# US 4,392,815 A · Burner for bottom fired furnace

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- Number: US 4,392,815 A
- Document ID: US4392815A
- Status: Granted
- Kind: A
- Application number: 06/234,911
- Filed: 1981-02-17
- Granted: 1983-07-12
- Earliest claimed: 1980-07-17
- Assignees: Kawasaki Steel Corporation
- Inventors: Minoru Matsuzaki; Toshiei Kawauchi; Tsugio Murakami; Hideo Kishira
- Web page: https://patentgrep.com/patent/US4392815A

## CPC

- F23C 5/00: Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus (F23C1/00, F23C15/00 take precedence)
- C21D 9/70: Furnaces for ingots, i.e. soaking pits
- F23D 14/48: Nozzles
- Y02P 10/20: Recycling
- F23C: METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN {A CARRIER GAS OR} AIR (burners F23D)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- F23D: BURNERS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A burner for a bottom fired, ingot heating furnace producing faster and more even heating with lower fuel consumption is disclosed. The burner includes a plurality, preferably three, upstanding nozzles having nozzle ports directed at essentially a right angle to a radial line extending from the burner center. This orientation imparts a circular swirling action of the combustion gases which produces faster and more even heating of ingots contained within the furnace. The nozzle is arranged with a nozzle cap which shields the entire nozzle top from debris falling from the furnace roof resulting in a greatly extended service life.

## Claims

### Claim 1

A burner for a bottom fired, ingot heating furnace having a burner port through the bottom of said furnace, and comprising:
a gas header centrally disposed relative to a central axis of said burner port such that air is supplied to said burner port around said header;
plural gas nozzles arranged atop of and in communication with said header and equi-angularly arranged about said burner port central axis, each of said nozzles comprising a generally vertical conduit portion terminating in a head cover portion having a nozzle port such that gas is supplied to said burner port from said nozzle port along a direction generally defineable by a gas supply axis intersecting a plane perpendicular to said central axis at an angle, said gas supply axis being generally tangential to a circle contained within said plane and having a radius extending from said central axis to an apex of said angle; and
said head cover portion comprising a shield for the top of said conduit portion and said nozzle port, such that articles falling from said furnace are prevented from clogging said nozzle port;
whereby said gas is caused to flow helically and diffuse and mix with said air to provide a short flame.

### Claim 2 (depends on 1)

A burner as in claim 1, wherein said angle is in a range of about 45 degrees to about 60 degrees.

### Claim 3 (depends on 1)

A burner as in claim 1, wherein said angle is in a range of less than 60 degrees to about 45 degrees.

### Claim 4 (depends on 1)

The burner of claim 1 wherein said angle is about 60 degrees.

### Claim 5 (depends on 1)

The burner of claim 1 wherein said gas nozzles are three in number.

### Claim 6 (depends on 1)

The burner of claim 1 wherein said nozzles are constructed from a refractory alloy.