CN109402384A - A method of sintering reduces NOx - Google Patents
A method of sintering reduces NOx Download PDFInfo
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- CN109402384A CN109402384A CN201811598611.5A CN201811598611A CN109402384A CN 109402384 A CN109402384 A CN 109402384A CN 201811598611 A CN201811598611 A CN 201811598611A CN 109402384 A CN109402384 A CN 109402384A
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- sintering
- nox
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- sinter
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- Geochemistry & Mineralogy (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a kind of methods that sintering reduces NOx, and step includes ingredient, mixed pelletization, cloth and igniting, are sintered and cooled and sieve, NOx detection.The method that a kind of sintering provided by the invention reduces NOx, it is therefore an objective to by carrying out NOx abatement to sintered material adjustment, specially increase and match iron powder, reduce fuel ratio, control the ratio of the two；Auxiliary replaces the combustion heat release of fuel in conventional sintering by iron powder with sintering process parameter appropriate control in sintering process oxidation heat liberation, finally while making to sinter mine into, realizes the emission reduction of sintering NOx.The technique, which can be realized, does not change current sintering process process, only changes ingredient and some processes parameter, that is, realizes the significant emission reduction of NOx.
Description
Technical field
The invention belongs to be sintered emission reduction field, in particular to a kind of method that sintering reduces NOx.Purpose is by sintering
Batching adjusting carries out NOx abatement, replaces the combustion heat release of fuel in conventional sintering in sintering process oxidation heat liberation by iron powder, most
Eventually while making to sinter mine into, the emission reduction of sintering NOx is realized.
Background technique
Sintering is used as pollutant emission rich and influential family in steel industry, contributes to about 50% NOx emission.And sintering NOx row
Put and belong to fuel type NOx, 90% by be sintered fuel tape used Lai.It is bonded to mine since sintering belongs to liquid phase, fuel
Using inevitable, the proportion of conventional sintering process solid fuel is substantially in 3-5%.Forefathers studied using gas fuel such as day
The gaseous fuels such as right gas, coke-stove gas substitute solid fuel, and a large amount of measures was also taken to improve ore matching and technique such as with addition of magnetic
Iron Ore Powder implements deep bed sintering to reduce the consumption of solid fuel, but final solid fuel reduces limited extent, it is substantially minimum
40-45kg/t is horizontal, and therefore, the reduction limited extent of NOx, basic sintering flue gas NOx content is in 200-300mg/Nm3 level.
If can use a kind of method that can significantly reduce solid fuel with addition of realizing carbon-free sintering, get rid of the generation of fuel type NOx, then
Sintering NOx may be significantly reduced.
Summary of the invention
In order to solve the above technical problems, The present invention provides a kind of sinter mixture of low NOx generation amount and it is based on this
The method that the sintering of the sinter mixture of the low NOx generation amount of kind reduces NOx.
To achieve the goals above, the technical solution adopted in the present invention is as follows:
A kind of sinter mixture of low NOx generation amount, including following component: Iron Ore Powder quality proportioning is 50-80%, raw stone
Grey quality proportioning is 0-8%, and lime stone quality proportioning is 0-10%, and dolomite quality proportioning is 0-10%, fuel mass proportion
For 0-3%, iron powder quality proportioning is 0.5-15%, and, to return mine, the gross mass proportion of the sinter mixture is 100% for remaining.
A method of sintering reduces NOx, includes the following steps:
(1) sinter mixture of low NOx generation amount as described above successively mixed pelletization: is passed through into a trommel mixer
Wetting and secondary trommel mixer mixed pelletization are mixed, mixing the total Water being added during wetting and mixed pelletization is raw material group
Divide the 6.0-8.0% of total weight, mixes wetting and the mixed pelletization time controls in 2-4min；
(2) cloth and igniting: the sinter mixture after step (1) mixing granulation is uniformly distributed on the sintering machine trolley, and control
Thickness of feed layer processed is 500-900mm；Then ignition of sintering process and to control the firing temperature of sintering machine be 950-1200 DEG C, when igniting
Between 1-3min, igniting negative pressure be 3000-10000Pa；
(3) be sintered: after ignition of sintering process, control control sintering negative pressure is 6000-20000Pa.
The method that a kind of sintering provided by the invention reduces NOx, it is therefore an objective to be subtracted by adjusting progress NOx to sintered material
Row specially increases and matches iron powder, reduces fuel ratio, controls the ratio of the two；Auxiliary is led to sintering process parameter appropriate control
The combustion heat release that iron powder replaces fuel in conventional sintering in sintering process oxidation heat liberation is crossed, finally while making to sinter mine into,
Realize the emission reduction of sintering NOx.The technique, which can be realized, does not change current sintering process process, only changes ingredient and some processes ginseng
Number realizes the significant emission reduction of NOx.
It is provided by the invention it is a kind of sintering reduce NOx method, the advantage is that: 1, do not need transformation sintering process process
Realize the emission reduction of sintering NOx；It 2, will sintering NOx row from source using the burning of the oxidation heat liberation alternative fuel of iron powder
Put reduction by 10% or so.
Detailed description of the invention
Fig. 1 is the flow diagram of the sintering reduction NOx method in the embodiment of the present invention 1.
Specific embodiment
The present invention is described in further detail below with reference to embodiment:
Embodiment 1:
Referring to Fig. 1, the embodiment of the invention provides a kind of methods that sintering reduces NOx, and step includes ingredient, mixes system
Grain, cloth and igniting, sintering further include cooling after sintering process and screening and NOx detection.
(1) sinter mixture ingredient (following proportion is mass percent):
Iron Ore Powder proportion 60%, quick lime proportion 5%, lime stone proportion 0%, dolomite proportion 7%, dosage of coke 2%,
Iron powder proportion 10%, proportion of returning mine are 16%.
(2) mixed pelletization: selected sinter mixture component is passed through into a cylinder respectively and mixes mixing wetting and two
Secondary trommel mixer mixed pelletization is added suitable moisture and is mixed and pelletized.
Mixing the total Water being added during wetting and mixed pelletization is the 7.0% of raw material components total weight, mixes wetting
It is controlled in 4min with the mixed pelletization time.
(3) cloth and igniting:
On the sintering machine trolley by the uniform cloth of sinter mixture after mixed pelletization, the thickness control of sinter bed is made to exist
700mm；The firing temperature for controlling sintering machine is 1080 DEG C, duration of ignition 1.5min, and light a fire vacuum cavitations 7000Pa.
(4) sinter:
After ignition of sintering process, fuel and iron powder in sinter mixture start burning or oxidation heat liberation, control sintering negative pressure
For 15000Pa.
(5) cooling and screening: using the outer type of cooling of cooling or machine on any machine, it is reduced to the temperature of sinter
200 DEG C or less (the present embodiment selects the outer type of cooling of machine)；
Sieve pore is used to sieve for the vibrating screen of 5mm to the sinter after cooling treatment, screenings is sinter return fine, sieve
Upper object is that finished product sinter is sent to blast furnace；
(6) test analysis, the present embodiment NOx are carried out to NOx in sintering flue gas using flue gas analyzer generally in the art
Production quantity be 270mg/m3。
Comparative example 1:
(1) sinter mixture ingredient (following proportion is mass percent):
Iron Ore Powder proportion 60%, quick lime proportion 5%, lime stone proportion 0%, dolomite proportion 7%, dosage of coke 4%,
Iron powder proportion 0%, proportion of returning mine are 24%.
Relative to this comparative example 1, (0 to 10%, 10%) increase is fuel to the increment of iron powder proportion in embodiment 1
Proportion decrement (4% to 2%, reduce 5 times 2%).
(2) it mixes and pelletizes: selected sinter mixture component being passed through into primary and secondary trommel mixer respectively, is added
Enter suitable moisture to be mixed and pelletized.
The water distribution quantity control of raw material is the 7.0% of sinter mixture gross mass, primary mixer and secondary trommel mixer
Granulation time control 2 and 4min respectively.
(3) cloth and igniting:
On the sintering machine trolley by the uniform cloth of feed particles after mixing granulation, the thickness control of sinter bed is made to exist
In the range of 750mm；The firing temperature for controlling sintering machine is 1050 DEG C, duration of ignition 1min, and light a fire vacuum cavitations 7000Pa.
(4) it is sintered:
After ignition of sintering process, the fuel in raw material starts combustion heat release, and control sintering negative pressure is 14000Pa.
(5) cooling and screening: using the outer type of cooling of cooling or machine on any machine, it is reduced to the temperature of sinter
200 DEG C or less；
Sieve uses sieve pore to sieve for the vibrating screen of 5mm to the sinter after cooling treatment three times, and screenings is sintering
It returns mine, oversize is that finished product sinter is sent to blast furnace.
(6) test analysis, this comparative example are carried out to NOx in sintering flue gas using flue gas analyzer generally in the art
The production quantity of middle NOx is 300mg/m3。
In sintering NOx process emission reduction new process, the advantage compared with conventional sintering technique is, has broken traditionally solid
Mode of the fluid fuel as heat source is guaranteeing to sinter by substituting coke powder combustion heat release with oxidation of iron powder heat release with addition of iron powder
While mine, reduce the generation of NOx.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (2)
1. a kind of sinter mixture of low NOx generation amount, it is characterised in that: the mixture includes following component: iron ore silty
Amount proportion is 50-80%, and Lime Quality proportion is 0-8%, and lime stone quality proportioning is 0-10%, and dolomite quality proportioning is
0-10%, fuel mass proportion are 0-3%, and iron powder quality proportioning is 0.5-15%, remaining is to return mine, the sinter mixture
Gross mass proportion is 100%.
2. a kind of method that sintering reduces NOx, it is characterised in that: described method includes following steps:
(1) mixed pelletization: the sinter mixture of low NOx generation amount as described in claim 1 is successively passed through into a cylinder and is mixed
Conjunction machine mixes wetting and secondary trommel mixer mixed pelletization, and mixing the total Water being added during wetting and mixed pelletization is original
Expect the 6.0-8.0% of component weight, mixes wetting and the mixed pelletization time is 2-4min；
(2) cloth and igniting: the sinter mixture after step (1) mixing granulation is uniformly distributed on the sintering machine trolley, and control material
Layer is with a thickness of 500-900mm；Then ignition of sintering process and control sintering machine firing temperature be 950-1200 DEG C, duration of ignition 1-
3min, igniting negative pressure are 3000-10000Pa；
(3) be sintered: after ignition of sintering process, control control sintering negative pressure is 6000-20000Pa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811598611.5A CN109402384A (en) | 2018-12-26 | 2018-12-26 | A method of sintering reduces NOx |
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| CN201811598611.5A CN109402384A (en) | 2018-12-26 | 2018-12-26 | A method of sintering reduces NOx |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109735702A (en) * | 2019-03-13 | 2019-05-10 | 山西太钢不锈钢股份有限公司 | A kind of manufacturing method of sinter |
| CN110904332A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Reinforced ammonia spraying denitration method based on iron ore pellet surface catalytic performance |
| CN111549217A (en) * | 2020-06-09 | 2020-08-18 | 南开大学 | Iron ore sintering method capable of simultaneously improving mechanical performance of sintering ore and reducing emission of nitrogen oxides |
| CN112080632A (en) * | 2020-09-25 | 2020-12-15 | 湖南华菱湘潭钢铁有限公司 | Sintering method of super-thick material layer sintering ore |
| CN114350941A (en) * | 2022-01-13 | 2022-04-15 | 鞍钢股份有限公司 | Method for sintering iron ore by using Ti-Fe as nitrogen fixing agent |
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| US4082539A (en) * | 1975-04-02 | 1978-04-04 | Nippon Steel Corporation | Method for the preliminary treatment of materials for sintering |
| JPH0285324A (en) * | 1988-09-21 | 1990-03-26 | Nisshin Steel Co Ltd | Operating method for sintering low in nox |
| CN101033503A (en) * | 2007-04-06 | 2007-09-12 | 中国科学院过程工程研究所 | Method of eliminating NOx in metallurgy sintering process |
| CN104313308A (en) * | 2014-11-21 | 2015-01-28 | 攀钢集团攀枝花钢钒有限公司 | Iron ore low-carbon sintering method |
| CN105087906A (en) * | 2015-08-27 | 2015-11-25 | 中南大学 | Method for reducing NOx emission in iron ore sintering process |
| CN106521144A (en) * | 2016-11-08 | 2017-03-22 | 首钢总公司 | Method and system for reducing content of CO and nitric oxide in sintering waste gas |
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- 2018-12-26 CN CN201811598611.5A patent/CN109402384A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082539A (en) * | 1975-04-02 | 1978-04-04 | Nippon Steel Corporation | Method for the preliminary treatment of materials for sintering |
| JPH0285324A (en) * | 1988-09-21 | 1990-03-26 | Nisshin Steel Co Ltd | Operating method for sintering low in nox |
| CN101033503A (en) * | 2007-04-06 | 2007-09-12 | 中国科学院过程工程研究所 | Method of eliminating NOx in metallurgy sintering process |
| CN104313308A (en) * | 2014-11-21 | 2015-01-28 | 攀钢集团攀枝花钢钒有限公司 | Iron ore low-carbon sintering method |
| CN105087906A (en) * | 2015-08-27 | 2015-11-25 | 中南大学 | Method for reducing NOx emission in iron ore sintering process |
| CN106521144A (en) * | 2016-11-08 | 2017-03-22 | 首钢总公司 | Method and system for reducing content of CO and nitric oxide in sintering waste gas |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109735702A (en) * | 2019-03-13 | 2019-05-10 | 山西太钢不锈钢股份有限公司 | A kind of manufacturing method of sinter |
| CN110904332A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Reinforced ammonia spraying denitration method based on iron ore pellet surface catalytic performance |
| CN110904332B (en) * | 2019-11-13 | 2021-05-14 | 鞍钢集团矿业有限公司 | Reinforced ammonia spraying denitration method based on iron ore pellet surface catalytic performance |
| CN111549217A (en) * | 2020-06-09 | 2020-08-18 | 南开大学 | Iron ore sintering method capable of simultaneously improving mechanical performance of sintering ore and reducing emission of nitrogen oxides |
| CN112080632A (en) * | 2020-09-25 | 2020-12-15 | 湖南华菱湘潭钢铁有限公司 | Sintering method of super-thick material layer sintering ore |
| CN114350941A (en) * | 2022-01-13 | 2022-04-15 | 鞍钢股份有限公司 | Method for sintering iron ore by using Ti-Fe as nitrogen fixing agent |
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Application publication date: 20190301 |