CN103591799A - Furnace profile structure of rotary hearth furnace - Google Patents
Furnace profile structure of rotary hearth furnace Download PDFInfo
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- CN103591799A CN103591799A CN201310555759.1A CN201310555759A CN103591799A CN 103591799 A CN103591799 A CN 103591799A CN 201310555759 A CN201310555759 A CN 201310555759A CN 103591799 A CN103591799 A CN 103591799A
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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 manufacturing equipment field, particularly a kind of furnace type structure of rotary hearth furnace.
Background technology
Iron and steel enterprise's every production 1t steel will produce the dirt mud of 100kg left and right, in the dirt mud of 30% left and right, contains the harmful elements such as zinc, potassium, sodium.By adopting the Direct Reduction Technology of rotary hearth furnace, can effectively above-mentioned harmful element be reclaimed and is used, therefore obtained the great attention of domestic and international iron and steel enterprise.
From domestic and international rotary hearth furnace ruuning situation, the greatest problem of existence is that waste heat boiler and heat exchanger stop up.In rotary hearth furnace production process, flue dust generation is larger, and the rotary hearth furnace of processing 20Wan t iron and steel enterprise dirt mud a year is disposed to flue gas approximately 150,000 m of 200 ℃, sack cleaner end
3/ h.Therefore large exhaust gas volumn flow velocity certainly will be taken away greatly the dirt mud particle on more pelletizings surface, increases follow-up waste heat boiler and heat exchanger and stops up Probability.
Domestic and international existing rotary hearth furnace is annular contour cavity, charging and discharging keep the angle of 15 ° of left and right, at feed side, it is exhanst gas outlet, angle with approximately 30 ° of left and right of charging aperture, make material stream and smoke gas flow reverse movement, make full use of the sensible heat of flue gas, but flue gas range ability strengthens simultaneously, flow velocity increases, and the solid dust of taking away in flue gas increases; The anxious heat of high temperature makes the explosion of dirt mud increase Dust Capacity in addition, affects the heat exchange efficiency of follow-up waste heat boiler and heat exchanger.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of rotary hearth furnace type of furnace structure is provided, reached the technique effect that reduces the dirt mud amount in flue gas.
The present invention is achieved through the following technical solutions:
A type of furnace structure, processes for the reduction of steel manufacture process dirt mud, comprises an annular housing, and annular housing rotates along a predetermined 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, heats 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, by external fuel heat supply, heat up, 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 the carbon by dirt mud inside, reduce, the flow direction of the flue gas of generation is contrary with the flow direction of dirt mud;
Reduce 4th district, in order to the carbon by dirt mud inside, reduce, 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, the height of annular housing at 2nd district, place, flue district of reducing are 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 accounts for 34 ~ 38 degree on the circumference of annular housing; Preheating one district accounts for 76～80 degree on the circumference of annular housing; Reduce 2nd district on the circumference of annular housing, account for 70 ~ 74 degree; Flue district accounts for 22 ~ 26 degree on the circumference of annular housing; Reduce 3rd district on the circumference of annular housing, account for 70 ~ 74 degree; Reduce 4th district on the circumference of annular housing, account for 76～80 degree.
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.
The specific embodiment
Below with reference to accompanying drawing of the present invention; technical scheme in the embodiment of the present invention is carried out to clear, complete description and discussion; obviously; as described herein is only a part of example of the present invention; it is not whole examples; embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, below in conjunction with accompanying drawing, take specific embodiment and be further explained as example, and each embodiment does not form the restriction to the embodiment of the present invention.
Please refer to Fig. 1, a kind of rotary hearth furnace type of furnace structure 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 76 °～80 ° of whole circumference (in the present embodiment successively 36 °, Shi Yi input and output material district, 78 °, preheating one district, reduce two 24 °, 72°, flue districts, district, reduce 72 °, 3rd district, to reduce 78 °, 4th district be example, but the present invention does not limit at this).The height of annular housing is inconsistent, preheating one district 2, reduce two districts 3,4 places, flue district annular housing aspect ratio input and output material district 1, to reduce three districts 5, the height of annular housing at 6 places, 4th districts of reducing high.
In the present embodiment, the burner hearth inner width of rotary hearth furnace is 5 meters (the width in six regions is all 5 meters), preheating one district 2, to reduce two districts 3, flue district 4 burner hearth inner heights 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 height in the burner hearth inner width He Ge district of rotary hearth furnace at this, it is not limited, technical staff can be according to actual conditions adjustment).The exhanst gas outlet in flue district 4 is side outlet.
Please refer to Fig. 2 to Fig. 6, for the ease of technical staff, understand operation principle of the present invention, below workflow of the present invention is introduced:
Please refer to Fig. 2, first by special equipment, in input and output material district, add dirt mud, the number of plies of pelletizing is adjusted according to the size of itself, generally arranges one deck half; Please refer to Fig. 3, dirt mud, at preheating one district and reduction two district's heating reductions, is mainly that pelletizing surface high-temp reduces fixed be full of cracks; Please refer to Fig. 4, flue gas collects in flue district, by horizontal flue, enters vertical gas pass, the air after-flame that in flue gas, a small amount of CO passes into by vertical gas pass; Please refer to Fig. 5, in reduction 3rd district and reduction 4th district, dirt mud inside under high temperature discharges CO by the direct-reduction of carbon, CO is in burner hearth internal combustion, simultaneously flue gas stream brings to reduction three district by temperature from reducing 4th district against pelletizing traffic direction, reduced the supply of fuel, 0.6～0.8 times of red heat pelletizing volume-diminished; Please refer to Fig. 6, the red heat pelletizing of approximately 1100 ℃ is discharged 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 has reduced dust content in flue gas.This region burner hearth is low in addition, is convenient to the maintenance of feed arrangement and discharging spiral.
2, preheating one district, the two district furnace heights that reduce are maximum because in this region mainly the heat supply by external fuel pelletizing is heated up, therefore need larger combustion space, also can avoid thermal current to 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, alleviates 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, reduce 4th district be ，Gai region, high temperature reduction district mainly the carbon of the inside by pelletizing reduce, furnace height reduces, can keep higher fire box temperature, reduce the heat supply of external fuel, reduce the consumption of coal gas, final exhaust gas volumn reduces.Because flue gas reduces to the distance exporting, the Dust Capacity that the flue gas of the less flow of lower flow velocity is taken away reduces greatly again.In the flow direction of this region flue gas and the flow direction of material, be contrary, can utilize the waste heat of high-temperature flue gas, has now reduced substantially on dirt mud surface, has formed hard appearance, and less exhaust gas volumn has not formed the impact of washing away on sludge pellet.
5, for preventing the anxious thermal spalling of pelletizing, existing rotary hearth furnace preheating zone temperature is generally below 900 ℃, and exhanst gas outlet is located at preheating zone, because the gasification temperature of zinc is 906 ℃ of left and right, and the resistance to material enrichment of the burner hearth of zinc oxide in preheating zone.Exhanst gas outlet of the present invention is arranged on reduction 2nd district and reducing between 3rd district, reduce 3rd district, to reduce 4th district be high-temperature region, in flue gas, zinc content is maximum, and the large flue gas of zinc content directly discharges without reduction 2nd district and preheating one district.Can significantly increase the service life of the resistance to material of burner hearth.
6, due to the centre position that is 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 approximately 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 be saved 5% left and right.
Rotary hearth furnace type of furnace structure of the present invention, can reduce the content of dirt mud in flue gas, thereby improves the grade of the byproduct zinc oxide dust of rotary hearth furnace, and the impurity such as iron oxide reduce, and zinc oxide purity improves, and the added value of zinc oxide dust improves.
The above; be only the present invention's specific embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in 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 rotary hearth furnace type of furnace structure, processes for the reduction of steel manufacture process dirt mud, it is characterized in that, comprise an annular housing, described annular housing rotates along a predetermined 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, heats 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, by external fuel heat supply, heat up, 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 the carbon by dirt mud inside, reduce, the flow direction of the flue gas of generation is contrary with the flow direction of dirt mud;
Reduce 4th district, in order to the carbon by dirt mud inside, reduce, 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 the height of the described annular housing at input and output material district, described reduction 3rd district, described reduction four places, district is high described in the aspect ratio of the described annular housing at described preheating one district, described reduction 2nd district, place, described flue district.
2. rotary hearth furnace type of furnace structure according to claim 1, is characterized in that, the height of the described annular housing at described preheating one district, described reduction 2nd district, place, described flue district is 2.5 meters.
3. rotary hearth furnace type of furnace structure according to claim 1, is characterized in that, the height of the described annular housing at described input and output material district, described reduction 3rd district, described reduction four places, district is 1.2 meters.
4. rotary hearth furnace type of furnace structure according to claim 1, is characterized in that, the inner width of described annular housing is 5 meters.
5. rotary hearth furnace type of furnace structure according to claim 1, is characterized in that, the height of the described annular housing at described preheating one district, described reduction two places, district is maximum.
6. rotary hearth furnace type of furnace structure according to claim 1, is characterized in that:
Described input and output material district accounts for 34 ~ 38 degree on the circumference of described annular housing;
Described preheating one district accounts for 76 ~ 80 degree on the circumference of described annular housing;
Described reduction 2nd district account for 70 ~ 74 degree on the circumference of described annular housing;
Described flue district accounts for 22 ~ 26 degree on the circumference of described annular housing;
Described reduction 3rd district account for 70 ~ 74 degree on the circumference of described annular housing;
Described reduction 4th district account for 76 ~ 80 degree on the circumference of described annular housing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197707A (en) * | 2014-09-28 | 2014-12-10 | 中冶南方工程技术有限公司 | Asymmetrical material discharging area structure for rotary hearth furnace |
| 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 |
| CN112322819A (en) * | 2019-12-10 | 2021-02-05 | 日铁工程技术株式会社 | Rotary hearth furnace, method for using same, and method for producing reduced iron-containing material and zinc-containing material |
Citations (4)
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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 |
| 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 for 2~3 stages of distribution and discharge of direct reduction production method |
| 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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2013
- 2013-11-11 CN CN201310555759.1A patent/CN103591799B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN102304600B (en) * | 2011-09-14 | 2013-01-30 | 北京科技大学 | Rotary Hearth Furnace for 2~3 stages of distribution and discharge of direct reduction production method |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197707A (en) * | 2014-09-28 | 2014-12-10 | 中冶南方工程技术有限公司 | Asymmetrical material discharging area structure for rotary hearth furnace |
| 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 |
| CN112322819A (en) * | 2019-12-10 | 2021-02-05 | 日铁工程技术株式会社 | Rotary hearth furnace, method for using same, and method for producing reduced iron-containing material and zinc-containing material |
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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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