CN102086479A - Method for producing sponge iron by rotary hearth furnace - Google Patents
Method for producing sponge iron by rotary hearth furnace Download PDFInfo
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- CN102086479A CN102086479A CN2009102412700A CN200910241270A CN102086479A CN 102086479 A CN102086479 A CN 102086479A CN 2009102412700 A CN2009102412700 A CN 2009102412700A CN 200910241270 A CN200910241270 A CN 200910241270A CN 102086479 A CN102086479 A CN 102086479A
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- sponge iron
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- rotary hearth
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Abstract
The invention provides a method for producing sponge iron by a rotary hearth furnace. The method is characterized in that an oxygen-enriched combustion technology is adopted to ensure that the oxygen enrichment rate of combustion air is between 23 and 32 percent. In the method, raw materials for production can be recovered iron-containing zinc-containing dust of steel works, so that the method is applicable to the treatment of the recovered iron-containing zinc-containing dust of the steel works and is favorable for environmental protection and waste utilization. Through the method, the combustion temperature is raised, the internal temperature of the furnace is raised and the reduction rate of the sponge iron is improved, the reoxygenation probability of the sponge iron is reduced, and the productivity is improved. The oxygen-enriched combustion technology is adopted, so the required quantity of the combustion air is reduced and the discharge amount of flue gas is reduced, so that the heat loss of flue gas emission is reduced and the consumption of fuel is reduced. Subsequent dust removal by flue gas and useful dust recovery efficiencies are improved, the type and specification of equipment are also correspondingly reduced, and investment economy is improved.
Description
Technical field
The present invention relates to a kind of method of on rotary hearth furnace, producing sponge iron.The invention belongs to heat energy and effectively utilize technical field, relate to the rotary hearth furnace combustion technology.
Background technology
1, the production status of sponge iron
Be lower than the iron-making production that under the temperature of fusion reduction of iron ore is become sponge iron, its product is direct-reduced iron (being DRI), also claims sponge iron.Sponge iron has characteristics such as harmful residual element such as lumpiness is moderate, structured size, sulphur phosphorus are few with respect to steel scrap.Replace the main raw material of steel scrap with sponge iron, can effectively dilute harmful element, reduce the content of gas and inclusion, the yield strength of steel, extension property, cold-forming property, heat treatment performance, welding property etc. are made moderate progress as Electric furnace steel making.Because steel scrap resource worsening shortages, along with the growth of Electric furnace steel making ratio and to the increase in demand of senior steel, the whole world is increasing to the demand of sponge iron simultaneously.Therefore and the sponge iron output breach of China is also very big, can be efficient on rotary hearth furnace, produce high-quality sponge iron to energy-saving and environmental protection and will have far reaching significance.
2, oxygen-enriched combustion technology
Oxygen-enriched combustion technology is to reduce the technology of combustion air total amount by the oxygen level in the increase combustion air.Its characteristics are:
(1) combustionvelocity improves, and promotes that fuel combustion is complete.
(2) coefficient of excess air reduces.Usually select coefficient of excess air α=1.05～1.10, to obtain higher flame temperature, again can perfect combustion.
(3) because required combustion-supporting air quantity reduces, smoke discharge amount reduces, thereby has also reduced heat loss due to exhaust gas.
(4) flame temperature improves, and flame intensity increases, the enhance heat transfer effect.Flame temperature increases along with the increase of oxygen concn, but along with oxygen concn improves gradually, the amplitude that flame temperature increases descends gradually.In order to effectively utilize oxygen-rich air, make effect the most obvious, its oxygen-rich concentration is selected very crucial.
On rotary hearth furnace, adopt oxygen-enriched combustion technology to produce sponge iron and yet there are no report.
Summary of the invention
Purpose of the present invention is intended to propose a kind of technological line, and a kind of method that oxygen-enriched combustion technology is produced sponge iron of using on rotary hearth furnace is provided.
The method that a kind of rotary hearth furnace that the present invention proposes is produced sponge iron is characterized in that combustion air adopts oxygen-enriched combustion technology, makes its oxygen enrichment percentage at 23%-32%.Thereby temperature of combustion raises, and the sponge iron reduction rate is accelerated, and reduces sponge iron and reoxidizes probability.Exhaust gas volumn reduces, and has improved thermo-efficiency.
In the aforesaid method, raw materials for production can adopt Steel Plant's iron content zinc-containing dust of recovery.Combustion air adopts oxygen-enriched combustion technology, and required combustion-supporting air quantity reduces, and smoke discharge amount reduces, thereby reduces heat loss due to exhaust gas, reduces fuel consumption.Follow-up flue gas contains useful dust organic efficiency raisings such as zinc, and the unit type specification is also corresponding to be reduced, the investment economy raising.
Primary air, secondary combustion air adopt respectively also and can all adopt oxygen-enriched combustion technology in process of production.
Beneficial effect of the present invention is: propose first oxygen-enriched combustion technology is applied on the rotary hearth furnace of producing sponge iron, especially raw materials for production are Steel Plant's iron content zinc-containing dust of recovery, this method is applicable to handles the iron content zinc-containing dust that Steel Plant reclaim, help environmental protection and utilization of waste material.Because combustionvelocity is accelerated, temperature increase speeds up in the stove, thus the quickening of sponge iron reduction rate, the secondary oxidation rate is low, and degree of metalization improves; Coefficient of excess air reduces, and required combustion-supporting air quantity reduces, and smoke discharge amount reduces, thereby thermosteresis reduces.Follow-up flue gas ash removal, useful dust organic efficiency improve, and the unit type specification is also corresponding to reduce the investment economy raising.
Embodiment
The present invention will be further described below in conjunction with specific embodiment.
Embodiment 1
On the rotary hearth furnace of producing sponge iron, adopt common raw materials for production, in process of production, adopt oxygen-enriched combustion technology during primary air, make its oxygen enrichment percentage 30%.Combustion-supporting air quantity reduces 15%, and smoke discharge amount reduces 13%, and heat loss due to exhaust gas will reduce by 13%, thereby reduces fuel consumption.
Embodiment 2
On the rotary hearth furnace of producing sponge iron, adopt the Steel Plant's iron content zinc-containing dust that reclaims as raw materials for production, in process of production, adopt oxygen-enriched combustion technology during the secondary combustion air, make its oxygen enrichment percentage 29%.Combustion-supporting air quantity reduces 13%, and smoke discharge amount reduces 11%, thereby reduces heat loss due to exhaust gas, reduces fuel consumption.
Embodiment 3
On the rotary hearth furnace of producing sponge iron, adopt the Steel Plant's iron content zinc-containing dust that reclaims as raw materials for production, in process of production, adopt oxygen-enriched combustion technology during primary air, make its oxygen enrichment percentage 32%; Also adopt oxygen-enriched combustion technology during the secondary combustion air, make its oxygen enrichment percentage 32%.Combustion-supporting air quantity reduces 38%, and smoke discharge amount reduces 32%, reduces heat loss due to exhaust gas 30%, reduces fuel consumption.Follow-up flue gas contains the ability of useful dust recovery systems such as zinc can dwindle 1/3rd, not only reduces investment, the also corresponding reduction of equipment working cost.
Claims (3)
1. the method that rotary hearth furnace is produced sponge iron is characterized in that, combustion air adopts oxygen-enriched combustion technology, makes its oxygen enrichment percentage at 23%-32%.
2. rotary hearth furnace according to claim 1 is produced the method for sponge iron, it is characterized in that, raw materials for production adopt the Steel Plant's iron content zinc-containing dust that reclaims.
3. rotary hearth furnace according to claim 1 and 2 is produced the method for sponge iron, it is characterized in that, primary air is or/and the secondary combustion air adopts oxygen-enriched combustion technology in process of production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102412700A CN102086479A (en) | 2009-12-03 | 2009-12-03 | Method for producing sponge iron by rotary hearth furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102412700A CN102086479A (en) | 2009-12-03 | 2009-12-03 | Method for producing sponge iron by rotary hearth furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102086479A true CN102086479A (en) | 2011-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102412700A Pending CN102086479A (en) | 2009-12-03 | 2009-12-03 | Method for producing sponge iron by rotary hearth furnace |
Country Status (1)
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| CN (1) | CN102086479A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994680A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Controllable atmosphere rotary hearth furnace process for producing direct reduction iron |
| 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 |
|---|---|---|---|---|
| CN1389574A (en) * | 2002-05-31 | 2003-01-08 | 北京科技大学 | Production process of directly reduced iron with carbon-containing iron ore pellet |
| CN101445869A (en) * | 2008-12-22 | 2009-06-03 | 莱芜钢铁集团有限公司 | Method for manufacturing metallic pellets by direct reduction of oxygen-enriched combustion in rotary furnace |
-
2009
- 2009-12-03 CN CN2009102412700A patent/CN102086479A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1389574A (en) * | 2002-05-31 | 2003-01-08 | 北京科技大学 | Production process of directly reduced iron with carbon-containing iron ore pellet |
| CN101445869A (en) * | 2008-12-22 | 2009-06-03 | 莱芜钢铁集团有限公司 | Method for manufacturing metallic pellets by direct reduction of oxygen-enriched combustion in rotary furnace |
Non-Patent Citations (2)
| Title |
|---|
| 张海燕 等: "宝钢环形加热炉采用富氧燃烧技术的可行性研究", 《工业加热》 * |
| 胡俊鸽 等: "转底炉炼铁工艺发展现状", 《冶金丛刊》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994680A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Controllable atmosphere rotary hearth furnace process for producing direct reduction iron |
| 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 |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20110608 |