CN109173655A - A kind of SCR denitration process of sintering flue gas - Google Patents
A kind of SCR denitration process of sintering flue gas Download PDFInfo
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- CN109173655A CN109173655A CN201811289698.8A CN201811289698A CN109173655A CN 109173655 A CN109173655 A CN 109173655A CN 201811289698 A CN201811289698 A CN 201811289698A CN 109173655 A CN109173655 A CN 109173655A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000003546 flue gas Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005245 sintering Methods 0.000 title claims abstract description 23
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 15
- 239000000428 dust Substances 0.000 claims abstract description 14
- 230000003197 catalytic effect Effects 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005201 scrubbing Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 26
- 239000003054 catalyst Substances 0.000 description 23
- 229910021529 ammonia Inorganic materials 0.000 description 12
- 238000006477 desulfuration reaction Methods 0.000 description 12
- 230000023556 desulfurization Effects 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 239000003638 chemical reducing agent Substances 0.000 description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000005406 washing Methods 0.000 description 7
- 238000010531 catalytic reduction reaction Methods 0.000 description 6
- 235000019504 cigarettes Nutrition 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002274 desiccant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010410 dusting Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of SCR denitration processes of sintering flue gas, comprising the following steps: (a) flue gas first carries out wet desulphurization after first time dedusting in desulfurizing tower；(b) flue gas carries out second of dust separation；(c) heater heats flue gas, carries out catalytic denitration using SCR method；(d) flue gas is emptied by chimney.GGH heat exchanger is arranged in the present invention on gas flue, is acted on simultaneously by the heat in recovered flue gas with heater, improves flue-gas temperature, this can greatly save energy needed for flue gas, to save cost.
Description
Technical field
The present invention relates to smoke gas treatment field more particularly to a kind of techniques of the SCR denitration of sintering flue gas.
Background technique
Seriously affecting caused by because of pollution, requirement of the country to environmental protection are increasingly stringenter.To metallurgy industry, country has gone out
The unprecedented measure of keeping under strict control of platform, and set hardness index up to standard.For this purpose, each steel mill, ironworks start the cigarette that starts in succession
The denitrating technique of gas discharge.The denitrating technique of flue gas emission comparative maturity has at present, selective non-catalytic reduction method, i.e. SNCR,
Selective catalytic reduction, i.e. SCR.Wherein SNCR be high-temperature catalytic reaction, reaction temperature be typically in the range of 800---1100 DEG C it
Between, because not using catalytic denitration, cost is relatively low, but denitration effect is poor, about 40---60%；And the work of SCR
Making temperature range is 300---450, and compared with SNCR, although construction cost is higher, its denitration efficiency is also high, can reach
70---80%, the method are used by most of boiler of power plant.So the sintering flue gas that current each steel mill, ironworks are built is de-
Nitre technique also substantially uses for reference the SCR technique of boiler of power plant to use.But for sintering flue gas, it is different from power plant
Boiler smoke, the ingredient of gas, each parameter etc. have more complexity.Just because of the particularity of sintering flue gas, cause to utilize SCR
Method is when carrying out denitration to sintering flue gas or denitration efficiency is poor or catalyst is easily poisoned, and therefore, SCR catalytic denitration is in sintering cigarette
Application on gas, there is an urgent need to improve.
Summary of the invention
With boiler of power plant Gas phase Smoke ratio, the characteristics of sintering flue gas, is:
Firstly, flue-gas temperature is low, about 100---150 DEG C, the water vapour in flue gas can be adsorbed on the activity of catalyst surface
In point, to inhibit the activity of catalyst；
Secondly, sintering flue gas Dust is complicated, wherein largely containing containing metal ions such as a large amount of Fe, Mn, Zn, As, Na
Calcium powder dirt.Metal ion easily causes SCR catalyst to be poisoned, and calcic dust is also easy hardened and blocking catalyst channel.
Furthermore traditional SCR technique is arranged before desulfurization process, on the one hand a large amount of SO2 in flue gas will lead to catalysis
On the other hand the destruction of agent active component can be such that the active site of catalyst surface is covered by metal sulfate and ammonium sulfate,
To make catalyst thoroughly inactivate, under cryogenic, this influence can be more significant.
In view of the above-mentioned problems, the present invention is intended to provide a kind of improvement technique of the SCR denitration of sintering flue gas, content is such as
Under:
1, original sintering flue gas first carries out desulfurization using traditional wet desulfurizing process, by SCR denitration process after primary dedusting
It is placed on after sulfur removal technology.
It is intended that first desulfurization, rear denitration can eliminate influence of the sulphur to denitrating catalyst；Furthermore in sulfur removal technology
It can carry out part dedusting；In addition, wet desulfurizing process also reduces flue-gas temperature, create conditions for subsequent high-effective dust-removing.It is real
Verify bright, temperature is higher, and dust removing effects are lower.
2, the flue gas after desulfurization is carrying out fine dedusting, i.e. second of dust separation again in flue gas scrubber.Specifically
The purpose of purification is: although flue gas by dust removal process above-mentioned, desulfurization and dedusting etc., still there is part dust to fail thoroughly
It eliminates；Besides, the doctor solution of part is also resulted in the wet desulphurization of previous step and desulfurization product follows in flue gas, pass through
This part can be attached object and removed together by washing, be subsequent efficient, long-acting catalysis to reach gas cleaning cleaning purpose
Reaction creates sufficiency.
Existing SCR denitration technology, the main original that catalyst is short using the time, catalytic effect can gradually be deteriorated in use
Because be exactly dust in flue gas, especially fine particle dust can gradually blocking catalyst reaction compartment.In the present invention, flue gas
After the purification of water spray gas washing, the dust content in flue gas reaches≤1mg/m3, even more small.It thus can be very good to solve
The problem of catalyst of having determined deteriorates.
3, flue gas can be dried again after second of dust separation.
Flue gas is through second of dedusting, although having carried out demisting processing, moisture content is still larger.Not influence subsequent catalyst
It is long-acting and efficient, flue gas need to be dried to remove moisture removal.Adoptable desiccant is charcoal, high hydroscopic resin etc..Separately
Outside, because this step is to remove water drying at low temperature, water removal effect is good, can reduce influence of the moisture to catalyst well.
4, heater provides extra heat source, and purified flue-gas temperature is heated to catalyst operating temperature range；Heating
After flue gas afterwards is mixed with the reducing agent of penetrating, into SCR reactor；NOx and reducing agent in catalyst surface, flue gas is anti-
It answers, generates N2And H2O.In SCR reactor, custom catalysts are that V2O5/TiO2 base catalyst (also uses the catalysis in this programme
Agent), operating temperature is 300---420 DEG C.
The purpose that heater is arranged is to improve the temperature of flue gas.This is because purified temperature only has 30---60 DEG C,
Therefore want external heat source by the operating temperature range of flue gas to catalyst.Heat the common heating method that can be taken, such as electricity
Heating or Hot-blast Heating.Common reducing agent is NH3And urea, it is uniformly sprayed in flue gas by nozzle.
To save heat-source energy, GGH heat exchanger can be set on gas flue, pass through the heat and heater in recovered flue gas
It acts on simultaneously, improves flue-gas temperature, this can greatly save energy needed for flue gas, to save cost.GGH heat exchanger is best
Using rotary GGH heat exchanger.
In the present invention, the operating position of GGH and purpose are different from the GGH of the prior art.In the prior art, GGH is arranged
At flue outlet, the flue gas emptied in advance is heated by absorbing the flue gas heat of rigid boiler out, purpose is to reduce throat
" white cigarette " phenomenon；And in the present invention, GGH setting is at flue rear portion, and after flue gas desulfurization and washing, purpose is to extract walkthrough
Heat in empty flue gas reduces heater and provides heat, reach energy conservation and reduce cost mesh to heat the flue gas for preparing denitration
's.
5, flue gas enters chimney high temperature after coming out from SCR reactor and empties.Flue gas successively passes through dedusting, desulfurization, removes again
Dirt purification, denitration, flue gas can reach clean emission.In addition, because the temperature of final flue gas is high, in general, the outlet temperature of flue gas
Degree is 150 DEG C or more, and the appearance of " white cigarette " is not had at throat, so that collaboration reaches " disappearing white " purpose.
Even if after being recycled or taking GGH flue gas heat exchange to fume afterheat, final flue-gas temperature also can be
100 DEG C or more, chimney breast will not generate white cigarette.
Related terms paraphrase in the present invention is as follows:
1, SCR:SCR(Selective Catalytic Reduction) denitration technology referred to and closed using reducing agent (NH3 etc.)
Suitable temperature range (300-420 DEG C) under aerobic conditions under the effect of the catalyst by NOx selectivity be reduced to it is harmless
Nitrogen and water；SCR denitration technology has the advantages that denitrification rate is high, and selectivity is good, mature and reliable, is that home and abroad station is most adopted extensively
Gas denitrifying technology；SCR technology is that U.S. Eaglehard obtains patent in the fifties, and the seventies later period is in Japan
Industrial power station is applied, and is then widely used in areas such as Europe, the U.S..
2, SCR reactor: selective catalytic reactor is the place that the NOx in flue gas is reacted with reducing agent, by catalyst
Carrier assembles, and flue gas and reducing agent pass through between catalyst surface gap, and catalytic reduction reaction occurs on surface.
3, SNCR:SNCR(Selective Non-Catalytic Reduction) denitration technology, that is, selective non-catalytic
Reduction technique, be it is a kind of do not have to catalyst, within the temperature range of 850~1100 DEG C, by amino-containing reducing agent (such as ammonium hydroxide,
Urea liquid etc.) it sprays into furnace, the NOx in flue gas is restored into removing, generates the cleaning denitration technology of nitrogen and water.SNCR flue gas
The denitration efficiency of denitration technology is lower, and generally 30%~50%, it is influenced by boiler structure size very big.
4, wet desulphurization: for steel mill's boiler smoke or the common sulfur method of power plant's sintering flue gas.In desulfurizing tower into
Row, desulfurizing agent is liquid, is generally contacted by spray mode with flue gas adverse current, reaches and aoxidizes the sulfur dioxide and three in flue gas
Sulphur is removed.Common desulfurizing agent is that limestone slurry and magnesia are starched, the former becomes desulfurization by lime gypsum method, the latter's appellation
Magnesium processes desulfurization.
5, first time dedusting: the common dedusting method of flue gas, usually electrostatic precipitator dedusting or sack cleaner dedusting,
It is located at gas flue leading portion, before other flue gas treating process.
6, second of dedusting: refer to the dust collecting process again after flue gas desulfurization to flue gas in the present invention, refer specifically to, washing
In tower, perhaps flue gas is washed with water using spray mode or flue gas completes water washing in plate column.
7, GGH: flue gas heat-exchange unit (Gas Gas Heater), is one of the main device in flue gas desulphurization system.It
Effect is to be heated the neat stress after desulfurization using former flue gas, reaches exhaust gas temperature on dew point, is mitigated to flue
With the corrosion of chimney, the diffusance of pollutant is improved；It is lowered into the flue-gas temperature on absorption tower simultaneously, reduces in tower to corrosion-resistant
Process specifications.
8, drier: for desiccant and its aggregate of fixed device, the shape of cross section is similar to flue channel but ruler
It is very little smaller, it can be placed in flue.Common desiccant is elastic sponge body, active carbon and super absorbent resin etc., drying
The shape of agent is granular, sheet or bulk etc., and flue gas can allow for pass through, and can absorb the moisture in flue gas.It is dry
Switch gate is arranged in the corresponding flue position of device, can periodically replace to drier.
Gas bypass is arranged in flue at drier, when replacing drier, flue gas by-passing flue.Best measure
It is that drier is set simultaneously on gas bypass.
9, it sprays ammonia device: being the arrangement apparatus of the reducing agent in SCR method, it can be by reducing agent (liquefied ammonia or urea) in flue
Uniformly it is sprayed in flue gas.
10, heater: to provide the equipment of extra heat source, can be electric heater, can be gas heater, effect
It is that purified flue-gas temperature is heated to catalyst operating temperature range.
The technical solution of the present invention is as follows:
A kind of SCR denitration process of sintering flue gas, it is characterised in that the following steps are included:
(a) flue gas first carries out wet desulphurization after first time dedusting in desulfurizing tower；
(b) flue gas carries out second of dust separation；
(c) heater heats flue gas, carries out catalytic denitration using SCR method；
(d) flue gas is emptied by chimney.
Preferably, wherein step (b) is that water spray purification is carried out in scrubbing tower.
Preferably, wherein also carrying out demisting processing to flue gas in scrubbing tower or outside tower.
Preferably, wherein also flue gas is dried after (b) step before (c) step.
Preferably, wherein GGH heat exchanger is arranged in flue before heater, pass through the heat after extracting denitration in flue gas
To preheat the flue gas of non-denitration.
Figure of description
Fig. 1 is the process flow diagram of embodiment 1.
Fig. 2 is the process flow diagram of embodiment 2.
Fig. 3 is the process flow diagram of embodiment 3.
In figure, 1, primary dedusting device, 2, desulfurizing tower, 3, final dusting device, 4, demister, 5, heater, 6, spray ammonia
Device, 7, drier, 8, SCR reactor, 9, GGH heat exchanger, 10, chimney.
Specific embodiment
Embodiment 1
The flue gas come out from sintering machine sequentially enters primary dedusting device 1 i.e. sack cleaner and is dusted；Into in desulfurizing tower 2
Wet desulphurization being carried out, sulfur method is lime stone -- gypsum, desulfurizing tower are spray column；It is washed into final dusting device 3
Spray washing is carried out with water in tower；It is externally provided with demister 4 in scrubbing tower, into demister demisting；Electric heater 5 is set in flue,
By flue gas to 350 DEG C -- 420 DEG C；By spray ammonia device 6, by liquefied ammonia, proportionally (molar ratio of nitrogen oxides and liquefied ammonia is about
1:1.2-2) spray into flue gas；It is reacted into SCR reactor 8；Atmosphere is discharged by chimney 10.
Embodiment 2
The flue gas come out from sintering machine sequentially enters bag filter and is dusted；Into wet desulphurization is carried out in desulfurizing tower, take off
Sulphur method is lime stone -- gypsum, and desulfurizing tower is spray column；It is washed into scrubbing tower with water；It is externally provided in scrubbing tower
Demister, into demister demisting；It is dried into drier 7；Electric heater is set in flue, by flue gas to 350
℃--420℃；Liquefied ammonia proportionally (molar ratio of nitrogen oxides and liquefied ammonia is about 1:1.2-2) is sprayed into cigarette by spray ammonia device
Gas；It is reacted into SCR reactor；Into electricity generation system, generate electricity；Atmosphere is discharged by chimney.
Embodiment 3
The flue gas come out from sintering machine sequentially enters bag filter and is dusted；Into wet desulphurization is carried out in desulfurizing tower, take off
Sulphur method is lime stone -- gypsum, and desulfurizing tower is spray column；Spray washing is carried out with water into scrubbing tower；Outside scrubbing tower
Equipped with demister, into demister demisting；It is dried into drier；It is tentatively heated into GGH heat exchanger 9；Flue
Electric heater is inside set, by flue gas to 350 DEG C -- 420 DEG C；By spray ammonia device by liquefied ammonia proportionally (nitrogen oxides and liquefied ammonia
Molar ratio be about 1:1.2-2) spray into flue gas；It is reacted into SCR reactor；Partial heat is changed away into GGH heat exchanger；
Atmosphere is discharged by chimney.
Claims (5)
1. a kind of SCR denitration process of sintering flue gas, it is characterised in that the following steps are included:
(a) flue gas first carries out wet desulphurization after first time dedusting in desulfurizing tower；
(b) flue gas carries out second of dust separation；
(c) heater heats flue gas, carries out catalytic denitration using SCR method；
(d) flue gas is emptied by chimney.
2. the SCR denitration process of sintering flue gas according to claim 1, wherein step (b) is to carry out water in scrubbing tower
Spray cleaning.
3. the SCR denitration process of sintering flue gas according to claim 2, wherein in scrubbing tower or outside tower also to flue gas into
The processing of row demisting.
4. the SCR denitration process of sintering flue gas described in -4 according to claim 1, wherein also right after (b) step before (c) step
Flue gas is dried.
5. the SCR denitration process of sintering flue gas according to claim 4, wherein after flue and denitration before flue gas
Flue between GGH heat exchanger is set, preheat the flue gas of non-denitration by extracting the heat after denitration in flue gas.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110523158A (en) * | 2019-09-04 | 2019-12-03 | 武汉龙净环保科技有限公司 | The system and method that the comprehensive collaboration of titanium dioxide calcined by rotary kiln tail gas is administered |
| CN110585871A (en) * | 2019-10-09 | 2019-12-20 | 中机中联工程有限公司 | Flue gas purification process and device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0487626A (en) * | 1990-07-30 | 1992-03-19 | Chiyoda Corp | Method of desulfurizaton and denitration |
| WO2008123489A1 (en) * | 2007-03-30 | 2008-10-16 | Mitsubishi Heavy Industries Environment Engineering Co., Ltd. | Exhaust gas treating apparatus and method of treating exhaust gas |
| DE102010020277A1 (en) * | 2010-05-11 | 2011-11-17 | Johnson Matthey Catalysts (Germany) Gmbh | Method for reducing nitrogen oxide in flue gas of waste incineration system utilized to produce electricity, involves removing nitrogen using catalytic converter device after selective catalytic reduction process in low temperature region |
| CN105169942A (en) * | 2015-09-23 | 2015-12-23 | 广州创能环保科技有限公司 | Glass melter flue gas dust removal, desulfurization and denitrification synergetic treatment system, treatment method and application |
| CN205340542U (en) * | 2016-01-25 | 2016-06-29 | 陕西蔚蓝节能环境科技集团有限责任公司 | Low low temperature dust removal SOx/NOx control system |
| CN206762557U (en) * | 2017-04-21 | 2017-12-19 | 上海市机电设计研究院有限公司 | The biomass electric power plant system for cleaning fume of dry desulfurization and low-temperature denitration |
| CN107694301A (en) * | 2016-08-08 | 2018-02-16 | 无锡市曜通环保机械有限公司 | A kind of fire coal boiler fume denitration wet desulphurization electric dust collector |
-
2018
- 2018-10-31 CN CN201811289698.8A patent/CN109173655A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0487626A (en) * | 1990-07-30 | 1992-03-19 | Chiyoda Corp | Method of desulfurizaton and denitration |
| WO2008123489A1 (en) * | 2007-03-30 | 2008-10-16 | Mitsubishi Heavy Industries Environment Engineering Co., Ltd. | Exhaust gas treating apparatus and method of treating exhaust gas |
| DE102010020277A1 (en) * | 2010-05-11 | 2011-11-17 | Johnson Matthey Catalysts (Germany) Gmbh | Method for reducing nitrogen oxide in flue gas of waste incineration system utilized to produce electricity, involves removing nitrogen using catalytic converter device after selective catalytic reduction process in low temperature region |
| CN105169942A (en) * | 2015-09-23 | 2015-12-23 | 广州创能环保科技有限公司 | Glass melter flue gas dust removal, desulfurization and denitrification synergetic treatment system, treatment method and application |
| CN205340542U (en) * | 2016-01-25 | 2016-06-29 | 陕西蔚蓝节能环境科技集团有限责任公司 | Low low temperature dust removal SOx/NOx control system |
| CN107694301A (en) * | 2016-08-08 | 2018-02-16 | 无锡市曜通环保机械有限公司 | A kind of fire coal boiler fume denitration wet desulphurization electric dust collector |
| CN206762557U (en) * | 2017-04-21 | 2017-12-19 | 上海市机电设计研究院有限公司 | The biomass electric power plant system for cleaning fume of dry desulfurization and low-temperature denitration |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111495131A (en) * | 2019-06-05 | 2020-08-07 | 河北中科朗博环保科技有限公司 | Flue gas reflux system |
| CN110523158A (en) * | 2019-09-04 | 2019-12-03 | 武汉龙净环保科技有限公司 | The system and method that the comprehensive collaboration of titanium dioxide calcined by rotary kiln tail gas is administered |
| CN110585871A (en) * | 2019-10-09 | 2019-12-20 | 中机中联工程有限公司 | Flue gas purification process and device |
| CN110882599A (en) * | 2019-12-09 | 2020-03-17 | 浙江天洁环境科技股份有限公司 | Sintering machine flue gas treatment system and method |
| CN111151110A (en) * | 2020-02-07 | 2020-05-15 | 中国恩菲工程技术有限公司 | System and method for treating flue gas |
| CN111203097A (en) * | 2020-02-28 | 2020-05-29 | 成都易态科技有限公司 | Flue gas purification treatment equipment and flue gas purification treatment method |
| CN111203097B (en) * | 2020-02-28 | 2024-02-02 | 成都易态科技有限公司 | Flue gas purifying treatment equipment and flue gas purifying treatment method |
| CN111545020A (en) * | 2020-05-12 | 2020-08-18 | 江苏峰峰鸿运环保科技发展有限公司 | Ammonia process-SCR combined desulfurization and denitrification device and method |
| CN114159967A (en) * | 2021-12-06 | 2022-03-11 | 长沙有色冶金设计研究院有限公司 | Flue gas SCR denitration and whitening technology |
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