DE9300150U1 - Wire mesh made of platinum alloys for ammonia oxidation - Google Patents
Wire mesh made of platinum alloys for ammonia oxidationInfo
- Publication number
- DE9300150U1 DE9300150U1 DE9300150U DE9300150U DE9300150U1 DE 9300150 U1 DE9300150 U1 DE 9300150U1 DE 9300150 U DE9300150 U DE 9300150U DE 9300150 U DE9300150 U DE 9300150U DE 9300150 U1 DE9300150 U1 DE 9300150U1
- Authority
- DE
- Germany
- Prior art keywords
- nets
- ammonia
- edge
- platinum alloys
- resistant
- 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.)
- Expired - Lifetime
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims description 24
- 229910021529 ammonia Inorganic materials 0.000 title claims description 12
- 230000003647 oxidation Effects 0.000 title claims description 11
- 238000007254 oxidation reaction Methods 0.000 title claims description 11
- 229910001260 Pt alloy Inorganic materials 0.000 title claims description 7
- 239000010970 precious metal Substances 0.000 claims description 12
- 239000010953 base metal Substances 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000003197 catalytic effect Effects 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000012210 heat-resistant fiber Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 238000009940 knitting Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000629 Rh alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/20—Metallic fibres
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2403/00—Details of fabric structure established in the fabric forming process
- D10B2403/02—Cross-sectional features
- D10B2403/024—Fabric incorporating additional compounds
- D10B2403/0242—Fabric incorporating additional compounds enhancing chemical properties
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Textile Engineering (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
- Inorganic Fibers (AREA)
- Knitting Of Fabric (AREA)
Description
Degussa Aktienge se LLscha ftDegussa Aktienge se LLscha ft
Weissfrauenstraße 9, W-6000 Frankfurt am MainWeissfrauenstrasse 9, W-6000 Frankfurt am Main
93 101 EM93 101 EM
Drahtnetze aus Platinlegierungen zur AmmoniakoxydationWire mesh made of platinum alloys for ammonia oxidation
Beschreibung:Description:
Die Neuerung betrifft gestrickte oder gewirkte Drahtnetze aus Platinlegierungen zur katalytischen Oxydation von Ammoniak, die in einem Ammoniakverbrennungsofen in einem umlaufenden Flansch befestigt sind.The innovation concerns knitted or warp-knitted wire nets made of platinum alloys for the catalytic oxidation of ammonia, which are attached to a circumferential flange in an ammonia combustion furnace.
Für die katalytische Oxydation von Ammoniak zu Stickoxiden bei der Salpetersäureherstellung verwendet man Verbrennungsanlagen, die mit Platinkatalysatoren in Form von feinmaschigen Drahtnetzen ausgestattet sind. Man leitet hierbei ein Ammoniak-Luft-Gemisch über ein normalerweise horizontal angeordnetes Katalysator-System aus mehreren, unmittelbar aufeinanderliegenden Einzelnetzen aus Platinlegierungsdrähten und verbrennt es dort bei Temperaturen von 750 bisFor the catalytic oxidation of ammonia to nitrogen oxides in the production of nitric acid, combustion plants equipped with platinum catalysts in the form of fine-mesh wire nets are used. An ammonia-air mixture is passed over a normally horizontally arranged catalyst system made up of several individual nets of platinum alloy wires lying directly on top of one another and is burned there at temperatures of 750 to
950 C. Die Katalysatornetze werden dabei innerhalb des Ammoniakverbrennungsofens in einen Flansch eingespannt, der auf der Innenseite der Seitenwandung des Ofens angebracht ist. Eine solche Befestigungsvorrichtung ist beispielsweise in der DE-PS 27 54 643 beschrieben. Zur Abdichtung der Netze dienen Dichtunspackungen, die oberhalb und unterhalb des Netzpakets im Flansch eingelegt sind.950 C. The catalyst nets are clamped into a flange inside the ammonia combustion furnace, which is attached to the inside of the side wall of the furnace. Such a fastening device is described, for example, in DE-PS 27 54 643. Sealing packs are used to seal the nets, which are inserted above and below the net package in the flange.
Die Herstellung der Katalysatornetze erfolgt bisher in der Weise, daß aus Platin-Rhodium-Legierungsdrähten Endlosbahnen gewebt werden, aus denen die meist runden Katalysatornetze herausgeschnitten werden müssen. Dabei entsteht unverhältnismäßig viel Abfall, der wiederaufgearbeitet werden muß. Außerdem besteht die gesamte Netzfläche aus Edelmetall, obwohl der in den Befestigungsflansch eingespannte Netzrand von bis zu 50 mm Breite nicht zum Stickoxidumsatz beträgt.The production of catalyst nets has so far been carried out by weaving endless webs from platinum-rhodium alloy wires, from which the mostly round catalyst nets have to be cut out. This creates a disproportionate amount of waste that has to be reprocessed. In addition, the entire net surface is made of precious metal, although the net edge of up to 50 mm wide clamped into the fastening flange does not contribute to the nitrogen oxide conversion.
In jüngster Zeit*sind Verfahren bekanntgeworden, solche Netze zu stricken (z.B. EP-PS Q 364 153). Doch auch hier bestehen die Netze vollflächig aus Edelmetallen.Recently*, methods for knitting such nets have become known (e.g. EP-PS Q 364 153). But here too, the nets consist entirely of precious metals.
Während des Betriebs der Ammoniakverbrennungsanlage unterliegen die Netze hohen thermischen und mechanischen Beanspruchungen. Insbesondere an der Einspannkante der Netze am Befestigungsflansch können sehr hohe mechanische Beanspruchungen auftreten, denen Edelmetalldrähte nicht immer gewachsen sein können. Man hat daher bereits Netze hergestellt (DE-AS 23 41 624), bei denen ein Teil der Edelmetalldrähte innerhalb der Netze durch Drähte aus oxydationsbeständigen und warmfesten Unedelmetallegierungen ersetzt waren. Diese Art der Netze konnten sich in der Praxis jedoch nicht durchsetzen, da ihre Anwendung mit Ausbeuteverlusten verbunden war.During operation of the ammonia combustion plant, the nets are subject to high thermal and mechanical stresses. Very high mechanical stresses can occur, particularly at the clamping edge of the nets on the mounting flange, which precious metal wires cannot always cope with. Nets have therefore already been produced (DE-AS 23 41 624) in which some of the precious metal wires within the nets were replaced by wires made of oxidation-resistant and heat-resistant base metal alloys. However, this type of net could not prevail in practice because its use was associated with yield losses.
Es war daher Aufgabe der vorliegenden Neuerung, gestrickte oder gewirkte Drahtnetze aus Platinlegierungen zur katalytischen Oxydation von Ammoniak zu entwickeln, die im Ammoniakverbrennungsofen in einem umlaufenden Flansch befestigt sind, wobei diese im Bereich der Befestigung mechanisch stabiler als die bisher bekannten Netze sein sollten und bei denen teures Edelmetall eingespart werden sollte.The aim of this innovation was therefore to develop knitted or woven wire nets made of platinum alloys for the catalytic oxidation of ammonia, which are attached to a circumferential flange in the ammonia combustion furnace, whereby these should be mechanically more stable in the area of attachment than the previously known nets and in which expensive precious metal should be saved.
Diese Aufgabe wird neuerungsgemäß dadurch gelöst, daß der äußere Rand der Netze im Bereich der Flanschbefestigung aus oxydationsbeständigen und warmfesten Unedelmetalldrähten besteht.This task is solved in accordance with the innovation by the fact that the outer edge of the nets in the area of the flange fastening consists of oxidation-resistant and heat-resistant base metal wires.
Vorteilhafterweise ist der Rand aus Unedelmetalldrähten in Intarsientechnik an das runde Edelmetallnetz angestrickt.Advantageously, the edge made of base metal wires is knitted onto the round precious metal net using an intarsia technique.
Weiterhin ist es vorteilhaft, wenn in den Rand der Netze zusätzlich hitzebeständige Fasern aus einem Dichtungsmaterial eingestrickt sind.It is also advantageous if heat-resistant fibres made of a sealing material are knitted into the edge of the nets.
Durch die neue Technik des Strickens und Wirkens ist es möglich, gestrickte und gewirkte Edelmetallnetze herzustellen, deren Randabschnitte, die in den Befestigungsflansch eingespannt sind, aus Drähten bestehen, die aus oxydationsbeständigen und warmfesten Unedelmetallegierungen gefertigt sind. Damit wird erreicht, daß die Edelmetallnetze am Rand, an dem sie befestigt sind, eine höhere mechanische Festigkeit aufweisen.The new knitting and weaving technique makes it possible to produce knitted and warp-knitted precious metal nets whose edge sections, which are clamped into the fastening flange, consist of wires made of oxidation-resistant and heat-resistant base metal alloys. This means that the precious metal nets have a higher mechanical strength at the edge to which they are attached.
Außerdem wird in diesem Bereich das teure Edelmetall eingespart. Vorzugsweise erfolgt das Anstricken des Randes in der bekannten Intarsientechnik. Als Material für diese Unedelmetalldrähte können beispielsweise aluminiumhaltige Heizleiterlegierungen verwendet werden.In addition, expensive precious metal is saved in this area. The edge is preferably knitted using the well-known intarsia technique. Heat conductor alloys containing aluminum can be used as a material for these base metal wires.
Das Einstricken von hitzebeständigen Fasern aus Dichtungsmaterial in den Rand aus Unedelmetalldrähten bringt den Vorteil einer besseren Abdichtung. Außerdem entfällt der bei*der Montage des Netzpakets erforderliche Aufwand für das Einlegen der üblicherweise verwendeten Oichtungspackungen.Knitting heat-resistant fibers of sealing material into the edge made of base metal wires brings the advantage of better sealing. In addition, the effort required to insert the sealing packings normally used when assembling the net package is eliminated.
Die Abbildung zeigt schematisch ein neuerungsgemäßes Netz in beispielhafter Ausführungsform. An das rundgestrickte Edelmetallnetz (2) ist ein Rand (1) aus Unedelmetalldrähten angestrickt.The illustration shows a schematic representation of an innovative net in an exemplary embodiment. An edge (1) made of non-precious metal wires is knitted onto the circular knitted precious metal net (2).
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9300150U DE9300150U1 (en) | 1993-01-08 | 1993-01-08 | Wire mesh made of platinum alloys for ammonia oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9300150U DE9300150U1 (en) | 1993-01-08 | 1993-01-08 | Wire mesh made of platinum alloys for ammonia oxidation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE9300150U1 true DE9300150U1 (en) | 1993-03-04 |
Family
ID=6887918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE9300150U Expired - Lifetime DE9300150U1 (en) | 1993-01-08 | 1993-01-08 | Wire mesh made of platinum alloys for ammonia oxidation |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE9300150U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3779005A1 (en) * | 2019-08-16 | 2021-02-17 | Umicore Ag & Co. Kg | Knitting of precious metal nets with common material at the periphery, net from precious metal obtained thereby and a process using the precious metal net |
-
1993
- 1993-01-08 DE DE9300150U patent/DE9300150U1/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3779005A1 (en) * | 2019-08-16 | 2021-02-17 | Umicore Ag & Co. Kg | Knitting of precious metal nets with common material at the periphery, net from precious metal obtained thereby and a process using the precious metal net |
| WO2021032644A1 (en) * | 2019-08-16 | 2021-02-25 | Umicore Ag & Co. Kg | Knitting of noble metal nets using ignoble materials at the edge, noble metal net produced in this way and a method for using the noble metal net |
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