CN100560187C - Be used at catalysis system furnace reduction SO 3Method - Google Patents

Be used at catalysis system furnace reduction SO 3Method Download PDF

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Publication number
CN100560187C
CN100560187C CNB2005800112222A CN200580011222A CN100560187C CN 100560187 C CN100560187 C CN 100560187C CN B2005800112222 A CNB2005800112222 A CN B2005800112222A CN 200580011222 A CN200580011222 A CN 200580011222A CN 100560187 C CN100560187 C CN 100560187C
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classification
fuel
combustion
microcosmic
flue gas
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CN1942233A (en
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布赖恩·S·希金斯
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HUAXI ENERGY INDUSTRY GROUP Co Ltd
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Brian S Higgins
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    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The present invention relates to a kind ofly control SO using sulfurous fuels to utilize in the combustion process of SCR 3The method of flue gas concentration, described method step comprises: the combustion system that a use low-NOx combustor and SCR are provided; The described fuel of partial combustion is to produce reducing environment in the phase I; Make described reducing environment keep a grace time section so that with SO 3Be reduced to SO 2Thereby obtain the SO of aspiration level 3In second stage with oxidation environment burning residual fuel and burning intermediate; Reduce remaining NOx with SCR; Reduce emission NOx thus.

Description

Be used at catalysis system furnace reduction SO 3Method
Technical field
The present invention relates to a kind of method that is used to reduce from the byproduct emission of combustion reaction in general, and more specifically relates to and a kind ofly regulate burning inner flue gas of the stove SO with catalyst 3Method.
Background technology
Acidity reduces
People think that always the flue gas in power plant is a kind of source of atmospheric pollution for a long time.In the burning of fossil fuel, the oxidized formation of some naturally occurring element (for example) SO 3, NOx, HCl, HF and like that.(the SO especially if these acid 3) concentration surpassed some critical value then it may have problems.For example, work as SO 3When concentration raise, the acid dew-point temperature of flue gas can raise.If the temperature of flue gas is lower than the acid dew-point temperature of flue gas, the then SO in the gas 3Form H with condensing and reacting with water 2SO 4, cause stove internal corrosion problem.And, from the flue gas that burner hearth leaves can cool off rapidly and described gas in SO 3And other sour condensing, (it is SO to form local acid rain 3And other sour coagulation and landing thing) fall on every side on the ground, have subsequent corrosion.Too much SO 3Can condense into droplet, and form visible plume when leaving burner hearth, this can cause aesthetic problem and local political issue.If have the NH of being similar in the described flue gas 3Compound, then these compounds may with SO 3React and form ammonium hydrogen sulfate (NH 3HSO 4), it subsequently can the contaminated air heater.
Therefore, there are following needs: reduce the flue gas acid dew point temperature so that acid dew-point temperature is lower than the flue-gas temperature in the coldest part of burner hearth (for example carrier pipe and chimney).Also there are another needs: reduce the acid content of flue gas so that minimize local acid rain and the other problem relevant with the peracidity flue gas.
SO 3 Increase
The particulate matter that is loaded with in the flue gas can be removed by electrostatic precipitator, electrostatic precipitator can make described individual particle accept an electric charge and utilize this electric charge that they are attracted to collecting board subsequently and implement the cleaning.The efficient of these electrostatic precipitator depends on that described individual particle obtains the ability of electric charge, that is, and and the resistivity of described particle.Have been found that and have SO in the flue gas 3Can effectively reduce the resistivity of described particle, it is charged that it is easier to electrostatic means.
In coal combustion, some naturally occurring sulphur is converted into SO 3On the other hand, SO 3The validity that reduces described particulate matter resistivity depends on SO 3Concentration, wherein about 15 to 2,000 ten thousand umbers (ppm) can obtain optimum.Therefore, dust collector efficiency is regulated SO in the flue gas 3The quantity sulfur content of institute's coal combustion (no matter how) is Zong so that SO 3Concentration is in the influence of the ability in the optimum range.
SO 3Also be in SCR (catalyst) device, to pass through SO 2Oxidation produce, and surpass best 15 to 20ppm optium concentration through regular meeting.In SCR, be generally used for NOx is reduced to N 2The catalyst admixture of (in the presence of ammonia) also can be with SO 2Be oxidized to SO 3The speed of this reaction has strong temperature dependency, and under higher temperature, can be with 1% SO 2Change into SO 3High sulfur-bearing U.S. coal any position in boiler all can produce from 2,000 to 3 the SO of 000ppm 2, and therefore can produce 20 to 30ppm SO in the SCR outside 3The SO that problem is, similar 50% (or 10 to 15ppm) comes out from described SCR 3Can discharge chimney by cleaner.About 8 to 10ppm the time (depending on granule density), SO 3Become a visible blue plume.
And, SO 3Can also catalytic way in other boiler surfaces via interacting with element/chemicals (for example vanadium) and producing.
Therefore, because all SO that before SCR, form 3Can be added into the SO of discharge 3In, so reduce the SO that before SCR, forms 3For reducing the SO that discharges 3Be important and allow and use SCR to reduce the NOx of gas and can not produce excessive SO 3
SO 3 Control
If SO 3Concentration is too low, and then deduster will be to be lower than best efficient work.On the other hand, if SO 3Concentration is too high, and then flue gas can become peracidity, produces " blue smoke " and promotes to form acid rain.In addition, acidic flue gas can promote the corrosion to the transmission flue, and works as and NH 3The type chemicals in conjunction with the time can block air heater.
And SCR common every year, only desire was used six months (in summer ozone control season), then had been left in the basket in winter.This situation in deduster, in pipeline, and can cause SO in exhaust chimney outside 3The seasonal variations of concentration.
Therefore people expect whether dependence uses SCR to control SO in the flue gas 3Concentration.SO near 40ppm 3Concentration can cause the sour problem in serious disadvantageous part, though not necessarily adjusted, can cause the local political issue of facility.U.S.EPA points out that expectation is in the future to SO 3Discharging manage.
Therefore, people expectation has and a kind ofly can regulate SO in the flue gas under the situation of using or do not use SCR 3The SO of concentration 3Flue gas system is with SO 3Thereby concentration maintains optimum level reaches high ESP usefulness, and does not increase local SO 3Discharging.
Classification
The burning classification is with two or the process of more a plurality of stage calcinating fuel (being coal).The rich fuel stage (or briefly, enrichment stage) is available air inadequate stage for the described fuel of completing combustion wherein.The poor fuel stage is one wherein to have for the described fuel of completing combustion fully or stage of excess air.Classification is used to pass through a) to reduce peak temperature (heating power type NOx) in the prior art and b) provides a reducing environment to come reducing NOx (NOx reduction).Macroscopical classification is that each section of burner hearth is divided into the enrichment stage with the poor stage and by using these for example after-flame wind technology such as (OFA) realizations.The microcosmic classification promptly produces and has the different functionalities feature the nearly micro of (for example reduction potential, temperature, and like that).For example, the microcosmic classification in the burner hearth can be in the phase I of described burner hearth by using low-NOx combustor and regulating the rotary blade setting value and air register is reached.The classification that increases can be increased in the time of staying in the reducing atmosphere and can strengthen the effect of described reducing atmosphere.
Prior art has adopted the microcosmic classification to reduce the discharging of NOx in the combustion furnace.Low-NOx combustor (LNB) is delivered in the burner hearth by a wind with high fuel content and mixes to come classification with the secondary wind facies that flows through one or more secondary air register.LNB mainly uses the microcosmic classification.Flow by a LNB is designed to make the volatile components of coal to mix with available near zone air with the stoichiometric proportion near (1.0).Near the clean burning in the central core of burner be generally enriched fuel and can not produce a large amount of hot NOx because temperature is very low.When increasing air was mixed in described central core lentamente, coal finally exhausted through furnace depth.Most of NOx of this region generating is NO from fuel-bound nitrogen and via intermediate HCN reaction.The speed that outside secondary wind is mixed in the core air-flow is set by the rotary blade in damper and rotary blade and the coal pipeline.Have a combustion product that enriches and the continuous mixing of secondary wind owing to spread all over the combustion zone, the LNB system reduces NOx by classification.Blending ratio increases between abundant core air-flow and the outside secondary general mood stream by reducing in classification.
Prior art has adopted macroscopical classification to reduce discharging in the combustion furnace.The macroscopic view classification is made up of the fuel and the air that highly mix in the low burner hearth, is mixed to one and is lower than one stoichiometric proportion for most of air-flow.Final still need excessive oxygen to guarantee that all fuel have burnt and reduce the danger of exploding.In the burner hearth of macroscopical classification, excess air is introduced the downstream of burner.The classification that increases is reached by the quality that increases the time of staying, temperature or reduce combustion product under the situation that lacks oxygen.
The NOx that prior art uses microcosmic classification (LNB) and macroscopical classification (OFA) dual mode to reduce in the combustion furnace discharges.Under microcosmic classification and both situations of macroscopical classification, use each above-mentioned combination and adjusted to reach the reduction of NOx emission.
Never teaching is crossed the SO that classification is used for the reduction of flue gas acidity, acid dew-point temperature control or burning gases in the prior art 3Concentration control.
Summary of the invention
The present invention relates in a combustion process, utilize SCR to use sulfurous fuels control SO 3In the method for flue gas concentration, classification is used for the reduction of flue gas acidity, acid dew-point temperature control, SO 3Concentration control or above-mentioned combination.
Therefore, one aspect of the present invention is for providing one to utilize SCR to use sulfurous fuels control SO in combustion process 3The method of flue gas concentration said method comprising the steps of:
A) provide a combustion system of using low-NOx combustor and SCR
B) in a phase I the described fuel of partial combustion to produce a reducing environment;
C) make described reducing environment keep a grace time section, so that with SO 3Be reduced to SO 2To reach the SO of aspiration level 3
D) in a second stage, use oxidation environment combustion fuel residue and burning intermediate;
E) reduce remaining NOx with SCR;
Reduce emission NOx thus.
The present invention provides one to utilize SCR to use sulfurous fuels control SO in combustion process on the other hand 3The method of flue gas concentration, described method comprises step:
A) provide a combustion furnace that uses low-NOx combustor and SCR
B) in a phase I the described fuel of partial combustion to produce a reducing environment;
C) in a second stage, use oxidation environment combustion fuel residue and burning intermediate;
D) acid dew point of measurement flue gas;
E) in the phase I, reducing environment is regulated so that the acid dew point of flue gas is reduced to an expectation level;
Control the SO of flue gas thus 3Concentration.
Further aspect of the present invention provides a combustion furnace that uses a method that reduces flue gas acidity to operate, and these method steps comprise:
A) provide a combustion system of using low-NOx combustor and SCR
B) in a phase I the described fuel of partial combustion to produce a reducing environment;
C) make described reducing environment keep a grace time section, so that with SO 3Be reduced to SO 2To reach the SO of an expectation level 3
D) in a second stage, use oxidation environment combustion fuel residue and burning intermediate;
E) reduce remaining NOx with SCR;
Go to the SO of the flue gas of described SCR by control 3Thereby level reduces emission NOx.
Industry those skilled in the art are aspect hereinafter will understand that the present invention these and other after the description about preferred embodiment in conjunction with graphic reading in those.
Description of drawings
The specific embodiment
In the explanation, identical conventional letter is all represented identical or corresponding part in some views hereinafter.Equally, in the explanation, should be appreciated that term " forward ", " backward ", " preceding ", " back ", " right side ", " left side ", " making progress ", " downwards " and like that hereinafter all for ease of describing used vocabulary and it should not being interpreted as restricted term.In the present invention, " reducible acid " refer to wherein and can reduce or eliminate acid acid by described acid being carried out electrochemical reduction.
The present invention relates to one uses the burning classification to reduce and control the method for acid dew-point temperature in stove.The invention further relates to one uses the burning classification at furnace reduction and control SO 3Method.The classification that increases is advantageously used in reducing simultaneously acidity, reduces acid dew-point temperature and reduces SO in the flue gas 3Level.
Reduce acidity, acid dew-point temperature and SO via the microcosmic classification 3
With in rich " reduction " environment, NOx is reverted back N 2Method similar, in reducing environment with SO 3Revert back SO 2For macroscopical classification, the burner hearth center that is lower than the OFA mouth is enriched with a large amount of fuel.The environment of this classification can be adjusted into even still less mix to produce the classification of reproducibility microcosmic in the phase I at described burner hearth.Thereby rotary blade speed setting value that can be by reducing wind and coal stream or reduce secondary wind rotary blade and air register in addition or otherwise and set value to reduce to mix and produce the reproducibility microcosmic stage; Can be in addition or otherwise change wind and coal stream and secondary be distinguished and admirable between relative muzzle velocity.
During the fuel-bound combustion of sulfur, though most of fuel-bound sulphur forms SO 2The time, but some directly form SO 3SO 2Can form more SO via following oxidation reaction 3
SO 2+O(+M)→SO 3(+M)
Yet this trisome reaction speed is very slow.In an oxidation environment, produce SO 3Another source be by the reaction:
SO 2+O 2→SO 3+O。
This reaction does not need three entities to contact simultaneously; Yet it is very responsive to temperature, need high temperature, and it is easy to take place back reaction:
SO 3+O→SO 2+O 2。
In a reducing environment, owing to lack O and O 2Material, above-mentioned three kinds of reactions are neither to be taken place with any remarkable quantity.In a reducing environment, SO 3To SO 2Directly transform by following general " reduction " reaction and take place.
SO 3+R→SO 2+RO，
Wherein R is any reduction group class.In fossil-fuel-fired, main group is the H group.
SO 3+H→SO 2+OH
In reducing environment, many groups and molecule can be functional; For example H, OH, C, CO, CH, CH 2C 2H, CH 3, C nH m, N, NH i, and many other groups and molecule.
When the reduction group of valid density (" R "), above-mentioned SO 3Reduction reaction speed is exceedingly fast.In stage, sufficient concentration mainly appears in the reducing environment at first (rich fuel) of described burner hearth.
In a rich fuel staging reducing environment, (for example OH, O, O because the oxidisability combustible substance 2, HO 2, H 2O 2And other this type of material) concentration reduces greatly, so the oxidation chemistry process stops.In this environment, for all can utilize oxygen species, each material was that very tool is emulative.With the molecule that relatively exists than small concentration with oxygen atom by the aerobic material consumption that exists with high concentration; For example, the oxygen among the NO is by other material consumption such as C, CO, H and CH.Molecule with a plurality of oxygen atoms especially faces a danger; That is SO, 3To change into SO rapidly via any group around almost (the most remarkable be H atom) removal oxygen 2
Therefore, in reducing environment, when keeping described reducing environment, SO 3Reduction reaction is very fast and in fact irreversible.
Wonderful and importantly, for the inventive method and system, the SO of net effect in the phase I, during burning, forming 3Be reduced to SO rapidly 2, and by being oxidized to SO 2And can not regenerate SO 3, because in burner hearth, do not have the sufficient time of staying in the stage under the sufficiently high temperature at poor fuel afterwards.Therefore, the present invention can utilize reaction rate difference to reduce easily and keep SO in the flue gas 3Level.
The reduction potential that the classification that increases can be increased in the time of staying in the reducing atmosphere or increase described atmosphere is to reduce SO 3Concentration also reduces dew-point temperature thus.Therefore, for promoting SO 3Reduction, can increase the time of staying maybe can increase reduction potential in the flue gas.
For increasing the time of staying, can utilize several different methods.
1) can prolong distance between between the stage
2) can increase mixing for macroscopical hierarchical application
3) can reduce mixing for the microcosmic hierarchical application
4) can reduce mass flow (deep layer classification)
5) can increase volume utilization (for example vortex) between the stage
6) can increase pressure
7) can increase density
For increasing the reduction potential in the flue gas, can utilize several different methods.
1) can increase temperature
2) can reduce stoichiometric proportion (that is the ratio of air and fuel).
3) can increase local burnup's stream (for fixing air stream)
4) can reduce local air stream (for fixing fuel stream)
Mixing in the stage also can influence reduction process.One has complete mix stages the best of stoichiometric proportion mixture, and this is because these reaction conditions can reach maximum temperature, still keeps described reducing environment simultaneously; That is, minimize such as oxide groups such as O groups.But, be unpractical owing to mix fully, therefore, in fact use one less than 1 stoichiometric proportion, it can make the appearance that has greater than the position of 1 stoichiometric proportion minimize.Yet, when mixing minimizing, need the longer time of staying and/or higher temperature reach total acidity, acid dew-point temperature and/or SO 3The similar attenuating of concentration.Yet the temperature of burning gases depends on the level of mixing on a certain degree, reduces its reduction if mix.Therefore, if the mixing of a given degree needs a temperature that raises, then must be by the alternate manner temperature that raises, for example air is carried out preheating, changes the heat transfer characteristic, and like that of burner hearth.Perhaps or in addition, can introduce (for example OFA sprays) and increase the time of staying in the described reducing environment by postponing poor stage air.
Note SO 3By in a catalyst to SO 2A catalyst carries out oxidation and forms, because can make SO 2By following reaction oxidation:
SO 2+1/2O 2→SO 3
Only depend on SO owing to described through catalytic reaction 2And O 2Concentration, SO in the catalyst 3Generation be not subjected to SO in the gas 3The restriction of concentration.Therefore, the whole SO that reduce by the present invention 3Can reduce outlet SO independently 3And be not subjected to SO in the catalyst 3The influence of generation and can not influence SO in the catalyst 3Generation.
Therefore, the invention provides just like following method: control also reduces flue gas acidity, flue gas SO especially 3Concentration influences the efficient of electrostatic precipitator to help (1), reaches more preferably, and (2) reduce SO in the flue gas 3And the concentration of other reducible acid to be to reduce flue gas acidity and acid dew point, reduces thus that air heater stops up, air channel burn into and be disposed to SO in the environment 3Emission (it may be the source of visible plume and local acid rain).
In a preferred embodiment of the present invention, adjust acidity and SO in the burner hearth 3Macroscopical classification of level is reached by using OFA.In another preferred embodiment, regulate acidity and SO in the burner hearth 3The microcosmic classification of level is reached by using low-NOx combustor.In another preferred embodiment, will be used to regulate acidity and SO in the burner hearth by being used in combination macroscopical classification and the microcosmic classification that OFA and low-NOx combustor reach 3Level.Use the burner hearth of SCR for being in operation, preferable acidity is regulated to reduce total flue gas acidity.For the burner hearth that does not use SCR or use bypass SCR, preferable to SO 3Regulate so that to the SO of ESP 3Level increases or helps sinking.For current ESP, the SO in waste gas between about 10 to about 15ppm (by volume) 3Level is suitable for best ESP efficient.
Dew-point temperature is to be used to estimate and/or to regulate the reducing environment variable with the acidity that obtains fully to reduce and/or the SO of expectation 3The suitable parameter of level.In order to reach the SO of an expectation 3Level and work relative humidity can be measured dew point and corresponding adjusting reducing environment variable to reach the expectation dew point.Measure acidity and/or SO 3Other method of level can be used for identical purpose and does not deviate from scope of the present invention.
In a preferred embodiment of the present invention, a power plant is controlled so that a microcosmic stage or a macroscopic view stage reducing environment along degree of depth classification to be provided in low burner hearth.OFA in higher burner hearth can provide essential oxygen to reach acceptable level with the after-flame of guaranteeing remaining uncombusted fuel, burning intermediate and CO.In addition, available SCR comes reducing NOx.Therefore, one embodiment of the invention comprises that one has the combustion furnace of OFA and low-NOx combustor, and it uses sulfurous fuels to reduce dew-point temperature and to reduce SO 3Concentration.In addition, can provide SCR to come reducing NOx.Described low-NOx combustor is preferably following grade: it can provide abundant mixing to reduce and SO so that sufficient acid dew-point temperature to be provided in the starting stage 3Concentration reduces, and therefore, (if needs) allows use SCR.Therefore, one embodiment of the invention comprises that one has the combustion furnace of high-grade low-NOx combustor, and it is used to reduce flue gas acidity, reduces acid dew-point temperature and reduces flue gas SO 3The purpose of concentration.This embodiment can further comprise SCR.
Abundant reducing environment of the present invention be can less than about 2 seconds, better less than about 0.5 second in SO 3Be reduced to SO 2Reducing environment.In the present invention, this reducing environment can be in the phase I flue-gas temperature more than or equal to 900Kelvin (1160), better greater than about 1255K (1800) even goodly realize during greater than about 1650K (2500).One reducing environment for wherein reduce the concentration ratio of group and oxide group greater than concentration ratio about 1, more specifically H group and O group greater than about 1 environment.One better reducing environment for wherein reduce the concentration ratio of group and oxide group greater than concentration ratio about 10, more specifically H group and O group greater than about 10 environment.
Therefore, a kind of SCR that utilizes in combustion process uses sulfurous fuels control SO 3The method of flue gas concentration can comprise the steps:
A) provide one to have the combustion system of low-NOx combustor and SCR
B) in the phase I the described fuel of partial combustion to produce reducing environment;
C) make described reducing environment keep a grace time section, so that with SO 3Be reduced to SO 2And reach the SO of expectation 3Level;
D) in second stage, use oxidation environment combustion fuel residue and burning intermediate;
E) reduce remaining NOx with SCR;
Reduce emission NOx thus.
One utilizes SCR to use sulfurous fuels control SO in combustion process 3The alternative method of the present invention of flue gas concentration comprises the steps:
A) provide a combustion furnace with low-NOx combustor and SCR
A) in a phase I the described fuel of partial combustion to produce a reducing environment;
B) in a second stage, use oxidation environment combustion fuel residue and burning intermediate;
C) acid dew point of measurement flue gas;
D) in the phase I, reducing environment is regulated so that the acid dew point of flue gas is reduced to aspiration level;
Control the SO of flue gas thus 3Concentration.
In another embodiment of the present invention, in combustion process, utilize SCR to use sulfurous fuels control SO with one 3The method of flue gas concentration is controlled combustion furnace, and described method comprises the steps:
A) provide a combustion furnace with low-NOx combustor and SCR
B) in a phase I the described fuel of partial combustion to produce a reducing environment;
C) make described reducing environment keep a grace time section, thereby so that reducible acid reduction is reached the acid concentration of expectation in described flue gas;
D) in a second stage, use oxidation environment combustion fuel residue and burning intermediate;
E) reduce remaining NOx with SCR;
Be controlled to the flue gas SO of SCR thus 3Level.
These methods can comprise the step of microcosmic classification and/or macroscopical classification phase I fuel combustion and/or macroscopical classification.Described microcosmic classification can be by using low-NOx combustor to provide and described macroscopical classification can provide by using after-flame wind.Described fuel can be any fuel, especially carbon-containing fuel, for example coal.Reducing environment can be regulated by any mode described herein, comprises regulating time of staying phase I.
Example
The result that following Examples set can use the inventive method to reach.In 3 different power plants, use the inventive method control SO 3Level.Experimental data shown in the table 1 and 2 is by using high speed after-flame wind and being measured by third company.
Table 1. hierarchy depth in 2 different power plant to SO 3The influence of level.
The N/a-data can not obtain; *-98.5% sulphur is converted into SO in the hypothesis coal 2And 1.5% sulphur is converted into SO in the coal 3The basis on estimate to obtain.
For the situation of " shallow " classification, the after-flame air port is nearly closed, but still comprises cool stream (about 10% total air).For the situation of " medium " classification, total air stream of similar 20% is formed in the after-flame air port.Form similar 30% total air stream for the situation after-flame air port of " deeply " classification.Three groups of equipment is all corner firing equipment and the OFA system is positioned at the burner region top just.
The influence (power plant 3, with table 1 different) of the classification of three kinds of levels of table 2. in a single power plant.
Figure C20058001122200121
Therefore, described experimental data is showed use the inventive method adjusting SO 3The ability of level.
After reading above-mentioned explanation, those in the industry those skilled in the art also can carry out some modification or improvement.For simple and clear and be easy to read, this paper has left out all modifications and improvement, but these contents all suitably are covered by in the aforesaid right claimed range.

Claims (25)

1, a kind ofly controls SO utilizing SCR to use in the combustion process of sulfurous fuels 3During flue gas concentration, flue gas acidity reduces to reach, acid dew-point temperature is controlled, SO to utilize classification in combustion system 3The method of concentration control or above-mentioned combination, described combustion system has low-NOx combustor and SCR, and described method comprises the steps:
A) provide the combustion system of using low-NOx combustor and SCR;
B) in the phase I the described fuel of partial combustion to produce reducing environment;
C) make described reducing environment keep a grace time section, so that with SO 3Be reduced to SO 2To reach the SO of expectation 3Level;
D) in second stage with oxidation environment burning residual fuel and burning intermediate; With
E) reduce remaining NOx with SCR;
Reach the reduction of flue gas acidity, acid dew-point temperature control, SO thus 3Concentration control or above-mentioned combination, and further reduce emission NOx.
2, the method for claim 1, wherein said reducing environment is to produce or adjust by the step that comprises the described phase I fuel combustion of microcosmic classification, and wherein said microcosmic classification comprises generation or adjusts the micro that at least one approaches burner.
3, method as claimed in claim 2, wherein said microcosmic classification comprise uses low-NOx combustor to produce or adjust described at least one nearly micro.
4, the method for claim 1, it further comprises a step, reducing environment described in this step produced or adjusts by macroscopical classification described fuel combustion phase I, and wherein said macroscopical classification comprises the combustion chamber is divided into rich fuel stage and poor fuel stage.
5, method as claimed in claim 4, wherein said macroscopical classification provides by using after-flame wind.
6, the method for claim 1, it further comprises combining of microcosmic classification and macroscopical classification.
7, method as claimed in claim 6, wherein said microcosmic classification comprise uses low-NOx combustor and macroscopical classification to provide by using after-flame wind.
8, the method for claim 1, wherein said fuel are coal.
It is 9, a kind of that flue gas acidity reduces to reach, acid dew-point temperature is controlled, SO by utilizing classification 3Concentration control or above-mentioned combination are operated combustion furnace with control SO 3The method of flue gas concentration, wherein said method comprises the steps:
A) provide a combustion furnace that uses low-NOx combustor and SCR;
B) in the phase I the described fuel of partial combustion to produce reducing environment;
C) make described reducing environment keep a grace time section, thereby so that reducible acid reduction is reached the acid concentration of expectation in described flue gas;
D) in second stage with oxidation environment burning residual fuel and burning intermediate; With
E) reduce remaining NOx with described SCR;
The flue gas SO of described SCR is gone in control thus 3Level.
10, method as claimed in claim 9, it further comprises a step, reducing environment described in this step produces or adjusts by the described phase I fuel combustion of microcosmic classification, and wherein said microcosmic classification comprises generation or adjusts the micro that at least one approaches burner.
11, method as claimed in claim 10, wherein said microcosmic classification provides by using low-NOx combustor, to produce or to adjust described at least one nearly micro.
12, method as claimed in claim 9, it further comprises a step, reducing environment described in this step produced or adjusts by macroscopical classification described fuel combustion phase I, and wherein said macroscopical classification comprises the combustion chamber is divided into rich fuel stage and poor fuel stage.
13, method as claimed in claim 12, wherein said macroscopical classification provides by using after-flame wind.
14, method as claimed in claim 9, it further comprises combining of microcosmic classification and macroscopical classification.
15, method as claimed in claim 14, wherein said microcosmic classification provides by low-NOx combustor and described macroscopical classification provides by after-flame wind.
16, method as claimed in claim 9, wherein said fuel are coal.
Thereby 17, control SO in a kind of combustion process of in combustion system, utilizing classification to utilize SCR use sulfurous fuels 3The method of flue gas concentration, described combustion system has low-NOx combustor and SCR, and described method comprises the steps:
A) provide the combustion furnace that uses low-NOx combustor and SCR;
B) in the phase I the described fuel of partial combustion to produce reducing environment;
C) in second stage with oxidation environment burning residual fuel and burning intermediate;
D) acid dew point of the described flue gas of measurement;
E) in the described phase I, reducing environment is regulated so that make described flue gas acid dew point be reduced to aspiration level;
Control the SO of described flue gas thus 3Concentration.
18, method as claimed in claim 17, the step of the described reducing environment of wherein said adjusting comprise regulates described time of staying phase I.
19, method as claimed in claim 17, it further comprises a step, reducing environment described in this step is adjusted by the described phase I fuel combustion of microcosmic classification at least in part, and wherein said microcosmic classification comprises that adjusting at least one approaches the micro of burner.
20, method as claimed in claim 19, wherein said microcosmic classification provides by using low-NOx combustor.
21, method as claimed in claim 17, it further comprises a step, reducing environment described in this step is adjusted by macroscopical classification described fuel combustion phase I at least in part, and wherein said macroscopical classification comprises the combustion chamber is divided into rich fuel stage and poor fuel stage.
22, method as claimed in claim 21, wherein said macroscopical classification provides by using after-flame wind.
23, method as claimed in claim 17, it further comprises combining of microcosmic classification and macroscopical classification.
24, method as claimed in claim 23, wherein said microcosmic classification provides by low-NOx combustor and macroscopical classification provides by after-flame wind.
25, method as claimed in claim 17, wherein said fuel are coal.
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CN109364723B (en) * 2018-11-07 2021-05-11 江西理工大学 Method for reducing sulfur trioxide in non-ferrous smelting flue gas into sulfur dioxide
CN111167274B (en) * 2020-01-19 2021-11-12 中南大学 Method for removing sulfur trioxide from smelting flue gas and removing device thereof

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