KR20100082696A - Process for making iron in a blast furnace and use of top gas resulting from said process - Google Patents
Process for making iron in a blast furnace and use of top gas resulting from said process Download PDFInfo
- Publication number
- KR20100082696A KR20100082696A KR1020090026285A KR20090026285A KR20100082696A KR 20100082696 A KR20100082696 A KR 20100082696A KR 1020090026285 A KR1020090026285 A KR 1020090026285A KR 20090026285 A KR20090026285 A KR 20090026285A KR 20100082696 A KR20100082696 A KR 20100082696A
- Authority
- KR
- South Korea
- Prior art keywords
- iron
- furnace
- injected
- fuel
- gas
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
The present invention relates to a method for producing iron in a furnace and a method for using the upper gas of a furnace obtained from this production method as a fuel for a power plant, in particular a combined cycle power plant.
The top gas obtained from traditional furnace processes is a relatively low calorific gas which is in most cases treated and treated as a byproduct. Some of the top gas can be used to heat the hot blast for the furnace, and the remainder is used for applications requiring low calorific value gas but is sometimes burned as waste gas.
However, burning the top gas does not apply in all cases. According to the known method, this low calorific value overhead gas is mixed with a gas having a high calorific value such as natural gas to be suitable for use in a power plant for generating electricity and steam.
According to a recent development, a power plant is for example a coke oven and / or after a cleaning and mixed top gas is supplied to a multi-cycle power plant for producing electricity, in particular a gas turbine designed for low calorific value synthesis gas. Or near the steel mill of Silva Steelworks, Taranto, Italy, mixed with the gas from the oxygen steelmaking furnace. These devices, operating on low calorific gas, are suitable for known integrated gasification combined cycles in which syngas is used for the gasification of coal or waste materials. In all these devices, certain gas turbines are used to design for low calorific gas. Because of the efficiency of the combined cycle technology, it is economically installed in power plants.
It is an object of the present invention to provide a method for producing iron in a furnace with increased iron production by improving productivity.
Another object of the present invention is to provide a method for producing iron in a furnace for obtaining a top gas having a high calorific value.
Another object of the present invention is to provide a method for manufacturing iron in a furnace that can easily control the calorific value of the upper gas.
It is a further object of the present invention to use the top gas as fuel for a power plant, more preferably a combined cycle power plant.
One or more of these purposes
In the iron manufacturing method in the furnace,
Providing iron ore and coke in the furnace,
Blasting at the bottom of the furnace,
Injecting fuel into the bottom of the furnace,
Combusting coke and fuel with a blower to provide heat to the melt and produce molten iron,
The oxygen content of the blow is 30-100% by volume and the amount of fuel injected is achieved by being in the range of 220-500 kg per ton of hot metal.
Increasing the calorific value of the upper gas by injecting oxygen with blowing air of 30-100% by volume and injecting a predetermined amount of fuel at the same time. At the same time, the total tonnage of the produced hot metal is increased. The high calorific value top gas obtained from the production process according to the invention does not need to mix this gas with other gases and can be supplied directly to the combined cycle power plant after purification. In this way, very effective combined operation of the furnace and combined cycle power plant is achieved.
According to another aspect of the present invention, the oxygen content of the blowing is preferably from 30 to 70% by volume, more preferably from 35 to 70% by volume.
The oxygen content of 30% by volume is the lowest content, which is high enough to make it possible to use the top gas in the power plant without mixing this gas with other gases with high calorific value such as natural gas or coke-oven gas. It is possible to produce the upper gas having. For this reason, it is preferable that the lower limit is 35 vol% oxygen content to ensure that the top gas having a high calorific value is generated so that the power plant can be operated without special measurement.
Blowing with a 100% by volume oxygen content produces a top gas with a sufficiently high calorific value, but the furnace process will be inefficient. Too much oxygen in the blow means little or no nitrogen in the blow. Since nitrogen acts as a heat transfer medium for transferring heat from the bottom to the top of the furnace, it is preferable to have a predetermined amount of nitrogen in the blower. Too little nitrogen in the furnace leads to inadequate preheating and pre-reduction material, which in turn reduces the efficiency of the furnace. This heat transfer problem can also be solved by injecting heated gas into the top stack of the furnace to achieve the desired heat balance, but using less than 100% oxygen and achieving sufficient heat transfer by the desired nitrogen content desirable.
According to another aspect of the invention, a portion of the oxygen is injected as a cold blast. Since it is difficult to inject hot air having a very high oxygen content, at least a part of the oxygen can be injected into the cold wind when a high oxygen level is required to realize the upper gas having a predetermined calorific value.
A second feature of the process of the invention is the high proportion of injected fuel. Various fuels of various types, such as coal, gas, oil, etc., injected through a tuyere for injecting hot air into the furnace may be used. In the production method according to the present invention, at least 250 kg of fuel per ton of molten metal is injected to realize a top gas having a desired minimum calorific value. Depending on the fuel quality and the operating environment, the fuel injection ranges from 300-400 kg per tonne of melt or 350-400 kg per tonne. The production method according to the invention focuses on conditions in raceways, flocculation zones and furnace stacks to allow gasification and to effectively use large amounts of fuel in the furnace without letting gas out through the top.
According to another aspect of the invention, burnt lime is injected at the time of manufacture. The injection of quicklime achieves a low liquidus temperature of the primary slag, which results in easier discharge of the slag into the hearth of the furnace, thus reducing the pressure difference in the furnace. Quicklime is infused in an amount of 5-20 kg per tonne of melt.
According to another aspect of the invention, pre-reduced iron fines are injected. The injection of iron leads to a higher calorific value in the upper gas. The injected cold pre-reduced iron requires heat to melt, which is provided by burning hot air and / or oxygen injection with high oxygen content and extra injection fuel. The amount of pre-reduced iron injected is in the range of 20-200 kg per tonne of molten iron, with iron having a minimum metallization of 90%.
The top gas obtained by the production process according to the invention has a sufficient calorific value that can be used directly in the gas turbine of the power plant. Preferably, the top gas is used in the combined cycle power plant to further increase the overall efficiency of the combined process.
In the drawings, the process flow diagram shows a possible realization of a furnace and power plant employing the process of the invention.
The
By the
The upper gas discharged into the iron manufacturing process in the
Some of the purified upper gas can be returned to the breeze heating system 4 and used to heat the hot air.
In the gas purification system 8, the top gas is purified and sent to the combined cycle power plant 10. Combined cycle power plant 10 produces electricity and steam.
The operation of the furnace process is adjusted by controlling the injection of oxygen, fuel and additives according to the load of the furnace so that the combined process of the furnace and the combined cycle power plant is optimized. This also depends on the actual power required by the combined cycle power plant.
The energy content of the upper gas is maximized by satisfying a combination of a predetermined specific calorific value (J / m 3) of the upper gas and a predetermined volume (
Chemical control of slag basicity is achieved by injected quicklime. This allows a very quick response in situations requiring the stopping of the furnace.
Control of the gas flow in the furnace is achieved by load distribution similar to normal furnace operation.
Thermal control of the furnace is achieved by coal injection by adjusting the heat balance of the raceway.
1 is a process flow diagram illustrating a furnace and a power plant employing the process of the present invention.
* Explanation of symbols for the main parts of the drawings
1: furnace 2: material supply
3: blowing system 4: blowing heating system
5: oxygen plant 6: fuel injection device
7: additive injection 8: gas purification system
9: oxygen outlet 10: combined cycle power plant
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09000194 | 2009-01-09 | ||
EP09000194.2 | 2009-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20100082696A true KR20100082696A (en) | 2010-07-19 |
Family
ID=40679429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020090026285A KR20100082696A (en) | 2009-01-09 | 2009-03-27 | Process for making iron in a blast furnace and use of top gas resulting from said process |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20100082696A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2423880A2 (en) | 2010-08-25 | 2012-02-29 | Pantech Co., Ltd. | Apparatus and method for providing augmented reality (AR) using a marker |
EP2719778A1 (en) * | 2012-10-12 | 2014-04-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Blast-furnace process with CO2-lean blast furnace gas recycle and production plant for same |
EP2719779A1 (en) * | 2012-10-12 | 2014-04-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Blast-furnace process with recycle of a CO-fraction of the blast furnace gas and production plant for same |
CN113718074A (en) * | 2021-09-03 | 2021-11-30 | 中冶赛迪工程技术股份有限公司 | Low-carbon blast furnace iron-making method |
-
2009
- 2009-03-27 KR KR1020090026285A patent/KR20100082696A/en not_active Application Discontinuation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2423880A2 (en) | 2010-08-25 | 2012-02-29 | Pantech Co., Ltd. | Apparatus and method for providing augmented reality (AR) using a marker |
EP2719778A1 (en) * | 2012-10-12 | 2014-04-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Blast-furnace process with CO2-lean blast furnace gas recycle and production plant for same |
EP2719779A1 (en) * | 2012-10-12 | 2014-04-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Blast-furnace process with recycle of a CO-fraction of the blast furnace gas and production plant for same |
CN113718074A (en) * | 2021-09-03 | 2021-11-30 | 中冶赛迪工程技术股份有限公司 | Low-carbon blast furnace iron-making method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN101519703B (en) | Low-coke-ratio blast furnace ironmaking technique | |
CN101831517B (en) | Blast furnace coal gasification air heating furnace smelting method | |
CN103451344B (en) | CEO compound smelting reduction ironmaking plant and technology | |
US9377242B2 (en) | Method for treating waste gases from plants for pig iron production | |
CN106282455A (en) | A kind of blast furnace hydrogen-rich smelting process efficiently utilizing metallurgic waste gas | |
JP6354962B2 (en) | Oxygen blast furnace operation method | |
Bisio | Exergy method for efficient energy resource use in the steel industry | |
CN101724727B (en) | Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources | |
CN114686633A (en) | Method for pre-heat exchanging hydrogen by utilizing direct reduction iron furnace top gas | |
KR20100082696A (en) | Process for making iron in a blast furnace and use of top gas resulting from said process | |
CN204752780U (en) | Melting reduction iron -smelting device | |
CN102010918A (en) | Environmental-friendly energy-saving blast-furnace oxygen ironmaking method | |
SU1138036A3 (en) | Method of operation of blast furnace and system for producing molten iron and reducing gas | |
SK15682002A3 (en) | Method and device for producing pig iron or liquid steel pre-products from charge materials containing iron ore | |
Kumar et al. | Operating experiences with Corex and blast furnace at JSW Steel Ltd | |
CN115516115A (en) | Biomass direct reduced iron | |
CN102127610B (en) | Ironmaking equipment and process for direct smelting reduction of iron ore | |
KR101607254B1 (en) | Combiner Ironmaking facilities | |
KR101322903B1 (en) | Apparatus for manufacturing molten iron and method for manufacturing the same | |
CN107164594A (en) | A kind of BGL gasifying gas produces the system and method for DRI through dual turn over metaplasia | |
CN113969329A (en) | Metal reduction smelting method and system for reducing carbon dioxide emission | |
CN107151720A (en) | A kind of Lurgi gasifying gas converts the system and method for producing DRI through steam | |
CN101603103A (en) | Pure reduction blast furnace iron making method | |
RU2583558C2 (en) | Deepening of oxygen jet penetration | |
CN101875990A (en) | Device and method for smelting iron by gasifying cold bonded coal-containing iron powder pellets |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WITN | Withdrawal due to no request for examination |