CN101413041B - Coal-based direct reduction iron rotary hearth furnace and combustion method thereof - Google Patents
Coal-based direct reduction iron rotary hearth furnace and combustion method thereof Download PDFInfo
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- CN101413041B CN101413041B CN2007101760628A CN200710176062A CN101413041B CN 101413041 B CN101413041 B CN 101413041B CN 2007101760628 A CN2007101760628 A CN 2007101760628A CN 200710176062 A CN200710176062 A CN 200710176062A CN 101413041 B CN101413041 B CN 101413041B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 238000009841 combustion method Methods 0.000 title claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 239000000779 smoke Substances 0.000 claims abstract description 21
- 239000000446 fuel Substances 0.000 claims abstract description 17
- 238000005338 heat storage Methods 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- 238000010304 firing Methods 0.000 abstract 3
- 230000001172 regenerating effect Effects 0.000 abstract 2
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 description 22
- 239000007789 gas Substances 0.000 description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000002829 reductive effect Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 235000009508 confectionery Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Manufacture Of Iron (AREA)
- Tunnel Furnaces (AREA)
Abstract
The invention discloses a coal-based direct reduction iron rotary hearth furnace and a combustion method thereof. The furnace comprises a ring-shaped inner wall and a ring-shaped outer wall, a rotary hearth is arranged between the inner wall and the outer wall, and the inner wall and the outer wall are provided with a plurality of regenerative burners. When the furnace is fired, part of the regenerative burners are fired, and of the left burners are used to discharge smoke; when the preset combustion time is up, the firing burners stop firing and start to discharge smoke, the unfired burners start firing, and the rotation is performed periodically. When the burners discharge smoke, a regenerator absorbs heat so as to lower the temperature of discharged smoke; when the burners are fired, the regenerator releases heat so as to preheat oxidizing air or fuel and increase the combustion temperature. All fuels, of which the thermal values are between 750 and 9000kcal/Nm<3>, can be used, thefurnace temperature and furnace inside atmospheres can meet the process requirements for direct reduction iron.
Description
Technical field
The present invention relates to a kind of kiln technology, relate in particular to a kind of coal-based direct reduction iron rotary hearth furnace and combustion method thereof.
Background technology
Traditional iron-smelting process is that iron ore roasting is become agglomerate or acid pellet, and coking coal refining coke, into blast furnace is put iron ore and coke by reduction reaction acquisition molten iron in the combustion back.Though this technology is very ripe and generally adopt, facility investment is big, complex technical process, energy consumption height, discharges pollutants manyly, and the coking coal of suitable coking more and more is tending towards exhausted.
Direct-reduced iron (sponge iron) can replace the Electric furnace steel making raw material that steel scrap is produced as the short flow process novel process of iron and steel, steel scrap resource scarcity nowadays, and price is more and more expensive, so direct-reduced iron production more and more is subject to people's attention.
Sponge iron production of the prior art has two kinds of methods of gas base reduction method and coal base reduction method.The reductive agent of gas base reduction method adopts Sweet natural gas, and the area that lacks natural gas source is difficult to promote.The coal base reduction method adopts coal or coke as reductive agent, and reductive agent is drawn materials conveniently, is adapted at the natural gas source shortage and the area of rich coal resources is applied.
The main production equipments of coal-based direct reduction iron of the prior art is a rotary hearth furnace, and the important reductive condition of reducing process is the gentle specific reducing atmosphere of blast furnace.In order to reach the furnace temperature more than 1400 ℃, need to adopt high performance fuel, for example Sweet natural gas, liquefied petroleum gas (LPG), heavy oil etc.
There is following shortcoming at least in above-mentioned prior art: fuel value require high, funnel temperature is high, energy dissipation, contaminate environment.
Summary of the invention
The purpose of this invention is to provide a kind of energy-saving and environmental protection, coal-based direct reduction iron rotary hearth furnace and combustion method thereof that temperature of combustion is high.
The objective of the invention is to be achieved through the following technical solutions:
Coal-based direct reduction iron rotary hearth furnace of the present invention comprises the annular inner and outer wall, is provided with rotating furnace bottom between the described inner and outer wall, and described inner and outer wall is respectively equipped with a plurality of heat-accumulating burners, and described heat-accumulating burner is connected with regenerator.
The combustion method of above-mentioned coal-based direct reduction iron rotary hearth furnace of the present invention, in described a plurality of heat-accumulating burners, a part of burner combustion, another part burner are used for smoke evacuation; Burn to preset time, in the cease combustion of incendiary burner, be used for smoke evacuation, unburned burner takes fire, and the line period of going forward side by side by turns.
As seen from the above technical solution provided by the invention, coal-based direct reduction iron rotary hearth furnace of the present invention and combustion method thereof, because the inner and outer wall of rotary hearth furnace is respectively equipped with a plurality of heat-accumulating burners, described heat-accumulating burner is connected with regenerator.In described a plurality of heat-accumulating burner, a part of burner combustion, another part burner are used for smoke evacuation; Burn to preset time, in the cease combustion of incendiary burner, be used for smoke evacuation, unburned burner takes fire, and the line period of going forward side by side by turns.When burner was discharged fume, the regenerator heat absorption reduced funnel temperature; When burner combustion, the regenerator heat release is carried out preheating to combustion air or fuel, improves temperature of combustion.Energy-saving and environmental protection, temperature of combustion height.
Description of drawings
Fig. 1 is the structural representation of coal-based direct reduction iron rotary hearth furnace of the present invention;
Fig. 2 is the state of combustion synoptic diagram of heat-accumulating burner among the present invention.
Embodiment
Coal-based direct reduction iron rotary hearth furnace of the present invention, its preferable embodiment comprises annular inwall 2 and outer wall 3 as shown in Figure 1, is provided with furnace bottom 6 between inwall 2 and the outer wall 3, furnace bottom 6 can rotate, and is respectively equipped with a plurality of heat-accumulating burners 1 on inwall 2 and the outer wall 3.Turning direction along furnace bottom 6 in the rotary hearth furnace is provided with cloth district, preheating reduction section, heating reduction section, high temperature reduction section, control reduction section and discharge zone successively, and cloth district and discharge zone place are provided with opening for feed 5 and discharge port 4 respectively.
A plurality of burners 1 can be provided with on the furnace wall in pairs.Each is in the burner 1, and one is arranged on the inwall 2, and another is arranged on the outer wall 3, also can all be arranged on the outer wall 3 by two burners 1.
As shown in Figure 2, heat-accumulating burner is connected with regenerator, is provided with the heat storage of high temperature ceramic material in the regenerator.
Heat-accumulating burner comprises fuel inlet and gas inlet and outlet, and regenerator is connected with gas inlet and outlet, and regenerator also is connected with gas inlet and exhanst gas outlet.Connect by three-way diverter valve between gas inlet and outlet, gas inlet and the exhanst gas outlet.
Gas inlet can not be connected by three-way diverter valve with exhanst gas outlet yet, but directly is connected respectively on the regenerator, is respectively equipped with independent switching control pilot on gas inlet and the exhanst gas outlet.
The combustion method of above-mentioned coal-based direct reduction iron rotary hearth furnace of the present invention, its preferable embodiment as shown in Figure 2, in a plurality of heat-accumulating burners, a part of burner combustion, another part burner are used for smoke evacuation; Burn to preset time, in the cease combustion of incendiary burner, be used for smoke evacuation, unburned burner takes fire, and the line period of going forward side by side by turns.
Can be on the outer wall 3 of rotary hearth furnace with inwall 2 in relative two burners 1, a burner combustion, another burner are used for smoke evacuation; Burn to preset time, in the cease combustion of incendiary burner, be used for smoke evacuation, unburned burner takes fire, and the line period of going forward side by side by turns.
Also can be in two burners adjacent on the outer wall 3 of rotary hearth furnace, a burner combustion, another burner be used for smoke evacuation; Burn to preset time, in the cease combustion of incendiary burner, be used for smoke evacuation, unburned burner takes fire, and the line period of going forward side by side by turns.
With wherein a pair of burner is example:
Paired burner is divided into the A side and the B side of burner hearth, when fuel and air flow A side burner, during A side burner combustion, airflow has been put aside the heat storage of heat and has been heated to high temperature in burner, and high temperature air participates in burning makes low calorie fuels obtain high theoretical combustion temperature.Meanwhile, the smoke evacuation of B side burner, flue gas heat is absorbed by the heat storage in the B side burner, and the temperature of discharging through heat storage is very low, and waste gas residual heat has obtained abundant recovery.After three-way diverter valve changed the flow direction of working medium, by the heating of the heat storage in the B side burner, A side burner was discharged fume equally for B side burner combustion, air, and flue gas heat is absorbed by the heat storage in the A side burner.So go round and begin again, by this media of heat storage, the waste heat that goes out kiln gas is converted into the physics heat of air, and obtains recycling.Heat storage with enough heat-transfer capabilities and heat storage capacity can make fume afterheat put aside, and the flue gas outflow temperature can be reduced to below 200 ℃, and the accumulative heat is used for the high temperature more than combustion air or the preheating of fuel to 1100 ℃.By the accumulation of heat and the heat release of heat storage, heat recovery rate reaches more than 85%, and temperature efficiency reaches more than 90%.Save energy significantly so not only also declines to a great extent to the pollutent of airborne release, reaches double effects energy-conservation, that reduce discharging.
Direct reduction rotary hearth furnace of the present invention can use calorific value between 750kcal/Nm
3～9000kcal/Nm
3All fuel, particularly low calorie fuels.As easy producer gas (the about 1300kcal/Nm of calorific value that obtains of Steel Plant
3) and blast furnace gas (the about 750kcal/Nm of calorific value
3) wait low-heat value gas.The waste gas residual heat that utilization is discharged from stove is more than combustion air or the preheating of fuel to 1100 ℃, thereby improved the theoretical combustion temperature of low calorie fuels greatly, makes furnace temperature can satisfy 1400 ℃～1500 ℃ processing requirement.
Coal-based direct reduction iron rotary hearth furnace of the present invention compared with prior art has following beneficial effect at least:
(1) temperature of combustion improves, and can satisfy direct reducing process temperature requirement
Use calorific value to be 1300kcal/Nm
3Producer gas when being fuel, the present invention adopts heat accumulating type method air can be preheating to 1100 ℃, furnace temperature can reach 1546 ℃, then satisfies the processing requirement temperature and has a surplus.
In the prior art during not preheating of air furnace temperature can only reach 1198 ℃, do not reach the temperature of arts demand far away; When air adopted ordinary method to be preheating to 450 ℃, furnace temperature can only reach 1330 ℃, does not also reach the temperature of arts demand.
(2) energy-saving effect is remarkable
The present invention adopts the burning of heat accumulating type method, and with preheating of air, the heat utilization efficiency of stove can reach more than 69.3%.
In the prior art, during not preheating of air, the heat utilization efficiency of stove has only 44.3%; When adopting ordinary method preheating of air to 450 ℃, the heat utilization efficiency of stove is 59%.
(3) reduction of discharging amplitude is big
Flue gas reduces discharging amplitude and is directly proportional CO with fuel consumption minimizing amplitude
2Can reduce discharging 17～36.3% Deng gas.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (7)
1. coal-based direct reduction iron rotary hearth furnace, comprise the annular inner and outer wall, be provided with rotating furnace bottom between the described inner and outer wall, it is characterized in that, described inner and outer wall is respectively equipped with a plurality of heat-accumulating burners, and described heat-accumulating burner is connected with regenerator;
Turning direction along described furnace bottom in the described rotary hearth furnace is provided with cloth district, preheating reduction section, heating reduction section, high temperature reduction section, control reduction section and discharge zone successively;
Described heat-accumulating burner comprises fuel inlet and gas inlet and outlet, and described regenerator is connected with described gas inlet and outlet.
2. coal-based direct reduction iron rotary hearth furnace according to claim 1 is characterized in that described regenerator is connected with gas inlet and exhanst gas outlet.
3. coal-based direct reduction iron rotary hearth furnace according to claim 2 is characterized in that, connects by three-way diverter valve between described gas inlet and outlet, gas inlet and the exhanst gas outlet.
4. coal-based direct reduction iron rotary hearth furnace according to claim 3 is characterized in that, is provided with the heat storage of high temperature ceramic material in the described regenerator.
5. the combustion method of each described coal-based direct reduction iron rotary hearth furnace of claim 1 to 4 is characterized in that, in described a plurality of heat-accumulating burners, a part of burner combustion, the gas inlet and outlet of another part burner are used for smoke evacuation; Burn to preset time, in the cease combustion of incendiary burner, its gas inlet and outlet is used for smoke evacuation, and unburned burner takes fire, and the line period of going forward side by side by turns;
The used fuel that burns is that calorific value is 750kcal/Nm
3～9000kcal/Nm
3
6. the combustion method of coal-based direct reduction iron rotary hearth furnace according to claim 5 is characterized in that, on the outer wall of described rotary hearth furnace with inwall in relative two burners, a burner combustion, another burner are used for smoke evacuation; Burn to preset time, in the cease combustion of incendiary burner, be used for smoke evacuation, unburned burner takes fire, and the line period of going forward side by side by turns.
7. the combustion method of coal-based direct reduction iron rotary hearth furnace according to claim 5 is characterized in that, in adjacent two burners, a burner combustion, another burner are used for smoke evacuation on the outer wall of described rotary hearth furnace; Burn to preset time, in the cease combustion of incendiary burner, be used for smoke evacuation, unburned burner takes fire, and the line period of going forward side by side by turns.
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| CN2007101760628A CN101413041B (en) | 2007-10-18 | 2007-10-18 | Coal-based direct reduction iron rotary hearth furnace and combustion method thereof |
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| CN2007101760628A CN101413041B (en) | 2007-10-18 | 2007-10-18 | Coal-based direct reduction iron rotary hearth furnace and combustion method thereof |
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| Publication Number | Publication Date |
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| CN101413041A CN101413041A (en) | 2009-04-22 |
| CN101413041B true CN101413041B (en) | 2010-06-30 |
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Cited By (1)
| 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 |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2013152486A1 (en) * | 2012-04-09 | 2013-10-17 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
| CN102634621A (en) * | 2012-04-09 | 2012-08-15 | 北京神雾环境能源科技集团股份有限公司 | Device and method for treating refractory iron ore |
| CN102766717A (en) * | 2012-08-17 | 2012-11-07 | 北京科技大学 | Method for treating high phosphorus ore by using direct reduction process |
| CN102808059B (en) * | 2012-08-29 | 2014-09-03 | 莱芜钢铁集团有限公司 | Rotary hearth furnace thermal control method for directly reducing carbon-containing pellets |
| CN103148703A (en) * | 2013-03-13 | 2013-06-12 | 莱芜钢铁集团有限公司 | Experimental device for simulating reduction of rotary hearth furnace |
| CN106403591A (en) * | 2016-11-22 | 2017-02-15 | 江苏省冶金设计院有限公司 | Rotary hearth furnace with hollow retaining wall |
| CN113091452A (en) * | 2021-04-14 | 2021-07-09 | 中冶赛迪技术研究中心有限公司 | Configuration method of combustion system of rotary hearth furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273277A (en) * | 1999-05-06 | 2000-11-15 | 株式会社神户制钢所 | Direct reduction method and rotary kiln hearth |
| CN1653196A (en) * | 2002-05-31 | 2005-08-10 | 新日本制铁株式会社 | Furnace side wall structure of rotary hearth furnace |
-
2007
- 2007-10-18 CN CN2007101760628A patent/CN101413041B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273277A (en) * | 1999-05-06 | 2000-11-15 | 株式会社神户制钢所 | Direct reduction method and rotary kiln hearth |
| CN1653196A (en) * | 2002-05-31 | 2005-08-10 | 新日本制铁株式会社 | Furnace side wall structure of rotary hearth furnace |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平6-193860A 1994.07.15 |
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 |
| 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 |
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| CN101413041A (en) | 2009-04-22 |
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