EP2281149A2 - Nouveau dispositif de controle du profil radial de la temperature d'une veine gazeuse - Google Patents
Nouveau dispositif de controle du profil radial de la temperature d'une veine gazeuseInfo
- Publication number
- EP2281149A2 EP2281149A2 EP09745913A EP09745913A EP2281149A2 EP 2281149 A2 EP2281149 A2 EP 2281149A2 EP 09745913 A EP09745913 A EP 09745913A EP 09745913 A EP09745913 A EP 09745913A EP 2281149 A2 EP2281149 A2 EP 2281149A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- diameter
- gas stream
- duct
- burner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
- F23C3/006—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion
-
- 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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
- F23C7/04—Disposition of air supply not passing through burner to obtain maximum heat transfer to wall of combustion chamber
-
- 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
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- 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
- F23C2203/00—Flame cooling methods otherwise than by staging or recirculation
- F23C2203/30—Injection of tempering fluids
-
- 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
- F23C2900/03005—Burners with an internal combustion chamber, e.g. for obtaining an increased heat release, a high speed jet flame or being used for starting the combustion
Definitions
- the present invention relates to a device for controlling the temperature of a gas stream, the gas stream constituting a hot fluid resulting for example from a combustion, and intended, after cooling, to be used as heat transfer fluid in a downstream exchanger of the present device.
- the downstream exchanger is not part of the present invention and may be of any type.
- the device according to the invention makes it possible at the same time to reduce the temperature of the gas stream while respecting a given radial profile of temperature.
- the device according to the invention can, for example, be placed along a flue gas circuit, and can deliver a gas stream at a reduced temperature and having a radial profile of temperature as homogeneous as possible over its entire section. .
- the device according to the invention is applicable to flue gas at a temperature up to 2500 0 C and generally between 1000 0 C and 2500 ° C, it is desired to bring to a temperature below 1000 0 C in a perfectly homogeneous manner, that is to say with a radial profile of said temperature which is "flat" in any section of the gas stream.
- This problem of radial homogeneity is complex because the hot gaseous vein, for example resulting from a combustion carried out by means of a burner, generally has a radial profile of temperature marked by large differences between the temperature at the center of the vein and the temperature at the periphery of said vein. According to the technology of the burner used and the flow regime, most often turbulent, it is not uncommon to observe temperatures in the center of the gas vein close to 2500 0 C, and temperatures around 1500 0 C.
- the first objective achieved by the present invention is to lower the temperature of a "hot" gas stream available at a temperature of between 1000 ° C. and 2500 ° C. and which may exhibit radial temperature heterogeneities at a level below 1000. 0 C, more particularly less than 700 ° C in a given time of less than 1 second, and so that the resulting gas stream, said "cold" vein is characterized by a radial profile temperature as homogeneous as possible.
- the device also makes it possible to provide at the level of the walls of the present device in contact with the gaseous vein to be treated, an area within which the temperature of the said gaseous vein is always less than that of the periphery of said vein, and if possible less than 500 ° C., which makes it possible to carry out most or all of said device in an inexpensive metallurgy.
- this second objective is to some extent antagonistic with the first, since it is ultimately a gaseous vein having a homogeneous radial profile, while the second objective is to achieve the entire crossing of the device by the gas stream, a radial profile of the latter, characterized by a cold wall zone (less than 500 0 C), while the central zone can reach temperatures of 1500 0 C, this in order to protect the device walls of excessive temperatures.
- the present device thus makes it possible to solve a problem that can be defined by two objectives, the first objective consisting in producing a profile having a cold wall area at the crossing of the device and the second consisting in producing, at the output of said device, a profile. "flat", both objectives to be achieved by respecting a total residence time of less than 1 second.
- US Pat. No. 7,018,435 B1 describes a device in which the fuel is injected near the wall around an oxidant jet so as to ensure a good oxidant / fuel mixture before entering the reaction section, in this case a catalytic oxidation reaction.
- this invention is not intended to control the temperature of the enclosure in which the oxidation takes place.
- the central flow is not rotated.
- the present invention provides a set of specific ratios for defining the overall geometry of the device so as to achieve the two aforementioned objectives.
- FIG. 1 gives a schematic representation of the device according to the present invention in the general case of a gas vein resulting from an upstream combustion. Dotted on this figure, there is shown the particular case where the hot vein is generated by a burner placed in situ, that is to say within the present device itself.
- Figures 2 and 3 show radial profiles of the temperature taken in the gas stream with the device (continuous lines) and without the device according to the invention (dashed lines).
- Figure 2 corresponds to a survey performed at the input of the device (convergent portion), and
- Figure 3 to a survey performed at the output of the device.
- Figures 4 and 5 show isotemperature maps made in a sectional plane perpendicular to the axis of the device.
- Figure 4 is obtained without the device, and Figure 5 with the device according to the invention.
- the device according to the invention can be defined as a device for cooling a hot gaseous vein by respecting a temperature constraint at the wall of said gaseous vein, throughout the crossing of said device, and a radial temperature profile. more homogeneous possible output of said device.
- the device according to the invention is an axisymmetrical device for controlling the temperature of a hot gas stream contained in an inner duct (4) of diameter Di and flowing substantially along the axis of symmetry of said device.
- the device which is the subject of the invention comprises:
- the supply line (5) is used to supply cooling fluid to the annular portion (6) between the outer cylindrical chamber (1) and the inner pipe (4).
- the supply line (5) of the coolant is located at a distance d from the input section of the device, d / Di being greater than 0.1.
- the inner duct (4) contains a burner extending approximately over a length equal to (L1) / 2.
- the cylindrical chamber (1) of diameter De is generally ordinary steel.
- the hot vein to be cooled can be generated by any combustion system producing flue gases up to a temperature of up to 2500 ° C.
- the hot gas stream is generated by a burner in situ, that is to say placed within the device inside the internal pipe of diameter Di.
- the length of the flame tube containing said burner is preferably between 0.5 L1 and 0.8 L1.
- the cooling fluid is introduced into the annular space through the pipe (5), preferably so as to produce a rotational movement of said cooling fluid in the same direction as the rotational movement of the combustion gases from the burner.
- the invention can also be defined as a method of cooling a hot gaseous stream by means of the device according to the present invention, in which the cooling fluid is injected via line (5) at an average speed generally of between 5 m / s and 80 m / s, and preferably between 10m / s and 30 m / s. Said speed is related to the section of the supply line (5) or to each of said supply lines when there are several.
- the method of cooling a hot gas stream by means of the device according to the invention makes it possible to produce a wall zone inside which the temperature is generally between 200 ° C. and 500 ° C.
- the method of cooling a hot gas stream by means of the device according to the invention simultaneously makes it possible to produce, at the outlet of said device, a uniform temperature radial profile throughout its section, ie with a difference in temperature. between the temperature at the center of the gas stream and the temperature at the periphery of the gas stream less than 35%.
- the present invention describes a device for lowering the temperature of a hot gas stream, contained in a conduit (4) of diameter Di, while ensuring its homogeneity in any section of said vein.
- the device consists of an axisymmetric assembly comprising: a cylindrical enclosure (1) of diameter De surrounding the duct (4) of diameter Di over a length L1,
- Lc / Di between 0.5 and 5 and preferably between 0.6 and 2
- X the main axis of symmetry of the device which corresponds to the coordinate according to which are counted the different lengths (L1, Lc, L2 ...), and also of the point process, at the coordinate according to which the gaseous vein flows.
- This supply line may be single or may be divided into a number of supply lines evenly distributed along the X axis.
- the choice of the number and the diameter of each of the ducts is made in such a way as to respect both the total flow rate of cooling fluid allowing to lower the temperature of the the gaseous vein at the desired temperature, and the cooling gas output speed criterion.
- the exit velocity of the cooling fluid at the level of the supply line or lines (5) is between 5 m / s and 80 m / s, and preferably between 10 m / s and 30 m / s.
- the direction of the velocity vector of the cooling fluid at the feed line (5) is perpendicular to the X axis, so as to induce a rotational movement of said cooling fluid inside the annular space ( 6).
- This rotational movement has the effect of homogenizing the flow of said cooling fluid all around the annular space (6), and thus homogenize the temperature field periphery of the device.
- the gaseous stream to be cooled may be generated upstream of the present device in any heat generating system, such as an oven, or may be generated by a burner placed within the same device.
- the present invention is compatible with any type of burner, whether the burner is premixed (or premix fuel and oxidant) or not.
- the burner will produce a non-pre-mixed flame, called diffusion flame.
- the present invention is also compatible with any type of gaseous or liquid fuel.
- the fuel consists of any hydrocarbon fraction, or light gases that may contain hydrogen.
- the oxidizer is usually air but can also be enriched air, or even in some cases pure oxygen.
- the burner generating the hot gas stream is a burner comprising a device for rotating the combustion gases generated (called "swirl" in the English terminology). In this case, the rotation of the cooling fluid inside the annular zone (6) is in the same direction as the rotation of the combustion gases generated by the burner.
- the burner is placed inside a tube, said flame tube, whose diameter di is approximately between 0.2 Di and 1 Di.
- the length of the flame tube containing the burner is approximately 0.5 L1 to 0.8 L1.
- the structure of the radial temperature profile of the hot gaseous vein after mixing with the cooling fluid, has a wall zone within which the temperature of the gaseous stream is less than 500 ° C. over the entire length of the device, and less than 700 ° C. at any point situated downstream of the device. It is in these conditions possible to use for the walls delimiting the device and the pipes located downstream of said device a type 309 steel according to the AISI standard (that is to say of typical composition 24% of Cr and 14% of Ni) , or any other equivalent steel.
- the cylindrical duct (3) inside which the exchange of heat between the gaseous gas to be cooled and the cooling fluid continues can be subjected to wall temperatures of up to 700 ° C.
- wall temperatures of up to 700 ° C.
- the purpose of this grid is to homogenize the flow of the cooling fluid all around the annular zone (6).
- the cooling fluid is generally air at room temperature. It may also be an inert gas such as nitrogen, argon or helium.
- the cooling fluid may also in some cases consist of a mixture containing CO2, such as fumes sufficiently cold and not containing water (so-called "dry" fumes).
- the cooling fluid may consist at least in part of a fraction cooled gaseous vein, after its use as heat transfer fluid in a downstream exchanger.
- a hot vein is produced by a burner placed inside the duct of diameter di.
- the burner has a length equal to 250mm.
- the geometric data of the device according to the invention are as follows:
- the oxidant consists of 10.8 g / s flow air and the fuel consists of liquid ethanol with a flow rate of 1.06 g / s.
- a flow of cooling air is injected perpendicularly to the section of the device, with a flow rate of 35 g / s, corresponding at a speed of 14.0 m / s.
- This cooling air flow ensures the rotation of said fluid over the entire annular space (6).
- the average temperature of the gas vein is then 1900 ° C.
- the case with device corresponds to the injection of cooling air into the annular space (6) between the duct of diameter Di and the outer envelope of diameter De.
- the average temperature of the gas stream after mixing with the fluid is then 700 ° C.
- the wall temperature is moreover always lower than 580 ° C.
- the radial temperature profile presents the walls with a cooled zone inside which the temperature is around 300 ° C., a zone that does not exist without the device where the temperature in the zone wall is about 1600 0 C.
- this level of homogeneity at the output of the device is difficult to achieve considering that one of the functions of the device is to permanently create a so-called "wall" temperature zone of less than 500 ° C., so as to protect the corresponding walls of said device.
- FIGS. 4 and 5 show isotemperature maps and make it possible to visualize the temperature field with and without the device.
- FIG. 4 shows a spread of the isotemperature curves especially around the conical zone (2), whereas in FIG. 5 (with the device) a very clear tightening of the isotemperature curves is observed. concentrated in a cylindrical brush approximately aligned with the flame tube.
- This tightening effect is particularly interesting since it allows to confine the hot vein while maintaining a cold wall zone.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gas Burners (AREA)
- Motor Or Generator Cooling System (AREA)
- Control Of Combustion (AREA)
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL09745913T PL2281149T3 (pl) | 2008-04-30 | 2009-04-29 | Nowe urządzenie do kontroli radialnego profilu temperatury strumienia gazu |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/112,140 US8096804B2 (en) | 2008-04-30 | 2008-04-30 | Device for controlling the radial profile of the temperature of a confined gas stream |
| PCT/FR2009/000509 WO2009138594A2 (fr) | 2008-04-30 | 2009-04-29 | Nouveau dispositif de controle du profil radial de la temperature d'une veine gazeuse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2281149A2 true EP2281149A2 (fr) | 2011-02-09 |
| EP2281149B1 EP2281149B1 (fr) | 2013-03-27 |
Family
ID=41256281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09745913A Not-in-force EP2281149B1 (fr) | 2008-04-30 | 2009-04-29 | Nouveau dispositif de controle du profil radial de la temperature d'une veine gazeuse |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US8096804B2 (fr) |
| EP (1) | EP2281149B1 (fr) |
| CN (1) | CN102016414B (fr) |
| AU (1) | AU2009247952B2 (fr) |
| BR (1) | BRPI0910542A2 (fr) |
| CA (1) | CA2721602C (fr) |
| MX (1) | MX2010011794A (fr) |
| MY (1) | MY151298A (fr) |
| PL (1) | PL2281149T3 (fr) |
| WO (1) | WO2009138594A2 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112018005896B1 (pt) * | 2015-10-01 | 2022-02-08 | Sgl Carbon Se | Dispositivo de combustão para a produção de halogenetos de hidrogênio |
| DE102016117252A1 (de) * | 2016-09-14 | 2018-03-15 | Horn Glass Industries Ag | Verfahren zum Betrieb eines Brenners und Brennvorrichtung |
| RS65455B1 (sr) * | 2021-12-10 | 2024-05-31 | Schwank Gmbh | Tamni radijator |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3930789A (en) * | 1973-03-06 | 1976-01-06 | J. Eberspacher | Device for preheating waste gases of an exhaust conduit |
| GB1540444A (en) * | 1976-05-06 | 1979-02-14 | Jetaire Co Ltd | Heaters |
| GB2062840A (en) * | 1979-10-22 | 1981-05-28 | Uniflux Inc | High intensity burner |
| DE3319214A1 (de) * | 1982-06-15 | 1983-12-15 | Veb Kombinat Fortschritt Landmaschinen Neustadt In Sachsen, Ddr 8355 Neustadt | Brennerkammer, vorzugsweise fuer backoefen |
| US5044932A (en) * | 1989-10-19 | 1991-09-03 | It-Mcgill Pollution Control Systems, Inc. | Nitrogen oxide control using internally recirculated flue gas |
| DE59706924D1 (de) * | 1996-02-07 | 2002-05-16 | Dvgw Deutscher Ver Des Gas Und | Verfahren und Vorrichtung zur Unterdrückung von Flammen-/Druckschwingungen bei einer Feuerung |
| AU7001400A (en) * | 1999-09-06 | 2001-04-10 | Shell Internationale Research Maatschappij B.V. | Mixing device |
| US6526746B1 (en) * | 2000-08-02 | 2003-03-04 | Ford Global Technologies, Inc. | On-board reductant delivery assembly |
-
2008
- 2008-04-30 US US12/112,140 patent/US8096804B2/en not_active Expired - Fee Related
-
2009
- 2009-04-29 AU AU2009247952A patent/AU2009247952B2/en not_active Ceased
- 2009-04-29 CA CA2721602A patent/CA2721602C/fr not_active Expired - Fee Related
- 2009-04-29 MX MX2010011794A patent/MX2010011794A/es active IP Right Grant
- 2009-04-29 PL PL09745913T patent/PL2281149T3/pl unknown
- 2009-04-29 EP EP09745913A patent/EP2281149B1/fr not_active Not-in-force
- 2009-04-29 WO PCT/FR2009/000509 patent/WO2009138594A2/fr not_active Ceased
- 2009-04-29 CN CN2009801154377A patent/CN102016414B/zh not_active Expired - Fee Related
- 2009-04-29 MY MYPI20105104 patent/MY151298A/en unknown
- 2009-04-29 BR BRPI0910542A patent/BRPI0910542A2/pt active Search and Examination
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009138594A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102016414A (zh) | 2011-04-13 |
| US8096804B2 (en) | 2012-01-17 |
| BRPI0910542A2 (pt) | 2017-11-14 |
| MY151298A (en) | 2014-04-30 |
| CN102016414B (zh) | 2013-07-24 |
| US20090272301A1 (en) | 2009-11-05 |
| CA2721602A1 (fr) | 2009-11-19 |
| PL2281149T3 (pl) | 2013-08-30 |
| AU2009247952A1 (en) | 2009-11-19 |
| CA2721602C (fr) | 2016-08-23 |
| MX2010011794A (es) | 2011-04-21 |
| WO2009138594A2 (fr) | 2009-11-19 |
| WO2009138594A3 (fr) | 2010-04-22 |
| AU2009247952B2 (en) | 2013-11-14 |
| EP2281149B1 (fr) | 2013-03-27 |
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