WO1999059699A2 - Verfahren und vorrichtung zum reinigen von trocknungsabgasen - Google Patents
Verfahren und vorrichtung zum reinigen von trocknungsabgasen Download PDFInfo
- Publication number
- WO1999059699A2 WO1999059699A2 PCT/EP1999/003382 EP9903382W WO9959699A2 WO 1999059699 A2 WO1999059699 A2 WO 1999059699A2 EP 9903382 W EP9903382 W EP 9903382W WO 9959699 A2 WO9959699 A2 WO 9959699A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exhaust gases
- vortex tube
- outlet opening
- dust
- laden
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/08—Vortex chamber constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
Definitions
- the present invention relates to a method for cleaning drying exhaust gases when drying wood chips, wood fibers or the like by means of heating gases generated in a combustion chamber, in which the dried material is separated from the drying exhaust gases. Furthermore, the invention is directed to a device for cleaning drying exhaust gases when drying wood chips, wood fibers or the like by means of heating gases generated in a combustion chamber, in particular for carrying out the method mentioned at the beginning.
- the dried chips are separated from the drying exhaust gases after exiting the combustion chamber, via a separating device, for example a cyclone, and fed to further utilization, for example a scattering device.
- a separating device for example a cyclone
- the drying exhaust gases separated from the chips are relatively heavily laden with dust (approx. 100 to 500 mg / m 3 ), so that they must not be discharged directly into the environment, but must go through a cleaning process.
- the dust-laden drying exhaust gases are cleaned, for example, in filter units, whereupon the cleaned exhaust gases can be discharged into the environment.
- the object of the invention is to develop a method and a device of the type mentioned in the introduction such that the production costs and the operating costs of a corresponding device, in particular the effort for filtering the dust-laden drying exhaust gases, can be reduced.
- a device comprises a separating device for separating the dried goods from the drying exhaust gases and a vortex tube for separating the drying exhaust gases, which are interspersed with particle dust, into cleaned and dust-laden exhaust gases.
- a vortex tube is thus used for the subsequent division of the particles freed from the particles but permeated with particle dust
- Drying exhaust gases used in cleaned and dust-laden exhaust gases Use is therefore made of the high separation quality of a vortex tube, with the result that the drying exhaust gases fed to the vortex tube are separated into a portion with a very high dust load and a portion that is practically completely cleaned.
- the fully cleaned portion can thus be fed directly into the environment without the need for additional filtering.
- the remaining dust-laden portion is significantly reduced compared to the volume flow at the inlet of the vortex tube, so that either significantly smaller filter systems are used or the remaining dust portions can be disposed of, for example, by incineration.
- the combustion can advantageously be carried out by returning the drying exhaust gases which are permeated with the residual dust to the combustion chamber.
- a 50:50 split of the drying exhaust gases into cleaned and dust-laden exhaust gases will usually take place in the vortex tube, the official regulations of 20 mg / m 3 clean gas for the fully cleaned portion being able to be achieved without problems.
- a major advantage of the invention is thus that the critical volume of the drying exhaust gases to be cleaned can be significantly reduced.
- the diameter of a vortex tube used is advantageously between 30 cm and 5 m, in particular between 1 and 3 m.
- the temperature of the swirl tube and / or of the drying exhaust gases introduced into the swirl tube can advantageously be increased. If there is a temperature above the dew point (approx. 60-70 ° C) within the vortex tube, baking or sticking is reliably prevented.
- the vortex tube can be provided with appropriate insulation means.
- the vortex tube preferably comprises a first and a second end-side outlet opening, each of which can be adjusted in size and / or shape.
- the first end opening is preferably designed as a diaphragm opening, in particular as a variable diaphragm opening, while a throttle valve is advantageously provided on the second end opening.
- the separation effect can be set exactly and in particular can be flexibly reacted to fluctuations in the air quantity at the inlet of the vortex tube as well as to different proportions of adhesives or other ingredients in the supplied air flow.
- Fig. 1 shows an inventive device for cleaning
- FIG. 2 shows a schematic sectional illustration of a vortex tube
- FIG. 3 shows a further embodiment of the invention
- Fig. 8 shows a corresponding embodiment in vacuum operation
- Fig. 9 shows a device for cleaning waste water.
- dried particles for example chips
- a dryer drum 1 via a pipeline 2 and a fan 3 to a particle separator, for example a cyclone 4.
- the dried particles are separated from the drying exhaust gases and fed to their further use via a discharge line 5.
- the drying exhaust gases freed from the particles are fed via an exhaust gas line 6 to a feed opening 7 of a vortex tube 8, these drying exhaust gases being loaded with particle dust and aerosols.
- the vortex tube 8 has a first end opening 9 from which exhaust gases largely freed of particle dust and / or aerosols are emitted. to step. These exhaust gases are cleaned to the extent that they can be discharged directly into the environment, for example.
- a second end-side outlet opening 10 is provided, from which exhaust gases which are permeated with particle dust and / or the aerosols emerge. These exhaust gases are returned via a pipe 11 to, for example, a combustion chamber 12 of the dryer drum 1.
- the volume of the cleaned exhaust gases discharged from the outlet opening 9 is between 0 and 50% of the drying exhaust gases fed to the vortex tube 8. Accordingly, the volume of the dust-laden exhaust gases discharged from the outlet opening 10 is between 50 and 100%.
- the drying exhaust gases discharged from the outlet opening 9 are practically completely cleaned and can thus be fed directly to the environment, while at the same time the dust-laden exhaust gas flow can be reduced to up to 50% of the original volume.
- the amount of critical exhaust gas flow can thus be significantly reduced by the device according to the invention.
- the outlet opening 9 is formed by an aperture 13.
- This diaphragm is preferably designed to be adjustable, so that both the size, the shape and the position of the outlet opening 9 can be changed. Furthermore, the position of the diaphragm 13 can be adjustable in the longitudinal direction of the swirl tube.
- a schematically illustrated throttle 14 is provided, which can optionally be of variable design.
- the size of the outlet opening 10 can also be set, as a result of which the separation effect of the vortex tube 8 can be adjusted.
- Different chokes with different shapes can also be used here, so that an optimal separation result can be achieved.
- Particle-containing exhaust gases are fed directly to a swirl tube 15 via the pipeline 2 and the fan 3. Particles and drying exhaust gases are separated via the vortex tube 15, the particles being fed to the cyclone 4 together with a residual portion of exhaust gases via an outlet opening 16 and a pipeline 17.
- the cyclone 4 can be made smaller than in the device according to FIG. 1, since the amount of exhaust gas to be cleaned in the cyclone was reduced by the splitting in the vortex tube 15.
- the dust gases or exhaust gases loaded with aerosols are fed from the outlet opening 18 via a pipeline 19 to a second vortex tube 8, the function of which corresponds to that of the vortex tube 8 according to FIG. 1.
- this vortex tube 8 with dust and / or aerosols loaded exhaust gases separated into cleaned exhaust gases and contaminated exhaust gases.
- the cleaned exhaust gases can be fed directly to the environment, while the contaminated exhaust gases are fed to the combustion chamber 12 or a filter device, for example.
- the particles separated in the cyclone 4 are fed via the discharge line 5 for further use, while the waste gases obtained in this separation process, loaded with dust and / or aerosols, via the pipe 6 the contaminated exhaust gas stream emerging from the outlet opening 18 of the vortex tube 15 be fed.
- the structure and functionality of the vortex tube 8 according to FIG. 3 corresponds completely to the structure and functionality of the vortex tube 8 according to FIG. 1.
- the vortex tube 15 can also be designed accordingly, in particular the outlet openings 16 and 18 can also be designed variably here.
- the drying exhaust gases emerging from the drying drum 1 and containing the particles are first fed to a cyclone 4 and the exhaust gases loaded with dust and / or aerosols are fed to the vortex tube 8 as in the device according to FIG. 1.
- the fan is
- the fan 1 is not penetrated by particles in this way, whereby the wear on the fan 3 is significantly reduced. Since, in the devices according to FIGS. 1 and 3, the particles emerging from the drying drum 1 are passed through the fan, for example at a pressure of 5 to 8 bar, in these embodiments there is a correspondingly high level of wear on the fan 3.
- FIG. 4 also shows that the contaminated exhaust gases emerging from the outlet opening 10 of the vortex tube 8 are fed to a filter device 20 in which the particle dust and / or the aerosols are filtered out and discharged via a discharge line 21.
- the cleaned exhaust gases are fed via a line 22 to the cleaned exhaust gases emerging from the outlet opening 9 of the vortex tube 8 and, together with the latter, are fed via the fan 3 to a further separating device, not shown, for separation into cleaned and into residual waste gases laden with dust and / or aerosols.
- This separating device can, for example, again be designed as a vortex tube.
- the exhaust gases loaded with residual dust can be fed to the combustion chamber via a line 24, for example.
- the device according to FIG. 5 is designed similarly to the device according to FIG. 3, but the vortex tube 15 is operated in the negative pressure mode and only the vortex tube 8 in the positive pressure mode. Accordingly, the fan 3 is arranged in the flow direction behind the vortex tube 15, so that the vortex tube 3 is not subjected to excess pressure, but rather to negative pressure.
- the remaining elements correspond in their arrangement, their structure and their functionality completely to the other elements according to FIG. 3.
- Fig. 6 shows a device for cleaning drying exhaust gases, as it can be used in fiber drying.
- the device is constructed similarly to the device according to FIG. 4, the same elements being designated with the same reference numbers as FIG. 4.
- a fiber stream is fed to the cyclone 4 from a dryer tube 25 via the pipeline 2.
- a separation of fibers and dust-laden exhaust gases is carried out in the cyclone 4, the fibers being fed via the discharge line 5 for further use.
- the dust-laden exhaust gases are fed via the exhaust gas line 6 to the swirl tube 8, in which a separation into cleaned and dust-laden exhaust gases takes place.
- the dust-laden exhaust gases are fed via a discharge opening 10 and a pipe to a scrubber 27, which is supplied with water via a pipe 28.
- the solids emerging from the scrubber 27 are fed to the combustion, for example, via a line 29, while those with water water offset, cleaned exhaust gases are fed via a line 30 to another vortex tube 31.
- a separation into cleaned and unpurified exhaust gases takes place in the vortex tube 31, the unpurified exhaust gases being fed via an outlet opening 32 to a droplet separator 33 for the separation of water and exhaust gases.
- the water discharged via a discharge line 34 is largely freed of impurities and can be reused, for example.
- the cleaned exhaust gases emerging from the outlet opening 9 of the vortex tube 8, which comprise, for example, approximately 80% of the exhaust gases fed to the vortex tube 8, are fed to a branch point 35 at which a part of the cleaned circulating air, for example approximately 30%, is used for heating - Nes dryer 36 are removed for the drying tube 25.
- the remaining part of the cleaned exhaust gases is fed, for example, directly to the environment via a line 37.
- the cleaned exhaust gases emerging from a second outlet opening 38 of the vortex tube 31 and the cleaned exhaust gases emerging from an outlet opening 39 of the droplet separator 33 are also fed to the line 37 and discharged into the environment.
- all of the vortex tubes shown in FIG. 6 can be variably adjustable as already described.
- a fan 3 can be provided in the feed line 2, so that the device operates in overpressure mode.
- the fan for example, in the exhaust line 6 or in the line 37, in particular in the flow direction after the confluence of the vortex tube 31 and the droplet separator 33, so that the device operates in negative pressure mode. This enables the advantages of vacuum operation already described to be achieved.
- the dust-laden exhaust air originating, for example, from a grinding machine 40 is fed to the vortex tube 8 via the fan 3.
- a separation into dust-laden exhaust air and cleaned exhaust air is carried out in the vortex tube 8, the dust-laden exhaust air being fed to the filter device 20 via the outlet opening 10 of the vortex tube 8.
- the dust filtered out via the filter device 20 is discharged via the discharge line 21, while the filtered exhaust air is fed via line 22 to the cleaned exhaust air emerging from the outlet opening 9 of the vortex tube 8.
- the fan 3 can also be arranged in the line 23, in particular in the flow direction after the junction of the line 22, so that the device works in the vacuum mode.
- FIG. 8 shows a device for cleaning press exhaust air, in which the exhaust air coming from a press 41 is fed to the vortex tube 8 via the pipeline 2.
- the hot exhaust air at the press outlet for example 150 to 180 ° C., is usually dust, oil and / or steam-laden, so that a separation into contaminated and cleaned exhaust air takes place in the vortex tube 8.
- the contaminated exhaust air is fed via the outlet opening 10 of the vortex tube 8 to a plurality of separators 42 designed, for example, as wet washers or as electrostatic filters, in which liquids and solids are separated from the exhaust air and discharged via the discharge line 21.
- the cleaned exhaust air is fed via line 22 to the cleaned exhaust air emerging from the outlet opening 9 of the vortex tube 8 and is discharged into the environment via the fan 3.
- the device described works in negative pressure mode. In principle, it is also possible to provide the fan 3 in the line 2 so that the device operates in overpressure mode.
- FIG. 9 shows a device for purifying waste water, in which the waste water to be cleaned is fed to a waste water collector 43 and introduced into the vortex tube 8 via a pump 44.
- the solids present in the wastewater are separated from the water, so that the solids-free wastewater can be fed via the outlet opening 9 and a pipeline 45 to a post-purification plant, for example a biological sewage treatment plant, while the solids-laden waste water is brought via the outlet opening 10 and a line 46 to a dewatering device, for example a centrifuge or a belt press.
- a post-purification plant for example a biological sewage treatment plant
- a dewatering device for example a centrifuge or a belt press.
- a division of the wastewater volume is achieved, for example, in a ratio of 80:20 from solids-free to solids-laden wastewater, whereby it is essential that a significant reduction in the volume of the critical, solids-laden wastewater is achieved by the vortex tube.
- the vortex tubes can be designed to be variably adjustable, as described in the introduction, so that they can be optimally adjusted to the respective operating case. Furthermore, all of the devices described can in principle operate both in negative pressure and in positive pressure mode.
- two or more vortex tubes can be arranged in parallel or in a cascade connection.
- the cleaned exhaust gases can still contain aerosols, which can lead to the development of odors. In this case, additional filtering of these aerosols can be useful.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separating Particles In Gases By Inertia (AREA)
- Drying Of Solid Materials (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19980877T DE19980877D2 (de) | 1998-05-19 | 1999-05-17 | Verfahren und Vorrichtung zum Reinigen von Trocknungsabgasen |
AU42630/99A AU4263099A (en) | 1998-05-19 | 1999-05-17 | Method and device for purifying waste gases used in drying |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19822486.9 | 1998-05-19 | ||
DE1998122486 DE19822486A1 (de) | 1998-05-19 | 1998-05-19 | Verfahren und Vorrichtung zum Reinigen von Trocknungsabgasen |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999059699A2 true WO1999059699A2 (de) | 1999-11-25 |
WO1999059699A3 WO1999059699A3 (de) | 2000-06-22 |
Family
ID=7868308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/003382 WO1999059699A2 (de) | 1998-05-19 | 1999-05-17 | Verfahren und vorrichtung zum reinigen von trocknungsabgasen |
Country Status (4)
Country | Link |
---|---|
AR (1) | AR015792A1 (de) |
AU (1) | AU4263099A (de) |
DE (2) | DE19822486A1 (de) |
WO (1) | WO1999059699A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112023579B (zh) * | 2020-08-19 | 2022-04-29 | 刘大海 | 一种有机废物处理用高效型废气净化设备的使用方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2061925A1 (de) * | 1970-12-16 | 1972-08-17 | Büttner-Schilde-Haas AG, 4150 Krefeld | Verfahren zum Entstauben der Brüden aus Holzspänetrocknungsanlagen |
US4888884A (en) * | 1987-05-11 | 1989-12-26 | Bison-Werke Baehre | Method and plant for cleaning dryer exhaust gases during the drying of wood chips, wood fiber of the like |
US5391294A (en) * | 1991-03-28 | 1995-02-21 | Codiex (S.N.C.) | Particle separator device with circulation of fluid, with double effect of extraction |
DE29520315U1 (de) * | 1995-12-21 | 1997-04-17 | Sibbertsen Walter Prof | Vorrichtung zum Abschneiden von Staub u.dgl. aus einem Gas |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2930689B2 (ja) * | 1990-09-11 | 1999-08-03 | 本田技研工業株式会社 | 流体浄化装置 |
-
1998
- 1998-05-19 DE DE1998122486 patent/DE19822486A1/de not_active Ceased
-
1999
- 1999-05-17 WO PCT/EP1999/003382 patent/WO1999059699A2/de active Application Filing
- 1999-05-17 DE DE19980877T patent/DE19980877D2/de not_active Ceased
- 1999-05-17 AU AU42630/99A patent/AU4263099A/en not_active Abandoned
- 1999-05-19 AR ARP990102376 patent/AR015792A1/es unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2061925A1 (de) * | 1970-12-16 | 1972-08-17 | Büttner-Schilde-Haas AG, 4150 Krefeld | Verfahren zum Entstauben der Brüden aus Holzspänetrocknungsanlagen |
US4888884A (en) * | 1987-05-11 | 1989-12-26 | Bison-Werke Baehre | Method and plant for cleaning dryer exhaust gases during the drying of wood chips, wood fiber of the like |
US5391294A (en) * | 1991-03-28 | 1995-02-21 | Codiex (S.N.C.) | Particle separator device with circulation of fluid, with double effect of extraction |
DE29520315U1 (de) * | 1995-12-21 | 1997-04-17 | Sibbertsen Walter Prof | Vorrichtung zum Abschneiden von Staub u.dgl. aus einem Gas |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 16, no. 383 (C-0974), 17. August 1992 (1992-08-17) & JP 04 122463 A (HONDA MOTOR CO), 22. April 1992 (1992-04-22) * |
Also Published As
Publication number | Publication date |
---|---|
DE19822486A1 (de) | 1999-12-02 |
AR015792A1 (es) | 2001-05-16 |
AU4263099A (en) | 1999-12-06 |
DE19980877D2 (de) | 2001-10-04 |
WO1999059699A3 (de) | 2000-06-22 |
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