CN102010918A - Environmental-friendly energy-saving blast-furnace oxygen ironmaking method - Google Patents
Environmental-friendly energy-saving blast-furnace oxygen ironmaking method Download PDFInfo
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- CN102010918A CN102010918A CN2010105912424A CN201010591242A CN102010918A CN 102010918 A CN102010918 A CN 102010918A CN 2010105912424 A CN2010105912424 A CN 2010105912424A CN 201010591242 A CN201010591242 A CN 201010591242A CN 102010918 A CN102010918 A CN 102010918A
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Abstract
The invention provides an environmental-friendly energy-saving blast-furnace oxygen ironmaking method which is as follows: oxygen is delivered to a blast furnace which is used for replacing an original blast-furnace hot blast stove system to finish blast-furnace ironmaking. In the blast furnace, the oxygen reacts with coals to generate a reducing agent which chemically reacts with iron ores, so that iron oxides in the iron ores are reduced to metal irons, simultaneously the released heat is used as main heat of the blast furnace, and a small amount of cokes is used for providing parts of heat for the blast furnace and playing a ventilation role in stock columns and a gasifying carburetion role in cast irons; and coal gas on the top of the blast furnace is led in the blast furnace for regulating the temperature of the blast furnace, and simultaneously CO2 and H2O in the coal gas are converted into CO and H2 reducing agents, thereby realizing recycle. By using the method, the equipment cost is saved, and the energy consumption and discharge of carbon dioxide are reduced, thus being environmental-friendly, effectively reducing the production cost, and improving the economic benefits.
Description
Technical field
The present invention relates to a kind of iron smelting method, particularly a kind of environmental protection and energy saving blast furnace oxygen steelmaking method.
Background technology
Usually, the normal method that adopts of ironmaking has two kinds, the one, blast-furnace iron-making method, it mainly is to adopt blast furnace and connected feeding device and blast-furnace hot-air furnace system, by feeding device iron ore, coke, flux are constantly packed into from blast furnace roof, and be blown in the blast furnace through about 1000-1400 ℃ hot-air of the blast funnace hot blast stove preheating air port from bottom house, at high temperature the coke in the blast furnace generates CO and H with the preheating air combustion that blasts
2, this CO and H
2As reducing agent, at high temperature with iron ore generation chemical reaction, with the ferriferous oxide in the iron ore such as Fe
3o
4, Fe
2o
3, Feo etc. is reduced into the metal molten iron, and discharges from blast furnace iron notch, coal gas is derived from blast furnace roof, after dedusting, about 45% is used for blast funnace hot blast stove adds hot-air, and all the other are employed as industrial coal gas, and the slag that generates is discharged from the tap cinder mouth, refines one ton of molten iron and approximately needs the 500Kg coke.Though this iron smelting method technico-economical comparison is good, technology is simple, turnout is big, the efficient height, but, the hot blast that offers blast furnace is through pressurization, the air of heating, and useful oxygen accounts for less than 21% in the air, and when oxygen-enriched coal spray, add 3% oxygen again, the two adds up only 24%, that is to say that the energy consumption that accounts for about 76% nitrogen there is no need, and has been wasted in the process of about 0.45Mpa and about 1000-1400 ℃ of heating to air pressurized, cause energy dissipation, and, also can therefore increase pipeline, valve, container, the expense of utility appliance such as thermal insulation material and material causes infusion of financial resources more.Moreover, owing to the hot blast of blast funnace hot blast stove is to rely on the blast furnace gas of burning about 45% to obtain, and each blast furnace need be equipped with several hotblast stoves, this not only can waste a large amount of coal gas, also cost height, maintenance cost are also higher, and smelt one ton of iron and approximately need the 500Kg coke, with main thermal source and the reductive agent of coke, not only make cost high but also environment is caused very big pollution as blast furnace.Another kind is non-blast furnace process, and this method is to adopt coal-based direct reduction iron Technology and equipment, and it is compared with blast furnace process at aspects such as cost, energy consumption, quality and scales, still exists certain deficiency, and gap is in various degree arranged.
Summary of the invention
The object of the present invention is to provide a kind of environmental protection and energy saving blast-furnace oxygen ironmaking method, it can overcome the deficiency of prior art, can directly blow into oxygen in blast furnace, and oxygen generates high temperature reduction agent CO and H with coal and coke generation chemical reaction in blast furnace
2, and with iron ore generation chemical reaction, the reduction of ferrous oxide in the iron ore is become metallic iron, can effectively reduce the equipment investment expense and reduce toxic emission, can cut down the consumption of energy again and production cost, can increase economic efficiency.
Iron smelting method of the present invention is: by the feeding device that is connected with blast furnace iron-smelting raw material iron ore, coal, coke and the flux charging aperture from Top of BF is added in the blast furnace, by the oxygen channel that is connected with blast furnace the air inlet of oxygen from bottom house is blown in the blast furnace simultaneously, the coal in oxygen and the blast furnace and coke generation chemical reaction generate CO, H
2The high-temperature combustible gas body, as the high temperature reduction agent, liberated heat is as the main heat of blast furnace simultaneously.And high temperature reduction agent CO, H
2With the iron ore generation chemical reaction in the blast furnace, with the ferriferous oxide Fe in the iron ore
3o
4, Fe
2o
3, Feo etc. restores, generate molten iron, and after the coke Carburization Treatment in blast furnace, discharge from blast furnace iron notch.And the blast furnace gas pipeline of the coal gas of blast furnace roof through being connected with blast furnace imports in the blast furnace again, is used for regulating the temperature in the blast furnace, and simultaneously a large amount of CO in this coal gas
2And H
2O resolves into CO and H
2Reducing agent, cycling and reutilization, slag is discharged from the tap cinder mouth.Described iron ore is sintered ore or pelletizing ore or lump ore stone etc.; Described flux is lime stone or dolomite or fluorite etc.
The present invention adopts technique scheme, utilization is sent oxygen to blast furnace, replace prior art blast-furnace hot-air furnace system to finish blast furnace ironmaking, can save the energy consumption of the investment cost of blast funnace hot blast stove system device such as air pressurization system, hotblast stove and inner filler, switching valve and pipe network system, control system equipment expense and pressurized, heated thereof, thereby make more terse, the energy-saving and environmental protection of blast furnace ironmaking; Utilize oxygen and coal and coke generation chemical reaction to generate pyritous CO, H
2Reductive agent, iron ore generation chemical reaction directly and in the blast furnace, ferriferous oxide in the iron ore is reduced into molten iron, and carry out discharging after the carburizing treatment with a spot of coke, and the coal gas of blast furnace furnace roof imports and is recycled in the blast furnace, the one, be used to regulate the temperature in the blast furnace, the 2nd, simultaneously with CO a large amount of in the coal gas
2And H
2O resolves into CO and H
2Reductive agent like this, can reduce CO effectively
2Discharging, make CO
2Obtain decomposing and utilize, not only energy-saving and cost-reducing but also can reduce discharging, help environmental protection.And the heat that the required main heat of blast furnace produces from oxygen and coal generation chemical reaction, and adopt the ratio of coke few, refining one ton of iron only needs about coke 50Kg, and these a small amount of coke only are used for providing the part heat to blast furnace, and rises to the ventilative of stock column with to the carburization of the pig iron.In a word, utilize low-cost coal to replace most of coke to provide heat and high temperature reduction agent to blast furnace; Blast-furnace hot-air furnace system with in the oxygen replacement prior art can effectively reduce equipment investment, reduce production costs, and increases economic efficiency.If employing the inventive method is carried out energy-conservation, synergy to the very big iron-smelting blast furnace of present usage quantity and improved, not only potentiality are very big, and energy-conservation, the consumption reduction risk is also very low, and meets the policy of present energy-conservation, reduction of discharging, environmental protection.
Description of drawings
Accompanying drawing is a kind of process flow sheet of environmental protection and energy saving blast furnace oxygen steelmaking method.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
With reference to accompanying drawing, the present invention adopts blast furnace and connected feeding device, and the oxygen channel that is connected with blast furnace air inlet and the blast furnace gas pipeline smelting equipment that forms and smelting iron.Its production method is: will measure according to the rules iron ore, coal, coke and the flux of weighing, add in the blast furnace by the charging aperture of feeding device from blast furnace roof, simultaneously oxygen is blown in the blast furnace by the air inlet of oxygen channel from bottom house, make the Coal and coke in oxygen and the blast furnace carry out chemical reaction, generate CO, H
2The high-temperature combustible gas body, as the high temperature reduction agent, and during chemical reaction liberated heat as the main heat of blast furnace.In blast furnace, high temperature reduction agent CO and H
2With iron ore generation chemical reaction, with the ferriferous oxide Fe in the iron ore
3o
4, Fe
2o
3, Feo restores, generate molten iron, and after the coke carburizing, discharge from blast furnace iron notch.In the process of stating reaction of going to school, top gas imports in the blast furnace by blast furnace gas pipeline again, is used to regulate the temperature in the blast furnace, and simultaneously a large amount of CO in the coal gas
2And H
2Thermal endothermic decomposition becomes CO and H in the high temperature of O in blast furnace
2Reductive agent, cycling and reutilization.And slag is discharged from the tap cinder mouth.Described iron ore is sintered ore or pelletizing ore or lump ore stone etc.Described flux is lime stone or dolomite or fluorite etc., can make slag turn to liquid, removes harmful element sulphur.Smelting one ton of iron only needs a small amount of coke of 50Kg, these coke except with oxygen reaction for providing in the blast furnace the part heat, also be used for the ventilative of stock column and the pig iron played carburization, to guarantee iron, the Carbon balance in the pig iron, can guarantee product quality.
Claims (1)
1. environmental protection and energy saving blast-furnace oxygen ironmaking method, it is characterized in that, by feeding device material iron ore, coal, coke and the flux of the ormal weight charging aperture from Top of BF is added in the blast furnace, by oxygen channel the air inlet of oxygen from bottom house is blown in the blast furnace simultaneously, in blast furnace, oxygen and Coal and coke generation chemical reaction generate CO and H
2The high-temperature combustible gas body, as the high temperature reduction agent, during chemical reactions at the same time liberated heat as the main heat of blast furnace, and high temperature reduction agent CO and H
2With the iron ore generation chemical reaction in the blast furnace, with the ferriferous oxide Fe in the iron ore
3o
4, Fe
2o
3, Feo restores, and generates molten iron, and after the coke Carburization Treatment, discharge from blast furnace iron notch, and the coal gas of blast furnace roof imports in the blast furnace through blast furnace gas pipeline again, is used for regulating the temperature in the blast furnace, and simultaneously a large amount of CO in the coal gas
2And H
2O resolves into CO and H
2Reducing agent, cycling and reutilization, slag is discharged from the tap cinder mouth, and described iron ore is sintered ore or pelletizing ore or lump ore stone, and described flux is lime stone or dolomite or fluorite.
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| CN2010105912424A CN102010918A (en) | 2010-12-11 | 2010-12-11 | Environmental-friendly energy-saving blast-furnace oxygen ironmaking method |
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| CN2010105912424A CN102010918A (en) | 2010-12-11 | 2010-12-11 | Environmental-friendly energy-saving blast-furnace oxygen ironmaking method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020083A (en) * | 2019-12-16 | 2020-04-17 | 王立臣 | Novel pure oxygen smelting furnace and use method thereof |
| CN112662824A (en) * | 2020-12-18 | 2021-04-16 | 昆明理工大学 | Blast furnace hydrogen-rich smelting process for efficiently utilizing metallurgical waste gas |
| CN113151622A (en) * | 2021-04-13 | 2021-07-23 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN114134268A (en) * | 2021-10-26 | 2022-03-04 | 中冶南方工程技术有限公司 | Blast furnace iron-making method utilizing top gas circulation |
| CN114959148A (en) * | 2022-05-25 | 2022-08-30 | 刘绍祥 | Electric furnace iron-making method |
| WO2023134369A1 (en) * | 2022-01-12 | 2023-07-20 | 新疆八一钢铁股份有限公司 | Oxygen enrichment blast-furnace blow in method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555532A (en) * | 2009-05-22 | 2009-10-14 | 北京科技大学 | Oxygen blast furnace iron-making method based on cold-bonded carbonic pellet |
| CN101831517A (en) * | 2010-05-26 | 2010-09-15 | 王林 | Blast furnace coal gasification air heating furnace smelting method |
-
2010
- 2010-12-11 CN CN2010105912424A patent/CN102010918A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101555532A (en) * | 2009-05-22 | 2009-10-14 | 北京科技大学 | Oxygen blast furnace iron-making method based on cold-bonded carbonic pellet |
| CN101831517A (en) * | 2010-05-26 | 2010-09-15 | 王林 | Blast furnace coal gasification air heating furnace smelting method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020083A (en) * | 2019-12-16 | 2020-04-17 | 王立臣 | Novel pure oxygen smelting furnace and use method thereof |
| CN111020083B (en) * | 2019-12-16 | 2021-08-06 | 王立臣 | Pure oxygen smelting furnace and using method thereof |
| CN112662824A (en) * | 2020-12-18 | 2021-04-16 | 昆明理工大学 | Blast furnace hydrogen-rich smelting process for efficiently utilizing metallurgical waste gas |
| CN113151622A (en) * | 2021-04-13 | 2021-07-23 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN113151622B (en) * | 2021-04-13 | 2022-04-01 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN114134268A (en) * | 2021-10-26 | 2022-03-04 | 中冶南方工程技术有限公司 | Blast furnace iron-making method utilizing top gas circulation |
| WO2023134369A1 (en) * | 2022-01-12 | 2023-07-20 | 新疆八一钢铁股份有限公司 | Oxygen enrichment blast-furnace blow in method |
| CN114959148A (en) * | 2022-05-25 | 2022-08-30 | 刘绍祥 | Electric furnace iron-making method |
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