CN101880898B - Method for recovering flue gas waste heat of aluminum electrolysis cell - Google Patents
Method for recovering flue gas waste heat of aluminum electrolysis cell Download PDFInfo
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- CN101880898B CN101880898B CN 200910111642 CN200910111642A CN101880898B CN 101880898 B CN101880898 B CN 101880898B CN 200910111642 CN200910111642 CN 200910111642 CN 200910111642 A CN200910111642 A CN 200910111642A CN 101880898 B CN101880898 B CN 101880898B
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Abstract
The invention discloses a method for recovering flue gas waste heat of an aluminum electrolysis cell. A waste heat recoverer is arranged on an exhaust branch pipe of the aluminum electrolysis cell. Compared with the prior art, the invention adopts a technical scheme that the waste heat recoverer is in axial symmetry vertically and horizontally, or the flue gas side resistance value generated by the waste heat recoverer is increased or decreased, so that the exhaust pressure difference of an exhaust main pipe on the point of vertically axial symmetry is zero. The exhaust pressure difference of the exhaust main pipe on the point of vertically axial symmetry is zero, so the problem of imbalanced pressure caused by arranging a waste heat recovery system in the exhaust air pipe system of the aluminum electrolysis cell in the prior art is solved. The single waste heat recoverer has small flue gas side resistance, sufficiently utilizes the pressure surplus value in the system without increasing the number of a draught fan, and has the advantages of small depth, convenient ash cleaning and dust removal, and high efficiency. Every waste heat recoverer is a relatively independent system, and can be inspected and maintained on-line at all times, so that hidden dangers can be discovered in advance to ensure safe production.
Description
Technical field
The present invention relates to heat-energy recovering apparatus, be specially adapted to the waste heat recovery of aluminium cell flue gas, utilize residual heat of aluminum reduction cell, save energy consumption, reduce discharging.
Background technology
Aluminium electrolytic industry rarely has pair engineering of aluminium cell flue gas waste heat recovery, rare aluminium cell flue gas waste heat recovery engineering major programme as shown in Figure 2, it is to arrange that at the house steward 5 of aluminium cell 1 smoke evacuation or main 4 one or several waste-heat recoverers 7 satisfy the thermal load demand, flue gas through waste-heat recoverer 7 is discharged by induced draft fan 6 at last, there is following defective in design like this: 1. can't keep original aluminium cell 1 smoke exhaust pipe system pressure balance: because newly-increased waste-heat recoverer resistance crushing concentrates on the house steward 5, cause purification system both sides resistance difference, this resistance difference singly is not the resistance that the waste-heat recoverer that increases newly produces, the resistance that produces because of a variety of causes (such as the waste-heat recoverer dust stratification) when also comprising operation, so both sides smoke evacuation purification system pressure imbalance, not only affect the waste heat recovery rate, and had potential safety hazard; 2. the waste-heat recoverer fume side resistance in this scheme is larger, can't accomplish only to utilize original induced draft fan 6 operation surplus capacities that put into operation, and need set up, establish newly induced draft fan 6, and input increases manufacturing facilities; 3. aluminium cell 1 flue gas belongs to high ash-laden gas, guarantee that waste-heat recoverer 7 deashing dedustings are convenient, be the effectively basic assurance of operation of system efficiently, waste-heat recoverer 7 longitudinal degrees that the prior art scheme adopts are large, huge structure, the deashing dedusting is very inconvenient, and can't realize that online start checks at any time, scent a hidden danger in advance; 4. can not carry out on-line maintenance, maintenance to waste-heat recoverer 7 in process of production, can not normally move but also allow explained hereafter equipment aluminium cell 1 normally move because it will not only make aluminium cell 1 flue gas waste heat recovery system.5. can't guarantee that the interior flue gas of waste-heat recoverer and the temperature difference that is heated liquid (being heat, cold fluid in the waste-heat recoverer) reach the reasonable value scope of practical implementation.
Summary of the invention
For the deficiencies in the prior art part, the invention provides a kind of novel method for recovering flue gas waste heat of aluminum electrolysis cell, keep original aluminium cell smoke exhaust pipe system pressure balance, the input of Decrease production cost, equipment dedusting easy, can realize on-line maintenance, inspection, the safety in guaranteeing to produce.
For achieving the above object, technical solution of the present invention is:
A kind of method for recovering flue gas waste heat of aluminum electrolysis cell, the flue gas of aluminium cell discharging is sequentially through smoke evacuation arm, smoke evacuation main, smoke evacuation house steward, discharge finally by induced draft fan, on aluminium cell smoke evacuation arm, be equipped with for reclaiming from the waste-heat recoverer of the direct flue gas of discharging of aluminium cell.
The usefulness of technique scheme is:
Compared with prior art, technical scheme of the present invention has following remarkable advantage: 1. be set to the transverse axis symmetry because smoke evacuation main spread configuration of the present invention is Z-axis symmetry, smoke evacuation house steward, because the setting position of the described waste-heat recoverer of employing not only satisfies the Z-axis symmetry and satisfies the axisymmetric technical scheme of level or the fume side Resistance Value of increase and decrease waste-heat recoverer generation, making the smoke evacuation main is 0 in the smoke evacuation pressure difference of Z-axis symmetric points; The smoke evacuation house steward is 0 in the smoke evacuation pressure difference of transverse axis symmetric points, has solved the pressure imbalance problem that aluminium cell smoke exhaust pipe system causes because installing residual neat recovering system additional in the prior art.2. since whenever newly-increased waste-heat recoverer be installed in pipeline distance from induced draft fan on the nearest aluminium cell smoke evacuation arm, take full advantage of the pressure surplus capacity (being approximately 300Pa) that corresponding aluminium cell has in whole aluminium cell fume exhaust system.And the fume side resistance that separate unit waste-heat recoverer of the present invention produces is little, and whole residual neat recovering system fume side resistance equals the fume side resistance that the separate unit waste-heat recoverer produces, thereby need not establish the number of units of induced draft fan newly.3. separate unit waste-heat recoverer volume of the present invention is little, longitudinal degree is shallow, deashing dedusting convenience, efficient.4. each waste-heat recoverer of the present invention all is a relatively independent system, and the inspection of can starting shooting online at any time, maintenance do not affect the normal operation of whole flue gas waste heat recovery system and aluminium cell, scent a hidden danger in advance, guarantee production safety.5. the temperature difference that possesses heat, cold fluid in the waste-heat recoverer is set to more than or equal to 20 ℃ of conditions, guarantees that waste-heat recoverer meets the standard of practical implementation.
Description of drawings
Fig. 1 is principle of work synoptic diagram of the present invention;
Fig. 2 is prior art principle of work synoptic diagram.
Embodiment
The present invention now is described in conjunction with the accompanying drawings and embodiments.
A kind of method for recovering flue gas waste heat of aluminum electrolysis cell as shown in Figure 1, the flue gas of aluminium cell 1 discharging is sequentially through smoke evacuation arm 3, smoke evacuation main 4, smoke evacuation house steward 5, discharge finally by induced draft fan 6, the present invention is equipped with on the smoke evacuation arm 3 of each aluminium cell 1 for reclaiming from the waste-heat recoverer 2 of aluminium cell 1 direct flue gas of discharging each waste-heat recoverer 2 corresponding aluminium cell 1.Whenever newly-increased waste-heat recoverer 2 is installed in pipeline distance from induced draft fan on the nearest aluminium cell 1 smoke evacuation arm 3.Described smoke evacuation main 4 spread configurations are that Z-axis is symmetrical, and smoke evacuation house steward 5 is set to the transverse axis symmetry, and for the smoke evacuation pressure difference that makes smoke evacuation main 4 transverse axis symmetric points is 0, and the smoke evacuation pressure difference of smoke evacuation house steward 5 Z-axis symmetric points is 0; The invention provides two kinds of embodiments: 1. described waste-heat recoverer 2 Z-axises are symmetricly set on the smoke evacuation arm 3, and satisfy the transverse axis symmetry.2. increase and decrease the fume side Resistance Value that waste-heat recoverer 2 produces, the smoke evacuation pressure difference that satisfies Z-axis symmetric points on the smoke evacuation main 4 is 0; The smoke evacuation pressure difference of smoke evacuation house steward 5 transverse axis symmetric points is 0.The temperature difference that described waste-heat recoverer 2 possesses wherein heat, cold fluid is set to the condition more than or equal to 20 ℃, thereby guarantees that waste-heat recoverer reaches the standard that meets the practical implementation temperature difference.
Claims (5)
1. method for recovering flue gas waste heat of aluminum electrolysis cell, the flue gas of aluminium cell (1) discharging is sequentially through smoke evacuation arm (3), smoke evacuation main (4), smoke evacuation house steward (5), discharge finally by induced draft fan (6), it is characterized in that: on aluminium cell (1) smoke evacuation arm (3), be equipped with for reclaiming from the waste-heat recoverer (2) of the direct flue gas of discharging of aluminium cell (1); Smoke evacuation main (4) spread configuration is that Z-axis is symmetrical, smoke evacuation house steward (5) is set to the transverse axis symmetry, the setting position of waste-heat recoverer not only satisfies the Z-axis symmetry and satisfies the fume side Resistance Value that transverse axis is symmetrical or the increase and decrease waste-heat recoverer produces, and making smoke evacuation main (4) is 0 in the smoke evacuation pressure difference of Z-axis symmetric points; Smoke evacuation house steward (5) is 0 in the smoke evacuation pressure difference of transverse axis symmetric points.
2. a kind of method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 1, it is characterized in that: every newly-increased waste-heat recoverer (2) is installed in pipeline distance from induced draft fan (6) on nearest aluminium cell (1) the smoke evacuation arm (3).
3. a kind of method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 1 or 2, it is characterized in that: on more than one aluminium cell (1) smoke evacuation arm (3), be equipped with for reclaiming from the waste-heat recoverer (2) of the direct flue gas of discharging of aluminium cell (1) the corresponding aluminium cell (1) of each waste-heat recoverer (2).
4. a kind of method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 1 or 2, it is characterized in that: whenever newly-increased waste-heat recoverer is installed in pipeline distance from induced draft fan on the nearest aluminium cell smoke evacuation arm, takes full advantage of the pressure surplus capacity that corresponding aluminium cell has in whole aluminium cell fume exhaust system.
5. a kind of method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 3, it is characterized in that: whenever newly-increased waste-heat recoverer is installed in pipeline distance from induced draft fan on the nearest aluminium cell smoke evacuation arm, takes full advantage of the pressure surplus capacity that corresponding aluminium cell has in whole aluminium cell fume exhaust system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910111642 CN101880898B (en) | 2009-05-04 | 2009-05-04 | Method for recovering flue gas waste heat of aluminum electrolysis cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910111642 CN101880898B (en) | 2009-05-04 | 2009-05-04 | Method for recovering flue gas waste heat of aluminum electrolysis cell |
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| Publication Number | Publication Date |
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| CN101880898A CN101880898A (en) | 2010-11-10 |
| CN101880898B true CN101880898B (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910111642 Active CN101880898B (en) | 2009-05-04 | 2009-05-04 | Method for recovering flue gas waste heat of aluminum electrolysis cell |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102134727B (en) * | 2011-03-10 | 2012-10-31 | 伊川龙海科技实业有限公司 | Method for recycling waste heat of electrolytic cell and device thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1958866A (en) * | 2006-10-10 | 2007-05-09 | 沈阳铝镁设计研究院 | Air feeding technique and equipment for transporting alumina in fume cleaning of aluminum cell |
| CN101044267A (en) * | 2004-09-16 | 2007-09-26 | 诺尔斯海德公司 | Method and a system for energy recovery and/or cooling |
| CN101054688A (en) * | 2007-05-22 | 2007-10-17 | 东北大学设计研究院（有限公司） | Remaining heat recovery system and device for aluminum electrolysis bath |
| CN201141741Y (en) * | 2007-11-30 | 2008-10-29 | 河南中孚实业股份有限公司 | Waste heat recovery device of gaseous medium aluminum cell |
-
2009
- 2009-05-04 CN CN 200910111642 patent/CN101880898B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101044267A (en) * | 2004-09-16 | 2007-09-26 | 诺尔斯海德公司 | Method and a system for energy recovery and/or cooling |
| CN1958866A (en) * | 2006-10-10 | 2007-05-09 | 沈阳铝镁设计研究院 | Air feeding technique and equipment for transporting alumina in fume cleaning of aluminum cell |
| CN101054688A (en) * | 2007-05-22 | 2007-10-17 | 东北大学设计研究院（有限公司） | Remaining heat recovery system and device for aluminum electrolysis bath |
| CN201141741Y (en) * | 2007-11-30 | 2008-10-29 | 河南中孚实业股份有限公司 | Waste heat recovery device of gaseous medium aluminum cell |
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| CN101880898A (en) | 2010-11-10 |
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