CN104962732B - A kind of sintering process SO2, bioxin cooperates with discharge-reducing method and system - Google Patents
A kind of sintering process SO2, bioxin cooperates with discharge-reducing method and system Download PDFInfo
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Abstract
The invention discloses a kind of sintering process SO2, bioxin cooperates with discharge-reducing method and system, belongs to pollution reduction technical field in sintering process.Collaboration emission-reducing system of the invention includes grate-layer material distribution device, the first mixture distributor device, emission reduction mixture distributor device, the second mixture distributor device, and the bellows of pallet postmedian are connected through sack cleaner with flue collector；The step of collaboration discharge-reducing method is：Step one：Sintering feed：(A) mat formation the shop fixtures bed of material；(B) mat formation the first mixing bed of material；(C) mat formation and cooperate with the emission reduction bed of material；(D) mat formation the second mixing bed of material；Step 2：Fume centralized collection is processed：The flue gas in pallet postmedian bellows is introduced into Main Gas Flue of Sintering Machine after sack cleaner dedusting by pipeline in sintering process.The present invention realizes sintering process SO by setting the collaboration emission reduction bed of material2The collaboration emission reduction of, bioxin, significantly reduces the emission reduction burden of iron and steel enterprise.
Description
Technical field
The present invention relates to pollution reduction technical field in sintering process, more specifically to a kind of sintering process
SO2, bioxin cooperates with discharge-reducing method and system.
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 feweri, it is necessary to a large amount of to exploit and provided using lean ore
Source.Lean ore directly enters stove to be smelted can deteriorate blast fumance index.Therefore, lean ore is processed by ore dressing and obtains fine ore.Concentrate
The fine ore produced in exploitation and process with rich ore, blast furnace ironmaking could be used for after needing 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.
And, sintering process is very strong to the adaptability of raw material, not only can produce sintering deposit with the thicker rich ore powder of granularity and fine ore, together
When can also process industrial ferrous contained discarded object.
However, while sintering process well enters stove ore deposit for blast furnace is provided, also bringing huge environmental pollution.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 of sintering flue gas, is broadly divided into dry method, semidry method
And wet method, although major part can effectively remove SO2But, 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
Dye thing discharge-reducing method is imperative.
In addition, removing SO2Outside , bioxin be another most important pollutant；Compared to SO2, bioxin to human health and
Natural environment harm is bigger, and degraded is difficult in natural environment, being capable of long-distance migration in the world.Bioxin is once arranged
Put in atmosphere, it is difficult to 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, and 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 the production unit for producing dioxin pollutant more, and sintering produces bioxin to account 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 heat energy for producing that burns is by the compound sintering in burning zone or melts.It is anti-that sintering possesses de novo formation de novo
The most of condition answered：(1) chlorine comes from the organic chlorine component in reclaimed dust, slag and iron ore；(2) carbon source is in carbon
Fiber, lignin, coke, vinyl etc.；(3) with deformation and vacant graphite-structure, butter, copper and ferrous metal from
Son, as catalyst；(4) oxidizing atmosphere, temperature is 250-450 DEG C.
Additionally, 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.And, to reduce the low temperature reduction degradation of 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 for the generation of sintering process Zhong bioxin provides " chlorine source ", 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.And, China's 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, sintering flue gas desulfurization dust removal integrated equipment of 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 the absorption emission reduction of big exhaust gas volumn, 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.
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 is realized in sintering process by the addition Ammonia material in sinter bed
In bioxin emission reductions.Above-mentioned published technical scheme, proposes three kinds of addition schemes of Ammonia inhibitor, and (1) presses down Ammonia
All mixing is added in sinter bed preparation, and be added in Ammonia inhibitor at a certain height of sinter bed by (2), and (3) are by ammonia
Class inhibitor is sprayed on the sintered compound bed of material.
But, there is following technology drawback in three kinds of 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
Entering amount can have a strong impact on the quality of sintering deposit；
(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 that urea granules are added to 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 that emission reduction effect produces fluctuation；Further, since flue gas is in cooling
During, constantly there is bioxin to generate, if inhibitor is simply added into a certain height in the sintered compound bed of material so that flue gas
By sintering during 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, sintering deposit all technical can be caused to become if urea is dissolved in into the water full compound of addition
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 all it is 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, in sintering process sinter 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 process2, bioxin collaboration emission reduction, be not discharge-reducing method simple superposition i.e. be capable of achieving sintering
During SO2The collaboration emission reduction of, bioxin, just because of the difficulty of collaboration emission reduction so that prior art is difficult to overcome in sintering
During online SO2, bioxin cooperates with the technical bottleneck of emission reduction, and the present invention overcomes this by creative technical scheme
One technical bottleneck.
In addition, existing online emission reduction schedule, only proposes a discharge-reducing method for sintering flue gas pollutant, but
It is that, because emission reduction product is extremely tiny, if carrying out dedusting using deduster, will certainly cause to produce pressure during sintering exhausting
Damage, air quantity is uneven in causing 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, and causes the product after emission reduction to obtain not
To collection, it is impossible to which the sintered product to online emission reduction is processed 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 to realize SO in sintering process2, bioxin cooperates with the deficiency of emission reduction, there is provided a kind of sintering process SO2, bioxin is cooperateed with
Discharge-reducing method and system, realize in the online SO of sintering 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 of the invention2, bioxin collaboration discharge-reducing method, specific step is as follows：
Step one：Sintering feed
(A) mat formation the shop fixtures bed of material on the top of pallet；
(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) Ammonia inhibitor is dissolved in after water and is mixed with sinter mixture, will then be mixed with Ammonia inhibitor
Sinter mixture to be mated formation and form the collaboration emission reduction bed of material 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 processed
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/min, and sintering machine main cigarette is introduced by pipeline through the sintering flue gas after sack cleaner dedusting
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, cooperates with the thickness of the emission reduction bed of material for the 1/8-1/5 of sinter bed total height.
Further, the Ammonia inhibitor solution in the described collaboration emission reduction bed of material is urea liquid, wherein urea
Addition is the 0.03%-0.12% of sinter bed gross mass；The quality hundred of the carbon-containing fuel in the described collaboration emission reduction bed of material
Content is divided to be 3.5%-5.0%, the weight/mass percentage composition of the CaO in the described collaboration emission reduction bed of material is 4.5%-6.0%.
Further, the bellows of described postmedian are lower section correspondence at pallet length direction 1/2-3/4 positions
Bellows.
A kind of sintering process SO of the invention2, bioxin cooperates with emission-reducing system, and described pallet top sets gradually
There are grate-layer material distribution device, the first mixture distributor device, emission reduction mixture distributor device, the second mixture distributor device；Its
In：Described grate-layer material distribution device is used to mat formation the shop fixtures bed of material on pallet top, described the first mixture distributor dress
Put for sinter mixture of mating formation above the shop fixtures bed of material, and form first and mix the bed of material, described emission reduction mixture distributor dress
Put and be mixed with the sinter mixture of Ammonia inhibitor for mating formation above the first mixing bed of material, and form the collaboration emission reduction bed of material；Institute
The the second mixture distributor device stated is used for sinter mixture of mating formation above the collaboration emission reduction bed of material, and forms the second compound
Layer；The bottom of described pallet is provided with bellows, and the wherein bellows of pallet postmedian are connected with flue is focused on,
It is described to focus on flue and be connected with the entrance point of sack cleaner through increasing pump, the port of export of the sack cleaner and main cigarette
Road is connected, and described remaining bellows of pallet are directly connected with flue collector.
Further, the filter bag specification of described sack cleaner is 160 × 6000mm of Φ, and described filter bag material is
The laminating filtrates of PTFE.
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 of the invention2, bioxin cooperates with discharge-reducing method and system, and creative proposition will be mixed with ammonia
The sinter mixture of class inhibitor to be mated formation and form the collaboration emission reduction bed of material above the first mixing bed of material, and creativeness have adjusted
The content of carbon-containing fuel and CaO in the collaboration emission reduction bed of material, forms a collaboration emission reduction band wider so that burn in sinter bed
Knot flue gas suppresses the generation of bioxin during cooling, until sinter flue-gas temperature be reduced to bioxin synthesis temperature with
Under, and while bioxin generation is suppressed, it is gathered in the SO of excessive moistening layer2Reacted with urea so that collaboration emission reduction band
Cover the active position for producing layer and desulfurization of bioxin；So as to breakthrough realizes online SO in sintering process2、
The collaboration emission reduction of bioxin, and the normal production of sintering work is ensure that, overcome Single Pollution thing end of the prior art
The technology drawback for the treatment of is held, the cost of sintering process pollution reduction is greatly reduced, the emission reduction for alleviating iron and steel enterprise is born
Load；
Additionally, 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 collaboration emission-reducing system of the invention；
Fig. 2 is the cloth schematic diagram of collaboration 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
Material device；7th, flue is focused on；8th, flue collector；9th, sack cleaner.
Specific 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 of the present embodiment2, bioxin cooperates with emission-reducing system, described
The top of pallet 5 is disposed with grate-layer material distribution device 61, the first mixture distributor device 62, emission reduction mixture distributor dress
The 63, second mixture distributor device 64 (as shown in Figure 1) is put, wherein：Described grate-layer material distribution device 61 is used in sintering platform
The top of car 5 is mated formation the shop fixtures bed of material 1, and the first described mixture distributor device 62 is used for mixed in the top of the shop fixtures bed of material 1 sintering of mating formation
Material is closed, and forms 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 to mat formation in the top of the first mixing bed of material 2 and is mixed with the sinter mixture of Ammonia inhibitor, and
The collaboration emission reduction bed of material 3 is formed, the height of the distance from bottom pallet 5 of the collaboration emission reduction bed of material 3 is 90mm, the collaboration emission reduction bed of material 3
Thickness be 100mm；The second described mixture distributor device 64 is used for sintered compound of mating formation above the collaboration emission reduction bed of material 3
Material, and the second mixing bed of material 4 is formed, the described mixing of the shop fixtures bed of material 1, first bed of material 2, the mixing of the collaboration emission reduction bed of material 3 and second
The bed of material total height (bed of material gross thickness) of the bed of material 4 is 800mm.The area of the pallet 5 of the present embodiment is 180m2, sinter platform
There are 14 bellows, and the open numbering from sintering device handpiece in the lower section of car 5, and 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
Reason flue 7 is connected, and the bellows of the postmedian are the corresponding bellows in lower section at the length direction 1/2-3/4 positions of pallet 5, as
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 resource application, meets the theory for turning 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 process2Production mechanism, formation zone, emission reduction condition with bioxin 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
Limitation 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 generate bioxin and 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 targetedly added urea to be capable of achieving emission reduction to this narrow and small one layer；However, suppressing
, it is necessary in flue-gas temperature by the lasting generation for suppressing bioxin of 200-800 DEG C of temperature range when bioxin is generated.
Seriously to be hindered just because of factors above and limit SO in sintering process2He bioxin cooperates with emission reduction, burns in addition
The complexity of knot process, fluctuation, each layer sintered in sintering process all constantly change 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 to be mated formation and form the collaboration emission reduction bed of material 3 in the first mixing bed of material 2 top, so as to formed in sinter bed one compared with
Collaboration emission reduction band wide so that sintering flue gas suppresses the generation of bioxin during cooling, until sintering flue-gas temperature drop
Below low Dao bis- Evil English synthesis temperatures, and while bioxin generation is suppressed, it is gathered in the SO of excessive moistening layer2Sent out with urea
Raw reaction so that collaboration emission reduction band covers the active position for producing layer and desulfurization of bioxin；And, the present invention improves association
With the content of CaO in the emission reduction bed of material 3, for urea realizes that bioxin emission reduction provides a weakly alkaline environment, applicant is surprised
It was found that emission reduction effect is greatly improved；Additionally, 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, and 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 realize online SO in sintering process2The collaboration emission reduction of, bioxin, overcomes this important technical
Bottleneck.
A kind of sintering process SO of the invention2, bioxin cooperates with discharge-reducing method, and its specific implementation step is：
Step one：Sintering feed
(A) mated formation grate-layer material on the top of pallet 5 using grate-layer material distribution device 61, form the shop fixtures bed of material 1；
(B) form first and mix in the top dress paving sinter mixture of the shop fixtures bed of material 1 using the first mixture distributor device 62
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) Ammonia inhibitor is dissolved in after water and is mixed with sinter mixture, using emission reduction mixture distributor device
63 sinter mixtures that will be mixed with Ammonia inhibitor to be mated formation and form the collaboration emission reduction bed of material 3, the collaboration in the top of the first mixing bed of material 2
The height of the distance from bottom pallet 5 of the emission reduction bed of material 3 is 90mm, and the thickness of the collaboration emission reduction bed of material 3 is 100mm；
(D) sinter mixture is mated formation in the top of the collaboration emission reduction bed of material 3 using the second mixture distributor device 64, forms the
The two mixing bed of materials 4；
Step 2：Fume centralized collection is processed
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 is imported 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, the wind speed in sack cleaner 9 is controlled for 0.80m/min, 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 urea liquid, the wherein addition of urea
It is the 0.09% of sinter bed gross mass.In the sinter mixture of the first mixing mixing bed of material 4 of the bed of material 2 and second of the present embodiment
Carbon-containing fuel weight/mass percentage composition be 3.2%, the carbon-containing fuel be coke powder, and first mixing the compound of the bed of material 2 and second
The weight/mass percentage composition of the CaO in the sinter mixture of layer 4 is 4.2%；The described carbon-containing fuel cooperateed with the emission reduction bed of material 3
Weight/mass percentage composition is 4.0%, and the carbon-containing fuel is coke powder, and the weight/mass percentage composition of the CaO in the collaboration emission reduction bed of material 3 is
5.0%.
During sintering, the SO of flue gas in the measurement sintering process of flue collector 82Concentration is counted He the concentration of bioxin
Desulfurization degree is calculated He the emission reduction efficiency of bioxin.
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, used as benchmarks, with embodiment 1, difference is the sintering process of this comparative example：Collaboration
The thickness of the emission reduction bed of material 3 is zero, that is, be 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 starts, the SO of flue gas in sintering process is measured2The concentration of, bioxin, and such as table 1 is recorded, as later stage reality
The benchmark tested.
SO in the flue gas of the sintering experiment of table 12, bioxin concentration and emission reduction efficiency
By the experiment of comparative example 1 and embodiment 1 it can be found that between the first mixing bed of material 2 and second mixes the bed of material 4
After being provided with the collaboration emission reduction bed of material 3, compared to the benchmarks in comparative example 1, SO in flue gas in embodiment 12Concentration (mg/Nm3) by
694.2mg/Nm3It is reduced to 108.0mg/Nm3, emission reduction efficiency reaches 84.44%, bioxin concentration (pg-TEQ/ in flue gas
Nm3) by 763pg-TEQ/Nm3It is reduced to 287pg-TEQ/Nm3, emission reduction efficiency reaches 62.39%, reached National Pollutant
The standard of emission reduction, so that breakthrough realizes online SO in sintering process2The collaboration emission reduction of, bioxin, overcomes this
One important technical bottleneck.Desulfurization degree in embodiment 1-7 is He bioxin emission reduction efficiency is as shown in Figure 3.
The present invention sets a collaboration emission reduction bed of material 3 wider by creative proposition in the sintered compound bed of material, assists
Urea is added with as bioxin formation inhibitor with the emission reduction bed of material 3, and have adjusted the composition proportion in the collaboration emission reduction bed of material 3,
So that sintering flue gas suppresses the generation of bioxin during cooling, until sintering flue-gas temperature is reduced to bioxin synthesis temperature
Below degree, and while bioxin generation is suppressed, it is gathered in the SO of excessive moistening layer2Reacted with urea so that collaboration subtracts
Row's band covers the active position for producing layer and desulfurization of bioxin；And, improve for the invention cooperates with emission reduction material
The content of CaO, for urea realizes that bioxin emission reduction provides a weakly alkaline environment, substantially increases emission reduction effect in layer 3, this
Outward, it is appropriate to improve the content of carbon-containing fuel in the collaboration emission reduction bed of material 3, it is to burn so as to ensure all technical of sintering
Knot production is normally carried out providing safeguard, so as on the premise of sintering quality is ensured, it is suppressed that the generation of sintering process bioxin；
And while sintering process bioxin emission reduction is realized, it is gathered in the SO of excessive moistening layer2Reacted with urea so that sintering
SO in flue gas2Emission reduction is obtained, it is achieved thereby that sintering process SO2The collaboration emission reduction of, bioxin, the cleaning life to steel and iron industry
Produce and sustainable development is significant.
Embodiment 2
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 85.14% , bioxin
It is 63.83%.
Embodiment 3
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 85.78% , bioxin
It is 65.95%.
Embodiment 4
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 86.13% , bioxin
It is 67.21%.
Embodiment 5
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 86.56% , bioxin
It is 68.13%.
Embodiment 6
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 85.29% , bioxin
It is 69.08%.
Embodiment 7
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 83.86% , bioxin
It is 69.34%.
Embodiment 8
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 thickness of the collaboration 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 84.86% , bioxin is
65.57%.
Embodiment 9
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 0.03% of sinter bed gross mass, and described association cooperates with the quality hundred of the carbon-containing fuel in the emission reduction bed of material 3
Content is divided to be 3.5%, wherein carbon-containing fuel is coal dust, and the weight/mass percentage composition of the CaO in the collaboration emission reduction bed of material 3 is 4.5%；
Additionally, the boost pressure of described booster pump is 0.8KPa, it is 0.75m/min 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 75.19%,
The emission reduction efficiency of bioxin is 55.08%.
Embodiment 10
SO in the sintering process of the present embodiment2, bioxin cooperates with the basic process of discharge-reducing method with embodiment 1, difference
Place is：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 be 100mm with the height of the distance from bottom pallet 5 of the emission reduction bed of material 3, wherein urinating
The addition of element is the 0.12% 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：1 mass ratio composition, the CaO in the collaboration emission reduction bed of material 3
Weight/mass percentage composition be 6.0%；Additionally, the boost pressure of described booster pump is 1.0KPa, in control sack cleaner 9
Wind speed is 0.85m/min.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 85.38% , bioxin is 66.58%.
Schematical above that the present invention and embodiments thereof are described, the description does not have restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel enlightened by it, in the case where the invention objective is not departed from, is designed and the technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (4)
1. a kind of sintering process SO2, bioxin cooperates with discharge-reducing method, it is characterised in that：Specific step is as follows：
Step one：Sintering feed
(A) mat formation the shop fixtures bed of material (1) on the top of pallet (5)；
(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) Ammonia inhibitor is dissolved in after water and is mixed with sinter mixture, will then be mixed with the sintering of Ammonia inhibitor
Compound to be mated formation and form the collaboration emission reduction bed of material (3) in the first mixing bed of material (2) top；Described collaboration emission reduction the bed of material (3) bottom
It is the 1/10-1/8 of sinter bed total height apart from the distance of pallet (5), the thickness of the collaboration emission reduction bed of material (3) is sintering feed
The 1/8-1/5 of layer total height；
(D) sinter mixture is mated formation in the collaboration emission reduction bed of material (3) top again, forms second and mix the bed of material (4)；
Step 2：Fume centralized collection is processed
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/min, is introduced by pipeline through the sintering flue gas after sack cleaner (9) dedusting and sintered
Owner's flue (8).
2. a kind of sintering process SO according to claim 12, bioxin cooperates with discharge-reducing method, it is characterised in that：Described
Ammonia inhibitor solution in the collaboration emission reduction bed of material (3) is urea liquid, and wherein the addition of urea is sinter bed gross mass
0.03%-0.12%；The weight/mass percentage composition of the carbon-containing fuel in the described collaboration emission reduction bed of material (3) is 3.5%-5.0%,
The weight/mass percentage composition of the CaO in the described collaboration emission reduction bed of material (3) is 4.5%-6.0%.
3. a kind of sintering process SO according to claim 22, bioxin cooperates with discharge-reducing method, it is characterised in that：Described
The bellows of postmedian are the corresponding bellows in lower section at pallet (5) length direction 1/2-3/4 positions.
4. a kind of sintering process SO2, bioxin cooperates with emission-reducing system, it is characterised in that：Described pallet (5) top is successively
Be provided with grate-layer material distribution device (61), the first mixture distributor device (62), emission reduction mixture distributor device (63), second mix
Close material distribution device (64)；
Wherein：Described grate-layer material distribution device (61) is described for mating formation the shop fixtures bed of material (1) on pallet (5) top
First mixture distributor device (62) forms the first mixing bed of material for sinter mixture of mating formation above the shop fixtures bed of material (1)
(2), described emission reduction mixture distributor device (63) is mixed with Ammonia inhibitor for mating formation in the first mixing bed of material (2) top
Sinter mixture, and form the collaboration emission reduction bed of material (3)；The second described mixture distributor device (64) is in collaboration emission reduction material
Layer (3) top is mated formation sinter mixture, and is formed second and mixed the bed of material (4)；
The bottom of described pallet (5) is provided with bellows, wherein the bellows of pallet (5) postmedian with focus on cigarette
Road (7) is connected, and the described flue (7) that focuses on is connected through increasing pump with the entrance point of sack cleaner (9), the bag-type dust
The port of export of device (9) is connected with flue collector (8), and described pallet (5) remaining bellows are directly connected with flue collector (8)；
The filter bag specification of described sack cleaner (9) is 160 × 6000mm of Φ, and described filter bag material is the laminating filtrates of PTFE；Institute
The bellows of the postmedian stated are the corresponding bellows in lower section at pallet (5) length direction 1/2-3/4 positions.
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| CN113444876A (en) * | 2021-06-29 | 2021-09-28 | 安徽工业大学 | Emission reduction SO in sintering and distributing process based on ammonia additives2Method (2) |
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| CN102847419A (en) * | 2011-06-30 | 2013-01-02 | 宝山钢铁股份有限公司 | Method for reducing emission of dioxin during iron ore sintering process |
| CN103706245A (en) * | 2013-12-23 | 2014-04-09 | 科林环保装备股份有限公司 | Integrated sintering flue gas desulfurization/dioxin removal/dust collection equipment without electrostatic dust collector |
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Application publication date: 20151007 Assignee: SHANDONG NUODE EERGY TECHNOLOGY CO., LTD. Assignor: Anhui University of Technology Contract record no.: 2017340000028 Denomination of invention: Method and system for synergistic emission reduction of SO2 and dioxin in sintering process Granted publication date: 20170616 License type: Common License Record date: 20171023 |