# US 2014/0193758 A1 · Method for burner and burner device

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- Number: US 2014/0193758 A1
- Document ID: US20140193758A1
- Status: Published application
- Kind: A1
- Application number: 14/206,128
- Filed: 2014-03-12
- Published: 2014-07-10
- Earliest claimed: 2007-12-10
- Assignees: Aga AB
- Applicants: Aga AB
- Inventors: Tomas EKMAN; Anders LUGNET
- Web page: https://patentgrep.com/patent/US20140193758A1

## CPC

- F23L 7/007: {Supplying oxygen or oxygen-enriched air}
- F23D 14/32: using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air (F23D14/38 takes precedence)
- F23D 14/66: Preheating the combustion air or gas
- F23L 9/00: Passages or apertures for delivering secondary air for completing combustion of fuel (baffles or deflectors in air inlets F23M9/02)
- F23L 15/02: Arrangements of regenerators
- F23L 15/04: Arrangements of recuperators
- Y02E 20/34: Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
- F23L: SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ({air-supply arrangements for fluent fuels F23C;} firebridges with means for feeding air or steam F23M3/04; baffles or shields with air supply passages F23M9/04); VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS {(dampers and throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24)}; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23D: BURNERS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Burner device (2) for an industrial furnace (1) comprising a channel (3) for fuel, a channel (4) for a first oxidant, an outlet (9) for flue gases, a control device (10) and a heat buffer (7), where the first oxidant and the flue gases alternating are led through the heat buffer (7). The invention is characterized in that a separate lancing device (6) is arranged to supply a second oxidant to the burner device (2).

## Claims

### Claim 1

A method for increasing efficiency when heating an industrial furnace using a burner device comprising a first channel (3) for fuel, a second channel (4) for a first oxidant, the second channel (4) for the first oxidant being i) separate from the first channel (3) for the fuel, and ii) outside of the channel (3) for the fuel, an outlet (9) for flue gases, a control device (10), and a heat buffer (7), the method comprising the steps of:
supplying the fuel through the first channel;
alternatingly leading the first oxidant and the flue gases, in a gas flow direction toward the burner device, through the heat buffer and from the heat buffer through the second channel to the burner device; and
supplying a second oxidant, comprised of at least 80 percentages by weight oxygen, via a separate lancing device to the burner device through the second channel, the second oxidant being supplied at a velocity which is at least sonic velocity, so that an ejector effect is created downstream of the heat buffer in relation to the gas flow direction towards the burner device, such that a flow of preheated oxidant is increased, and
wherein the lancing of the second oxidant is supplied in the first channel for the first oxidant but not in the channel for the fuel.

### Claim 2 (depends on 1)

The method of claim 1, wherein, the control device controls an amount of the lanced secondary oxidant over time, so that different amounts of the lanced secondary oxidant are respectively provided during corresponding different heating stages of the furnace.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the burner device batch wise heats metal material in the industrial furnace.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the first oxidant is air.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the second oxidant is comprised of at least 95 percentages by weight oxygen.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the lancing device supplies the second oxidant in the first channel for the first oxidant at a velocity above 200 m/s.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the control device controls the supply of the second oxidant continuously during operation.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the control device controls the supply of the second oxidant using an on/off procedure.

### Claim 9 (depends on 3)

The method (2) of claim 3, wherein during heating of the metal material in the industrial furnace, the second oxidant is supplied during a first heating step where the average supply per time unit of the second oxidant thereafter is completely or partially decreased during a second temperature homogenising step.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the lancing of the second oxidant at the sonic velocity creates the ejector effect reducing pressure downstream of the heat buffer in the gas flow direction.

### Claim 11 (depends on 1)

The burner device according to claim 1, wherein the ejector effect takes place in the second channel but not in the first channel.

### Claim 12 (depends on 6)

The burner device according to claim 6, wherein the ejector effect takes place in the second channel but not in the first channel.

### Claim 13 (depends on 10)

The burner device according to claim 10, wherein the ejector effect takes place in the second channel but not in the first channel.