CN105861816B - A kind of sintering process SO based on addition solid inhibitor2, bioxin cooperates with discharge-reducing method - Google Patents
A kind of sintering process SO based on addition solid inhibitor2, bioxin cooperates with discharge-reducing method Download PDFInfo
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- CN105861816B CN105861816B CN201510033238.9A CN201510033238A CN105861816B CN 105861816 B CN105861816 B CN 105861816B CN 201510033238 A CN201510033238 A CN 201510033238A CN 105861816 B CN105861816 B CN 105861816B
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Abstract
The invention discloses a kind of sintering process SO based on addition solid inhibitor2, bioxin cooperates with discharge-reducing method, belongs to pollution reduction technical field in sintering process.The present invention step be：Step one：Sintering feed, (A) mats formation the shop fixtures bed of material on the top of pallet；(B) dress paving first mixes the bed of material above the shop fixtures bed of material；(C) the Ammonia inhibitor particle of solid is mixed with sinter mixture, the dress paving collaboration emission reduction bed of material above the first mixing bed of material；(D) dress paving second mixes the bed of material above the collaboration emission reduction bed of material；Step 2：Fume centralized collection is handled, and the flue gas in the bellows of pallet postmedian is imported into sack cleaner through booster pump, the flue gas after dedusting introduces flue collector by pipeline.The present invention is by the way that urea granules are added in the collaboration emission reduction bed of material, so as on the premise of sinter quality is basically unchanged, realize sintering process SO2The collaboration emission reduction of, bioxin, significantly reduces the emission reduction burden of iron and steel enterprise.
Description
Technical field
It is solid based on addition more specifically to one kind the present invention relates to pollution reduction technical field in sintering process
The sintering process SO of body inhibitor2, bioxin cooperates with discharge-reducing method.
Background technology
Sintering circuit is the important procedure that integrated iron and steel works produce chain, with the fast development of steel and iron industry, to iron ore
The required amount of stone is increasing.However, the rich ore for directly entering stove ironmaking is fewer and fewer, it is necessary to a large amount of to exploit and provided using lean ore
Source.Lean ore, which directly enters stove, which to be smelted, can deteriorate blast fumance index.Therefore, lean ore obtains fine ore by ore dressing processing.Concentrate
The fine ore produced with rich ore in exploitation and process, needs that blast furnace ironmaking could be used for after agglomeration.And the effect of sintering machine is just
It is that agglomeration is carried out to fine ore.The metallurgical performance of sintered mineral is greatly improved, and huge economic benefit is brought to blast fumance.
Moreover, sintering process is very strong to the adaptability of raw material, not only sintering deposit can be produced with the thicker rich ore powder of granularity and fine ore, together
When can also handle industrial ferrous contained discarded object.
However, sintering process is provided for blast furnace while well entering stove ore deposit, huge environmental pollution is also brought.Wherein,
SO2It is one of important pollutant in sintering process, the SO arranged outside sintering circuit2Account for SO in steel production2Total emission volumn
85%.Sintering desulfuration method of the prior art, mainly to the end treatment for sintering flue gas, is broadly divided into dry method, semidry method
And wet method, although it is most of effectively to remove SO2, still, its investment cost and operating cost are huge, are also easy to produce secondary pollution,
And be the Absorption Desulfurization method of Single Pollution thing, it is difficult to realize the collaboration emission reduction of multiple pollutant.Therefore, existing dirt is reformed
Contaminate thing discharge-reducing method imperative.
In addition, except SO2Outside , bioxin be another most important pollutant；Compared to SO2, bioxin to human health and
Natural environment harm is bigger, is difficult degraded in natural environment, being capable of long-distance migration in the world.Bioxin is once arranged
Put in atmosphere, it is difficult to which natural degradation is eliminated, its toxicity is 130 times of cyanide, 900 times of arsenic, is had " poison in century "
Title；It is difficult to decompose after being taken in by organism, and concentrates amplification along food chain, endangers huge to human and animal, it is not
Only there is carcinogenic, teratogenesis, mutagenicity, but also with endocrine.Research shows, persistence organic pollutant pair
The influence of the mankind can continue several generations, and significant threat is constituted to human survival, procreation and sustainable development.
Sintering circuit is to produce the more production unit of dioxin pollutant, and sintering produces bioxin and accounts for total displacement
17.6%.Sinter mixture is distributed on pallet, and as chassis is slowly moved after being lighted through ignition furnace, air is from top to bottom
By the bed of material, the compound in burning zone is sintered or melted by the heat energy produced that burns.It is anti-that sintering possesses de novo formation de novo
The most of condition answered：(1) chlorine comes from organic chlorine component in reclaimed dust, clinker and iron ore；(2) carbon source is in carbon
Fiber, lignin, coke, vinyl etc.；(3) graphite-structure with deformation and omission, butter, copper and ferrous metal
Ion, is used as catalyst；(4) oxidizing atmosphere, temperature is 250-450 DEG C.
In addition, during iron and steel enterprise's production sintering deposit, the solid in enterprise has been recycled due to raw materials for sintering
Discarded object (such as steel-making OG mud, blast furnace ash etc.), therefore sintering process has inevitably reclaimed part heavy metal, such as heavy metal
Cu, Pt, Zn, Hg etc., and exactly bioxin predecessor (such as polystream phenol and diphenyl ether) generation two of these heavy metals (such as Cu)
Catalytic action is played in the reaction of Evil English, the generation of bioxin is promoted.Moreover, the low temperature reduction degradation to reduce sintering deposit
Rate, often sprays CaCl on finished product sintering deposit2Weak solution, although reached the purpose for improving Metallurgical Properties of Sinter, but together
When also provide " chlorine source " for the generation of sintering process Zhong bioxin, be that its generation creates material conditions.In Europe, iron ore burns
Knot is considered as the second largest toxic pollutant emission source for being only second to city garbage incinerator.Moreover, China on November 4th, 2010
Special issue《Instruction on Jia Qiang bioxin prevention and cure of pollution》, " 12 " Qi Jian bioxin is as priority control pair
As.Therefore, promote sintering process Zhong bioxin emission-reduction technologies imperative.
Through patent retrieval, some related technical scheme is disclosed, such as：One kind sintering flue gas scrubbing CO_2 and
The device and method (CN201110173596.1) of bioxin, agglomerates of sintered pellets flue gas desulfurization and denitrification collaboration governing system and technique
(CN201410072049.8) a kind of, dust removal integrated equipment of sintering flue gas desulfurization Tuo bioxin for not setting electric precipitation
(CN201310713790.3) etc.；Although above-mentioned technical proposal can realize SO2The synchronous emission reduction of, bioxin, but above-mentioned technology
Scheme belongs to end treatment, is big exhaust gas volumn, the absorption emission reduction of low content, does not realize online in sintering process
Pollution reduction so that the investment of pollution reduction, operating cost are huge so that iron and steel enterprise is to pollution reduction prestige
Step, significantly increases the emission reduction burden of enterprise, and emission reduction product easily produces secondary pollution.
It in addition, there will be on SO online in sintering process2The related technical scheme of emission reduction is disclosed：For in sintering process
On-line desulphurization method (CN99111573.2), based on addition inhibitor desulfurizing method in iron ore sintering process
(CN201110022407.0), a kind of on-line desulphurization method (CN201410109130.9) of sintering process etc.；Above-mentioned technical side
Case realizes the on-line desulphurization in sintering process by adding Ammonia material in sinter bed.It is online on sintering process
Bioxin emission reductions, also have related technical scheme and disclose：The discharge-reducing method of iron ore sintering process bioxin
(CN201110180658.1), a kind of novel energy-saving emission-reducing sintering machine system and sintering method (CN201310167718.5) etc.,
Above-mentioned technical proposal is used as bioxin formation inhibitor and realized in sintering process by adding Ammonia material in sinter bed
In bioxin emission reductions.Above-mentioned published technical scheme, proposes the addition scheme of three kinds of Ammonia inhibitor, (1) presses down Ammonia
All mixing is added in sinter bed preparation, and (2) add Ammonia inhibitor at a certain height of sinter bed, and (3) are by ammonia
Class inhibitor is sprayed on the sintered compound bed of material.
Anhui University of Technology is directed to the research of pollution reduction in sintering process always, is ground by scientific experiment for many years
Study carefully discovery：, there is following technology drawback in three kinds of above-mentioned technical schemes：
(1) addition of Ammonia inhibitor is extremely micro relative to the quality of sinter mixture, if Ammonia pressed down
Preparation is mixed to join in sinter mixture, necessarily causes the no specific aim of addition of Ammonia inhibitor, on the one hand, if added
Ammonia inhibitor amount it is less, then the emission reduction effect that can be substantially reduced so that emission reduction is not thorough, on the other hand, if add
Amount is excessive, not only considerably increases the consumption of urea, increases emission reduction cost, and is also easy to produce secondary pollution, and urea plus
The quality of sintering deposit can be had a strong impact on by entering amount；
(2) addition of Ammonia inhibitor is extremely micro relative to the quality of sinter mixture, if Ammonia pressed down
Preparation is added at a certain height, and fluctuation is easily produced during due to cloth, causes to be difficult to being added to urea granules into the height specified
Degree so that the desulfurized effect of urea is deteriorated, and complicated and changeable due to sintering process, the moisture of sinter mixture, fuel content,
Property of raw material all can produce large effect to sintering process, so that sintering process produces larger fluctuation, if by Ammonia
Inhibitor is added at the certain height of sinter bed, easily causes emission reduction effect to produce fluctuation；Further, since flue gas is in cooling
During, constantly there is bioxin generation, if inhibitor is simply added into a certain height in the sintered compound bed of material so that flue gas
By sintering after a height, temperature range of the flue-gas temperature still in generation bioxin, it is difficult to realize the emission reduction of bioxin；
(3) in sintering process, if urea is dissolved in into water and adds full compound sintering deposit all technical can be caused to become
Difference, and decline with the increase of urea addition, the quality influence on sintering deposit is larger, directly affects the matter into stove ore
Amount, has a strong impact on smooth operation of furnace.
Above-mentioned technical scheme, although realize the online emission reduction of pollutant sintering process, but be all Single Pollution thing
Specific emission reduction, it is impossible to realize SO2The collaboration emission reduction of He bioxin；And due to SO in sintering process2The manufacturing machine of He bioxin
Reason, formation zone, emission reduction condition differ widely, and the complexity of sintering process in addition, sintered in sintering process each
Layer all constantly changes so that existing technical scheme is difficult to the SO in sintering process2The collaboration emission reduction of He bioxin.
If realizing the SO of sintering process2The collaboration emission reduction of, bioxin, is not the simple superposition of discharge-reducing method
Realize SO in sintering process2The collaboration emission reduction of, bioxin, just because of the difficulty of collaboration emission reduction so that prior art is difficult to gram
Clothes SO online in sintering process2, bioxin cooperates with the technical bottleneck of emission reduction.
Applicant is by long-time, a series of scientific research before this, and creative proposition is in the sintered compound bed of material
It is middle that the collaboration emission reduction bed of material is set, and Ammonia inhibitor is added in the collaboration emission reduction bed of material, so as to realize the SO in sintering process2、
Bioxin cooperates with emission reduction, and patent applied for：A kind of sintering process SO2, bioxin cooperates with discharge-reducing method and system (Chinese patent
Application number：201410592066.4)；But, urea adds sinter bed as a solution, and its technical process is more complicated,
Emission reduction efficiency needs further raising.
In addition, existing online emission reduction schedule, only proposes the discharge-reducing method of a sintering flue gas pollutant, but
It is due to that emission reduction product is extremely tiny, if carrying out dedusting using deduster, will certainly causes to produce pressure during sintering exhausting
Damage, cause air quantity imbalance in sintering process so that sintering production is unstable, and has a strong impact on sintering production.Existing technology
Scheme so that the product that Ammonia inhibitor is produced after being combined with pollutant is difficult to be collected, causes the product after emission reduction to obtain not
To collection, it is impossible to which the sintered product of online emission reduction is handled so that emission reduction turns into " half " engineering, only by dirt
Dye thing is alternatively discharged into air, is not carried out the substantive emission reduction of pollutant.
The content of the invention
1. the invention technical problem to be solved
It is an object of the invention to overcome in the prior art, sintering flue gas pollutant emission-reduction technology belongs to end treatment, and
It is difficult in sintering process realize SO2There is provided a kind of burning based on addition solid inhibitor for the deficiency of, bioxin collaboration emission reduction
Knot process SO2, bioxin cooperates with discharge-reducing method, on the premise of the quality for ensureing sintering deposit is substantially unaffected, realizes burning
The online SO of knot process2The collaboration emission reduction of, bioxin.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of sintering process SO based on addition solid inhibitor of the present invention2, bioxin cooperates with discharge-reducing method, specifically
Step is as follows：
Step one：Sintering feed
(A) mat formation on the top of pallet the shop fixtures bed of material；
(B) sinter mixture is mated formation in the top of the shop fixtures bed of material, forms first and mix the bed of material；
(C) the Ammonia inhibitor particle of solid is mixed with sinter mixture, the Ammonia inhibitor particle of solid
Addition is the 0.04%-0.11% of sinter bed gross mass, then spreads the sinter mixture for being mixed with solid Ammonia inhibitor
The collaboration emission reduction bed of material is formed above the first mixing bed of material；
(D) sinter mixture is mated formation above the collaboration emission reduction bed of material again, forms second and mix the bed of material；
Step 2：Fume centralized collection is handled
Down draft sintering is carried out after igniting, during sintering machine down draft sintering, by the bellows of pallet postmedian
Interior flue gas imports sack cleaner through booster pump, and the boost pressure of described booster pump is 0.8-1.0KPa, and control cloth bag is removed
Wind speed in dirt device is 0.75-0.85m/mim, and the sintering flue gas after sack cleaner dedusting introduces sintering machine main cigarette by pipeline
Road.
Further, the distance of described collaboration emission reduction bed of material distance from bottom pallet is sinter bed total height
1/10-1/8, the thickness of the collaboration emission reduction bed of material is the 1/8-1/5 of sinter bed total height.
Further, the solid Ammonia inhibitor in the described collaboration emission reduction bed of material is urea granules；Described collaboration
The weight/mass percentage composition of carbon-containing fuel in the emission reduction bed of material is 3.5%-5.0%, the matter of the CaO in the described collaboration emission reduction bed of material
Amount percentage composition is 4.5%-6.0%.
Further, the average grain diameter of described urea granules is 0.30-0.50mm.
Further, the bellows of described postmedian are lower section correspondence at pallet length direction 1/2-3/4 positions
Bellows.
3. beneficial effect
The technical scheme provided using the present invention, compared with existing known technology, with following remarkable result：
A kind of sintering process SO based on addition solid inhibitor of the present invention2, bioxin cooperates with discharge-reducing method, creative
Proposition by the sinter mixture for being mixed with solid Ammonia inhibitor particle mat formation first mixing the bed of material above formed collaboration emission reduction
The bed of material, and the average grain diameter of Ammonia inhibitor particle is 0.30-0.50mm, and creative have adjusted in the collaboration emission reduction bed of material
Carbon-containing fuel and CaO content, collaboration emission reduction band one wider is formed in sinter bed so that sintering flue gas is in cooling
During suppress bioxin generation, until sintering flue-gas temperature be reduced to below bioxin synthesis temperature, and suppress two
While Evil English is generated, the SO of excessive moistening layer is gathered in2Reacted with urea so that collaboration emission reduction band covers the production of bioxin
Generating layer and the active position of desulfurization；So as to which breakthrough realizes online SO in sintering process2The collaboration of, bioxin subtracts
Row, and the normal production of sintering work is ensure that, overcome the technology disadvantage of Single Pollution thing end-o f-pipe -control of the prior art
End, greatly reduces the cost of sintering process pollution reduction, alleviates the emission reduction burden of iron and steel enterprise；Moreover, Ammonia presses down
Preparation is added in sinter mixture in the form of granules, it is ensured that all technical of sintering process is substantially unaffected,
The online multiple pollutant of a kind of high efficiency, the sintering process of low cost, which is provided, for iron and steel enterprise cooperates with emission-reduction technology；
In addition, the proposition of the invention is focused on the flue gas in the bellows of pallet postmedian, and
And the flue gas after bag-type dust is imported into flue collector through booster pump, it is ensured that and the balance of air quantity in sintering process, so as to ensure that
The steady production of sintering process.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the distribution device of the collaboration discharge-reducing method of the present invention；
Fig. 2 is the cloth schematic diagram for cooperateing with discharge-reducing method of the invention；
Fig. 3 is the present invention collaboration asynchronous desulfurization degree of emission reduction thickness of feed layer He bioxin emission reduction efficiency tendency chart.
Label declaration in schematic diagram：
1st, the shop fixtures bed of material；2nd, the first mixing bed of material；3rd, the emission reduction bed of material is cooperateed with；4th, the second mixing bed of material；5th, pallet；
61st, grate-layer material distribution device；62nd, the first mixture distributor device；63rd, emission reduction mixture distributor device；64th, the second compound cloth
Expect device；7th, flue is focused on；8th, flue collector；9th, sack cleaner.
Embodiment
To further appreciate that present disclosure, with reference to embodiment, the invention will be further described.
Embodiment 1
With reference to Fig. 1, Fig. 2 and Fig. 3, a kind of sintering process SO based on addition solid inhibitor of the present embodiment2, bioxin
Cooperate with discharge-reducing method, described distribution device is arranged on the top of pallet 5, and the top of pallet 5 is disposed with paving
Bed material distribution device 61, the first mixture distributor device 62, emission reduction mixture distributor device 63, the second mixture distributor device 64
(as shown in Figure 1), wherein：Described grate-layer material distribution device 61 is used for the shop fixtures bed of material 1 of mating formation on the top of pallet 5, described
The first mixture distributor device 62 be used for sinter mixture of mating formation in the top of the shop fixtures bed of material 1, and form first and mix the bed of material 2,
The gross thickness of the described mixing bed of material 2 of the shop fixtures bed of material 1 and first is 90mm；Described emission reduction mixture distributor device 63 is used for
The top of the first mixing bed of material 2, which is mated formation, is mixed with the sinter mixture of Ammonia inhibitor, and forms the collaboration emission reduction bed of material 3, and the collaboration subtracts
The height of discharge 3 distance from bottom pallet 5 of layer is 90mm, and the thickness of the collaboration emission reduction bed of material 3 is 100mm；Described second mixes
Material distribution device 64 is closed for sinter mixture of mating formation in the top of the collaboration emission reduction bed of material 3, and forms second and mixes the bed of material 4, it is described
The mixing of the shop fixtures bed of material 1, first bed of material 2, the bed of material total height (bed of material total thickness of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second
Degree) it is 800mm.The area of the pallet 5 of the present embodiment is 180m2, there are 14 bellows the lower section of pallet 5, and from sintering
Open numbering at machine head, numbering is 1#To 14#。
The bottom of the pallet 5 of the present embodiment is provided with bellows, wherein at the bellows of the postmedian of pallet 5 and concentration
Manage flue 7 to be connected, the bellows of the postmedian are the corresponding bellows in lower section at the length direction 1/2-3/4 positions of pallet 5, are
The 7 of the lower section of pallet 5 of the present embodiment#To 11#Bellows.
The flue 7 that focuses on of the present embodiment is connected through increasing pump with the entrance point of sack cleaner 9, the sack cleaner
9 filter bag specification is 160 × 6000mm of Φ, and sack cleaner 9 is provided with 800 filter bags, total filter area of the sack cleaner 9
2413m2, filter bag material is the laminating filtrates of PTFE, and the sulfuric acid for generating emission reduction can be realized during bag-type dust is used
Ammonium carries out supplementary set, and emission reduction product is carried out into recycling application, meets the theory turned waste into wealth.Described sack cleaner 9
The port of export is connected with flue collector 8, and the flue gas after bag-type dust is imported into flue collector 8 through booster pump, it is ensured that sintering process
The balance of middle air quantity, so as to ensure that the steady production of sintering process；Described remaining bellows of pallet 5 directly with main cigarette
Road 8 is connected, as the 1 of the present embodiment#To 6#Bellows and 12#To 14#Bellows are directly connected with flue collector 8.
Applicant of the present invention is in order to realize the SO in sintering process2The collaboration emission reduction of He bioxin, has passed through for a long time
A series of explorations；But, due to SO in sintering process2With the production mechanism of bioxin, formation zone, emission reduction condition very much not phase
Together so that existing technical scheme is difficult to the SO in sintering process2The collaboration emission reduction of He bioxin；Wherein in sintering process
Limit SO2He bioxin collaboration emission reduction principal element have it is following some：
(1) formation zone is different：SO in sintering process2Concentration discharge region in burning zone and drying layer, and SO2Concentration
Attached collection is in excessive moistening layer；However, bioxin mainly has two formation zone in sintering process, one is the cooling zone of sintering ore bed,
The second is the drying and preheating layer of sinter bed, particularly drying and preheating layer generation bioxin can not degrade；
(2) temperature conditionss of emission reduction are different：Using urea to SO2During emission reduction, urea and SO2Reaction temperature need be less than
100℃；However, the temperature range for suppressing bioxin generation is 200-800 DEG C；
(3) difference of emission reduction mechanism：Urea is being used to SO2During emission reduction, due to SO2Concentration is gathered in sinter bed more
In narrow and small one layer, it is only necessary to which it is that can be achieved emission reduction targetedly to add urea to one layer of narrow and small progress；However, suppressing
, it is necessary in generation of the flue-gas temperature by the lasting suppression bioxin of 200-800 DEG C of temperature range when bioxin is generated.
Seriously hindered just because of factors above and SO is limited in sintering process2He bioxin cooperates with emission reduction, burns in addition
Each layer sintered in complexity, the fluctuation of knot process, sintering process all constantly changes so that online in sintering process
SO2The emission reduction of He bioxin turns into a great technical bottleneck.
By exploration unremitting for a long time, the creative proposition of final applicant of the present invention will be mixed with Ammonia inhibitor
Sinter mixture is mated formation forms the collaboration emission reduction bed of material 3 in the top of the first mixing bed of material 2, so as to form one in sinter bed
Wider collaboration emission reduction band so that sintering flue gas suppresses the generation of bioxin during cooling, until sintering flue-gas temperature
It is reduced to below bioxin synthesis temperature, and while bioxin generation is suppressed, is gathered in the SO of excessive moistening layer2Sent out with urea
Raw reaction so that collaboration emission reduction band covers the generation layer of bioxin and the active position of desulfurization；Moreover, the present invention improves association
With the content of CaO in the emission reduction bed of material 3, realize that bioxin emission reduction provides a weakly alkaline environment for urea, applicant is surprised
It was found that emission reduction effect is greatly improved；In addition, the present invention improves the content of carbon-containing fuel in the collaboration emission reduction bed of material 3, so as to ensure
The all technical of sintering, is that sintering production is normally carried out providing safeguard, on the premise of sintering quality is ensured, suppresses sintering
The generation of process bioxin, realizes sintering process bioxin emission reductions；And it is gathered in the SO of excessive moistening layer2Occur with urea anti-
Should, so that breakthrough realizes SO online in sintering process2The collaboration emission reduction of, bioxin, overcomes this important technical
Bottleneck.
A kind of sintering process SO of the present invention2, bioxin cooperates with discharge-reducing method, and its specific implementation step is：
Step one：Sintering feed
(A) mated formation using grate-layer material distribution device 61 on the top of pallet 5 grate-layer material, form the shop fixtures bed of material 1；
(B) form first in the top dress paving sinter mixture of the shop fixtures bed of material 1 using the first mixture distributor device 62 and mix
The bed of material 2 is closed, the gross thickness of the shop fixtures bed of material 1 and first mixing bed of material 2 is 90mm；
(C) the Ammonia inhibitor particle of solid is mixed with sinter mixture, the Ammonia inhibitor of wherein solid is
Urea granules, and the average grain diameter of urea granules is 0.30-0.50mm, the addition quality of urea is sinter bed gross mass
0.09%, the sinter mixture for being mixed with urea granules is mated formation using emission reduction mixture distributor device 63 and mixes the bed of material 2 first
Top forms the collaboration emission reduction bed of material 3, and the height of the distance from bottom pallet 5 of the collaboration emission reduction bed of material 3 is 90mm, cooperates with emission reduction material
The thickness of layer 3 is 100mm；
(D) sinter mixture is mated formation in the collaboration emission reduction bed of material 3 top using the second mixture distributor device 64, forms the
The two mixing bed of materials 4；
Step 2：Fume centralized collection is handled
Down draft sintering is carried out after igniting, during sintering machine down draft sintering, by the bellows of the postmedian of pallet 5
Interior flue gas imports and focuses on flue 7, and the flue gas focused in flue 7 imports sack cleaner 9 through booster pump, described
The boost pressure of booster pump is 0.9KPa, and it is 0.80m/mim to control the wind speed in sack cleaner 9, through the dedusting of sack cleaner 9
Sintering flue gas afterwards introduces Main Gas Flue of Sintering Machine 8 by pipeline.
Ammonia inhibitor solution in the collaboration emission reduction bed of material 3 of the present embodiment is the addition of urea liquid, wherein urea
For the 0.09% of sinter bed gross mass, the gross mass of described sinter bed is the mixing of the shop fixtures bed of material 1, first bed of material 2, collaboration
The emission reduction bed of material 3 and second mixes the bed of material quality sum of the bed of material 4.The first mixing mixing bed of material 4 of the bed of material 2 and second of the present embodiment
Sinter mixture in carbon-containing fuel weight/mass percentage composition be 3.2%, the carbon-containing fuel be coke powder, and first mixing the bed of material
2 and second mixing the bed of material 4 sinter mixture in CaO weight/mass percentage composition be 4.2%；The described collaboration emission reduction bed of material 3
In the weight/mass percentage composition of carbon-containing fuel be 4.0%, the carbon-containing fuel is coke powder, the CaO's in the collaboration emission reduction bed of material 3
Weight/mass percentage composition is 5.0%.
After sintering is stable, the SO of flue gas in sintering process is measured in flue collector 82Concentration is calculated He the concentration of bioxin
Desulfurization degree is recorded such as table 1 He the emission reduction efficiency of bioxin, detects the technical indicator of sintering deposit, record such as table 2.
Desulfurization degree=(the SO in benchmarks flue gas2SO after concentration-emission reduction in flue gas2Concentration)/benchmarks flue gas
In SO2Concentration × 100%.
Bioxin emission reduction efficiency=( bioxin is dense in flue gas after bioxin concentration-emission reduction in benchmarks flue gas
Degree) bioxin concentration × 100% in/benchmarks flue gas.
Comparative example 1
This comparative example is that difference is as benchmarks, the sintering process be the same as Example 1 of this comparative example：Collaboration
The thickness of the emission reduction bed of material 3 is zero, that is, is not provided with the collaboration emission reduction bed of material 3, and the only mixing of the shop fixtures bed of material 1, first bed of material 2 and second is mixed
The bed of material 4 is closed, and the bed of material total height (bed of material gross thickness) of the mixing mixing bed of material 4 of the bed of material 2 and second of the shop fixtures bed of material 1, first is
800mm.After sintering is stable, the SO of flue gas in sintering process is measured2The concentration of, bioxin, and record such as table 1, detection sintering deposit
Technical indicator, record is used as the benchmark of later experiments such as table 2.
Comparative example 2
The sintering process be the same as Example 1 of this comparative example, and the addition of the urea of this comparative example, the collaboration emission reduction bed of material 3
Thickness is same as Example 1, and the mixing of the shop fixtures bed of material 1, first bed of material 2, the material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second
Layer total height (bed of material gross thickness) is 800mm, and difference is：Described Ammonia inhibitor is first mixed with water, and dissolving is abundant
Mixed, then the sinter mixture for being mixed with liquid Ammonia inhibitor is mated formation in the first compound with sinter mixture again afterwards
The top of layer 2 forms the collaboration emission reduction bed of material 3.After sintering is stable, the SO of flue gas in sintering process is measured2The concentration of, bioxin, and remember
Record such as table 1, detects the technical indicator of sintering deposit, record such as table 2.
SO in the flue gas of the sintering experiment of table 12, bioxin concentration and emission reduction efficiency
The sintering deposit technical indicator of table 2
Analyzed by the data of Tables 1 and 2, can draw to draw a conclusion：
(1) benchmarks in comparative example 1 are compared, are provided with when between the first mixing mixing bed of material 4 of the bed of material 2 and second
Cooperate with after the emission reduction bed of material 3, no matter Ammonia inhibitor adds in the collaboration emission reduction bed of material 3 in what manner, desulfurization degree all 84% with
The emission reduction efficiency of upper , bioxin is all more than 62%, with significant collaboration emission reduction effect；
(2) when being contrasted comparative example 2 and embodiment 1, find when Ammonia inhibitor is added in the form of solid particle
To collaboration the emission reduction bed of material when (embodiment 1) desulfurization degree be：85.03% , bioxin emission reduction efficiencies are：64.35%, compared to pair
84.44% desulfurization degree of ratio 1 and 62.39% bioxin emission reduction efficiencies, with more preferable emission reduction effect；
(3) using the technical scheme of embodiment 1, applicant has surprisingly found that not only SO2, bioxin cooperates with the efficiency of emission reduction
It is further enhanced, and all technical of sintering deposit is basically unchanged, the quality to sintering deposit has little to no effect, i.e. ammonia
Class inhibitor is when to be added to the collaboration emission reduction bed of material 3 in the form of solid particle, before being basically unchanged ensureing sinter quality
Put, realize SO2The collaboration emission reduction of, bioxin.
Analysis more than is found：SO in flue gas in embodiment 12Concentration (mg/Nm3) by 694.2mg/Nm3It is reduced to
103.9mg/Nm3, emission reduction efficiency reaches bioxin concentration (pg-TEQ/Nm in 85.03%, flue gas3) by 763pg-TEQ/Nm3
It is reduced to 272pg-TEQ/Nm3, emission reduction efficiency reaches 64.35%, reached the standard of National Pollutant emission reduction.Moreover, logical
Cross the analysis to all technical of sintering deposit to find, compared to comparative example 1, all technical of the sintering deposit of embodiment 1
Substantially do not make a difference, it is achieved thereby that on the premise of ensureing that sintering deposit all technical does not change substantially, carrying out
Online SO in sintering process2The collaboration emission reduction of, bioxin, overcomes the significant technology issues for being difficult to cooperate with emission reduction.It is real
The desulfurization degree in a 1-7 is applied He bioxin emission reduction efficiency is as shown in Figure 3.
The present invention sets the collaboration emission reduction bed of material 3 one wider by creative proposition in the sintered compound bed of material, assists
Collaboration is added in the form of solid particle and is subtracted as bioxin formation inhibitor, and urea added with urea with the emission reduction bed of material 3
In discharge layer 3, the average grain diameter of urea is 0.30-0.50mm.In addition, the present invention have adjusted the composition in the collaboration emission reduction bed of material 3
Proportioning so that sintering flue gas suppresses the generation of bioxin during cooling, until sintering flue-gas temperature is reduced to bioxin
Below synthesis temperature, and while bioxin generation is suppressed, it is gathered in the SO of excessive moistening layer2Reacted with urea so that
Collaboration emission reduction band covers the generation layer of bioxin and the active position of desulfurization；Moreover, the invention improves collaboration
CaO content in the emission reduction bed of material 3, is that urea realizes SO2The collaboration emission reduction of, bioxin provides a weakly alkaline environment, significantly
Improve emission reduction effect.
In addition, the appropriate content for improving carbon-containing fuel in the collaboration emission reduction bed of material 3, and creative change technical side
Case, by urea to be added in the form of solid particle in the collaboration emission reduction bed of material 3 so that all technical of sintering deposit is substantially not
Make a difference, be that sintering production is normally carried out providing safeguard so as to ensure all technical of sintering；Moreover, realizing
While sintering process bioxin emission reduction, the SO of excessive moistening layer is gathered in2Reacted with urea so that the SO in sintering flue gas2
To emission reduction, it is achieved thereby that sintering process SO2The collaboration emission reduction of, bioxin, to the clean manufacturing and sustainable development of steel and iron industry
Exhibition is significant.
Embodiment 2
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the thickness of the collaboration emission reduction bed of material 3 is 110mm, and detects SO2The generation of, bioxin
Concentration, and the emission reduction efficiency of desulfurization degree, bioxin is calculated, the desulfurization degree of the present embodiment is the emission reduction efficiency of 86.43% , bioxin
For 65.84%.
Embodiment 3
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the thickness of the collaboration emission reduction bed of material 3 is 120mm, and detects SO2The generation of, bioxin
Concentration, and the emission reduction efficiency of desulfurization degree, bioxin is calculated, the desulfurization degree of the present embodiment is the emission reduction efficiency of 87.29% , bioxin
For 66.71%.
Embodiment 4
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the thickness of the collaboration emission reduction bed of material 3 is 130mm, and detects SO2The generation of, bioxin
Concentration, and the emission reduction efficiency of desulfurization degree, bioxin is calculated, the desulfurization degree of the present embodiment is the emission reduction efficiency of 88.23% , bioxin
For 68.19%.
Embodiment 5
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the thickness of the collaboration emission reduction bed of material 3 is 140mm, and detects SO2The generation of, bioxin
Concentration, and the emission reduction efficiency of desulfurization degree, bioxin is calculated, the desulfurization degree of the present embodiment is the emission reduction efficiency of 87.71% , bioxin
For 70.23%.
Embodiment 6
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the thickness of the collaboration emission reduction bed of material 3 is 150mm, and detects SO2The generation of, bioxin
Concentration, and the emission reduction efficiency of desulfurization degree, bioxin is calculated, the desulfurization degree of the present embodiment is the emission reduction efficiency of 85.45% , bioxin
For 69.88%.
Embodiment 7
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the thickness of the collaboration emission reduction bed of material 3 is 160mm, and detects SO2The generation of, bioxin
Concentration, and the emission reduction efficiency of desulfurization degree, bioxin is calculated, the desulfurization degree of the present embodiment is the emission reduction efficiency of 84.28% , bioxin
For 69.21%.
Embodiment 8
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein except adding urea as bioxin emission reduction inhibitor in the collaboration emission reduction bed of material 3,
And applicant has been mixed into kaolin in the collaboration emission reduction bed of material 3, wherein kaolinic addition is sinter bed gross mass
0.01%, the percent of pass that the kaolin is added to 200 mesh sieves is 75%, and detects SO2The generation concentration of, bioxin, and calculate
The emission reduction efficiency of desulfurization degree, bioxin.Then, applicant has surprisingly found that, in the collaboration thickness of the emission reduction bed of material 3, urea proportioning etc.
The emission reduction efficiency of the identical Shi bioxin of condition is improved, and the present embodiment desulfurization degree is that the emission reduction efficiency of 84.98% , bioxin is
65.47%.
Embodiment 9
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the height of the distance from bottom pallet 5 of the collaboration emission reduction bed of material 3 is 80mm, wherein urinating
The addition of element is the 0.04% of sinter bed gross mass, the quality hundred of the carbon-containing fuel in described association's collaboration emission reduction bed of material 3
Point content is 3.5%, and wherein carbon-containing fuel is that the weight/mass percentage composition of the CaO in coal dust, the collaboration emission reduction bed of material 3 is 4.5%；
In addition, the boost pressure of described booster pump is 0.8KPa, it is 0.75m/mim to control the wind speed in sack cleaner 9.And detect
SO2The generation concentration of, bioxin, and the emission reduction efficiency of desulfurization degree, bioxin is calculated, the desulfurization degree of the present embodiment is 76.77%,
The emission reduction efficiency of bioxin is 62.23%.
Embodiment 10
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process be the same as Example 1 of discharge-reducing method, difference
Be in：The mixing of the shop fixtures bed of material 1, first bed of material 2 of the present embodiment, the bed of material of the mixing bed of material 4 of the collaboration emission reduction bed of material 3 and second are total
Highly (bed of material gross thickness) is 800mm, wherein the height with the distance from bottom pallet 5 of the emission reduction bed of material 3 is 100mm, wherein urinating
The addition of element is the 0.011% of sinter bed gross mass, the quality percentage of the carbon-containing fuel in the described collaboration emission reduction bed of material 3
Content is 5.0%, and wherein carbon-containing fuel presses 1 by coke powder and coal dust：CaO in 1 mass ratio composition, the collaboration emission reduction bed of material 3
Weight/mass percentage composition be 6.0%；In addition, the boost pressure of described booster pump is 1.0KPa, in control sack cleaner 9
Wind speed is 0.85m/mim.And detect SO2The generation concentration of, bioxin, and calculate the emission reduction efficiency of desulfurization degree, bioxin, this reality
The desulfurization degree for applying example is that the emission reduction efficiency of 86.87% , bioxin is 65.43%.
Claims (4)
1. a kind of sintering process SO based on addition solid inhibitor2, bioxin cooperates with discharge-reducing method, it is characterised in that：Specifically
Step is as follows：
Step one：Sintering feed
(A) mat formation on the top of pallet (5) the shop fixtures bed of material (1)；
(B) sinter mixture is mated formation in the top of the shop fixtures bed of material (1), forms first and mix the bed of material (2)；
(C) the Ammonia inhibitor particle of solid is mixed with sinter mixture, the addition of the Ammonia inhibitor particle of solid
Measure as the 0.04%-0.11% of sinter bed gross mass, then the sinter mixture for being mixed with solid Ammonia inhibitor is mated formation
The collaboration emission reduction bed of material (3) is formed above the first mixing bed of material (2)；The described collaboration emission reduction bed of material (3) distance from bottom pallet
(5) distance is the 1/10-1/8 of sinter bed total height, and the thickness of the collaboration emission reduction bed of material (3) is the 1/ of sinter bed total height
8-1/5；
(D) sinter mixture is mated formation above the collaboration emission reduction bed of material (3) again, forms second and mix the bed of material (4)；
Step 2：Fume centralized collection is handled
Down draft sintering is carried out after igniting, during sintering machine down draft sintering, by the bellows of pallet (5) postmedian
Flue gas import sack cleaner (9) through booster pump, the boost pressure of described booster pump is 0.8-1.0KPa, and control cloth bag is removed
Wind speed in dirt device (9) is 0.75-0.85m/mim, and the sintering flue gas after sack cleaner (9) dedusting is introduced by pipeline to be sintered
Owner's flue (8).
2. a kind of sintering process SO based on addition solid inhibitor according to claim 12, bioxin cooperates with emission reduction side
Method, it is characterised in that：Solid Ammonia inhibitor in the described collaboration emission reduction bed of material (3) is urea granules；Described collaboration subtracts
The weight/mass percentage composition of carbon-containing fuel in discharge layer (3) is the CaO in 3.5%-5.0%, the described collaboration emission reduction bed of material (3)
Weight/mass percentage composition be 4.5%-6.0%.
3. a kind of sintering process SO based on addition solid inhibitor according to claim 22, bioxin cooperates with emission reduction side
Method, it is characterised in that：The average grain diameter of described urea granules is 0.30-0.50mm.
4. a kind of sintering process SO based on addition solid inhibitor according to claim 32, bioxin cooperates with emission reduction side
Method, it is characterised in that：The bellows of described postmedian are that lower section is corresponding at pallet (5) length direction 1/2-3/4 positions
Bellows.
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| CN112410549B (en) * | 2020-11-30 | 2023-10-27 | 安徽工业大学 | Multilayer pellet for reducing emission of sintering flue gas pollutants |
| CN112430730B (en) * | 2020-11-30 | 2023-10-24 | 安徽工业大学 | Suppression of SO in sintering process 2 、NO x Multilayer composite pellets of (2) |
| CN112725616B (en) * | 2020-12-29 | 2023-06-16 | 安徽工业大学 | Method for reducing emission of sintering flue gas pollutants by utilizing SCR (selective catalytic reduction) containing waste catalyst pellets |
| CN113174482B (en) * | 2021-03-22 | 2022-10-04 | 中冶长天国际工程有限责任公司 | Process and device for cooperatively treating municipal sludge in iron ore sintering process |
| CN113430366A (en) * | 2021-06-03 | 2021-09-24 | 北京首钢股份有限公司 | Sintering material using urea as desulfurizer and sintering method |
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Application publication date: 20160817 Assignee: Zhejiang Majia Environmental Technology Co.,Ltd. Assignor: ANHUI University OF TECHNOLOGY Contract record no.: X2021980001677 Denomination of invention: A collaborative emission reduction method of SO2, dioxin in sintering process based on adding solid inhibitor Granted publication date: 20170825 License type: Common License Record date: 20210315 |