US1769493A - Open-hearth-furnace port - Google Patents

Description

G. L. DANFORTH, JR 1,769,493

OPEN HEARTH FURNACE PORT July 1, 19306 Original Filed Oct. 9, 1922 Patented July it, EQBO pastas stares parser oFFm GEORGE L. DANFORT H, JR, OF CHICAGO, ILLINOIS, ASSIGNORTO OPEN HEARTH COH- BUSTION COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE orau-nmarn-ronn'ncn roar Application filed October 9, 1922, Serial No. 593,276. Renewed April 11, 1980.

This invention relates to a new and improved open hearth furnace port construction and more particularly to a construction of this character provided with a plurality of 6 ports upon each end of the furnace.

As is well known in the art, open hearth furnaces aredouble ended and are reversed in operation, each end serving alternately to introduce the fuel and air and to carry off 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 carry-' ing off the larger volume of the products of combustion. It is, however, necessary for efficient operation'that the incoming air and fuel be properly intermingled and controlled to form a relatively short, hot flame properly directed upon the bath of metal in thefurnace.

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 only complicate the installation but due to their water-cooling involve considerable heat losses.

It is desirable in open hearth furnaces to furnace into a plurality of small streams since the small streams will more readily mix, with the air and will give a more rapid combustion. Another advantage of divided streams lies in their greater efficiency in melting. down a charge. A single central flame will be broken up by impinging upon the charge and will be deflected 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 the construction of separate ports the furnace side walls may be utilized as port dischargepassages, and these dampers not separate the incoming fuel at each end of the 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 open hearth port construction comprising a plurality of ports at each end of the furnace, certain of the ports being associated with air and as passages and additional discharge ports eing provided.

It is a further object to provide a construction of this character in which the air streams are directed through the individual ports and in which they straddle the fuel streams.

It is also an object to provide a construction of this character in which the auxiliary discharge ports connect the hearth to the incoming air passages and in which said auxilie ary ports are damper controlled.

Other and further objects will appear as the description proceeds.

I have illustrated a preferred embodiment of my invention in the accompanying drawings, in which- Figure 1 is a vertical longitudinal section of one end of a furnace constructed according 76 to my invention; a

Figure 2 is a horizontal half section taken on line 2-2 of Figure 1; and v t Figure 3 is a horizontal half section taken on line 3-3 of Figure 1. T

Referring to the drawings, the ports 6 lead to the furnace hearth 7, being inclined in'- wardly toward the centerline of the furnace. The rear end of these ports is enlarged at 8 and joins the chamber 9. I The vertical passages 10 connect the chamber 9 and the air slag pocket 11. The gas slag pocket 12 is con-, nected by upstakes13 to the elbows 14. These elbows ]Ol1'l the gas ports 15 which extend through the chamber 9 and into the rear portion 8 of the ports 6. As shown in'the drawing, the elbow 14 is provided with the watercooled shell/16 and the inner refractory lining 17. The ports 15 are provided with the water-cooled shell 18 and with the refractory 95 lining 19 and are (covered by the refractory material 20.

The upper portion of the chamber 9 is nnected to the hearth 7 by the passage 21 whibli extends-substantially the full width of the dles t e fuel port '15 and mingles with the fuel in the ports 6. The fuel comes in through suitable re enerators to slag pocket 12 and passes up t rough passa es 13 and elbows 14 to the fuel ports 15. On issuing from the fuel port-s, it is straddled by and mingled with rected flame.

the air stream as has been stated. The; ports 6 are so designed and pro ortioned as to give an adequately controlle and properly di- Upon the outgoing end of the furnace, the

damper 22 is raised-and the products of combustion may pass directl through passage 21 to the upper end of the c amber 9, and thence through passages .10-and sla pocket 11 to the regenerators. A portion 0 the products of combustion will enter the ports 6 and this portion will a ain be divided, a part of it passing around the gas ports to the chamber 9 while the remainder enters the gas ports and passes down through'the gas slag pocket to the gasregenerators. r

vThe water-cooled elbows 14 are subjected to considerable erosion by the heated prodnets of combustion and are consequently lined with refractory material. They are, however, made removable so that they may be replaced without the necessity of tearing down anycportion of the furnace. The form of construction shown'makes it possible toin- Y troduce the flame through comparatively smallports which are deslgned to properly intermin'gle and direct the air and gas streams. At the same'time, the provision of v ,the damper controlled passages permits. the

products of combustion to be 'carried off with- 3 out the use of auxiliary draft producing appliances. 1 I One specific'emb'odimenthas been shown! by way of example, but my construction may be modified to adapt'it to varying conditions I- claim I 1.- In an open hearth regenerative furnace, a plurality ofseparated ports at each end of within the scope of the appended claims.

the furnace, gasand air passages connected with'saidports, and a damper controlled dis- I charge port located above said ports.

2 In an open hearth regenerative furnace, a plurality of separated ports at each end of the furnace, gas andair passages connected with said ports, and a damper controlled discharge port located above said pgats, said discharge port being connected to said air passages.

3. In an open hearth regenerative furnace a plurality of separated ports at each end 0 the furnace, a fuel passage terminating adjacent' each such port, an air passa e overlying the end of each fuel passage, t e com.- bined fuel and air stream being directed toward the port, and-a. discharge port located adjacent said ports.

4:. In an open hearth regenerative furnace, a plurality of separated ports at each end of the furnace, a fuel passage terminating adjacent each such port, an air passage straddlin the end of each fuel passage, the combine fuel and air stream being directed toward the port, and a damper controlled discharge passage located above said ports.

5. n an open hearth regenerative furnace, a pair of ports at each end of the furnace, a chamber in the rear of each pair of ports communicatin with said ports, air passages leading to sai chamber, and a gas passage extending throu h said chamber'into the rear of each of sai ports.

.6. In an open hearth regenerative furnace, a pair of ports at each end of the furnace, a chamber in the rear of each pair of ports communicating with said ports, air passages leading to said chamber, a gas passage extending through said chamber into the rearv of each of said ports, and an auxiliary discharge passage connecting the furnace hearth with'each chamber.

7. In an open hearthregenerative furnace, a pair of ports at each end of the furnace,- a chamber in the rear of each pair. of ports communicating with said ports, air passages leading to said chamber, a gas passage extending through said chamber into the rear of each of said ports, and an auxiliary dis charge passage located above each pair of ports and connecting the furnace hearth and the chambers.

8. In an'open' hearth regenerative furnace, a pair of orts at each end of the furnace, a

chamber in the rear of each pair of ports communicating with said ports, air passages leading to said chamber, a gas passage extendin through said chamber into the rear of-eac of said ports, and a damper controlledauxiliary discharge assage located aboveeach pair of ports an connecting the furnace hearth and the chambers. I

Signed at Chicago, Illinois, this 4th day of October, 1922.

GEORGE L. DANFORTH, JR.

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