CN104266499A - Scrap steel preheating electric furnace flue gas waste heat recovery device - Google Patents
Scrap steel preheating electric furnace flue gas waste heat recovery device Download PDFInfo
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- CN104266499A CN104266499A CN201410551669.XA CN201410551669A CN104266499A CN 104266499 A CN104266499 A CN 104266499A CN 201410551669 A CN201410551669 A CN 201410551669A CN 104266499 A CN104266499 A CN 104266499A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention discloses a scrap steel preheating electric furnace flue gas waste heat recovery device. The scrap steel preheating electric furnace flue gas waste heat recovery device comprises a scrap steel preheating channel, a connecting flue, a combustion settling chamber, a flue, a cooler, a dust remover, a fan and a chimney which are connected in sequence, wherein the cooler is a dividing wall type heat exchanger, and the connecting flue, the combustion settling chamber and the flue are of inner wall heat insulated structures. In the scrap steel preheating electric furnace flue gas waste heat recovery device, the connecting flue, the combustion settling chamber and the flue are of the inner wall heat insulated structures, so that the phenomenon that dioxin production is inhibited by slow temperature reduction of smoke from a scrap steel preheating channel outlet is effectively avoided. The cooler is the dividing wall type heat exchanger, can recover smoke waste heat and meanwhile is of splat cooling structure. When internal cooling tubes are three-dimensional outer rib tubes, heat exchange effect between the smoke and a medium in the tubes is remarkably enhanced and the smoke can be rapidly cooled from 800-1000 DEG C to 250 DEG C within 0-2 seconds due to the fact that the outer ribs of the three-dimensional outer rib tubes remarkably decrease the thickness of heat exchange boundary layers of the outer walls of the tubes.
Description
Technical field
The present invention relates to metallurgical technology field, be specifically related to a kind of electric furnace fume residual heat recycle device, particularly a kind of scrap steel preheating electric furnace fume residual heat recycle device.
Background technology
Produce a large amount of high-temperature flue gas during electric furnace smelting, it is the most effective Land use systems of waste heat that the heat of high-temperature flue gas is used for preheating scrap.The flue gas type of cooling after current scrap steel preheating mainly contains 2 kinds, and scheme one is water spray directly cooling.As shown in Figure 1, in which, electric furnace 1 high-temperature flue gas is out after scrap steel preheating passage 2 preheating scrap, outlet temperature is 800 ~ 1000 DEG C, directly enter spray tank 6 cool through connection flue 3, combustion settling chamber 4, flue 5, export about 250 DEG C, and enter sack cleaner 7 after the flue gas mixing of enclosed hood 10 outlet, discharged by blower fan 8, chimney 9 afterwards.Do the waste heat not only wasting flue gas 800 ~ 250 DEG C like this, need a large amount of water spray simultaneously, cause the waste of water.And spray cooling water and become steam, be mixed in flue gas, significantly increase flue gas flow, the load of dedusting fan is increased.The water capacity simultaneously in flue gas easily causes sack cleaner to stick with paste bag.
Scheme two is the cooling of machine power air-cooled or waste heat boiler.As shown in Figure 2, in which, electric furnace 1 high-temperature flue gas is out after scrap steel preheating passage 2 preheating scrap, outlet temperature is 800 ~ 1000 DEG C, mechanical air cooler or waste heat boiler is directly entered through water-cooled connection flue 3, combustion settling chamber 4, flue 5, export about 250 DEG C, and enter sack cleaner 7 after the flue gas mixing of enclosed hood 10 outlet, discharged by blower fan 8, chimney 9 afterwards.
In the program, no matter adopt mechanical air cooler or waste heat boiler, all there is the Slow cooling connecting flue 3, combustion settling chamber 4 and flue 5 pairs of flue gases, mechanical air cooler or waste heat boiler 6 are also the Slow coolings to flue gas simultaneously, in the synthesis of Slow cooling Guo journey Zhong bioxin, the carrying out making bioxin in flue gas not reach " steel industry atmosphere pollutants emission standards " is discharged.
In order to the waste heat reclaiming high-temperature flue gas avoids the generation of bioxin simultaneously, need one can carry out scrap steel preheating, reclaim 800 ~ 250 DEG C of fume afterheats afterwards, avoid the device that bioxin generates simultaneously.
Summary of the invention
The present invention is directed to the deficiency that flue gas waste heat recovery apparatus in prior art can make flue gas Sheng Cheng bioxin and fume afterheat fully reclaim, provide a kind of scrap steel preheating electric furnace fume residual heat recycle device.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
A kind of scrap steel preheating electric furnace fume residual heat recycle device, comprise connect successively scrap steel preheating passage, connect flue, combustion settling chamber, flue, cooler, deduster, blower fan, chimney, cooler adopts dividing wall type heat exchanger, and described connection flue, combustion settling chamber, flue adopt inwall heat insulating construction.
As preferably, dividing wall type heat exchanger, internal cooling pipe adopts outer ribbed pipe.
As preferably, dividing wall type heat exchanger, internal cooling pipe adopts three-D external-rib pipe.
As preferably, dividing wall type heat exchanger, internal cooling pipe adopts steel pipe.
As preferably, dividing wall type heat exchanger shell adopts cooling tube to be spliced.
As preferably, dividing wall type heat exchanger shell adopts insulation construction, and described insulation construction adopts metal pipe, and metal pipe inwall is provided with fire-resistant mud layer, is provided with anchor nail welding and is connected in described metal pipe in fire-resistant mud layer.
As preferably, metal pipe adopts roll of steel plate weldering.
As preferably, dividing wall type heat exchanger shell adopts insulation construction, and described insulation construction adopts xoncrete structure, and the pre-buried anchor studs of concrete inner wall, lays refractory thermal insulating material afterwards.
As preferably, connect flue, refractory material heat insulating construction skin that flue adopts is metal pipe, lay insulating refractory layer in described metal pipe, be provided with anchor studs in described insulating refractory layer, described anchor nail welding is connected on metal pipe.
As preferably, combustion settling chamber skin is xoncrete structure, and the pre-buried anchor studs of described concrete inner wall lays refractory thermal insulating material layer in described mixed earth inwall.
According to the scrap steel preheating electric furnace fume residual heat recycle device of technical scheme of the present invention, connect flue, combustion settling chamber, flue employing inwall heat insulating construction, effectively prevent and occur slow cooling from scrap steel preheating channel outlet flue gas, inhibit the generation of bioxin.Cooler is dividing wall type heat exchanger, can Mist heat recovering, adopt chilling structure simultaneously, when internal cooling pipe adopts three-D external-rib pipe, external fin due to three-D external-rib pipe is significantly thinned the boundary layer of pipe outer wall heat exchange, flue gas is significantly strengthened with the heat exchange of medium in pipe, in 0 ~ 2 second, flue gas can be cooled to less than 250 DEG C from 800 ~ 1000 DEG C rapidly, avoid bioxin to generate, therefore the dividing wall type formula heat exchanger of this kind of structure generates suppression bioxin and has good effect.
Accompanying drawing explanation
Fig. 1 prior art water spray direct cooling system schematic diagram.
Air-cooled or the waste heat boiler cooling system schematic diagram of the existing machine power of Fig. 2.
Fig. 3 is principle of the invention schematic diagram.
Fig. 4 is adiabatic flue schematic sectional representation schematic diagram.
Fig. 5 is three-D external-rib tubular construction schematic diagram.
Fig. 6 is three-D external-rib tube section schematic diagram.
Description of reference numerals:
1 electric furnace,
2 scrap steel preheating passages,
3 connect flue,
31 roll of steel plate welded tubes,
32 insulating refractory layers,
33 anchor studs,
4 combustion settling chambers,
5 flues,
6 coolers,
61 three-D external-rib pipes,
62 is protruding,
7 dedusters,
8 blower fans,
9 chimneys.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail:
Embodiment 1
The electric furnace fume residual heat recycle device of the present embodiment, comprise electric furnace 1, scrap steel preheating passage 2, connect flue 3, combustion settling chamber 4, flue 5, cooler 6, deduster 7, blower fan 8, chimney 9, cooler adopts dividing wall type heat exchanger 6, and connection flue 3, combustion settling chamber 4, flue 5 adopt inwall heat insulating construction; The refractory material heat insulating construction skin that the connection flue 3 of inwall heat insulating construction, flue 5 adopt is roll of steel plate welded tube 31, insulating refractory layer 32 is laid in roll of steel plate welded tube 31, be provided with anchor studs 33 in insulating refractory layer 32, anchor studs 33 is welded in roll of steel plate weldering 31.Combustion settling chamber 4 skin is xoncrete structure, and the pre-buried anchor studs of concrete inner wall, lays refractory thermal insulating material layer in mixed earth inwall.The flue gas that so just effectively prevent 800 ~ 1000 DEG C, at the slow cooling connecting flue 3, combustion settling chamber 4, horizontal flue 5, avoids the generation of bioxin.Connect in practical application flue 3 can become curved flue, horizontal flue or vertically flue also can realize object of the present invention.
Dividing wall type heat exchanger 6 shell adopts insulation construction, and described insulation construction adopts roll of steel plate weldering, and roll of steel plate weldering inwall is provided with fire-resistant mud layer, is provided with anchor nail welding and is connected in the weldering of described roll of steel plate in fire-resistant mud layer.Dividing wall type heat exchanger, internal cooling pipe adopts three-D external-rib pipe 61, intensively outside three-D external-rib pipe 61 tube wall is provided with multiple protruding 62.
Embodiment 2
According to the scheme of embodiment 1, by the insulation construction that dividing wall type heat exchanger 6 shell adopts, replace as follows.Insulation construction adopts xoncrete structure, and the pre-buried anchor studs of concrete inner wall, lays refractory thermal insulating material afterwards.Other schemes are constant.
Embodiment 3
According to the scheme of embodiment 1, by the insulation construction that dividing wall type heat exchanger 6 shell adopts, replace as follows.As preferably, dividing wall type heat exchanger 6 shell adopts cooling tube to be spliced.Other schemes are constant.
Embodiment 4
According to the scheme of embodiment 1 or 2 or 3, by dividing wall type heat exchanger 6, internal cooling pipe adopts three-D external-rib pipe 61, replaces as follows.Dividing wall type heat exchanger 6, internal cooling pipe adopts outer ribbed pipe.Other schemes are constant.
Embodiment 5
According to the scheme of embodiment 1 or 2 or 3, by dividing wall type heat exchanger 6, internal cooling pipe adopts three-D external-rib pipe 61, replaces as follows.Dividing wall type heat exchanger, internal cooling pipe adopts steel pipe.Other schemes are constant.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (10)
1. a scrap steel preheating electric furnace fume residual heat recycle device, comprise connect successively scrap steel preheating passage, connect flue, combustion settling chamber, flue, cooler, deduster, blower fan, chimney, it is characterized in that: described cooler adopts dividing wall type heat exchanger, described connection flue, combustion settling chamber, flue adopt inwall heat insulating construction.
2. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, is characterized in that: described dividing wall type heat exchanger, and internal cooling pipe adopts outer ribbed pipe.
3. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, is characterized in that: described dividing wall type heat exchanger, and internal cooling pipe adopts three-D external-rib pipe.
4. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, is characterized in that: described dividing wall type heat exchanger, and internal cooling pipe adopts steel pipe.
5. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, is characterized in that: described dividing wall type heat exchanger shell adopts cooling tube to be spliced.
6. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, it is characterized in that: described dividing wall type heat exchanger shell adopts insulation construction, described insulation construction adopts metal pipe, metal pipe inwall is provided with fire-resistant mud layer, is provided with anchor nail welding and is connected in described metal pipe in fire-resistant mud layer.
7. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, it is characterized in that: described dividing wall type heat exchanger shell adopts insulation construction, described insulation construction adopts xoncrete structure, and the pre-buried anchor studs of concrete inner wall, lays refractory thermal insulating material afterwards.
8. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, it is characterized in that: the refractory material heat insulating construction skin that described connection flue, flue adopt is metal pipe, insulating refractory layer is laid in described metal pipe, be provided with anchor studs in described insulating refractory layer, described anchor nail welding is connected on metal pipe.
9. scrap steel preheating electric furnace fume residual heat recycle device according to claim 1, is characterized in that: described combustion settling chamber skin is xoncrete structure, and the pre-buried anchor studs of described concrete inner wall, lays refractory thermal insulating material layer in described mixed earth inwall.
10. the scrap steel preheating electric furnace fume residual heat recycle device according to claim 6 or 8, is characterized in that: described metal pipe adopts roll of steel plate weldering.
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| CN201410551669.XA CN104266499A (en) | 2014-10-17 | 2014-10-17 | Scrap steel preheating electric furnace flue gas waste heat recovery device |
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| CN201410551669.XA CN104266499A (en) | 2014-10-17 | 2014-10-17 | Scrap steel preheating electric furnace flue gas waste heat recovery device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807341A (en) * | 2015-05-20 | 2015-07-29 | 中冶赛迪工程技术股份有限公司 | System and technology for purifying electric furnace flue gas and simultaneously utilizing waste heat |
| CN107477596A (en) * | 2017-09-30 | 2017-12-15 | 金建德 | A kind of tail gas from incinerator processing unit and its application method |
| CN110686521A (en) * | 2019-11-20 | 2020-01-14 | 中冶南方工程技术有限公司 | Electric furnace flue gas waste heat utilization method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807341A (en) * | 2015-05-20 | 2015-07-29 | 中冶赛迪工程技术股份有限公司 | System and technology for purifying electric furnace flue gas and simultaneously utilizing waste heat |
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| CN110686521A (en) * | 2019-11-20 | 2020-01-14 | 中冶南方工程技术有限公司 | Electric furnace flue gas waste heat utilization method and system |
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