 10. 1922 2 Sheets-Sheet l July 1, 1930. G. DANFORTH, JR 3 9 7 OPEN HEARTH FURNACE PORT Filed July 10 1922 2 Sheets-Sheet 2 Patented July 1, 1930 UNITED "STATES oEoneE 1.. mmron'rn, .13., 0E CHICAGO,

PATENT, OFFICE rumors, nssrenoa, BY MEsN'E Assmn- MEN'I'S, TO OPEN HEARTH COMBUSTION COMPANY, CHICAGO, ILLINOIS, A COR- rona'rron or. DELAWARE.

OPEN-HEARTH-FURNACE PORT Application filed July 10,

This invention relates to a new and improved'open hearth port .-construction and more particularly to the construction of such ports and their assdciate passages and dampers for controlling flow from the ports to the furnace chamber. e

As is well known in the art, open hearth furnaces are double ended and are reversed in operation, each end serving alternately to introduce the fuel and air and to carry ofi the products of combustion. The products of combustion largely exceed in volume the incoming air and fuel and consequently the ports must be designed with a view of carrying oil the larger volume of the products of combustion. It is, however, necessary for eflicient operation that the incoming airand fuel be properly intermingled and con trolled to form a relatively short, fhot flame properly directed upon the bath of metal in the furnace. I

Certain furnaces have been designed with damper controlled ports upon each end of the furnace, these ports being closed off upon the incoming end and serving on the outgoing end to aid in carrying off the products of... combustion. .A furnace of this type is shown in the patent to McKune, No. 1,339,855, dated May 11, 1920. In these furnaces, two dampers are required, one in each of the supplemental discharge passages, and these dampers not only complicate the installation but due to their water-cooling, involve considerable heat losses.

It is desirable in open hearth furnaces to separate the incoming fuel at each 'end of the furnace into avplurality of small streams since the small streams will more readily mix with the air and will give a more re id combustion. Another advantage of divi ed streams lies in their greater efiiciency in thecharge and will be d melting down a charge. A single central flame will be broken up b 'im inging upon efiected to the walls and roof. This results not only in ineflicient heating but in damage to the furnace walls, and roof. ;.On the other hand the divided streams will meet upon the piled up charge and will efiiciently melt it down. In t e construction of separate ports the furnace the slag pocket is connected by 1922. Serial N0. 573,867.

side walls may be utilized as port walls so that but little additional brickwork is required over a single port furnace.

It is an object of the present invention to provide a new and improved port construction wherein the fuel is introduced in a plurality of streams and wherein the. fuel streams are. partially surrounded by the air stream.

It is an additional object to provide fuel ports located adjacent the side walls of the furnace and the air port located intermediate and above the fuel ports.

-. It is an additional object to provide ports of this-character in which the furnace side walls serve to form one side of the fuel ports.

It is a further object to rovide a construction of this type in whic the side walls and roof are inclined inwardly toward the port ends and thereafter inclined outwardly to form an approximate Venturi section.

- It is another object to provideina furnace having a plurality of ports, a centrally located damper between the ports and the ,fumace proper, the damper being movable into and out of position.

Other and further objects will appear as the description proceeds.

I have shown a preferred embodiment of the invention in the accompanying drawings,

in which- Figure 1 is a verticalsection showing one end of a furnace constructed according to the present invention;

taken on line 4-4 of Figure 2.

The furnace com rises the slag pocket 7 from which leads t e air uptake 8 opening into the air port 9 located on the center line of the furnace; It will be understood that usual. pas sa s to suitable regenerators m a manner wiii known in the art. The slag pocket 10 is connected by uptakes 11 and 11 with lateral gas ports 12 and 12. As shown in the drawngs, the several ports are water-cooled by pipes 13. The side wall 14 of the furnace is provided with an inwardly inclined portion 15 located approximately at the discharge opening from ports 9, 12 and 12.

-As clearly shown in Figure 1, the furnace roof 16 slopes downwardly to this point and then upwardly so that the roof together with the sides forms approximately a Venturi section. The damper 17 is provided with the water-cooled frame 18 and is movable upwardly through water-cooled guides 19 into the housing 20.

In the operation, of the furnace, upon the incoming end, the fuel gas will be heated in suitableregenerators and led from them to the slag pocket 10. From the slag pocket 10, it will pass through uptakes 11 and 11 to ports '12 and 12. Each of these ports will thus discharge a stream of gas, the streams being directed inwardly toward the center line of the furnace.

The incoming air is preheated in the usual regenerators and passes through slag pocket 7 to the uptake 8. From the uptake 8 it passes out through air port 9. This port9 extends between the two gas pgrts and also above them as shown in Figure 4. Figure 4 also shows clearly how the outer walls of thel as ports are formed by the outer furnace wa s.

The damper 1"! is lowered to the position in which it is shown in Figure 1 and it thus serves to split the air into two streams which are directed toward the lateral gas streams. This deflection of the air serves to cause it to more rapidly intermingle with the gas and the'relatively small passage area between each side of the damper 17 and the adjacent, inwardly inclined portion 15 of the furnace wall forms a relatively restricted port adapted to discharge a short, properly controlled flame. Upon the outgoingend of the furnace, the damper 17 is drawn up into the housing '20 and the full area of the air port and the two gas ports is available to carry off the products of combustion. These products of combustion are led from the slag pocket 7 to the usual regenerator.

But one form of construction under my invention has been shown by way of illustration and it is to be understood that it is capable of various other embodiments such as come within the scope of the appended claims.

I claim:

1. In a reversible regenerative furnace. a plurality of separate fuel ports located adjacent the side walls-of the furnace, the side walls being inclined inwardly toward the port ends and thereafter inclined outwardly to form an approximate Venturi section, and

an air uptakelocated on a line intermediate said ports.

2. In a reversible regenerativefurnace, a plurality of separate fuel ports located adports and an air port located intermediate I the lateral gas ports and extending above such ports.

4. In a reversible regenerative furnace, air

and gas ports in the. furnace ends, and a damper located centrally in each furnace and between the ports and furnace chamber.

5. In a reversible regenerative furnace, air and gas ports in the furnace ends, and a damper located centrally in each furnace and between the ports and furnace chamber, the damper being of less width than the furnace and afi'ording port area upon either sidethereof when in its lower posit-ion.

6. In a reversible regenerative furnace, lateral ports, a central port, and a damper spaced from said ports and movable into position in front of said central port to deflect flow therethrough toward the flow from the side ports.

7. In a reversible regenerativefurnace, lateral gas ports, a central air port, and a damper movable in front of the air port to deflect the air stream into the lateral gas streams.

8. In a reversible regenerative furnace, air and gas ports in the furnace ends, and a damper located centrally in each furnace and between the ports and furnace chamber, and means adapted to move the damper vertically through the roof of the furnace.

9. In a regenerative furnace having an air port and a gas port at each end thereof, the gas port extending on an angle to the air port so as to discharge gas across the flow of air from the air port, slide valvesfor control-

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