CN103591799B - Furnace profile structure of rotary hearth furnace - Google Patents
Furnace profile structure of rotary hearth furnace Download PDFInfo
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- CN103591799B CN103591799B CN201310555759.1A CN201310555759A CN103591799B CN 103591799 B CN103591799 B CN 103591799B CN 201310555759 A CN201310555759 A CN 201310555759A CN 103591799 B CN103591799 B CN 103591799B
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Abstract
A furnace profile structure of a rotary hearth furnace comprises an annular cavity, the annular cavity sequentially comprises a material inlet and outlet area, a first preheating area, a second reduction area, a flue area, a third reduction area and a fourth reduction area according to the flow direction of dust mud. The flow direction of flue gas generated in the first preheating area is the same as that of the dust mud, the flow direction of flue gas generated in the second reduction area is the same as that of the dust mud, a flue gas outlet of the flue area is laterally horizontal, the flow direction of flue gas generated in the third reduction area is opposite to that of the dust mud, and the flow direction of flue gas generated in the fourth reduction area is opposite to that of the dust mud. The annular cavity is nonuniform in height, and the portion, where the first preheating area, the second reduction area and the flue area are located, of the annular cavity is higher than the portion, where the material inlet and outlet area, the third reduction area and the fourth reduction area are located, of the annular cavity.
Description
Technical field
The present invention relates to iron and steel producing apparatus field, particularly a kind of furnace type structure of rotary hearth furnace.
Background technology
Iron and steel enterprise often produces the dirt mud that 1t steel will produce about 100kg, containing harmful elements such as zinc, potassium, sodium in the dirt mud of about 30%.By adopting the Direct Reduction Technology of rotary hearth furnace, can effectively above-mentioned harmful element be reclaimed and be used, therefore obtain the great attention of domestic and international iron and steel enterprise.
From domestic and international rotary hearth furnace running condition, the greatest problem of existence is waste heat boiler and interchanger blocking.In rotary hearth furnace production process, flue dust generation is comparatively large, and the rotary hearth furnace of year process 200,000 t iron and steel enterprise dirt mud is disposed to flue gas about 150,000 m of 200 DEG C, sack cleaner end
3/ h.Therefore large exhaust gas volumn flow velocity certainly will take away greatly the dirt mud particle on more pelletizing surfaces, increases follow-up waste heat boiler and interchanger blocking Probability.
Domestic and international existing rotary hearth furnace is annular contour cavity, charging and discharging keep the angle of about 15 °, be exhanst gas outlet at feeding side, with the angle of opening for feed about about 30 °, make stream and flue gas flow inverse motion, make full use of the sensible heat of flue gas, but flue gas range ability strengthens simultaneously, flow velocity increases, and the solid dust taken away in flue gas increases; The anxious heat of high temperature makes dirt mud burst in addition increases Dust Capacity, affects the heat exchange efficiency of follow-up waste heat boiler and interchanger.
Summary of the invention
The present invention is directed to prior art above shortcomings, provide a kind of profile structure of rotary hearth furnace, reach the technique effect of the dirt mud amount reduced in flue gas.
The present invention is achieved through the following technical solutions:
A kind of profile structure of rotary hearth furnace, for the reduction treatment of dirt mud in steel manufacture process, comprise an annular housing, annular housing rotates along a pre-determined direction, and annular housing, according to the flow direction of dirt mud, comprises successively:
Input and output material district, in order to the turnover of dirt mud;
Preheating one district, is heated up by external fuel heat supply, and the flow direction of the flue gas of generation is identical with flowing to of dirt mud;
Reduce 2nd district, heated up by external fuel heat supply, the flow direction of the flue gas of generation is identical with flowing to of dirt mud;
Flue district, comprises exhanst gas outlet, and exhanst gas outlet is side Horizontal Exit;
Reduce 3rd district, in order to be reduced by the carbon of dirt mud inside, the flow direction of the flue gas of generation is contrary with the flow direction of dirt mud;
Reduce 4th district, in order to be reduced by the carbon of dirt mud inside, the flow direction of the flue gas of generation is contrary with the flow direction of dirt mud;
Wherein, the height of annular housing is inconsistent, preheating one district, reduce 2nd district, place, flue district annular housing aspect ratio input and output material district, to reduce 3rd district, the height of annular housing at four places, district of reducing high.
Preferably, preheating one district, reduce 2nd district, place, flue district the height of annular housing be 2.5 meters.
Preferably, input and output material district, to reduce 3rd district, the height of annular housing at four places, district of reducing be 1.2 meters.
Preferably, the inner width of annular housing is 5 meters.
Preferably, preheating one district, the height of annular housing at two places, district of reducing are maximum.
Preferably: input and output material district circumferentially accounts for 34 ~ 38 degree at annular housing; Preheating one district circumferentially accounts for 76 ~ 80 degree at annular housing; Reducing 2nd district circumferentially accounts for 70 ~ 74 degree at annular housing; Flue district circumferentially accounts for 22 ~ 26 degree at annular housing; Reducing 3rd district circumferentially accounts for 70 ~ 74 degree at annular housing; Reducing 4th district circumferentially accounts for 76 ~ 80 degree at annular housing.
Accompanying drawing explanation
Shown in Fig. 1 is cross-sectional structure schematic diagram of the present invention;
Shown in Fig. 2 to Fig. 6 is workflow exploded view of the present invention.
Embodiment
Below with reference to accompanying drawing of the present invention; clear, complete description and discussion are carried out to the technical scheme in the embodiment of the present invention; obviously; as described herein is only a part of example of the present invention; it is not whole examples; based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, be further explained for specific embodiment below in conjunction with accompanying drawing, and each embodiment does not form the restriction to the embodiment of the present invention.
Please refer to Fig. 1, a kind of profile structure of rotary hearth furnace that the present embodiment provides, rotary hearth furnace is divided into six regions along material direction, be respectively input and output material district 1, preheating one district 2, reduce two districts 3, flue district 4, reduce three districts 5, reduce four districts 6.Input and output material district accounts for 34 ° ~ 38 ° of whole circumference, preheating one district accounts for 76 ° ~ 80 ° of whole circumference, reducing 2nd district accounts for 70 ° ~ 74 ° of whole circumference, flue district accounts for 22 ° ~ 26 ° of whole circumference, reducing 3rd district accounts for 70 ° ~ 74 ° of whole circumference, reduce 4th district account for whole circumference 76 ° ~ 80 ° (be successively in the present embodiment for 36 °, input and output material district, 78 °, preheating one district, reduce 72 °, 2nd district, 24 °, flue district, reduce 72 °, 3rd district, reduce 78 °, 4th district, but the present invention does not limit at this).The height of annular housing is inconsistent, preheating one district 2, reduce two districts 3, place, flue district 4 annular housing aspect ratio input and output material district 1, to reduce three districts 5, the height of annular housing at four places, district 6 of reducing high.
In the present embodiment, the burner hearth inner width of rotary hearth furnace is 5 meters (namely the width in six regions is all 5 meters), preheating one district 2, to reduce two districts 3, flue district 4 burner hearth inner height be 2.5 meters, reduce three districts 5, reduce four districts 6 and input and output material district 1 burner hearth inner height and be 1.2 meters (the present invention just illustrates the burner hearth inner width of rotary hearth furnace and the height in each district at this, do not limit it, technician can adjust according to practical situation).The exhanst gas outlet in flue district 4 is side outlet.
Please refer to Fig. 2 to Fig. 6, understand principle of work of the present invention for the ease of technician, below workflow of the present invention is introduced:
Please refer to Fig. 2, first add dirt mud by special equipment in input and output material district, the number of plies of pelletizing adjusts according to the size of itself, general layout one deck half; Please refer to Fig. 3, dirt mud is at preheating one district and reduction two district's heating reductions, and mainly pelletizing surface high-temp reduction consolidation chaps; Please refer to Fig. 4, flue gas collects in flue district, enters vertical gas pass by horizontal flue, the air after-flame that CO a small amount of in flue gas is passed into by vertical gas pass; Please refer to Fig. 5, in reduction three district and reduction 4th district, dirt mud inside under high temperature discharges CO by the direct-reduction of carbon, CO is in burner hearth combustion, simultaneously flue gas stream against pelletizing traffic direction by temperature from reduction four zone to reduction three district, reduce the supply of fuel, red heat pelletizing volume-diminished 0.6 ~ 0.8 times; Please refer to Fig. 6, the red heat pelletizing of about 1100 DEG C discharges burner hearth by special equipment.
The benefit of furnace type structure of the present invention is:
1, input and output material district furnace height reduces, and is convenient to the uniform distribution of dirt mud, and because drop is little, the probability that sludge pellet is pulverized reduces, and decreases dust content in flue gas.This region burner hearth is low in addition, is convenient to the maintenance of feeding unit and discharging spiral.
2, preheating one district, the two district's furnace heights that reduce are maximum, because the heat supply in this region mainly through external fuel makes pelletizing heat up, therefore need larger combustion space, hot gas flow also can be avoided sludge pellet disturbance, reduce the generation of dust.Although large at this region flue gas flow, the flow direction of flue gas is consistent with the flow direction of material, alleviates air-flow washing away dirt mud.
3, flue district furnace height is also large, can reduce the flow velocity of flue gas, alleviate flue gas washing away the resistance to material of burner hearth.Exhanst gas outlet is side Horizontal Exit, is convenient to the maintenance of the resistance to material of high-temperature pipe.
4, reduce 3rd district, to reduce 4th district be high temperature reduction district, the carbon in this region mainly through the inside of pelletizing reduces, and furnace height reduces, higher fire box temperature can be kept, reduce the heat supply of external fuel, reduce the consumption of coal gas, final exhaust gas volumn reduces.Again because flue gas reduces to the distance exported, the Dust Capacity taken away compared with the flue gas of the less flow of low flow velocity reduces greatly.Be contrary in the flow direction of this region flue gas and the flow direction of material, can utilize the waste heat of high-temperature flue gas, now dirt mud surface has been reduced substantially, defines hard appearance, and less exhaust gas volumn has not been formed washes away impact to sludge pellet.
5, for preventing the anxious thermal spalling of pelletizing, existing rotary hearth furnace preheating zone temperature is generally below 900 DEG C, and exhanst gas outlet is located at preheating zone, and because the gasification temperature of zinc is at about 906 DEG C, zinc oxide is in the resistance to material enrichment of the burner hearth of preheating zone.Exhanst gas outlet of the present invention is arranged between reduction two district and reduction 3rd district, reduce 3rd district, to reduce 4th district be high-temperature zone, in flue gas, Zn content is maximum, and the large flue gas of zinc content directly discharges without reduction two district and preheating one district.The work-ing life of the resistance to material of burner hearth can significantly increase.
6, due to the mid-way being arranged on charging and discharging of exhanst gas outlet, the resistance on the way of flue gas is damaged and is reduced, and the power of main exhaust fan can reduce about 10%; Furnace height arranges inconsistent, and flue gas flow and flow velocity reduce, and obvious heat of smoke can make full use of, and the consumption of combustion gas also can save about 5%.
Profile structure of rotary hearth furnace of the present invention, can reduce the content of dirt mud in flue gas, thus improves the grade of the byproduct zinc oxide dust of rotary hearth furnace, and the impurity such as ferric oxide reduce, and purity zinc oxide improves, and the added value of zinc oxide dust improves.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (6)
1. a profile structure of rotary hearth furnace, for the reduction treatment of dirt mud in steel manufacture process, is characterized in that, comprise an annular housing, described annular housing rotates along a pre-determined direction, and described annular housing, according to the flow direction of dirt mud, comprises successively:
Input and output material district, in order to the turnover of dirt mud;
Preheating one district, is heated up by external fuel heat supply, and the flow direction of the flue gas of generation is identical with flowing to of dirt mud;
Reduce 2nd district, heated up by external fuel heat supply, the flow direction of the flue gas of generation is identical with flowing to of dirt mud;
Flue district, comprises exhanst gas outlet, and described exhanst gas outlet is side Horizontal Exit;
Reduce 3rd district, in order to be reduced by the carbon of dirt mud inside, the flow direction of the flue gas of generation is contrary with the flow direction of dirt mud;
Reduce 4th district, in order to be reduced by the carbon of dirt mud inside, the flow direction of the flue gas of generation is contrary with the flow direction of dirt mud;
Wherein, the height of described annular housing is inconsistent, and described in the aspect ratio of the described annular housing at described preheating one district, described reduction two district, place, described flue district, the height of the described annular housing at input and output material district, described reduction three district, place, described reduction four district is high.
2. profile structure of rotary hearth furnace according to claim 1, is characterized in that, the height of the described annular housing at described preheating one district, described reduction two district, place, described flue district is 2.5 meters.
3. profile structure of rotary hearth furnace according to claim 1, is characterized in that, the height of the described annular housing at described input and output material district, described reduction three district, place, described reduction four district is 1.2 meters.
4. profile structure of rotary hearth furnace according to claim 1, is characterized in that, the inner width of described annular housing is 5 meters.
5. profile structure of rotary hearth furnace according to claim 1, is characterized in that, the height of the described annular housing at described preheating one district, place, described reduction two district is maximum.
6. profile structure of rotary hearth furnace according to claim 1, is characterized in that:
Described input and output material district circumferentially accounts for 34 ~ 38 degree at described annular housing;
Described preheating one district circumferentially accounts for 76 ~ 80 degree at described annular housing;
Described reduction two district circumferentially accounts for 70 ~ 74 degree at described annular housing;
Described flue district circumferentially accounts for 22 ~ 26 degree at described annular housing;
Described reduction three district circumferentially accounts for 70 ~ 74 degree at described annular housing;
Described reduction four district circumferentially accounts for 76 ~ 80 degree at described annular housing.
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| CN201310555759.1A CN103591799B (en) | 2013-11-11 | 2013-11-11 | Furnace profile structure of rotary hearth furnace |
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| CN103591799B true CN103591799B (en) | 2015-01-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104197707B (en) * | 2014-09-28 | 2016-01-20 | 中冶南方工程技术有限公司 | Asymmetric rotary hearth furnace discharge zone structure |
| CN106016276A (en) * | 2016-07-01 | 2016-10-12 | 北京神雾环境能源科技集团股份有限公司 | System and method for drying garbage by recycling waste heat of pyrolytic carbon through steam in rotary hearth furnace |
| JP7456762B2 (en) * | 2019-12-10 | 2024-03-27 | 日鉄エンジニアリング株式会社 | Rotary hearth furnace and method for using the same, and method for producing reduced iron-containing products and zinc-containing products |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413041B (en) * | 2007-10-18 | 2010-06-30 | 北京神雾热能技术有限公司 | Coal-based direct reduction iron rotary hearth furnace and combustion method thereof |
| CN102304600B (en) * | 2011-09-14 | 2013-01-30 | 北京科技大学 | Rotary hearth furnace adopting 2-3-section distribution and discharge mode for direct reduction production |
| CN203595392U (en) * | 2013-11-11 | 2014-05-14 | 上海宝钢节能环保技术有限公司 | Furnace-type structure of rotary hearth furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009256746A (en) * | 2008-04-18 | 2009-11-05 | Nippon Steel Engineering Co Ltd | Method for adjusting furnace temperature in heating-combustion zone in rotary-hearth furnace, and rotary-hearth furnace |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413041B (en) * | 2007-10-18 | 2010-06-30 | 北京神雾热能技术有限公司 | Coal-based direct reduction iron rotary hearth furnace and combustion method thereof |
| CN102304600B (en) * | 2011-09-14 | 2013-01-30 | 北京科技大学 | Rotary hearth furnace adopting 2-3-section distribution and discharge mode for direct reduction production |
| CN203595392U (en) * | 2013-11-11 | 2014-05-14 | 上海宝钢节能环保技术有限公司 | Furnace-type structure of rotary hearth furnace |
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| JP特开2009-256746A 2009.11.05 * |
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Address after: 201999 Baoshan District, G Road, Lane No. 550, No. 7, business building, floor 2, level 3, level Applicant after: SHANGHAI BAOSTEEL ENERGY-SAVING ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Address before: 201999, room 1813, 3245 Mudanjiang Road, Shanghai, Baoshan District Applicant before: Shanghai Baosteel Energy Tech Co., Ltd. |
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