CN107653462B - Asphalt smoke gas collection treatment method and device in roasting process of aluminum electrolysis cell - Google Patents
Asphalt smoke gas collection treatment method and device in roasting process of aluminum electrolysis cell Download PDFInfo
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- CN107653462B CN107653462B CN201711025380.4A CN201711025380A CN107653462B CN 107653462 B CN107653462 B CN 107653462B CN 201711025380 A CN201711025380 A CN 201711025380A CN 107653462 B CN107653462 B CN 107653462B
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- 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
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Abstract
The invention discloses a method and a device for treating asphalt fume collection in the roasting process of an aluminum electrolysis cell, wherein a cell cavity asphalt fume collection system is arranged at the upper part of a cell cavity of the aluminum electrolysis cell during the roasting process of a pre-baked aluminum electrolysis cell so as to collect tar-containing asphalt fume discharged from the inside of the cell during the roasting process of the aluminum electrolysis cell; two groups of tank-side cathode steel bar asphalt fume collecting systems are respectively arranged at two sides of the side part of the aluminum electrolysis tank so as to collect tar-containing asphalt fume discharged by the tank-side cathode steel bar window during the roasting of the aluminum electrolysis tank; an asphalt fume collecting and treating system is arranged at the flue end of the aluminum electrolysis cell to collect all tar-containing asphalt fume discharged by the electrolysis cell during the roasting of the aluminum electrolysis cell, and asphalt tar is effectively filtered by a replaceable wire mesh demister arranged on a collecting pipeline; the filtered tar is discharged from the asphalt tar discharge pipe. The above proposal ensures that the exhaust tail gas entering the electrolytic purification system in the roasting process reaches the emission standard, and does not cause secondary pollution to the pipeline and equipment of the purification system.
Description
Technical Field
The invention relates to a flue gas treatment method in the technical field of aluminum electrolysis, in particular to a method and a device for treating asphalt flue gas collection in the roasting process of an aluminum electrolysis cell.
Background
The aluminum cell is main equipment for aluminum smelting, and the roasting starting process is a production stage which is required to be carried out when the aluminum cell is put into normal operation.
In the traditional aluminum electrolysis cell roasting process, as the cathode is fixed with a certain amount of carbon paste during lining furnace construction, the carbon paste mainly consists of a plurality of components such as electrically calcined anthracite (or a part of tragic graphite is crushed), coal pitch and coal tar, during the roasting process of the aluminum electrolysis cell, asphalt components in the cathode lining of the electrolytic cell volatilize and overflow along with the period that the roasting temperature is increased to 300-500 ℃, so that harmful asphalt smoke and tar with a certain pollution effect are formed, the environment pollution of workshops is caused, and even serious adverse effects such as smoke exhaust pipeline fouling of the electrolysis workshop, filter cloth bag blockage of a purifying system and the like are caused, and the normal operation of an electrolysis series is further influenced.
At present, the statistics of the components and pollutant discharge amounts of cathode tamping paste for aluminum electrolysis cells at home and abroad are as follows:
in general, the average fixing amount of the pre-baked aluminum electrolysis cell cathode tamping paste is 4-6 tons/table, and according to the test of the table, the discharge amount of pollutants which can be generated in the baking process of the aluminum electrolysis cell is as follows:
asphalt smoke volatilization amount: 4000-6000 x 5% x7.5% =15-22.5 kg;
tar volatilization amount: 4000-6000 x 13% x7.5% =39-58.5 kg;
while during roasting, the single cell cathode exhaust of the aluminum electrolysis cell is about 750m 3 The emission concentration of the asphalt fume is: 15-22.5 kg/750m 3 ＝0.200～0.0300kg/m 3 ＝20000～30000mg/m 3 ＞＞20mg/m 3 ("emission standards for pollutants in the aluminium industry" GB 25465-2010).
It can be seen that the concentration of asphalt fume discharged during the roasting of the aluminum electrolysis cell is up to 1000-1500 times of the national discharge standard allowance, so that effective treatment measures must be taken to treat pollutants during the roasting of the aluminum electrolysis cell.
Disclosure of Invention
The invention aims to provide a method and a device for treating asphalt fume collection in the roasting process of an aluminum electrolysis cell, which are used for solving the defects in the prior art:
the technical scheme of the invention is as follows:
the invention firstly provides a method for treating asphalt fume collection gas in the roasting process of an aluminum electrolysis cell, which is characterized in that a cell cavity asphalt fume collection system is arranged at the upper part of a cell cavity of the aluminum electrolysis cell during the roasting process of a prebaked aluminum electrolysis cell so as to collect tar-containing asphalt fume discharged from the inside of the cell during the roasting process of the aluminum electrolysis cell; two groups of tank-side cathode steel bar asphalt fume collecting systems are respectively arranged at two sides of the side part of the aluminum electrolysis tank so as to collect tar-containing asphalt fume discharged by the tank-side cathode steel bar window during the roasting of the aluminum electrolysis tank; an asphalt fume collecting and treating system is arranged at the flue end of the aluminum electrolysis cell to collect all tar-containing asphalt fume discharged by the electrolysis cell during the roasting of the aluminum electrolysis cell, and asphalt tar is effectively filtered by a replaceable wire mesh demister arranged on a collecting pipeline; the filtered tar is discharged from the asphalt tar discharge pipe.
The invention also provides an asphalt fume collecting and treating device for the roasting process of the aluminum electrolysis cell, which comprises a cell chamber asphalt fume collecting system, a cell side cathode steel bar asphalt fume collecting system and an asphalt fume collecting and treating system; the groove chamber asphalt fume collecting system comprises a groove chamber asphalt fume collecting pipe, a groove chamber fume collecting hood and a groove chamber fume collecting pipe regulating valve; the groove-side cathode steel bar asphalt fume collecting system comprises a groove-side cathode steel bar fume collecting reducer pipe, a cathode steel bar fume collecting hood and a groove-side fume collecting pipe regulating valve; the asphalt smoke collecting and treating system comprises an asphalt smoke collecting and treating pipe, a wire mesh demister, an asphalt tar discharging pipe and a supporting bracket thereof; and the bore asphalt fume collecting pipe and the groove side cathode steel rod gas collecting reducer pipe are connected with an asphalt fume collecting pipe at the tail end.
Wherein, the tank chamber pitch fume gas collecting pipe is arranged at the upper part of the electrolytic tank chamber, adopts a two-stage reducing structure, and the first-stage pipe diameter range is within
The second diode diameter is in the range of +.>
Between them; the groove chamber fume collecting hood is arranged at the lower part of the groove chamber asphalt fume collecting pipe, and the number of the groove chamber fume collecting hoods is 2-5; and the groove chamber gas collection pipe regulating valve is arranged at the connecting part of the tail end of the second-stage reducing pipeline of the groove chamber asphalt gas collection pipe and the asphalt gas collection pipe.
Further, the number of the cathode steel bar gas collection reducing pipes at the side of the electrolytic tank is two, and the cathode steel bar gas collection reducing pipes are respectively arranged at two sides of the electrolytic tank; the groove side cathode steel bar gas collection reducing pipe also adopts a two-stage reducing structure, and the diameter range of the first stage pipe diameter is within
The second diode diameter is in the range of +.>
Between them; the groove side gas collecting pipe regulating valve is arranged at the connecting part of the tail end of the groove side cathode steel bar gas collecting reducer pipe and the asphalt fume collecting pipe.
Further, the lower part of the cell side cathode steel bar gas collection reducing pipe is connected with more than two groups of cathode steel bar gas collection covers which are matched with cathode steel bar groups on the cell shell of the aluminum electrolysis cell, and each group of cathode steel bars is provided with one cathode steel bar gas collection cover.
Further, the asphalt fume collecting pipe is arranged at the flue end of the aluminum electrolysis cell, and the pipe diameter range is as follows
The front end of the device adopts a cone reducing structure, and an asphalt tar discharging pipe is arranged at the reducing part of the device.
Further, the asphalt fume collecting pipe is connected with the fume exhaust pipe of the electrolytic purification system, and a wire mesh demister is arranged at the connecting part, wherein the number of the wire mesh layers is 3-5, the number of the wire mesh is 9-3000, and the wire mesh is used for filtering tar particles with the particle size of 3-35 mu m.
The method and the device for collecting and treating the asphalt smoke (containing tar) during the roasting of the prebaked aluminum electrolysis cell can collect the asphalt smoke discharged by the cathode in the cell and the asphalt smoke discharged by the cathode steel bar window at the side part of the cell in the roasting process of the aluminum electrolysis cell, and can filter tar pollutants rapidly in a gathering way, so that the exhaust tail gas entering the electrolytic purification system during the roasting process reaches the exhaust standard, and no secondary pollution is caused to the pipeline and equipment of the purification system.
Drawings
FIG. 1 is a schematic diagram of the apparatus structure of the asphalt fume collection treatment method in the roasting process of the aluminum electrolysis cell of the invention;
fig. 2 is a sectional view taken along the direction a in fig. 1.
The marks in the figure are respectively: 1-cell chamber asphalt fume collecting pipe, 2-cell side cathode steel bar fume collecting reducer, 3-asphalt fume collecting pipe, 4-wire mesh demister, 5-cell chamber fume collecting hood, 6-cathode steel bar fume collecting hood, 7-cell chamber fume collecting pipe regulating valve, 8-asphalt tar discharging pipe, 9-cathode steel bar group, 10-aluminum cell shell, 11-electrolytic purification system fume exhaust pipe and 12-cell side fume collecting pipe regulating valve.
Detailed Description
The invention is further described below with reference to the drawings and examples, which are not intended to be limiting in any way.
Referring to fig. 1-2, fig. 2 is a view in the direction a of fig. 1.
As can be seen from the figures, the device structure of the present invention mainly comprises the following parts.
(1) Tank pitch fume collecting system: from the tank chamber pitch smoke gas-collecting tube 1
The tank chamber fume collecting hood 5 (2-3) and tank chamber gas collecting tube regulating valve 7. The system mainly aims at collecting asphalt smoke (containing tar) discharged from the inside of the aluminum electrolysis cell during the roasting process;
(2) Tank side cathode steel bar asphalt smoke collecting system: gas collection reducer pipe 2 formed by groove-side cathode steel bar
The cathode steel bar fume collecting hood 6 (the number of groups is the same as that of the cathode steel bar groups 9 of the electrolytic tank) and the tank side gas collecting tube regulating valve 12. The system mainly collects asphalt fume (containing tar) discharged by a cathode steel bar window at the side of the aluminum electrolysis cell during the roasting process;
(3) Asphalt smoke collecting and processing system: from bitumen flue gas header 3
The screen mist eliminator 4, the asphalt tar discharge pipe 8, related brackets and the like. The system mainly aims at collecting all asphalt fume (containing tar) discharged by an electrolytic cell during roasting of the electrolytic cell and effectively filtering the asphalt tar through a wire mesh demister 4 (replaceable) arranged on an asphalt fume collecting pipe 3. The filtered tar can be discharged from the sewage outlet.
In the roasting process of the aluminum electrolysis cell, asphalt smoke discharged by the cathode in the cell and asphalt smoke discharged by the cathode steel bar window on the side part of the cell are collected in a concentrated way through the system and collected to the asphalt smoke collecting pipe 3 for rapid filtration of tar pollutants, so that the exhaust gas discharged by the exhaust pipe 11 entering the electrolytic purification system in the roasting process reaches the discharge standard, and secondary pollution to the pipeline and equipment of the purification system is avoided.
The above is only a specific application example of the present invention, and other embodiments of the present invention are also possible, and all the technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.
Claims (7)
1. An asphalt fume collecting and treating device in the roasting process of an aluminum electrolysis cell is characterized in that: the device comprises a groove chamber asphalt fume collecting system, a groove side cathode steel bar asphalt fume collecting system and an asphalt fume collecting and treating system; the groove chamber asphalt fume collecting system comprises a groove chamber asphalt fume collecting pipe (1), a groove chamber fume collecting hood (5) and a groove chamber fume collecting pipe regulating valve (7); the groove-side cathode steel bar asphalt fume collecting system comprises a groove-side cathode steel bar fume collecting reducer pipe (2), a cathode steel bar fume collecting hood (6) and a groove-side fume collecting pipe regulating valve (12); the asphalt smoke collecting and treating system comprises an asphalt smoke collecting and treating pipe (3), a wire mesh demister (4), an asphalt tar discharging pipe (8) and a supporting bracket thereof; the groove chamber asphalt fume collecting pipe (1) and the groove side cathode steel bar gas collecting reducer pipe (2) are connected with an asphalt fume collecting pipe (3) at the tail end; the groove-side gas collecting pipe regulating valve (12) is arranged at the connecting part of the tail end of the groove-side cathode steel bar gas collecting reducer pipe (2) and the asphalt smoke gas collecting pipe (3); the asphalt fume collecting pipe (3) is connected with a fume exhaust pipe (11) of the electrolytic purification system, and a wire mesh demister (4) is arranged at the connecting part; the asphalt fume collecting pipe (3) is arranged at the flue end of the aluminum electrolysis cell, the front end of the asphalt fume collecting pipe (3) adopts a cone-shaped reducing structure, and an asphalt tar discharging pipe (8) is arranged at the reducing part of the asphalt fume collecting pipe.
2. The asphalt fume treatment device for the roasting process of the aluminum electrolysis cell according to claim 1, wherein: the tank chamber asphalt smoke gas collecting pipe (1) is arranged at the upper part of the tank chamber of the electrolytic tank, adopts a two-stage reducing structure, has a first-stage pipe diameter range of phi 200-300 mm and a second-stage pipe diameter range of phi 350-450 mm; the groove chamber fume collecting hood (5) is arranged at the lower part of the groove chamber asphalt fume collecting pipe (1) and is 2-5 in number; the groove chamber gas collection pipe regulating valve (7) is arranged at the connecting part of the tail end of the second-stage reducing pipeline of the groove chamber asphalt gas collection pipe (1) and the asphalt gas collection pipe (3).
3. The asphalt fume treatment device for the roasting process of the aluminum electrolysis cell according to claim 1, wherein: the number of the cathode steel bar gas collection reducing pipes (2) at the side of the cell is two, and the cathode steel bar gas collection reducing pipes are respectively arranged at two sides of the electrolytic cell; the groove-side cathode steel bar gas collection reducing pipe (2) also adopts a two-stage reducing structure, the diameter range of the first stage is between phi 100 and 200/mm, and the diameter range of the second stage is between phi 200 and 300 mm.
4. A pitch fume treatment device in the roasting process of an aluminum electrolysis cell according to claim 3, wherein: the lower part of the cell side cathode steel bar gas collection reducing pipe (2) is connected with more than two groups of cathode steel bar gas collection covers (6) which are matched with cathode steel bar groups (9) on the cell shell (10) of the aluminum electrolysis cell, and each group of cathode steel bars is provided with one cathode steel bar gas collection cover (6).
5. The asphalt fume treatment device for the roasting process of the aluminum electrolysis cell according to claim 1, wherein: the diameter of the asphalt fume collecting pipe (3) is between phi 400 and 600 mm.
6. The asphalt fume treatment device for the roasting process of the aluminum electrolysis cell according to claim 5, wherein: the number of the silk screen layers of the silk screen demister (4) is 3-5, the number of the silk screen meshes is 9-3000, and the silk screen demister is used for filtering tar particles with the particle size of 3-35 mu m.
7. A method for treating asphalt fume collection in the roasting process of an aluminum electrolysis cell is characterized by comprising the following steps: use of the asphalt fume collecting apparatus for aluminum electrolysis cell roasting process according to claim 1, wherein a cell pitch fume collecting system is provided at the upper part of the cell chamber of the pre-roasting aluminum electrolysis cell during the roasting of the pre-roasting aluminum electrolysis cell to collect tar-containing asphalt fume discharged from the inside of the cell during the roasting of the aluminum electrolysis cell; two groups of tank-side cathode steel bar asphalt fume collecting systems are respectively arranged at two sides of the side part of the aluminum electrolysis tank so as to collect tar-containing asphalt fume discharged by the tank-side cathode steel bar window during the roasting of the aluminum electrolysis tank; an asphalt fume collecting and treating system is arranged at the flue end of the aluminum electrolysis cell to collect all tar-containing asphalt fume discharged by the electrolysis cell during the roasting of the aluminum electrolysis cell, and asphalt tar is effectively filtered by a replaceable wire mesh demister arranged on a collecting pipeline; the filtered tar is discharged from the asphalt tar discharge pipe.
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| CN201711025380.4A CN107653462B (en) | 2017-10-27 | 2017-10-27 | Asphalt smoke gas collection treatment method and device in roasting process of aluminum electrolysis cell |
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| CN201711025380.4A CN107653462B (en) | 2017-10-27 | 2017-10-27 | Asphalt smoke gas collection treatment method and device in roasting process of aluminum electrolysis cell |
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| CN107653462B true CN107653462B (en) | 2023-06-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108301020A (en) * | 2018-02-28 | 2018-07-20 | 高德金 | A kind of novel aluminium electrolysis cell shell structure |
| CN110241441A (en) * | 2018-03-07 | 2019-09-17 | 贾石明 | A kind of multi-functional anode assembly of novel aluminum cell |
| CN108998812B (en) * | 2018-09-29 | 2020-06-16 | 四川启明星铝业有限责任公司 | Method for treating asphalt tar generated in production process of prebaked anode for electrolytic aluminum |
| CN110552026A (en) * | 2019-09-27 | 2019-12-10 | 沈阳铝镁设计研究院有限公司 | Method for collecting gas through cathode steel bar window during roasting start of electrolytic cell |
| CN113481543B (en) * | 2021-08-04 | 2024-06-04 | 贵阳铝镁设计研究院有限公司 | Integral forming smoke exhausting device and method for cathode of electrolytic tank |
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