CN107726873A - A kind of sintering flue gas is segmented and utilized perpendicular cold kiln emission reduction sulphur, the method for nitrogen oxides - Google Patents
A kind of sintering flue gas is segmented and utilized perpendicular cold kiln emission reduction sulphur, the method for nitrogen oxides Download PDFInfo
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- CN107726873A CN107726873A CN201711103072.9A CN201711103072A CN107726873A CN 107726873 A CN107726873 A CN 107726873A CN 201711103072 A CN201711103072 A CN 201711103072A CN 107726873 A CN107726873 A CN 107726873A
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- flue gas
- sintering
- denitration
- cold kiln
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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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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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
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/005—Systems for reclaiming waste heat including pyrolising the waste gases
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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
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
Flue gas segmentation is sintered the present invention relates to a kind of and using the method for erecting cold kiln emission reduction sulphur, nitrogen oxides, including sinters flue gas segmentation, high NOXDenitration flue gas is exchanged heat with heat sinter in cold kiln is erected, and NO is removed using SCRXTechnique, high SO2Desulfurization fume removes SO2Technique.The present invention using sintering deposit erects cold kiln novel technique for cooling, can high efficiente callback sintering mine sensible heat resource, the comprehensive utilization for sintering mine sensible heat resource is significant；Meanwhile the present invention erects cold kiln novel technique for cooling using sintering deposit and combines existing ripe denitration SCR techniques, without supplementing a large amount of additional heats, the sensible heat resource of sintering deposit is more rationally sufficiently used, reduces sintering denitration cost, new way is provided for sintering denitration.
Description
Technical field
The present invention relates to sintering fume treatment technical field, more particularly to a kind of sintering flue gas to be segmented and be subtracted using cold kiln is erected
Desulphurization, the method for nitrogen oxides.
Background technology
For steel production in China based on the long flow of blast furnace-converter, converter steel ratio reaches more than 90%.China's blast furnace burden
Sintering deposit ratio reaches 70%~75% in structure, and China's Sintering Yield reaches 9.01 hundred million tons within 2014.Sintering circuit is discharged
SO2And NOXSteel Production Flow Chart SO is accounted for respectively2And NOXThe 60% and 50% of discharge, is the main pollution process of iron and steel enterprise.
2012, Chinese Ministry of Environmental Protection, which promulgates, to be performed《Steel sintering, pelletizing industrial air pollution thing discharge standard》(GB28662-2012), increase newly
NOXHe dioxin emission limit values, and improve the discharge standard of existing pollutant.The lifting of environmental protection standard will increase enterprise operation
Pressure, quickening eliminates the backward production facilities and cropping system and soil management, promotes to be unsatisfactory for desired corporation withdrawal market, environmental protection of enterprise pressure
It is huge.
China's sintering flue gas desulfurization has achieved significant effect at present, ends for the end of the year 2015, national Key Iron And Steel
Sintering machine desulfuration area has increased to 13.8 ten thousand square metres, and installation rate 19% increased to 88% by 2005.With this formation pair
Ratio, made slow progress in terms of denitrating flue gas is sintered, the sintering denitrification apparatus that China has been reported that less than 10, wherein mainly with
Based on activated carbon method, activated carbon method can remove SO simultaneously2、NOXJi bioxin and other harmful substances, but the process operation expense
Height, cost of investment are big, are difficult to be widely popularized under the stagnant background in steel market.
It is presently used for the selective noncatalytic reduction of main technique (SNCR) and SCR of denitrating flue gas
Method (SCR).Because sintering flue gas mean temperature is only 120~150 DEG C, it can not directly meet SNCR (900~1100 DEG C) and SCR
(200~450 DEG C) technique carries out the condition of denitration, it is necessary to additionally supplement certain heat, increases operating cost, especially SNCR
Method is, it is necessary to substantial amounts of heat.China's sintering mine sensible heat proportion of utilization is very low, and only 6%, sintering deposit per ton there are about 0.9GJ's
Heat energy does not utilize.
Because the technological parameters such as sintering machine area, operation are different, SO in different sintering device flue gas amounts, flue gasxAnd NOXIt is dense
Spend different.Application No. 201710249584.X, entitled a kind of agglomeration for iron mine flue gas segmentation enrichment and waste heat profit
With emission reduction SOxAnd NOXMethod, only account for smaller, the perpendicular cold kiln heat of sintering exhaust gas volumn and lift sintering flue-gas temperature enough to denitration
The situation of temperature；For the big sintering machine of sintering exhaust gas volumn, can not be applicable completely, and can not be to NOXCarry out whole heat exchange.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of sintering flue gas is segmented and utilized perpendicular cold kiln emission reduction sulphur, nitrogen oxygen
The method of compound, existing sintering mine sensible heat utilization rate is low, sintering desulfuration device popularity rate is higher solving, and takes off sintering nitre and lacks
The problem of possible technique.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of sintering flue gas is segmented and utilized perpendicular cold kiln emission reduction sulphur, the method for nitrogen oxides, including sintering flue gas segmentation, height
NOXDenitration flue gas is exchanged heat with heat sinter in cold kiln is erected, and NO is removed using SCRXTechnique, high SO2Desulfurization fume removes
SO2Technique.
The present invention has the beneficial effect that：The present invention passes through heat sinter and high NO by the way that sintering flue gas is segmentedX
Denitration flue gas erect cold kiln in exchanged heat because sintering deposit erect cold kiln novel technique for cooling can high efficiente callback sintering mine sensible heat money
Source, the comprehensive utilization for sintering mine sensible heat resource is significant, meanwhile, cold kiln novel technique for cooling knot is erected using sintering deposit
Existing ripe denitration SCR techniques are closed, without supplementing a large amount of additional heats, are more rationally sufficiently used the sensible heat money of sintering deposit
Source, sintering denitration cost is reduced, new way is provided for sintering denitration.
On the basis of such scheme, the present invention has also done following improvement：
Further, it is described sintering flue gas be segmented into along sintering machine traffic direction, by sintering machine entrance to export direction according to
The sintering bellows of secondary arrangement are divided into fore-end and rear end part, and the fore-end accounts for the 40% of the sintering bellows total quantity
~60%, the flue gas in the fore-end bellows is high NOXDenitration flue gas, the rear end part account for the sintering bellows sum
The 60%~40% of amount, the flue gas in the rear end part bellows is high SO2Desulfurization fume.
It is using the above-mentioned further beneficial effect of scheme：With reference to sintering flue gas front end NOXConcentration is high, SO2Concentration is low, cigarette
The characteristics of temperature degree is low, remove NOXNeed to lift temperature, after flue gas is segmented, reduce the exhaust gas volumn for needing to heat, reduce the energy
Consumption.
Further, the high NOXDenitration flue gas meets that temperature is 80 DEG C~110 DEG C, SO2Concentration is 50mg/m3~140mg/
m3, NOXConcentration is 30mg/m3~300mg/m3；The high SO2Desulfurization fume meets that temperature is 100 DEG C~400 DEG C, SO2Concentration is
300mg/m3~2500mg/m3, NOXConcentration is 20mg/m3~200mg/m3。
It is using the above-mentioned further beneficial effect of scheme：With reference to national environmental standard, leading portion selection SO2Concentration is relatively low,
It need not handle, make NO as far as possibleXConcentration is higher, is advantageous to improve denitration efficiency, saves denitration cost；Back segment selects NOXConcentration compared with
It is low, need not handle, make SO as far as possible2Concentration is higher, is advantageous to improve desulfuration efficiency, saves desulphurization cost.
Further, the high NOXDenitration flue gas is blasted by air-introduced machine from the perpendicular cold kiln bottom, the heat sinter
Fallen into after crusher in crushing in described erect at the top of cold kiln, the high NOXDenitration flue gas enters with the heat sinter after crushing
Row heat exchange；The high NO after heat exchangeXThe temperature of denitration flue gas is 350 DEG C~450 DEG C；By the high NO after heat exchangeXDenitration cigarette
Tympanites enters SCR denitration device removing NOX。
The present invention loads the sintering deposit after hot crush at the top of perpendicular cold kiln, and the high NO with being blasted from perpendicular cold kiln bottomX
Denitration flue gas carries out reverse heat exchange, can high efficiente callback sintering mine sensible heat resource, the comprehensive utilization for sintering mine sensible heat resource
It is significant.
Further, the high NOXDenitration flue gas is divided into two parts, and a part is erected under cold kiln by air-introduced machine from described
Portion blasts described erect and exchanged heat in cold kiln, and another part blasts afterburner by air-introduced machine；The high NO of two partsXIt is de-
Smoke of gunpowder gas converges after the perpendicular cold kiln and the afterburner, converges the rear high NOXThe temperature of denitration flue gas be 400 DEG C~
450℃；The high NO after convergingXDenitration flue gas blasts SCR denitration device removing NOX。
The present invention is by high NOXIt is to prevent from erecting heat sinter in cold kiln to be insufficient for high NO that denitration flue gas, which is divided into two parts,X
The heat exchange of denitration flue gas.
Further, SCR denitration device removing NOXDenitration flue gas afterwards is passed through waste heat boiler generation steam and generated electricity,
The denitration flue-gas temperature is reduced to less than 140 DEG C.
Flue-gas temperature still meets Waste Heat Generation requirement after denitration of the present invention, and considerable economic effect can be produced by generating electricity
Benefit；Denitration flue-gas temperature is reduced to less than 140 DEG C, can preferably utilize flue gas heat, be advantageous to reclaim more energy.
Further, the high SO2Desulfurization fume removes SO2Technique is by the high SO2Desulfurization fume removing dust device removes
Dirt, it will decrease to less than 140 DEG C of denitration flue gas and the high SO after dedusting2Desulfurizer is blasted after desulfurization fume mixing to take off
Except SO2。
The present invention continues desulfurization to the denitration flue gas that temperature reduces, it is ensured that the real safety compliance discharge of sintering flue gas, it is comprehensive
Emission reduction effect is notable.
Further, the denitration flue gas and the high SO after dedusting2The mixed temperature of desulfurization fume 180 DEG C with
Under.
It is a kind of that perpendicular cold kiln emission reduction sulphur, the system of nitrogen oxides, including sintering machine, burning are segmented and utilized applied to sintering flue gas
Bellows, perpendicular cold kiln, SCR denitration device, waste heat boiler and desulfurizer are tied, from the entrance of the sintering machine to export direction successively
The sintering bellows are arranged, the sintering bellows are divided into Part I and Part II along the sintering machine traffic direction, described
Part I is connected with cold kiln, SCR denitration device, the waste heat boiler of erecting successively by pipeline, and the Part II passes through pipe
Road is connected with the desulfurizer, and the bottom of the waste heat boiler is connected with the arrival end pipeline of the desulfurizer.
Further, in addition to afterburner and TRT, one end of the afterburner pass through pipe with the Part I
Road is connected, and the other end of the afterburner is connected with the port of export for erecting cold kiln；The TRT and the waste heat boiler
The port of export be connected by pipeline.
Beneficial effects of the present invention are：
1. the present invention using sintering deposit erects cold kiln novel technique for cooling, can high efficiente callback sintering mine sensible heat resource, for sintering
The comprehensive utilization of ore deposit sensible heat resource is significant；
2nd, the present invention erects cold kiln novel technique for cooling using sintering deposit and combines existing ripe denitration SCR techniques, big without supplementing
Additional heat is measured, is more rationally sufficiently used the sensible heat resource of sintering deposit, reduces sintering denitration cost, is carried for sintering denitration
For new way；
3. present invention flue-gas temperature after denitration still meets Waste Heat Generation requirement, considerable economy can be produced by generating electricity
Benefit；
4. the present invention continues desulfurization to the denitration flue gas that temperature reduces, it is ensured that the real safety compliance discharge of sintering flue gas, it is comprehensive
It is notable to close emission reduction effect；
5. present invention process method applicability is strong, it can be not only used for built sintering desulfuration facility enterprise and increase denitration project newly and change
Build the project of original sintering deposit cooling technique, it can also be used to which newly-built enterprise builds desulfuring and denitrifying apparatus project simultaneously.
In the present invention, it can also be mutually combined between above-mentioned each technical scheme, to realize more preferred compositions schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or is understood by implementing the present invention.The purpose of the present invention and other advantages can by write specification, right
Specifically noted structure is realized and obtained in claim and accompanying drawing.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference symbol represents identical part.
Fig. 1, which is segmented and utilized for present invention sintering flue gas, erects cold kiln emission reduction sulphur, nitrogen oxides process flow diagram.
In figure, 1- sintering machines, 2- sintering bellows, 3- denitration section flues, 4- desulfurization section flues, 5- disintegrating machines, 6- thermal sinterings
Ore deposit, 7- denitration air-introduced machines, 8- erect cold kiln, 9- afterburners, 10-SCR denitrification apparatus, 11- waste heat boilers, 12- steam, 13- steamers
Generating set, 14- dedusters, 15- desulfurization air-introduced machines, 16- desulfurizers, 17- chimneys.
Embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing forms the application part, and
It is used for the principle for explaining the present invention together with embodiments of the present invention, is not intended to limit the scope of the present invention.
It is a kind of brand-new sintering deposit cooling and waste heat reclaiming process technology that sintering deposit, which erects cold kiln cooling technology, the technique
Flow is：Sintering deposit of the heat after broken is loaded in a vertical cooling kiln from top, and with being blasted from vertical cooling kiln bottom
Cooling air carry out reverse heat exchange；Wind is cooled down while sintering deposit is cooled down, own temperature gradually rises, perpendicular cold reaching
After the charge level of kiln top, temperature can reach 380 DEG C~450 DEG C or so, be changed into high-temperature hot-air.And high-temperature hot-air acts in air-introduced machine
Under, generated electricity after thick depositing dust by waste heat boiler generation steam, less than 140 DEG C low temperature hot blasts of boiler latter end remove through secondary
After dirt, can qualified discharge or carry out low temperature hot blast secondary use.Sintering deposit after cooling is arranged by perpendicular cold kiln bottom portion discharge gate
Be sent on belt feeder be sent to screening station sieved.
With conventional sintering ore deposit heat recovery technology such as ring it is cold, with it is cold and it is random cooling compared with, sintering deposit erects cold kiln bosher
The waste heat recovery rate of skill can improve more than 50%, and waste heat recovery total amount greatly improves, and can reclaim sintering mine sensible heat to greatest extent.
Wherein caused 380 DEG C~450 DEG C of High-temperature cooling wind, it can just meet the temperature requirement needed for SCR denitration technique.From section
Energy emission reduction and the angle of energy utilization, the mode that cold firer's skill combination SCR denitration technique is erected using sintering deposit are sintered denitration
With significant advantage.
The specific embodiment of the present invention, disclose a kind of sintering flue gas segmentation and utilize and erect cold kiln emission reduction sulphur, nitrogen oxygen
The method of compound, as shown in figure 1, comprising the following steps：
Step 1. will sinter flue gas segmentation along the traffic direction of sintering machine 1, wherein, the direction of arrow of the upper end of sintering machine 1 in Fig. 1
For the traffic direction of sintering machine 1；It is high NO to divide the front end 40%~60% of sintering machine 1 and sinter flue gas in bellows 2XDenitration flue gas, after
Flue gas is high SO in the sintering bellows 2 of end 60%~40%2Desulfurization fume；The high NOXDenitration flue-gas temperature is 80 DEG C~110 DEG C,
SO2Concentration 50mg/m3~140mg/m3, NOXConcentration 30mg/m3~300mg/m3；High SO2About 100 DEG C of the temperature of desulfurization fume~
400 DEG C, SO2Concentration 300mg/m3~2500mg/m3, NOXConcentration 20mg/m3~200mg/m3；
The high NO of step 2.XDenitration flue gas exchanges heat with heat sinter；High NOXDenitration flue gas enters in cold kiln is erected with heat sinter
Row heat exchange, high NO after heat exchangeXDenitration flue-gas temperature is up to 350 DEG C~450 DEG C；Use the high NO after afterburner heat exchangingXDenitration cigarette
Gas carries out heat supplement, the high NO being always ensured that after heat exchangeXDenitration flue gas meets needed for SCR (SCR) denitration
400 DEG C~450 DEG C of optimum temperature；Wherein, the catalyst that SCR (SCR) denitration uses can use V2O5-WO3/
TiO2、V2O5-MoO3/TiO2、V2O5/TiO2Or other are applied to high NOXThe catalyst of denitration smoke characteristic；The reducing agent of use
Ammoniacal liquor is preferably selected, is obtained by evaporator or other modes and is greater than or equal to high NOXThe temperature of denitration flue gas；
Flue gas after step 3. denitration further can produce steam using waste heat boiler and be sent out still up to more than 400 DEG C
Electricity, the flue-gas temperature after subsequent denitration are reduced to less than 140 DEG C；
The high SO of step 4.2It is reduced to temperature less than 140 DEG C of denitration flue gas after desulfurization fume dedusting to mix, mixed flue gas
Temperature be reduced to less than 180 DEG C, utilize existing or newly-built sulfur removal technology removing SO2Qualified discharge afterwards.
Another specific embodiment of the present invention, disclose a kind of sintering flue gas segmentation and utilize and erect cold kiln emission reduction sulphur, nitrogen
The system of oxide process, as shown in figure 1, including sintering machine 1, bellows 2 are sintered, denitration section flue 3, desulfurization section flue 4, are crushed
Machine 5, heat sinter 6, denitration air-introduced machine 7, erect cold kiln 8, afterburner 9, SCR denitration device 10, waste heat boiler 11, steam 12, vapour
Turbine generator group 13, deduster 14, desulfurization air-introduced machine 15, desulfurizer 16, chimney 17；
Wherein, multiple sintering bellows 2 are arranged in order from the entrance of sintering machine 1 to export direction, are opened from the entrance of sintering machine 1
Begin, be followed successively by denitration section flue 3 and desulfurization section flue 4, denitration section flue 3 is the 40%~60% of the sintering total quantity of bellows 2, is taken off
Sulphur section flue 4 includes remaining sintering bellows 2；
Disintegrating machine 5 is arranged on the exit of sintering machine 1, and after the sintered machine 1 of heat sinter 6 sinters, it is broken to lead to disintegrating machine 5
Afterwards, fall into perpendicular cold kiln 8 and cooled down from the top for erecting cold kiln 8；
Denitration section flue 3 is connected with denitration air-introduced machine 7, and denitration air-introduced machine 7 is respectively with erecting the bottom of cold kiln 8, the phase of afterburner 9
Even, it is noted that working as high NO caused by sintering machine 1XDenitration flue gas is more, then the high NO that denitration air-introduced machine 7 is extractedXDenitration cigarette
Gas is more, and the heat sinter 6 erected in cold kiln 8 is not enough to provide high NOXHeat needed for denitration flue gas, it is therefore, right using afterburner 9
A part of high NOXDenitration flue gas carries out concurrent heating, and afterburner 9 is with erecting the high NO in cold kiln 8 in the present embodimentXDenitration exhaust gas volumn is equal,
But the present invention is not limited to this, as long as disclosure satisfy that the high NO into SCR denitration device 10XThe temperature of denitration flue gas reaches
To between 400~450 DEG C；As high NO caused by sintering machine 1XWhen denitration flue gas is not many, heat sinter is enough to sintering
High NO caused by machine 1XDenitration flue gas is exchanged heat, then need not use afterburner 9；Therefore, the present invention can be used alone
Erect cold kiln to be exchanged heat, perpendicular cold kiln can also be used to be applied in combination with afterburner.
Afterburner 9 is with erecting the high NO in cold kiln 8XPipeline after denitration flue gas collects is connected with SCR denitration device 10, SCR
Denitrification apparatus 10 is connected with waste heat boiler 11, by the high NO after reductionXDenitration flue gas is delivered to waste heat boiler 11, because after reduction
High NOXThe temperature of denitration flue gas is higher than 400 DEG C, therefore, the high NO after reductionXDenitration flue gas produces steaming by waste heat boiler 11
Vapour 12, steam 12 are used for the generating of Turbo-generator Set 13；
Desulfurization section flue 4 is connected with deduster 14, desulfurization air-introduced machine 15 successively, the high SO that desulfurization air-introduced machine 15 is conveyed2
Desulfurization fume by the denitration flue gas after waste heat boiler 11 with being mixed into desulfurizer 16, then after the processing of desulfurizer 16
Discharged through chimney 17；It is noted that it is less than 140 DEG C by the temperature of the denitration flue gas after waste heat boiler 11, with high SO2Desulfurization
The mixed temperature of flue gas is less than 180 DEG C.
Another specific embodiment of the present invention, it is specific as follows by taking enterprise's sintering machine as an example：
Embodiment
With certain enterprise 270m2Exemplified by sintering machine, totally 24 bellows, its flue gas concentration see the table below.
Flue gas in 1-14 sintering bellows is mixed into high NOXDenitration flue gas, 15-24 bellows flue gases are mixed into high SO2It is de-
Sulphur flue gas, high NO after mixingXThe exhaust gas volumn of denitration flue gas is 19.5 ten thousand m3/ h, 88 DEG C of temperature, SO2Concentration 88mg/m3, NOXConcentration
229mg/m3；High SO2The m of exhaust gas volumn 24.1 ten thousand of desulfurization fume3/ h, 231 DEG C of temperature, SO2Concentration 1491mg/m3, NOXConcentration
84mg/m3。
By high NOXDenitration flue gas is exchanged heat with heat sinter in cold kiln is erected, after heat exchange flue-gas temperature up to 350 DEG C~
450℃；Heat supplement is carried out using flue gas after afterburner heat exchanging, is always ensured that high NOXDenitration flue gas meets selective catalysis
Reduce 400 DEG C~450 DEG C of optimum temperature needed for (SCR) denitration；
Ammonia steam is passed through in the SCR denitration device of built-in catalyst and carries out reduction denitration, NO in flue gasXRemoval efficiency is
More than 80%~90%, selective-catalytic-reduction denitrified reaction equation is as follows：
Above-mentioned two reaction is exothermic reaction, but high NOXNO in denitration flue gasXContent is relatively low and exhaust gas volumn is larger, because
Smoke temperature change is little before and after this denitration, still up to more than 400 DEG C, further can produce steam using waste heat boiler and be sent out
Electricity, subsequent denitration flue-gas temperature are reduced to less than 150 DEG C.
High SO2It is reduced to temperature less than 140 DEG C of denitration flue gas after desulfurization fume dedusting to mix, the temperature of mixed flue gas
Less than 180 DEG C are reduced to, SO is removed using existing or newly-built sulfur removal technology2Qualified discharge afterwards.
In summary, flue gas segmentation and the side using perpendicular cold kiln emission reduction sulphur, nitrogen oxides are sintered the invention provides a kind of
Method, the present invention using sintering deposit erect cold kiln novel technique for cooling can high efficiente callback sintering mine sensible heat resource, for sintering mine sensible heat money
The comprehensive utilization in source is significant, meanwhile, cold kiln novel technique for cooling is erected using sintering deposit and combines existing ripe denitration SCR works
Skill, without supplementing a large amount of additional heats, be more rationally sufficiently used the sensible heat resource of sintering deposit, reduce sintering denitration into
This, new way is provided for sintering denitration.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.
Claims (10)
1. a kind of sintering flue gas is segmented and utilized perpendicular cold kiln emission reduction sulphur, the method for nitrogen oxides, it is characterised in that including sintering cigarette
Qi leel section, high NOXDenitration flue gas is exchanged heat with heat sinter in cold kiln is erected, and NO is removed using SCRXTechnique, high SO2Desulfurization
Flue gas removes SO2Technique.
2. a kind of sintering flue gas according to claim 1, which is segmented and utilized, erects cold kiln emission reduction sulphur, the method for nitrogen oxides, its
It is characterised by, the sintering flue gas is segmented into along sintering machine traffic direction, and sintering machine entrance to export direction is arranged in order
Sintering bellows be divided into fore-end and rear end part, the fore-end account for the sintering bellows total quantity 40%~
60%, the flue gas in the fore-end bellows is high NOXDenitration flue gas, the rear end part account for the sintering bellows total quantity
60%~40%, the flue gas in the rear end part bellows is high SO2Desulfurization fume.
3. a kind of sintering flue gas according to claim 1, which is segmented and utilized, erects cold kiln emission reduction sulphur, the method for nitrogen oxides, its
It is characterised by, the high NOXDenitration flue gas meets that temperature is 80 DEG C~110 DEG C, SO2Concentration is 50mg/m3~140mg/m3, NOX
Concentration is 30mg/m3~300mg/m3；The high SO2Desulfurization fume meets that temperature is 100 DEG C~400 DEG C, SO2Concentration is
300mg/m3~2500mg/m3, NOXConcentration is 20mg/m3~200mg/m3。
4. a kind of sintering flue gas according to claim 1, which is segmented and utilized, erects cold kiln emission reduction sulphur, the method for nitrogen oxides, its
It is characterised by, the high NOXDenitration flue gas is blasted by air-introduced machine from the perpendicular cold kiln bottom, and the heat sinter is through disintegrating machine
Fallen into after broken in described erect at the top of cold kiln, the high NOXDenitration flue gas is exchanged heat with the heat sinter after crushing；Change
The high NO after heatXThe temperature of denitration flue gas is 350 DEG C~450 DEG C；By the high NO after heat exchangeXDenitration flue gas blasts SCR
Denitrification apparatus removes NOX。
5. a kind of sintering flue gas according to claim 1, which is segmented and utilized, erects cold kiln emission reduction sulphur, the method for nitrogen oxides, its
It is characterised by, the high NOXDenitration flue gas is divided into two parts, and a part blasts institute by air-introduced machine from the perpendicular cold kiln bottom
State and exchanged heat in perpendicular cold kiln, another part blasts afterburner by air-introduced machine；The high NO of two partsXDenitration flue gas passes through
Converge after the perpendicular cold kiln and the afterburner, converge the rear high NOXThe temperature of denitration flue gas is 400 DEG C~450 DEG C；It will converge
The high NO after conjunctionXDenitration flue gas blasts SCR denitration device removing NOX。
6. a kind of sintering flue gas according to claim 4 or 5 is segmented and utilized perpendicular cold kiln emission reduction sulphur, the side of nitrogen oxides
Method, it is characterised in that SCR denitration device removes NOXDenitration flue gas afterwards is passed through waste heat boiler generation steam and generated electricity, described
Denitration flue-gas temperature is reduced to less than 140 DEG C.
7. a kind of sintering flue gas according to claim 1, which is segmented and utilized, erects cold kiln emission reduction sulphur, the method for nitrogen oxides, its
It is characterised by, the high SO2Desulfurization fume removes SO2Technique is by the high SO2Desulfurization fume removing dust device dedusting, will be reduced
The high SO to less than 140 DEG C of denitration flue gases and dedusting2Desulfurizer removing SO is blasted after desulfurization fume mixing2。
8. a kind of sintering flue gas according to claim 7, which is segmented and utilized, erects cold kiln emission reduction sulphur, the method for nitrogen oxides, its
It is characterised by, the denitration flue gas and the high SO after dedusting2The mixed temperature of desulfurization fume is below 180 DEG C.
9. a kind of be applied to the segmentation of sintering flue gas and utilize perpendicular cold kiln emission reduction sulphur, the system of nitrogen oxides, it is characterised in that including
Sintering machine, sintering bellows, perpendicular cold kiln, SCR denitration device, waste heat boiler and desulfurizer, from the entrance of the sintering machine to going out
Mouth direction is arranged in order the sintering bellows, and the sintering bellows are divided into Part I and second along the sintering machine traffic direction
Part, the Part I are connected with cold kiln, SCR denitration device, the waste heat boiler of erecting successively by pipeline, described second
Divide and be connected by pipeline with the desulfurizer, the bottom of the waste heat boiler and the arrival end pipeline phase of the desulfurizer
Even.
A kind of it is applied to the segmentation of sintering flue gas and using erecting cold kiln emission reduction sulphur, nitrogen oxides 10. according to claim 9
System, it is characterised in that also pass through pipeline with the Part I including afterburner and TRT, one end of the afterburner
It is connected, the other end of the afterburner is connected with the port of export for erecting cold kiln；The TRT and the waste heat boiler
The port of export is connected by pipeline.
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