WO2004005187A1 - Method and device for supporting catalyst gauzes in an ammonia oxidation burner - Google Patents
Method and device for supporting catalyst gauzes in an ammonia oxidation burner Download PDFInfo
- Publication number
- WO2004005187A1 WO2004005187A1 PCT/NO2002/000332 NO0200332W WO2004005187A1 WO 2004005187 A1 WO2004005187 A1 WO 2004005187A1 NO 0200332 W NO0200332 W NO 0200332W WO 2004005187 A1 WO2004005187 A1 WO 2004005187A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- support system
- catalyst
- burner
- wave breaker
- support
- Prior art date
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 27
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 9
- 230000003647 oxidation Effects 0.000 title claims abstract description 8
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000000919 ceramic Substances 0.000 claims abstract description 13
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 238000006887 Ullmann reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- CAMXVZOXBADHNJ-UHFFFAOYSA-N ammonium nitrite Chemical compound [NH4+].[O-]N=O CAMXVZOXBADHNJ-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000013383 initial experiment Methods 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
- B01J8/0292—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds with stationary packing material in the bed, e.g. bricks, wire rings, baffles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/008—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
- C01B21/265—Preparation by catalytic or non-catalytic oxidation of ammonia characterised by the catalyst
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
- C01B21/28—Apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00796—Details of the reactor or of the particulate material
- B01J2208/00884—Means for supporting the bed of particles, e.g. grids, bars, perforated plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/02—Apparatus characterised by their chemically-resistant properties
- B01J2219/025—Apparatus characterised by their chemically-resistant properties characterised by the construction materials of the reactor vessel proper
- B01J2219/0277—Metal based
Definitions
- the "wave breaker” could also be a smooth or perforated sheet arranged at an angle of 10-60° to the wall. A preferred angle is 25-35°.
- the ridge or sheet could be made of segments and the segments could have an end wall. It is also possible to use a "wave breaker" in the form of a honeycomb structure, preferably with a sloping top. Initial tests in small scale indicated that an important factor for the formation of the trough is the difference in expansion of the Raschig rings and metal support due to temperature variation.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Catalysts (AREA)
- Gas Burners (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Vehicle Body Suspensions (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention comprise a support system for catalyst gauzes in an ammonia oxidation burner and a method of reducing movement of particulate ceramic material due to thermal dilatation. The catalyst gauzes (1) and possibly support screens (2) are being supported by ceramic fillings contained in a burner basket with metal walls and a perforated bottom plate. A 'wave breaker' (9, 11) is fixed to the metal wall (4) and/or the outer part/periphery of the bottom plate (5).
Description
Method and device for supporting catalyst gauzes in an ammonia oxidation burner.
h a conventional ammonia oxidation burner a mixture of NH3, O2 and N2 react at elevated temperature and pressure over a platinum metal catalyst to nitrogen oxides. Volatilised platinum is collected by a catchment material. Typically, both the catalyst and catchment material comprise a woven or knitted gauze and accordingly several such gauzes made into a pack secured to the burner structure by clamping means. The catalyst/catchment pack is placed on a support in the burner. The most commonly used type of support is ceramic rings, Raschig rings, placed in a basket secured to the burner structure. Usually a support gauze of woven or lαiitted non precious metal, for instance "Megapyr", is placed between the main support and the catalyst/catchment pack. Such conventional burners are further described in Ullmanns Encyclopaedia, Vol. 20, pages 314-317, 4th Ed. If a N2O decomposition catalyst is used in the burner, this will replace all or a part of the support material.
The ceramic rings and possible ceramic catalyst material often move away from the periphery during operation due to thermal dilatation. This movement creates a trough which often causes the gauze pack to tear. Especially around the outer edge of the gauzes the damage might be severe due to the lowered level of the Raschig rings there. It is a common observation that the trough deepens with the number of starts and stops in the plant. This tearing represents a problem both due to loss of combustion efficiency, reduced cycle time and also a hazard problem. The ammonia slipping may form ammonium nitrate and ammonium nitrite in the downstream equipment, especially in the acid condenser. Ammonium nitrate and nitrite may decompose violently.
The object of the invention is to arrive at a support structure that would not cause damage to the catalyst pack during operation of the burner. Another object is to arrive at a system that prevents or reduces movement of particulate ceramic material during operation.
These and other objects of the invention are obtained with the method and support system as described below. The invention is further characterised by the patent claims. The invention will be described with reference to the drawings, Figure 1- 2 where
Figure 1 shows the formation of a trough in the ceramic fillings contained in a burner basket.
Figure 2 shows different configurations of the "wave breaker".
The invention thus concerns a method and a support system for reducing movement of particulate ceramic material and avoiding tearing of catalyst gauzes in an ammonia oxidation burner. The catalyst gauzes and possibly support screens are being supported by ceramic fillings and possible catalyst material contained in a burner basket with metal walls and perforated bottom plate. A "wave breaker" is preferably fixed to the metal wall of the burner basket or alternatively to the periphery of the bottom plate of the burner basket. The ceramic fillings will then move along with the metal wall during expansion. It is preferred that the "wave breaker" is perforated and filled with ceramic fillings or similar material to obtain the same flow resistance as the filling material of the bed. The "wave breaker" could be in the form of a triangular shaped ridge. It could be a right-angled triangle with the right angled wall fixed to the metal wall, or an equilateral triangle fixed to the periphery of the bottom plate. The "wave breaker" could also be a smooth or perforated sheet arranged at an angle of 10-60° to the wall. A preferred angle is 25-35°. The ridge or sheet could be made of segments and the segments could have an end wall. It is also possible to use a "wave breaker" in the form of a honeycomb structure, preferably with a sloping top.
Initial tests in small scale indicated that an important factor for the formation of the trough is the difference in expansion of the Raschig rings and metal support due to temperature variation. After only a few cycles of expansion without any support systems in the bed a trough was created, and part of the outer edge became empty of rings. This is similar to observations from burners which have been in operation. The cause of the trough formation is believed to be the difference in thermal expansion in the metal of the burner basket and the ceramic Raschig rings. In the larger plants with up to 5 m in burner diameter, the thermal expansion of the metal basket are up to 30 mm on the radius, caused by heating from ambient to operation temperature.
In figure 1 the effect of the heat variations is illustrated. Figure 1A shows schematically the equipment before start. The ammonia oxidation burner comprises a catalyst layer, usually in the form of a plurality of woven or knitted gauzes of Pt/Rh wire and normally a catchment layer of getter material, for instance a palladium alloy in the form of woven or lαiitted gauzes. All these gauzes form a pack 1 resting on a steel screen 2 supported by a layer of Raschig rings 3 placed in a basket with metal wall 4 and perforated bottom plate 5. Some or all of the Raschig rings may be replaced by a ceramic catalyst. The catalyst pack, the catchment pack and the support gauze are secured to the circumference of the burner on a ledge by fixing weights 6 or similar arrangement. The basket is also secured to the burner wall at about the same place. Before start the Raschig rings bed is levelled, and the steel screen and the catalyst gauze pack are installed and fixed around the periphery.
After the first start, the metal wall and perforated bottom plate expands more than the Raschig rings. This means that the Raschig rings will not expand and fill the gap after the metal wall has moved outwards. This situation is illustrated in Figure IB.
When the plant shuts down the metal wall cools and contracts, and the Raschig rings at the periphery are pushed inwards with respect to their original position. Figure 1C shows a vertical section view of a conventional catalyst and catchment gauze pack and its support at the end of a campaign. Here a trough 7 is formed which often causes the gauzes to tear. This tearing represents a problem both due to loss of combustion efficiency, reduced campaign length and also a hazard problem.
It is the rings close to the periphery that moves. To overcome this problem it was suggested to install a support structure, also called "wave breaker", in the bed to prevent the creation of a trough. Based on the initial experiments a test unit was constructed with dimensions as one part from centre to periphery of an average burner. To simulate temperature expansion, hydraulic force was installed to be able to move one of the short walls. The pilot test will not be able to reproduce the expansion over the whole radius of the burner, but can reproduce the net effect at one end of the compartment. The number of expansions of a burner in operation are dependent on the number of shut downs during one campaign, this number varies between 1 and 10.
The first step was to recreate the phenomenon with the trough which is formed at the periphery of the Raschig ring bed during operation. This point was of importance to see whether the temperature expansion could be regarded as one of the main reasons. This was done to simulate the temperature expansion by only moving the movable wall with different expansion lengths. The different expansion lengths used were 70, 50 and 30 mm. To simulate the variation in temperature during normal operation expansion, first an outward stroke with 30 mm (start-up) and then consecutive inward and outward strokes of 10 mm were used. After only a few cycles of movement the trough was created, and part of the outer edge was empty of rings. This is similar to observations done in burners which have been in operation. Even with only 10 mm repetitive expansion/ contractions the pilot test unit was able to recreate the formation of the trough.
Different "wave breakers" were tried out in the pilot plant and these are illustrated in figure 2 . The tested shapes were a short and long honeycomb structure, a smooth or perforated sheet at different angles and a triangular shaped ridge.
First the short "honeycomb" as shown in Figure 2D was placed in the bed next to the movable wall without being fastened, and the rings were filled in. The result of an expansion of 30 mm was that the support system started to move inwards and upwards in the bed, at the same time as the trough was created. After 8 cycles the entire support system had risen above the Raschig ring bed, and part of the outer edge was empty of rings. A perforated bottom was welded on to the "honeycomb" support system, and placed in the bed as in the previous experiment. The support system moved somewhat up in the bed, but was stabilised and did not move to the top of the bed. There was however no improvement of the formation of the trough.
A "honeycomb" support system with bottom was then welded to the movable wall. The results of the expansion then was that the trough was created outside of the "honeycomb", but the rings in the chambers did not move at all. The trough was smaller than in the previous experiments, but after 6 cycles the outer edge of the support system became visible in the bed.
Experiments with the long honeycomb structure (Fig. 2C) were also carried out. It was found that the best results were obtained when the support structure was welded to the movable wall and part of the support structure was cut off as shown in Figure 2E.
The short and long honeycomb support system penetrated the top of the Raschig ring layer in most cases. This can result in sharp edges cutting the gauze, even without the trough formation. When the top of the honeycomb support was cut with a sloping top 8, the performance improved and the support did not penetrate the top of the Raschig rings bed. This system with many small compartments will probably be somewhat more
complicated to handle, since all compartments must be filled with rings. If there is mounted a perforated bottom in the compartments, they can however be lifted out as complete sections.
Experiments were also carried out with a smooth sheet 9 placed in the bed at two differ- ent angels oc 60 and 75 ° as illustrated in Figure 2A. The sheet was welded to the movable wall and three support wedges 10 were welded to the sheet. The smooth sheet installed with an angle of 60° gave the best results with no permanent trough formation. Alternatively it could be a right-angled triangle with the right angled wall fixed to the metal wall. The solution with a sloping sheet is dependent on the roughness of the sheet and the sloping angle. If the angle is reduced, more of the area in the burner is covered. When the sheet is not perforated, the flow area in the burner will be reduced and creating higher pressure drop and uneven flow over the catalyst gauze.
A perforated sheet (5mm holes) was placed in the bed with different angels, 60°, 45° and 30°. The sheet was welded to the movable wall and three support wedges were welded to the sheet. The results are given in Table 1:
Table 1.
* length from the movable wall to the trough (if the trough is created away from the movable wall).
1. h=250 2. h= 300
3. The trough is created next to the movable wall
4. The trough has moved into the bed, about 300 mm.
5. The trough is permanent
With an angle of 60° a trough was created next to the movable wall (50 mm at 5 cycles). Also with 45° a trough was created at the wall, but the size was reduced compared to 60° (35 mm at 35 cycles). By using a sheet with 30° slope the trough moved about 300 mm into the bed and the depth was also reduced (20 mm at 20 cycles).
Experiments were also carried out with a triangular shaped ridge 11 (pyramid shaped support) of perforated sheets (5 mm). It was first placed in the bed without being welded to the movable wall. With this arrangement hardly any improvement in the through formation was observed. If this support is not fastened there is a possibility that the top of the pyramid will penetrate the bed and result in sharp edges that can tear the
gauze. When the support was welded to the wall, the support followed the movements and a trough was formed outside the top of the support. This through was significantly shallower than what was observed without the wave breaker installed. The installation of the triangular shaped ridge that moves with the outer wall or the outer part of the perforated bottom, will move the Raschig rings together with the metal. When the trough is created closer to the centre of the burner basket, the height difference will be smaller.
In the following the results are given for the experiments with a pyramid shaped "wave breaker". A triangular ridge (pyramid shaped) was arranged along the outer wall. The height of the ridge was 100 mm and the angle between the floor and the side was 45°. The edge of the ridge was at the closest approximately 50 mm from the outer wall. The ridge was fixed to the outer wall. The height of Raschig rings was 130 mm -300 mm.
Table 2. Results of wall movements with pyramid shaped "wave breaker".
The trough that is formed is a rather flat depression with no sharp edges or steep falls.
With regard to the trough formation and operation of the burners the solution with the perforated sloping sheets seems to be the best. With an angle of 30° to the horizontal plane the trough was formed away from the wall and the depth was significantly reduced compared to the original. When the trough is formed somewhat away from the wall the
tearing forces on the gauze will be reduced. We avoid the concentration of forces due to the gauze weight and the trough formation too close together.
Almost all the wave breakers that were tried gave better results than the use of no support at all. It would also be possible to use for example a sinuosidally shaped metal band fixed to the metal wall. This could be placed just below the steel screen.
In burners which are in operation, expansion occurs over the whole radius. In pilot test unit the expansion is concentrated at a relatively short distance close to the movable wall, but the test unit recreate the trough as it is seen in operation. Both "wave breakers" in the form of a triangular shaped ridge and a sloping sheet have been tested out in full scale in the factory and the results from the pilot test is confirmed. When a smooth sheet is used, the angle is not of importance as the Rashig rings slide easily on this material. However, when perforated sheets are used the correct angle is important.
Claims
1. A support system for catalyst gauzes in an ammonia oxidation burner, where the catalyst gauzes (1) and possibly support screens are being supported by ceramic fillings (3) and/ or catalyst contained in a burner basket with metal walls (4) and a perforated bottom plate (5), characterized in that a "wave breaker" (9,11) is fixed to the metal wall and/or the outer part /periphery of the bottom plate.
2. A support system according to claim 1, characterized in that the "wave breaker" is filled with ceramic fillings/ catalyst or similar material to obtain the same flow resistance as the filling material of the bed.
3. A support system according to claim 1, characterized in that the "wave breaker" is a triangular shaped ridge
(11).
4. A support system according to claim 1, characterized in that the "wave breaker" is a smooth or perforated sheet (9) arranged at an angle of 10-60 ° to the wall.
5. A support system according to claim 4, characterized in that the angle is 25-35°.
6. A support system according to claim 3, 4 or 5, characterized in that wave breaker is made of segments.
7. A support system according to claim 6, characterized in that the segments have end walls.
8. A support system according to claim 1, characterized in that the "wave breaker" is a honeycomb structure.
5 9. A support system according to claim 8, characterized in that the honeycomb structure has a sloping top (8).
10. A method of reducing movement of ceramic material and avoiding tearing of catalyst gauzes in an ammonia oxidation burner where the catalyst gauzes and possibly support screens are being supported by ceramic fillings and possibly a 10 catalyst on a perforated plate or contained in a burner basket with metal walls and perforated bottom plate, characterized in that a "wave brealcer" is fixed to the metal wall and/or the outer part/periphery of the bottom plate of the burner basket and moves the ceramic material together with the metal wall during expansion.
15 11. Method according to claim 9, characterized in that it is used a "wave breaker" formed like a triangular shaped ridge, a smooth or perforated sheet or a honeycomb structure.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT02768177T ATE481355T1 (en) | 2002-07-03 | 2002-09-20 | METHOD AND DEVICE FOR SUPPORTING CATALYST NETWORK IN AN AMMONIA ACOXIDATION BURNER |
| US10/519,072 US7563419B2 (en) | 2002-07-03 | 2002-09-20 | Method and device for supporting catalyst gauzes in an ammonia oxidation burner |
| EP02768177A EP1558523B1 (en) | 2002-07-03 | 2002-09-20 | Method and device for supporting catalyst gauzes in an ammonia oxidation burner |
| DE60237723T DE60237723D1 (en) | 2002-07-03 | 2002-09-20 | METHOD AND DEVICE FOR TRANSFERRING CATALYST NETS IN AN AMMONIA CYCIDATION BURNER |
| AU2002330778A AU2002330778A1 (en) | 2002-07-03 | 2002-09-20 | Method and device for supporting catalyst gauzes in an ammonia oxidation burner |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20023235A NO318861B1 (en) | 2002-07-03 | 2002-07-03 | Catalyst Grid Support Device and Method for Reducing Movement of Particular Ceramic Material Due to Thermal Expansion |
| NO20023235 | 2002-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004005187A1 true WO2004005187A1 (en) | 2004-01-15 |
Family
ID=19913794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/NO2002/000332 WO2004005187A1 (en) | 2002-07-03 | 2002-09-20 | Method and device for supporting catalyst gauzes in an ammonia oxidation burner |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US7563419B2 (en) |
| EP (1) | EP1558523B1 (en) |
| AT (1) | ATE481355T1 (en) |
| AU (1) | AU2002330778A1 (en) |
| DE (1) | DE60237723D1 (en) |
| ES (1) | ES2352374T3 (en) |
| NO (1) | NO318861B1 (en) |
| PT (1) | PT1558523E (en) |
| RU (1) | RU2284291C2 (en) |
| WO (1) | WO2004005187A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9725320B2 (en) | 2013-08-16 | 2017-08-08 | Basf Se | Basket-like device having wall insulation |
| EP3501633A1 (en) | 2017-12-19 | 2019-06-26 | Yara International ASA | Catalyst support systems for ammonia oxidation burners |
| EP3221261B1 (en) | 2014-11-21 | 2019-10-09 | thyssenkrupp Industrial Solutions AG | Burner basket for an ammonia oxidation burner |
| WO2020012088A1 (en) * | 2018-07-11 | 2020-01-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Device made of fabric for limiting or preventing the migration of particules between two layers |
| RU2778061C2 (en) * | 2018-07-11 | 2022-08-15 | Л'Эр Ликид, Сосьете Аноним Пур Л'Этюд Э Л'Эксплуатасьон Де Проседе Жорж Клод | Device made of fabric for limitation or prevention of particle movement between two layers |
| US11413593B2 (en) | 2018-07-11 | 2022-08-16 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Device for limiting or eliminating the migration of particles between two layers |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7601493B2 (en) * | 2002-07-26 | 2009-10-13 | Nanogen, Inc. | Methods and apparatus for screening and detecting multiple genetic mutations |
| DE102011112782A1 (en) * | 2011-09-09 | 2013-03-14 | Thyssenkrupp Uhde Gmbh | Device for bypass reduction in ammonia oxidation burners |
| DE102011112781A1 (en) * | 2011-09-09 | 2013-03-14 | Thyssenkrupp Uhde Gmbh | Device for bypass reduction in ammonia oxidation burners |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2754643A1 (en) * | 1977-12-08 | 1979-06-13 | Davy Powergas Gmbh | Furnace for oxidising ammonia - for the prodn. of nitric acid |
| WO1986003479A1 (en) * | 1983-03-15 | 1986-06-19 | Johnson Matthey Public Limited Company | Catchment packs |
| WO1991008982A1 (en) * | 1989-12-13 | 1991-06-27 | Norsk Hydro A.S | Catalyst pack support in ammonia oxidation burner |
| GB2274071A (en) * | 1993-01-06 | 1994-07-13 | Pgp Ind Inc | Catalyst pack |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2745722A (en) * | 1953-06-17 | 1956-05-15 | Monsanto Chemicals | Apparatus for calking catalyst bed |
| SU1678425A1 (en) | 1989-11-01 | 1991-09-23 | Рижский политехнический институт им.А.Я.Пельше | Gravitational mixer |
| FR2741823B1 (en) * | 1995-12-05 | 1998-01-23 | Air Liquide | INSTALLATION FOR TREATING AT LEAST ONE FLUID AND USE FOR SEPARATING AT LEAST ONE CONSTITUENT OF A GASEOUS MIXTURE |
| GB9626516D0 (en) * | 1996-12-20 | 1997-02-05 | Ici Plc | Ammonia oxidation |
| GB9712444D0 (en) | 1997-06-17 | 1997-08-13 | Ici Plc | Ammonia oxidation |
| GB9900314D0 (en) | 1999-01-08 | 1999-02-24 | Ici Plc | Catalyst support |
| GB0115296D0 (en) * | 2001-06-22 | 2001-08-15 | Ici Plc | Catalyst or sorbent beds |
-
2002
- 2002-07-03 NO NO20023235A patent/NO318861B1/en not_active IP Right Cessation
- 2002-09-20 AU AU2002330778A patent/AU2002330778A1/en not_active Abandoned
- 2002-09-20 ES ES02768177T patent/ES2352374T3/en not_active Expired - Lifetime
- 2002-09-20 AT AT02768177T patent/ATE481355T1/en not_active IP Right Cessation
- 2002-09-20 US US10/519,072 patent/US7563419B2/en not_active Expired - Lifetime
- 2002-09-20 EP EP02768177A patent/EP1558523B1/en not_active Expired - Lifetime
- 2002-09-20 WO PCT/NO2002/000332 patent/WO2004005187A1/en not_active Application Discontinuation
- 2002-09-20 PT PT02768177T patent/PT1558523E/en unknown
- 2002-09-20 DE DE60237723T patent/DE60237723D1/en not_active Expired - Lifetime
- 2002-09-20 RU RU2005102602/15A patent/RU2284291C2/en active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2754643A1 (en) * | 1977-12-08 | 1979-06-13 | Davy Powergas Gmbh | Furnace for oxidising ammonia - for the prodn. of nitric acid |
| WO1986003479A1 (en) * | 1983-03-15 | 1986-06-19 | Johnson Matthey Public Limited Company | Catchment packs |
| WO1991008982A1 (en) * | 1989-12-13 | 1991-06-27 | Norsk Hydro A.S | Catalyst pack support in ammonia oxidation burner |
| GB2274071A (en) * | 1993-01-06 | 1994-07-13 | Pgp Ind Inc | Catalyst pack |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9725320B2 (en) | 2013-08-16 | 2017-08-08 | Basf Se | Basket-like device having wall insulation |
| EP3221261B1 (en) | 2014-11-21 | 2019-10-09 | thyssenkrupp Industrial Solutions AG | Burner basket for an ammonia oxidation burner |
| CN111491722A (en) * | 2017-12-19 | 2020-08-04 | 雅苒国际集团 | Catalyst support system for ammonia oxidation combustor |
| WO2019121862A1 (en) | 2017-12-19 | 2019-06-27 | Yara International Asa | Catalyst support systems for ammonia oxidation burners |
| EP3501633A1 (en) | 2017-12-19 | 2019-06-26 | Yara International ASA | Catalyst support systems for ammonia oxidation burners |
| CN111491722B (en) * | 2017-12-19 | 2022-06-24 | 雅苒国际集团 | Catalyst support system for ammonia oxidation combustor |
| US11485639B2 (en) | 2017-12-19 | 2022-11-01 | Yara International Asa | Catalyst support systems for ammonia oxidation burners |
| AU2018390831B2 (en) * | 2017-12-19 | 2024-01-04 | Yara International Asa | Catalyst support systems for ammonia oxidation burners |
| WO2020012088A1 (en) * | 2018-07-11 | 2020-01-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Device made of fabric for limiting or preventing the migration of particules between two layers |
| FR3083718A1 (en) * | 2018-07-11 | 2020-01-17 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | CANVAS DEVICE FOR LIMITING OR ELIMINATING PARTICLE MIGRATION BETWEEN TWO LAYERS |
| US11383219B2 (en) | 2018-07-11 | 2022-07-12 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Device made of fabric for limiting or preventing the migration of particles between two layers |
| RU2778061C2 (en) * | 2018-07-11 | 2022-08-15 | Л'Эр Ликид, Сосьете Аноним Пур Л'Этюд Э Л'Эксплуатасьон Де Проседе Жорж Клод | Device made of fabric for limitation or prevention of particle movement between two layers |
| US11413593B2 (en) | 2018-07-11 | 2022-08-16 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Device for limiting or eliminating the migration of particles between two layers |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20023235L (en) | 2004-01-05 |
| ATE481355T1 (en) | 2010-10-15 |
| RU2284291C2 (en) | 2006-09-27 |
| US20060110302A1 (en) | 2006-05-25 |
| EP1558523A1 (en) | 2005-08-03 |
| NO318861B1 (en) | 2005-05-18 |
| RU2005102602A (en) | 2005-10-10 |
| PT1558523E (en) | 2010-12-07 |
| US7563419B2 (en) | 2009-07-21 |
| EP1558523B1 (en) | 2010-09-15 |
| ES2352374T3 (en) | 2011-02-17 |
| DE60237723D1 (en) | 2010-10-28 |
| NO20023235D0 (en) | 2002-07-03 |
| AU2002330778A1 (en) | 2004-01-23 |
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