US1501532A - Furnace - Google Patents

Description

FURNACE N. F. EGLER Filed Oct. 16, 1922 july l5 1924.

.iv is, i924.

STATES NICKOLAS F. FSGLER, OF rCHICAGO, ILLINOIS.

FUR'NAOE.

Application-filed October 16, 1922. Serial No. 594,773.

To all who/mJ t may concern.'

Be it known that I, NIoKoLAs F. EGLER, a citizen of the United States, residi at Chicago, in the county of Cook and tate of Illinois, have invented a new and use-l io in ful Improvement in Furnaces, of which the following is a specification.

This invention relates to furnaces and is particularly adapted to be used on reversopen-hearth steel furnaces although it wi l be readily understood that it is equally adapted for use in continuous heating furnaces. The invention is fully described in the following specification and shown in `16 the. accompanying drawings in Which- Figure 1 shows a vertical longitudinal cross section of one end of an open hearth furnace embodying the invention, and

Figure 2 is a similar view of a modified 20 form of the invention.

This furnace comprises a hearth 10, a roof 11, and a mixing port 12 which communicates through` an air duet 13 which if desired may lead to any well known type of air re enerator.

Exten ing into the back of the mixing port 12 is a fuel mixing pipe or nozzle 14 which communicates with a source of oil supply through the pipe 15V and with a M source of combustible gas supply through the pipe 16. These pipes are preferably under substantially the same pressure and are controlled by the valves 17 and 18 respectively.

t In operation, air is supplied tothe air duct 13 and oil or the like to the pipe 15. Producer gas, coke oven gas, or the like is brought into the mixing nozzle 14 and serves to spray the oil or powdered fuel into the furnace chamber. With the pressure in the two pipes 15 and 16 substantially equal, there is no tendency for the pressure in the nozzle to back urp into either pipe and cut off flow therethrough.

Heretofore it has been customary to use compressed air or steam for spraying fuel oil into the furnace with the result that when the furnace is not up to the full melting temperature, the air or steam tends to retard ignition and combustion of the oil. As a resul-t some of the unburned products are carried throughv the furnace and are deposited on the walls of the checkerwork of the regenerator (not shown). This is true even though in some cases fuel gas vis also fed into the chamber along side the fuel oil.

By using fuel gas for spraying or atomizing the fuel oil an intimate mixture of the two is obtained. The gas readily mixes with the air in the port 12, and burns thereby igniting the fuel oil and producing its early combustion in the furnace chamber.

In Fig. 2 is shown a form of nozzle adapted for the use of powdered fuel. In this form powdered fuel is fed through the pipe 19 under a slight pressure to the larger pipe 20 when 'it is caught by fuel gas under pressure issuing from the pipe 21 and blown into the mixing port 12a when it mixes with air from the air duct 13a. It is not desirable. to use much pressure on the powdered fuel and hence the outlet 20 must be larger to prevent the higher pressure in the pipe 21 from backing up against the powdered fuel and preventing its passage into the mixing tube 20.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes therefore,` in the construction and arrangement may be made without departing from the spirit and scope ofthe invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in view of the prior art.

What I claim as new and desire to secure by Letters Patent is:

1. The process of operating a reversing open hearth furnace consisting of supplying air to the mixing port, supplying liquid fuel under pressure to a point adjacent said mixing port, supplying a combustible gas under pressure to said point, mixing the gas and liquid fuelin a confined space, and spray ing and directing the mixture into said mixing port.

l 2. The process of operatingl a furnace consisting of supplying air to t e mixing port, supplying liquid fuel under pressure to a point adjacent said mixing port, supplyin Ya combustible gas under pressure to sai point, mixing the gas and liquid fuel in a tube, and spraying and directing the mixture into said mixing port the pressures of the as andl liquid fuel being substantially equal.

3. In a furnace, a mixin port, an air duct leading thereto, a nozzle irected into said mixing port, means for supplying combustible oil under pressure to said nozzle, and

means for mixing a combustible gas With-A said oil Within said nozzle so that the gas serves to atomize the oil and to direct it into the mixing port, said nozzle being located entirely outside said mixing chamber.

4. In a furnace, a mixing port, an air duct leading thereto', a nozzle directed into said mixing port and being located outside the same, means for suppl ing combustible oil under pressure to said7 nozzle, means for supplying a combustible gas to said nozzle so that the gas serves to atomize the oil. and means for varying the proportions of gas and oil.

5. In a furnace, a mixing port, an air duct leading thereto, a mixing tube directed toward said port, means for discharging a 'fuel gas under pressure into said tube, and means for feeding fuel to said tube so that the gas will cause the fuel t0 be sprayed into saidport.

6. The process of operating a furnace con- Leonesa sisting of supplying preheated air to the mixing port, supplying liquid fuel under pressure to a point adjacent said mixing port, supplying a combustible gas under pressure tto said point, mixing the gas and liquid fuel in a confined space, and spraying and directing the mixture into said furnace.

7. In a reversing open hearth furnace, a mixing port, an air duct conductin reheated air thereto, a nozzle directe into said mixin port, means for supplying com.

bustible oi under pressure to said nozzle, and means for mixing a combustible gas with said oil within said nozzle so that the gas serves to atomize the oil and to direct the mixture into the mixing port.

8. The process of operating a furnace consisting of supplying air to the mixing port, supplying fuelv under pressure to a point adjacent said mixing port, supplying a combustible gas under ressure to said point, mixing the gas and fuel in a confined space, and spraying and directing theemixture into said mixing port.

N ICKOLAS F. EGLER.

Images