CN104567441B - The enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas - Google Patents
The enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas Download PDFInfo
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- CN104567441B CN104567441B CN201410789581.1A CN201410789581A CN104567441B CN 104567441 B CN104567441 B CN 104567441B CN 201410789581 A CN201410789581 A CN 201410789581A CN 104567441 B CN104567441 B CN 104567441B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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Abstract
The invention discloses a kind of enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas, after head flue gas is first passed through condensation removing part steam, converge with tail flue gas and be recycled in the petticoat pipe covering on sintering machine for agglomeration for iron mine together with circulating flue gas, make to enter into O in the gas of sinter bed by being blended into oxygen2Concentration meets the requirement of fuel combustion, and the head flue gas that it recycles and tail flue gas account for the 70% ~ 80% of flue gas cumulative volume so that CO in the middle part flue gas not circulated2Concentration is greatly improved, then carries out CO to the middle part flue gas not circulated2Separation and recycling.The present invention has that separative efficiency is high, the feature of advantage of lower cost, and does not interferes with yield and the quality index of sintering deposit, substantially achieves the zero-emission of sintering flue gas.
Description
Technical field
The present invention relates to a kind of method of agglomeration for iron mine smoke gas treatment, be specifically related to a kind of enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas.
Background technology
Being sintered to blast furnace ironmaking provides the iron-containing charge of more than 75%, is the important source material manufacturing procedure of iron and steel enterprise, is also typical high energy consumption, high pollution link, and its process energy consumption is the 9%-12% of iron and steel enterprise's total energy consumption, is only second to Iron-smelting and occupies second.Coal base solid burnup accounts for the 80% of sintering total energy consumption, and combustion of fossil fuel is COx、SOx、NOxThe main source producing Deng multiple pollutant, is the main cause causing greenhouse effects, acid rain and depletion of the ozone layer three overall situation problem.Currently, flue gas pollutant SO is sinteredxTreatment process commercialization, NOxImprovement is in demonstrates or the trail run stage, but COxTreatment process be still in starting stage of exploitation.Therefore, CO is developedxEfficiently control technology, be the emphasis problem that sintering cleaning produces.
Current sintering flue gas CO2Reduce discharging mainly by improving energy utilization efficiency reducing Fossil fuel consumption, thus reduce CO in sintering process2Generation.But the reduction of solid burnup is limited, to fundamentally control CO2Discharge capacity, be necessary for sintering flue gas in CO2Reclaim and utilize.Reclaim CO at present2The mainly method by separating, trap, is divided into absorption absorption method, membrane separation process and cryogenic separation technology etc., but due to CO in sintering flue gas2Concentration low (normally only 6% ~ 10%) and exhaust gas volumn are big so that recovery difficult is big, technological process is complicated, processing cost is high, energy consumption is big.Therefore, control sintering flue gas CO2That discharge it is crucial that carry out enrichment to it and make it easy to reclaim.
CO for low-concentration flue gas2Beneficiation technologies, its research is concentrated mainly on coal combustion field, and main method has pre-combustion capture and chemical chain burning technology etc..Owing to the solid fuel distribution of agglomeration for iron mine is in sinter bed, pre-combustion capture and burning chemistry chains are changed due to chemical energy and are difficult in sinter bed realize, both is enriched with CO2Technology all can not directly apply.It at sintering art, is not specifically designed for CO in enriched flue gas2Research report, only flue gas recirculation sintering technology be accompanied with enrichment CO2Effect.But owing to the ratio of flue gas recirculation is mostly about 35% so that CO2Enrichment degree is limited, and concentration typically can only bring up to 10% ~ 20% from 6% ~ 10%, does not reaches CO2The concentration requirement efficiently separate, trapping.
Content of the invention
The technical problem to be solved in the present invention is the deficiency overcoming prior art to exist, and provides that a kind of separative efficiency is high, cost is relatively low, can substantially realize sintering flue gas zero-emission and not interfere with the yield of sintering deposit and the enriching and recovering method of the agglomeration for iron mine carbon dioxide in flue gas of quality index.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas, sintering flue gas in sintering machine is divided into head flue gas, middle part flue gas and tail flue gas along sintering machine length direction, head flue gas accounts for the 50% ~ 55% of flue gas cumulative volume, middle part flue gas accounts for the 20% ~ 30% of flue gas cumulative volume, and tail flue gas accounts for the 20% ~ 25% of flue gas cumulative volume；Head flue gas in sintering machine is mixed as circulating flue gas with tail flue gas after dehydration pretreatment and in circulating flue gas, adds a certain amount of O2The petticoat pipe delivering to sintering machine after the extremely satisfied sintering requirement of regulation oxygen content carries out agglomeration for iron mine, the middle part flue gas in sintering machine is derived and carries out CO2Separation and recycling.
Above-mentioned method, it is preferred that control the temperature of described circulating flue gas be 110 ~ 130 DEG C, the volumetric concentration of steam be 4% ~ 8%, described O2Addition be control circulating flue gas in O2Volumetric concentration be 24% ~ 30%.
Above-mentioned method, preferably, described head flue gas uses condensing mode to carry out dehydration pretreatment, the temperature of described circulating flue gas is controlled by the temperature after regulation head flue gas condensing, and in described circulating flue gas, the volumetric concentration of steam is controlled by the volumetric concentration of steam after regulation head flue gas condensing.
Above-mentioned method, it is preferred that described middle part flue gas carries out CO2Separation and recycling refer to, middle part flue gas first carries out dedusting, desulfurization, and then condensation dehydration is to CO2Volumetric concentration be 85% ~ 90%, then by compress and liquefy obtain mass percent more than 97% liquid CO2。
Above-mentioned method, it is preferred that described middle part flue gas is to be derived by the middle part cycle flue under bellows in the middle part of sintering machine, then removing dust device, air exhauster, desulphurization system, condensing unit and compress and liquefy device and complete CO successively2Separation and recycling.
Above-mentioned method, it is preferred that described CO2Separation and recycling in, residue flue gas and circulating flue gas after separating liquefaction converge to be recycled in petticoat pipe and carry out agglomeration for iron mine.
Above-mentioned method, it is preferred that described petticoat pipe is completely covered sintering machine.
Above-mentioned method, it is preferred that join the O in circulating flue gas2It for industry pure oxygen, and is to be added in the way of being added directly in petticoat pipe.
Above-mentioned method, preferably, described head flue gas is derived by the Header cyclic flue under sintering machine head bellows, and the tail flue gas derived with the afterbody cycle flue under sintering machine afterbody bellows after condensed device condensation dehydration mixes, then removing dust device, air exhauster enter in petticoat pipe successively.
The division principle sintering flue gas in above-mentioned sintering machine is: head flue gas is the bellows beginning to ramp up to EGT from igniting section, accounts for the 50% ~ 55% of sintering machine length；Middle part flue gas is high SO after EGT rises2, the bellows of high dust, account for the 20% ~ 30% of sintering machine length；Tail flue gas is O2Content begins to ramp up the bellows that sintering terminates, and accounts for flue gas cumulative volume 20% ~ 25%.
Compared with prior art, it is an advantage of the current invention that: the present invention utilizes the feature of sintering flue gas, sintering flue gas in sintering machine is divided into head flue gas, middle part flue gas and tail flue gas, by the head flue gas of amount of flue gas emission 70% ~ 80% will be accounted for and tail flue gas is circulated, make CO in the middle part flue gas not circulated2Concentration is greatly improved, middle part flue gas CO after dehydration2Concentration reaches 85% ~ 90%, and middle part flue gas can directly compress and liquefy liquid CO that isolated high-purity has economic worth2, solve sintering flue gas CO2Concentration is low, be difficult to the problem that reclaims, has that separative efficiency is high, the feature of advantage of lower cost；By carrying out dehydration pretreatment to head flue gas so that in circulating flue gas, the content of steam meets the requirement of sintering, makes circulating flue gas reach a certain degree of oxygen-enriched by being blended into oxygen, disclosure satisfy that sintering process fuel combustion to O simultaneously2The requirement of content, and ensure that whole sintering process uses without N2Sintering, yield and the quality index of ultimate guarantee sintering deposit are unaffected.The present invention also can be further by CO2During recovery, remnants' is a small amount of with O2Based on gas converge in circulating flue gas, not only can the oxygen content of replenishment cycles flue gas, and substantially achieve the zero-emission of sintering flue gas.
In sum, present invention CO in realizing efficient, low cost to sintering flue gas2While recycling, substantially achieve the zero-emission of sintering flue gas, and do not interfere with yield and the quality index of sintering deposit, have great importance thus for agglomeration for iron mine cleaning production.
Brief description
Fig. 1 is the principle schematic of the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas of the present invention.
Marginal data:
1st, sintering machine；2nd, distribution device；3rd, igniter；4th, petticoat pipe；5th, Header cyclic flue；6th, middle part flue；7th, afterbody cycle flue；8th, the first deduster；9th, the first air exhauster；10th, desulphurization system；11st, the first condensing unit；12nd, device is compressed and liquefied；13rd, the second condensing unit；14th, the second deduster；15th, the second air exhauster.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but protection scope of the present invention is not limited to embodiment in detail below.
As shown in Figure 1, the distribution device 2 of sintering machine 1 and igniter 3 are arranged on head position, sintering machine 1 is divided into head L1, middle part L2 and afterbody L3 along its length, wherein, head L1 accounts for the 50% ~ 55% of sintering machine 1 length, middle part L2 accounts for the 20% ~ 30% of sintering machine 1 length, and afterbody L3 accounts for the 20% ~ 25% of sintering machine 1 length, and petticoat pipe 4 is positioned at sintering machine 1 top and sintering machine 1 is completely covered.The bellows of head L1 are connected with Header cyclic flue 5, the bellows of afterbody L3 are connected with afterbody cycle flue 7, Header cyclic flue 5 connects the import of the second condensing unit 13 by pipeline, after the outlet conduit of the second condensing unit 13 and the connection pipeline of afterbody cycle flue 7 converge, then pass sequentially through the second deduster 14 and the second air exhauster 15 is connected with petticoat pipe 4.Flue 6 in the middle part of the bellows connection of middle part L2, the outlet of middle part flue 6 is sequentially connected with the first deduster the 8th, the first air exhauster the 9th, desulphurization system the 10th, the first condensing unit 11 and compresses and liquefies device 12, and the residue exhanst gas outlet compressing and liquefying device 12 passes through the outlet conduit connection of pipeline and the second condensing unit 13.
Embodiment 1:
Raw materials for sintering condition: according to mixing the quality of iron ore the 61.41%th, dolomite the 5.61%th, lime stone the 2.05%th, quick lime the 3.85%th, sinter return fine the 23.08%th, coke powder 4.00% than dispensing (obtain sintering deposit main chemical compositions be: TFe58.33%, SiO25.0%, R1.9, MgO2.3%).It is distributed into above-mentioned raw materials for sintering in sintering machine 1 by distribution device 2 and be sintered.
By account for flue gas cumulative volume 50% head flue gas derive first pass through the second condensing unit 13 condense removing part steam after, converge formation circulating flue gas with the tail flue gas accounting for flue gas cumulative volume 20%, circulating flue gas is passed in the petticoat pipe 4 being completely covered on sintering machine 1 through the second deduster 14 and the second air exhauster 15 successively, it is blended into industry pure oxygen in petticoat pipe 4, simultaneously by the temperature after control head flue gas condensing and the volumetric concentration of steam so that entering the volumetric concentration of steam in the gas of sinter bed is the 8%th, O2Volumetric concentration be 24%, the temperature of gas is 130 DEG C；The middle part flue gas accounting for flue gas cumulative volume 30% is derived and carries out CO2Separation and recycling, middle part flue gas successively through the first deduster the 8th, the first air exhauster the 9th, desulphurization system the 10th, the first condensing unit 11 with compress and liquefy device 12 and carry out dedusting, desulfurization and condensation dehydration, CO in the middle part flue gas after condensation dehydration2Volumetric concentration reach 90%, then obtain, by compressing and liquefying, liquid CO that purity is 98%2, liquefaction separate after the outlet conduit that is passed through to the second condensing unit 13 of residue flue gas converge with circulating flue gas together be recycled to the petticoat pipe 4 of sintering machine 1 and reuse.The enriching and recovering method of the present embodiment carbon dioxide, makes CO2Being recycled utilization, the Yield and quality index of sintering deposit is substantially unaffected, and is simultaneously achieved the zero-emission of sintering flue gas.
Embodiment 2:
Raw materials for sintering condition: according to mixing the quality of iron ore the 61.22%th, dolomite the 5.01%th, lime stone the 2.33%th, quick lime the 4.51%th, sinter return fine the 23.08%th, coke powder 3.85% than dispensing (obtain sintering deposit main chemical compositions be: TFe57.7%, SiO24.9%, R2.0, MgO1.8%).It is distributed into above-mentioned raw materials for sintering in sintering machine 1 by distribution device 2 and be sintered.
By account for flue gas cumulative volume 55% head flue gas derive after first pass through the second condensing unit 13 condense removing part steam after, converge formation circulating flue gas with the tail flue gas accounting for flue gas cumulative volume 25%, circulating flue gas is passed in the petticoat pipe 4 being completely covered on sintering machine 1 through the second deduster 14 and the second air exhauster 15 successively, it is blended into industry pure oxygen in petticoat pipe 4, simultaneously by the temperature after control head flue gas condensing and the volumetric concentration of steam so that entering the volumetric concentration of steam in the gas of sinter bed is the 4%th, O2The temperature of volumetric concentration the 30%th, gas be 110 DEG C；The middle part flue gas accounting for flue gas cumulative volume 20% is carried out CO2Separation and recycling, middle part flue gas successively through the first deduster the 8th, the first air exhauster the 9th, desulphurization system the 10th, the first condensing unit 11 with compress and liquefy device 12 and carry out dedusting, desulfurization and condensation dehydration, CO in the middle part flue gas after condensation dehydration2Volumetric concentration reach 85%, then obtain, by compressing and liquefying, liquid CO that purity is 98%2, liquefaction separate after the outlet conduit that is passed through to the second condensing unit 13 of residue flue gas converge with circulating flue gas together be recycled to sintering machine petticoat pipe and reuse.The enriching and recovering method of the present embodiment carbon dioxide, makes CO2Being recycled utilization, the Yield and quality index of sintering deposit is substantially unaffected, and is simultaneously achieved the zero-emission of sintering flue gas.
Claims (8)
1. the enriching and recovering method of an agglomeration for iron mine carbon dioxide in flue gas, it is characterized in that: the sintering flue gas in sintering machine is divided into head flue gas, middle part flue gas and tail flue gas along sintering machine length direction, head flue gas accounts for the 50% ~ 55% of flue gas cumulative volume, middle part flue gas accounts for the 20% ~ 30% of flue gas cumulative volume, and tail flue gas accounts for the 20% ~ 25% of flue gas cumulative volume；Head flue gas in sintering machine is mixed as circulating flue gas with tail flue gas after dehydration pretreatment and in circulating flue gas, adds a certain amount of O2The petticoat pipe delivering to sintering machine after the extremely satisfied sintering requirement of regulation oxygen content carries out agglomeration for iron mine, the middle part flue gas in sintering machine is derived and carries out CO2Separation and recycling；Described middle part flue gas carries out CO2Separation and recycling refer to, middle part flue gas first carries out dedusting, desulfurization, and then condensation dehydration is to CO2Volumetric concentration be 85% ~ 90%, then by compress and liquefy obtain mass percent more than 97% liquid CO2。
2. the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas according to claim 1, it is characterised in that: control the temperature of described circulating flue gas be 110 ~ 130 DEG C, the volumetric concentration of steam be 4% ~ 8%, described O2Addition be control circulating flue gas in O2Volumetric concentration be 24% ~ 30%.
3. the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas according to claim 2, it is characterized in that: described head flue gas uses condensing mode to carry out dehydration pretreatment, the temperature of described circulating flue gas is controlled by the temperature after regulation head flue gas condensing, and in described circulating flue gas, the volumetric concentration of steam is controlled by the volumetric concentration of steam after regulation head flue gas condensing.
4. the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas according to claim 1, it is characterized in that: described middle part flue gas is to be derived by the middle part cycle flue under bellows in the middle part of sintering machine, then removing dust device, air exhauster, desulphurization system, condensing unit and compress and liquefy device and complete CO successively2Separation and recycling.
5. the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas according to claim 1, it is characterised in that: described CO2Separation and recycling in, residue flue gas and circulating flue gas after separating liquefaction converge to be recycled in petticoat pipe and carry out agglomeration for iron mine.
6. the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas according to claim 1, it is characterised in that: described petticoat pipe is completely covered sintering machine.
7. the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas according to claim 1, it is characterised in that: join the O in circulating flue gas2It for industry pure oxygen, and is to be added in the way of being added directly in petticoat pipe.
8. the enriching and recovering method of agglomeration for iron mine carbon dioxide in flue gas according to claim 1, it is characterized in that: described head flue gas is derived by the Header cyclic flue under sintering machine head bellows, the tail flue gas derived with the afterbody cycle flue under sintering machine afterbody bellows after condensed device condensation dehydration mixes, then removing dust device, air exhauster enter in petticoat pipe successively.
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| CN106367156B (en) * | 2016-10-14 | 2018-04-06 | 贵州理工学院 | A kind of burning chemistry chains oxygen carrier and its application process |
| CN114432809A (en) * | 2021-12-31 | 2022-05-06 | 安徽华塑股份有限公司 | Lime kiln carbon dioxide entrapment utilizes system |
| CN114508937B (en) * | 2022-01-24 | 2023-11-10 | 中南大学 | Method for treating calcium sulfate-containing solid waste in variable atmosphere |
| CN114849431A (en) * | 2022-04-29 | 2022-08-05 | 秦皇岛新特科技有限公司 | Air box assembly, clinker production device and flue gas pollutant treatment equipment |
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