WO2004050225A1 - Dispositif de synthese de melanges de gaz et utilisation de ce dispositif pour tester des compositions catalytiques - Google Patents
Dispositif de synthese de melanges de gaz et utilisation de ce dispositif pour tester des compositions catalytiques Download PDFInfo
- Publication number
- WO2004050225A1 WO2004050225A1 PCT/FR2002/004113 FR0204113W WO2004050225A1 WO 2004050225 A1 WO2004050225 A1 WO 2004050225A1 FR 0204113 W FR0204113 W FR 0204113W WO 2004050225 A1 WO2004050225 A1 WO 2004050225A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- flow
- gas
- supply lines
- gas supply
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
- B01F25/4338—Mixers with a succession of converging-diverging cross-sections, i.e. undulating cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2211—Amount of delivered fluid during a period
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0418—Geometrical information
- B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
Definitions
- the invention relates to a device for synthesizing gas mixtures capable of automatically producing specific gas mixtures defined by the nature of the gases which compose them, their flow rate and the temperature.
- the mixing of gases carried out automatically and according to precise characteristics both in nature of the gases and in temperature or pressure of the mixture is a known procedure for testing apparatus or processes implementing these gas mixtures. This procedure is applied for example to test boilers or water heaters for which the gas mixtures used are particularly simple because they only contain a few components.
- the gas mixtures to be created in order to be able to test the catalytic compositions are particularly difficult to produce, on the one hand because they include many different gases in very different proportions, on the other hand because during the operation of an automobile engine, the composition of the exhaust gas varies significantly from one moment to the next (starting / deceleration or acceleration) as well as its temperature or flow.
- the gas mixing devices conventionally used to test boilers cannot be used to reproduce mixtures as complex as automobile exhaust gases.
- This homogeneity of the mixture is also important for checking whether the desired composition of the gas is well obtained: this check is carried out using an analyzer whose probe plunges into the gas mixture; poor mixing will lead to false control.
- An object of the present invention is therefore to propose a mixing device making it possible to synthesize a gaseous mixture comprising many different gases in very different proportions.
- Another object is to propose a device making it possible to synthesize a gaseous mixture having a composition which varies over time both in nature of the gases which compose it, in temperature or in total flow and specific to each gas.
- Another object is to propose a mixing device making it possible to synthesize a homogeneous gas mixture.
- the invention relates to a device for synthesizing gas mixtures comprising:
- mixing chamber into which the gas supply lines open, said mixing chamber comprising:
- a pipe > connected to the main flow gas supply line so that this gas forms a flow in the pipe,> connected to the secondary flow gas supply lines by at least one injector so that the secondary flow gases are introduced into the flow of the main flow gas • a static mixer placed in the extension of the pipe.
- the supply lines ensure the arrival of the gases to be mixed up to the mixing chamber. If certain fluids to be mixed are gaseous at room temperature, their supply lines are generally connected to the gas source by holders. On the other hand, if certain fluids are liquid at ambient temperature, their lines are connected to an evaporator making it possible to vaporize them and to transport them in gaseous form using a carrier gas such as nitrogen.
- the evaporator is equipped with a temperature regulator.
- Supply lines are generally equipped with pneumatic and manual shut-off valves, as well as non-return valves and filters.
- the supply lines are equipped with flow regulators so as to set the values of the flow rates of the gases to be mixed. These are generally mass flow regulators. If a fluid to be mixed is liquid at room temperature and needs to be vaporized, flow regulators are placed both on the evaporator liquid supply line and on the evaporator carrier gas supply line . For these lines, provision is generally made, after the evaporator, for the installation of a heating cord to avoid condensation of the vaporized liquid during its transport.
- the flow regulators are controlled by a PLC controlled by a computer. Thus, for each flow regulator, the computer calculates the flow setpoint, reads the actual value resulting from this setpoint, opens the valve of the associated regulator, checks that the measured value complies with the applied setpoint.
- the computer is connected to:
- phase diagram risk of flammability alone or as a mixture.
- the computer controls the automata which control the flow regulators.
- the supply lines can be equipped with a thermal oven, controlled by the computer, making it possible to fix the temperature of the gases to be mixed; the lines are then generally thermostatically controlled.
- the gas supply lines open into the mixing chamber, which includes a line and a static mixer.
- the supply lines are differently connected to the pipe depending on the nature of the gas flows conveyed there.
- the supply line which carries the main flow gas i.e. the largest flow gas
- flows into the pipe from the mixing chamber so that this main flow gas forms a flow in the pipe.
- This flow can advantageously be obtained by the introduction of the main gas tangentially into the pipe, for example by an injection pipe opening tangentially into the pipe.
- the secondary gas supply line (s) (that is to say the gases having a flow lower than the main flow) opens (s) into the pipe of the mixing chamber via 'at least one injector so that the gases of secondary flows are introduced into the flow of the main gas.
- injector is meant an orifice for accessing the pipe of the mixing chamber. This orifice can be located at the edge or in the middle of the pipe. It can be any type of injector. It preferably has a shape calculated for the injection of a gas of low flow rate.
- it may be an injector opening into the middle of the pipe and injecting at least one secondary flow gas axially into the pipe.
- It can also be a jet injector having an azimuthal flow effect (called "swirl" in English) at the periphery. This effect allows the creation of a turbulence promoting mixing by shearing.
- An injector whose injection axis has an angle of 90 ° with the axis of the pipe, an ejection end co-axial with the pipe and an azimuth component between 15 and 90 ° is particularly recommended.
- It can for example be the injector described in patent application EP-A-0 474 524.
- It can also be a plurality of jet injectors, for example arranged in the same cross section of driving in the form of a crown.
- injectors such as those mentioned above can be used simultaneously to introduce different secondary flow gases into the main flow gas flow.
- the main flow gas is introduced into the pipe by an injector opening tangentially into the pipe,
- the secondary gases preferably oxygenated gas, if an oxygenated gas is a secondary flow gas
- the secondary gases are injected axially into the center of the pipe, and
- the other part of the secondary gases are injected by a plurality of injectors all arranged in the same cross section of the pipe in the form of a ring.
- These secondary gases can be premixed, the premix obtained then being introduced into the injectors placed in the form of a crown; these gases can also be introduced separately into injectors other than the crown.
- the shape of the straight sections of the injectors is circular, but it has been observed that triangular or diamond shapes can allow better mixtures to be obtained.
- the mixing chamber also includes a static mixer placed in the extension of the pipe, that is to say after the injector connected to the gas supply lines of secondary flow in the direction of gas flow.
- a static mixer placed in the extension of the pipe, that is to say after the injector connected to the gas supply lines of secondary flow in the direction of gas flow.
- the static mixer present downstream of the injector is a pipe consisting successively:
- the term initial diameter means the diameter of the pipe at the start of the first section, if this pipe is round.
- the sequences of a converging part and a diverging part in the first section of the static mixer have a length of the order of an initial diameter, a length corresponding to the part of the pipeline between two points where it has a diameter equal to the initial diameter and between which it converges then diverges.
- the two converging and diverging parts generally have the same length.
- the minimum diameter of these sequences of converging and diverging parts at the most converging point of the pipeline is generally at least one third of the value of the initial diameter.
- the same rules are applied to the sequences of convergent part and divergent part as for the first section.
- the static mixer can comprise several successive sequences of a converging part and a diverging part. This is for example the case when it is desired to mix fluids having a low Reynolds number.
- each deformation leads to a pipe having in the straight section of the crushing a section of ellipsoidal shape (if the pipe at the start of the second section is round).
- Two successive deformations must be offset relative to each other by an angle between 10 and 45 °, preferably between 25 and 45 °, this angle corresponding to the angle formed between the directions of the lines of crushing of each deformation.
- the number of constrictions must be adapted to the nature of each mixture of fluids and to the subsequent use of the mixture, taking into account the fact that the greater the number of constrictions, the greater the pressure drop of the mixed fluids.
- a constriction is carried out so that the minimum diameter of the pipe at the level of the straight section of the crushing is at least one third of the value of the initial diameter.
- the length of a constriction may for example be of the order of the initial diameter.
- the static mixer does not include any element forming an intrusion in its wall and penetrating into its pipe (such as fins) to form an obstacle to the passage of fluids, in particular if the mixer makes it possible to treat fluids containing dust. which could settle on these intrusive elements, or if the mixer makes it possible to treat fluids whose temperature one wishes to control, or even if the mixer must treat corrosive gases.
- the device according to the invention makes it possible to mix gases having flow rates between 10 l / min and 800 l / min and ratios of main / secondary flow rates between 1 and 50. These flow rates can change over time up to values such that the value of the total flow decreases or increases by 30%. It has been found that a perfectly homogeneous mixture of the different fluids has been obtained regardless of the value of these flow rates.
- the quality control of the mixture is carried out using a probe analyzing, at the end of the pipeline, the composition of the gas mixture over the entire length of a diameter of the pipe.
- perfectly homogeneous mixture is therefore meant a mixture for which the composition is identical over the entire length of this diameter.
- the assembly of the pipe and of the static mixer can be surrounded by an external pipe having means for injecting a fluid into the gap delimited by this external pipe and the external wall of the mixed.
- the fluid is injected into this gap against the flow of the fluids to be mixed.
- the countercurrent fluid is generally an inert gas, preferably nitrogen.
- the temperature of this fluid corresponds to that at which it is desired to maintain the gas mixture.
- This variant using an inert gas against the current of the fluids to be treated makes it possible to effectively regulate the temperature of the gases being mixed.
- the temperature can be maintained or changed very quickly; thus, this implementation makes it possible to vary the temperature by +/- 5 ° C per second for a temperature range between 60 and 600 ° C.
- the present invention also relates to the use of the above device for testing catalytic compositions.
- This device makes it possible to produce gas mixtures representative of industrial applications and which are subjected to catalytic treatments. Mixing these gases as desired makes it possible to test catalytic compositions.
- the invention relates more particularly to a device for testing catalytic compositions implementing reactions with gas mixtures comprising:
- mixing chamber into which the gas supply lines open, said mixing chamber comprising:
- reaction chamber comprising means for bringing the gas mixture and the catalyst to be tested into contact, - an analyzer of the gas mixture leaving the reaction chamber.
- test device corresponds to the previously described mixing device to which is added:
- a first gas analyzer making it possible to control the nature of the gas mixture at the outlet of the mixing chamber, a reaction chamber in which the catalyst to be tested is brought into contact with the gas mixture produced in the mixing chamber,
- a second gas analyzer making it possible to control the nature of the gas mixture at the outlet of the reaction chamber with a view to analyzing the efficiency of the catalyst tested by comparison with the nature of the gas mixture at the outlet of the chamber mixture.
- the analyzer of the gas mixture leaving the mixing chamber and the computer controlling the automatic device which controls the flow regulators are coupled so as to adjust the composition of the gas mixture.
- This coupling makes it possible to avoid the drifts due for example to the clogging of the device.
- the catalytic composition test device can in particular be used to simulate a composition of automobile engine exhaust gases and to test different depolluting catalysts.
- the present invention finally relates to the use of the previous device for calibrating analyzers.
- This device makes it possible in fact to produce gas mixtures, to subject these gas mixtures to precise catalytic treatments, the result of which is known exactly on the gas mixtures. By checking the compositions of the gas mixture with analyzers before and after catalytic treatment, it is therefore possible to calibrate the analyzers.
- FIGS 1 and 2 illustrate the mixing chamber of the device according to the invention.
- a linear pipe (1) with a diameter of 60 mm, one end of which is closed.
- a conduit (2) with a diameter of 10 mm and tangent to the pipe (1) penetrates tangentially into the pipe (1).
- the main flow fluid is injected through this conduit (2).
- a conduit (3) enters axially in the pipe (1).
- the end of this conduit (3), which enters the pipe (1) is pierced with a hole (4) for the injection of a secondary fluid axially to the pipe (1) via a pipe (41) .
- the pipe (3) is also radially drilled with 8 holes (5) with a diameter of 4 mm for the injection of secondary fluids, mixed or separately, radially in the pipe (1).
- the pipeline (1) continues with a static mixer composed of:
- a first section, 60 mm long consisting of a converging section (6) passing from an initial diameter of 60 mm to a minimum diameter of 20 mm and a diverging section (7) passing from the minimum diameter from 20 mm to a maximum diameter of 60 mm,
- a first part of length 60 mm comprising a radial deformation (8) of minimum section 20 mm
- a second portion of length 60 mm comprising a radial deformation (9) of minimum diameter 20 mm, this second deformation being obtained by crushing the cross section of the pipe between two parallel straight lines whose direction makes an angle of 45 ° with the direction of the two parallel straight lines leading to the first deformation
- ' - a third section consisting of a converging section (10) passing from an initial diameter of 60 mm to a minimum diameter of 20 mm and of a diverging section (1 1) passing from the minimum diameter of 20 mm to a maximum diameter of 60 mm.
- the device of the invention is used to reproduce a mixture of automobile combustion exhaust gases varying over time.
- the desired mixture must have the following characteristics of compositions and variations in flow rates:
- the liquid hydrocarbons and H 2 O are each vaporized at a temperature of 300 ° C. in a stream of nitrogen.
- the flow rate of each of the currents obtained is controlled by a flow regulator, then these currents are mixed in an isolated common supply line so as to avoid condensation of the vaporized products.
- This line joins two other supply lines: that of the main flow nitrogen and that of SO 2 and CO 2 , which forms the main supply line, which enters the mixing chamber of FIG. 1 through the conduit (2). This is the main flow gas.
- the gaseous products CO, H 2 , NH 3 , the gaseous hydrocarbons, the nitrogen of secondary flow are introduced by the same supply line into the conduit (3) through four of the holes (5) of the conduit (3) ( secondary flow) NO is introduced through the other four holes (5) of the conduit (3) (secondary flow).
- the various supply lines for products to be mixed are all equipped with flow regulators controlled by automatic machines.
- the automata are controlled by a computer programmed to implement the composition and the flow rates in the table above to reproduce the engine cycle.
- the homogeneity of the mixture is checked using an analysis sampling probe placed at the outlet of the dynamic mixer and at this location analyzing the composition of the fluid over the entire length of the diameter of the dynamic mixer.
- an analysis sampling probe placed at the outlet of the dynamic mixer and at this location analyzing the composition of the fluid over the entire length of the diameter of the dynamic mixer.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002364410A AU2002364410A1 (en) | 2002-11-29 | 2002-11-29 | Device for synthesis of gas mixtures and use thereof for testing catalytic compositions |
EP02799763A EP1581331B1 (fr) | 2002-11-29 | 2002-11-29 | Dispositif de synthese de melanges de gaz et utilisation de ce dispositif pour tester des compositions catalytiques |
PCT/FR2002/004113 WO2004050225A1 (fr) | 2002-11-29 | 2002-11-29 | Dispositif de synthese de melanges de gaz et utilisation de ce dispositif pour tester des compositions catalytiques |
DE60218548T DE60218548T2 (de) | 2002-11-29 | 2002-11-29 | Vorrichtung zur synthese von gasmischungen und verwendung dieser vorrichtung zum testen katalytischer zusammensetzungen |
AT02799763T ATE355121T1 (de) | 2002-11-29 | 2002-11-29 | Vorrichtung zur synthese von gasmischungen und verwendung dieser vorrichtung zum testen katalytischer zusammensetzungen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR2002/004113 WO2004050225A1 (fr) | 2002-11-29 | 2002-11-29 | Dispositif de synthese de melanges de gaz et utilisation de ce dispositif pour tester des compositions catalytiques |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004050225A1 true WO2004050225A1 (fr) | 2004-06-17 |
Family
ID=32406122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/004113 WO2004050225A1 (fr) | 2002-11-29 | 2002-11-29 | Dispositif de synthese de melanges de gaz et utilisation de ce dispositif pour tester des compositions catalytiques |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1581331B1 (fr) |
AT (1) | ATE355121T1 (fr) |
AU (1) | AU2002364410A1 (fr) |
DE (1) | DE60218548T2 (fr) |
WO (1) | WO2004050225A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT521176B1 (de) * | 2018-08-28 | 2019-11-15 | Avl List Gmbh | Gasmischvorrichtung zur Linearisierung oder Kalibrierung von Gasanalysatoren |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3026039A1 (de) * | 1980-07-09 | 1982-01-21 | Boris Eskilstuna Lindgren | Verfahren und vorrichtung zur innigen vermischung von medien gleichen oder verschiedenen aggregatzustandes |
US4861165A (en) * | 1986-08-20 | 1989-08-29 | Beloit Corporation | Method of and means for hydrodynamic mixing |
US4910008A (en) * | 1984-07-11 | 1990-03-20 | Rhone-Poulenc Chimie De Base | Gas-gas phase contactor |
US5129412A (en) * | 1991-05-08 | 1992-07-14 | Saes Pure Gas, Inc. | Aerodynamic blender |
-
2002
- 2002-11-29 WO PCT/FR2002/004113 patent/WO2004050225A1/fr active IP Right Grant
- 2002-11-29 AU AU2002364410A patent/AU2002364410A1/en not_active Abandoned
- 2002-11-29 AT AT02799763T patent/ATE355121T1/de not_active IP Right Cessation
- 2002-11-29 DE DE60218548T patent/DE60218548T2/de not_active Expired - Lifetime
- 2002-11-29 EP EP02799763A patent/EP1581331B1/fr not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3026039A1 (de) * | 1980-07-09 | 1982-01-21 | Boris Eskilstuna Lindgren | Verfahren und vorrichtung zur innigen vermischung von medien gleichen oder verschiedenen aggregatzustandes |
US4910008A (en) * | 1984-07-11 | 1990-03-20 | Rhone-Poulenc Chimie De Base | Gas-gas phase contactor |
US4861165A (en) * | 1986-08-20 | 1989-08-29 | Beloit Corporation | Method of and means for hydrodynamic mixing |
US5129412A (en) * | 1991-05-08 | 1992-07-14 | Saes Pure Gas, Inc. | Aerodynamic blender |
Also Published As
Publication number | Publication date |
---|---|
AU2002364410A1 (en) | 2004-06-23 |
EP1581331B1 (fr) | 2007-02-28 |
DE60218548T2 (de) | 2007-11-08 |
EP1581331A1 (fr) | 2005-10-05 |
ATE355121T1 (de) | 2006-03-15 |
DE60218548D1 (de) | 2007-04-12 |
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