CN107131770B - A kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxMethod - Google Patents

A kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxMethod Download PDF

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Publication number
CN107131770B
CN107131770B CN201710250343.7A CN201710250343A CN107131770B CN 107131770 B CN107131770 B CN 107131770B CN 201710250343 A CN201710250343 A CN 201710250343A CN 107131770 B CN107131770 B CN 107131770B
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denitration
low
flue gas
waste heat
flue
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CN107131770A (en
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王海风
张春霞
齐渊洪
郄俊懋
周和敏
严定鎏
王�锋
高建军
林万舟
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CISRI Sunward Technology Co Ltd
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CISRI SHENGHUA ENGINEERING TECHNOLOGY Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • 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
    • 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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F27D2017/006—Systems for reclaiming waste heat using a boiler
    • 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
    • Y02P10/25—Process efficiency
    • 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
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention relates to a kind of agglomeration for iron mine waste heats to recycle collaboration emission reduction SOxAnd NOxMethod, the flue gas treating process especially suitable for steel industry agglomeration for iron mine.This method can be used as enterprise's auxiliary construction of existing sintering desulfuration technique, and mature sintering flue gas desulfurization process also may be selected and create together.This method comprises: the high NO of low temperaturexLow SOxFlue gas and sinter heat exchange and the high SO of denitrating technique, high temperaturexLow NOxOff-gas recovery heat and the low SO of sulfur removal technology, high temperaturexLow NOxFlue gas recirculation technique.Process of the invention sufficiently recycles sinter and sintering flue gas waste heat, while reducing SOxAnd NOxThe advantages such as discharge has process short, strong applicability, and investment, operating cost are low, have very big application value.

Description

A kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxMethod
Technical field
The present invention relates to agglomeration for iron mine technical field more particularly to a kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOx and NOx method.
Background technique
For steel production in China based on the long process of blast furnace-converter, sinter accounts for about the 70%~75% of blast furnace burden, burns Tie process SO2Discharge and NOxDischarge accounts for about the 60% and 50% of steel process, is the main source of atmospheric pollution.Sintering flue gas at present Desulfurization is technically mature, method also there are many, the country builds up the sintering desulfuration facility that puts into operation, and there are about 1300 sets.And it is burning It makes little progress in terms of the construction for tying denitrating flue gas, the sintering denitrification apparatus that China has been reported that is less than 10, wherein generally acknowledging removing effect The relatively good active charcoal method of fruit, activated carbon technology can remove SO simultaneouslyx、NOxAnd dioxin and other unwanted volatiles, But the investment of the technique is big, operating cost is high, it is difficult to universal.Other SCR methods applied in power industry maturation, SNCR method denitration Technology cannot achieve since the temperature of sintering tail gas is low, if by tail gas heating to the energy of catalysis reaction required temperature consumption It is huge, it will also result in operating cost height.
In terms of sintering process UTILIZATION OF VESIDUAL HEAT IN, one side sintering process energy consumption is only second to blast furnace ironmaking, accounts for about iron and steel enterprise The UTILIZATION OF VESIDUAL HEAT IN ratio of the 11% of total energy consumption, another aspect sintering process is very low, and only 6%, there are about 0.9GJ for sinter per ton Thermal energy do not utilize.Mainly have on Land use systems and carries out hot gas sintering, igniting combustion supporting, pre- thermal sintering using sinter waste heat Mine and cogeneration.Sintering air leak rate of air curtain is reduced, sintering mine sensible heat utilization efficiency is improved, is made using the sensible heat that sinter itself has Required temperature heat source is reacted for heat-agglomerating desulfidation tail gas to selective-catalytic-reduction denitrified (SCR), the angle from energy source There are enough guarantees.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxSide Method, to solve the problems, such as that existing capacity usage ratio is low, vent gas treatment higher cost.
The purpose of the present invention is mainly achieved through the following technical solutions:
A kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxMethod, agglomeration for iron mine waste heat recycling collaboration emission reduction SOx And NOxMethod includes: the high NO of low temperaturexLow SOxFlue gas and sinter heat exchange and the high SO of denitrating technique, high temperaturexLow NOxOff-gas recovery heat Amount and the low SO of sulfur removal technology, high temperaturexLow NOxFlue gas recirculation technique.
Agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxThe device systems that method uses include: sintering machine, sintering wind Case, denitration section flue, desulfurization section flue, electrostatic precipitator, denitration air-introduced machine, shaft cooler, gravitational precipitator, denitration dress It sets, device for generating power by waste heat, denitration discharge preceding deduster, denitration chimney, crusher, hot precipitator, desulfurization air-introduced machine, waste heat pot Deduster, desulfuration chimney, circulating flue gas section flue before furnace, power generator, desulfurizer, desulfurization are discharged；
From the entrance of sintering machine to outlet be arranged in sequence at least ten sintering bellows, by sintering machine entrance, successively Are as follows: denitration section flue, desulfurization section flue, circulating flue gas section flue；Denitration section flue includes the sintering that quantity is total quantity 60% Bellows；Desulfurization section flue includes the sintering bellows that quantity is total quantity 20%；Circulating flue gas section flue includes remaining sintering wind Case；
The outlet of sintering machine is arranged in crusher, and sinter after broken crusher machine, is fallen into perpendicular after sintering machine is sintered It is cooled down in formula cooler；
Denitration section flue, electrostatic precipitator, denitration air-introduced machine, shaft cooler, gravitational precipitator, denitrification apparatus, waste heat Deduster, denitration chimney are sequentially connected before power generator, denitration are discharged；Desulfurization section flue, hot precipitator, desulfurization air-introduced machine, Deduster, desulfuration chimney are sequentially connected before waste heat boiler, desulfurizer, desulfurization are discharged；Power generator is connect with waste heat boiler；It follows The connection of the entrance of ring flue gas section flue and sintering machine.
The high NO of low temperaturexLow SOxFlue gas and sinter heat exchange and denitrating technique specifically:
The high NO of low temperaturexLow SOxFlue gas by denitration air-introduced machine, introduce denitration section flue, start the mistake with sinter heat exchange Journey, the high NO of low temperaturexLow SOxFlue gas be dusted by electrostatic precipitator, into shaft cooler, with broken sinter It exchanges heat and is higher than 350 DEG C to temperature；
Flue gas after heat exchange carries out denitration by denitrification apparatus after dedusting, after denitration by gravitational precipitator dedusting again Flue gas generated electricity by device for generating power by waste heat, arranged after deduster dedusting through denitration chimney before residual gas is discharged by denitration It puts.
The high NO of low temperaturexLow SOxFlue gas: 70-100 DEG C of temperature, SOxConcentration 50-150mg/m3, NOxConcentration 100-300mg/ m3；
Denitrification apparatus uses selective-catalytic-reduction denitrified (SCR) principle；Catalyst can use V2O5-WO3/TiO2、 V2O5-MoO3/TiO2、V2O5/TiO2；Reducing agent uses ammonia vapor, is obtained by evaporator and is greater than or equal to dust-removal and desulfurizing tail The ammonia vapor of temperature degree.
The high SO of high temperaturexLow NOxOff-gas recovery heat and sulfur removal technology specifically:
The high SO of high temperaturexLow NOxFlue gas by desulfurization air-introduced machine, introduce desulfurization section flue, start the process for recycling heat, The high SO of high temperaturexLow NOxFlue gas be dusted by hot precipitator, generate electricity into waste heat boiler, and by power generator 150 DEG C are dropped to hereinafter, then the low-temperature flue gas after power generation is passed through desulfurization and discharged by desulfurizer progress desulfurization to flue-gas temperature It is discharged after preceding deduster dedusting through desulfuration chimney.
The high SO of high temperaturexLow NOxFlue gas: 200-300 DEG C of temperature, SOxConcentration 300-1500mg/m3, NOx concentration 20- 100mg/m3；
Desulfurizer carries out desulfurization using dry method or semidry method or wet process.
The low SO of high temperaturexLow NOxFlue gas recirculation technique specifically:
The low SO of high temperaturexLow NOxFlue gas by being passed into the entrance of sintering machine again, again after circulating flue gas section flue Participate in the Ore Sintering Process in sintering machine.
The low SO of high temperaturexLow NOxFlue gas: 400-500 DEG C of temperature, SOxConcentration 100-200mg/m3, NOxConcentration 20-100mg/ m3。
A kind of realization agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxThe agglomeration for iron mine waste heat recycling collaboration of method subtracts Arrange SOxAnd NOxDevice systems, which is characterized in that the device systems include: sintering machine, sintering bellows, denitration section flue, desulfurization Section flue, electrostatic precipitator, denitration air-introduced machine, shaft cooler, gravitational precipitator, denitrification apparatus, device for generating power by waste heat, denitration Deduster, denitration chimney, crusher, hot precipitator, desulfurization air-introduced machine, waste heat boiler, power generator, desulfurization dress before discharging It sets, preceding deduster, desulfuration chimney, circulating flue gas section flue are discharged in desulfurization；
From the entrance of sintering machine to outlet be arranged in sequence at least ten sintering bellows, by sintering machine entrance, successively Are as follows: denitration section flue, desulfurization section flue, circulating flue gas section flue；Denitration section flue includes the sintering that quantity is total quantity 60% Bellows；Desulfurization section flue includes the sintering bellows that quantity is total quantity 20%；Circulating flue gas section flue includes remaining sintering wind Case；
The outlet of sintering machine is arranged in crusher, and sinter after broken crusher machine, is fallen into perpendicular after sintering machine is sintered It is cooled down in formula cooler；
Denitration section flue, electrostatic precipitator, denitration air-introduced machine, shaft cooler, gravitational precipitator, denitrification apparatus, waste heat Deduster, denitration chimney are sequentially connected before power generator, denitration are discharged；Desulfurization section flue, hot precipitator, desulfurization air-introduced machine, Deduster, desulfuration chimney are sequentially connected before waste heat boiler, desulfurizer, desulfurization are discharged；Power generator is connect with waste heat boiler；It follows The connection of the entrance of ring flue gas section flue and sintering machine.
The present invention has the beneficial effect that:
1, the present invention takes full advantage of the sensible heat resource of sinter, and the mesh that operating cost realizes economic denitration is greatly lowered 's；
2, process strong applicability of the invention can be directed to different sintering machine device configurations, both can be used for built At sintering desulfuration enterprise desulfuring and denitrifying apparatus can also be built simultaneously in newly-built enterprise；It is not only suitable for ring cold machine and straight line cooler The sinter type of cooling is also applied for the Novel vertical pot type sinter type of cooling；
3, present invention tail gas residual heat resources after denitration make full use of, and tail gas can access existing fume afterheat pot after denitration Furnace system, it can also be used to which sintering machine itself carries out hot gas sintering, igniting combustion supporting or pre- heat sinter.
Other features and advantages of the present invention will illustrate in the following description, and become aobvious and easy from specification See, or understand through the implementation of the invention.The objectives and other advantages of the invention can be by wanting in written specification, right Specifically noted structure is sought in book and attached drawing to be achieved and obtained.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing In, identical reference symbol indicates identical component.
Fig. 1 is a kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxThe apparatus and process flow chart of method.
In figure: 1- sintering machine, 2- sintering bellows, 3- denitration section flue, 4- desulfurization section flue, 5- electrostatic precipitator, 6- are de- Nitre air-introduced machine, 7- shaft cooler, 8- gravitational precipitator, 9- denitrification apparatus, 10- device for generating power by waste heat, 11-1- denitration discharge Preceding deduster, 11-2- denitration chimney, 12- crusher, 13- hot precipitator, 14- desulfurization air-introduced machine, 15- waste heat boiler, 16- Deduster, 18-2- desulfuration chimney, 19- circulating flue gas section flue before power generator, 17- desulfurizer, 18-1- desulfurization are discharged.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and Together with embodiments of the present invention for illustrating the principle of the present invention.
As shown in Figure 1, arrow direction is pallet traffic direction in figure.A kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxMethod, agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxMethod includes: the high NO of low temperaturexLow SOxFlue gas and burning Tie mine heat exchange and the high SO of denitrating technique, high temperaturexLow NOxOff-gas recovery heat and the low SO of sulfur removal technology, high temperaturexLow NOxFlue gas recirculation Technique.
Agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxThe device systems that method uses include: sintering machine 1, sintering wind Case 2, denitration section flue 3, desulfurization section flue 4, electrostatic precipitator 5, denitration air-introduced machine 6, shaft cooler 7, gravitational precipitator 8, Deduster 11-1, denitration chimney 11-2, crusher 12, high-temperature dust removal before denitrification apparatus 9, device for generating power by waste heat 10, denitration are discharged Deduster 18-1, desulfurization before device 13, desulfurization air-introduced machine 14, waste heat boiler 15, power generator 16, desulfurizer 17, desulfurization are discharged Chimney 18-2, circulating flue gas section flue 19；
From the entrance of sintering machine 1 to outlet be arranged in sequence at least ten sintering bellows 2, by 1 entrance of sintering machine, according to It is secondary are as follows: denitration section flue 3, desulfurization section flue 4, circulating flue gas section flue 19；Denitration section flue 3 includes that quantity is total quantity 60% sintering bellows 2；Desulfurization section flue 4 includes the sintering bellows 2 that quantity is total quantity 20%；Circulating flue gas section flue 19 Including remaining sintering bellows 2；When the above ratio is unable to get integer, reduces result and be rounded downwards；
The outlet of sintering machine 1 is arranged in crusher 12, and sinter is after the sintering of sintering machine 1, after being crushed by crusher 12, It falls into shaft cooler 7 and is cooled down；
Denitration section flue 3, electrostatic precipitator 5, denitration air-introduced machine 6, shaft cooler 7, gravitational precipitator 8, denitrification apparatus 9, deduster 11-1, denitration chimney 11-2 are sequentially connected before device for generating power by waste heat 10, denitration are discharged；Desulfurization section flue 4, high temperature remove Before dirt device 13, desulfurization air-introduced machine 14, waste heat boiler 15, desulfurizer 17, desulfurization are discharged deduster 18-1, desulfuration chimney 18-2 according to It is secondary to be connected；Power generator 16 is connect with waste heat boiler 15；Circulating flue gas section flue 19 is connect with the entrance of sintering machine 1.
The high NO of low temperaturexLow SOxFlue gas and sinter heat exchange and denitrating technique specifically:
The high NO of low temperaturexLow SOxFlue gas by denitration air-introduced machine 6, introduce denitration section flue 3, start and sinter heat exchange Process, the high NO of low temperaturexLow SOxFlue gas be dusted by electrostatic precipitator 5, into shaft cooler 7, with broken burning Knot mine, which exchanges heat, is higher than 350 DEG C to temperature；
The heat exchange mode that heat transfer process can be suitable for according to the different sinter type of cooling selection of sintering machine 1, it is possible to use Sinter ring cold machine, straight line cooler or perpendicular pot type；
Flue gas after heat exchange passes through the dedusting again of gravitational precipitator 8, it is possible to use other high-temperature dust removal modes guarantee hot tail Concentration needed for gas dustiness is lower than selective catalytic reduction (SCR) denitration；Denitration, selection are carried out by denitrification apparatus 9 after dedusting Property catalysis reduction (SCR) denitration unit be a standalone module, can directly select the selective catalytic reduction (SCR) of existing maturation Denitration mode, also for sintering desulfuration tail gas NOxContent feature develops special-purpose catalyst；Flue gas after denitration passes through cogeneration Device 10 generates electricity, and discharges after deduster 11-1 dedusting through denitration chimney 11-2 before residual gas is discharged by denitration；Denitration Flue gas also may be incorporated into built 15 high-temperature flue gas system of sintering exhaust-heat boiler heating steam and be incorporated to steam pipe network or directly hair afterwards Electricity, it can also be used to 1 hot gas sintering of sintering machine, igniting combustion supporting, pre- heat sinter.
The high NO of low temperaturexLow SOxFlue gas: 70-100 DEG C of temperature, SOxConcentration 50-150mg/m3, NOxConcentration 100-300mg/ m3；
Denitrification apparatus 9 uses selective-catalytic-reduction denitrified (SCR) principle；Catalyst can use V2O5-WO3/TiO2、 V2O5-MoO3/TiO2、V2O5/TiO2Or other are applicable to sintering desulfuration tail gas NOxThe low temperature catalyst of content feature；Reducing agent Using ammonia vapor, the ammonia vapor for being greater than or equal to dust-removal and desulfurizing exhaust temperature is obtained by evaporator.
The high SO of high temperaturexLow NOxOff-gas recovery heat and sulfur removal technology specifically:
The high SO of high temperaturexLow NOxFlue gas by desulfurization air-introduced machine 14, introduce desulfurization section flue 4, start the mistake for recycling heat Journey, the high SO of high temperaturexLow NOxFlue gas be dusted by hot precipitator 13, into waste heat boiler 15, and pass through power generator 16, which generate electricity, drops to 150 DEG C hereinafter, the low-temperature flue gas after power generation carries out desulfurization by desulfurizer 17, so to flue-gas temperature It is discharged after deduster 18-1 dedusting through desulfuration chimney 18-2 before being discharged afterwards by desulfurization.
The high SO of high temperaturexLow NOxFlue gas: 200-300 DEG C of temperature, SOxConcentration 300-1500mg/m3, NOxConcentration 20- 100mg/m3；
Desulfurizer 17 carries out desulfurization using dry method or semidry method or wet process.
The low SO of high temperaturexLow NOxFlue gas recirculation technique specifically:
The low SO of high temperaturexLow NOxFlue gas by being passed into the entrance of sintering machine 1 again after circulating flue gas section flue 19, then The primary Ore Sintering Process participated in sintering machine 1.
The low SO of high temperaturexLow NOxFlue gas: 400-500 DEG C of temperature, SOxConcentration 100-200mg/m3, NOxConcentration 20- 100mg/m3。
A kind of realization agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxThe agglomeration for iron mine waste heat recycling collaboration of method subtracts Arrange SOxAnd NOxDevice systems, which is characterized in that the device systems include: sintering machine 1, sintering bellows 2, denitration section flue 3, Desulfurization section flue 4, electrostatic precipitator 5, denitration air-introduced machine 6, shaft cooler 7, gravitational precipitator 8, denitrification apparatus 9, waste heat hair Deduster 11-1, denitration chimney 11-2, crusher 12, hot precipitator 13, desulfurization air-introduced machine before electric installation 10, denitration are discharged 14, deduster 18-1, desulfuration chimney 18-2, circulation cigarette before waste heat boiler 15, power generator 16, desulfurizer 17, desulfurization are discharged Gas section flue 19；
From the entrance of sintering machine 1 to outlet be arranged in sequence at least ten sintering bellows 2, by 1 entrance of sintering machine, according to It is secondary are as follows: denitration section flue 3, desulfurization section flue 4, circulating flue gas section flue 19；Denitration section flue 3 includes that quantity is total quantity 60% sintering bellows 2；Desulfurization section flue 4 includes the sintering bellows 2 that quantity is total quantity 20%；Circulating flue gas section flue 19 Including remaining sintering bellows 2；
The outlet of sintering machine 1 is arranged in crusher 12, and sinter is after the sintering of sintering machine 1, after being crushed by crusher 12, It falls into shaft cooler 7 and is cooled down；
Denitration section flue 3, electrostatic precipitator 5, denitration air-introduced machine 6, shaft cooler 7, gravitational precipitator 8, denitrification apparatus 9, deduster 11-1, denitration chimney 11-2 are sequentially connected before device for generating power by waste heat 10, denitration are discharged；Desulfurization section flue 4, high temperature remove Before dirt device 13, desulfurization air-introduced machine 14, waste heat boiler 15, desulfurizer 17, desulfurization are discharged deduster 18-1, desulfuration chimney 18-2 according to It is secondary to be connected；Power generator 16 is connect with waste heat boiler 15；Circulating flue gas section flue 19 is connect with the entrance of sintering machine 1.
Embodiment
With certain steel 210m2For sintering machine, totally 27 bellows, flue gas concentration are shown in Table 1.
1 flue gas concentration table of table
2 flue gas of 1-16 sintering bellows is mixed into denitration section flue 3,2 flue gas of 17-21 sintering bellows be mixed into it is de- Sulphur section flue 4,2 flue gas of 22-27 sintering bellows are mixed into circulating flue gas section flue 19,3 exhaust gas volumn 17.7 ten thousand of denitration section flue Nm3/ h, 78 DEG C of temperature, SO2Concentration 83mg/Nm3, NOxConcentration 183mg/Nm3；Desulfurization section flue 4 and circulating flue gas section flue 19 14.9 ten thousand Nm of exhaust gas volumn3/ h, 260 DEG C of temperature, SO2Concentration 727mg/Nm3, NOxConcentration 25mg/Nm3。
The flue gas of denitration section flue 3 and sinter are exchanged heat through shaft cooler 7, the desulfidation tail gas temperature after heat exchange exists 350 DEG C or more, the requirement for making dust contained flue gas concentration reach selective-catalytic-reduction denitrified is dusted by electric precipitator；
It sets inside and is passed through ammonia steam in the denitrification apparatus 9 of catalyst and carries out reduction denitration, NO in flue gasxExtrusion rate is 85% More than, selective-catalytic-reduction denitrified reaction equation is as follows:
Above-mentioned two reaction is exothermic reaction, but NO in flue gasxContent is lower, therefore the flue gas after denitrification apparatus 9 Variation is little before and after temperature；
Flue gas is directly accessed existing high-temperature flue gas boiler and carries out the heat exchange acquisition high-temperature steam direct generation of electricity or be incorporated to after denitration Enterprise's internal steam pipe net uses.
The flue gas utilization waste heat boiler 15 of desulfurization section flue 4 is generated electricity, flue-gas temperature is down to 120 DEG C after power generation, using There is desulphurization plant desulfurization.
In conclusion the embodiment of the invention provides a kind of agglomeration for iron mine waste heats to recycle collaboration emission reduction SOxAnd NOxMethod, this The process of invention sufficiently recycles sinter and sintering flue gas waste heat, while reducing SOxAnd NOxDischarge has process short, fits Strong with property, investment, the advantages such as operating cost is low have very big application value.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.

Claims (8)

1. a kind of agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxMethod, which is characterized in that agglomeration for iron mine waste heat recycling association With emission reduction SOxAnd NOxMethod includes: the high NO of low temperaturexLow SOxFlue gas and sinter heat exchange and the high SO of denitrating technique, high temperaturexLow NOx Off-gas recovery heat and the low SO of sulfur removal technology, high temperaturexLow NOxFlue gas recirculation technique；
The agglomeration for iron mine waste heat recycling collaboration emission reduction SOxAnd NOxThe device systems that method uses include: sintering machine (1), sintering Bellows (2), denitration section flue (3), desulfurization section flue (4), electrostatic precipitator (5), denitration air-introduced machine (6), shaft cooler (7), deduster (11-1), denitration cigarette before gravitational precipitator (8), denitrification apparatus (9), device for generating power by waste heat (10), denitration are discharged Chimney (11-2), crusher (12), hot precipitator (13), desulfurization air-introduced machine (14), waste heat boiler (15), power generator (16), Deduster (18-1), desulfuration chimney (18-2), circulating flue gas section flue (19) before desulfurizer (17), desulfurization are discharged；
It is arranged in sequence at least ten sintering bellows (2) from entrance to the outlet of the sintering machine (1), by the sintering machine (1) Entrance starts, successively are as follows: denitration section flue (3), desulfurization section flue (4), circulating flue gas section flue (19)；The denitration section flue (3) include quantity be total quantity 60% sintering bellows (2)；The desulfurization section flue (4) includes that quantity is total quantity 20% It is sintered bellows (2)；Circulating flue gas section flue (19) includes remaining sintering bellows (2)；
In the outlet of the sintering machine (1), sinter passes through after the sintering machine (1) is sintered for crusher (12) setting After the crusher (12) is broken, falls into the shaft cooler (7) and cooled down；
The denitration section flue (3), electrostatic precipitator (5), denitration air-introduced machine (6), shaft cooler (7), gravitational precipitator (8), preceding deduster (11-1), denitration chimney (11-2) successively phase are discharged in denitrification apparatus (9), device for generating power by waste heat (10), denitration Even；The desulfurization section flue (4), hot precipitator (13), desulfurization air-introduced machine (14), waste heat boiler (15), desulfurizer (17), Deduster (18-1), desulfuration chimney (18-2) are sequentially connected before desulfurization is discharged；The power generator (16) and waste heat boiler (15) Connection；The circulating flue gas section flue (19) connect with the entrance of sintering machine (1).
2. agglomeration for iron mine waste heat recycling collaboration emission reduction SO according to claim 1xAnd NOxMethod, which is characterized in that described The high NO of low temperaturexLow SOxFlue gas and sinter heat exchange and denitrating technique specifically:
The high NO of low temperaturexLow SOxFlue gas by denitration air-introduced machine (6), introduce denitration section flue (3), start and sinter heat exchange Process, the high NO of low temperaturexLow SOxFlue gas be dusted by electrostatic precipitator (5), into shaft cooler (7), after broken Sinter exchange heat to temperature be higher than 350 DEG C；
Flue gas after heat exchange carries out denitration, denitration by denitrification apparatus (9) after dedusting by gravitational precipitator (8) dedusting again Flue gas afterwards is generated electricity by device for generating power by waste heat (10), before residual gas is discharged by denitration after deduster (11-1) dedusting It is discharged through denitration chimney (11-2).
3. agglomeration for iron mine waste heat recycling collaboration emission reduction SO according to claim 2xAnd NOxMethod, which is characterized in that described The high NO of low temperaturexLow SOxFlue gas: 70-100 DEG C of temperature, SOxConcentration 50-150mg/m3, NOxConcentration 100-300mg/m3；
The denitrification apparatus (9) uses selective-catalytic-reduction denitrified principle；Catalyst uses V2O5-WO3/TiO2、V2O5-MoO3/ TiO2、V2O5/TiO2；Reducing agent uses ammonia vapor, and the ammonia for being greater than or equal to dust-removal and desulfurizing exhaust temperature is obtained by evaporator Water vapour.
4. agglomeration for iron mine waste heat recycling collaboration emission reduction SO according to claim 1xAnd NOxMethod, which is characterized in that described The high SO of high temperaturexLow NOxOff-gas recovery heat and sulfur removal technology specifically:
The high SO of high temperaturexLow NOxFlue gas by desulfurization air-introduced machine (14), introduce desulfurization section flue (4), start the mistake for recycling heat Journey, the high SO of high temperaturexLow NOxFlue gas be dusted by hot precipitator (13), into waste heat boiler (15), and pass through power generation Device (16), which generates electricity, drops to 150 DEG C hereinafter, the low-temperature flue gas after power generation is carried out by desulfurizer (17) to flue-gas temperature Desulfurization is discharged after deduster (18-1) dedusting through desulfuration chimney (18-2) before then being discharged by desulfurization.
5. agglomeration for iron mine waste heat recycling collaboration emission reduction SO according to claim 4xAnd NOxMethod, which is characterized in that described The high SO of high temperaturexLow NOxFlue gas: 200-300 DEG C of temperature, SOxConcentration 300-1500mg/m3, NOxConcentration 20-100mg/m3；
The desulfurizer (17) carries out desulfurization using dry method or semidry method or wet process.
6. agglomeration for iron mine waste heat recycling collaboration emission reduction SO according to claim 1xAnd NOxMethod, which is characterized in that described The low SO of high temperaturexLow NOxFlue gas recirculation technique specifically:
The low SO of high temperaturexLow NOxFlue gas by being passed into the entrance of sintering machine (1) again after circulating flue gas section flue (19), then The primary Ore Sintering Process participated in sintering machine (1).
7. agglomeration for iron mine waste heat recycling collaboration emission reduction SO according to claim 6xAnd NOxMethod, which is characterized in that described The low SO of high temperaturexLow NOxFlue gas: 400-500 DEG C of temperature, SOxConcentration 100-200mg/m3, NOxConcentration 20-100mg/m3。
8. a kind of realize any agglomeration for iron mine waste heat recycling collaboration emission reduction SO of claim 1 to 7xAnd NOxThe iron ore of method Sintering waste heat recycling collaboration emission reduction SOxAnd NOxDevice systems, which is characterized in that the device systems include: sintering machine (1), burn Tie bellows (2), denitration section flue (3), desulfurization section flue (4), electrostatic precipitator (5), denitration air-introduced machine (6), shaft cooler (7), deduster (11-1), denitration cigarette before gravitational precipitator (8), denitrification apparatus (9), device for generating power by waste heat (10), denitration are discharged Chimney (11-2), crusher (12), hot precipitator (13), desulfurization air-introduced machine (14), waste heat boiler (15), power generator (16), Deduster (18-1), desulfuration chimney (18-2), circulating flue gas section flue (19) before desulfurizer (17), desulfurization are discharged；
It is arranged in sequence at least ten sintering bellows (2) from entrance to the outlet of the sintering machine (1), by the sintering machine (1) Entrance starts, successively are as follows: denitration section flue (3), desulfurization section flue (4), circulating flue gas section flue (19)；The denitration section flue (3) include quantity be total quantity 60% sintering bellows (2)；The desulfurization section flue (4) includes that quantity is total quantity 20% It is sintered bellows (2)；Circulating flue gas section flue (19) includes remaining sintering bellows (2)；
In the outlet of the sintering machine (1), sinter passes through after the sintering machine (1) is sintered for crusher (12) setting After the crusher (12) is broken, falls into the shaft cooler (7) and cooled down；
The denitration section flue (3), electrostatic precipitator (5), denitration air-introduced machine (6), shaft cooler (7), gravitational precipitator (8), preceding deduster (11-1), denitration chimney (11-2) successively phase are discharged in denitrification apparatus (9), device for generating power by waste heat (10), denitration Even；The desulfurization section flue (4), hot precipitator (13), desulfurization air-introduced machine (14), waste heat boiler (15), desulfurizer (17), Deduster (18-1), desulfuration chimney (18-2) are sequentially connected before desulfurization is discharged；The power generator (16) and waste heat boiler (15) Connection；The circulating flue gas section flue (19) connect with the entrance of sintering machine (1).
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