CN106984169A - The denitrating system and method for a kind of direct utilization sintering deposit heat - Google Patents
The denitrating system and method for a kind of direct utilization sintering deposit heat Download PDFInfo
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- CN106984169A CN106984169A CN201710369398.XA CN201710369398A CN106984169A CN 106984169 A CN106984169 A CN 106984169A CN 201710369398 A CN201710369398 A CN 201710369398A CN 106984169 A CN106984169 A CN 106984169A
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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
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- 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
-
- 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
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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
-
- 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
-
- 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
Abstract
The present invention provides the denitrating system and method for a kind of direct utilization sintering deposit heat, and the system includes sintering machine, cooling device, waste-heat recovery device, dry desulfurization device, dust arrester, blower fan, Benitration reactor and chimney；The exhanst gas outlet of sintering machine wind box is connected to the smoke inlet of first and second section of bellows, and the exhanst gas outlet of first and second section of bellows is connected with waste-heat recovery device, is then sequentially connected in series with dry desulfurization device, dust arrester, booster fan and chimney by pipeline；When Benitration reactor is low-temperature denitration reactor, it is arranged between blower fan and chimney；When Benitration reactor is middle temperature Benitration reactor, it is arranged between first and second section of bellows exhanst gas outlet and waste-heat recovery device.Present system and method directly utilize sintering deposit heat, sintering flue gas is carried out low-temperature denitration reaction, Efficient Conversion NO on the premise of indigestion additional energyx, denitration rate will not cause sintering deposit embrittlement up to 80~90%, moreover it is possible to reclaim sintering deposit waste heat.
Description
Technical field
The present invention relates to denitrating system and the side of denitrating system and method, more particularly to a kind of direct utilization sintering deposit heat
Method.
Background technology
With the development and the increasingly raising of living standards of the people of national economy, it is increasing that environmental problem obtains people
Pay attention to, and be used as the pollutant closely related with air quality, nitrogen oxides (NOx) it is constantly subjected to paying close attention to for country.Root
According to Chinese Ministry of Environmental Protection's statistics, national industrial gas emission NO in 2014x1404.8 ten thousand tons altogether, and ferrous metal smelting and calendering
Process the NO of dischargexIt is one of wherein three big emission sources.
The flue gas that sintering machine is discharged in iron and steel enterprise's (ferrous metal smelting) is emphasis NOxEmission source, its denitration is by more
Carry out more concerns.《Key area prevention and control of air pollution " 12 " is planned》Development nitrogen oxides pollution comprehensively is distinctly claimed to prevent
Control, actively develop sintering device flue gas denitration demonstration.The issue of in September, 2013《Prevention and control of air pollution action plan》Even more require to add
Fast key industry denitration transformation, with continuing badly in recent years many regional air qualities, it is believed that " the atmosphere pollution that will be promulgated
Prevent and treat 13 planning " it can also give and pay close attention to.
Sintering machine is the maximum NO of steel plantxEmission source, account for steel plant's discharge capacity 50%~60% (is free of and provides electricity for oneself
Factory), average emission concentration is generally in 200mg/Nm3~400mg/Nm3, also there is 150mg/Nm3~700mg/Nm3Situation, flue gas
Middle SO2Concentration is general in 1000~3000mg/Nm3, smog discharge temperature is generally 100 DEG C~180 DEG C, is generally difficult to meet
GB28662-2012《Steel sintering, pelletizing industrial air pollution thing discharge standard》.Improved in view of total amount emission reduction and standard
Situations such as, sintering machine NOxRemoving has been subjected to the concern of more and more owners.
Being presently available for sintering the technology of denitrating flue gas mainly has three kinds：The first is active carbon desulfurization denitration method, the party
Method integrated can remove various pollutants in fume, but equipment manufacturing cost is high, and operating cost is very high, and enterprise is difficult to bear；The
Two kinds are oxidizing process denitrations, and this method realizes denitration purpose, this method by oxidizing NO, and using existing wet desulphurization
Current still immature and its energy consumption is too high, denitration efficiency is than relatively low；The third is then the SCR (Selective for using for reference power industry
Catalytic Reduction) denitration to sintering flue gas carry out denitration, although power industry SCR denitration is highly developed, but
Because sulfur dioxide in sintering flue gas concentration is higher, temperature is low, NOxConcentration is low and carries a large amount of dusts, can without SCR catalyst
To be directly realized by the denitration of sintering device flue gas, although the temperature for sintering flue gas can be risen to 350~450 DEG C of progress SCR denitrations, with
The influence of sulfur dioxide is avoided, but which needs to consume a large amount of fuel, is catalyzed even with the low-temperature SCR reached its maturity now
Agent, sulfur dioxide is first first purified to very low concentrations, then rise to temperature within 200 DEG C, to carry out low-temperature denitration, but the party
The temperature that formula still needs significantly rise sintering flue gas can be only achieved low-temperature SCR catalyst reaction temperature, therefore, be urged using low temperature
Agent still needs to consume mass energy, can equally cause operating cost too high.
The A of CN 102997697 disclose a kind of sintering deposit UTILIZATION OF VESIDUAL HEAT IN technique based on sintering gas purifying, and the technique will
Flue gas after dedusting and the ammonia process of desulfurization, a part of (65~85%) and sintering deposit direct heat transfer heating, another part (15~
35%) heated up with final purification discharge flue gas indirect heat exchange, temperature reaches 380 DEG C after the flue gas mixing after two parts are heated up,
Conventional Medium temperature SCR reactor denitration is then fed into, the flue gas after denitration after aforementioned second part flue gas indirect heat exchange with discharging.Should
Wet flue gas after the ammonia process of desulfurization is sent directly into sintering deposit by technology, and wet-method desulfurized fume is wet saturated flue gas, and containing perhaps
Many aqueous waters, this flue gas is passed directly into heat sinter, it may occur that local drastically cooling causes sintering deposit fragmentation, influences sintering deposit
Quality；In addition, flue gas is sintered in the technology first passes through wet desulphurization cooling, then using sintering deposit heat lift flue-gas temperature,
In whole process so that original sintering deposit heat can not be recycled utilization, integrated artistic system capacity profit by waste heat recovery
With less efficient.
The A of CN 103463946 disclose a kind of sintering gas purifying method based on sintering deposit catalytic action, and the technique will
Sintering flue gas and sintering deposit direct heat transfer after dedusting, and selective catalytic reduction reaction is carried out under sintering deposit effect, spray into
Conversion of nitrogen oxides in flue gas into nitrogen, is reached the effect of denitration by ammonia, and flue gas progress waste heat recovery then is cooled into 100
~150 DEG C, then by smoke stack emission after the ammonia process of desulfurization.Because sintering deposit catalytic action is limited in the case, and because the escaping of ammonia
It can cause waste heat recovery rear end ammonium sulfate precipitation serious so as to which ammonia spraying amount must be controlled, relatively low denitration efficiency can only be realized；Base
In domestic sintering deposit waste heat recovery practice situation, a large amount of dusts can be carried by the flue gas after sintering deposit, after waste heat recovery
Still exist, the case directly by this flue gas send into the ammonia process of desulfurization, can strong influence wet desulfurization system solid balance and
Accessory substance is crystallized, and destruction system is run steadily in the long term；Cigarette temperature is in 50 DEG C or so, lifting ability, chimney after other wet desulphurization
High flooring concentration region is nearby easily formed, and big face is all formed when domestic wet-method desulfurized fume is discharged from chimney at present
Product plume, has become a problem of public attention.
Therefore, this area needs a kind of denitrating system of exploitation and method badly, can indigestion additional energy premise
Under, efficient process sintering flue gas, and sintering deposit embrittlement will not be caused and sintering deposit waste heat can be reclaimed.
The content of the invention
In view of reality needs, an object of the present invention is to provide a kind of denitration system of direct utilization sintering deposit heat
System and corresponding method, the denitrating system and corresponding method directly utilize sintering deposit heat, can be in indigestion additional energy
On the premise of make sintering flue gas carry out denitration reaction, Efficient Conversion NO thereinx, denitration rate, and will not up to 80~90%
Cause sintering deposit embrittlement, moreover it is possible to reclaim sintering deposit waste heat.
To achieve the above object, on the one hand, the present invention provides a kind of denitrating system of direct utilization sintering deposit heat, it is wrapped
Include sintering machine, sintering deposit cooling device, waste-heat recovery device, dry desulfurization device, dust arrester, Benitration reactor and chimney；
The sintering machine is provided with sintering machine wind box；
The sequencing being cooled along sintering deposit to be cooled in the sintering deposit cooling device, the sintering deposit cooling is set
It is standby to be provided with cooling device first paragraph bellows, the 3rd section of bellows of cooling device second segment bellows and cooling device, the sintering machine wind
The exhanst gas outlet of case is connected to the cigarette of the cooling device first paragraph bellows and the cooling device second segment bellows by pipeline
The exhanst gas outlet of gas entrance, the cooling device first paragraph bellows and the cooling device second segment bellows by pipeline with it is described
Waste-heat recovery device is connected, and the waste-heat recovery device, dry desulfurization device, dust arrester, booster fan and chimney pass through pipe
Road is sequentially connected in series；
When the Benitration reactor is low-temperature denitration reactor, it is arranged on the company between the booster fan and chimney
Take on road, the low-temperature denitration reactor refers to the reactor for carrying out low-temperature denitration reaction, low-temperature denitration reaction utilizes low
Warm SCR denitration is less than 240 DEG C of progress in temperature, such as in 150~240 DEG C of progress；
When the Benitration reactor is middle temperature Benitration reactor, it is arranged on the cooling device first paragraph bellows and institute
State on the connecting line between the exhanst gas outlet and the waste-heat recovery device of cooling device second segment bellows, the middle temperature denitration
Reactor refers to the reactor for carrying out middle temperature denitration reaction, and the middle temperature denitration reaction is using middling temperature DeNOx catalyst in temperature
More than 300 DEG C progress, such as in 350~420 DEG C of progress.
When Benitration reactor of the present invention uses low-temperature denitration reactor, the denitrating system is from cooling device first paragraph bellows
And the exhanst gas outlet of second segment bellows starts, waste-heat recovery device, dry desulfurization device, dedusting dress are sequentially connected by pipeline
Put, booster fan, low-temperature denitration reactor and chimney.
When Benitration reactor of the present invention is middle temperature Benitration reactor, the denitrating system from cooling device first paragraph bellows and
The exhanst gas outlet of second segment bellows starts, and middle temperature Benitration reactor, waste-heat recovery device, dry desulfurization are sequentially connected by pipeline
Device, dust arrester, booster fan and chimney.
Low-temperature denitration reactor of the present invention, middle temperature Benitration reactor are existing equipment, are used in these equipment
Low temperature SCR denitration catalyst, middling temperature DeNOx catalyst are also existing catalyst, and such as low temperature SCR denitration catalyst can be
Low form vanadium Ti-base catalyst, low temperature manganese-based catalyst etc., are applied to as disclosed in CN101658787A/CN101879452A etc.
The low temperature SCR denitration catalyst of the present invention.Middling temperature DeNOx catalyst can be vanadium Ti-base catalyst or other high temperature catalyst
Deng suitable for the middling temperature DeNOx catalyst of the present invention as disclosed in CN102764643A/CN104209116A etc..
Sintering deposit cooling device of the present invention is preferably central cooler.Central cooler is existing equipment, and it can be generally divided into
Three bellows, respectively high temperature section bellows, middle-temperature section bellows and low-temperature zone bellows, it is respectively equivalent to the foregoing cooling of the present invention and set
Standby first paragraph bellows, the 3rd section of bellows of cooling device second segment bellows and cooling device.Sintering deposit produces completion from sintering machine
Afterwards, it is the condition of high temperature, is placed on central cooler, central cooler is set provided with ring-type double-edged fine-toothed comb layer, its usual bottom along circumferential direction
Have several cooling blowers, double-edged fine-toothed comb upper segment be provided with cover, cry successively from front to back high temperature section bellows, middle-temperature section bellows and
Low-temperature zone bellows.
It is used as the embodiment of foregoing denitrating system of the invention, it is preferable that when using low-temperature denitration reactor, institute
State between cooling device first paragraph bellows and the exhanst gas outlet and the waste-heat recovery device of the cooling device second segment bellows
Connecting line on be additionally provided with blower fan；
When using middle temperature Benitration reactor, the cooling device first paragraph bellows and the cooling device second segment bellows
Exhanst gas outlet and the middle temperature Benitration reactor between connecting line be provided with blower fan.Further the purpose of blower fan is set to exist
In overcoming SR, flue gas feeding Benitration reactor is preferably subjected to denitration reaction.
It is used as the embodiment of the foregoing any denitrating system of the present invention, it is preferable that the head of the sintering machine is provided with
Or dust arrester is not provided with, such as with dust arrester, it is preferably electric dust collector, and the dust arrester is arranged on the sintering machine
On the connecting line of bellows and the cooling device first paragraph bellows and cooling device second segment bellows.Electric cleaner is set to be easy to
Safeguard.
Sintering machine head end of the present invention does not require that provided with dust arrester, newly-built sintering machine head dust removing device can be omitted, and be concentrated
It is uniformly processed to rear end sack cleaner, reduces system investments.In general, existing sintering machine head end is designed with dust arrester,
In this case, existing sintering machine head dust removing system need not be transformed, and directly can transform to form denitration of the present invention on its basis
System, therefore, denitrating system operation operating flexibility of the present invention are big.
It is used as the embodiment of the foregoing any denitrating system of the present invention, it is preferable that the dry desulfurization device is sodium
Base or calcium Ji Xuanzhuanpenwuta.The sodium Ji Xuanzhuanpenwuta refers to the rotating spraying tower for using sodium carbonate for desulfurizing agent, described
Calcium Ji Xuanzhuanpenwuta refers to the rotating spraying tower for using calcium oxide for desulfurizing agent.
It is used as the embodiment of the foregoing any denitrating system of the present invention, it is preferable that described dust arrester is selected from cloth
Bag dust collector or electric cleaner, preferably sack cleaner.Lower outlet powder can be obtained when using sack cleaner
Dust concentration.
The annexation between part and these parts included by the above-mentioned denitrating system of the present invention, which ensure that to utilize, is somebody's turn to do
The method of denitrating system can directly utilize sintering deposit heat, be taken off sintering flue gas on the premise of indigestion additional energy
Nitre reacts, Efficient Conversion NO thereinx, and sintering deposit embrittlement will not be caused and sintering deposit waste heat can be reclaimed.
On the other hand, the present invention provides a kind of method of denitration of direct utilization sintering deposit heat, wherein, method of denitration profit
With above-mentioned denitrating system, the method for denitration include the flue gas that produces sintering machine after sintering machine wind box removing dust or without except
It is introduced to after dirt in the cooling device first paragraph bellows and cooling device second segment bellows, makes it wrong with sintering deposit to be cooled
Direct heat transfer is flowed, the flue gas after direct heat transfer is received from the cooling device first paragraph bellows and cooling device second segment bellows
Collection, then in turn through the waste-heat recovery device, dry desulfurization device, dust arrester, booster fan, low-temperature denitration reactor
And discharge (when Benitration reactor uses low-temperature denitration reactor) after chimney, or
Sequentially pass through the middle temperature Benitration reactor, waste-heat recovery device, dry desulfurization device, dust arrester, supercharging wind
Discharge after machine and chimney (when Benitration reactor uses middle temperature Benitration reactor).
The present invention makes sintering flue gas and sintering deposit cross-flow direct heat transfer to be cooled generally refer to when sintering deposit is moved horizontally,
Flue gas directs contact with exchanged heat from the bottom up.
It is used as the embodiment of foregoing method of denitration of the invention, it is preferable that from the cooling device first paragraph bellows
And the flue gas that is collected of cooling device second segment bellows directly by the waste-heat recovery device reclaim a heat and without
Circulation and stress heat.
It is used as the embodiment of foregoing method of denitration of the invention, it is preferable that SO in the flue gas that the sintering machine is produced2
Concentration be not more than 3000mg/Nm3, NOxConcentration is not more than 1000mg/Nm3, dustiness is not more than 10g/Nm3, its temperature is 80
~180 DEG C.Especially, method of denitration of the present invention NO suitable for flue gasxConcentration is not more than 500mg/Nm3, its temperature is not more than
140℃。
The temperature of sintering deposit to be cooled is generally 800~900 DEG C in method of denitration of the present invention.
It is used as the embodiment of foregoing method of denitration of the invention, it is preferable that when using low-temperature denitration reactor, control
It is to be not less than 250 DEG C to make the flue-gas temperature collected from cooling device first paragraph bellows and cooling device second segment bellows；
When using middle temperature Benitration reactor, control is received from cooling device first paragraph bellows and cooling device second segment bellows
The flue-gas temperature of collection is higher than 350 DEG C.
Preferably, when using low-temperature denitration reactor, the waste-heat recovery device is made to produce 0.6MPa~0.8MPa's
The temperature of saturated vapor and the flue gas after the waste-heat recovery device is is not less than 180 DEG C, preferably at 180~240 DEG C.
It is used as the embodiment of foregoing method of denitration of the invention, it is preferable that when using low-temperature denitration reactor, make
It is 180~240 DEG C by the flue-gas temperature of the dry desulfurization device, dust arrester, and the flue gas feeding of the temperature is described
Low-temperature denitration reactor.
Invention broadly provides directly using sintering deposit heat denitrating system and corresponding method, the denitrating system and
Corresponding method directly utilizes sintering deposit heat, sintering flue gas can be made to carry out denitration on the premise of indigestion additional energy anti-
Should, Efficient Conversion NO thereinx, denitration rate will not cause sintering deposit embrittlement and can reclaim sintering deposit up to 80~90%
Waste heat, specifically, the present invention have the advantages that：
(1) newly-built sintering machine head dust removing can be omitted, and focused on rear end sack cleaner and be uniformly processed, and reduction system is thrown
Money；Existing sintering machine head dust removing system need not be transformed to reduce dust content, and it is bigger that it runs operating flexibility.
(2) sintering deposit cooling device is sent directly into due to sintering device flue gas not cooled as heat transfer medium, sintering cooling
The waste-heat recovery device inlet flue gas temperature of equipment rear end is improved, and utilization ratio is higher, can produce the steam of higher pressure；Cooling is set
Standby rear end waste-heat recovery device can not be circulated with heat transfer medium, be not in dust concentration enrichment, slowed down residual heat system and pipeline
Abrasion.
(3) 80~90% denitration efficiencies are realized, nitrogen oxides can reach minimum discharge index, it is possible to which realize more significantly
The total amount emission reduction of degree.
(4) system does not introduce new thermal source and flue gas is heated up, and while denitration temperature requirement is realized, does not increase the energy and disappears
Consumption, reduces system operation cost.
(5) on the premise of new thermal source is not consumed, a whole set of cleaning system high fume temperature, effectively lifting plume rise is high
Degree, enhanced diffustion ability reduction regional pollution thing concentration, is conducive to the improvement of local area quality of air environment.
Brief description of the drawings
Fig. 1 is that the embodiment of the present invention 1 directly utilizes the low-temperature denitrifying system figure of sintering deposit heat.
Fig. 2 is the middle temperature denitrating system figure that the embodiment of the present invention 3 is directly beneficial to sintering heat.
Label has following meaning in figure：
1：Sintering machine；11：Sintering machine wind box；2：Sintering deposit cooling device；21：Cooling device first paragraph bellows；22：Cooling
Equipment second segment bellows；23：The 3rd section of bellows of cooling device；3：Waste-heat recovery device；4：Dry desulfurization device；5：Dedusting is filled
Put；6：Booster fan；7：Benitration reactor；8：Chimney.
Embodiment
In order to which technical characteristic, purpose and beneficial effect to the present invention are more clearly understood from, in conjunction with specific implementation
Example carries out described further below to technical scheme, it should be understood that these examples are merely to illustrate the present invention rather than limit
The scope of the present invention processed.In embodiment, each Starting reagents material is commercially available, and the experimental method of unreceipted actual conditions is
Conventional method known to art and normal condition, or according to the condition proposed by apparatus manufacturer.
Embodiment 1
Fig. 1 is referred to, it is the low-temperature denitrifying system figure that the present embodiment directly utilizes sintering deposit heat, the low-temperature denitration system
System includes sintering machine 1, sintering deposit cooling device 2, waste-heat recovery device 3, dry desulfurization device 4, dust arrester 5, denitration reaction
Device 7 and chimney 8；The sintering machine is provided with sintering machine wind box 11, and the sintering deposit cooling device 2 is existing central cooler, and it is provided with
Cooling device first paragraph bellows 21 (high temperature section bellows), cooling device second segment bellows 22 (middle-temperature section bellows) and cooling device
Three sections of bellows 23 (low-temperature zone bellows), the exhanst gas outlet of the sintering machine wind box 11 is by being connected to the cooling after pipeline flow dividing
The smoke inlet of equipment first paragraph bellows 21 and the cooling device second segment bellows 22, the cooling device first paragraph bellows 21
And the exhanst gas outlet of the cooling device second segment bellows 22 collect after be connected by pipeline with the waste-heat recovery device 3, institute
Waste-heat recovery device 3, dry desulfurization device 4, dust arrester 5, booster fan 6, Benitration reactor 7 and chimney 8 are stated by pipeline
It is sequentially connected in series；
The present embodiment Benitration reactor 7 is low-temperature denitration reactor, and the low-temperature denitration reactor 7 refers to that carrying out low temperature takes off
The reactor of nitre reaction, low-temperature denitration reaction is using low temperature SCR denitration catalyst in 150~240 DEG C of progress.
The low temperature SCR denitration catalyst that the present embodiment is used is low form vanadium Ti-base catalyst or low form manganese base/iron
Base catalyst, it can carry out low-temperature denitration SCR reactions at 150~240 DEG C, be commercially available.
The present embodiment low-temperature denitration reaction system is newly-built sintering machine head end, and which omits the head dedusting of the sintering machine 1
Device.
The dry desulfurization device that the present embodiment is used is sodium Ji Xuanzhuanpenwuta.Sodium Ji Xuanzhuanpenwuta is used
Desulfurizing agent be sodium carbonate rotating spraying tower.
The dust arrester that the present embodiment is used is sack cleaner.
Specifically low-temperature denitration method is：
The flue gas drawn from newly-built sintering machine wind box 11 collects together, now sinters SO in flue gas2Concentration is
1000mg/Nm3, NOxConcentration is 400mg/Nm3, dust-laden is 3000mg/Nm3, flue-gas temperature is 120 DEG C, and the sintering flue gas is straight
Connect and be introduced into sintering deposit cooling device 2, sintering deposit cross-flow direct heat transfer in sintering deposit cooling device 2 with 800~900 DEG C,
Flue gas is collected from cooling device first paragraph bellows 21 and cooling device second segment bellows 22 after heat exchange, and flue-gas temperature reaches 450
DEG C, flue gas drops to 900mg/Nm through dust-laden after sintering deposit bed on sintering deposit cooling device 23, flue gas is introduced into waste heat and returned
Receiving apparatus 3 directly produces 0.6MPa saturated vapors, is not recycled to receipts heat, flue-gas temperature is down into 200 DEG C, flue gas enters dry method
Desulfurizing tower 4 (sodium Ji Xuanzhuanpenwuta) carries out desulfurization, then by dust arrester 5 (sack cleaner) dedusting, now in flue gas
SO2Concentration is 10mg/Nm3, NOxConcentration is 400mg/Nm3, dust-laden is 10mg/Nm3, flue-gas temperature is 180 DEG C, by being pressurized wind
Machine 6 overcomes SR, and flue gas is blasted into low-temperature denitration reactor 7, by NOxIt is down to 80mg/Nm3, denitration rate is 80%, now
Flue-gas temperature is 165 DEG C, and this flue gas is sent directly into chimney 8 and discharged.
Embodiment 2
The low-temperature denitrifying system that the present embodiment is used is substantially the same manner as Example 1, and different is only that the present embodiment is existing
There is sintering machine, its own is with sintering dust removal device (not shown), and the dust arrester is electric dust collector, the electric precipitation
Device is arranged on the connecting line of sintering machine wind box 11 and cooling device first paragraph bellows 21 and cooling device second segment bellows.
The flue gas drawn from existing sintering machine wind box 11 collects together, now SO in flue gas2Concentration is 2000mg/
Nm3, NOxConcentration is 500mg/Nm3, dust-laden is 2000mg/Nm3, flue-gas temperature is 140 DEG C, and the sintering flue gas is passed through into electric precipitation
Device, 150mg/Nm is down to by dust content3, sintering deposit cooling device 2 is then introduced, the sintering deposit with 800~900 DEG C is in sintering
In ore deposit cooling device 2 after cross-flow direct heat transfer, heat exchange flue gas from cooling device first paragraph bellows 21 and cooling device second segment wind
Case 22 is collected, and flue-gas temperature reaches 500 DEG C, and flue gas is increased to through dust-laden after sintering deposit bed on sintering deposit cooling device 2
400mg/Nm3, flue gas introducing waste-heat recovery device 3 is directly produced into 0.8MPa saturated vapors, receipts heat is not recycled to, by flue gas
Temperature is down to 240 DEG C, and flue gas enters dry desulfurization device 4 (sodium base rotating spraying) tower and carries out desulfurization, then by dust arrester
(sack cleaner) dedusting, now SO in flue gas2Concentration is 10mg/Nm3, NOxConcentration is 500mg/Nm3, dust-laden is 10mg/Nm3,
Flue-gas temperature is 190 DEG C, overcomes SR by booster fan 6, flue gas is blasted into low-temperature denitration reactor 7, by NOxIt is down to
50mg/Nm3, denitration rate is 90%, and now flue-gas temperature is 170 DEG C, and this flue gas is sent directly into chimney 8 and discharged.
Embodiment 3
Fig. 2 is referred to, it is the middle temperature denitrating system figure that the present embodiment directly utilizes sintering deposit heat, the middle temperature denitration system
System includes sintering machine 1, sintering deposit cooling device 2, waste-heat recovery device 3, dry desulfurization device 4, dust arrester 5, middle temperature denitration
Reactor 7 and chimney 8；The sintering machine is provided with sintering machine wind box 11, and the sintering deposit cooling device 2 is existing central cooler, its
Set provided with cooling device first paragraph bellows 21 (high temperature section bellows), cooling device second segment bellows 22 (middle-temperature section bellows) and cooling
Standby 3rd section of bellows 23 (low-temperature zone bellows), the exhanst gas outlet of the sintering machine wind box 11 is described by being connected to after pipeline flow dividing
The smoke inlet of cooling device first paragraph bellows 21 and the cooling device second segment bellows 22, the cooling device first paragraph wind
The exhanst gas outlet of case 21 and the cooling device second segment bellows 22 collect after by pipeline and the middle phase of temperature Benitration reactor 7
Even, the middle temperature Benitration reactor 7, waste-heat recovery device 3, dry desulfurization device 4, dust arrester 5, booster fan 6 and chimney 8
It is sequentially connected in series by pipeline；
The middle temperature Benitration reactor 7 refers to the reactor for carrying out middle temperature denitration reaction, during the middle temperature denitration reaction is utilized
Warm SCR denitration is carried out more than 300 DEG C.
The middling temperature DeNOx catalyst that the present embodiment is used for conventional middle temperature vanadium Ti-base catalyst, its can 350~
420 DEG C of progress low-temperature denitration SCR reactions, are commercially available.
The flue gas drawn from newly-built sintering machine wind box 11 collects together, now sinters SO in flue gas2Concentration is
1500mg/Nm3, NOxConcentration is 500mg/Nm3, dust-laden is 4000mg/Nm3, flue-gas temperature is 110 DEG C, and the sintering flue gas is straight
Connect and be introduced into sintering deposit cooling device 2, sintering deposit cross-flow direct heat transfer in sintering deposit cooling device 2 with 800~900 DEG C,
Flue gas is collected from cooling device first paragraph bellows 21 and cooling device second segment bellows 22 after heat exchange, and flue-gas temperature reaches 430
DEG C, flue gas drops to 1000mg/Nm through dust-laden after sintering deposit bed on sintering deposit cooling device 23, flue gas is introduced into middle temperature and taken off
Nitre reactor 7, the NO after denitrationxConcentration is 50mg/Nm3, denitration efficiency is 90%, and temperature is 415 DEG C, and other specification is constant,
Then flue gas directly produces 0.6MPa saturated vapors into waste-heat recovery device 3, is not recycled to receipts heat, flue-gas temperature is down to
150 DEG C, flue gas enters dry desulfurizing tower 4 (sodium base or calcium Ji Xuanzhuanpenwuta) and carries out desulfurization, then by the (cloth of dust arrester 5
Bag dust collector) dedusting, now SO in flue gas2Concentration is 100mg/Nm3, NOxConcentration is 50mg/Nm3, dust-laden is 10mg/Nm3, cigarette
Temperature degree is 95 DEG C, and this flue gas is sent directly into chimney 8 after booster fan 6 overcomes SR discharges.
What is finally illustrated is：Above example is merely to illustrate the implementation process and feature of the present invention, and unrestricted is sent out
Bright technical scheme, although the present invention is described in detail with reference to above-described embodiment, one of ordinary skill in the art should
Work as understanding：The present invention can still be modified or equivalent substitution, without departing from the spirit and scope of the present invention any
Modification or local replacement, all should cover among protection scope of the present invention.
Claims (10)
1. a kind of denitrating system of direct utilization sintering deposit heat, wherein, it is cold that the denitrating system includes sintering machine (1), sintering deposit
But equipment (2), waste-heat recovery device (3), dry desulfurization device (4), dust arrester (5), booster fan (6), Benitration reactor
And chimney (8) (7)；
The sintering machine (1) is provided with sintering machine wind box (11)；
The sequencing being cooled along sintering deposit to be cooled in the sintering deposit cooling device (2), the sintering deposit cooling is set
Standby (2) are sequentially provided with the 3rd section of cooling device first paragraph bellows (21), cooling device second segment section bellows (22) and cooling device
Bellows (23), the exhanst gas outlet of the sintering machine wind box (11) is connected to the cooling device first paragraph bellows (21) by pipeline
And the smoke inlet of the cooling device second segment bellows (22), the cooling device first paragraph bellows (21) and the cooling are set
The exhanst gas outlet of standby second segment bellows (22) is connected by pipeline with the waste-heat recovery device (3), the waste-heat recovery device
(3), dry desulfurization device (4), dust arrester (5), booster fan (6) and chimney (8) are sequentially connected in series by pipeline；
When the Benitration reactor (7) is low-temperature denitration reactor, its be arranged on the booster fan (6) and chimney (8) it
Between connecting line on, the low-temperature denitration reactor refer to carry out low-temperature denitration reaction reactor, the low-temperature denitration reaction
It is not more than 240 DEG C of progress in temperature using low temperature SCR denitration catalyst, such as in 150~240 DEG C of progress；
When the Benitration reactor (7) is middle temperature Benitration reactor, it is arranged on the cooling device first paragraph bellows (21)
And on the connecting line between the exhanst gas outlet and the waste-heat recovery device (3) of the cooling device second segment bellows (22),
The middle temperature Benitration reactor refers to the reactor for carrying out middle temperature denitration reaction, and the middle temperature denitration reaction utilizes middling temperature DeNOx
Catalyst is more than 300 DEG C progress in temperature, such as in 350~420 DEG C of progress.
2. the denitrating system of direct utilization sintering deposit heat according to claim 1, wherein, the sintering deposit cooling device
(2) it is central cooler.
3. the denitrating system of direct utilization sintering deposit heat according to claim 1, wherein：
When using low-temperature denitration reactor, the cooling device first paragraph bellows (21) and the cooling device second segment bellows
(22) blower fan is additionally provided with the connecting line between exhanst gas outlet and the waste-heat recovery device (3)；
When using middle temperature Benitration reactor, the cooling device first paragraph bellows (21) and the cooling device second segment bellows
(22) blower fan is additionally provided with the connecting line between exhanst gas outlet and the middle temperature Benitration reactor.
4. the denitrating system of direct utilization sintering deposit heat according to claim 1, wherein, the head of the sintering machine is set
Have or be not provided with dust arrester, such as with dust arrester, it is preferably electric dust collector, and the dust arrester is arranged on the sintering
On the connecting line of machine bellows (11) and the cooling device first paragraph bellows (21) and cooling device second segment bellows (22).
5. the denitrating system of direct utilization sintering deposit heat according to claim 1, wherein, the dry desulfurization device
(4) it is sodium base or calcium Ji Xuanzhuanpenwuta.
6. according to the denitrating system of direct utilization sintering deposit heat according to any one of claims 1 to 5, wherein, it is described
Dust arrester (5) is sack cleaner or electric cleaner, preferably sack cleaner.
7. a kind of method of denitration of direct utilization sintering deposit heat, wherein, the method for denitration utilizes any in claim 1~6
Described in directly using the denitrating system of sintering deposit heat, the method for denitration includes the flue gas by sintering machine (1) generation from burning
The cooling device first paragraph bellows (21) and cooling device are not introduced to after knot machine bellows (11) removing dust or after removing dust
In two sections of bellows (22), make itself and sintering deposit cross-flow direct heat transfer to be cooled, the flue gas after direct heat transfer is set from the cooling
Standby first paragraph bellows (21) and cooling device second segment bellows (22) are collected, then in turn through the waste-heat recovery device
(3), dry desulfurization device (4), dust arrester (5), booster fan (6), low-temperature denitration reactor and chimney (8) are discharged afterwards, or
Sequentially pass through the middle temperature denitrification apparatus, waste-heat recovery device (3), dry desulfurization device (4), dust arrester (5), supercharging
Blower fan (6) and chimney (8) are discharged afterwards；
Preferably, the flue gas being collected from the cooling device first paragraph bellows and cooling device second segment bellows is directly by institute
State waste-heat recovery device reclaim a heat and without circulation and stress heat.
8. the method for denitration of direct utilization sintering deposit heat according to claim 7, wherein, the cigarette that the sintering machine is produced
SO in gas2Concentration be not more than 3000mg/Nm3, NOxConcentration is not more than 1000mg/Nm3, dust-laden is not more than 10g/Nm3, its temperature
For 80~180 DEG C；
Preferably, NO in the flue gasxConcentration is not more than 500mg/Nm3, its temperature is not more than 140 DEG C.
9. the method for denitration of direct utilization sintering deposit heat according to claim 8, wherein：
When using low-temperature denitration reactor, control what is collected from cooling device first paragraph bellows and cooling device second segment bellows
Flue-gas temperature is to be not less than 250 DEG C；
When using middle temperature Benitration reactor, control what is collected from cooling device first paragraph bellows and cooling device second segment bellows
Flue-gas temperature is to be not less than 350 DEG C；
Preferably, when using low-temperature denitration reactor, the waste-heat recovery device is made to produce 0.6MPa~0.8MPa saturation
The temperature of steam and the flue gas after the waste-heat recovery device is is not less than 180 DEG C, preferably at 180~240 DEG C.
10. the method for denitration of direct utilization sintering deposit heat according to claim 9, wherein, when anti-using low-temperature denitration
When answering device, it is 180~240 DEG C to make by the flue-gas temperature of the dry desulfurization device, dust arrester, and by the flue gas of the temperature
Send into the low-temperature denitration reactor.
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| CN108079777A (en) * | 2017-11-28 | 2018-05-29 | 石河子大学 | A kind of coal-fired plant flue gas low-temperature denitration method and its device |
| CN109173654A (en) * | 2018-10-31 | 2019-01-11 | 山东师范大学 | A kind of SCR denitration process of sintering flue gas |
| CN109351181A (en) * | 2018-11-26 | 2019-02-19 | 南京杰科丰环保技术装备研究院有限公司 | A kind of method and system of the wide temperature SCR denitrating flue gas of integrated form |
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| CN109893996A (en) * | 2019-03-25 | 2019-06-18 | 秦皇岛新特科技有限公司 | The processing equipment and processing method of clinker flue gas with tail portion purification function |
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| CN111678350A (en) * | 2020-06-03 | 2020-09-18 | 首钢集团有限公司 | Sintering flue gas cooling sinter system |
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