CN102703727A - Method for comprehensively utilizing gas and dust in steel works - Google Patents
Method for comprehensively utilizing gas and dust in steel works Download PDFInfo
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- CN102703727A CN102703727A CN2012102191095A CN201210219109A CN102703727A CN 102703727 A CN102703727 A CN 102703727A CN 2012102191095 A CN2012102191095 A CN 2012102191095A CN 201210219109 A CN201210219109 A CN 201210219109A CN 102703727 A CN102703727 A CN 102703727A
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Abstract
The invention relates to a method for comprehensively utilizing gas and dust in steel works. The method is characterized by comprising the following steps of: proportioning and pelletizing the recovered gas and dust in steel works according to a certain ratio to form self-reducing pellets; drying the self-reducing pellets, and adding the self-reducing pellets into a rotary hearth furnace; rotating the self-reducing pellets for a circle in the rotary hearth furnace to be reduced to sponge iron, and feeding the sponge iron into a blast furnace, a converter or an electric furnace, wherein the gas in the steel works is used as fuel in the rotary hearth furnace; and carrying out waste heat recovery on the smoke gas generated from the rotary hearth furnace, wherein the recovered heat is used for preheating the gas in the steel works as the fuel of the rotary hearth furnace or is fed into a hot blast stove for preheating air in the hot blast stove.
Description
Technical field
The invention belongs to the Iron And Steel Industry technical field, relate to the method for comprehensive utilization of a kind of Iron And Steel Plant coal gas and dust.
Background technology
Environmental requirement that steel industry is increasingly serious and Market Situation require iron and steel enterprise must accomplish energy-saving and emission-reduction, reduce cost.In iron and steel enterprise's production process, a large amount of by product coal gas and the dust of annual generation.At present, obtained utilizing preferably though Iron And Steel Plant's coal gas acts as a fuel, but still be difficult to avoid that a large amount of coal gas diffusions is arranged every year.And the processing of dust then utilizes less.If do not reclaim, the outward transport processing costs of not only contaminate environment, and increase enterprise, aggravation enterprise production cost.Along with the importance of environmental protection and comprehensive utilization of resources is familiar with by people day by day, the processing of Iron And Steel Plant's dust also enjoys industry to pay close attention to.
Summary of the invention
Problem to be solved by this invention is to having the present situation that Iron And Steel Plant's coal gas and dust can't rationally efficiently utilize now; A kind of method that fully utilizes Iron And Steel Plant's coal gas and dust is proposed; Rational and effective is utilized Iron And Steel Plant's coal gas and dust; Better improve the economic utilization efficient of coal gas, the realization dust is turned waste into wealth, and reduces waste discharge.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of method that fully utilizes Iron And Steel Plant's coal gas and dust is characterized in that: after proportioning is made ball in proportion with coal dust with the Iron And Steel Plant's dust that reclaims, form the autoreduction pelletizing, the autoreduction pelletizing is after oven dry, in the adding rotary hearth furnace; Rotary hearth furnace adopts Iron And Steel Plant's coal gas to act as a fuel; The autoreduction pelletizing is reduced into sponge iron after the rotary hearth furnace inward turning circles, be sent to blast furnace, converter or electric furnace and use; The flue gas that rotary hearth furnace is produced carries out waste heat recovery; Afterwards; The heat that reclaims is used for preheating as Iron And Steel Plant's coal gas of rotary hearth furnace fuel or be sent to hotblast stove preheating heat wind furnace air, and the calorie distribution amount of recovery is according to the Iron And Steel Plant coal gas of the preferential preheating of field condition as rotary hearth furnace fuel; Flue gas after the waste heat recovery is then used in dry autoreduction pelletizing.
By technique scheme, described Iron And Steel Plant dust comprises blast furnace dust, converter dust, iron scale, gravitational dust collection ash, waste; Described Iron And Steel Plant coal gas comprises blast furnace gas, coal gas of converter, coke-oven gas, and various coal gas respectively as rotary hearth furnace fuel, perhaps mix the back as rotary hearth furnace fuel according to field condition.
By technique scheme, the sponge iron degree of metalization of described rotary hearth furnace production is higher than at 80% o'clock, directly as converter or Electric furnace steel making raw material; Degree of metalization is lower than at 80% o'clock, adds in the blast furnace to use.
By technique scheme, said rotary hearth furnace reduction temperature is 1300 ℃～1500 ℃.
By technique scheme, the said rotary hearth furnace reduction time is 10～15 minutes.
The invention has the beneficial effects as follows: the utilising efficiency that has improved Iron And Steel Plant's coal gas and dust; Reduced the discharging of dust, reduced the intractability of dust, directly Iron And Steel Plant's dust has been converted into raw material on the spot and is used; Improved the comprehensive utilization ratio of resource; Reduced environmental pollution, when reducing enterprise's dust disposal cost, can also considerable economic benefit and social benefit.
Description of drawings
Accompanying drawing 1 is a principle of work block diagram of the present invention.
Embodiment
For understanding the present invention better, below in conjunction with embodiment the present invention is further described, but is not construed as limiting the invention.
Embodiment 1
1) Iron And Steel Plant's dust, coal dust, sticker etc. are made ball behind the mixing in proportion, form the autoreduction pelletizing;
2) with the flue gas that carries out after the waste heat recovery autoreduction pelletizing is dried;
3) rotary hearth furnace all adopts blast furnace gas to act as a fuel;
4) the autoreduction pelletizing after will drying adds in the rotary hearth furnace and reduces, and reduction temperature is 1380 ℃, and the recovery time is 12 minutes;
5) degree of metalization that obtains after will reducing is that 68% sponge iron adds in the blast furnace, uses as blast furnace ironmaking raw material;
6) high-temperature flue gas of rotary hearth furnace generation reclaims through residual neat recovering system, and the heat of recovery all is used for the blast furnace gas of preheating as rotary hearth furnace fuel.
Embodiment 2
1) Iron And Steel Plant's dust, coal dust, sticker etc. are made ball behind the mixing in proportion, form the autoreduction pelletizing;
2) with the flue gas that carries out after the waste heat recovery autoreduction pelletizing is dried;
3) rotary hearth furnace all adopts coke-oven gas to act as a fuel;
4) the autoreduction pelletizing after will drying adds in the rotary hearth furnace and reduces, and reduction temperature is 1420 ℃, and the recovery time is 10 minutes;
5) degree of metalization that obtains after will reducing is that 85% sponge iron adds in the converter, uses as the converter steelmaking raw material;
6) high-temperature flue gas of rotary hearth furnace generation reclaims through residual neat recovering system, and half is used for the coke-oven gas of preheating as rotary hearth furnace fuel the heat of recovery, and half is used for preheating heat wind furnace air.
Embodiment 3
1) Iron And Steel Plant's dust, coal dust, sticker etc. are made ball behind the mixing in proportion, form the autoreduction pelletizing;
2) with the flue gas that carries out after the waste heat recovery autoreduction pelletizing is dried;
3) rotary hearth furnace adopts blast furnace gas and coke-oven gas respectively to account for 50% gas mixture to act as a fuel;
4) the autoreduction pelletizing after will drying adds in the rotary hearth furnace and reduces, and reduction temperature is 1400 ℃, and the recovery time is 11 minutes;
5) degree of metalization that obtains after will reducing is that 83% sponge iron adds in the electric furnace, uses as the Electric furnace steel making raw material;
6) high-temperature flue gas of rotary hearth furnace generation reclaims through residual neat recovering system, and the heat of recovery 60% is used for the coke-oven gas of preheating as rotary hearth furnace fuel, and 40% is used for preheating heat wind furnace air.
Embodiment 4
1) Iron And Steel Plant's dust, coal dust, sticker etc. are made ball behind the mixing in proportion, form the autoreduction pelletizing;
2) with the flue gas that carries out after the waste heat recovery autoreduction pelletizing is dried;
3) rotary hearth furnace adopts the gas mixture of blast furnace gas, coal gas of converter, coke-oven gas to act as a fuel, and in the gas mixture, blast furnace gas: coal gas of converter: the ratio of coke-oven gas is 5:2:3;
4) the autoreduction pelletizing after will drying adds in the rotary hearth furnace and reduces, and reduction temperature is 1390 ℃, and the recovery time is 12 minutes;
5) degree of metalization that obtains after will reducing is that 72% sponge iron adds in the blast furnace, uses as blast furnace ironmaking raw material;
6) high-temperature flue gas of rotary hearth furnace generation reclaims through residual neat recovering system, and the heat of recovery 80% is used for the coke-oven gas of preheating as rotary hearth furnace fuel, and 20% is used for preheating heat wind furnace air.
Above disclosedly be merely preferred embodiment of the present invention, change, still belong to protection scope of the present invention according to the equivalence that the present invention did.
Claims (6)
1. method that fully utilizes Iron And Steel Plant's coal gas and dust is characterized in that: after proportioning is made ball in proportion with coal dust with the Iron And Steel Plant's dust that reclaims, form the autoreduction pelletizing, the autoreduction pelletizing is after oven dry, in the adding rotary hearth furnace; Rotary hearth furnace adopts Iron And Steel Plant's coal gas to act as a fuel; The autoreduction pelletizing is reduced into sponge iron after the rotary hearth furnace inward turning circles, be sent to blast furnace, converter or electric furnace and use; The flue gas that rotary hearth furnace is produced carries out waste heat recovery; Afterwards; The heat that reclaims is used for preheating as Iron And Steel Plant's coal gas of rotary hearth furnace fuel or be sent to hotblast stove preheating heat wind furnace air, and the calorie distribution amount of recovery is according to the Iron And Steel Plant coal gas of the preferential preheating of field condition as rotary hearth furnace fuel; Flue gas after the waste heat recovery is then used in dry autoreduction pelletizing.
2. method according to claim 1 is characterized in that: described Iron And Steel Plant dust comprises blast furnace dust, converter dust, iron scale, gravitational dust collection ash, waste; Described Iron And Steel Plant coal gas comprises blast furnace gas, coal gas of converter, coke-oven gas, and various coal gas respectively as rotary hearth furnace fuel, perhaps mix the back as rotary hearth furnace fuel according to field condition.
3. method according to claim 1 and 2 is characterized in that: the sponge iron degree of metalization of described rotary hearth furnace production is higher than at 80% o'clock, directly as converter or Electric furnace steel making raw material; Degree of metalization is lower than at 80% o'clock, adds in the blast furnace to use.
4. method according to claim 1 and 2 is characterized in that: said rotary hearth furnace reduction temperature is 1300 ℃～1500 ℃.
5. method according to claim 3 is characterized in that: said rotary hearth furnace reduction temperature is 1300 ℃～1500 ℃.
6. according to claim 1 or 2 or 5 described methods, it is characterized in that: the said rotary hearth furnace reduction time is 10～15 minutes.
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| CN2012102191095A CN102703727A (en) | 2012-06-29 | 2012-06-29 | Method for comprehensively utilizing gas and dust in steel works |
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| CN2012102191095A CN102703727A (en) | 2012-06-29 | 2012-06-29 | Method for comprehensively utilizing gas and dust in steel works |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104870663A (en) * | 2012-12-21 | 2015-08-26 | 株式会社Posco | Method for reusing iron-containing by-product and apparatus therefor |
| CN106367600A (en) * | 2016-08-29 | 2017-02-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for treating high-zinc iron-containing slime through utilizing rotary kiln |
| CN107083461A (en) * | 2012-12-07 | 2017-08-22 | 新日铁住金工程技术株式会社 | The operating method of blast furnace and the manufacture method of molten iron |
| CN109943678A (en) * | 2019-05-13 | 2019-06-28 | 重庆工商大学 | A kind of direct-reduction technique using coal gas of converter production sponge iron |
| CN114395697A (en) * | 2022-01-04 | 2022-04-26 | 中冶南方工程技术有限公司 | Method for reducing carbon emission in reduction dezincification process |
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| CN1134983A (en) * | 1995-05-04 | 1996-11-06 | 北京科技大学 | Process for prodn. of spongy iron or metallized ball block |
| CN1940092A (en) * | 2005-09-27 | 2007-04-04 | 万天骥 | Fuse reducing iron-smelting process for rotating furnace |
| CN101134999A (en) * | 2007-03-15 | 2008-03-05 | 大连熔融还原设备制造有限公司 | Metallized pellet and method for preparing the same |
| CN101892382A (en) * | 2010-07-16 | 2010-11-24 | 中冶南方工程技术有限公司 | Method for extracting high-content nickel, chromium and iron from stainless steel dust |
| CN102559980A (en) * | 2012-01-04 | 2012-07-11 | 中冶南方工程技术有限公司 | Method for producing sponge iron by using blast furnace gas |
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2012
- 2012-06-29 CN CN2012102191095A patent/CN102703727A/en active Pending
Patent Citations (5)
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| CN1134983A (en) * | 1995-05-04 | 1996-11-06 | 北京科技大学 | Process for prodn. of spongy iron or metallized ball block |
| CN1940092A (en) * | 2005-09-27 | 2007-04-04 | 万天骥 | Fuse reducing iron-smelting process for rotating furnace |
| CN101134999A (en) * | 2007-03-15 | 2008-03-05 | 大连熔融还原设备制造有限公司 | Metallized pellet and method for preparing the same |
| CN101892382A (en) * | 2010-07-16 | 2010-11-24 | 中冶南方工程技术有限公司 | Method for extracting high-content nickel, chromium and iron from stainless steel dust |
| CN102559980A (en) * | 2012-01-04 | 2012-07-11 | 中冶南方工程技术有限公司 | Method for producing sponge iron by using blast furnace gas |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107083461A (en) * | 2012-12-07 | 2017-08-22 | 新日铁住金工程技术株式会社 | The operating method of blast furnace and the manufacture method of molten iron |
| CN107083461B (en) * | 2012-12-07 | 2019-05-10 | 新日铁住金工程技术株式会社 | The operating method of blast furnace and the manufacturing method of molten iron |
| CN104870663A (en) * | 2012-12-21 | 2015-08-26 | 株式会社Posco | Method for reusing iron-containing by-product and apparatus therefor |
| US20150292051A1 (en) * | 2012-12-21 | 2015-10-15 | Posco | Method for reusing iron-containing by-product and apparatus therefor |
| CN106367600A (en) * | 2016-08-29 | 2017-02-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for treating high-zinc iron-containing slime through utilizing rotary kiln |
| CN109943678A (en) * | 2019-05-13 | 2019-06-28 | 重庆工商大学 | A kind of direct-reduction technique using coal gas of converter production sponge iron |
| CN114395697A (en) * | 2022-01-04 | 2022-04-26 | 中冶南方工程技术有限公司 | Method for reducing carbon emission in reduction dezincification process |
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Application publication date: 20121003 |