CN107694335A - A kind of metallurgical gas purifying treatment method - Google Patents
A kind of metallurgical gas purifying treatment method Download PDFInfo
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- CN107694335A CN107694335A CN201711172648.7A CN201711172648A CN107694335A CN 107694335 A CN107694335 A CN 107694335A CN 201711172648 A CN201711172648 A CN 201711172648A CN 107694335 A CN107694335 A CN 107694335A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
Abstract
The present invention provides a kind of metallurgical gas purifying treatment method, and methods described is that pending flue gas is introduced into the process units of Ultramicro-powder slag to carry out desulfurization and partial denitrification, and flue gas then is introduced into denitrification apparatus carries out depth denitration process, finally realizes qualified discharge.The flue gas cleaning treatment method route of the present invention is simple, facilitate feasible, production procedure and smoke gas treatment are closely combined together, realize the purified treatment of flue gas and produce while carry out, low input, the gas cleaning processing procedure of high benefit are really realized, a kind of simple and convenient, high efficiency, the novel fume cleaning technique of high yield are provided for enterprise.
Description
Technical field
The invention belongs to field of metallurgy, is related to a kind of metallurgical gas purifying treatment method, more particularly to a kind of Ferrous Metallurgy
Integrated complex's flue gas cleaning treatment method.
Background technology
Ferrous Metallurgy integrated complex is a kind of aggregate of conglomerate, including dig up mine, smelt iron, making steel, intermetallic composite coating, refining
Jiao, coal chemical industry etc., various flue gas can be produced in enterprise production process, such as sinter flue gas, pelletizing flue gas, coke oven flue gas, arranging
Had to before putting by purified treatment.Purified treatment is usually desulphurization and denitration and dedusting, and existing handling process is a lot, into
Ripe desulfurization mainly has wet method (lime-gypsum method), semidry method (SDA methods), dry method (activated carbon method), ciculation fluidized bed process, takes off
Nitre is mainly Ozonation, SCR methods, activated carbon method.The construction cost of technique is that enterprise's selection process route will consider first
The problem of, which kind of processing mode no matter is selected, substantial amounts of financial resources will necessarily be expended.
Substantial amounts of slag can be produced during ore dressing or blast furnace ironmaking, often produces one ton of pig iron, about output 0.3-1.0 tons
Abandoned mine slag.Slag is caused waste residue in steelmaking process, and yield is about the 10~20% of crude steel yield.These big faces of waste residue amount
Extensively, main composition is CaO, MgO, SiO2、Al2O3, account for more than 95%, also FeO, MnO, TiO2、V2O5、P2O5, can Deng composition
Good recycling.Slag, which can refine, is processed as slag cements, slag micropowder, slag powders, portland slag cement, slag
Cotton etc..Slag can be applied to select slag steel, smelting flux, cement building material, agricultural fertilizer and acid soil improving agent etc..Micro mist slag (steel
Slag) prepare cement additire there is preferable economic benefit, amount of allocating is at least 40% in cement.Micro mist slag productive profit is about
50 yuan/ton, calculated with 600,000 tons/year of production lines, consume 400,000 tons of slags and 200,000 tons of slags every year, while can be full of and receive 30,000,000
Member, it is that one kind turns waste into wealth, the production technology of height recycling.
CN103846004A discloses a kind of acidic flue gas purifying treatment method, and it is that acidic flue gas is introduced into a purifying column
Inner chamber, the alkaline coolant that continuous circulated sprinkling goes out is collided into turbulent flow with acidic flue gas by the spray equipment that the inner chamber is set makes
It, which is cooled and carries out acid-base neutralization, forms wet flue gas and drop, the wet flue gas after cooling and drop is carried out at bubbling
Reason, the acid in acidic flue gas is dissolved in the liquid film of bubble surface, and with constantly circulation circulation alkalies fully contact into
Second of acid-base neutralization of row, wet flue gas enters air after dewater treatment heats up after purification, so as to realize the purification of acidic flue gas.
Gas cleaning, production and post processing are carried out but this method needs to use complex appts, and while production can not be realized
Cost it is high.
CN106268099A discloses a kind of flue gas purifying method, and methods described includes：(1) flue gas to be clean, which enters, adjusts
Wen Tahou, the temperature for regulating and controlling the flue gas to be clean are 60-200 DEG C, and (2) will enter by the flue gas of step (1) processing inhales
Tower is received, while the purification of cleanser crystal formation is sprayed into the absorption tower, and makes the penetrating direction of the cleanser and passes through step
(1) flow direction of the flue gas of processing is on the contrary, purification finishes the purification for completing the flue gas to be clean.But this method is same
The purification that flue gas is completed while production can not be realized, production and purification are separately carried out, and take and cost is high.
Therefore, it is the research emphasis of this area to handle flue gas to how simpler, efficient, high yield to turn waste into wealth.
The content of the invention
It is an object of the invention to provide a kind of metallurgical gas purifying treatment method, is especially to provide a kind of Ferrous Metallurgy connection
Close enterprise's flue gas cleaning treatment method.The method of the invention mutually ties the production technology of Ultramicro-powder slag with gas cleaning processing
Close, realize the purified treatment of flue gas and produce while carry out, there is the characteristics of simple and convenient, high efficiency, high yield.
To reach this goal of the invention, the present invention uses following technical scheme：
The present invention provides a kind of metallurgical gas purifying treatment method, and methods described is that pending flue gas is introduced into ultra micro fine ore
Desulfurization and partial denitrification are carried out in the process units of slag, flue gas then is introduced into denitrification apparatus carries out depth denitration process, finally
Realize qualified discharge.
In the present invention, the production technology of Ultramicro-powder slag and gas cleaning processing are combined, pending flue gas conduct
Micropowder mineral production in conveying gas, carried out desulphurization denitration process in process of production, the process route is simple, facilitate it is feasible,
Low input, the gas cleaning processing procedure of high benefit are really realized, is provided for integrated iron and steel works' gas cleaning processing
A kind of new purification process route.
Preferably, the process units of the Ultramicro-powder slag is vertical mill.
Preferably, flue-gas temperature is controlled at 200 DEG C -300 before pending flue gas to be introduced to the process units of Ultramicro-powder slag
DEG C, such as 200 DEG C, 210 DEG C, 220 DEG C, 230 DEG C, 240 DEG C, 250 DEG C, 260 DEG C, 270 DEG C, 280 DEG C, 290 DEG C or 300 DEG C, enter
One step is preferably 240 DEG C -280 DEG C.
Heat exchange process is carried out by selectivity to control the flue-gas temperature of introducing Ultramicro-powder slag in the present invention.
Preferably, pending flue gas is introduced into before the process units of Ultramicro-powder slag by using the waste heat reclaimed in production
Or flue-gas temperature is controlled 200 DEG C -300 DEG C using heat exchanger, to meet the process units of Ultramicro-powder slag (such as vertical mill)
Processing parameter requirement.
In the present invention, flue gas in cyclic process after vertical mill, the SO in flue gas2、NOxPurified, ultra micro
Desulfuration efficiency typically can reach more than 90% (such as 90%, 93%, 95%, 98% even more in the process units of fine ore slag
It is high), denitration efficiency is 40%-50% (such as 40%, 43%, 45%, 48% or 50%), and the present invention realizes the purification of flue gas
Processing and production are carried out simultaneously, are compared with other handling process, and input is less, can withdraw loss faster, be provided for enterprise
A kind of simple and convenient, high efficiency, the flue gas purifying technique of high yield.
Preferably, flue gas carries out dedusting using dust arrester after the process units processing of Ultramicro-powder slag to flue gas.
In the present invention, flue gas by the process units of Ultramicro-powder slag it is latter as desulfurization can be up to standard, carry out de- in next step
During nitre process, denitrification apparatus operational factor is according to the remaining NO of flue gasxContent regulates and controls, i.e., adjustment ammonia spraying amount makes residual in ammonia and flue gas
The NO stayedxMol ratio is 0.9-1.1:1 (such as 0.9:1、0.95:1、0.98:1、1:1、1.02:1、1.05:1、1.08:1 or
1.1:1), preferably 1, to ensure denitration efficiency.
Preferably, the denitrification apparatus is denitration island.
Preferably, the denitrification apparatus includes denitrating catalyst.
Preferably, the denitrating catalyst is activated carbon or low-temperature SCR catalyst.
Will flue gas introduce denitrification apparatus before make flue-gas temperature control 130-150 DEG C (such as 130 DEG C, 135 DEG C, 138 DEG C,
140 DEG C, 143 DEG C, 145 DEG C, 148 DEG C or 150 DEG C) or 200-250 DEG C (such as 200 DEG C, 210 DEG C, 220 DEG C, 230 DEG C, 240 DEG C
Or 250 DEG C).In the present invention, when denitrating catalyst is activated carbon, flue-gas temperature control is made before flue gas is introduced into denitrification apparatus
At 130-150 DEG C, when denitrating catalyst is low-temperature SCR catalyst, make flue-gas temperature control before flue gas is introduced into denitrification apparatus
At 200-250 DEG C.
In the present invention, the flue gas needs to meet requirement of the denitrification apparatus to flue-gas temperature before carrying out depth denitration, excellent
Selection of land, flue gas heat exchange or supplying high-temperature flue gas can be carried out by hot-blast stove, ensures that flue-gas temperature reaches catalyst in denitrification apparatus
Denitration optimum temperature.
Preferably, flue gas is introduced before denitrification apparatus and control the mode of flue-gas temperature to be changed using hot-blast stove flue gas
Heat or into flue gas directly be incorporated 350-550 DEG C (can for 350 DEG C, 355 DEG C, 360 DEG C, 380 DEG C, 400 DEG C, 430 DEG C, 450
DEG C, 480 DEG C, 500 DEG C, 530 DEG C or 550 DEG C) high-temperature flue gas.
Preferably, the method for denitration used in the denitrification apparatus is activated carbon method or low-temperature SCR method.
In the present invention, in order in the maintenance of Ultramicro-powder production process, stopping production, failure (i.e. process units stops production) or de-
The desulphurization and denitration processing of flue gas is carried out during the failure of nitre island, it is preferable that standby a set of desulfuring and denitrifying apparatus, in Ultramicro-powder slag
Process units maintenance, stop production, during failure or denitrification apparatus failure, it is complete that pending flue gas is introduced into the desulfuring and denitrifying apparatus
Into desulphurization denitration processing.
Preferably, the desulfuring and denitrifying apparatus is desulphurization denitration island.
Preferably, the desulfuring and denitrifying apparatus using activated carbon method or using SDA (rotary spraying and drying method) doctor treatments with
Low-temperature SCR (SCR) denitration method, which combines, carries out gas cleaning.
As the preferred technical solution of the present invention, the metallurgical gas purifying treatment method is：By pending flue-gas temperature
Control is then introduced into the process units of Ultramicro-powder slag progress desulfurization and partial denitrification at 200 DEG C -300 DEG C, then using removing
Dirt device carries out dedusting to flue gas, and flue gas finally is introduced into denitrification apparatus carries out depth denitration process, and flue gas is entering denitrification apparatus
It is preceding that flue gas is exchanged heat using hot-blast stove or is directly incorporated 350-550 DEG C of high-temperature flue gas so that flue-gas temperature control into flue gas
System finally realizes qualified discharge at 130-150 DEG C or 200-250 DEG C, standby a set of desulfuring and denitrifying apparatus in this method, in ultra micro
The process units maintenance of fine ore slag, stop production, during failure or denitrification apparatus failure, pending flue gas is introduced into the desulphurization denitration
Device completes desulphurization denitration processing.
In the present invention, the pending flue gas can be but be not limited to sinter flue gas, pelletizing flue gas, coke oven flue gas etc. and contain
A large amount of SO2、NOxWaste gas；Can be any one in sintering flue gas, pelletizing flue gas or coke oven flue gas or at least two group
Close.
Relative to prior art, the invention has the advantages that：
The present invention flue gas cleaning treatment method route it is simple, facilitate it is feasible, production procedure and smoke gas treatment is close
It is combined together, realizes the purified treatment of flue gas and produce while carry out, it is net really to realize low input, the flue gas of high benefit
Change processing procedure, a kind of simple and convenient, high efficiency, the novel fume cleaning technique of high yield are provided for enterprise.
Brief description of the drawings
Fig. 1 is the schematic device that the present invention used during gas cleaning processing, wherein 1., 2., 3. representing 3 differences
Flue gas landline.
Embodiment
Technical scheme is further illustrated below by embodiment.Those skilled in the art should be bright
, the embodiment be only to aid in understand the present invention, be not construed as to the present invention concrete restriction.
Preferred embodiment below provides a kind of Ferrous Metallurgy integrated complex flue gas purifying method, contains SO2、NOx, dust
Industrial smoke is conveyed enter in the vertical mill of Ultramicro-powder slag production technology by blower fan, and desulfurization is completed in the presence of Ultramicro-powder slag
Denitrification process, afterwards flue gas carrying out depth denitration, reduce the design pressure on denitration island below, obtain more preferable clean-up effect,
Final flue gas up to standard is through smoke stack emission.The a set of desulphurization denitration island of system reserve, to tackle, Ultramicro-powder slag is stopped production and denitration island is stopped
The situation of fortune.
Embodiment 1
In the present embodiment, the purified treatment of coke oven flue gas is carried out, method is as follows：
As shown in Figure 1 be the schematic device used during gas cleaning, original 200 DEG C of coke oven flue gas after waste heat recovery,
Flue-gas temperature is reduced to 250 DEG C, vertical mill is entered by a 1. number route, desulfurization and partial denitrification is completed in vertical mill, passes through
Deduster heel row goes out flue-gas temperature for 90 DEG C or so, and being increased to 130 DEG C using hot air furnace heat exchange temperature enters activated carbon denitrating tower,
Final purification flue gas is discharged by chimney.By being processed as above, the desulfuration efficiency of the flue gas is up to more than 90%, denitration efficiency
Up to more than 80%, meet qualified discharge standard.
Standby a set of active method system for desulfuration and denitration, when Vertical Mill machine overhauling or stopping production, changed by valve and lead to flue gas
Enter to 3. number route, flue gas and enter desulphurization denitration island, now flue-gas temperature is accordingly suitably adjusted by residual heat recovery process.When de-
Nitre tower failure is out of service and Ultramicro-powder slag produces and flue gas is switched into 2. number route when being normally carried out, into desulphurization denitration
Island, now flue-gas temperature accordingly suitably adjusted by hot-blast stove process.Complete process route is achieved in that, to tackle life
The various situations occurred in production.
Embodiment 2
In the present embodiment, the purified treatment of flue gas is sintered, method is as follows：
As shown in figure 1, former 400 DEG C of sintering flue gas is reduced to 260 DEG C after waste heat recovery, entered by a 1. number route vertical
Grinding machine, desulfurization and partial denitrification are completed in vertical mill, go out flue-gas temperature for 90 DEG C or so by deduster heel row, use hot-blast stove
Heat-exchange temperature is increased to 250 DEG C and enters low temperature SCR denitration tower, and final purification flue gas is discharged by chimney.By being processed as above, institute
The desulfuration efficiency for stating flue gas is up to more than 90%, and denitration efficiency is up to more than 80%, meets qualified discharge standard.
Vertical mill needs periodic inspection, same standby a set of system for desulfuration and denitration (SDA desulfurization and low temperature SCR denitration), when
When vertical mill is stopped transport, changed by valve and flue gas is passed into 3. number route, flue gas enters desulphurization denitration island, now flue-gas temperature phase
Should suitably it be adjusted by residual heat recovery process.Will when denitrating tower failure is out of service and the production of Ultramicro-powder slag is normally carried out
Flue gas is switched to 2. number route, and into desulphurization denitration island, now flue-gas temperature is accordingly suitably adjusted by hot-blast stove process.
Embodiment 3
1. number the route map with reference to shown in figure 1, enterprise's 240 DEG C~280 DEG C coke oven flue gas of original are without waste heat recovery, directly by
Route enters vertical mill, completes desulfurization and partial denitrification in vertical mill, it is 90 DEG C of left sides to go out flue-gas temperature by deduster heel row
The right side, hot-blast stove is used to be incorporated 500 DEG C or so flue gases so that temperature enters activated carbon denitrating tower, final purification after being increased to 130 DEG C
Flue gas is discharged by chimney.By being processed as above, the desulfuration efficiency of the flue gas is up to more than 90%, and denitration efficiency is up to 80%
More than, meet qualified discharge standard.
Standby a set of active method system for desulfuration and denitration, when Vertical Mill machine overhauling or stopping production, changed by valve and lead to flue gas
Enter to 3. number route, flue gas and enter desulphurization denitration island, now flue-gas temperature is accordingly suitably adjusted by residual heat recovery process.When de-
Nitre tower failure is out of service and Ultramicro-powder slag produces and flue gas is switched into 2. number route when being normally carried out, into desulphurization denitration
Island, now flue-gas temperature accordingly suitably adjusted by hot-blast stove process.Complete process route is achieved in that, to tackle life
The various situations occurred in production.
Embodiment 4
The route map with reference to shown in figure 1 is adjacent for coke oven flue collector, sintering flue gas flue collector, pelletizing flue gas flue collector
2 kinds or 3 kinds of flue gases can be mixed and administered by integrated complex, and flue-gas temperature is more than 240 DEG C after mixing, by waste heat recovery
Afterwards, vertical mill is entered via a 1. number route, desulfurization and partial denitrification is completed in vertical mill, by deduster heel row smoke temperature
Spend for 90 DEG C or so, use hot-blast stove to be directly incorporated 500 DEG C or so flue gases or indirect heat exchange so that temperature be increased to 130 DEG C it is laggard
Enter activated carbon denitrating tower, final purification flue gas is discharged by chimney.By being processed as above, the desulfuration efficiency of the flue gas is up to
More than 90%, denitration efficiency is up to more than 80%, meets qualified discharge standard.
Standby a set of active method system for desulfuration and denitration, when Vertical Mill machine overhauling or stopping production, changed by valve and lead to flue gas
Enter to 3. number route, flue gas and enter desulphurization denitration island, now flue-gas temperature is accordingly suitably adjusted by residual heat recovery process.When de-
Nitre tower failure is out of service and Ultramicro-powder slag produces and flue gas is switched into 2. number route when being normally carried out, into desulphurization denitration
Island, now flue-gas temperature accordingly suitably adjusted by hot-blast stove process.Complete process route is achieved in that, to tackle life
The various situations occurred in production.
A kind of Ferrous Metallurgy integrated complex gas cleaning handling process that the present embodiment provides, it is proposed that new gas cleaning
Process route, while purified treatment is carried out to flue gas, Ultramicro-powder slag is produced, the income of acquisition can make up construction desulfurization
The loss that island, denitration island are brought, whole process route is complete, fully combines enterprise practical situation, real realization low cost,
Efficient gas cleaning processing procedure, there is preferable development prospect.
The present invention illustrates the process of the present invention by above-described embodiment, but the invention is not limited in above-mentioned technique
Step, that is, do not mean that the present invention has to rely on above-mentioned processing step and could implemented.Person of ordinary skill in the field should
Understand, any improvement in the present invention, the addition of equivalence replacement and auxiliary element to raw material selected by the present invention, concrete mode
Selection etc., all fall within protection scope of the present invention and it is open within the scope of.
Claims (10)
1. a kind of metallurgical gas purifying treatment method, it is characterised in that methods described is：Pending flue gas is introduced into ultra micro fine ore
Desulfurization and partial denitrification are carried out in the process units of slag, flue gas then is introduced into denitrification apparatus carries out depth denitration process, finally
Realize qualified discharge.
2. according to the method for claim 1, it is characterised in that the process units of the Ultramicro-powder slag is vertical mill；
Preferably, flue-gas temperature is controlled to enter at 200 DEG C -300 DEG C before pending flue gas to be introduced to the process units of Ultramicro-powder slag
One step is preferably 240 DEG C -280 DEG C.
3. method according to claim 1 or 2, it is characterised in that pending flue gas is introduced to the production of Ultramicro-powder slag
Flue-gas temperature is controlled 200 DEG C -300 DEG C by using the waste heat reclaimed in production or using heat exchanger before device.
4. according to the method any one of claim 1-3, it is characterised in that flue gas fills by the production of Ultramicro-powder slag
Put and dedusting is carried out to flue gas using dust arrester after handling.
5. according to the method any one of claim 1-4, it is characterised in that flue gas is introduced into denitrification apparatus and carries out depth
During denitration process, the NO that the ammonia spraying amount of denitrification apparatus makes to remain in ammonia and flue gas is adjustedxMol ratio is 0.9-1.1:1；
Preferably, the denitrification apparatus is denitration island；
Preferably, the denitrification apparatus includes denitrating catalyst；
Preferably, the denitrating catalyst is activated carbon or low-temperature SCR catalyst.
6. according to the method any one of claim 1-5, it is characterised in that make flue gas before flue gas is introduced into denitrification apparatus
Temperature control is at 130-150 DEG C or 200-250 DEG C；
Preferably, by flue gas introduce denitrification apparatus before control flue-gas temperature mode be flue gas is exchanged heat using hot-blast stove or
Person is directly incorporated 350-550 DEG C of high-temperature flue gas into flue gas.
7. according to the method any one of claim 1-6, it is characterised in that the denitration side used in the denitrification apparatus
Method is activated carbon method or low-temperature SCR method.
8. according to the method any one of claim 1-7, it is characterised in that standby a set of desulphurization denitration in methods described
Device, during the process units maintenance of Ultramicro-powder slag, stopping production, failure or denitrification apparatus failure, pending flue gas is introduced
The desulfuring and denitrifying apparatus completes desulphurization denitration processing.
9. according to the method for claim 8, it is characterised in that the desulfuring and denitrifying apparatus is desulphurization denitration island；
Preferably, the desulfuring and denitrifying apparatus is combined using activated carbon method or with low temperature SCR denitration method progress using SDA doctor treatments
Gas cleaning；
Preferably, the pending flue gas is any one in sintering flue gas, pelletizing flue gas or coke oven flue gas or at least two
Combination.
10. according to the method any one of claim 1-9, it is characterised in that methods described is：By pending flue gas temperature
Degree control is then introduced into the process units of Ultramicro-powder slag at 200 DEG C -300 DEG C and carries out desulfurization and partial denitrification, then utilize
Dust arrester carries out dedusting to flue gas, and flue gas finally is introduced into denitrification apparatus carries out depth denitration process, and flue gas is entering denitration dress
Flue gas is exchanged heat or is directly incorporated 350-550 DEG C of high-temperature flue gas so that flue-gas temperature into flue gas using hot-blast stove before putting
Control finally realizes qualified discharge at 130-150 DEG C or 200-250 DEG C, standby a set of desulfuring and denitrifying apparatus in this method, super
The process units maintenance of micro mist slag, stop production, during failure or denitrification apparatus failure, pending flue gas is introduced into the desulfurization takes off
Nitre device completes desulphurization denitration processing.
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