CN105063345B - H in gas is sintered under the conditions of flue gas recirculation at high proportion2O (g) control method - Google Patents
H in gas is sintered under the conditions of flue gas recirculation at high proportion2O (g) control method Download PDFInfo
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- CN105063345B CN105063345B CN201510533920.4A CN201510533920A CN105063345B CN 105063345 B CN105063345 B CN 105063345B CN 201510533920 A CN201510533920 A CN 201510533920A CN 105063345 B CN105063345 B CN 105063345B
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- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses H in sintering gas under the conditions of a kind of flue gas recirculation at high proportion2O (g) control method, is divided into afterbody, middle part, the part of head three by the flue gas that sintering machine is discharged, 30% ~ 35%, 30% ~ 35%, the 30% ~ 40% of sintering machine length is accounted for successively；Under the conditions of flue gas recirculation at high proportion, by the way that sinter bed is divided into upper and lower two layers, before upper materials igniting, plus one, sealing petticoat pipe importing hot blast is heated to lower floor's material, the crystallization water and Free water in the lower floor of removing in advance material, reduce the H of flue gas in the middle part of the sintering machine for circulation2O (g) contents so that enter H in sintering charge level gas2O (g) volumn concentrations are less than 8%, meet requirement of the sintering of flue gas recirculation at high proportion to GAS QUALITY；Wherein described flue gas recirculation at high proportion refers to the low SO of sintering machine afterbody2Flue gas and middle part flue gas recirculation are to sintering charge level, and flue gas recirculation ratio is 50% ~ 60%.
Description
Technical field
The invention belongs to the sintering industry of field of steel metallurgy, it is related to a kind of agglomeration for iron mine at high proportion during flue gas recirculation
H2O (g) control method.
Background technology
Agglomeration for iron mine is the important procedure of steel manufacture process, and high-quality furnace charge is provided for blast furnace ironmaking.But due to sintering tool
The features such as complexity, process high temperature are constituted by raw material so that it is also typical high energy consumption, maximum discharge, height in Steel Production Flow Chart
Pollution section.The exhaust gas volumn of sintering circuit discharge accounts for the 40% of iron and steel enterprise's total amount, and contains COx, SOx, NOx etc. in flue gas
Multiple pollutant.Therefore, the discharge of sintering process greenhouse gases and dusty gas is reduced, the sustainable development to steel and iron industry has
There is important meaning.
Foreign countries begin one's study in 20 end of the centurys is recycled part high temperature sintering flue gas recirculation to sintering machine first half
Method, to reduce exhaust-gas treatment cost, using the waste heat for sintering flue gas, the peaceful steel of China, Sha Gang etc. have also built this in recent years
Class handling process.When flue gas recirculation is to sinter bed, the dust fractions in flue gas can be adsorbed and be stranded in sinter bed, cigarette
NOx in gas can be pyrolyzed at high temperature by Partial digestion , bioxin；The compound such as CO, CH in flue gas is sintered simultaneously
Second-time burning heat release occurs in journey, it is possible to decrease solid burnup, further reduce NOx, SO2 etc. discharge.Therefore, flue gas recirculation pair
Pollutant has significant comprehensive emission reduction effect.
Flue gas recirculation technique compares normal sintering, and its gas composition for entering sinter bed can change, when flue gas is followed
When ring ratio is high, sintering process can be adversely affected.The ratio of current flue gas recirculation is mostly left 35% generally than relatively low
It is right.When flue gas recirculation ratio continues to improve, H in circulating flue gas2O (g) contents can be improved rapidly, import the H of charge level2O (g) exists
Bottom bed of material condensation, causes bed of material overly moist and influences sintering process gas permeability, cause sintering velocity slack-off, sintering deposit quality is disliked
Change.Therefore, flue gas recirculation reduces sintering production efficiency and sintering deposit quality at high proportion.
The content of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art there is provided a kind of flue gas recirculation condition at high proportion
H in lower sintering gas2O (g) control method so that the H in circulating flue gas under the conditions of 50% ~ 60% high circulation ratio2O (g) contents
8% can be less than, sintering is met to H2The requirement of O (g) contents.
In order to solve the above technical problems, technical scheme proposed by the present invention is：
H in sintering gas under the conditions of a kind of flue gas recirculation at high proportion2O (g) control method, the flue gas that sintering machine is discharged
It is divided into afterbody, middle part, the part of head three, 30% ~ 35%, 30% ~ 35%, the 30% ~ 40% of sintering machine length is accounted for successively；In cigarette at high proportion
Under gas cycling condition, by the way that sinter bed is divided into upper and lower two layers, before upper materials igniting, plus one, sealing petticoat pipe imports heat
Wind is heated to lower floor's material, the crystallization water and Free water in the lower floor of removing in advance material, reduces the sintering machine for circulation
The H of middle part flue gas2O (g) contents so that enter H in sintering charge level gas2O (g) volumn concentrations are less than 8%, meet at high proportion
Flue gas recirculation sinters the requirement to GAS QUALITY；Wherein described flue gas recirculation at high proportion refers to the low SO of sintering machine afterbody2Flue gas
With middle part flue gas recirculation to sintering charge level, flue gas recirculation ratio is 50% ~ 60%.
Above-mentioned control method, it is preferred that lower floor's material thickness in the sinter bed accounts for whole sintering material layer thickness
20% ~ 40%.
Above-mentioned control method, it is preferred that by the high SO in sintering machine head flue gas and afterbody2Flue gas（Account for total sintering machine
Length 10%）Discharged after removing dust, desulfurization, remaining flue gas is used to circulate.The high SO of afterbody2, low SO2The interception of flue gas, is according to cigarette
SO in gas2Emission equivalent, by SO2The flue gas of concentration highest 10% is defined as high SO2Flue gas.
Above-mentioned control method, it is preferred that the hot blast is heated to lower floor's material, refers to that by temperature be 350 ~ 550
DEG C hot gas imported into sealing petticoat pipe in, wherein the length of the sealed cigarette cover accounts for the 4% ~ 8% of sintering machine total length, petticoat pipe is located at
Before sintering device handpiece igniting petticoat pipe.
The present invention is by studying H in circulating flue gas2Influence of O (g) contents to sintering show, H2O (g) contents no more than
8%, it otherwise can cause obvious bed of material overly moist.But when flue gas recirculation ratio is 50 ~ 65%, H in circulating flue gas2O (g) contents are basic
All more than 10%, the maximum allowed more than sintering.Therefore, for the sintering of flue gas recirculation at high proportion, circulating flue gas is reduced
In H2O (g) contents are most important to sintering process.The present invention is by regulating and controlling H2The rule that O (g) is discharged into flue gas makes circulation
H in flue gas2O (g) contents are less than 8%, and combine rational flue gas recirculation pattern so that on the premise of sintering index is not influenceed,
Realize that flue gas recirculation ratio reaches 50% ~ 60%, so as to be conducive to being greatly decreased the discharge capacity of flue gas and the discharge of pollutant.
Compared with prior art, the advantage of the invention is that：
（1）The present invention removes its part moisture, can regulate and control sintering machine stage casing cigarette by heat-agglomerating bed of material lower floor material
H in gas2O (g) content, it enters the H of sintering machine stage casing flue gas2O (g) thick, Hot-blast Heating condition can carry out spirit by lower layered material
Control living, thus the sintering of flue gas recirculation at high proportion under the conditions of various iron ore raw materials is adapted to extensively.
（2）Sintering overly moist phenomenon is mainly moisture and condenses and is formed in the bottom bed of material, of the invention by by lower floor's material water
Divide partial removal, reduce the moisture in material, can further avoid the overly moist of flue gas recirculation sintering process at high proportion
Phenomenon.
（3）The present invention is from Sources controlling H2O (g) discharges to regulate and control the H in circulating flue gas2O (g) contents, it is direct compared to flue gas
Remove H2O (g) method, has the advantages that equipment is simple, nimble without extra process expense, operation, and be suitable for old factory's transformation
Or the construction of new factory, the implementation sintered to flue gas recirculation at high proportion and popularization are significant.
Brief description of the drawings
Fig. 1 is H in sintering gas under the conditions of the present invention at high proportion flue gas recirculation2O (g) control method schematic diagrames.
Marginal data：1-sintering machine, 2-distribution device, 3-hot blast petticoat pipe, 4-igniting petticoat pipe, 5-circulation petticoat pipe,
6-upper materials, 7-lower floor material, 8-head flue gas, 9-middle part flue gas, 10-afterbody high-sulfur flue gas, 11-afterbody low-sulfur
Flue gas, the 12-the first air exhauster, the 13-the first deduster, the 14-the second deduster, the 15-the second air exhauster, 16-flue gas desulfurization
Device, 17-outer smoke evacuation chimney.
Embodiment
For the ease of understanding the present invention, more complete is made to the present invention below in conjunction with Figure of description and preferred embodiment
Face, meticulously describe, but protection scope of the present invention is not limited to embodiment in detail below.
Unless otherwise defined, the implication that all technical terms used hereinafter are generally understood that with those skilled in the art
It is identical.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to the limitation present invention
Protection domain.
Except there is a special instruction, the various reagents used in the present invention, raw material be can be commercially commodity or
Person can pass through product made from known method.
H in sintering gas under the conditions of flue gas recirculation at high proportion of the invention2O (g) control methods schematic diagram is as shown in figure 1, logical
Cross distribution device 2 and carry out cloth, before the igniting of upper materials 6, hot blast petticoat pipe is set before the head igniting petticoat pipe 4 of sintering machine 1
3, import hot blast and lower floor's material 7 is heated, part moisture is removed to head flue in advance, and moisture removal is reduced in
Portion's flue.By middle part flue gas 9 and afterbody low-sulfur flue gas 11 after the first deduster 13, circulation cigarette is imported into by the first air exhauster 12
Cover 5；And head flue gas 8 and afterbody high-sulfur flue gas 10 are after the second deduster 14, the second air exhauster 15, then in flue gas desulfurization device
Handle, finally discharged by outer smoke evacuation chimney 17 in 16.
Embodiment 1：
H in gas is sintered under the conditions of a kind of flue gas recirculation at high proportion of the invention2O (g) control method, its concrete operations
Mode is as follows：
By cloth by sinter bed be divided into above and below two layers（Raw materials for sintering condition：According to mixing iron ore 61.22%, dolomite
5.01%th, lime stone 2.33%, quick lime 4.51%, sinter return fine 23.08%, the quality of coke powder 3.85% compare dispensing（Obtain sintering deposit
Main chemical compositions are：TFe57.7%、SiO24.9%、R2.0、MgO1.8%））, lower floor's material thickness accounts for whole sintering feed thickness
The 20% of degree.Before upper materials igniting, plus one, sealing petticoat pipe importing hot blast is heated to lower floor's material, and hot blast temperature is 550
DEG C, the length of hot blast petticoat pipe accounts for the 4% of sintering machine total length.The method of flue gas recirculation is at high proportion：The tail flue gas of sintering machine is accounted for
The 30% of flue gas cumulative volume is sintered, middle part flue gas accounts for the 30% of sintering flue gas cumulative volume, and head flue gas accounts for sintering flue gas cumulative volume
40%；By middle part flue gas（30%）With the low SO of afterbody2Flue gas（I.e. 30% deducts 10% high SO2Flue gas, accounts for 20%）Circulated, total follows
Ring ratio is 50%；And head flue gas（40%）With the high SO of 10% afterbody2Discharged after flue gas removing dust, desulfurization.It is in circulation ratio
Under conditions of 50%, by H in circulating flue gas in the present embodiment2O (g) contents are reduced to 7.4% from 12.6%, meet sintering to circulation
Flue gas H2The requirement of O (g) contents.
Embodiment 2：
H in gas is sintered under the conditions of a kind of flue gas recirculation at high proportion of the invention2O (g) control method, its concrete operations
Mode is as follows：
By cloth by sinter bed be divided into above and below two layers（Raw materials for sintering condition：According to mixing iron ore 61.41%, dolomite
5.61%th, lime stone 2.05%, quick lime 3.85%, sinter return fine 23.08%, the quality of coke powder 4.00% compare dispensing（Obtain sintering deposit
Main chemical compositions are：TFe58.33%、SiO25.0%、R1.9、MgO2.3%））, lower floor's material thickness accounts for whole sintering feed thickness
The 40% of degree.Before upper materials igniting, plus one, sealing petticoat pipe importing hot blast is heated to lower floor's material, and hot blast temperature is 350
DEG C, the length of hot blast petticoat pipe accounts for the 8% of sintering machine total length.The method of flue gas recirculation is at high proportion：The tail flue gas of sintering machine is accounted for
The 35% of flue gas cumulative volume is sintered, middle part flue gas accounts for the 35% of sintering flue gas cumulative volume, and head flue gas accounts for sintering flue gas cumulative volume
30%；By middle part flue gas（35%）With the low SO of afterbody2Flue gas（I.e. 35% deducts 10% high SO2Flue gas, accounts for 25%）Circulated, total follows
Ring ratio is 60%；And head flue gas（30%）With the high SO of 10% afterbody2Discharged after flue gas removing dust, desulfurization.It is in circulation ratio
Under conditions of 60%, by the present invention, by H in circulating flue gas2O (g) contents are reduced to 6.9% from 14.8%, meet sintering to circulation
Flue gas H2The requirement of O (g) contents.
Claims (1)
1. H in sintering gas under the conditions of a kind of flue gas recirculation at high proportion2O (g) control method, it is characterised in that arrange sintering machine
The flue gas gone out is divided into afterbody, middle part, the part of head three, and 30%~35%, 30%~35%, the 30% of sintering machine length is accounted for successively
~40%；Under the conditions of flue gas recirculation at high proportion, by the way that sinter bed is divided into upper and lower two layers, before upper materials igniting, plus
One sealing petticoat pipe imports hot blast and lower floor's material is heated, the crystallization water and Free water in the lower floor of removing in advance material, reduces
H for flue gas in the middle part of the sintering machine of circulation2O (g) contents so that enter H in sintering charge level gas2O (g) volumn concentrations
Less than 8%；Wherein described flue gas recirculation at high proportion refers to the low SO of sintering machine afterbody2Flue gas and middle part flue gas recirculation are to sintering feed
Face, flue gas recirculation ratio is 50%~60%；
Lower floor's material thickness in the sinter bed accounts for the 20%~40% of whole sintering material layer thickness；
By the high SO in sintering machine head flue gas and afterbody2Discharged after flue gas removing dust, desulfurization, remaining flue gas is used to circulate；It is described
The high SO of afterbody2Flue gas refers to SO2Concentration highest accounts for the part flue gas of sintering machine length 10%；
The hot blast is heated to lower floor's material, refers to temperature importeding into sealing petticoat pipe for 350~550 DEG C of hot gas,
The length of wherein described sealed cigarette cover accounts for the 4%~8% of sintering machine total length, petticoat pipe be located at sintering device handpiece igniting petticoat pipe it
Before.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510533920.4A CN105063345B (en) | 2015-08-27 | 2015-08-27 | H in gas is sintered under the conditions of flue gas recirculation at high proportion2O (g) control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510533920.4A CN105063345B (en) | 2015-08-27 | 2015-08-27 | H in gas is sintered under the conditions of flue gas recirculation at high proportion2O (g) control method |
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| CN105063345B true CN105063345B (en) | 2017-07-21 |
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| CN107983154B (en) * | 2017-11-28 | 2020-01-07 | 中南大学 | Parallel-connection-type double-tower desulfurization and denitrification process for sintering flue gas activated carbon |
| CN112161484A (en) * | 2020-09-23 | 2021-01-01 | 昆明理工大学 | Recycling method of iron ore sintering gas |
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| JP4054505B2 (en) * | 2000-02-29 | 2008-02-27 | 株式会社神戸製鋼所 | Exhaust gas circulation method sintering operation method |
| JP2003302169A (en) * | 2002-04-11 | 2003-10-24 | Jfe Steel Kk | Sintered mineral cooler |
| CN103499216B (en) * | 2013-09-26 | 2015-04-08 | 中南大学 | Iron mine sintering flue gas segmented circulation method |
| CN104513897A (en) * | 2014-12-19 | 2015-04-15 | 中南大学 | Iron ore sintering method with ultrahigh-proportion flue gas circulation |
| CN104748567B (en) * | 2015-03-27 | 2017-02-22 | 中国科学院过程工程研究所 | Sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system |
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