WO1999061839A1 - A boiler arrangement and a method of burning oil - Google Patents
A boiler arrangement and a method of burning oil Download PDFInfo
- Publication number
- WO1999061839A1 WO1999061839A1 PCT/SE1999/000890 SE9900890W WO9961839A1 WO 1999061839 A1 WO1999061839 A1 WO 1999061839A1 SE 9900890 W SE9900890 W SE 9900890W WO 9961839 A1 WO9961839 A1 WO 9961839A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flue gas
- air
- fan
- burner
- conduit
- Prior art date
Links
- 239000003921 oils Substances 0.000 title claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000003546 flue gases Substances 0.000 claims abstract description 41
- 239000003570 air Substances 0.000 claims abstract description 31
- 238000002485 combustion reactions Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000203 mixtures Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims 1
- 239000004152 Nitrogen oxides Substances 0.000 abstract description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical class 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O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052813 nitrogen oxides Inorganic materials 0.000 abstract description 6
- 230000003134 recirculating Effects 0.000 description 2
- 229910002089 NOx Inorganic materials 0.000 description 1
- 210000002445 Nipples Anatomy 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910002091 carbon monoxides Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gases Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000007789 gases Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003345 natural gases Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/001—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space spraying nozzle combined with forced draft fan in one unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/09002—Specific devices inducing or forcing flue gas recirculation
Abstract
A boiler (11) has a conventional oil burner (12). Flue gas is recirculated from the stack to the burner and mixed with atmospheric air to form the combustion air. Subpressure is provided in the fan (22, 31) of the burner and the flue gas is drawn into the fan and mixed with the air in the fan. The flue gas is cooled in a cooler (16) before being mixed with the air. The emission of nitrogen oxides will be extremely low.
Description
A boiler arrangement and a method of burning oil Field of invention
This invention relates to a method of burning oil by atomising it and burning it with air and recirculated flue gas. It relates also to a boiler arrangement
Background of the invention and prior art
The flue gas from conventional oil burners is normally very clean today as to the amount of carbon monoxide, hydrocarbons, and flue dust. The content of nitrogen oxides (NOxor NOX), however, is usually still high. GB-B 1 464 169 describes a method for reducing air pollution agents in the flue gas. Particularly, a method is described that reduces the amount of the nitrogen oxides by recirculating flue gas. A small amount of the air is mixed with recirculated flue gas but most of the combustion air is added at various points without being mixed with flue gas. This method makes the apparatus very complicated and probably also difficult to adjust.
GB-A 2 259 567 describes a method for reducing the amount of nitrogen oxides in a natural gas burner by recirculating flue gas and mixing it with the combustion air before ejecting it in the burner. The flue gas is additionally heated before the mixing.
Object of invention
It is an object of the invention to reduce the nitrogen oxides in a simple and safe way that can be applied to a simple conventional oil burner.
Brief description of the invention
The recirculated flue gas and the air are mixed to a combustion air that comprises at least 80% of the total mass flow of combustion air. The flue gas is cooled before being mixed with the air. The cooling doubles the effect of the flue gas recirculation. Preferably, the flue gas is sucked into a mixing chamber for flue gas and air. This mixing chamber can be an inlet chamber in a fan housing so that the air and flue gas mix in the fan.
Brief description of the drawings
Figure 1 is a side view of a boiler with an oil burner. Figure 2 is a fragmentary front view seen as indicated by the arrows 2-2 in figure 1 and partly in section.
Figure 3 is a section through a somewhat modified burner. Figure 4 shows enlarged a detail from fig 3. Figure 5 is a section through another modified burner.
Detailed description of preferred embodiments
Figure 1 shows a boiler 1 1 with a conventional oil burner 12. A conduit 13 lead from the stack 14 to the burner 12 and there is a cooler 16 in the conduit 13 for cooling the flue gas that is recirculated from the stack to the burner 12. There is also a valve 17 in the conduit 13, by which the flow of recirculated flue gas can be adjusted.
Figure 2 shows the burner 12 on a larger scale. It comprises an electric motor 20 which has a shaft 21 that rotates a rotor 22 of a fan and the rotor of an oil pump 23. The fan housing has been denoted by 31. The conduit 13 leads to the interior of the fan rotor 22 and ends with a funnel 24. The inlet for atmospheric air is through a housing 25 with a non-illustrated valve by which the inlet area for air can be adjusted. Since the air inlet is restricted, there will be a reduced pressure inside the fan rotor which sucks flue gas through the conduit 13 so that air and a minor amount of flue gas will mix in the fan and form the combustion air. The amount of flue gas can be adjusted by the valve 17. Normally, there should be 10-20 % flue gas by weight in the combustion gas. A secondary burning may be arranged, but at least 80% of the total of the atmospheric air should be supplied as this primary combustion air.
Figure 3 shows the burner in a section and it shows the atomising nozzle 27 and the high- pressure tube 28 that lead from the oil pump 23 to the nozzle 27. At the very front end of the burner, there is also a turbulator 29 that gives the combustion air a swirling motion. In this figure, the flue gas inlet has been modified from the one in figures 1 and 2, and it is indicated by numeral 30 in the figure. The modified inlet 30 is shown on a larger scale in figure 4. The conduit 13 leads to holes 32,33 in the fan housing 31 and vanes 34,35 make an ejector that draws flue gas into the fan housing. Fig 4 shows still another way of drawing the flue gas through the conduit 13 and into the burner. On the pressure side of the fan, there is an annular ejector 36. The ejector 36 has an annular inlet chamber 37 with an inlet nipple 38 to which the conduit 13 is to be coupled. In this modified design, the tube 39 form a mixing chamber for the atmospheric air and the flue gas. In the designs according to figure 2 and 3, the fan housing 31 forms the mixing chamber.
Normally, about 15 % of the flue gas is recirculated and the recirculated gas should be cooled in the cooler 16 to as low a temperature as possible since the emission of nitrogen oxides will be lower the lower the temperature is. The temperature should preferably not exceed 50 C. A normal temperature of 30-40 °C can be reached when a non-expensive and simple cooler is used.
Claims
1. A method of burning oil by atomising the oil and burning it with air and recirculated flue gas, characterised in that the flue gas is cooled and the air and the recirculated flue gas are then mixed to a combustion air that comprises at least 80 % by weight of the total mass flow of combustion air.
2. A method according to claim 1 , characterised in that the flue gas is sucked into a mixing chamber (31,39) for air and recirculated flue gas.
3. A method according to claim 2, characterised in that atmospheric air and the flue gas is sucked into a fan (22,31) so that the air and the flue gas mix in the fan.
4. A method according to any one of the preceding claims, characterised in that the flue gas is cooled to a temperature below 50 ┬░C.
5. A boiler arrangement comprising a boiler (11), a stack (14) from the boiler, an oil burner (12), and a conduit (13,16,17) from the stack to the burner for recirculation of flue gas, characterised by a cooler (16) in the conduit (13,16.17) for cooling the flue gas.
6. A boiler arrangement according to claim 5, characterised in that the oil burner comprises a high pressure oil pump, a nozzle for atomising the high pressure oil from the pump, and a fan for blowing combustion air to pass around the nozzle.
7. A boiler arrangement according to claim 6, characterised in that the conduit (13,16,17) for flue gas ends in a sub-pressure area in the fan so that the flue gas is drawn through the conduit (13,16,17). A boiler arrangement according to claim 6, characterised by an ejector (36) in a passageway in the burner downstream of the fan, to which the flue gas conduit (13,16,17) is coupled.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9801840-1 | 1998-05-25 | ||
| SE9801840A SE9801840L (en) | 1998-05-26 | 1998-05-26 | Automatic NOx reduction |
| SE9900664A SE9900664D0 (en) | 1999-02-21 | 1999-02-21 | NOx ejector |
| SE9900664-5 | 1999-02-21 | ||
| SE9901114A SE9901114D0 (en) | 1999-03-24 | 1999-03-24 | Reduction of Nox |
| SE9901114-0 | 1999-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999061839A1 true WO1999061839A1 (en) | 1999-12-02 |
Family
ID=27355924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1999/000890 WO1999061839A1 (en) | 1998-05-25 | 1999-05-25 | A boiler arrangement and a method of burning oil |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1999061839A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017068407A1 (en) * | 2015-10-19 | 2017-04-27 | Bertelli & Partners S.R.L. | Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler using flue gas recirculation and according boiler |
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| US718554A (en) * | 1902-06-14 | 1903-01-13 | William George Waring | Method of extracting zinc. |
| GB1464169A (en) * | 1974-01-11 | 1977-02-09 | Aqua Chem Inc | Pollutatnt reduction with selective gas stack recirculation |
| US4023921A (en) * | 1975-11-24 | 1977-05-17 | Electric Power Research Institute | Oil burner for NOx emission control |
| EP0384277A2 (en) * | 1989-02-24 | 1990-08-29 | HEIMAX Heizkessel GmbH | Method and combustion installation for the reduction of nitrogen oxide formation during the combustion of fossil fuels |
| US5092761A (en) * | 1990-11-19 | 1992-03-03 | Exxon Chemical Patents Inc. | Flue gas recirculation for NOx reduction in premix burners |
| GB2259567A (en) * | 1991-09-11 | 1993-03-17 | Mark Iv Transportation Tech | Boiler with low NOX combustion of gaseous fuels |
| US5413477A (en) * | 1992-10-16 | 1995-05-09 | Gas Research Institute | Staged air, low NOX burner with internal recuperative flue gas recirculation |
| EP0687854A1 (en) * | 1994-06-13 | 1995-12-20 | N.V. Acotech S.A. | Burner with recirculation of exhaust gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US718554A (en) * | 1902-06-14 | 1903-01-13 | William George Waring | Method of extracting zinc. |
| GB1464169A (en) * | 1974-01-11 | 1977-02-09 | Aqua Chem Inc | Pollutatnt reduction with selective gas stack recirculation |
| US4023921A (en) * | 1975-11-24 | 1977-05-17 | Electric Power Research Institute | Oil burner for NOx emission control |
| EP0384277A2 (en) * | 1989-02-24 | 1990-08-29 | HEIMAX Heizkessel GmbH | Method and combustion installation for the reduction of nitrogen oxide formation during the combustion of fossil fuels |
| US5092761A (en) * | 1990-11-19 | 1992-03-03 | Exxon Chemical Patents Inc. | Flue gas recirculation for NOx reduction in premix burners |
| GB2259567A (en) * | 1991-09-11 | 1993-03-17 | Mark Iv Transportation Tech | Boiler with low NOX combustion of gaseous fuels |
| US5413477A (en) * | 1992-10-16 | 1995-05-09 | Gas Research Institute | Staged air, low NOX burner with internal recuperative flue gas recirculation |
| EP0687854A1 (en) * | 1994-06-13 | 1995-12-20 | N.V. Acotech S.A. | Burner with recirculation of exhaust gas |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017068407A1 (en) * | 2015-10-19 | 2017-04-27 | Bertelli & Partners S.R.L. | Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler using flue gas recirculation and according boiler |
| EA036581B1 (en) * | 2015-10-19 | 2020-11-26 | Бертелли Энд Партнерс С.Р.Л. | Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler and boiler so obtained |
| US10851991B2 (en) | 2015-10-19 | 2020-12-01 | Bertelli & Partners S.R.L. | Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler and boiler so obtained |
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