CA2291737A1 - Nozzle for dosing liquid microflux in a high-temperature environment - Google Patents
Nozzle for dosing liquid microflux in a high-temperature environment Download PDFInfo
- Publication number
- CA2291737A1 CA2291737A1 CA002291737A CA2291737A CA2291737A1 CA 2291737 A1 CA2291737 A1 CA 2291737A1 CA 002291737 A CA002291737 A CA 002291737A CA 2291737 A CA2291737 A CA 2291737A CA 2291737 A1 CA2291737 A1 CA 2291737A1
- Authority
- CA
- Canada
- Prior art keywords
- atomizing
- nozzle
- seal
- medium
- nozzle tip
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/24—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means incorporating means for heating the liquid or other fluent material, e.g. electrically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/30—Dip tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/002—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour incorporating means for heating or cooling, e.g. the material to be sprayed
Abstract
The invention relates to a device for atomizing a medium, comprising a nozzle tip with an atomization body having at least one atomization orifice, in addition to a cooling device. The invention is characterized in that the atomization orifice or each atomization orifice (7) has a diameter of less than or equal to 50 µm, in that the cooling device (8, 12) has a chamber (12) that can be cross-flown by the coolant (14) and surrounds the nozzle tip (3) so that the device can be kept at a specified temperature up to the exit of the atomization orifice (7), and in that a seal (9) is arranged behind the atomization body (6) in the direction of flow, which prevents the outflow of the medium (13) by bypassing the atomization body (6).
Description
WO 98/53916 FILE, P~N-th~'TH15 ~PCT/EP98/02956 ~E~ ~fRAl~i~l.AT6f~~
Description Nozzle for metering very small liquid streams in a high-temperature environment The invention relates to an apparatus for atomizing a medium, having a nozzle tip with an atomizing member with at least one atomizing hole and cooling means.
Such apparatuses (nozzles) are disclosed, for example, in US 5,351,889 and US 5,253,810.
A nozzle tip having an atomizing member with at least one atomizing hole is also disclosed in US 4,150,794. In this nozzle tip, which is designed specially for cutting tasks, the atomizing member is followed by a seal which prevents the emergence of the medium with bypassing of the nozzle member.
Nozzles having the features described at the outset are also used for metering very small amounts of catalyst in acetic acid pyrolysis to give ketene and water. Catalytic acetic acid pyrolysis is used industrially for the production of ketene, diketene and acetic anhydride, by the following process: acetic acid is vaporized and is preheated to the production temperature. The catalyst, e.g. triethyl phosphate, is then metered in liquid form into the acetic acid vapor by means of a cooled nozzle. The mixture is kept at the reaction temperature in a tubular reactor. After the reaction zone, cooling is carried out so that water and unconverted acetic acid condense. The further processing of the ketene depends on the subsequent product desired.
The disadvantage of this process is that, owing to the metered amount of catalyst, which is small even on a large industrial production scale, a scaling-down of the plants to the size of experimental apparatus (100-5000 g/h of acetic acid) under the same metering conditions for the catalyst with the known nozzles is not possible without coking and/or blockage impairing the operability of the known nozzles.
It was therefore the object of the invention to improve the known apparatus.
Description Nozzle for metering very small liquid streams in a high-temperature environment The invention relates to an apparatus for atomizing a medium, having a nozzle tip with an atomizing member with at least one atomizing hole and cooling means.
Such apparatuses (nozzles) are disclosed, for example, in US 5,351,889 and US 5,253,810.
A nozzle tip having an atomizing member with at least one atomizing hole is also disclosed in US 4,150,794. In this nozzle tip, which is designed specially for cutting tasks, the atomizing member is followed by a seal which prevents the emergence of the medium with bypassing of the nozzle member.
Nozzles having the features described at the outset are also used for metering very small amounts of catalyst in acetic acid pyrolysis to give ketene and water. Catalytic acetic acid pyrolysis is used industrially for the production of ketene, diketene and acetic anhydride, by the following process: acetic acid is vaporized and is preheated to the production temperature. The catalyst, e.g. triethyl phosphate, is then metered in liquid form into the acetic acid vapor by means of a cooled nozzle. The mixture is kept at the reaction temperature in a tubular reactor. After the reaction zone, cooling is carried out so that water and unconverted acetic acid condense. The further processing of the ketene depends on the subsequent product desired.
The disadvantage of this process is that, owing to the metered amount of catalyst, which is small even on a large industrial production scale, a scaling-down of the plants to the size of experimental apparatus (100-5000 g/h of acetic acid) under the same metering conditions for the catalyst with the known nozzles is not possible without coking and/or blockage impairing the operability of the known nozzles.
It was therefore the object of the invention to improve the known apparatus.
This object is achieved, according to the invention, by an apparatus of the type stated at the outset, wherein the or each atomizing hole has a diameter of less than or equal to 50 Nm, the cooling means has a space through which a coolant can flow and which surrounds the nozzle tip so that the apparatus can be thermostated up to the outlet of the atomizing hole, and a seal is arranged downstream of the atomizing member in the direction of flow, which prevents the emergence of the medium with bypassing of the atomizing member.
The invention therefore relates to an apparatus for atomizing a medium, having a nozzle tip with an atomizing member with at least one atomizing hole and a cooling means, wherein the or each atomizing hole has a diameter of less than or equal to 50 Nm, the cooling means has a space through which a coolant can flow and which surrounds the nozzle tip so that the apparatus can be thermostated up to the outlet of the atomizing hole, and a seal is arranged downstream of the atomizing member in the direction of flow, which prevents the emergence of the medium with bypassing of the atomizing member.
In a particular embodiment, the or each atomizing hole has a diameter of less than or equal to 40, preferably less than or equal to 30, particularly preferably less than or equal to 20 and very particularly preferably about 10 Nm. The seal used is advantageously a metal seal, preferably a silver seal. The atomizing member is preferably produced from an alloy which contains platinum and/or iridium.
The apparatus has at least one seal which prevents the emergence of the medium with bypassing of the atomizing member and which, based on the direction of flow of the medium, is arranged downstream of the atomizing member. This prevents abraded material from the seal from blocking the atomizing hole. In a particular embodiment, a filter, which likewise prevents blockage of the atomizing hole, is inserted upstream of the atomizing member.
The nozzle according to the invention affords the possibility of metering liquid streams smaller than 20 ml/min, preferably of 0.05-1, or up to 10 ml/min continuously in liquid form into a gas space having temperatures up to 1000°C, preferably up to 1100°C. Because the cooling is designed according to the invention, blockage of the atomizing hole, for example due to frequently observed coking of the catalyst during acetic acid pyrolysis, no longer takes place. Atomization of the catalyst as a liquid jet in a pilot apparatus has the advantage of better scale-up of the results to large plants. In addition, it was surprisingly found that metering as a liquid jet is more effective than preliminary vaporization of the catalyst and metering in gaseous form, since in the latter case virtually immediate coking of the nozzle occurred. In addition to use in the acetic acid pyrolysis, the nozzle design affords the possibility of continuously atomizing very small amounts of liquid as a fine jet into hot gases. Applications are laboratory and pilot apparatuses in which additives must be liquid.
A possible design of the nozzle according to the invention is described by way ofyexample below, with reference to the sectional side view shown in the figure. A restriction of the invention in any way is not intended by this.
The figure shows a nozzle 1 by means of a liquid 13 can be transported by means of a pump (not shown) via a stainless steel tube 2 which has a cooling jacket 8, at a pressure up to 400 bar, through the nozzle tip 3. The tip 3 contains two retaining screws 4,5 which fix an atomizing member, the nozzle plate 6, in such a way that it is pressed against the first seal 9. The nozzle plate 6 has an atomizing hole 7 with a hole diameter of 10-30 Nm.
The tube 2 and the tip 3 are surrounded by the cooling jacket 8 in such a way that the tube 2 can be thermostated up to the nozzle tip 3, and this can be done up to the outlet of the atomizing hole 7. This is achieved by surrounding the tip 3 by a space 12 which a coolant 14 can flow.
The first seal 9 prevents the liquid 13 from emerging from the nozzle tip 3 with bypassing of the nozzle plate 6 between the screws 4,5. Said seal is arranged after the nozzle plate 6. This prevents abraded material of the seal 9 from blocking the atomizing hole 7. A second seal 10 prevents emergence between the screw 4 and the wall of the tip 3. A filter 11, which likewise prevents blockage of the atomizing hole 7, is inserted between the second seal 10 and the screw 4. A conducting tube 15 creates effective distribution of the coolant 14 in the space 12 around the nozzle tip 3.
The invention therefore relates to an apparatus for atomizing a medium, having a nozzle tip with an atomizing member with at least one atomizing hole and a cooling means, wherein the or each atomizing hole has a diameter of less than or equal to 50 Nm, the cooling means has a space through which a coolant can flow and which surrounds the nozzle tip so that the apparatus can be thermostated up to the outlet of the atomizing hole, and a seal is arranged downstream of the atomizing member in the direction of flow, which prevents the emergence of the medium with bypassing of the atomizing member.
In a particular embodiment, the or each atomizing hole has a diameter of less than or equal to 40, preferably less than or equal to 30, particularly preferably less than or equal to 20 and very particularly preferably about 10 Nm. The seal used is advantageously a metal seal, preferably a silver seal. The atomizing member is preferably produced from an alloy which contains platinum and/or iridium.
The apparatus has at least one seal which prevents the emergence of the medium with bypassing of the atomizing member and which, based on the direction of flow of the medium, is arranged downstream of the atomizing member. This prevents abraded material from the seal from blocking the atomizing hole. In a particular embodiment, a filter, which likewise prevents blockage of the atomizing hole, is inserted upstream of the atomizing member.
The nozzle according to the invention affords the possibility of metering liquid streams smaller than 20 ml/min, preferably of 0.05-1, or up to 10 ml/min continuously in liquid form into a gas space having temperatures up to 1000°C, preferably up to 1100°C. Because the cooling is designed according to the invention, blockage of the atomizing hole, for example due to frequently observed coking of the catalyst during acetic acid pyrolysis, no longer takes place. Atomization of the catalyst as a liquid jet in a pilot apparatus has the advantage of better scale-up of the results to large plants. In addition, it was surprisingly found that metering as a liquid jet is more effective than preliminary vaporization of the catalyst and metering in gaseous form, since in the latter case virtually immediate coking of the nozzle occurred. In addition to use in the acetic acid pyrolysis, the nozzle design affords the possibility of continuously atomizing very small amounts of liquid as a fine jet into hot gases. Applications are laboratory and pilot apparatuses in which additives must be liquid.
A possible design of the nozzle according to the invention is described by way ofyexample below, with reference to the sectional side view shown in the figure. A restriction of the invention in any way is not intended by this.
The figure shows a nozzle 1 by means of a liquid 13 can be transported by means of a pump (not shown) via a stainless steel tube 2 which has a cooling jacket 8, at a pressure up to 400 bar, through the nozzle tip 3. The tip 3 contains two retaining screws 4,5 which fix an atomizing member, the nozzle plate 6, in such a way that it is pressed against the first seal 9. The nozzle plate 6 has an atomizing hole 7 with a hole diameter of 10-30 Nm.
The tube 2 and the tip 3 are surrounded by the cooling jacket 8 in such a way that the tube 2 can be thermostated up to the nozzle tip 3, and this can be done up to the outlet of the atomizing hole 7. This is achieved by surrounding the tip 3 by a space 12 which a coolant 14 can flow.
The first seal 9 prevents the liquid 13 from emerging from the nozzle tip 3 with bypassing of the nozzle plate 6 between the screws 4,5. Said seal is arranged after the nozzle plate 6. This prevents abraded material of the seal 9 from blocking the atomizing hole 7. A second seal 10 prevents emergence between the screw 4 and the wall of the tip 3. A filter 11, which likewise prevents blockage of the atomizing hole 7, is inserted between the second seal 10 and the screw 4. A conducting tube 15 creates effective distribution of the coolant 14 in the space 12 around the nozzle tip 3.
Claims (6)
1. An apparatus for atomizing a medium, having a nozzle tip with an atomizing member with at least one atomizing hole and a cooling means, wherein the or each atomizing hole (7) has a diameter of less than or equal to 50 µm, the cooling means (8, 12) has a space (12) through which a coolant (14) can flow and which surrounds the nozzle tip (3) so that the apparatus can be thermostated up to the outlet of the atomizing hole (7), and a seal (9) is arranged downstream of the atomizing member (6) in the direction of flow, which prevents the emergence of the medium with bypassing of the atomizing member.
2. The apparatus as claimed in claim 1, wherein a filter (11) is arranged before the atomizing member (6).
3. The use of an apparatus as claimed in at least one of claims 1 and 2 for metering liquids in liquid form into gas spaces having temperatures up to 1100°C.
4. The use as claimed in claim 3, wherein liquid streams smaller than or equal to 20 ml/min are metered.
5. The use as claimed in claim 4, wherein liquid streams of 0.05-1 ml/min are metered.
6. A process for the preparation of ketene by pyrolysis of acetic acid vapor in the presence of a catalyst, wherein the catalyst is continuously metered in the form of a liquid jet into the acetic acid vapor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722338A DE19722338A1 (en) | 1997-05-28 | 1997-05-28 | Nozzle for dosing the smallest liquid flows in a high temperature environment |
| DE19722338.9 | 1997-05-28 | ||
| PCT/EP1998/002956 WO1998053916A2 (en) | 1997-05-28 | 1998-05-20 | Nozzle for dosing liquid microflux in a high-temperature environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2291737A1 true CA2291737A1 (en) | 1998-12-03 |
Family
ID=7830746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002291737A Abandoned CA2291737A1 (en) | 1997-05-28 | 1998-05-20 | Nozzle for dosing liquid microflux in a high-temperature environment |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0983122A2 (en) |
| JP (1) | JP2001526588A (en) |
| CN (1) | CN1258235A (en) |
| CA (1) | CA2291737A1 (en) |
| DE (1) | DE19722338A1 (en) |
| WO (1) | WO1998053916A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7837235B2 (en) | 2004-01-08 | 2010-11-23 | Boehringer Ingelheim International Gmbh | Device for clamping a fluidic component |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2647760B1 (en) * | 2012-04-02 | 2017-12-27 | Valmet Technologies, Inc. | Device for treating a fiber web |
| CN113237065B (en) * | 2021-01-13 | 2022-12-27 | 重庆川维石化工程有限责任公司 | Intelligent control waste sulfuric acid cracking furnace and waste sulfuric acid cracking process |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5413020A (en) * | 1977-06-30 | 1979-01-31 | Nippon Oxygen Co Ltd | Liquid fuel burner |
| US4150794A (en) * | 1977-07-26 | 1979-04-24 | Camsco, Inc. | Liquid jet cutting nozzle and housing |
| CA1324949C (en) * | 1988-12-22 | 1993-12-07 | C-I-L Inc. | Injection nozzle |
| US5351889A (en) * | 1991-10-16 | 1994-10-04 | The United States Of America As Represented By The Secretary Of The Navy | Flow tripped injector |
| US5253810A (en) * | 1992-03-13 | 1993-10-19 | The United States Of America As Represented By The Secretary Of The Navy | High heat, high pressure, non-corrosive injector assembly |
| US5407136A (en) * | 1992-09-18 | 1995-04-18 | Iris Graphics, Inc. | Ink-jet nozzle |
| US5346133A (en) * | 1993-03-25 | 1994-09-13 | The M. W. Kellogg Company | High temperature liquid injection apparatus |
-
1997
- 1997-05-28 DE DE19722338A patent/DE19722338A1/en not_active Withdrawn
-
1998
- 1998-05-20 CA CA002291737A patent/CA2291737A1/en not_active Abandoned
- 1998-05-20 EP EP98929346A patent/EP0983122A2/en not_active Withdrawn
- 1998-05-20 JP JP50019099A patent/JP2001526588A/en active Pending
- 1998-05-20 CN CN98805541A patent/CN1258235A/en active Pending
- 1998-05-20 WO PCT/EP1998/002956 patent/WO1998053916A2/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7837235B2 (en) | 2004-01-08 | 2010-11-23 | Boehringer Ingelheim International Gmbh | Device for clamping a fluidic component |
| US9027967B2 (en) | 2004-01-08 | 2015-05-12 | Boehringer Ingelheim International Gmbh | Device for clamping a fluidic component |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998053916A2 (en) | 1998-12-03 |
| CN1258235A (en) | 2000-06-28 |
| DE19722338A1 (en) | 1998-12-10 |
| EP0983122A2 (en) | 2000-03-08 |
| JP2001526588A (en) | 2001-12-18 |
| WO1998053916A3 (en) | 1999-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |