CN109136542A - A kind of discharge-reducing method of Ore Sintering Process flue gas pollutant - Google Patents
A kind of discharge-reducing method of Ore Sintering Process flue gas pollutant Download PDFInfo
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- CN109136542A CN109136542A CN201811162960.2A CN201811162960A CN109136542A CN 109136542 A CN109136542 A CN 109136542A CN 201811162960 A CN201811162960 A CN 201811162960A CN 109136542 A CN109136542 A CN 109136542A
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- fuel
- flue gas
- sintering
- sintering process
- discharge
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
Abstract
The invention discloses a kind of discharge-reducing methods of Ore Sintering Process flue gas pollutant, are related to sintered pollutant technical field of emission reduction.The present invention quick lime is added in fuel under conditions of water is not added first carry out it is dry-mixed, denatured fuel is made, the denatured fuel is mixed with iron-bearing material and flux again, pelletizes to obtain mixture, mixture dress is laid on trolley, is lighted a fire to mixture, down draft sintering；Then electrostatic precipitator and desulfurizing tower are provided on sintering flue gas pipeline.The discharge amount of NOx can be effectively reduced by being mixed into the denatured fuel in sinter mixture in the present invention；Effective emission reduction is carried out to sintering flue gas fine particle additionally by the mode of electric precipitation；And it is provided with desulfurizing tower, to realize sintering process SO2Effective emission reduction, and then realize sintering process in multiple pollutant joint emission reduction.
Description
Technical field
The present invention relates to sintered pollutant technical field of emission reduction, more specifically to a kind of Ore Sintering Process flue gas
The discharge-reducing method of pollutant.
Background technique
Steel is a kind of most commonly used metal material of the current mankind, and global iron and steel output is also constantly rising, but steel
Harm caused by environment also can not be ignored during iron mass production, can especially discharge a large amount of dirts during the sintering process
Contaminate object；NOx, the SO discharged such as sintering process2With the atmosphere pollutions such as fine particle.
Sintering process NOx emission situation is especially severe at present, and the discharge of a large amount of NOx forms photochemical fog and acid rain
One major reason all causes extremely serious harm to the health of ecological environment and its people.And sintering process SO2's
Form of export is also very severe, SO2It is to jeopardize the side of ecological environment and human society one of the main reason for forming acid rain
Aspect face.In addition, the fine particle in sintering flue gas is easy alkali metal, heavy metal and organic contamination in enrichment sintering process
The poisonous and harmful substances such as object, being discharged into atmosphere can cause to seriously endanger to environment, therefore, realize a variety of pollutions in sintering process
The joint emission reduction of object is extremely urgent.
Through retrieving, invention and created name are as follows: a kind of comprehensive emission reduction of sintering flue gas pollutant system and technique (application number:
201710742927.6, the applying date: 2017.08.25), this application includes sintering machine, A flue, denitrification apparatus, boiler, B cigarette
Road, B flue desulfurization device；A flue one end connects the first half bellows of sintering machine, and B flue one end connects the later half of sintering machine
Part bellows；The A flue other end is connected with boiler, and boiler connects denitrification apparatus；The B flue other end and B flue desulfurization device phase
Even；Multi-pollutant emission reduction may be implemented in this application to a certain extent, but its removal effect is extremely limited.Invention and created name
Are as follows: additive modified coke reduce sintering process NOx emission method (application number: 200710177237.7, the applying date:
2007.11.13), it is 0.5 mass %~10.0 that additive is added to the water and is configured to additive component total concentration by this application
The coke granule of 0.5mm~10mm is added in the lotion of quality %, stirring lotion in the process, is MgO, Mg (OH) by additive2、
MgCO3、Ca(OH)2、CaCO3、La2O3、CeO2、Ce2(C2O4)3、NiO、Ni2O3、Co2O3、Fe3O4、Fe2O3One of or 2~4
Kind mixture, this application inhibit nitrogen oxides in fuel combustion process by carrying out specific aim processing to sintering fuel
Discharge；But these substances are added in sintering feed will lead to and be mixed into a large amount of impurity element in mixture, to influence to burn
Tie mineral amount.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to provide for the lower problem of sintering process nitrogen oxides emission reduction efficiency in the prior art
A kind of discharge-reducing method of Ore Sintering Process flue gas pollutant；The present invention is by by the fuel particle of small particle and a small amount of life
Lime particle progress is dry-mixed, denatured fuel is prepared, the denatured fuel is mixed into sinter mixture can be effectively reduced nitrogen oxygen
Compound discharge amount；Effective emission reduction is carried out to sintering flue gas fine particle additionally by the mode of electric precipitation；And it is provided with desulfurization
Tower realizes the joint emission reduction of multiple pollutant in sintering process.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of discharge-reducing method of Ore Sintering Process flue gas pollutant of the invention, step are as follows:
(1) fuel reforming is handled
Quick lime is added in fuel under conditions of water is not added and carries out dry-mixed, obtained denatured fuel；
(2) sintering feed is prepared
Iron-bearing material, flux are mixed with denatured fuel, pelletize to obtain mixture；
(3) down draft sintering
Mixture dress is laid on pallet, is lighted a fire to mixture, down draft sintering；
(4) fume treatment
Sintering flue gas during down draft sintering enters flue collector by the bellows of pallet bottom, and pacifies on flue collector
Dress electrostatic precipitator is dusted, and flue gas is pumped into desulfurizing tower through exhaust fan after electrostatic precipitation and carries out flue gas desulfurization, after desulfurization
Flue gas be discharged through chimney.
Preferably, quick lime additional amount is the 0.25%~5% of fuel gross mass in step (1).
Preferably, the flue gas in the bellows of pallet middle and back is introduced into reunion room by air-introduced machine, and to reunion room
Middle penetrating agglomerator, sintering flue gas are introduced into electrostatic precipitator after reunion is handled and are dusted.
Preferably, the ratio between the quality of fuel of fuel of the granularity less than 1.0mm and granularity greater than 1.0mm in step (1) are as follows:
1~1.86.
Preferably, quick lime additional amount is the 0.5%~3% of fuel gross mass in step (1).
Preferably, the bellows of pallet middle and back are that lower section is corresponding at pallet length direction 2/3 to tail position
Bellows.
Preferably, the reunion room be Venturi, the agglomerator be polyacrylamide, sodium carboxymethylcellulose or
Polymer alumina any one or any two or more mixture.
Preferably, it is 25%~30% that fuel of the granularity less than 0.5mm, which accounts for the percentage of fuel gross mass,.
Preferably, the percentage that fuel of the granularity greater than 3mm accounts for fuel gross mass is less than or equal to 20%.
Preferably, in quick lime partial size less than 200 mesh accounting be not less than 80%.
3. beneficial effect
Using technical solution provided by the invention, compared with existing well-known technique, there is following remarkable result:
(1) discharge-reducing method of a kind of Ore Sintering Process flue gas pollutant of the invention, first under conditions of water is not added
Quick lime is added in fuel and carries out dry-mixed, obtained denatured fuel, then the denatured fuel and iron-bearing material and flux are carried out
Mixing, granulation obtain mixture, and mixture dress is laid on trolley, is lighted a fire to mixture, down draft sintering, to realize iron
The efficient emission-reducing of mine sintering process nitrogen oxides；Sintering flue gas is subjected to electrostatic precipitation again, to realize fine in sintering flue gas
Effective emission reduction of particulate matter；In conjunction with desulfurizing tower to the SO in sintering flue gas2Emission reduction is carried out, realizes sintering process multiple pollutant
Joint emission reduction.
(2) a kind of discharge-reducing method of Ore Sintering Process flue gas pollutant of the invention, the quick lime of addition account for fuel matter
The 0.5%~3% of percentage is measured, and quick lime and fuel are sufficiently dry-mixed, loosely distribution is around fuel, avoids to combustion
The combustion process of material causes to hinder, thus the effective reduction for the nitrogen oxides for promoting burning to generate, while quick lime can be to combustion
Expect that the reduction process of the nitrogen oxides generated carries out efficient catalytic, and then realizes the efficient emission-reducing of sintering process NOx.
(3) discharge-reducing method of a kind of Ore Sintering Process flue gas pollutant of the invention, by will be micro- in sintering flue gas
Fine particle carries out electrostatic precipitation, in conjunction with the emission reduction of the fine particle in the intensified-sintered flue gas of mode of chemical agglomeration, from
And realize effective emission reduction of sintering flue gas fine particle, and sintering flue gas is passed through in desulfurizing tower and carries out desulfurization process, have
Effect reduces SO in sintering flue gas2Discharge, and then realize sintering flue gas multiple pollutant emission reduction.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the discharge-reducing method of Ore Sintering Process flue gas pollutant of the invention；
Fig. 2 is illustrated for a kind of institute of the discharge-reducing method of Ore Sintering Process flue gas pollutant of the invention using device structure
Figure.
Label declaration in schematic diagram:
100, flue collector；110, air-introduced machine；
211, collapsible tube；212, Cylindrical connecting tube；213, expansion pipe；
221, reunion liquid reservoir；222, air compressor machine；
300, electrostatic precipitator；400, desulfurizing tower；500, exhaust fan；600, bellows；700, pallet；800, chimney.
Specific embodiment
Hereafter detailed description of the present invention and example embodiment are more fully understood in combination with attached drawing.
Embodiment 1
As shown in Fig. 1~2, a kind of discharge-reducing method of Ore Sintering Process flue gas pollutant of the invention, step are as follows:
(1) fuel reforming is handled
Quick lime is added in fuel under conditions of water is not added and carries out dry-mixed, obtained denatured fuel；Specific steps are as follows:
Under the dry condition, it first adds fuel in batch mixer, then again by quick lime addition in fuel, by quick lime and combustion
Material progress is dry-mixed, and the addition of water is avoided during mixing, and wherein the quality of quick lime is the 0.25% of fuel gross mass,
Wherein partial size less than the accounting of 200 mesh is not less than 80% in quick lime, and the fuel of the present embodiment is coke powder；Herein, it is worth noting
Be if batch mixer humidity to need that batch mixer is dried.
(2) sintering feed is prepared
Iron-bearing material, flux are mixed with denatured fuel, pelletize to obtain mixture；Wherein iron-bearing material may include
Iron Ore Powder is returned mine, blast furnace ash, the ion dust mud contaning of OG Ni Denggang industry factory etc., and the specific raw material proportioning of the present embodiment is as shown in table 1；
Raw material in table 1 is added in batch mixer according to raw material proportioning and is mixed, water is added during mixing, so that sintering
Raw material carries out mixing granulation and obtains sinter mixture.
1 proportions of sintering raw materials of table
(3) down draft sintering
Mixture dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and examined in sintering flue gas main pipeline
Survey the NO of sintering flue gasXContent, and record as shown in table 5.Sintering sintering index is detected and is recorded as shown in table 6.
(4) fume treatment
Sintering flue gas during down draft sintering enters flue collector 100 by the bellows 600 of 700 bottom of pallet, and
Electrostatic precipitator 300 is installed to be dusted on flue collector 100, flue gas is pumped into desulfurizing tower through exhaust fan 500 after electrostatic precipitation
400 carry out flue gas desulfurization, and the flue gas after desulfurization is discharged through chimney 800, detect and burn in the flue collector 100 at 400 rear of desulfurizing tower
Tie the NO of flue gasX、SO2And PM10Average emission concentration, and record as shown in table 8.
Embodiment 2
The basic content of the present embodiment with embodiment 1, the difference is that, in step (1) granularity be less than 1.0mm fuel
It is greater than the ratio between the quality of fuel of 1.0mm with granularity are as follows: 1~1.86, the granularmetric composition of the present embodiment fuel is as shown in table 2,
The ratio between the quality of fuel of fuel of the granularity less than 1.0mm and granularity greater than 1.0mm is 1 in middle the present embodiment.
Mixture dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and examined in sintering flue gas main pipeline
Survey the NO of sintering flue gasXContent, and record as shown in table 5.
The granularmetric composition of the fuel of 2 embodiment 2 of table
Embodiment 3
The basic content of the present embodiment with embodiment 1, the difference is that, in step (1) granularity be less than 1.0mm fuel
It is greater than the ratio between the quality of fuel of 1.0mm with granularity are as follows: 1~1.86, the granularmetric composition of the present embodiment fuel is as shown in table 3,
The ratio between the quality of fuel of fuel of the granularity less than 1.0mm and granularity greater than 1.0mm is 1.5 in middle the present embodiment.
Mixture dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and examined in sintering flue gas main pipeline
Survey the NO of sintering flue gasXContent, and record as shown in table 5.
The granularmetric composition of the fuel of 3 embodiment 3 of table
Embodiment 4
The basic content of the present embodiment with embodiment 1, the difference is that, in step (1) granularity be less than 1.0mm fuel
It is greater than the ratio between the quality of fuel of 1.0mm with granularity are as follows: 1~1.86, the granularmetric composition of the present embodiment fuel is as shown in table 3,
The ratio between the quality of fuel of fuel of the granularity less than 1.0mm and granularity greater than 1.0mm is 1.86 in middle the present embodiment.
Mixture dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and examined in sintering flue gas main pipeline
Survey the NO of sintering flue gasXContent, and record as shown in table 5.
The granularmetric composition of the fuel of 4 embodiment 4 of table
Embodiment 5
The basic content of the present embodiment with embodiment 1, the difference is that, place is dried in quick lime before dry-mixed
Reason, first adds fuel in batch mixer, then again adds quick lime on the surface of fuel, obtains denatured fuel after dry-mixed；
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, down draft sintering, and
The NO of sintering flue gas is detected in sintering flue gas main pipelineXContent, and record as shown in table 5.Sintering sintering index is detected
And it records as shown in table 6.
Embodiment 6
The basic content of the present embodiment with embodiment 1, the difference is that, add fuel to crusher and carry out broken place
Reason, the quick lime after drying process is added in fuel during fuel crushing, fuel during broken with life
Lime carries out dry-mixed, obtained denatured fuel；The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, to mixed
Close material lighted a fire, down draft sintering, and in sintering flue gas main pipeline detect sintering flue gas NOXContent, and record such as 5 institute of table
Show.
Embodiment 7
The basic content of the present embodiment with embodiment 1, the difference is that, the quality of quick lime is fuel gross mass
0.5%.
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, exhausting is burnt
It ties, and detects the NO of sintering flue gas in sintering flue gas main pipelineXContent, and record as shown in table 5.
Embodiment 8
The basic content of the present embodiment with embodiment 1, the difference is that, the quality of quick lime is fuel gross mass
1%.
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, exhausting is burnt
It ties, and detects the NO of sintering flue gas in sintering flue gas main pipelineXContent, and record as shown in table 5.
Embodiment 9
The basic content of the present embodiment with embodiment 1, the difference is that, the quality of quick lime is fuel gross mass
3%.
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, exhausting is burnt
It ties, and detects the NO of sintering flue gas in sintering flue gas main pipelineXContent, and record as shown in table 5.
Embodiment 10
The basic content of the present embodiment with embodiment 1, the difference is that, the quality of quick lime is fuel gross mass
5%.
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, exhausting is burnt
It ties, and detects the NO of sintering flue gas in sintering flue gas main pipelineXContent, and record as shown in table 5.
Embodiment 11
The basic content of the present embodiment with embodiment 1, the difference is that, wherein in quick lime partial size less than 200 purposes
Accounting is not less than 85%.The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, mixture is carried out a little
Fire, down draft sintering, and in sintering flue gas main pipeline detect sintering flue gas NOXContent, and record as shown in table 5.
Comparative example 1
The basic content of this comparative example with embodiment 1, the difference is that, processing is not modified to fuel, directly will
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, down draft sintering, and in master
The NO of sintering flue gas is detected in flue 100XContent, and record as shown in table 5.Sintering sintering index is detected and is recorded such as
Shown in table 6；And this comparative example is not provided with electrostatic precipitator 300 and desulfurizing tower 400, and records as shown in table 8.
Comparative example 2
The basic content of this comparative example with embodiment 1, the difference is that, take the quick lime of fuel mass 5%, use
LCC technology carries out package granulation, and wherein LCC technology lives gold for nippon and develops Lime Coating Coke technology.
The specific process of LCC technology are as follows: first add water to be pre-mixed granulation a part of quick lime and coke powder, so that part quick lime wraps up
Mixing granulation is carried out in coke powder outer surface, then by the fuel of quick lime package granulation and other raw materials.
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, exhausting is burnt
It ties, and detects the NO of sintering flue gas in sintering flue gas main pipelineXContent, and record as shown in table 5.To sintering sintering index into
Row is detected and is recorded as shown in table 6.
Comparative example 3
The basic content of this comparative example with embodiment 1, the difference is that, take the quick lime of fuel mass 10%, use
LCC technology carries out package granulation, and wherein LCC technology lives gold for nippon and develops Lime Coating Coke technology.
The specific process of LCC technology are as follows: first add water to be pre-mixed granulation a part of quick lime and coke powder, so that part quick lime wraps up
Mixing granulation is carried out in coke powder outer surface, then by the fuel of quick lime package granulation and other raw materials.
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, exhausting is burnt
It ties, and detects the NO of sintering flue gas in sintering flue gas main pipelineXContent, and record as shown in table 5.To sintering sintering index into
Row is detected and is recorded as shown in table 6.
Comparative example 4
The basic content of this comparative example with embodiment 1, the difference is that, the quality of quick lime is fuel gross mass
10%.
The mixture dress of iron-bearing material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, exhausting is burnt
It ties, and detects the NO of sintering flue gas in sintering flue gas main pipelineXContent, and record as shown in table 5.
5 experimental data of table is to when emission reduction rate
Table 6 is sintered index comparison
By to above-mentioned data compare and analyze it is available following as a result,
(1) embodiment 1 is compared with comparative example 1 it can be found that can be sintered by being modified fuel
NO in flue gasXConcentration by comparative example 1 (not carrying out the experiment of fuel reforming) 260mg/m3Lower emission reduction is to 220mg/m3, thus
Significantly reduce the NO in sintering flue gasXContent, and have significant emission reduction effect；At the same time from the sintering index of table 6
Data it can be found that embodiment 1 has not only reached preferable emission reduction effect, and makes the sintering index of sintering process basic
It is constant, preferable NO can be reached under the premise of guaranteeing Sintering Operation IndexXEmission reduction effect.
(2) embodiment 1, comparative example 2 and comparative example 1 are compared it can be found that whether fuel through the invention
It is modified or by being coated (LCC technology) to fuel, is attained by emission reduction NOXEffect；But it is worth analysis,
During using fuel reforming in the present invention, it is only necessary to add 0.25% quick lime and be modified and can make NOXEmission reduction
Efficiency reaches 15.38%, and NO when the quick lime of the addition of comparative example 2 5% is coated (LCC technology) to fuelXEmission reduction effect
Rate is only 11.39%.It does not understand after repeated thinking for problem applicant, and will do it demonstration by carrying out repeatedly internal discussion,
And finally think that its reason may be:
Firstly, the distinctive points of two kinds of processing modes are:
1) addition manner of quick lime
Comparative example 2 (LCC technology) carries out cladding granulation to fuel by quick lime, so that fuel surface forms quick lime
Clad inhibits fuel to contact with the direct of oxygen, to promote so that internal fuel forms relatively closed space
NOXEmission reduction.Therefore in order to reach good covered effect in fuel surface, comparative example 2 (LCC technology) is coated in fuel surface
Lasting addition water is needed during quick lime, to promote quick lime that can adequately be coated on the surface of fuel.It compares
Under, special requirement need under the dry condition to be added to quick lime in the fuel reforming technology use process of embodiment 1
Dry-mixed modification is carried out in fuel.
2) additional amount of quick lime
At the same time, comparative example 2 (LCC technology) is in order to enable quick lime carries out preferably cladding granulation to fuel, with regard to needing
Relatively great amount of quick lime is added during cladding, otherwise allowed for quick lime and be difficult to effectively wrap fuel
It covers；Obviously, if only the fuel of addition 0.25% adds water to carry out fuel cladding, quick lime is necessarily difficult to form closed cladding
Layer, therefore when using comparative example 2 (LCC technology), the additional amount of quick lime is relatively large, therefore quick lime in comparative example 2
Additional amount is the 5% of fuel.In contrast, the fuel reforming technology of the embodiment of the present invention 1, it is therefore intended that the modification to fuel,
Rather than emission reduction is achieved the effect that by fuel surface cladding, therefore fuel reforming technology of the present invention only need to be added it is relatively fewer
Fuel, so that it may achieve the effect that emission reduction, in embodiment 1 additional amount of fuel be 0.25%.
It is so the emission reduction effect of comparative example 2 (LCC technology) is inferior to 1 reason of embodiment:
One, comparative example 2 (LCC technology) inhibit fuel reaction raw after adding water to coat fuel, at fuel combustion initial stage
At reducibility gas such as CO, so that the reduction process of NOx can only rely on solid C and be restored as reducing agent；And embodiment 1 exists
During being modified to fuel, fuel will not be made to completely cut off completely with O, and then ensure that fuel is contacted with the effective of O, made
Obtaining fuel can go on smoothly in combustion process, then fuel combustion is made to form relatively great amount of CO reducibility gas, and CO can
To restore to the NOx that fuel combustion generates, and then change the reaction interface of NOx reduction；It is anti-between NOx and CO at this time
Answering interface is gas-gas phase reaction interface, is compared to gas-solid phase reaction interface, the reaction speed reacted on gas-gas phase reaction interface
Rate faster, and is reacted more abundant.
Secondly, comparative example 2 (LCC technology) be obstructed due to fuel combustion process so that fuel is difficult to conflagration and causes to fire
Expect that ignition temperature is lower, since the temperature in fuel combustion process is lower, and since the reaction of NOx needs under the high temperature conditions
It just can be carried out, so the lower meeting of fuel surface temperature is so that NOx reduction effect is insufficient；Moreover, because temperature is lower, so that with
Fuel touches Iron Ore Powder and is difficult to quickly form calcium ferrite, so as to cause the reduction of the catalysis reduction effect of NOx.
Third, surface of the quick lime in comparative example 2 (LCC technology) due to being coated on fuel, the catalytic reduction process of NOx
In occur mainly in the outer surface of fuel, the NOx that wrapping layer inner fuel is discharged, which needs to reach wrapping layer, nearby can just obtain
Reduction catalysts, and the reduction reaction interface near wrapping layer between NOx and C reduces, so the catalysis of NOx is caused to restore
Effect it is poor.And the fuel reforming technology in embodiment 1, since mixed quicklime particles granularity is smaller, in dry-mixed mistake
A part of quick lime can be sufficient filling in the gap of fuel in journey, can be formed to a certain extent again during burning opposite
Lesser reducing atmosphere, quick lime serves as the catalyst of NOx reduction, another part quick lime in fuel gap at the same time
It can be adhered to the surface of fuel, and form calcium ferrite with Iron Ore Powder during fuel surface conflagration, be formed by iron
Sour calcium can promote the catalysis of NOx to restore, and carry out catalysis reduction simultaneously to NOx with fuel surface inside fuel to realize,
And then improve NOx abatement efficiency.
(3) comparative example 2 and comparative example 3 are compared, while embodiment 1,7,9 and 10 is compared；By will be right
Ratio 2 and comparative example 3 compare discovery, quick lime of the quick lime emission reduction effect of addition 10% than addition 5% in LCC technology
Emission reduction effect is good, and reason may make a living, and lime adding amount is more, and quick lime is better to the covered effect of fuel, and then LCC skill
Art emission reduction effect is better, and before comparing example 2 and comparative example 3, applicant has also especially tested the quick lime pair of addition 3%
Fuel is coated, but has the additive amount of quick lime very little, so that being difficult to reach covered effect substantially, is not also reached substantially
The effect of emission reduction, therefore experimental data is not recorded specially.
But for the denatured fuel technology in the present invention, embodiment 1,7,9 and 10 is compared it can be found that firing
It is not that the additional amount of quick lime is more, the effect of fuel reforming is better during material is modified.Embodiment 1,7,9 and 10,
The ratio that quick lime accounts for fuel gross mass is respectively 0.25%~5%, with the addition of the additional amount of quick lime, the emission reduction of NOx
Effect first increases and then decreases, the emission reduction effect of NOx reduces instead after the additional amount of quick lime is greater than 3%, and is directed to LCC
Technology is when the additional amount of quick lime is less than 3%, substantially without emission reduction effect.This also embodies the emission reduction mechanism of the two completely not
Together.As for quick lime additive amount of the present invention be greater than 3% when, NOx abatement effect deteriorate the reason of may are as follows: add more life stone
Ash makes the gap of fuel be filled with quick lime, and has an impact to the combustibility of fuel, so that the emission reduction effect of NOx is disliked
Change.It is compared with comparative example 4 at the same time it can be found that being equally that addition quick lime carries out fuel reforming, when quick lime
When additional amount is 10%, does not achieve the effect that emission reduction not only, increased the discharge amount of NOx, reason may
It is the combustion process that excessive quick lime has seriously affected fuel, so that the conversion ratio of the N in fuel combustion process increases, and mentions
The high discharge amount of NOx.
(4) the sintering index of comparative example 1 and comparative example 1 and comparative example 2 and embodiment 10, it can be found that comparison
(LCC technology) meeting of example 2 is so that sintering index deteriorates, to influence the yield and quality of sinter.And the embodiment of the present invention 1 and comparison
The sintering index of example 1 is substantially suitable, realizes effective emission reduction under the premise of guaranteeing Sintering Operation Index to NOx.
(5) by comparative example 2~4, the fuel accounting that discovery partial size is 0.5~3mm is more, and NOx abatement effect is got over
It is good；The sintering index of the sintering index of embodiment 4 and comparative example 1 is compared into discovery simultaneously, uses discharge-reducing method of the present invention
During, it is smaller to increase the influence that small particle fuel accounting generates sinter product quality and sintering process.And it mentions
The reason of NOx abatement effect can be improved in high small particle fuel accounting is: by the reasonable employment to small particle fuel, effectively
The specific surface area for increasing fuel increases the reaction interface area of fuel, to promote the burning of fuel, so that combustion
Material generates the CO for being largely used to reduction NOx；In addition the increase of specific surface area is conducive to quickly improve ignition temperature, to promote
The reduction process of NOx；In addition biggish specific surface area also promotes quick lime to the efficient catalytic of NOx reduction process.Before reviewing
The LCC technology that face is mentioned needs to coat fuel by quick lime in batch mixer in LCC technology, since forming core needs
So fuel partial size is generally larger in LCC technology, but its there are the drawbacks of be the combustion process for further limiting fuel, because
Lead to the reduction of its specific surface area for the increase of fuel partial size；On the one hand the reduction of fuel specific surface area causes fuel particle to burn
The reduction of reaction interface, still further aspect are also unfavorable for the reduction of the NOx of its generation and the process of reduction catalysts.
(6) embodiment 5 and embodiment 1 are compared into discovery, the NOx abatement rate of embodiment 5 is higher than NOx in embodiment 1
Emission reduction rate, reason are: since the quick lime content for being used for fuel reforming in denatured fuel of the invention is less, if dry
First quick lime is added in batch mixer during mixed or quick lime and fuel are added in batch mixer simultaneously, it is viscous due to quick lime
Attached ability is stronger, so the hybrid mode can make the quick lime being largely added be adhered to the mixing container inner wall of batch mixer
On, it cannot fully be mixed with fuel so as to cause the quick lime of addition, emission reduction effect of the obtained denatured fuel to NOx
It is extremely limited；And unnecessary loss can occur according to the hybrid mode in embodiment 5 to avoid quick lime, quick lime is added
It is added in the surface of fuel, quick lime can be promoted sufficiently to be adhered to fuel surface in subsequent mixed process and in fuel particle
Between be sufficient filling with, and then improve the emission reduction effect of NOx in its sintering process.
(7) embodiment 6 and embodiment 1 are compared into discovery, the NOx abatement rate of embodiment 6 is higher than NOx in embodiment 1
Emission reduction rate, reason are: in embodiment 6, the quick lime after drying process being added to fuel during fuel crushing
In, fuel is dry-mixed with quick lime progress during broken, denatured fuel is made, broken mode, which can be, passes through crusher
Carry out Mechanical Crushing.On the one hand since the strenuous vibration of fuel promotes quick lime that can fill with fuel in the shattering process of fuel
Divide mixing, quick lime is promoted to come into full contact in subsequent mixed process with fuel surface and sufficiently fill out between fuel particle
It fills；On the other hand, the refinement that can also further promote quick lime granularity is added in crusher in quick lime, is equally beneficial for being modified
The emission reduction of fuel NOx during the sintering process.
(8) embodiment 11 and embodiment 1 are compared into discovery, the NOx abatement rate of embodiment 11 is higher than in embodiment 1
NOx abatement rate, reason are: in the present embodiment in quick lime partial size less than 200 mesh accounting be not less than 85%, subtract as far as possible
The partial size of small quick lime can promote full and uniform distribution of the quick lime around fuel, and the NOx generated to fuel is promoted to carry out
Reduction catalysts, so there is biggish help to the emission reduction efficiency for improving NOx in sintering fuel.
Embodiment 12
The present embodiment substantially with embodiment 1, the difference is that: added in fuel reforming treatment process in the present embodiment
0.3%~3% CaCl2, joined the CaCl of fuel mass 0.5% in the present embodiment in fuel reforming treatment process2,
By its it is levigate after in fuel reforming treatment process simultaneously mix；It is compared with embodiment 1, the results showed that NOx's subtracts
It arranges efficiency and improves 7.3%.
Embodiment 13
The present embodiment substantially with embodiment 1, the difference is that: added in fuel reforming treatment process in the present embodiment
0.3%~3% potassium permanganate, the present embodiment in joined fuel mass 0.5% in fuel reforming treatment process will
It is mixed simultaneously in fuel reforming treatment process after its is levigate；It is compared with embodiment 1, the results showed that the emission reduction of NOx
Efficiency improves 6.7%.
Embodiment 14
The present embodiment substantially with embodiment 1, the difference is that: added in fuel reforming treatment process in the present embodiment
0.3%~3% steel slag joined the steel slag of fuel mass 0.5% in the present embodiment in fuel reforming treatment process, will
It is mixed simultaneously in fuel reforming treatment process after its is levigate；It is compared with embodiment 1, the results showed that the emission reduction of NOx
Efficiency improves 9.2%.Its reason is: containing CaO and ferriferous oxide in steel slag, can be additionally formed new calcium ferrite to NOx
Carry out catalysis reduction；It is porous structure additionally, due to steel slag itself, specific surface area is larger, and the catalyst contained can be to NOx
Carry out fully catalysis reduction.
Embodiment 15
The present embodiment substantially with embodiment 1, the difference is that: be added in fuel reforming treatment process in the present embodiment
The steel slag of fuel mass 0.5%, 0.5% potassium permanganate and 0.5% CaCl2, by its it is levigate after fuel reforming processing
It is mixed simultaneously in the process；It is compared with embodiment 1, the results showed that the emission reduction efficiency of NOx improves 10.3%.
Embodiment 16
The present embodiment substantially with embodiment 1, the difference is that: added in fuel reforming treatment process in the present embodiment
0.3%~3% K2CO3, 0.5% is added in the present embodiment, is compared with embodiment 1, so that the emission reduction efficiency of NOx
Improve 4.7%.Its reason is: K2CO3On the one hand alkali metal, which can be played, plays catalytic action to the reduction process of NOx；In addition
K2CO3The part CO decomposited2The CO of gas phase is generated with solid C, further promotes the reduction emission reduction of NOx.
Embodiment 17
The present embodiment substantially with embodiment 1, the difference is that also added 0.3% in fuel reforming treatment process~
3% CaCO3, 0.5% is added in the present embodiment, is compared with embodiment 1, so that the emission reduction efficiency of nitrogen oxides improves
4.5%.CaCO3It decomposes and generates CaO and CO2, one side CaO, which can play alkali metal and play to be catalyzed to the reduction process of NOx, to be made
With；Other part CO2The CO of gas phase is generated with solid C, further promotes the reduction emission reduction of NOx.
Embodiment 18
The present embodiment substantially with embodiment 1, the difference is that: fuel used in the present embodiment be international trade coal dust, should
The N element content of international trade coal dust is 0.92%, and H element content is 2.09%, by denatured fuel made by it, then by iron content original
The mixture dress of material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, down draft sintering, and in sintering flue gas
The NO of sintering flue gas is detected in main pipelineXAverage emission concentration, and record as shown in table 7.
Embodiment 19
The present embodiment substantially with embodiment 1, the difference is that: fuel used in the present embodiment be prosperous all sources coal dust,
The N element content of the coal dust is 0.90%, and H element content is 1.39%, by denatured fuel made by it, then by iron content original
The mixture dress of material, flux and denatured fuel is laid on trolley, is lighted a fire to mixture, down draft sintering, and in sintering flue gas
The NO of sintering flue gas is detected in main pipelineXAverage emission concentration, and record as shown in table 7.
Embodiment 20
The present embodiment substantially with embodiment 1, the difference is that: fuel used in the present embodiment is that wind is melted coal dust, should
The N element content of coal dust is 0.84%, and H element content is 0.54%, by denatured fuel made by it, then by iron-bearing material,
The mixture of flux and denatured fuel dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and is responsible in sintering flue gas
The NO of sintering flue gas is detected in roadXAverage emission concentration, and record as shown in table 7.
Embodiment 21
The present embodiment substantially with embodiment 1, the difference is that: fuel used in the present embodiment be coking coke powder, should
The N element content of coke powder is 1.03%, and H element content is 0.28%, by denatured fuel made by it, then by iron-bearing material,
The mixture of flux and denatured fuel dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and is responsible in sintering flue gas
The NO of sintering flue gas is detected in roadXAverage emission concentration, and record as shown in table 4.
Embodiment 22
The present embodiment substantially with embodiment 1, the difference is that: fuel used in the present embodiment be ironmaking coke powder, should
The N element content of coke powder is 0.89%, and H element content is 0.27%, by denatured fuel made by it, then by iron-bearing material,
The mixture of flux and denatured fuel dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and is responsible in sintering flue gas
The NO of sintering flue gas is detected in roadXAverage emission concentration, and record as shown in table 7.
Embodiment 23
The present embodiment substantially with embodiment 1, the difference is that: fuel used in the present embodiment be boat osmanthus coke powder, should
The N element content of coke powder is 0.80%, and H element content is 0.29%, by denatured fuel made by it, then by iron-bearing material,
The mixture of flux and denatured fuel dress is laid on trolley, is lighted a fire to mixture, down draft sintering, and is responsible in sintering flue gas
The NO of sintering flue gas is detected in roadXAverage emission concentration, and record as shown in table 7.
When using H content different fuel type, discharged nitrous oxides situation is had differences, and table 7 is variety classes
Fuel contains H, N amount and its discharged nitrous oxides concentration.
7 variety classes fuel of table contains H, N content and its discharged nitrous oxides concentration
By the data of table 7, as it can be seen that it has on the whole in fuel, the fewer discharged nitrous oxides concentration of H element is lower to become
Gesture；And for the N element in fuel, coking coke powder and several coal dusts are compared and analyzed into discovery, the N element in coking coke powder
Content is higher than several coal dusts, but its discharged nitrous oxides concentration is but far below several coal dusts, traces it to its cause and finds coking coke powder
Middle H element content is lower.
The researcher of research sintering process nitrogen oxides generally believes in terms of the control of source at present, controls in fuel
N element content can effectively control the discharge amount of nitrogen oxides.But by above-mentioned number it has been found that be compared to N element content,
H element content also have a large impact on the concentration of emission of fuel nitrogen oxides, or even plays than N element and more importantly make
With, and pass through the formation mechanism of research nitrogen oxides, N is converted to the process of NOx in discovery fuel are as follows:
N+H+C=HCN
HCN+O=NCO+H
NCO+O=NO+CO
It can be seen that catalyst is played the role of in conversion of the presence of H to N to NO in fuel in fuel, therefore reduce in fuel
The emission reduction of sintering process nitrogen oxides may be implemented in H element content to a certain extent.
Embodiment 24
The present embodiment substantially with embodiment 1, the difference is that: by the cigarette in the bellows 600 of 700 middle and back of pallet
Gas introduces reunion room by air-introduced machine 110, and wherein the bellows 600 of 700 middle and back of pallet are 700 length direction of pallet
2/3 to the corresponding bellows 600 in lower section at tail position.
It successively include collapsible tube along flow of flue gas direction herein it should be noted that above-mentioned reunion room is Venturi
211, Cylindrical connecting tube 212 and expansion pipe 213；Reunion outdoor is provided with reunion liquid reservoir 221, and reunion liquid reservoir 221 is logical
It crosses air compressor machine 222 and is connected to reunion chamber interior, store misty agglomerator in reunion liquid reservoir 221, misty agglomerator can be with
It is sprayed by air compressor machine 222 to reunion chamber interior.
Agglomerator used in the present embodiment is the mixing of polyacrylamide, sodium carboxymethylcellulose or polymer alumina
Object；Sintering flue gas is introduced into electrostatic precipitator 300 after reunion is handled and is dusted, and the flue gas after dedusting enters desulfurizing tower 400
Middle carry out desulfurization.The PM of sintering flue gas is then detected in the flue collector 100 at 400 rear of desulfurizing tower10And SO2Average emission it is dense
Degree, and record as shown in table 8.
PM in 8 flue gas of table10And SO2Average emission concentration
(1) embodiment 1 and comparative example 1 are compared into discovery, is made in embodiment 1 by the use of electrostatic precipitator 300
Obtain PM10Average emission concentration from 20.6mg/m3Drop to 16.2mg/m3, illustrate another by the use of electrostatic precipitator 300
Determine to carry out emission reduction to the fine particle in sintering flue gas in degree；Embodiment 24 and embodiment 1, comparative example 1 are carried out pair again
Than discovery, the fine particle in sintering flue gas is first carried out to chemical agglomeration can improve the emission reduction effect of its fine particle,
Its reason is:
Chemical radicals are carried out mainly for the fine particle in the flue gas in the bellows 600 of pallet middle and back first
Poly-, reason is that the sintering feed sintering process above pallet middle and back comes into coda, the mistake wet bands in sinter bed
Thickness is decreased or wet bands excessively have completely disappeared, and filtration of the sinter bed due to losing wet bands at this time is burnt
Fine particle in ramming material layer is brought into flue collector 100 by exhausting air-flow, so in the bellows 600 of pallet middle and back
Fine particle content in flue gas is more, so needing in the flue gas in the bellows 600 for being directed to pallet middle and back
Fine particle carry out chemical agglomeration.
After flue gas can be introduced to the arrival end of collapsible tube 211 by air-introduced machine 110 in flue collector 100, Jin Eryan
Gas enters collapsible tube 211 by the arrival end of collapsible tube 211；Then flue gas flows into expansion pipe 213 by Cylindrical connecting tube 212；Flue gas
During flowing into collapsible tube 211, due to the continuous reduction of 211 caliber of collapsible tube, so that the flue gas flow rate in collapsible tube 21
It increases rapidly, and the agglomerator droplet high velocity impact in pipeline, so that the fine particle in flue gas is agglomerated agent droplet
Sufficiently wetting and adherency；When then flue gas enters expansion pipe 213, since flue gas flow rate is higher so being easy in expansion pipe 213
Negative pressuren zone is formed, which promotes forming core between fine particle and agglomerator droplet, collide, grow up, and forms bulky grain group
Polymers.Then bulky grain aggregate enters in electrostatic precipitator 300 with flue gas, and electrostatic precipitator 300 is easier to be adsorbed and removed
Large-sized particulate matter so bulky grain aggregate is easier to be trapped by electrostatic precipitator 300, and then realizes fine particle
Effective emission reduction.
(2) embodiment 1, embodiment 24 and comparative example 1 are compared, discovery uses in sintering flue gas after desulfurizing tower 400
SO2Average emission concentration from 659mg/m3Drop to 197.7mg/m3And 180.2mg/m3.The use of desulfurizing tower 400 can be right
SO in sintering flue gas2Carry out effective emission reduction.
The present invention is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that can not take off
It is carry out various modifications in the case where from the scope of the present invention being defined by the following claims and modification.Detailed description and drawings
Should be to be considered only as it is illustrative and not restrictive, if there is any such modifications and variations, then they all will
It falls into the scope of the present invention described herein.In addition, Development Status and meaning that background technique is intended in order to illustrate this technology,
It is not intended to limit the present invention or the application and application field of the invention.
Claims (10)
1. a kind of discharge-reducing method of Ore Sintering Process flue gas pollutant, it is characterised in that: step are as follows:
(1) fuel reforming is handled
Quick lime is added in fuel under conditions of water is not added and carries out dry-mixed, obtained denatured fuel；
(2) sintering feed is prepared
Iron-bearing material, flux are mixed with denatured fuel, pelletize to obtain mixture；
(3) down draft sintering
Mixture dress is laid on pallet (700), is lighted a fire to mixture, down draft sintering；
(4) fume treatment
Sintering flue gas during down draft sintering enters flue collector (100) by the bellows (600) of pallet (700) bottom, and
Electrostatic precipitator (300) are installed to be dusted on flue collector (100), flue gas is taken out after electrostatic precipitation through exhaust fan (500)
Enter desulfurizing tower (400) and carry out flue gas desulfurization, the flue gas after desulfurization is discharged through chimney (800).
2. a kind of discharge-reducing method of Ore Sintering Process flue gas pollutant according to claim 1, it is characterised in that: step
(1) quick lime additional amount is the 0.25%~5% of fuel gross mass in.
3. a kind of discharge-reducing method of Ore Sintering Process flue gas pollutant according to claim 1, it is characterised in that: will be sintered
Flue gas in the bellows (600) of trolley middle and back introduces reunion room by air-introduced machine (110), and sprays into and reunite into reunion room
Agent, sintering flue gas are introduced into electrostatic precipitator (300) after reunion is handled and are dusted.
4. a kind of Ore Sintering Process nitrogen oxides discharge-reducing method according to claim 1, it is characterised in that: in step (1)
Fuel of the granularity less than 1.0mm and granularity are greater than the ratio between the quality of fuel of 1.0mm are as follows: 1~1.86.
5. a kind of Ore Sintering Process nitrogen oxides discharge-reducing method according to claim 2, it is characterised in that: in step (1)
Quick lime additional amount is the 0.5%~3% of fuel gross mass.
6. a kind of discharge-reducing method of Ore Sintering Process flue gas pollutant according to claim 3, it is characterised in that: sintering platform
The bellows (600) of vehicle (700) middle and back are the corresponding bellows in lower section at pallet (700) length direction 2/3 to tail position
(600)。
7. a kind of discharge-reducing method of Ore Sintering Process flue gas pollutant according to claim 3, it is characterised in that: described
Reunion room be Venturi, the agglomerator be polyacrylamide, sodium carboxymethylcellulose or polymer alumina any one or
Any two or more mixture of person.
8. a kind of Ore Sintering Process nitrogen oxides discharge-reducing method according to claim 4, it is characterised in that: granularity is less than
The percentage that the fuel of 0.5mm accounts for fuel gross mass is 25%~30%.
9. a kind of Ore Sintering Process nitrogen oxides discharge-reducing method according to claim 4, it is characterised in that: granularity is greater than
The percentage that the fuel of 3mm accounts for fuel gross mass is less than or equal to 20%.
10. wanting a kind of any one of 1~9 Ore Sintering Process nitrogen oxides discharge-reducing method according to right, it is characterised in that: raw
Partial size is not less than 80% less than the accounting of 200 mesh in lime.
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