CN104174287B - A kind of sintering machine partial fume denitrating system and method - Google Patents
A kind of sintering machine partial fume denitrating system and method Download PDFInfo
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- CN104174287B CN104174287B CN201410382738.9A CN201410382738A CN104174287B CN 104174287 B CN104174287 B CN 104174287B CN 201410382738 A CN201410382738 A CN 201410382738A CN 104174287 B CN104174287 B CN 104174287B
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Abstract
The invention provides a kind of sintering machine partial fume denitrating system and method.This system includes: deduster, main exhauster of sintering, desulfurizer, desulfurization air-introduced machine, heat riser, denitrification apparatus, denitration air-introduced machine, not denitration flue and chimney；Sintering device handpiece fume emission mouth is sequentially connected with deduster, main exhauster of sintering, desulfurizer and desulfurization air-introduced machine, then not denitration flue and heat riser are connected respectively by pipeline and threeway, heat riser is connected with denitrification apparatus and denitration air-introduced machine successively, is then connected to chimney by pipeline and threeway together with not denitration flue.The method includes: under the effect of main exhauster of sintering and desulfurization air-introduced machine, the sintering flue gas removing dust device making sintering device handpiece fume emission mouth discharge enters desulfurizer, flue gas after desulfurization is partly into not denitration flue, another part enters denitrification apparatus through heat riser under the effect of denitration air-introduced machine, then mixes through smoke stack emission with the flue gas after desulfurization through not denitration flue.
Description
Technical field
The present invention relates to a kind of sintering machine partial fume denitrating system and method, belong to smelting iron and steel technical field.
Background technology
Along with development and the raising day by day of living standards of the people of national economy, it is increasing that environmental problem obtains people
Pay attention to, and as pollutant closely-related with air quality, nitrogen oxides is constantly subjected to paying close attention to of country.Steel
Iron enterprise sintering machine also receives more and more attention as emphasis NOx emission source, its denitration, and " key area is big
Gas prevention and cure of pollution " 12 " are planned " it is distinctly claimed and carries out nitrogen oxides pollution preventing and treating comprehensively, actively develop sintering machine cigarette
Qi exhaustion nitre is demonstrated, and " prevention and control of air pollution action plan " that in September, 2013 is issued requires to accelerate emphasis row especially
Industry denitration is transformed.
Sintering machine is the NOx emission source that steel plant are maximum, accounts for the 50%-60% of steel plant's nitrogen oxide emission (no
Containing power plant for self-supply), average emission concentration is mostly at 200-400mg/Nm3, also there is the higher situation of minority concentration,
Part is difficult to meet GB28662-2012 " steel sintering, pelletizing industrial air pollution thing discharge standard ".At present
The NO that GB28662 requiresxConcentration of emission is 300mg/Nm3, certainly more and more higher along with environmental requirement, it is also possible to
Concentration of emission can be reduced further.
The most ripe denitration technology includes the SNCR method (SNCR) used when 800 DEG C-1000 DEG C,
280 DEG C-420 DEG C middle temperature selective catalytic reduction methods (SCR) used, and 150 DEG C-200 DEG C and temperatures above make
With and require the low-temperature SCR of low sulfur dioxide concentration, but be because sintering flue gas low-temperature and containing spies such as sulfur dioxide
Property, it is difficult to the above-mentioned technology of directly transplanting.Sintering flue-gas temperature is generally below 150 DEG C, and sulfur dioxide concentration is many 800
mg/Nm3-1500mg/Nm3, after wet desulphurization, cigarette temperature is many at 50 DEG C-60 DEG C, and after dry desulfurization, cigarette temperature can reach
70 DEG C-90 DEG C, but before and after desulfurization, all cannot meet SCR reaction condition.
CN101810999A discloses a kind of partial fume denitrating method, concretely comprises the following steps: collect sintering machine height nitrogen oxygen
The flue gas of compound concentration range first dedusting, rear denitration；Collect low concentration region flue gas dedusting；By above-mentioned two parts
Carry out desulfurization after flue gas mixing, then drain into air.This technology belongs to selective denitrification, and it carries out denitration before desulfurization,
I.e. denitration sulfur dioxide in flue gas concentration is higher, it is meant that be only capable of use Medium temperature SCR (280 DEG C-420 DEG C), and this
The lucky temperature of partial fume is relatively low, so needing significantly to heat up flue gas, can offset employing partial fume denitrating
The effect that the energy consumption brought reduces；Additionally sulfur dioxide in flue gas concentration is higher, then identical in SCR reacts
SO2/SO3In the case of conversion ratio, newly-generated SO3Amount is relatively big, and when follow-up desulfurization uses the most frequently used wet desulphurization,
To SO3Removal efficiency is relatively low, can cause new pollution；Because realizing partial fume denitrating by the transformation of front end smoke box,
On the one hand denitrating system cannot cut out maintenance in the case of not affecting sintering machine, the most also cannot be by increasing
The most possible tightened up discharge standards of measure reply such as treating capacity.And the enforcement of this system and method needs existing
Sintering flue gas system and flue gas desulphurization system and technique transform largely, expend resource and expense.
CN103463976A discloses a kind of flue gas denitrification system and method, concretely comprising the following steps of the method: at sintering
After main exhauster, after whole flue gases are by once heat up heat-exchange device, secondary temperature elevation heater, enter SCR
Denitrification apparatus carries out denitration.Wherein, secondary temperature elevation heater use pipe burner, fuel use coke-stove gas,
Blast furnace gas or natural gas etc..Similar shortcoming, denitration sulfur dioxide in flue gas concentration is there is in this technology with above-mentioned technology
Higher, it is meant that to be only capable of using Medium temperature SCR (280 DEG C-420 DEG C), so needing flue gas is significantly heated up,
Whole exhaust gas volumns are significantly heated up consuming aniseed fuel or the energy；Additionally sulfur dioxide in flue gas concentration is higher,
Then identical in SCR reacts SO2/SO3In the case of conversion ratio, newly-generated SO3Amount is relatively big, can cause new
Pollute.
Summary of the invention
For solving above-mentioned technical problem, it is an object of the invention to provide a kind of sintering machine partial fume denitrating system and side
Method.Denitrating system and the method for the present invention can be real in the case of compared with low fuel and energy resource consumption, relatively low operating cost
The now nitrogen oxides qualified discharge in sintering flue gas.
For reaching above-mentioned purpose, the present invention provides a kind of sintering machine partial fume denitrating system, and it at least includes: dedusting
Device, main exhauster of sintering, desulfurizer, desulfurization air-introduced machine, heat riser, denitrification apparatus, denitration air-introduced machine, no
Denitration flue and chimney；
Wherein, the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, described deduster
Outlet be connected and be provided with on this pipeline main exhauster of sintering by the entrance of pipeline with described desulfurizer, described de-
The outlet of sulphur device by pipeline and threeway be connected to described in not one end of denitration flue and described heat riser
Entrance, and described desulfurization air-introduced machine is disposed in proximity on the pipeline of described desulfurizer entrance or fills near described desulfurization
Putting on the pipeline of outlet, the outlet of described heat riser is connected by the entrance of pipeline with described denitrification apparatus, described de-
The outlet of nitre device is connected to described chimney, at this with the other end of described not denitration flue together with pipeline and threeway
Before three-way converging, the pipeline near described denitration outlet is provided with described denitration air-introduced machine；
Or, the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, described deduster
Outlet by pipeline and threeway be connected to described in not one end of denitration flue and the entrance of described heat riser, and
On the pipeline of described house outlet, it is provided with described main exhauster of sintering, described heat riser before this distributing T-pipe
Outlet be connected by the entrance of pipeline with described denitrification apparatus, the outlet of described denitrification apparatus and described not denitration flue
The other end be connected to the entrance of described desulfurizer together with threeway by pipeline, and near institute before this three-way converging
The pipeline stating denitration outlet is provided with described denitration air-introduced machine, and the outlet of described desulfurizer is connected to by pipeline
Described chimney, and described desulfurization air-introduced machine is disposed adjacent on the pipeline of described desulfurizer entrance or close described desulfurization
On the pipeline of device outlet.In the present invention, not the taking off of denitrification apparatus and supporting heat riser etc. thereof and the present invention
After or before smoke of gunpowder road can be wholy set in desulfurizer.
In above-mentioned system, it is preferable that described heat riser include combustion furnace (or burner), electric heater and
The combination of one or more in heat exchanger etc..Between this heat riser can also be able to be taked in the way of taking direct heat transfer
The mode connecing heat exchange heats up.
Detailed description of the invention according to the present invention, it is preferable that when said system uses denitrification apparatus after desulfurizer
Scheme time, said system also includes that heat-exchanger rig, described heat-exchanger rig are arranged at the inlet duct of described heat riser
With on the outlet conduit of described denitrification apparatus, it is used for being prepared to enter into the flue gas after desulfurization of heat riser and filling from denitration
After putting the denitration of discharge, flue gas carries out heat exchange, and after using heat-exchanger rig can make denitration, the waste heat of flue gas obtains abundant profit
With, after can effectively alleviating desulfurization, low-temperature flue gas is to flue and the corrosion of chimney, promotes atmosphere hoist height simultaneously, subtracts
Few impact on regional environmental quality.The mixed flue gas temperature that the flue gas of the higher temperature after denitration can also will finally discharge
Degree raise, its waste heat thus obtain further with.So when using low-temperature SCR to carry out denitration, it is not necessary in employing
When stating heat-exchanger rig, it is also possible to reach effectively to alleviate low-temperature flue gas after desulfurization to effects such as the corrosion of flue and chimney.
In above-mentioned system, it is preferable that described desulfurizer is wet method, semidry method or dry desulfurization device.
In above-mentioned system, it is preferable that described denitrification apparatus is low temperature SCR denitration device or middling temperature DeNOx
Device.This denitrification apparatus can be the low temperature SCR denitration device not yet having ripe application at present, it is also possible to for electric power
The middling temperature DeNOx device that industry is conventional, it includes supporting reducing agent system, control system etc..In the present invention
A detailed description of the invention in, catalyst in denitrification apparatus uses three layers of middle temperature of honeycomb type or low-temperature SCR catalyst,
Catalyst module size uses 1910 × 970 × 1015mm, and catalyst percent opening is more than 72%, and reducing agent uses liquid
Ammonia.When using Medium temperature SCR, the flue-gas temperature of denitration outlet is higher, can set up heat-exchanger rig and intensification
The flue gas of device portal carries out heat exchange.Additionally, when using Medium temperature SCR, (arrange de-without the flue gas of desulfurization
Sulphur device bypasses, and this bypass can initiate after being arranged at main exhauster of sintering, terminates being arranged at connecting not denitration flue
Before threeway with heat riser inlet duct) denitrification apparatus can also be directly entered.
In above-mentioned system, it is preferable that described not denitration flue is provided with throttling arrangement.
In above-mentioned system, desulfurization air-introduced machine can have various ways, such as desulfurization to draw with desulfurizer relative to position
Blower fan can be arranged on desulfurizer front of or behind, it is also possible to merge setting with main exhauster of sintering.
Detailed description of the invention according to the present invention, it is preferable that said system also includes deduster (only semidry method after desulfurization
Desulfurizer configures deduster after this desulfurization), after described desulfurization, deduster is disposed in proximity to the outlet of described desulfurizer
Pipeline on (and before being positioned at desulfurization air-introduced machine), be used for the flue gas after desulfurization is carried out further dedusting.
The present invention also provides for a kind of sintering machine partial fume denitrating method, and it is to use above-mentioned sintering machine partial fume to take off
Nitre system carries out the method for denitration, and the method comprises the following steps:
Draw at main exhauster of sintering (main exhauster of sintering plays and overcomes the effect of sintering machine and dust remover resistance) and desulfurization
Under the effect of blower fan (desulfurization air-introduced machine plays the effect overcoming desulfurization resistance), make the fume emission mouth of sintering device handpiece
After the sintering flue gas removing dust device discharged carries out dedusting, enter desulfurizer and carry out desulfurization, in flue gas after desulfurization
Be partially into not denitration flue, the another part in flue gas after desulfurization under the effect of denitration air-introduced machine through heat riser
After heating up, enter denitrification apparatus and carry out denitration, then mix with the flue gas after the desulfurization of not denitration flue,
After mixing, flue gas is through smoke stack emission；
Or, under the effect of main exhauster of sintering, make the sintering flue gas warp that the fume emission mouth of sintering device handpiece is discharged
After deduster carries out dedusting, the flue gas after dedusting is partly into not denitration flue, another in the flue gas after dedusting
A part after heat riser heats up, enters denitrification apparatus and carries out denitration, then under the effect of denitration air-introduced machine
Mixing with the flue gas after the dedusting of not denitration flue, mixed flue gas enters de-under the effect of desulfurization air-introduced machine
Sulphur device carries out desulfurization, and the flue gas after desulfurization is through smoke stack emission.
In the methods described above, when using the technological process of denitration after first desulfurization, sintering flue gas can first pass through dedusting
Device and desulfurizer, make the dust in flue gas and sulfur dioxide concentration reach Standard.Can make through desulfurizer
Sulfur dioxide concentration in flue gas is greatly reduced, and is such as down to 100mg/Nm3Below.
In the methods described above, it is preferable that the method for described desulfurization can use the wet method of routine, dry method or half-dried
Method etc..
In the methods described above, when using the technological process of denitration after first desulfurization, the flue-gas temperature after desulfurization is relatively low,
Do not reach SCR denitration temperature requirement, use heat riser that flue gas carries out intensification and can meet the temperature of SCR denitration
Requirement.When using the technological process of desulfurization after first denitration, still need to heat riser and flue gas is heated up.The mesh heated up
Mark temperature is arranged according to denitration reaction requirement.280-420 DEG C then it is warmed up to, if adopting according to middling temperature DeNOx
150-200 DEG C then it is warmed up to low temperature SCR denitration.
In the methods described above, it is preferable that the denitration carried out in denitrification apparatus uses low-temperature selective catalytic reduction method
Or middle temperature selective catalytic reduction method is carried out.
In the methods described above, it is preferable that the denitration efficiency in described denitrification apparatus is 60%-90% or higher.Should
Denitration efficiency refers to the clearance of NOx in flue gas.This denitration efficiency can pass through reducing agent dosage and beds
Number etc. is adjusted, and the setting value of this efficiency depends on carrying out the exhaust gas volumn of denitration and accounts for the factor such as ratio of total exhaust gas volumn,
NO after finally the flue gas after guarantee denitration mixes with the flue gas of not denitration fluexEmission compliance.
In the methods described above, it is preferable that the exhaust gas volumn entering not denitration flue enters denitration dress with through heat riser
The ratio of the exhaust gas volumn put is dense by the nitrogen oxides in effluent of the nitrogen oxides in effluent concentration of pending process, discharge
Denitration efficiency in degree, denitrification apparatus combines decision, to ensure the NO in the final flue gas dischargedxUp to standard, and lead to
Cross the throttling arrangement on not denitration flue and/or the regulation of denitration air-introduced machine.When discharge standard tends to strict, can subtract
The exhaust gas volumn entering not denitration flue less is adjusted.It is said that in general, the exhaust gas volumn entering not denitration flue can be
Exhaust gas volumn (technique of desulfurization after first denitration) after flue gas after desulfurization amount (technique of denitration after first desulfurization) or dedusting
30%-100% (percent by volume).
Detailed description of the invention according to the present invention, it is preferable that when deduster after the system of the present invention includes desulfurization, on
State method further comprising the steps of: after the flue gas entrance desulfurization after desulfurization, deduster is further separated into not taking off after carrying out dedusting again
Smoke of gunpowder road and heat riser or through smoke stack emission.
Sintering machine partial fume denitrating system and the method for the present invention mainly has the advantage that (1), only processes part
Flue gas, the flue gas that after making denitration, temperature the is higher flue gas relatively low with the temperature of non-denitration mixes, and obtains temperature of a relatively high
Mixed flue gas, it is possible to the problem effectively alleviating the low-temperature flue gas corrosion chimney brought because of desulfurization, be conducive to promoting simultaneously
Smoke evacuation rising height, the reduction pollutant impact on surrounding enviroment of amplitude peak；(2), the NO in ensureing flue gasx
On the premise of emission compliance, only to partial fume denitrating, compared to whole denitrating flue gas, the fuel heated up for flue gas
And/or energy resource consumption can be greatly reduced, and processing cost also declines to a great extent.In a word, the sintering of the present invention is used
Machine partial fume denitrating system and method are sintered denitrating flue gas, it is possible to compared with low fuel and energy resource consumption, relatively low fortune
The denitration efficiency of denitration partial fume can be made to reach 60%-90% in the case of row expense the highest, make finally to discharge
Flue gas meet up-to-date Standard, it is achieved nitrogen oxides qualified discharge, and there is a capability meet tightened up row
Put requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of the sintering machine partial fume denitrating system of the embodiment of the invention.
Fig. 2 is the structural representation of the sintering machine partial fume denitrating system of embodiment 1.
Fig. 3 is the structural representation of the sintering machine partial fume denitrating system of embodiment 2.
Primary clustering symbol description:
Deduster 1 desulfurizer 2 desulfurization air-introduced machine 3
Heat riser 4 denitrification apparatus 5 denitration air-introduced machine 6 not denitration flue 7 chimney 8
Deduster 11 heat-exchanger rig 12 after sintering machine 9 main exhauster of sintering 10 desulfurization
Detailed description of the invention
In order to the technical characteristic of the present invention, purpose and beneficial effect are more clearly understood from, the existing skill to the present invention
Art scheme carries out described further below, but it is not intended that to the present invention can the restriction of practical range.
In a detailed description of the invention of the present invention, as it is shown in figure 1, the sintering machine partial fume denitrating system of the present invention
At least include: deduster 1, main exhauster of sintering 10, desulfurizer 2, desulfurization air-introduced machine 3, heat riser 4,
Denitrification apparatus 5, denitration air-introduced machine 6, not denitration flue 7 and chimney 8；Wherein, the entrance of described deduster 1
Being connected by the fume emission mouth of pipeline with sintering machine 9 head, the outlet of described deduster 1 is de-with described by pipeline
The entrance of sulphur device 2 connects and is provided with main exhauster of sintering 10 on this pipeline, and the outlet of described desulfurizer 2 is led to
Piping and threeway be connected to described in not one end of denitration flue 7 and the entrance of described heat riser 4, this three
Before reduction of fractions to a common denominator stream, the pipeline near the outlet of described desulfurizer 2 is provided with described desulfurization air-introduced machine 3, described heat riser 4
Outlet be connected by the entrance of pipeline with described denitrification apparatus 5, the outlet of described denitrification apparatus 5 and described not denitration
The other end of flue 7 is connected to described chimney 8 by pipeline together with threeway, near described de-before this three-way converging
The pipeline of nitre device 5 outlet is provided with described denitration air-introduced machine 6.
In a detailed description of the invention of the present invention, the sintering machine partial fume denitrating method of the present invention includes following step
Rapid: under the effect of main exhauster of sintering 10 and desulfurization air-introduced machine 3, make the fume emission mouth of sintering machine 9 head arrange
After the sintering flue gas removing dust device 1 gone out carries out dedusting, enter desulfurizer 2 and carry out desulfurization, in the flue gas after desulfurization
Be partly into not denitration flue 7, the another part in flue gas after desulfurization under the effect of denitration air-introduced machine 6 through rise
Temperature is after device 4 heats up, and enters denitrification apparatus 5 and carries out denitration, then with after the desulfurization of not denitration flue 7
Flue gas mixing, mixed flue gas discharges through chimney 8.
Below by way of specific embodiment, technical scheme is described in detail.
Embodiment 1
The present embodiment provides a kind of sintering machine partial fume denitrating system, as in figure 2 it is shown, comprising: deduster 1,
Desulfurizer 2, desulfurization air-introduced machine 3, heat riser 4, denitrification apparatus 5, denitration air-introduced machine 6, not denitration flue 7,
Deduster 11 after chimney 8, main exhauster of sintering 10 and desulfurization；
Wherein, the entrance of described deduster 1 is connected with the fume emission mouth of sintering machine 9 head by pipeline, described removes
The outlet of dirt device 1 is connected with the entrance of described desulfurizer 2 by pipeline and is provided with described sintering master on this pipeline takes out
Blower fan 10, the outlet of described desulfurizer 2 is connected with the entrance of deduster 11 after described desulfurization by pipeline, described
After desulfurization the outlet of deduster 11 by pipeline and threeway be connected to described in not one end of denitration flue 7 and described
The entrance of heat riser 4, is provided with institute on the pipeline of deduster 11 outlet before this distributing T-pipe after described desulfurization
Stating desulfurization air-introduced machine 3, the outlet of described heat riser 4 is connected by the entrance of pipeline with described denitrification apparatus 5, institute
The other end of the outlet and described not denitration flue 7 of stating denitrification apparatus 5 is connected to described cigarette together with pipeline and threeway
Chimney 8, is provided with described denitration air-introduced machine 6 before this three-way converging on the pipeline of described denitrification apparatus 5 outlet；
Described deduster 1 is electric cleaner；Described desulfurizer 2 is the semi-dry flue gas desulfurization device that this area is conventional；
After described desulfurization, deduster 11 is the sack cleaner that semi-dry flue gas desulfurization device is supporting；Described heat riser 4 is
Coke oven gas burner；Described denitrification apparatus 5 uses low temperature SCR denitration reactor, at this SCR denitration reactor
In, catalyst uses three layers of honeycomb type low-temperature SCR catalyst, and catalyst module size uses 1910 × 970 × 1015
(mm), catalyst percent opening is more than 72%, and denitration efficiency controls more than 80%, and reducing agent uses liquefied ammonia.
Use the sintering machine partial fume denitrating system of the present embodiment to the flue gas (operating mode from 200 square metres of sintering machines
Flow 1,220,000 m3/ h) carry out denitration, it comprises the following steps:
Under the effect of main exhauster of sintering 10 and desulfurization air-introduced machine 3, the fume emission mouth of sintering machine 9 head is made to arrange
After the sintering flue gas removing dust device 1 gone out carries out dedusting, enter desulfurizer 2 and carry out desulfurization, then dedusting after desulfurization
Device 11 carries out dedusting again, obtains the flue gas after desulfurization, and the exhaust gas volumn after this desulfurization is about 1,050,000 m3/ h, temperature
It is 80 DEG C, SO2Concentration is 100mg/Nm3, NOxConcentration is 400mg/Nm3, make 70 in the flue gas after desulfurization
Ten thousand m3/ h enters not denitration flue 7, makes 350,000 m in the flue gas after desulfurization3/ h is under the effect of denitration air-introduced machine 6
After heat riser 4 is warming up to 180 DEG C, entering denitrification apparatus 5 and carry out denitration, denitration resistance is by denitration air-introduced machine 6
Overcome, control denitration efficiency 80%, flue gas NO after denitrationxConcentration is 80mg/Nm3, temperature is 160 DEG C, then
Make the flue gas after denitration and 700,000 m through not denitration flue 73Flue gas mixing after/h desulfurization, mixed flue gas
NOxConcentration is 293mg/Nm3, temperature is 107 DEG C, discharges through chimney 8.
Embodiment 2
The present embodiment provides a kind of sintering machine partial fume denitrating system, as it is shown on figure 3, comprising: deduster 1,
Desulfurizer 2, desulfurization air-introduced machine 3, heat riser 4, denitrification apparatus 5, denitration air-introduced machine 6, not denitration flue 7,
Chimney 8, main exhauster of sintering 10 and heat-exchanger rig 12；
Wherein, the entrance of described deduster 1 is connected with the fume emission mouth of sintering machine 9 head by pipeline, described removes
The outlet of dirt device 1 is connected with the entrance of described desulfurizer 2 by pipeline and is provided with described sintering master on this pipeline takes out
Blower fan 10, described desulfurizer 2 outlet by pipeline and threeway be connected to described in not denitration flue 7 one
End and the entrance of described heat riser 4, be provided with before this distributing T-pipe on the pipeline of described desulfurizer 2 outlet
Described desulfurization air-introduced machine 3, the outlet of described heat riser 4 is connected by the entrance of pipeline with described denitrification apparatus 5,
Described heat-exchanger rig 12 is arranged on the inlet duct of described heat riser and the outlet conduit of described denitrification apparatus, uses
To be prepared to enter into heat riser flue gas after desulfurization and from denitrification apparatus discharge denitration after flue gas carry out heat exchange, institute
State the outlet (after being connected to described heat-exchanger rig 12 by pipeline) of denitrification apparatus 5 and described not denitration flue 7
The other end is connected to described chimney 8, before this three-way converging and after heat-exchanger rig 12 by pipeline together with threeway
The pipeline in face is provided with described denitration air-introduced machine 6；
Described deduster 1 is electric cleaner；Described desulfurizer 2 is the wet flue gas desulfurizer that this area is conventional；
Described heat riser 4 is blast furnace gas burner；Described denitrification apparatus 5 uses the SCR denitration that power industry is conventional
Reactor, in this SCR denitration reactor, catalyst uses three layers of honeycomb type Medium temperature SCR catalyst, catalyst
Module size uses 1910 × 970 × 1015 (mm), and catalyst percent opening is more than 72%, and denitration efficiency controls
More than 90%, reducing agent uses liquefied ammonia.
Use the sintering machine partial fume denitrating system of the present embodiment to the flue gas (operating mode from 360 square metres of sintering machines
Flow 2,210,000 m3/ h) carry out denitration, it comprises the following steps:
Under the effect of main exhauster of sintering 10 and desulfurization air-introduced machine 3, the fume emission mouth of sintering machine 9 head is made to arrange
After the sintering flue gas removing dust device 1 gone out carries out dedusting, entering desulfurizer 2 and carry out desulfurization, the exhaust gas volumn after desulfurization is about
1780000 m3/ h, temperature is 55 DEG C, SO2Concentration is 100mg/Nm3, NOxConcentration is 450mg/Nm3, make to take off
1,120,000 m in flue gas after sulphur3/ h enters not denitration flue 7, makes 660,000 m in the flue gas after desulfurization3/ h is de-
The lower first flue gas heat exchange after heat-exchanger rig 12 with the denitration of denitrification apparatus 5 outlet of effect of nitre air-introduced machine 6 is extremely
150 DEG C, then after heat riser 4 is warming up to 280 DEG C, enters denitrification apparatus 5 and carry out denitration, denitration resistance is by taking off
Nitre air-introduced machine 6 overcomes, and controls denitration efficiency 90%, flue gas NO after denitrationxConcentration is 45mg/Nm3, after denitration
Flue gas temperature after heat-exchanger rig 12 heat exchange is down to 160 DEG C, then makes the flue gas after denitration heat exchange cooling and process
Not 1,120,000 m of denitration flue 73Flue gas mixing after/h desulfurization, mixed flue gas NOxConcentration is 299mg/Nm3,
Temperature is 94 DEG C, discharges through chimney 8.
Embodiment 1 and the sintering machine partial fume denitrating system of embodiment 2 and method only process partial fume, can make
Obtain whole fume emissions up to standard, and partial fume processing cost whole fume treatment expense declines to a great extent, such as embodiment
In 1, flue gas after desulfurization amount is 1,050,000 m3/ h, denitrating system and method by embodiment 1 only process 350,000 m3/h
Can be up to standard, processing cost have dropped about 60%.And after denitration, the waste heat of flue gas can obtain fully in embodiment 2
Utilizing, after denitration, flue gas first carries out heat exchange with flue gas after desulfurization, and then its waste heat is by non-denitration flue gas to 94 DEG C,
After can effectively alleviating desulfurization, low-temperature flue gas is to flue and the corrosion of chimney, promotes atmosphere hoist height simultaneously, and it is right to reduce
The impact of regional environmental quality.
Claims (1)
1. a sintering machine partial fume denitrating method, its sintering machine partial fume denitrating system used at least includes:
Deduster, main exhauster of sintering, desulfurizer, desulfurization air-introduced machine, heat riser, denitrification apparatus, denitration air-introduced machine,
Not denitration flue and chimney；
Scheme one: the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, described dedusting
The outlet of device is connected by the entrance of pipeline with described desulfurizer and is provided with main exhauster of sintering on this pipeline, described
The outlet of desulfurizer by pipeline and threeway be connected to described in not one end of denitration flue and described heat riser
Entrance, described not denitration flue is provided with throttling arrangement, and described desulfurization air-introduced machine is disposed in proximity to described desulfurization
On the pipeline of device portal or near described desulfurizer outlet pipeline on, pipeline is passed through in the outlet of described heat riser
Being connected with the entrance of described denitrification apparatus, the outlet of described denitrification apparatus and the other end of described not denitration flue are by pipe
Road is connected to described chimney together with threeway, and sets on the pipeline of described denitration outlet before this three-way converging
There is described denitration air-introduced machine；Described not denitration flue is provided with throttling arrangement；
Scheme two: the entrance of described deduster is connected with the fume emission mouth of sintering device handpiece by pipeline, described dedusting
The outlet of device by pipeline and threeway be connected to described in not one end of denitration flue and the entrance of described heat riser,
And before this distributing T-pipe, on the pipeline of described house outlet, it being provided with described main exhauster of sintering, described intensification fills
The outlet put is connected by the entrance of pipeline with described denitrification apparatus, the outlet of described denitrification apparatus and described not denitration cigarette
The other end in road is connected to the entrance of described desulfurizer by pipeline together with threeway, and close before this three-way converging
The pipeline of described denitration outlet is provided with described denitration air-introduced machine, and the outlet of described desulfurizer is connected by pipeline
In described chimney, and described desulfurization air-introduced machine is disposed adjacent on the pipeline of described desulfurizer entrance or takes off near described
On the pipeline of sulphur device outlet；Described not denitration flue is provided with throttling arrangement；
Wherein, described heat riser is combustion furnace, electric heater or heat exchanger；Described desulfurizer is wet method, half-dried
Method or dry desulfurization device；Described denitrification apparatus is low temperature SCR denitration device or middling temperature DeNOx device；
When described desulfurizer is semidry method or desulfurizer, described system also includes deduster after desulfurization, described de-
After sulphur on the pipeline of the outlet that deduster is disposed in proximity to described desulfurizer, it is used for the flue gas after desulfurization is entered one
Step dedusting；
When described system uses described scheme one and described denitrification apparatus to be middling temperature DeNOx device, described system
System also includes that heat-exchanger rig, described heat-exchanger rig are arranged at the inlet duct of described heat riser and described denitrification apparatus
On outlet conduit, be used for be prepared to enter into heat riser flue gas after desulfurization and from denitrification apparatus discharge denitration after cigarette
Gas carries out heat exchange；
The method comprises the following steps:
Scheme one: under the effect of main exhauster of sintering and desulfurization air-introduced machine, makes the fume emission mouth of sintering device handpiece arrange
After the sintering flue gas removing dust device gone out carries out dedusting, enter desulfurizer and carry out desulfurization, in the flue gas after desulfurization
Dividing and enter not denitration flue, the another part in flue gas after desulfurization enters through heat riser under the effect of denitration air-introduced machine
After row heats up, enter denitrification apparatus and carry out denitration, then mix with the flue gas after the desulfurization of not denitration flue, mixed
Flue gas after conjunction is through smoke stack emission；
Scheme two: under the effect of main exhauster of sintering, makes the sintering flue gas that the fume emission mouth of sintering device handpiece is discharged
After removing dust device carries out dedusting, the flue gas after dedusting is partly into not denitration flue, in the flue gas after dedusting
Another part after heat riser heats up, enters denitrification apparatus and carries out denitration, so under the effect of denitration air-introduced machine
Mixing with the flue gas after the dedusting of not denitration flue afterwards, mixed flue gas enters under the effect of desulfurization air-introduced machine
Desulfurizer carries out desulfurization, and the flue gas after desulfurization is through smoke stack emission；
Wherein, the denitration carried out in denitrification apparatus uses low-temperature selective catalytic reduction method or the catalysis of middle temperature selective also
Former method is carried out；Denitration efficiency in described denitrification apparatus is 60%-90%；The exhaust gas volumn entering not denitration flue is passed through
The throttling arrangement on denitration flue and/or denitration air-introduced machine do not regulate, and this exhaust gas volumn is flue gas after desulfurization amount or removes
The 30%-100% of the volume of exhaust gas volumn after dirt.
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| CN104607015A (en) * | 2015-02-15 | 2015-05-13 | 中冶赛迪工程技术股份有限公司 | Multi-pollutant co-purification method and multi-pollutant co-purification system for sintering flue gas |
| CN105194990A (en) * | 2015-10-14 | 2015-12-30 | 中国华能集团清洁能源技术研究院有限公司 | Flue gas comprehensive management system applicable to coke refining oven |
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| CN107983155A (en) * | 2017-12-26 | 2018-05-04 | 中冶京诚工程技术有限公司 | One kind sintering denitrating flue gas desulphurization system and its application |
| CN109745855B (en) * | 2018-12-29 | 2021-11-05 | 安徽工业大学 | Sintering flue gas SOX、NOXCombined emission reduction system |
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| CN117085504B (en) * | 2023-10-20 | 2023-12-29 | 中太海碳(上海)环保科技有限公司 | Marine desulfurization and decarbonization integrated absorption reaction tower |
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