CN203595392U - Furnace-type structure of rotary hearth furnace - Google Patents
Furnace-type structure of rotary hearth furnace Download PDFInfo
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- CN203595392U CN203595392U CN201320707192.0U CN201320707192U CN203595392U CN 203595392 U CN203595392 U CN 203595392U CN 201320707192 U CN201320707192 U CN 201320707192U CN 203595392 U CN203595392 U CN 203595392U
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Abstract
A furnace-type 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 in the flow direction of dust. The flow direction of flue gas generated in the first preheating area is the same as the flow direction of the dust. The flow direction of flue gas generated in the second reduction area is the same as the flow direction of the dust. A flue gas outlet of the flue area is a lateral horizontal outlet. The flow direction of flue gas generated in the third reduction area is opposite to the flow direction of the dust. The flow direction of flue gas generated in the fourth reduction area is opposite to the flow direction of the dust. The height of the annular cavity is not uniform, the part, where the first preheating area, the second reduction area and the flue area are located, of the annular cavity is higher than the part, where the third reduction area and the fourth reduction area are located, of the annular cavity.
Description
Technical field
The utility model 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 obtain 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 200,000 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, be exhanst gas outlet at feed side, 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.
Utility model content
The utility model, for prior art above shortcomings, provides a kind of rotary hearth furnace type of furnace structure, has reached the technique effect that reduces the dirt mud amount in flue gas.
The utility model is achieved through the following technical solutions:
A kind of rotary hearth furnace type of furnace structure, for the reduction processing 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, heat 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 reduce 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 reduce 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, and the height of the annular housing at the aspect ratio input and output material district of the annular housing at preheating one district, reduction 2nd district, place, flue district, reduction 3rd district, reduction four places, district is high.
Preferably, the height of the annular housing at preheating one district, reduction 2nd district, place, flue district is 2.5 meters.
Preferably, the height of the annular housing at input and output material district, reduction 3rd district, reduction four places, district is 1.2 meters.
Preferably, the inner width of annular housing is 5 meters.
Preferably, the height maximum of the annular housing at preheating one district, reduction two places, district.
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 utility model;
Shown in Fig. 2 to Fig. 6 is workflow exploded view of the present utility model.
The specific embodiment
Below with reference to accompanying drawing of the present utility model; technical scheme in the utility model embodiment is carried out to clear, complete description and discussion; obviously; as described herein is only a part of example of the present utility model; it is not whole examples; based on the embodiment in the utility model, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to protection domain of the present utility model.
For the ease of the understanding to the utility model embodiment, be further explained as an example of specific embodiment example below in conjunction with accompanying drawing, and each embodiment does not form the restriction to the utility model embodiment.
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, is respectively input and output material district 1, preheating one district 2, reduction two districts 3, flue district 4, reduction three districts 5, reduction 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 (be successively in the present embodiment take input and output material district 78 ° of 36 °, 78 °, preheating one district, 72 °, 2nd district of reduction, 24 °, flue district, 72 °, 3rd district of reduction, reduction 4th district as example, but the utility model does not limit at this).The height of annular housing is inconsistent, and the height of the annular housing at the aspect ratio input and output material district 1 of the annular housing at preheating one district 2, reduction two districts 3,4 places, flue district, reduction three districts 5, reduction 6 places, 4th districts is 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, reduction two districts 3, flue district 4 burner hearth inner heights are 2.5 meters, reduce three districts 5, reduction four districts 6 and input and output material district 1 burner hearth inner height be 1.2 meters (the utility model this just the height in the burner hearth inner width He Ge district to rotary hearth furnace illustrate, 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, understand operation principle of the present utility model for the ease of technical staff, below workflow of the present utility model 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 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, enters vertical gas pass by horizontal flue, 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 at stove chamber inner combustion, simultaneously flue gas stream brings to reduction three district by temperature from reducing 4th district against pelletizing traffic direction, reduce 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 utility model 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, reduction two district's furnace height maximums, because mainly pelletizing is heated up by the heat supply of external fuel in this region, therefore need larger combustion space, also can avoid thermal current to sludge pellet disturbance, reduces 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, reduction 3rd district, reduction 4th district are high temperature reduction district, and in this region, mainly the carbon of the inside by pelletizing reduces, and 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 of outlet, the Dust Capacity that the flue gas of the less flow of lower flow velocity is taken away reduces greatly again.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, 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.The utility model exhanst gas outlet is arranged between reduction 2nd district and reduction 3rd district, and reduction 3rd district, reduction 4th district are high-temperature region, zinc content maximum in flue gas, 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 utility model, 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; it is only the preferably specific embodiment of the utility model; but protection domain of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (6)
1. a rotary hearth furnace type of furnace structure, for the reduction processing of steel manufacture process dirt mud, 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, heat 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 reduce 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 reduce 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 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 maximum of the described annular housing at described preheating one district, described reduction two places, district.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320707192.0U CN203595392U (en) | 2013-11-11 | 2013-11-11 | Furnace-type structure of rotary hearth furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320707192.0U CN203595392U (en) | 2013-11-11 | 2013-11-11 | Furnace-type structure of rotary hearth furnace |
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| CN203595392U true CN203595392U (en) | 2014-05-14 |
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| CN201320707192.0U Withdrawn - After Issue CN203595392U (en) | 2013-11-11 | 2013-11-11 | Furnace-type structure of rotary hearth furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591799A (en) * | 2013-11-11 | 2014-02-19 | 上海宝钢节能技术有限公司 | Furnace profile structure of 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 |
-
2013
- 2013-11-11 CN CN201320707192.0U patent/CN203595392U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591799A (en) * | 2013-11-11 | 2014-02-19 | 上海宝钢节能技术有限公司 | Furnace profile structure of rotary hearth furnace |
| CN103591799B (en) * | 2013-11-11 | 2015-01-14 | 上海宝钢节能环保技术有限公司 | Furnace profile structure of 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140514 Effective date of abandoning: 20150114 |
|
| RGAV | Abandon patent right to avoid regrant |