CN108870988A - A kind of sintering smoke purifying system and its purification method - Google Patents

A kind of sintering smoke purifying system and its purification method Download PDF

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Publication number
CN108870988A
CN108870988A CN201810331212.6A CN201810331212A CN108870988A CN 108870988 A CN108870988 A CN 108870988A CN 201810331212 A CN201810331212 A CN 201810331212A CN 108870988 A CN108870988 A CN 108870988A
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CN
China
Prior art keywords
burner
flue gas
sintering
gas
deduster
Prior art date
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Pending
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CN201810331212.6A
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Chinese (zh)
Inventor
郑伟佳
张缦
吕俊复
杨海瑞
岳光溪
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Tsinghua University
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Tsinghua University
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Priority to CN201810331212.6A priority Critical patent/CN108870988A/en
Publication of CN108870988A publication Critical patent/CN108870988A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004Systems for reclaiming waste heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00Heating of air supplied for combustion
    • F23L15/04Arrangements of recuperators
    • F23L15/045Arrangements of recuperators using intermediate heat-transfer fluids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/20Sulfur; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/30Halogen; Compounds thereof
    • F23J2215/301Dioxins; Furans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00Intercepting solids
    • F23J2217/10Intercepting solids by filters
    • F23J2217/101Baghouse type
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

A kind of sintering smoke purifying system, including the first deduster and the burner being sequentially connected, separator, evaporating heating surface, SCR device, economizer, air preheater, desulfurizing tower and the second deduster.SCR device can also be arranged between different evaporating heating surfaces.Flue connection is successively arranged between first deduster and air preheater and burner bottom;Burner front end is provided with charging gear.Burner top is equipped with cigarette wind channel and connect with separator;Cigarette wind channel is additionally provided with SNCR.Sintering flue gas as First air and fuel reaction, then passes through two-step desulfurization, two-stage denitration and further dust separation by heating after the first deduster dedusting and removing Bu Fen bioxin by preheater.The present invention realizes energy regenerating while purifying sintering flue gas, improves system economy using sintering flue gas as hypoxemia air distribution.

Description

A kind of sintering smoke purifying system and its purification method
Technical field
The present invention relates to a kind of sintering smoke purifying systems, belong to environmental technology field.
Background technique
Steel industry is the industry of highly energy-consuming high pollution, and sintering process is then the important sources of steel industry pollution, is burnt Tie the sulfur dioxide (SO that technical process generates2) discharge amount accounts for about the 40%~60% of iron and steel enterprise's annual emissions.China's steel Industry sintering flue gas complicated component, fluctuation is larger, has the characteristics that:First is that exhaust gas volumn is big, one ton of sinter generates flue gas For 4000~6000m3;Second is that sulfur dioxide concentration variation is greatly, range is in 400~5000mg/Nm3Between;Third is that temperature change Greatly, generally 80 DEG C to 180 DEG C;Fourth is that changes in flow rate is big, amplitude of variation is up to 40% or more;Fifth is that moisture content is big and unstable It is fixed, generally 10~13%;Sixth is that high oxygen content, generally 15~18%;Seventh is that containing there are many succession, except containing dioxy Outside change sulphur, dust, also containing heavy metal, dioxin, nitrogen oxides etc..These features all increase steel to a certain extent The difficulty that sintering gas flue gas sulfuric dioxide is administered.
According to Chinese Ministry of Environmental Protection's publication《Steel sintering, pelletizing industrial air pollution object discharge standard》(GB28662-2012), Newly-built enterprise is from October 1st, 2012 (existing enterprise was from January 1st, 2015), the major pollutants of sintering machine equipment generation Particulate matter 50mg/m is executed respectively3, sulfur dioxide 200mg/m3, nitrogen oxides 300mg/m3, fluoride 4.0mg/m3, bioxin 0.5ng-TEQ/m3Limitation standard.With the implementation of new environmental law, steel and iron industry pollutant emission standard is greatly tight, still Some Enterprises can't realize that stably reaching standard discharges comprehensively, and energy conservation and environmental protection facility needs further to be transformed.
The improvement of sintering flue gas include to the progress such as dust, sulfur dioxide, nitrogen oxides, fluoride and bioxin simultaneously It administers.In various smoke treating methods, active carbon adsorption is a kind of unique method that can remove each impurity in flue gas, Including SO2, nitrogen oxides, smoke particle, mercury, bioxin, furans, heavy metal, volatile matter organic matter and other micro members Element.But active carbon adsorption is lower for the removing ability of nitrogen oxides, NOXPractical removal efficiency less than 40%, and it is living Property charcoal adsorbent equipment construction investment and day-to-day operation higher cost.In addition, there are also simultaneous SO_2 and NO removal technologies, i.e., in removing flue gas Nitrogen oxides is removed while middle sulfur dioxide.But major part simultaneous SO_2 and NO removal technology also rests on laboratory research rank at present Section, it is difficult to the really purification applied to the large-scale industry flue gas of exhaust gas volumns up to a million.Therefore use to sintering flue gas pollutant by Item is administered, the mode of Discrete control is that sintering flue gas administers more reasonable choice direction.
Summary of the invention
The purpose of the present invention is to provide a kind of sintering smoke purifying system and purification methods, in removing sintering flue gas pollution While object, thermal energy is recycled.
The present invention is achieved through the following technical solutions:
A kind of sintering smoke purifying system, it is characterised in that:The system comprises first deduster and it is sequentially connected Burner, separator, evaporating heating surface, economizer, air preheater, desulfurizing tower and the second deduster;First deduster with Flue connection is successively arranged between the air preheater and the burner bottom;The burner front end be provided with to Expect device;The burner top is equipped with cigarette wind channel and connect with the separator;The separator bottom is equipped with feed back pipe It is connect with the burner, the exhanst gas outlet of the separator and the evaporating heating surface, economizer, air preheater, desulfurizing tower It is sequentially connected with the second deduster;Cigarette wind channel is additionally provided with SNCR (selective non-catalytic reduction) device, sprays into urea Or ammoniacal liquor removes nitrogen oxides.
In above-mentioned technical proposal, the burner selects recirculating fluidized bed.
In above-mentioned technical proposal, the burner is additionally provided with desulfurizing agent to entrance.
In above-mentioned technical proposal, the burner middle and upper part is provided with several overfiren air ports.
In above-mentioned technical proposal, the system also includes SCR (selective catalytic reduction) device, the SCR device setting Before the economizer.
In above-mentioned technical proposal, high temperature air preheater is provided between the evaporating heating surface and the economizer, for adding Sintering flue gas of the heat by air preheater preheating.
In above-mentioned technical proposal, first deduster selects cyclone dust collectors or electric precipitator or bag filter;Institute It states the second deduster and selects bag filter.
A kind of sintering gas purifying method, using a kind of above-mentioned sintering smoke purifying system, the method includes:
Sintering flue gas simultaneously while after removing unit Fen dioxin pollutant, passes through flue gas by the first deduster dedusting Pipeline sequentially enters air preheater and is preheated, and then enters burner as oxidant and fluidisation from burner bottom and is situated between Matter;
Fuel feeds burner from charging gear, and low oxygen combustion is carried out under the action of oxidant;
Desulfurizing agent feeds burner from charging gear, and desulfurization is carried out in furnace;
Burn production high-temperature dust-containing flue gas separator is entered by cigarette wind channel from burner before, first pass through SNCR and fill Denitration is set, the high-temperature dust-containing flue gas after denitration enters separator gas solid separation;
Grit under separator gas solid separation returns to burner by feed back pipe and burns away;High-temperature flue gas after separation It sequentially enters evaporating heating surface and economizer and device of working medium heat exchange generates steam, the flue gas to cool down after heat exchange passes sequentially through air preheater It exchanges heat with sintering flue gas and further cools down;
Further the flue gas after cooling enters desulfurizing tower and continues to remove the sulfur dioxide in flue gas;
Flue gas after scrubbing CO_2 enters the second deduster and carries out depth dedusting, is captured down in flying dust same When, flue gas Zhong bioxin is also removed, and purified flue gas passes through smoke stack emission.
In above-mentioned technical proposal, sintering flue gas enters high temperature air preheater after preheating by air preheater and further heats, then Enter burner as oxidant and fluidizing agent from burner bottom.
In above-mentioned technical proposal, after the sintering flue gas is preheated by air preheater, a part enters from burner bottom Burner enters burner as Secondary Air, so that fuel combustion is more from overfiren air port as First air, another part Sufficiently.
As an improvement technical solution, the sintering flue gas by air preheater and high temperature air preheater heating after, one Divide from burner bottom and enter burner as First air, another part enters burner as secondary from overfiren air port Wind, so that fuel combustion is more abundant.
In above-mentioned technical proposal, desulfurizing agent is added burner to entrance from desulfurizing agent and carries out desulfuration in furnace.
In above-mentioned technical proposal, the flue gas is introduced into SCR device and further removes nitrogen oxygen before entering economizer heat exchange Compound realizes depth denitration.
The present invention has the following advantages and beneficial effects:1. the integrated removing processing of sintering flue gas pollutant is realized, It can be with harmful substances such as stable denitrification, sulfur dioxide, bioxin;2. by using Combustion technology of circulating fluidized, The content of sulfur-containing oxide in discharge flue gas is further reduced, desulfuration efficiency is improved;3. solve wet desulphurization hydrochlorate with The problem of flue gas is escaped solves the problems, such as to contain water mist in discharge flue gas;4. the characteristics of utilizing sintering flue gas high oxygen content, group Circulating fluid bed reactor burning is knitted, is efficiently utilized oxygen-containing in sintering flue gas;5. using SNCR and SCR combined denitration Technique can effectively remove nitrogen oxides.
Detailed description of the invention
Fig. 1 is the sintering smoke purifying system schematic diagram of one of embodiment involved in the present invention.
In figure:The first deduster of 1-;2- charging gear;3- burner;4- separator;5-SNCR device;6- Evaporating heating surface;7-SCR device;8- air preheater;9- desulfurizing tower;The second deduster of 10-;11- air-introduced machine;12- desulfurization Agent is to entrance;13- overfiren air port;14- economizer;15- high temperature air preheater.
Specific embodiment
A specific embodiment of the invention and the course of work are further described with reference to the accompanying drawing.
The positional terms such as the upper, lower, left, right, front and rear in present specification be positional relationship based on the figure and It establishes.Attached drawing is different, then corresponding positional relationship is also possible to change therewith, therefore cannot be interpreted as with this to protection model The restriction enclosed.
As shown in Figure 1, a kind of sintering smoke purifying system, including the first deduster 1 and the burner being sequentially connected 3, separator 4, evaporating heating surface 6, economizer 14, air preheater 8, desulfurizing tower 9 and the second deduster 10.Sintering flue gas contains SO2、 NOX, dust, heavy metal He the pollutants such as bioxin, oxygen content is lower than the oxygen content in air.
Burner 3 selects recirculating fluidized bed.Burner 3 is additionally provided with desulfurizing agent to entrance 12.3 middle and upper part of burner It is provided with several overfiren air ports 13.3 front end of burner is provided with charging gear 2.3 top of burner is equipped with cigarette wind channel It is connect with separator 4;Cigarette wind channel is additionally provided with SNCR device 5.
Flue connection is successively arranged between first deduster 1 and air preheater 8 and 3 bottom of burner.4 bottom of separator Portion is equipped with feed back pipe and connect with burner 3, the exhanst gas outlet of separator 4 and evaporating heating surface 6, economizer 14, air preheater 8, Desulfurizing tower 9 and the second deduster 10 are sequentially connected.
System further includes SCR device 7, is front and back with heating surface flue-gas temperature height, evaporating heating surface 6 is located at economizer 14 Before.SCR device 7 is arranged before economizer 14.One of embodiment as shown in Figure 1, the setting of SCR device 7 are being steamed Send out heating surface 6 and economizer 14.Evaporating heating surface 6 includes at least one of high temperature superheater, low temperature superheater and evaporator. Since 7 preferable temperature region of SCR device is 400~420 DEG C, SCR device 7 can also be arranged between evaporating heating surface 6, such as high Between warm superheater and evaporator perhaps between evaporator and low temperature superheater or high temperature superheater and low temperature superheater it Between.
Evaporating heating surface 6, economizer 14, SCR device 7 and air preheater 8 are each provided in back-end ductwork, the flue gas of separator 4 Outlet is connected to back-end ductwork, and flue gas flows in back-end ductwork, with device of working medium or sintering flue gas wall-type heat exchange.Economizer 14 Including high-temperature economizer and low-level (stack-gas) economizer.The arrangement of evaporating heating surface 6, the setting of economizer 14 and its internal working medium is according to changing Heat is needed and is adjusted.As a kind of optimisation technique scheme, high temperature air preheater 15 is set between evaporating heating surface 6 and economizer 14, For further heating the sintering flue gas preheated by air preheater 8.High temperature air preheater 15 is arranged after SCR device 7, such as Fig. 1 It is shown.
First deduster 1 selects cyclone dust collectors or electric precipitator or bag filter;Second deduster 10 selects cloth bag Deduster.
A kind of sintering gas purifying method, the method includes:
Sintering flue gas simultaneously while after removing unit Fen dioxin pollutant, passes through cigarette by 1 dedusting of the first deduster Feed channel enters air preheater 8 and carries out wall-type heat exchange, and then sintering flue gas enters 3 conduct of burner from 3 bottom of burner Oxidant and fluidizing agent;
Fuel feeds burner 3 from charging gear 2, and low oxygen combustion is carried out under the action of oxidant;
Desulfurizing agent feeds burner 3 from charging gear 2, and desulfurization is carried out in furnace;
Burn production high-temperature dust-containing flue gas separator 4 is entered by cigarette wind channel from burner 3 before, first pass through SNCR Device 5 sprays into urea liquid or ammoniacal liquor denitration, the high-temperature dust-containing flue gas after denitration enter 4 gas solid separation of separator;
Grit under 4 gas solid separation of separator returns to burner 3 by feed back pipe and burns away;High temperature cigarette after separation Gas sequentially enters evaporating heating surface 6 and economizer 14 and device of working medium heat exchange generates steam, and the flue gas to cool down after heat exchange passes through empty pre- Device 8 and sintering flue gas heat exchange further cooling;
Further the flue gas after cooling is entered desulfurizing tower 9 and is continued to remove the sulfur dioxide in flue gas using semidry method;
Flue gas after scrubbing CO_2 enters the second deduster 10 and carries out depth dedusting, is captured down in flying dust same When, flue gas Zhong bioxin is also removed, and purified flue gas passes through smoke stack emission.
In the above method, after sintering flue gas is preheated by air preheater 8, a part enters burning dress from 3 bottom of burner 3 are set as First air, another part enters burner 3 from overfiren air port 13 and is used as Secondary Air, so that fuel combustion is more filled Point.
As a kind of technical solution of optimization, after sintering flue gas is successively heated by air preheater 8 and high temperature air preheater 15, one Part enters burner 3 as First air from 3 bottom of burner, and another part enters burner 3 from overfiren air port 13 As Secondary Air, so that fuel combustion is more abundant.
In the above method, desulfurizing agent can also be added burner 3 to entrance 12 from desulfurizing agent and carry out desulfuration in furnace.
Further to remove nitrogen oxides, flue gas is introduced into SCR device 7 and further takes off before entering economizer 14 and exchanging heat Nitre.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of sintering smoke purifying system, it is characterised in that:The system comprises the first deduster (1) and it is sequentially connected Burner (3), separator (4), evaporating heating surface (6), economizer (14), air preheater (8), desulfurizing tower (9) and the second dedusting Device (10);Flue is successively arranged between first deduster (1) and the air preheater (8) and burner (3) bottom Connection;Burner (3) front end is provided with charging gear (2);Burner (3) top is equipped with cigarette wind channel and institute State separator (4) connection;Separator (4) bottom is equipped with feed back pipe and connect with the burner (3), the separator (4) exhanst gas outlet and the evaporating heating surface (6), economizer (14), air preheater (8), desulfurizing tower (9) and the second deduster (10) it is sequentially connected;Cigarette wind channel is additionally provided with SNCR device.
2. a kind of sintering smoke purifying system according to claim 1, it is characterised in that:The burner (3) is selected Recirculating fluidized bed.
3. a kind of sintering smoke purifying system according to claim 1 or 2, it is characterised in that:The burner (3) is also Entrance (12) are given equipped with desulfurizing agent.
4. a kind of sintering smoke purifying system according to claim 1 or 2, it is characterised in that:In the burner (3) Top is provided with several overfiren air ports (13).
5. a kind of sintering smoke purifying system according to claim 1, it is characterised in that:The system also includes SCR dresses It sets (7), the SCR device (7) is arranged before the economizer (14).
6. a kind of sintering smoke purifying system according to claim 1, it is characterised in that:The evaporating heating surface (6) with High temperature air preheater (15) are provided between the economizer (14), for heating the sintering flue gas by air preheater (8) preheating.
7. a kind of sintering gas purifying method uses a kind of sintering smoke purifying system as described in claim 1, feature It is:The method includes
Sintering flue gas simultaneously while after removing unit Fen dioxin pollutant, passes through flue gas by the first deduster (1) dedusting Pipeline enters air preheater (8) and is preheated, and then enters burner (3) as oxidant and stream from burner (3) bottom Change medium;
Fuel feeds burner (3) from charging gear (2), and low oxygen combustion is carried out under the action of oxidant;
Desulfurizing agent feeds burner (3) from charging gear (2), and desulfurization is carried out in furnace;
Burn production high-temperature dust-containing flue gas separator (4) are entered by cigarette wind channel from burner (3) before, first pass through SNCR Device (5) denitration, the high-temperature dust-containing flue gas after denitration enter separator (4) gas solid separation;
Grit under separator (4) gas solid separation returns to burner (3) by feed back pipe and burns away;High temperature cigarette after separation Gas sequentially enters evaporating heating surface (6) and economizer (14) and working medium heat exchange generates steam, and the flue gas to cool down after heat exchange passes through sky Pre- device (8) and sintering flue gas heat exchange further cooling;
Further the flue gas after cooling enters desulfurizing tower (9) and continues to remove the sulfur dioxide in flue gas;
Flue gas after scrubbing CO_2 enters the second deduster (10) and carries out depth dedusting, is captured down in flying dust same When, flue gas Zhong bioxin is also removed, and purified flue gas passes through smoke stack emission.
8. a kind of sintering gas purifying method according to claim 7, it is characterised in that:The sintering flue gas passes through empty pre- After device (8) preheating, a part enters burner (3) as First air from burner (3) bottom, and another part is from Secondary Air Mouth (13) enters burner (3) and is used as Secondary Air, so that fuel combustion is more abundant.
9. a kind of sintering gas purifying method according to claim 7, it is characterised in that:Desulfurizing agent is from desulfurizing agent to entrance (12) burner (3) are added and carry out desulfuration in furnace.
10. a kind of sintering gas purifying method according to claim 7, it is characterised in that:The flue gas is entering province's coal Before device (14) heat exchange, it is introduced into SCR device (7) and further removes nitrogen oxides.
CN201810331212.6A 2018-04-13 2018-04-13 A kind of sintering smoke purifying system and its purification method Pending CN108870988A (en)

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