CA3082087A1 - Device for collecting and removing gases in an aluminum reduction cell - Google Patents
Device for collecting and removing gases in an aluminum reduction cellInfo
- Publication number
- CA3082087A1 CA3082087A1 CA3082087A CA3082087A CA3082087A1 CA 3082087 A1 CA3082087 A1 CA 3082087A1 CA 3082087 A CA3082087 A CA 3082087A CA 3082087 A CA3082087 A CA 3082087A CA 3082087 A1 CA3082087 A1 CA 3082087A1
- Authority
- CA
- Canada
- Prior art keywords
- gas
- height
- collecting
- channel
- caps
- 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.)
- Granted
Links
- 239000007789 gas Substances 0.000 title claims abstract description 178
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 230000009467 reduction Effects 0.000 title claims description 64
- 239000003792 electrolyte Substances 0.000 claims description 15
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009856 non-ferrous metallurgy Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/22—Collecting emitted gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention relates to the production of aluminum in electrolysis cells with baked anodes. A device comprises a system of gas ducts and gas-collecting caps. Each of the caps is connected by a first channel to a horizontal gas duct so as to form a main gas removal circuit, and is connected by a second channel to an additional gas duct so as to form an additional gas removal circuit. The height of each subsequent channel of the main loop is increased by 16-24% of the height of the preceding channel, and the height of each subsequent channel of the additional loop is increased by 24-26% of the height of the preceding channel. Separator plates are mounted inside the caps. The length of each subsequent plate is reduced with respect to the preceding by 25-35%. The technical effect is to reduce the volumes of gases removed from the electrolysis cell, and to maintain gas removal efficiency.
Description
DEVICE FOR COLLECTING AND REMOVING GASES IN AN
ALUMINUM REDUCTION CELL
Field of the Invention The invention relates to non-ferrous metallurgy, in particular, to the production of aluminum in reduction cells with prebaked anodes, and can be used to reduce the volumes of removed gases from the reduction cell while maintaining high removal efficiency both between routine operations and durinu, routine operations when reduction cells are unsealed, i.e. hooding covers are open.
Prior Art A device is known, wherein a gas-collecting cap contacts the crust at the crust opening. The purpose of this invention is to collect off-gases from the reduction cell in order to strip them of alumina fluorine compounds (patent US 4,770,752, 1988).
The drawbacks of the known device include limitations of said invention related to maintenance of the alumina feed system, located inside the cap, and possible damage during anode replacement since the cap is situated close to the anodes and crust.
A device is known, wherein a standard amount of process gases is removed between routine operations, and an increased amount of process gases is removed when opening the anode shell covers by activating an additional exhausting fan. A
separator wall is mounted inside the hooding to direct the streams upward into gas channels to reduce emissions into the potroom (patent RU 2251593 C2, 1PC C25C3/20, Publ. 11.15.2000).
The drawback of the analog device is that, upon unsealing the reduction cell, a stream of air drawn under the hooding displaces the electrolysis gases along the reduction cell and creates stagnant regions with elevated concentrations of electrolysis gases under the bottom flange of the collector beam. In these regions, the gases escape into the working zone of the potroom through the gaps between the anode rods and the flange, as well as through the gaps between hooding covers.
Date Recue/Date Received 2020-05-07 A device for collecting and removing gases from an aluminum reduction cell is known as disclosed in patent RU 2553137, C25C 3/22 Publ. 06.10.2015, comprising a collector beam with top and bottom stiffening rings and double vertical walls, between which, in the top part of the collector beam along the vertical walls, the main gas duct channels of the variable cross-section are formed with confusors located along the longitudinal axis of the collector beam above the anodes, with one end secured at the fairing inlet and the other end with openings at the bottom stiffening ring, with the height of the main gas duct channels increasing towards the end of the collector beam connected to the gas stripping system.
Two additional gas duct channels of the variable cross-section are located between the top and bottom stiffening rings symmetrically with respect to the longitudinal axis of the collector beam, which are connected to the bottom stiffening ring with confusors equipped with shutters and located along the longitudinal axis above the anodes between the confusors of the main gas duct channel, wherein each main gas duct channel has a confusor mounted at its front side in the metal extraction zone.
The drawback of the provided device is that a local increase of rarefaction in the zone of anode replacement is provided in the device without equalizing the rarefaction under the entire hooding. To this end, additional gas ducts are included, connected to confusors that are equipped with automatic shutters. Through the openings, with doors removed for anode replacement, a large volume of air is drawn under the hooding, with swirling streams forming and propagating under the entire hooding. As a result, confusors in other zones of the hooding cannot manage gas removal, and the gas escapes into the potroom through leaks in the hooding.
The provided device does not ensure efficient gas removal during anode replacement.
The closest invention to the claimed invention in terms of technical essence is a device for collecting hot off-gas emerging in the course of reduction disclosed in patent WO 2010/033037 Al, IPC C25C3/22, Publ. 03.25.2010, which has been selected as the prior art. In the device, the gas removal cap is located immediately above the crust opening and ensures a lower total volume of the gas removed from Date Recue/Date Received 2020-05-07 the reduction cell at a higher concentration of CO2 and elevated temperature, reducing the number of gas stripping units and increasing the heat exchange potential. In addition, the gas-collecting cap has at least two inlets, i. e.
it has double walls. The inlet speed between the double walls significantly exceeds the speed at the cap center, providing additional draft that creates an artificial air wall, ensuring more efficient collection of off-gases and reducing interference from transversal streams.
Drawbacks of the prior art device:
The prior art cap design ensures efficient removal of electrolysis gases by i0 the double walls, which create an artificial air wall and reduce interference from transversal streams. In this case, cap displacement away from the breakers will render gas removal inefficient, and during operation in aggressive environments, positioning the cap immediately above the crust opening will result in damage to the control mechanisms for the streams of the reduction cell reflector and feeder.
The desirable range of cap positioning above the crust, being 10-1,000 mm, is determined by the speed of alumina carry-over and the possibility of replacing the anodes. To meet this requirement, the cap mounting height should be changed for different operations, which disturbs the tightness of the device for removing gases.
Efficient gas removal from the reduction cell requires equal volumes of gas removal from all the caps positioned under the hooding of the reduction cell.
This requires equal rarefaction levels at each cap inlet; however, the prior art device has no system to control uniform gas intake under the hooding of the reduction cell.
In the device disclosed in WO 2010/033037, the cap for process gas collection may be mounted next to the feeder, rather than being an integral part of it. In this case, the bulk of the gases will be drawn at the cap periphery;
however, this requires uniform gas intake along the cap base length.
When replacing the anodes, the hooding doors are opened and air drawn through the resulting opening forms swirling streams that displace the gas into one end of the reduction cell such that the caps in that zone cannot manage removal of Date Recue/Date Received 2020-05-07 the increased gas volume. Furthermore, the air wall prevents drawing in the transversal streams of gas that evolves through large breaks formed in the electrolyte crust where the anodes are being removed.
Thus, the prior art device does not ensure efficient removal of electrolysis gases, both between routine operations of reduction cell operation and during routine operations. Furthermore, the equipment positioned under the hooding experiences high stresses from an aggressive environment.
Disclosure of the Invention The invention is intended to reduce heat losses with off-gases from the reduction cell and to relieve the stress on gas stripping units, while maintaining gas removal efficiency.
The stress on the gas stripping facilities is determined by the volume of gases removed from the reduction cells. The total volume of gases removed from a reduction cell with baked anodes is 3,000-20,000 nm3/h, of which only 1-2% are electrolysis gases, with the remainder being air. The efficiency of gas removal from a reduction cell is determined by the efficiency coefficient of the system of gas removal from the reduction cell. This value is usually 98%.
The technical result of the claimed invention is a several-fold reduction in the total volume of gases removed from a reduction cell due to decreased air volume, while ensuring the following conditions.
1. The efficiency coefficient of the gas removal system is maintained at 98% or higher, both between routine operations of reduction cell operation and during routine operations.
ALUMINUM REDUCTION CELL
Field of the Invention The invention relates to non-ferrous metallurgy, in particular, to the production of aluminum in reduction cells with prebaked anodes, and can be used to reduce the volumes of removed gases from the reduction cell while maintaining high removal efficiency both between routine operations and durinu, routine operations when reduction cells are unsealed, i.e. hooding covers are open.
Prior Art A device is known, wherein a gas-collecting cap contacts the crust at the crust opening. The purpose of this invention is to collect off-gases from the reduction cell in order to strip them of alumina fluorine compounds (patent US 4,770,752, 1988).
The drawbacks of the known device include limitations of said invention related to maintenance of the alumina feed system, located inside the cap, and possible damage during anode replacement since the cap is situated close to the anodes and crust.
A device is known, wherein a standard amount of process gases is removed between routine operations, and an increased amount of process gases is removed when opening the anode shell covers by activating an additional exhausting fan. A
separator wall is mounted inside the hooding to direct the streams upward into gas channels to reduce emissions into the potroom (patent RU 2251593 C2, 1PC C25C3/20, Publ. 11.15.2000).
The drawback of the analog device is that, upon unsealing the reduction cell, a stream of air drawn under the hooding displaces the electrolysis gases along the reduction cell and creates stagnant regions with elevated concentrations of electrolysis gases under the bottom flange of the collector beam. In these regions, the gases escape into the working zone of the potroom through the gaps between the anode rods and the flange, as well as through the gaps between hooding covers.
Date Recue/Date Received 2020-05-07 A device for collecting and removing gases from an aluminum reduction cell is known as disclosed in patent RU 2553137, C25C 3/22 Publ. 06.10.2015, comprising a collector beam with top and bottom stiffening rings and double vertical walls, between which, in the top part of the collector beam along the vertical walls, the main gas duct channels of the variable cross-section are formed with confusors located along the longitudinal axis of the collector beam above the anodes, with one end secured at the fairing inlet and the other end with openings at the bottom stiffening ring, with the height of the main gas duct channels increasing towards the end of the collector beam connected to the gas stripping system.
Two additional gas duct channels of the variable cross-section are located between the top and bottom stiffening rings symmetrically with respect to the longitudinal axis of the collector beam, which are connected to the bottom stiffening ring with confusors equipped with shutters and located along the longitudinal axis above the anodes between the confusors of the main gas duct channel, wherein each main gas duct channel has a confusor mounted at its front side in the metal extraction zone.
The drawback of the provided device is that a local increase of rarefaction in the zone of anode replacement is provided in the device without equalizing the rarefaction under the entire hooding. To this end, additional gas ducts are included, connected to confusors that are equipped with automatic shutters. Through the openings, with doors removed for anode replacement, a large volume of air is drawn under the hooding, with swirling streams forming and propagating under the entire hooding. As a result, confusors in other zones of the hooding cannot manage gas removal, and the gas escapes into the potroom through leaks in the hooding.
The provided device does not ensure efficient gas removal during anode replacement.
The closest invention to the claimed invention in terms of technical essence is a device for collecting hot off-gas emerging in the course of reduction disclosed in patent WO 2010/033037 Al, IPC C25C3/22, Publ. 03.25.2010, which has been selected as the prior art. In the device, the gas removal cap is located immediately above the crust opening and ensures a lower total volume of the gas removed from Date Recue/Date Received 2020-05-07 the reduction cell at a higher concentration of CO2 and elevated temperature, reducing the number of gas stripping units and increasing the heat exchange potential. In addition, the gas-collecting cap has at least two inlets, i. e.
it has double walls. The inlet speed between the double walls significantly exceeds the speed at the cap center, providing additional draft that creates an artificial air wall, ensuring more efficient collection of off-gases and reducing interference from transversal streams.
Drawbacks of the prior art device:
The prior art cap design ensures efficient removal of electrolysis gases by i0 the double walls, which create an artificial air wall and reduce interference from transversal streams. In this case, cap displacement away from the breakers will render gas removal inefficient, and during operation in aggressive environments, positioning the cap immediately above the crust opening will result in damage to the control mechanisms for the streams of the reduction cell reflector and feeder.
The desirable range of cap positioning above the crust, being 10-1,000 mm, is determined by the speed of alumina carry-over and the possibility of replacing the anodes. To meet this requirement, the cap mounting height should be changed for different operations, which disturbs the tightness of the device for removing gases.
Efficient gas removal from the reduction cell requires equal volumes of gas removal from all the caps positioned under the hooding of the reduction cell.
This requires equal rarefaction levels at each cap inlet; however, the prior art device has no system to control uniform gas intake under the hooding of the reduction cell.
In the device disclosed in WO 2010/033037, the cap for process gas collection may be mounted next to the feeder, rather than being an integral part of it. In this case, the bulk of the gases will be drawn at the cap periphery;
however, this requires uniform gas intake along the cap base length.
When replacing the anodes, the hooding doors are opened and air drawn through the resulting opening forms swirling streams that displace the gas into one end of the reduction cell such that the caps in that zone cannot manage removal of Date Recue/Date Received 2020-05-07 the increased gas volume. Furthermore, the air wall prevents drawing in the transversal streams of gas that evolves through large breaks formed in the electrolyte crust where the anodes are being removed.
Thus, the prior art device does not ensure efficient removal of electrolysis gases, both between routine operations of reduction cell operation and during routine operations. Furthermore, the equipment positioned under the hooding experiences high stresses from an aggressive environment.
Disclosure of the Invention The invention is intended to reduce heat losses with off-gases from the reduction cell and to relieve the stress on gas stripping units, while maintaining gas removal efficiency.
The stress on the gas stripping facilities is determined by the volume of gases removed from the reduction cells. The total volume of gases removed from a reduction cell with baked anodes is 3,000-20,000 nm3/h, of which only 1-2% are electrolysis gases, with the remainder being air. The efficiency of gas removal from a reduction cell is determined by the efficiency coefficient of the system of gas removal from the reduction cell. This value is usually 98%.
The technical result of the claimed invention is a several-fold reduction in the total volume of gases removed from a reduction cell due to decreased air volume, while ensuring the following conditions.
1. The efficiency coefficient of the gas removal system is maintained at 98% or higher, both between routine operations of reduction cell operation and during routine operations.
2. The stresses exerted by an aggressive environment on the equipment positioned under the hooding do not increase.
To ensure the -first condition, the provided technical solution maintains uniformity of gas intake along the reduction cell hooding length and along the length of each gas-collecting cap base between routine operations of reduction cell operation.
Date Recue/Date Received 2020-05-07 To ensure the second condition, the gas-collecting caps are positioned in such a manner that the mechanisms for feeding alumina are outside the gas intake zone, while the cap design ensures uniformity of gas intake along the length of each gas-collecting cap base for said positioning¨outside the gas intake zone.
In one of the embodiments, the posed problem is solved by a device for collecting and removing gases in an aluminum reduction cell, which comprises a system of gas ducts comprising horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts; and gas-collecting caps wherein each gas-collecting cap is connected by a first channel to a horizontal to main gas duct to form a main gas removal loop, and is connected by a second channel to an additional vertical gas duct to form an additional gas removal loop.
The height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas 15 stream by 24-26% of the height of the preceding second channel.
Separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap, with at least two separator plates mounted symmetrically at each side of the central axis of the gas-20 collecting cap, and the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%, According to one embodiment of the suggested invention, the caps are made in the form of confusors.
According to one embodiment of the suggested invention, the main and 25 additional loops are combined at the top part of the caps.
According to one embodiment of the suggested invention, the distance between the separator plates is at least 15% of the length of the gas-collecting cap base.
In addition, a system for collecting and removing gases in an aluminum 30 reduction cell is provided, which comprises a reduction cell comprising at least Date Recue/Date Received 2020-05-07 anodes and electrolyte crust breakers, a hooding of the reduction cell made of removable covers, a system of gas ducts, including horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts, and gas-collecting caps positioned under the hooding of the reduction cell along its longitudinal axis between the electrolyte crust breakers to form a gas intake zone at the center of the reduction cell. Guiding elements are mounted at the internal side of the removable hooding covers horizontally with respect to the electrolyte crust, which are configured to guide gas streams into the gas intake zone, wherein each of the gas-collecting caps is connected by a first channel to a horizontal main gas I() duct to form a main gas removal loop, and by a second channel to an additional vertical gas duct to -am an additional gas removal loop. The height of each subsequent first channel of the main loop is increased along the gas stream by 24% of the height of the preceding first channel, and the height of each subsequent.
second channel of the additional loop is increased along the gas stream by 24-26%
of the height of the preceding second channel. Separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap. At least two separator plates are mounted symmetrically on each side of the central axis of the gas-collecting cap, 2() with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
According to one embodiment of the suggested invention, the gas-collecting caps in the system are positioned above the electrolyte crust at a distance equal to 0.5-1.5 of the height of a new anode of the reduction cell.
According to one embodiment of the suggested invention, the height of the hooding with respect to the electrolyte level is equal to 1,5-2 of the height of a new anode.
Also, a reduction cell is provided, which includes the device for collecting and removing gases in an aluminum reduction cell described above.
Date Recue/Date Received 2020-05-07 The listed embodiments of the present invention are not the only possible ones. Various modifications and improvements are envisioned without departing from the scope of the invention as defined by the independent claims.
Brief Description of the Draivings The inventive essence is illustrated by the following drawings.
Fig. I shows a general view of the reduction cell that includes the device for collecting and removing gases.
Fig. 2 shows the arrangement of elements of the structure for collecting and removing gases inside the reduction cell.
Fig. 3 shows the elements of the main and additional gas removal loops.
Fig. 4 shows an embodiment of the guiding element of the device for collecting and removing gases made in the form of a projection (cross-sectional view of the reduction cell).
Fig. 5 shows an embodiment of the guiding element of the device for collecting and removing gases made in the form of plates (cross-sectional view of the reduction cell).
Fig. 6 shows the arrangement of the separator plates in the gas-collecting cap (cross-sectional view of the cap).
Fig. 7 shows a longitudinal view of the main and additional gas removal loops with gas-collecting caps.
Embodiments of the Invention The device for collecting and removing gases is mounted in a reduction cell.
A reduction cell is a device for producing aluminum by reduction of melts, typically comprising anodes, point alumina feeders with breakers, a collector beam with gas ducts and gas-collecting caps, and a hooding. All structural elements of the claimed device are secured on the collector beam (1). The hooding of the reduction cell (2) is made of separate covers with guiding elements 3 rigidly mounted on their internal side horizontally with respect to the electrolyte crust of the melt. The guiding elements may be structurally made in the form of plates or projections (Fig. 4 and Fig. 5) made of materials used to manufacture the hooding Date Recue/Date Received 2020-05-07 covers, such as aluminum. The number of guiding elements is determined by the speed of streams between the guides, and must ensure air stream speed higher than 2 m/s and lower than 7 m/s to exclude gas escape from the reduction cell and alumina carry-over from the crust surface. The position and length of the guiding elements are determined by the hooding configuration and provision of uniform flow around the anodes.
The gas-collecting caps (4) are positioned under the hooding of the reduction cell along its longitudinal axis between the electrolyte crust breakers above the anodes (5) and between the breakers (6) to form a gas intake zone at the center of the reduction cell.
Each gas-collecting cap (4) is connected by a first channel (8) to a horizontal main gas duct (9) to form a main gas removal loop, and is connected by a second channel (8') to an additional vertical gas duct (10) to form an additional gas removal loop (Fig. 3). The height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas stream by 24-26% of the height of the preceding second channel. The main (9) and additional (10) horizontal gas ducts are connected to the potroom system of gas removal (not shown).
Separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap (Fig. 7). The separator plates are rigidly secured at each side of the central axis of the gas-collecting cap, with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
The plates are positioned symmetrically with respect to the central axis of the cap, ensuring equal conditions for gas intake along the cap base length. The number of plates must be at least two at each side of the central axis to exclude stagnant zones in the cap. The separator plates mounted in such a way divide the cap volume into sectors (channels) with equal speeds at the cap base, not forming stagnant zones Date Recue/Date Received 2020-05-07 through which gas is not removed, ensuring equal efficiency of gas intake at the cap center and periphery. The width of each parallel channel should preferably be at least 15% of the cap base length. The obtained effect allows the caps to be positioned between the breakers, whilst the mechanisms for -feeding alumina are outside the gas intake zone and the stress from an aggressive environment thereupon is minimal.
The inventors unexpectedly -found that for different plate position and dimensions, the effect of the uniform gas intake at the cap base is not obtained.
Thus, an increase in plate length or directing the plates towards the cap center resulted in collision of streams from individual channels and therefore the formation of positive pressure zones. In this case, the gas escaped back into the hooding. Positioning the plates at the cap top resulted in increased speeds upon exiting the cap. As a consequence, the gas-dynamic resistance of the cap increased, and thus the stress on the gas-stripping resistance increased as well. The non-uniformity of gas intake at the cap base also increased, as in this case, zones with different degrees of rarefaction are fOrmed at the cap inlet. Furthermore, air walls similar to air walls in the prior art device may form, preventing gas intake at the cap periphery.
The gas-collecting caps (4) are mounted above the electrolyte crust, for example, at a distance equal to 0.5-1.5 of the height of a new anode, and the height of the hooding is equal to 1.5-2.0 of the height of a new anode. An increase in hooding height will increase the volume of air in the removed gases, the gas removal will require an increase in rarefaction to levels present in the current designs of reduction cells, with increased stress on the gas-stripping facilities as well as increased heat losses. In case of a decrease in volume, anode replacement will become impossible.
In one of the embodiments designed in the course of developing the invention, the gas-collecting cap was made in the form of a confusor--a device wherein the channel gradually tapers, which increases the speed of the gases being removed and reduces losses of energy spent on gas removal. The cap height was Date Recue/Date Received 2020-05-07 800 mm, and the base length was 1,800 mm at a base width of 170 mm. The separator plates were secured at a height of 30 mm from the cap base and were directed along the side walls, forming parallel channels for the gas flow. The length of the first plate was 400 mm, which is 50% of the cap height. The lengths of the second and third plates were 260 mm and 170 mm, respectively. The rectangular shape of the cap base was defined by the need to perform anode replacement and position mechanisms for feeding alumina under the hooding, with the caps covering the entire space in the reduction cell center between the anodes, excluding the space fbr operating the breakers and feeders. The width of each of i0 the parallel channels was 180 mm. The caps were mounted at a height of 50 mm above the anodes, The device operates as follows. Between routine operations of reduction cell operation, the gas coming under the hooding of the reduction cell (2) through crust openings punctured by the breakers (6) mixes with air coming through the hooding 1 5 leaks, and is drawn into the caps (4) of the main horizontal gas duct (9) for gas removal and further proceeds to the potroom gas removal system (not shown).
The separator plates (7) in the caps (4) uniformly distribute the gas stream over the cap base. The uniformity of gas streams distribution among the caps (4) is ensured by distributing the resistance along the length of the main horizontal gas duct (9) by 20 varying the heights of channels (8) and (8') to the main gas duct. The caps (4) are preferably positioned above the crust at a height of 0.5-1.5 of the anode (5) height, between the breakers (6), ensuring a degree of rarefaction sufficient for complete gas removal.
When performing operations with the reduction cell involving partial 25 unsealing of the reduction cell, air is drawn under the hooding (2) and mixes with.
anode gases to form vertical and horizontal swirling streams. The guiding elements (3) secured to the internal side of the hooding covers break down the swirling streams and direct them to the caps (4). When performing operations (such as anode replacement), the gas is simultaneously removed through the 30 main (9) and additional (10) gas ducts. Thus, the degree of rarefaction under the Date Recue/Date Received 2020-05-07 hooding can be increased by a factor of 3-4, which is sufficient for gas removal upon partial unsealing of the hooding. Known mechanisms, such as dampers, cut the main and additional gas ducts in and out.
Implementing the claimed device decreases the volume of gases removed from one reduction cell by a factor of 2-4 due to the combined effect of reducing the volume of gases to be removed, redistributing gas streams into the gas intake zone, and positioning the caps close to the location of electrolysis gas evolution under the hooding. The obtained efficiency coefficient of gas removal is 98%-99%, depending on operations performed with the reduction cell.
Mounting the caps under the hoodin2, close to the location of electrolysis gas evolution, increases gas removal efficiency at a lower volume of removed gas, and said height of cap mounting above the electrolyte crust ensures the possibility of anode replacement without damaging the caps. The plates inside the caps ensure uniform gas intake along the cap base length.
The caps are simultaneously included in the main and additional gas removal system, ensuring efficient gas removal, both between routine operations and during routine operations.
Said range of variation of the height of channels connecting to the caps ensures efficient operation of all the caps, i. e. efficient gas removal along the length of the reduction cell.
The main and additional gas ducts connect to the caps at the top part of the caps (at the con fusor vertex). The speed of the streams at the exit from confusors has already been equalized, and cutting in an additional loop will not change the character of gas flow inside the confusor, i. e. will have no effect on the uniformity of gas intake at the cap base. The gas redistributes over the loops proportionally to the rarefaction in the loops and the gas duct cross-sectional area.
Cap positioning between the breakers at a height equal to 0.5-1.5 of the anode height allows the anodes to be replaced without damaging the structural elements of the device for removing gases and decreases the effect of temperatures II
Date Recue/Date Received 2020-05-07 and abrasive particles on the normal operation of breakers and feeders of the reduction cell.
Date Recue/Date Received 2020-05-07
To ensure the -first condition, the provided technical solution maintains uniformity of gas intake along the reduction cell hooding length and along the length of each gas-collecting cap base between routine operations of reduction cell operation.
Date Recue/Date Received 2020-05-07 To ensure the second condition, the gas-collecting caps are positioned in such a manner that the mechanisms for feeding alumina are outside the gas intake zone, while the cap design ensures uniformity of gas intake along the length of each gas-collecting cap base for said positioning¨outside the gas intake zone.
In one of the embodiments, the posed problem is solved by a device for collecting and removing gases in an aluminum reduction cell, which comprises a system of gas ducts comprising horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts; and gas-collecting caps wherein each gas-collecting cap is connected by a first channel to a horizontal to main gas duct to form a main gas removal loop, and is connected by a second channel to an additional vertical gas duct to form an additional gas removal loop.
The height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas 15 stream by 24-26% of the height of the preceding second channel.
Separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap, with at least two separator plates mounted symmetrically at each side of the central axis of the gas-20 collecting cap, and the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%, According to one embodiment of the suggested invention, the caps are made in the form of confusors.
According to one embodiment of the suggested invention, the main and 25 additional loops are combined at the top part of the caps.
According to one embodiment of the suggested invention, the distance between the separator plates is at least 15% of the length of the gas-collecting cap base.
In addition, a system for collecting and removing gases in an aluminum 30 reduction cell is provided, which comprises a reduction cell comprising at least Date Recue/Date Received 2020-05-07 anodes and electrolyte crust breakers, a hooding of the reduction cell made of removable covers, a system of gas ducts, including horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts, and gas-collecting caps positioned under the hooding of the reduction cell along its longitudinal axis between the electrolyte crust breakers to form a gas intake zone at the center of the reduction cell. Guiding elements are mounted at the internal side of the removable hooding covers horizontally with respect to the electrolyte crust, which are configured to guide gas streams into the gas intake zone, wherein each of the gas-collecting caps is connected by a first channel to a horizontal main gas I() duct to form a main gas removal loop, and by a second channel to an additional vertical gas duct to -am an additional gas removal loop. The height of each subsequent first channel of the main loop is increased along the gas stream by 24% of the height of the preceding first channel, and the height of each subsequent.
second channel of the additional loop is increased along the gas stream by 24-26%
of the height of the preceding second channel. Separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap. At least two separator plates are mounted symmetrically on each side of the central axis of the gas-collecting cap, 2() with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
According to one embodiment of the suggested invention, the gas-collecting caps in the system are positioned above the electrolyte crust at a distance equal to 0.5-1.5 of the height of a new anode of the reduction cell.
According to one embodiment of the suggested invention, the height of the hooding with respect to the electrolyte level is equal to 1,5-2 of the height of a new anode.
Also, a reduction cell is provided, which includes the device for collecting and removing gases in an aluminum reduction cell described above.
Date Recue/Date Received 2020-05-07 The listed embodiments of the present invention are not the only possible ones. Various modifications and improvements are envisioned without departing from the scope of the invention as defined by the independent claims.
Brief Description of the Draivings The inventive essence is illustrated by the following drawings.
Fig. I shows a general view of the reduction cell that includes the device for collecting and removing gases.
Fig. 2 shows the arrangement of elements of the structure for collecting and removing gases inside the reduction cell.
Fig. 3 shows the elements of the main and additional gas removal loops.
Fig. 4 shows an embodiment of the guiding element of the device for collecting and removing gases made in the form of a projection (cross-sectional view of the reduction cell).
Fig. 5 shows an embodiment of the guiding element of the device for collecting and removing gases made in the form of plates (cross-sectional view of the reduction cell).
Fig. 6 shows the arrangement of the separator plates in the gas-collecting cap (cross-sectional view of the cap).
Fig. 7 shows a longitudinal view of the main and additional gas removal loops with gas-collecting caps.
Embodiments of the Invention The device for collecting and removing gases is mounted in a reduction cell.
A reduction cell is a device for producing aluminum by reduction of melts, typically comprising anodes, point alumina feeders with breakers, a collector beam with gas ducts and gas-collecting caps, and a hooding. All structural elements of the claimed device are secured on the collector beam (1). The hooding of the reduction cell (2) is made of separate covers with guiding elements 3 rigidly mounted on their internal side horizontally with respect to the electrolyte crust of the melt. The guiding elements may be structurally made in the form of plates or projections (Fig. 4 and Fig. 5) made of materials used to manufacture the hooding Date Recue/Date Received 2020-05-07 covers, such as aluminum. The number of guiding elements is determined by the speed of streams between the guides, and must ensure air stream speed higher than 2 m/s and lower than 7 m/s to exclude gas escape from the reduction cell and alumina carry-over from the crust surface. The position and length of the guiding elements are determined by the hooding configuration and provision of uniform flow around the anodes.
The gas-collecting caps (4) are positioned under the hooding of the reduction cell along its longitudinal axis between the electrolyte crust breakers above the anodes (5) and between the breakers (6) to form a gas intake zone at the center of the reduction cell.
Each gas-collecting cap (4) is connected by a first channel (8) to a horizontal main gas duct (9) to form a main gas removal loop, and is connected by a second channel (8') to an additional vertical gas duct (10) to form an additional gas removal loop (Fig. 3). The height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas stream by 24-26% of the height of the preceding second channel. The main (9) and additional (10) horizontal gas ducts are connected to the potroom system of gas removal (not shown).
Separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap (Fig. 7). The separator plates are rigidly secured at each side of the central axis of the gas-collecting cap, with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
The plates are positioned symmetrically with respect to the central axis of the cap, ensuring equal conditions for gas intake along the cap base length. The number of plates must be at least two at each side of the central axis to exclude stagnant zones in the cap. The separator plates mounted in such a way divide the cap volume into sectors (channels) with equal speeds at the cap base, not forming stagnant zones Date Recue/Date Received 2020-05-07 through which gas is not removed, ensuring equal efficiency of gas intake at the cap center and periphery. The width of each parallel channel should preferably be at least 15% of the cap base length. The obtained effect allows the caps to be positioned between the breakers, whilst the mechanisms for -feeding alumina are outside the gas intake zone and the stress from an aggressive environment thereupon is minimal.
The inventors unexpectedly -found that for different plate position and dimensions, the effect of the uniform gas intake at the cap base is not obtained.
Thus, an increase in plate length or directing the plates towards the cap center resulted in collision of streams from individual channels and therefore the formation of positive pressure zones. In this case, the gas escaped back into the hooding. Positioning the plates at the cap top resulted in increased speeds upon exiting the cap. As a consequence, the gas-dynamic resistance of the cap increased, and thus the stress on the gas-stripping resistance increased as well. The non-uniformity of gas intake at the cap base also increased, as in this case, zones with different degrees of rarefaction are fOrmed at the cap inlet. Furthermore, air walls similar to air walls in the prior art device may form, preventing gas intake at the cap periphery.
The gas-collecting caps (4) are mounted above the electrolyte crust, for example, at a distance equal to 0.5-1.5 of the height of a new anode, and the height of the hooding is equal to 1.5-2.0 of the height of a new anode. An increase in hooding height will increase the volume of air in the removed gases, the gas removal will require an increase in rarefaction to levels present in the current designs of reduction cells, with increased stress on the gas-stripping facilities as well as increased heat losses. In case of a decrease in volume, anode replacement will become impossible.
In one of the embodiments designed in the course of developing the invention, the gas-collecting cap was made in the form of a confusor--a device wherein the channel gradually tapers, which increases the speed of the gases being removed and reduces losses of energy spent on gas removal. The cap height was Date Recue/Date Received 2020-05-07 800 mm, and the base length was 1,800 mm at a base width of 170 mm. The separator plates were secured at a height of 30 mm from the cap base and were directed along the side walls, forming parallel channels for the gas flow. The length of the first plate was 400 mm, which is 50% of the cap height. The lengths of the second and third plates were 260 mm and 170 mm, respectively. The rectangular shape of the cap base was defined by the need to perform anode replacement and position mechanisms for feeding alumina under the hooding, with the caps covering the entire space in the reduction cell center between the anodes, excluding the space fbr operating the breakers and feeders. The width of each of i0 the parallel channels was 180 mm. The caps were mounted at a height of 50 mm above the anodes, The device operates as follows. Between routine operations of reduction cell operation, the gas coming under the hooding of the reduction cell (2) through crust openings punctured by the breakers (6) mixes with air coming through the hooding 1 5 leaks, and is drawn into the caps (4) of the main horizontal gas duct (9) for gas removal and further proceeds to the potroom gas removal system (not shown).
The separator plates (7) in the caps (4) uniformly distribute the gas stream over the cap base. The uniformity of gas streams distribution among the caps (4) is ensured by distributing the resistance along the length of the main horizontal gas duct (9) by 20 varying the heights of channels (8) and (8') to the main gas duct. The caps (4) are preferably positioned above the crust at a height of 0.5-1.5 of the anode (5) height, between the breakers (6), ensuring a degree of rarefaction sufficient for complete gas removal.
When performing operations with the reduction cell involving partial 25 unsealing of the reduction cell, air is drawn under the hooding (2) and mixes with.
anode gases to form vertical and horizontal swirling streams. The guiding elements (3) secured to the internal side of the hooding covers break down the swirling streams and direct them to the caps (4). When performing operations (such as anode replacement), the gas is simultaneously removed through the 30 main (9) and additional (10) gas ducts. Thus, the degree of rarefaction under the Date Recue/Date Received 2020-05-07 hooding can be increased by a factor of 3-4, which is sufficient for gas removal upon partial unsealing of the hooding. Known mechanisms, such as dampers, cut the main and additional gas ducts in and out.
Implementing the claimed device decreases the volume of gases removed from one reduction cell by a factor of 2-4 due to the combined effect of reducing the volume of gases to be removed, redistributing gas streams into the gas intake zone, and positioning the caps close to the location of electrolysis gas evolution under the hooding. The obtained efficiency coefficient of gas removal is 98%-99%, depending on operations performed with the reduction cell.
Mounting the caps under the hoodin2, close to the location of electrolysis gas evolution, increases gas removal efficiency at a lower volume of removed gas, and said height of cap mounting above the electrolyte crust ensures the possibility of anode replacement without damaging the caps. The plates inside the caps ensure uniform gas intake along the cap base length.
The caps are simultaneously included in the main and additional gas removal system, ensuring efficient gas removal, both between routine operations and during routine operations.
Said range of variation of the height of channels connecting to the caps ensures efficient operation of all the caps, i. e. efficient gas removal along the length of the reduction cell.
The main and additional gas ducts connect to the caps at the top part of the caps (at the con fusor vertex). The speed of the streams at the exit from confusors has already been equalized, and cutting in an additional loop will not change the character of gas flow inside the confusor, i. e. will have no effect on the uniformity of gas intake at the cap base. The gas redistributes over the loops proportionally to the rarefaction in the loops and the gas duct cross-sectional area.
Cap positioning between the breakers at a height equal to 0.5-1.5 of the anode height allows the anodes to be replaced without damaging the structural elements of the device for removing gases and decreases the effect of temperatures II
Date Recue/Date Received 2020-05-07 and abrasive particles on the normal operation of breakers and feeders of the reduction cell.
Date Recue/Date Received 2020-05-07
Claims (11)
1. A device for collecting and removing gases in an aluminum reduction cell comprising:
a system of gas ducts comprising horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts; and 2as-collecting caps;
wherein each of the gas-collecting caps is connected by a first channel to a horizontal main gas duct to form a main gas removal loop, and is connected by a second channel to an additional vertical gas duct to form an additional gas removal loop; wherein the height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas stream by 24-26% of the height of the preceding second channel;
wherein separator plates are mounted at the bottom part On the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap;
wherein at least two separator plates are mounted symmetrically on each side of the central axis of the gas-collecting cap, with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
a system of gas ducts comprising horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts; and 2as-collecting caps;
wherein each of the gas-collecting caps is connected by a first channel to a horizontal main gas duct to form a main gas removal loop, and is connected by a second channel to an additional vertical gas duct to form an additional gas removal loop; wherein the height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas stream by 24-26% of the height of the preceding second channel;
wherein separator plates are mounted at the bottom part On the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap;
wherein at least two separator plates are mounted symmetrically on each side of the central axis of the gas-collecting cap, with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
2. The device of claim 1, characterized in that the main and additional loops are combined at the top part of the caps.
3. The device of claim 1, characterized in that the caps are made in the form of confusors.
4. The device of claim 1, characterized in that the distance between the separator plates is at least 15% of the length of the gas-collecting cap base.
5. A system for collecting and removing gases in an aluminum reduction cell, comprising:
a reduction cell comprising at least anodes and electrolyte crust breakers, a hooding of the reduction cell made of removable covers;
a system of gas ducts including horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts;
gas-collecting caps positioned under the hooding of the reduction cell along its longitudinal axis between the electrolyte crust breakers to form a gas intake zone at the center of the reduction cell;
wherein guiding elements are mounted on the internal side of the removable hooding covers horizontally with respect to the electrolyte crust, configured to guide gas streams into the gas intake zone;
wherein each of the gas-collecting caps is connected by a first channel to a horizontal main gas duct to form a main gas removal loop, and is connected by a second channel to an additional vertical gas duct to form an additional gas removal loop; wherein the height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas stream by 24-26% of the height of the preceding second channel;
wherein separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap;
wherein at least two separator plates are mounted symmetrically on each side of the central axis of the gas-collecting cap, with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
a reduction cell comprising at least anodes and electrolyte crust breakers, a hooding of the reduction cell made of removable covers;
a system of gas ducts including horizontal main and additional gas ducts configured to cut in/out the main and additional gas ducts;
gas-collecting caps positioned under the hooding of the reduction cell along its longitudinal axis between the electrolyte crust breakers to form a gas intake zone at the center of the reduction cell;
wherein guiding elements are mounted on the internal side of the removable hooding covers horizontally with respect to the electrolyte crust, configured to guide gas streams into the gas intake zone;
wherein each of the gas-collecting caps is connected by a first channel to a horizontal main gas duct to form a main gas removal loop, and is connected by a second channel to an additional vertical gas duct to form an additional gas removal loop; wherein the height of each subsequent first channel of the main loop is increased along the gas stream by 16-24% of the height of the preceding first channel, and the height of each subsequent second channel of the additional loop is increased along the gas stream by 24-26% of the height of the preceding second channel;
wherein separator plates are mounted at the bottom part on the internal surface of the longitudinal sides of at least one gas-collecting cap along the direction of the gas flow, having a length of not more than 50% of the height of the gas-collecting cap;
wherein at least two separator plates are mounted symmetrically on each side of the central axis of the gas-collecting cap, with the length of each subsequent plate in the direction of the central axis of the cap decreasing with respect to the preceding one by 25-35%.
6. The system of claim 5, characterized in that the caps are made in the form of confusors.
7. The system of claim 5, characterized in that the 2as-collecting caps are positioned above the electrolyte crust at a distance equal to 0.5-1.5 of the height of a new anode.
8. The system of claim 5, characterized in that the height of the hooding with respect to the level of the electrolyte is equal to 1.5-2 of the height of a new anode.
9. The system of claim 5, characterized in that the main and additional loops are combined at the top part of the caps.
10. The system of claim 5, characterized in that the distance between the separator plates is at least 15% of the length of the gas-collecting cap base.
11. A reduction cell comprising the device for collecting and removing gases of claim 1.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2017140384A RU2668617C1 (en) | 2017-11-20 | 2017-11-20 | Device for collection and removal of gases in aluminium electrolysis cell |
| RU2017140384 | 2017-11-20 | ||
| PCT/RU2018/050084 WO2019098888A1 (en) | 2017-11-20 | 2018-07-26 | Device for collecting and removing gases in an aluminum electrolysis cell |
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| CA3082087A1 true CA3082087A1 (en) | 2019-05-23 |
| CA3082087C CA3082087C (en) | 2021-11-09 |
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| CA3082087A Active CA3082087C (en) | 2017-11-20 | 2018-07-26 | Device for collecting and removing gases in an aluminum reduction cell |
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| CN (1) | CN111356788B (en) |
| CA (1) | CA3082087C (en) |
| NO (1) | NO20200539A1 (en) |
| RU (1) | RU2668617C1 (en) |
| WO (1) | WO2019098888A1 (en) |
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| NO20190343A1 (en) * | 2019-03-14 | 2020-09-15 | Norsk Hydro As | Arrangement for collection of hot gas from an electrolysis process, and a method for such gas collection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS57174483A (en) * | 1981-04-17 | 1982-10-27 | Sumitomo Light Metal Ind Ltd | Method and device for continuous measurement of current efficiency of aluminum electrolyzing cell |
| SU1025756A1 (en) * | 1981-11-26 | 1983-06-30 | Всесоюзный Научно-Исследовательский И Проектный Институт Алюминиевой,Магниевой И Электродной Промышленности | Apparatus for catching gases released in producing aluminium by electrolysis |
| FR2806742B1 (en) * | 2000-03-24 | 2002-05-03 | Pechiney Aluminium | INSTALLATION OF FACILITIES OF AN ELECTROLYSIS PLANT FOR THE PRODUCTION OF ALUMINUM |
| NO314469B1 (en) * | 2001-06-25 | 2003-03-24 | Alstom Technology Ltd | Method and apparatus for gas transport |
| GB0705439D0 (en) * | 2007-03-22 | 2007-05-02 | Alstom Intellectual Property | Improved flue gas cooling and cleaning arrangment |
| NO332375B1 (en) * | 2008-09-19 | 2012-09-10 | Norsk Hydro As | Spot feeder with integrated exhaust collection as well as a method for exhaust collection |
| CN201485516U (en) * | 2009-08-10 | 2010-05-26 | 山东滨州渤海活塞股份有限公司 | Double-channel alloy aluminum electrolysis flue gas purifying dust collector |
| CN201793776U (en) * | 2010-06-29 | 2011-04-13 | 沈阳铝镁设计研究院 | Gas collecting pipeline system with aluminum cell and double smoke pipes |
| CN102312253A (en) * | 2010-06-29 | 2012-01-11 | 沈阳铝镁设计研究院有限公司 | Double-flue pipe gas-collecting pipeline system of aluminum electrolytic tank and control method |
| RU2468127C1 (en) * | 2011-05-10 | 2012-11-27 | Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Сибирский Федеральный Университет" | Device for collection and evacuation of anode gases from under electrolytic cell shelter with annealed anodes |
| CN102995064A (en) * | 2012-12-24 | 2013-03-27 | 云南云铝涌鑫铝业有限公司 | Collecting device of smoke in electrolysis |
| RU2553137C1 (en) * | 2014-01-23 | 2015-06-10 | Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" | Device for gases collecting and removing from aluminium electrolyser |
| CN106149007A (en) * | 2015-04-22 | 2016-11-23 | 沈阳铝镁科技有限公司 | Aluminum electrolyzing cell used multistage stand alone type gas collection lower flue structure |
| RU2603524C1 (en) * | 2015-06-15 | 2016-11-27 | Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" | Device for collection and removal of gases from aluminium electrolysis cell |
| CN105154921B (en) * | 2015-09-30 | 2017-10-10 | 东北大学设计研究院（有限公司） | A kind of electrolytic cell flue deashing device and ash removal method |
-
2017
- 2017-11-20 RU RU2017140384A patent/RU2668617C1/en active
-
2018
- 2018-07-26 WO PCT/RU2018/050084 patent/WO2019098888A1/en active Application Filing
- 2018-07-26 CN CN201880074515.2A patent/CN111356788B/en active Active
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| NO20200539A1 (en) | 2020-05-08 |
| CN111356788A (en) | 2020-06-30 |
| CA3082087C (en) | 2021-11-09 |
| WO2019098888A1 (en) | 2019-05-23 |
| RU2668617C1 (en) | 2018-10-02 |
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