CN107131770A - A kind of agglomeration for iron mine waste heat recovery collaboration emission reduction SOXAnd NOXMethod - Google Patents

A kind of agglomeration for iron mine waste heat recovery collaboration emission reduction SOXAnd NOXMethod Download PDF

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Publication number
CN107131770A
CN107131770A CN201710250343.7A CN201710250343A CN107131770A CN 107131770 A CN107131770 A CN 107131770A CN 201710250343 A CN201710250343 A CN 201710250343A CN 107131770 A CN107131770 A CN 107131770A
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sintering
denitration
low
flue gas
waste heat
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CN107131770B (en
Inventor
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 heat recovery collaboration emission reduction SOxAnd NOxMethod, is particularly suitable for use in the flue gas treating process of steel industry agglomeration for iron mine.As the enterprise's auxiliary construction for having sintering desulfuration technique ripe sintering flue gas desulfurization process can also may be selected newly-built together in this method.This method includes：The high NO of low temperaturexLow SOxFlue gas exchanges heat and the high SO of denitrating technique, high temperature with sintering depositxLow NOxOff-gas recovery heat and the low SO of sulfur removal technology, high temperaturexLow NOxFlue gas recirculation technique.The process of the present invention fully reclaims sintering deposit and sintering fume afterheat, while reducing SOxAnd NOxDischarge, strong applicability short with flow, investment, the low advantage of operating cost, with very big application value.

Description

A kind of agglomeration for iron mine waste heat recovery 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 recovery collaboration emission reduction SOx and NOx methods.
Background technology
Steel production in China is based on the long flow of blast furnace-converter, and sintering deposit accounts for the 70%~75% of blast furnace burden, sintering Process SO2Discharge and NOxDischarge accounts for the 60% and 50% of steel flow, is the main source of atmospheric pollution.Sintering flue gas takes off at present Sulphur is technically ripe, and method also has a variety of, and the country builds up the sintering desulfuration facility that puts into operation and there are about 1300 sets.And in sintering Made little progress in terms of the construction of denitrating flue gas, the sintering denitrification apparatus that China has been reported that is less than 10, wherein generally acknowledging removal effect Relatively good active charcoal method, activated carbon technology can remove SO simultaneouslyx、NOxAnd bioxin and other unwanted volatiles, but The investment of the technique is big, operating cost is high, it is difficult to popularize.Other are in the SCR methods of power industry maturation application, SNCR method denitration skills Art is because the temperature for sintering tail gas is low and can not realize, if the energy that temperature needed for tail gas heating to catalytic reaction is consumed is huge Greatly, it will also result in operating cost high.
In terms of sintering process UTILIZATION OF VESIDUAL HEAT IN, one side sintering circuit energy consumption is only second to blast furnace ironmaking, accounts for iron and steel enterprise The 11% of total energy consumption, the UTILIZATION OF VESIDUAL HEAT IN ratio of another aspect sintering circuit is very low, and only 6%, sintering deposit per ton there are about 0.9GJ Heat energy do not utilize.Mainly have on Land use systems and carry out hot gas sintering, igniting combustion supporting, pre- thermal sintering using sintering deposit waste heat Ore deposit and cogeneration.Reduction sintering air leak rate of air curtain, improves sintering mine sensible heat utilization ratio, and the sensible heat having in itself using sintering deposit is made The temperature eat source for needed for heat-agglomerating desulfidation tail gas to selective-catalytic-reduction denitrified (SCR) reaction, the angle originated from energy There are enough guarantees.
The content 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 recovery collaboration emission reduction SOxAnd NOxMethod, To solve the problem of existing capacity usage ratio is low, vent gas treatment cost is higher.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxMethod, agglomeration for iron mine waste heat recovery collaboration emission reduction SOx And NOxMethod includes：The high NO of low temperaturexLow SOxFlue gas exchanges heat and the high SO of denitrating technique, high temperature with sintering depositxLow 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 recovery collaboration emission reduction SOxAnd NOxThe device systems that method is used include：Sintering machine, sintering wind Case, denitration section flue, desulfurization section flue, electrostatic precipitator, denitration air-introduced machine, shaft cooler, gravitational precipitator, denitration dress Put, device for generating power by waste heat, denitration discharge before deduster, denitration chimney, disintegrating machine, hot precipitator, desulfurization air-introduced machine, waste heat pot Deduster, desulfuration chimney, circulating flue gas section flue before stove, TRT, desulfurizer, desulfurization discharge；
At least ten sintering bellows are arranged in sequence with from the entrance of sintering machine to outlet, by sintering machine entrance, successively For：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；
Disintegrating machine is arranged on after the outlet of sintering machine, the sintered machine burning knot of sintering deposit, after crusher in crushing, is fallen into perpendicular 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 TRT, denitration discharge；Desulfurization section flue, hot precipitator, desulfurization air-introduced machine, Deduster, desulfuration chimney are sequentially connected before waste heat boiler, desulfurizer, desulfurization discharge；TRT is connected with waste heat boiler；Follow The entrance of ring flue gas section flue and sintering machine is connected.
The high NO of low temperaturexLow SOxFlue gas is exchanged heat with sintering deposit and denitrating technique is specially：
The high NO of low temperaturexLow SOxFlue gas pass through denitration air-introduced machine, introduce denitration section flue, start with sintering deposit exchange heat mistake Journey, the high NO of low temperaturexLow SOxFlue gas dedusting is carried out by electrostatic precipitator, into shaft cooler, with it is broken after sintering deposit Exchanged heat to temperature and be higher than 350 DEG C；
Flue gas after heat exchange carries out denitration, after denitration after dedusting by gravitational precipitator dedusting again by denitrification apparatus Flue gas generated electricity by device for generating power by waste heat, arranged before residual gas is discharged by denitration after deduster dedusting through denitration chimney Put.
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 are specially：
The high SO of high temperaturexLow NOxFlue gas by desulfurization air-introduced machine, introduce desulfurization section flue, start to reclaim the process of heat, The high SO of high temperaturexLow NOxFlue gas by hot precipitator carry out dedusting, generated electricity into waste heat boiler, and by TRT Less than 150 DEG C are dropped to flue-gas temperature, the low-temperature flue gas after generating carries out desulfurization by desulfurizer, is then discharged by desulfurization 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 method.
The low SO of high temperaturexLow NOxFlue gas recirculation technique is specially：
The low SO of high temperaturexLow NOxFlue gas by circulating flue gas section flue after, the entrance of sintering machine is passed into again, again 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。
One kind realizes agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxThe agglomeration for iron mine waste heat recovery collaboration of method subtracts Arrange SOxAnd NOxDevice systems, it is characterised 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, disintegrating machine, hot precipitator, desulfurization air-introduced machine, waste heat boiler, TRT, desulfurization dress before discharge Put, preceding deduster is discharged in desulfurization, desulfuration chimney, circulating flue gas section flue；
At least ten sintering bellows are arranged in sequence with from the entrance of sintering machine to outlet, by sintering machine entrance, successively For：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；
Disintegrating machine is arranged on after the outlet of sintering machine, the sintered machine burning knot of sintering deposit, after crusher in crushing, is fallen into perpendicular 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 TRT, denitration discharge；Desulfurization section flue, hot precipitator, desulfurization air-introduced machine, Deduster, desulfuration chimney are sequentially connected before waste heat boiler, desulfurizer, desulfurization discharge；TRT is connected with waste heat boiler；Follow The entrance of ring flue gas section flue and sintering machine is connected.
The present invention has the beneficial effect that：
1st, the present invention takes full advantage of the sensible heat resource of sintering deposit, and the mesh that operating cost realizes economic denitration is greatly lowered 's；
2nd, process strong applicability of the invention, can be directed to different sintering machine device configurations, both can be used for built Also desulfuring and denitrifying apparatus can be built into sintering desulfuration enterprise simultaneously in newly-built enterprise；It is not only suitable for central cooler and straight line cooler The sintering deposit type of cooling, is also applied for the Novel vertical pot type sintering deposit type of cooling；
3rd, present invention waste heat from tail gas resource after denitration makes 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 be illustrated in the following description, and become aobvious and easy from specification See, or understood by implementing the present invention.The purpose of the present invention and other advantages can be by wanting in the specification, right write Structure specifically noted in book and accompanying drawing is asked to realize and obtain.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing In, identical reference symbol represents identical part.
Fig. 1 is a kind of agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxThe apparatus and process flow chart of method.
In figure：1- sintering machines, 2- sintering bellows, 3- denitrations section flue, 4- desulfurization sections flue, 5- electrostatic precipitator, 6- take off Before nitre air-introduced machine, 7- shaft coolers, 8- gravitational precipitators, 9- denitrification apparatus, 10- device for generating power by waste heat, 11-1- denitrations discharge Deduster, 11-2- denitrations chimney, 12- disintegrating machines, 13- hot precipitators, 14- desulfurization air-introduced machine, 15- waste heat boilers, 16- hairs Deduster, 18-2- desulfuration chimneys, 19- circulating flue gas section flue before electric installation, 17- desulfurizers, 18-1- desulfurization discharge.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and It is used for the principle for explaining the present invention together with embodiments of the present invention.
As shown in figure 1, the direction of arrow is pallet traffic direction in figure.A kind of agglomeration for iron mine waste heat recovery cooperates with emission reduction SOxAnd NOxMethod, agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxMethod includes：The high NO of low temperaturexLow SOxFlue gas is with burning Tie ore deposit 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 recovery collaboration emission reduction SOxAnd NOxThe device systems that method is used 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, disintegrating machine 12, high-temperature dust removal before denitrification apparatus 9, device for generating power by waste heat 10, denitration discharge Deduster 18-1, desulfurization before device 13, desulfurization air-introduced machine 14, waste heat boiler 15, TRT 16, desulfurizer 17, desulfurization discharge Chimney 18-2, circulating flue gas section flue 19；
At least ten sintering bellows 2 are arranged in sequence with from the entrance of sintering machine 1 to outlet, by the entrance of sintering machine 1, according to It is secondary to be：Denitration section flue 3, desulfurization section flue 4, circulating flue gas section flue 19；It is total quantity 60% that denitration section flue 3, which includes quantity, Sintering bellows 2；Desulfurization section flue 4 includes the sintering bellows 2 that quantity is total quantity 20%；Circulating flue gas section flue 19 includes remaining Under sintering bellows 2；When above ratio can not obtain integer, reduce result and round downwards；
Disintegrating machine 12 is arranged on the outlet of sintering machine 1, after the sintered machine 1 of sintering deposit is sintered, after being crushed by disintegrating machine 12, Fall into shaft cooler 7 and cooled down；
Denitration section flue 3, electrostatic precipitator 5, denitration air-introduced machine 6, shaft cooler 7, gravitational precipitator 8, denitrification apparatus 9th, deduster 11-1, denitration chimney 11-2 are sequentially connected before device for generating power by waste heat 10, denitration discharge；Desulfurization section flue 4, high temperature are removed Before dirt device 13, desulfurization air-introduced machine 14, waste heat boiler 15, desulfurizer 17, desulfurization discharge deduster 18-1, desulfuration chimney 18-2 according to It is secondary to be connected；TRT 16 is connected with waste heat boiler 15；Circulating flue gas section flue 19 is connected with the entrance of sintering machine 1.
The high NO of low temperaturexLow SOxFlue gas is exchanged heat with sintering deposit and denitrating technique is specially：
The high NO of low temperaturexLow SOxFlue gas pass through denitration air-introduced machine 6, introduce denitration section flue 3, start with sintering deposit exchange heat Process, the high NO of low temperaturexLow SOxFlue gas dedusting is carried out by electrostatic precipitator 5, into shaft cooler 7, with it is broken after burning Knot ore deposit, which is exchanged heat to temperature, is higher than 350 DEG C；
Heat transfer process can select suitable heat exchange mode according to the different sintering deposit type of cooling of sintering machine 1, it is possible to use Sintering deposit central cooler, 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, it is ensured that hot tail Gas dustiness is less than concentration needed for SCR (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 existing ripe SCR (SCR) Denitration pattern, also for sintering desulfuration tail gas NOxContent feature develops special-purpose catalyst；Flue gas after denitration passes through cogeneration Device 10 is generated electricity, and is discharged before residual gas is discharged by denitration after deduster 11-1 dedustings through denitration chimney 11-2；Denitration Flue gas also may be incorporated into the built high-temperature flue gas system of sintering exhaust-heat boiler 15 heating steam and be incorporated to steam pipe system or the direct generation of electricity afterwards, It can also be used for the hot gas sintering of sintering machine 1, 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 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 are specially：
The high SO of high temperaturexLow NOxFlue gas by desulfurization air-introduced machine 14, introduce desulfurization section flue 4, start to reclaim the mistake of heat Journey, the high SO of high temperaturexLow NOxFlue gas by hot precipitator 13 carry out dedusting, into waste heat boiler 15, and pass through TRT 16, which are generated electricity to flue-gas temperature, drops to less than 150 DEG C, and the low-temperature flue gas after generating carries out desulfurization by desulfurizer 17, then By being discharged after deduster 18-1 dedustings before desulfurization discharge through desulfuration chimney 18-2.
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 method.
The low SO of high temperaturexLow NOxFlue gas recirculation technique is specially：
The low SO of high temperaturexLow NOxFlue gas by circulating flue gas section flue 19 after, the entrance of sintering machine 1 is passed into again, then Once participate in the Ore Sintering Process 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。
One kind realizes agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxThe agglomeration for iron mine waste heat recovery collaboration of method subtracts Arrange SOxAnd NOxDevice systems, it is characterised 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, disintegrating machine 12, hot precipitator 13, desulfurization air-introduced machine before electric installation 10, denitration discharge 14th, deduster 18-1, desulfuration chimney 18-2, circulation cigarette before waste heat boiler 15, TRT 16, desulfurizer 17, desulfurization discharge Gas section flue 19；
At least ten sintering bellows 2 are arranged in sequence with from the entrance of sintering machine 1 to outlet, by the entrance of sintering machine 1, according to It is secondary to be：Denitration section flue 3, desulfurization section flue 4, circulating flue gas section flue 19；It is total quantity 60% that denitration section flue 3, which includes quantity, Sintering bellows 2；Desulfurization section flue 4 includes the sintering bellows 2 that quantity is total quantity 20%；Circulating flue gas section flue 19 includes remaining Under sintering bellows 2；
Disintegrating machine 12 is arranged on the outlet of sintering machine 1, after the sintered machine 1 of sintering deposit is sintered, after being crushed by disintegrating machine 12, Fall into shaft cooler 7 and cooled down；
Denitration section flue 3, electrostatic precipitator 5, denitration air-introduced machine 6, shaft cooler 7, gravitational precipitator 8, denitrification apparatus 9th, deduster 11-1, denitration chimney 11-2 are sequentially connected before device for generating power by waste heat 10, denitration discharge；Desulfurization section flue 4, high temperature are removed Before dirt device 13, desulfurization air-introduced machine 14, waste heat boiler 15, desulfurizer 17, desulfurization discharge deduster 18-1, desulfuration chimney 18-2 according to It is secondary to be connected；TRT 16 is connected with waste heat boiler 15；Circulating flue gas section flue 19 is connected with the entrance of sintering machine 1.
Embodiment
With certain steel 210m2Exemplified by sintering machine, totally 27 bellows, its flue gas concentration is shown in Table 1.
The flue gas concentration table of table 1
The flue gas of 1-16 sintering bellows 2 is mixed into denitration section flue 3, the flue gas of 17-21 sintering bellows 2 and is mixed into desulfurization Section flue 4, the flue gas of 22-27 sintering bellows 2 is mixed into circulating flue gas section flue 19, the denitration section exhaust gas volumn 17.7 ten thousand of flue 3 Nm3/ h, 78 DEG C of temperature, SO2Concentration 83mg/Nm3, NOxConcentration 183mg/Nm3；Desulfurization section flue 4 and circulating flue gas section flue 19 The Nm of exhaust gas volumn 14.9 ten thousand3/ h, 260 DEG C of temperature, SO2Concentration 727mg/Nm3, NOxConcentration 25mg/Nm3。
The flue gas of denitration section flue 3 is exchanged heat with sintering deposit through shaft cooler 7, the desulfidation tail gas temperature after heat exchange exists More than 350 DEG C, carrying out dedusting by electric cleaner makes dust contained flue gas concentration reach selective-catalytic-reduction denitrified requirement；
Set inside and NO in the progress reduction denitration of ammonia steam, flue gas is passed through in the denitrification apparatus 9 of catalystxExtrusion rate is 85% More than, selective-catalytic-reduction denitrified reaction equation is as follows：
Above-mentioned two reaction is NO in exothermic reaction, but flue gasxContent is relatively low, therefore the flue gas after denitrification apparatus 9 Change 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 is used.
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 generating, using There is desulphurization plant desulfurization.
In summary, the embodiments of the invention provide a kind of agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxMethod, this The process of invention fully reclaims sintering deposit and sintering fume afterheat, while reducing SOxAnd NOxDischarge, it is short with flow, fit It is strong with property, investment, the low advantage of operating cost, with very big application value.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, It should all be included within the scope of the present invention.

Claims (9)

1. a kind of agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxMethod, it is characterised in that the agglomeration for iron mine waste heat recovery is assisted With emission reduction SOxAnd NOxMethod includes：The high NO of low temperaturexLow SOxFlue gas exchanges heat and the high SO of denitrating technique, high temperature with sintering depositxLow NOx Off-gas recovery heat and the low SO of sulfur removal technology, high temperaturexLow NOxFlue gas recirculation technique.
2. agglomeration for iron mine waste heat recovery collaboration emission reduction SO according to claim 1xAnd NOxMethod, it is characterised in that described Agglomeration for iron mine waste heat recovery collaboration emission reduction SOxAnd NOxThe device systems that method is used 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), gravity are removed Dirt device (8), denitrification apparatus (9), device for generating power by waste heat (10), denitration are discharged preceding deduster (11-1), denitration chimney (11-2), broken Broken machine (12), hot precipitator (13), desulfurization air-introduced machine (14), waste heat boiler (15), TRT (16), desulfurizer (17), deduster (18-1), desulfuration chimney (18-2), circulating flue gas section flue (19) before desulfurization discharge；
At least ten sintering bellows (2) are arranged in sequence with from entrance to the outlet of the sintering machine (1), by the sintering machine (1) Entrance starts, and is followed successively by：Denitration section flue (3), desulfurization section flue (4), circulating flue gas section flue (19)；The denitration section flue (3) the sintering bellows (2) that quantity is total quantity 60% are included；It is total quantity 20% that the desulfurization section flue (4), which includes quantity, Sinter bellows (2)；Circulating flue gas section flue (19) includes remaining sintering bellows (2)；
The disintegrating machine (12) is arranged on the outlet of the sintering machine (1), after sintering deposit is sintered through the sintering machine (1), passes through After the disintegrating machine (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) phase successively 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 discharge；The TRT (16) and waste heat boiler (15) Connection；The circulating flue gas section flue (19) is connected with the entrance of sintering machine (1).
3. agglomeration for iron mine waste heat recovery collaboration emission reduction SO according to claim 2xAnd NOxMethod, it is characterised in that described The high NO of low temperaturexLow SOxFlue gas is exchanged heat with sintering deposit and denitrating technique is specially：
The high NO of low temperaturexLow SOxFlue gas pass through denitration air-introduced machine (6), introduce denitration section flue (3), start with sintering deposit exchange heat Process, the high NO of low temperaturexLow SOxFlue gas dedusting is carried out by electrostatic precipitator (5), into shaft cooler (7), after broken Sintering deposit exchanged heat to temperature be higher than 350 DEG C；
Flue gas after heat exchange carries out denitration, denitration after dedusting by gravitational precipitator (8) dedusting again by denitrification apparatus (9) 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 Discharged through denitration chimney (11-2).
4. agglomeration for iron mine waste heat recovery collaboration emission reduction SO according to claim 3xAnd NOxMethod, it is characterised 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 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 exhaust temperature Ammonia vapor.
5. agglomeration for iron mine waste heat recovery collaboration emission reduction SO according to claim 2xAnd NOxMethod, it is characterised in that described The high SO of high temperaturexLow NOxOff-gas recovery heat and sulfur removal technology are specially：
The high SO of high temperaturexLow NOxFlue gas by desulfurization air-introduced machine (14), introduce desulfurization section flue (4), start to reclaim the mistake of heat Journey, the high SO of high temperaturexLow NOxFlue gas by hot precipitator (13) carry out dedusting, into waste heat boiler (15), and pass through generate electricity Device (16), which is generated electricity to flue-gas temperature, drops to less than 150 DEG C, and the low-temperature flue gas after generating is carried out by desulfurizer (17) Desulfurization, is discharged before then being discharged by desulfurization after deduster (18-1) dedusting through desulfuration chimney (18-2).
6. agglomeration for iron mine waste heat recovery collaboration emission reduction SO according to claim 5xAnd NOxMethod, it is characterised 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 method.
7. agglomeration for iron mine waste heat recovery collaboration emission reduction SO according to claim 2xAnd NOxMethod, it is characterised in that described The low SO of high temperaturexLow NOxFlue gas recirculation technique is specially：
The low SO of high temperaturexLow NOxFlue gas by circulating flue gas section flue (19) after, the entrance of sintering machine (1) is passed into again, then Once participate in the Ore Sintering Process in sintering machine (1).
8. agglomeration for iron mine waste heat recovery collaboration emission reduction SO according to claim 7xAnd NOxMethod, it is characterised 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。
9. a kind of realize any described agglomeration for iron mine waste heat recovery collaboration emission reduction SO of claim 1 to 8xAnd NOxThe iron ore of method Sintering waste heat reclaims collaboration emission reduction SOxAnd NOxDevice systems, it is characterised in that the device systems include：Sintering machine (1), burning 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 discharge Chimney (11-2), disintegrating machine (12), hot precipitator (13), desulfurization air-introduced machine (14), waste heat boiler (15), TRT (16), Deduster (18-1), desulfuration chimney (18-2), circulating flue gas section flue (19) before desulfurizer (17), desulfurization discharge；
At least ten sintering bellows (2) are arranged in sequence with from entrance to the outlet of the sintering machine (1), by the sintering machine (1) Entrance starts, and is followed successively by：Denitration section flue (3), desulfurization section flue (4), circulating flue gas section flue (19)；The denitration section flue (3) the sintering bellows (2) that quantity is total quantity 60% are included；It is total quantity 20% that the desulfurization section flue (4), which includes quantity, Sinter bellows (2)；Circulating flue gas section flue (19) includes remaining sintering bellows (2)；
The disintegrating machine (12) is arranged on the outlet of the sintering machine (1), after sintering deposit is sintered through the sintering machine (1), passes through After the disintegrating machine (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) phase successively 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 discharge；The TRT (16) and waste heat boiler (15) Connection；The circulating flue gas section flue (19) is connected with the entrance of sintering machine (1).
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