CN102330117A - Safe aluminium cell exhaust gas waste heat recovery method - Google Patents
Safe aluminium cell exhaust gas waste heat recovery method Download PDFInfo
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- CN102330117A CN102330117A CN2010102245772A CN201010224577A CN102330117A CN 102330117 A CN102330117 A CN 102330117A CN 2010102245772 A CN2010102245772 A CN 2010102245772A CN 201010224577 A CN201010224577 A CN 201010224577A CN 102330117 A CN102330117 A CN 102330117A
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- smoke evacuation
- waste heat
- flue gas
- cell
- waste
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Abstract
The invention discloses a safe aluminium cell exhaust gas waste heat recovery method, which mounts a waste heat recoverer for recovering the waste heat of exhaust gas directly exhausted from an aluminium cell on the pipe section of a branch exhaust pipe of the aluminium cell outside a cell workshop wall and along the flowing direction of the exhaust gas in an exhaust main. Compared with the prior art, the method not only keeps the wind resistance and the wind pressure of an exhaust system unchanged, the increase of resistance at 0 and the original pressure of the exhaust pipe of the cell in balance, but also implements the industrial regulation that liquid medium cannot enter the cell workshop, thus preventing the heated liquid of a waste heat recovery system from leaking into a cell system. The method mounts a liquid flow stopper on the exhaust gas pipe before the exhaust gas intake side of each waste heat recoverer to prevent liquid from flowing toward the cell, thus enhancing the safety of the system. Each waste heat recoverer is a relatively independent system, the conventionally designed upwardly inclined branch exhaust gas pipe becomes a bypass exhaust gas pipe, the waste heat recoverer can be started up to be checked and maintained on line at any time, so that potential hazards can be discovered in advance, and thereby the safety of production is guaranteed.
Description
Technical field
The present invention relates to a kind of exhaust heat recovering method, 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 is as shown in Figure 2; It is to arrange that on the house steward 14 of aluminium cell 1 smoke evacuation or main 9 one or several waste-heat recoverers 13 satisfy the thermal load demand; Discharged by induced draft fan 15 at last through the flue gas of waste-heat recoverer 13, there is following defective in plan like this: 1. can't keep original aluminium cell system smoke exhaust pipe system pressure balance; 2. the waste-heat recoverer fume side resistance in this scheme is bigger, increases SR, increases the air inducing unit load, increases to produce to drop into; 3. aluminium cell 1 flue gas belongs to high ash-laden gas, and waste-heat recoverer 13 longitudinal degrees that the prior art scheme is adopted are big, structure is huge, and the deashing dedusting is very inconvenient, and can't realize online at any time start inspection, scents a hidden danger in advance; 4. can not carry out on-line maintenance, maintenance to waste-heat recoverer 13 in process of production.Based on above deficiency; Propose another kind of aluminium cell flue gas waste heat recovery and utilize method; As shown in Figure 3, it is on aluminium cell 1 and the smoke evacuation arm 10 of smoke evacuation between the main 9, to arrange that waste-heat recoverer 16 reclaims the waste heat that corresponding electrolyzer 1 is discharged flue gas, though plan has overcome the defective of aforementioned schemes like this; Make stable, recycle the electrolyzer fume afterheat efficiently and in production reality, become practicable method; But the weak point of still having: 1. on smoke evacuation arm 10, arrange waste-heat recoverer 16, waste-heat recoverer 16 must be in aluminum electrolyzer 1 residing aluminium electrolysis shop within the walls outward, causes the liquid medium that is used for recovery waste heat to have to be introduced in the aluminium electrolysis shop; The industry standard that does not as far as possible get into aluminium electrolysis shop with liquid medium is conflicted mutually, increases project implementation difficulty; 2. because smoke evacuation main 9 is higher than corresponding electrolyzer 1, smoke evacuation arm 10 is acclivitous from electrolyzer 1 end, is provided with waste-heat recoverer 16 therebetween, and waste-heat recoverer 16 includes the liquid medium that is used for recovery waste heat, has increased sense of insecurity.
Summary of the invention
To the weak point that exists in the prior art; The present invention provides a kind of novel safer method for recovering flue gas waste heat of aluminum electrolysis cell; Input, the equipment dedusting that keep original aluminium cell smoke exhaust pipe system pressure balance, reduces production cost be easy, can realize on-line maintenance, inspection, the safety in guaranteeing to produce.On the basis of the industry standard of not advancing aluminium electrolysis shop in accordance with liquid medium, fundamentally stop to exist residual neat recovering system to be heated the possibility of leak of liquid to electrolyzer system.
For realizing above-mentioned purpose, technical scheme of the present invention is:
A kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell; The aluminium cell discharged flue gas is in regular turn through smoke evacuation arm, smoke evacuation main, smoke evacuation house steward; After induced draft fan discharge; It is characterized in that: another smoke evacuation arm is drawn at a fixed point place on aluminium cell fume emission arm; After the smoke evacuation arm of drawing extends the aluminium electrolysis shop exterior wall, break-in for electrolyzer smoke evacuation main in the flue gas flow direction arm of discharging fume in the same way, on this smoke evacuation arm, be equipped with and be used to reclaim the waste-heat recoverer of directly discharging the waste heat of flue gas from aluminium cell.
The usefulness of technique scheme is:
Compared with prior art; Advantage below technical scheme of the present invention has not only kept: 1. solved the pressure imbalance problem that aluminium cell smoke exhaust pipe system causes because of installing residual neat recovering system additional in the prior art; Can keep original balance constant; 2. make full use of the pressure surplus capacity that corresponding aluminium cell is had 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, need not establish the platform number of induced draft fan newly, and 3. separate unit waste-heat recoverer volume is little, longitudinal degree is shallow, deashing dedusting convenience, efficient; 4. possess that the temperature difference of cold and hot fluid is set to more than or equal to 20 ℃ of conditions in the waste-heat recoverer, guarantee that waste-heat recoverer meets the standard of engineering practical application; Technical scheme of the present invention has also fundamentally solved is installing the difficult problem that waste-heat recoverer is faced when engineering is practical on the electrolyzer smoking pipe: 1., waste-heat recoverer is placed in the potroom exterior wall outside, with the main of discharging fume on the in-phase horizontal branch pipe of flue gas; Thereby observe the industry standard that liquid medium does not advance aluminium electrolysis shop; Possess practical possibility, reduce application difficulty; 2., be arranged in this position not only waste-heat recoverer liquid side seepage liquid can not advance potroom, and waste heat is added device gas phase side seepage liquid and also can be had smoke pipe to flow into the electrolyzer workshop; 3., establish liquid fluid stopping device before waste-heat recoverer inlet end gas fume valve and between the potroom exterior wall, fundamentally stop to exist residual neat recovering system be heated leak of liquid to electrolyzer system maybe; 4., mix in the same way with flue gas in the main with maller angle, get into than improving flow of flue gas in the main with the right angle through the flue gas of waste heat recovery; 5., flue gas arm and inlet be positioned at the main side, and and the valley that enters the mouth be higher than smoke evacuation main valley, get rid of dirt and fall interference; 6., the flue gas of waste-heat recoverer is equipped with Flue valve respectively on the oral-lateral flue; The smoking pipe that tilts of conventional design also is provided with gas fume valve; This smoking pipe that tilts becomes other flue; But waste-heat recoverer online at any time start inspection, maintenance do not influence electrolyzer production, increase the security of system sense; 7., the waste-heat recoverer that adopted is various forms fume side low resistance interchanger, flue gas flow smaller or equal to this pressure surplus capacity, does not increase the induced draft fan load of electrolyzer smoke evacuation wind system through waste-heat recoverer cigarette system gas collateral resistance.
Description of drawings
Fig. 1 is a principle of work synoptic diagram of the present invention;
Fig. 2 is existing a kind of technical work principle schematic;
Fig. 3 is existing another kind of technical work principle schematic.
Embodiment
Combine accompanying drawing and embodiment that the present invention is described at present.
A kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as shown in Figure 1; A smoke evacuation arm 2 is drawn at a fixed point A place on aluminium cell 1 fume emission arm 10; After smoke evacuation arm 2 extends aluminium electrolysis shop exterior wall 12; Break-in for electrolyzer smoke evacuation main 9 in the flue gas flow directions arm 4 of discharging fume in the same way, on smoke evacuation arm 4, be equipped with and be used to reclaim the waste-heat recoverer 6 of directly discharging the waste heat of flue gas from aluminium cell 1.Flue gas flow directions in the same way in waste-heat recoverer 6 exhanst gas outlet sides smoke evacuation by-path 8 and the smoke evacuation main 9; And smoke evacuation arm 8 is incorporated smoke evacuation main 9 into the maller angle that is not more than 90 ° of angles; And and the bit that enters the mouth is in the lateral location of smoke evacuation main 9, and and the valley that enters the mouth be higher than the bottom of the main 9 of discharging fume.
Flue gas at waste-heat recoverer 6 is equipped with Flue valve 3 and Flue valve 7 respectively on the oral-lateral flue, on smoking pipe 10, be provided with gas fume valve 11, and smoking pipe 10 becomes other flue.Before waste-heat recoverer 6 smoke inlet ends and on the smoke evacuation arm between the aluminium electrolysis shop exterior wall 12, be provided with liquid fluid stopping device 5.
Described waste-heat recoverer 6 is various forms fume side low resistance interchanger; The Resistance Value of its fume side does not increase the induced draft fan load of electrolyzer smoke evacuation wind system smaller or equal to the pressure surplus capacity that corresponding aluminium cell 1 is had in whole aluminium cell fume exhaust system.
Claims (11)
1. the method for recovering flue gas waste heat of aluminum electrolysis cell of a safety; It is characterized in that: a smoke evacuation arm (2) is drawn at a last fixed point A place at aluminium cell (1) fume emission arm (10); After the smoke evacuation arm (2) of drawing extends aluminium electrolysis shop exterior wall (12); Break-in for interior the flue gas flow direction of electrolyzer smoke evacuation main (9) arm (4) of discharging fume in the same way, on smoke evacuation arm (4), be equipped with and be used for the waste heat of flue gas is directly discharged in recovery from aluminium cell (1) waste-heat recoverer (6).
2. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 1 is characterized in that: newly-increased waste-heat recoverer (6) exhanst gas outlet side flue (8) and the interior flue gas flow direction of smoke evacuation main (9) in the same way, and to be not more than 90
oThe maller angle at angle is incorporated smoke evacuation main (9) into.
3. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 1; It is characterized in that: the flue gas at waste-heat recoverer (6) is equipped with Flue valve (3) and Flue valve (7) respectively on oral-lateral smoke evacuation arm, on smoke evacuation arm (10), be provided with Flue valve (11).
4. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 2; It is characterized in that: the flue gas at waste-heat recoverer (6) is equipped with Flue valve (3) and Flue valve (7) respectively on oral-lateral smoke evacuation arm, on smoke evacuation arm (10), be provided with Flue valve (11).
5. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell described in arbitrary claim in the claim 1 to 4 is characterized in that: before waste-heat recoverer (6) smoke inlet end and on the smoke evacuation arm between the aluminium electrolysis shop exterior wall (12), be provided with liquid fluid stopping device (5).
6. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell described in arbitrary claim in the claim 1 to 4; It is characterized in that: that newly-increased waste-heat recoverer (6) exhanst gas outlet side smoke evacuation arm (8) is incorporated smoke evacuation main (9) in the same way into and the bit that enters the mouth is in the lateral location of smoke evacuation main (9), and and the valley that enters the mouth be higher than the bottom of smoke evacuation main (9).
7. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 5; It is characterized in that: that newly-increased waste-heat recoverer (6) exhanst gas outlet side smoke evacuation arm (8) is incorporated smoke evacuation main (9) in the same way into and the bit that enters the mouth is in the lateral location of smoke evacuation main (9), and and the valley that enters the mouth be higher than the bottom of smoke evacuation main (9).
8. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell described in arbitrary claim in the claim 1 to 4; It is characterized in that: the waste-heat recoverer of newly establishing (6) is a various forms fume side low resistance interchanger, the pressure surplus capacity that the Resistance Value of its fume side is had in whole aluminium cell fume exhaust system smaller or equal to corresponding aluminium cell (1).
9. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 5; It is characterized in that: the waste-heat recoverer of newly establishing (6) is a various forms fume side low resistance interchanger, the pressure surplus capacity that the Resistance Value of its fume side is had in whole aluminium cell fume exhaust system smaller or equal to corresponding aluminium cell (1).
10. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 6; It is characterized in that: the waste-heat recoverer of newly establishing (6) is a various forms fume side low resistance interchanger, the pressure surplus capacity that the Resistance Value of its fume side is had in whole aluminium cell fume exhaust system smaller or equal to corresponding aluminium cell (1).
11. a kind of safe method for recovering flue gas waste heat of aluminum electrolysis cell as claimed in claim 7; It is characterized in that: the waste-heat recoverer of newly establishing (6) is a various forms fume side low resistance interchanger, the pressure surplus capacity that the Resistance Value of its fume side is had in whole aluminium cell fume exhaust system smaller or equal to corresponding aluminium cell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102245772A CN102330117A (en) | 2010-07-13 | 2010-07-13 | Safe aluminium cell exhaust gas waste heat recovery method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102245772A CN102330117A (en) | 2010-07-13 | 2010-07-13 | Safe aluminium cell exhaust gas waste heat recovery method |
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| CN102330117A true CN102330117A (en) | 2012-01-25 |
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| CN2010102245772A Pending CN102330117A (en) | 2010-07-13 | 2010-07-13 | Safe aluminium cell exhaust gas waste heat recovery method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123632A (en) * | 2016-08-23 | 2016-11-16 | 昆明理工大学 | A kind of method utilizing residual heat of aluminum reduction cell to generate electricity |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101305114A (en) * | 2005-11-14 | 2008-11-12 | 普基铝业 | Electrolytic cell with a heat exchanger |
| CN101357367A (en) * | 2008-09-19 | 2009-02-04 | 昆明理工大学 | Method for processing waste cell-lining of aluminum cell using coal slack |
| CN201485517U (en) * | 2009-05-04 | 2010-05-26 | 厦门热工环保系统工程有限公司 | Aluminum cell smoke residual heat reclaiming system |
-
2010
- 2010-07-13 CN CN2010102245772A patent/CN102330117A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101305114A (en) * | 2005-11-14 | 2008-11-12 | 普基铝业 | Electrolytic cell with a heat exchanger |
| CN101357367A (en) * | 2008-09-19 | 2009-02-04 | 昆明理工大学 | Method for processing waste cell-lining of aluminum cell using coal slack |
| CN201485517U (en) * | 2009-05-04 | 2010-05-26 | 厦门热工环保系统工程有限公司 | Aluminum cell smoke residual heat reclaiming system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123632A (en) * | 2016-08-23 | 2016-11-16 | 昆明理工大学 | A kind of method utilizing residual heat of aluminum reduction cell to generate electricity |
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Application publication date: 20120125 |