CN107930396A - A kind of method for sintering fume centralized high-efficiency desulfurization denitration - Google Patents
A kind of method for sintering fume centralized high-efficiency desulfurization denitration Download PDFInfo
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- CN107930396A CN107930396A CN201711211985.2A CN201711211985A CN107930396A CN 107930396 A CN107930396 A CN 107930396A CN 201711211985 A CN201711211985 A CN 201711211985A CN 107930396 A CN107930396 A CN 107930396A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—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
- B01D53/8628—Processes characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- 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
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Abstract
The invention discloses a kind of method for sintering fume centralized high-efficiency desulfurization denitration, this method is that the flue gas by sintering machine along feeding end to direction of discharge is divided into leading portion, preceding stage casing, five partial fume of stage casing, middle endpiece and endpiece, preceding stage casing flue gas recirculation is utilized, NOx is concentrated to be discharged into the flue gas of sintering machine stage casing, the high NOx flue gases in stage casing exchange heat with middle endpiece flue gas by heat exchanger, and converging with endpiece high-temperature flue gas makes flue-gas temperature meet SCR method denitration requirements more than 250 DEG C.The high SOx flue gases of endpiece carry out desulfurization in sintering machine after heat exchange.The flue gas after flue gas, denitration after desulfurization merges with sintering machine leading portion flue gas, is discharged through chimney.SOx and NOx are enriched in specific region section and carry out concentration desulphurization and denitration by this method, and treatment quantity is greatly reduced and reduces pollutant control cost.
Description
Technical field
The present invention relates to a kind of method of sintering flue gas desulfurization denitration, more particularly to a kind of sintering fume centralized high-efficiency desulfurization
The method of denitration, belongs to Ferrous Metallurgy smoke comprehensive Treatment process field.
Background technology
Global warming, the deterioration of the ecological environment historical background under, " the low-carbon based on low energy consumption, low stain
It is economical " become the focus attracted attention in the whole world.Steel and iron industry is the basic industry in China's industrial system, but is also typical high consumption
Energy, high pollutive industries, its energy consumption account for the 15.25% of whole industrial department energy consumption；It is total that discharge amount of exhaust gas accounts for national industrial discharge
The 16% of amount；The pollutional load discharged accounts for 10% or so that industry is always discharged.
Iron and Steel Enterprises in China ironmaking system with sinter-blast furnace process based on, wherein sintering be by iron ore, flux, fuel
The process of ore deposit is sintered at high temperature into after dispensing mixing on sintering machine.Sintering process is the main pollution of steel and iron industry flue gas pollutant
Source, sintered discharge gas amount account for the 40% of the total exhausted air quantity of steel and iron industry, its flue gas discharged contains the multiple pollutants such as SOx, NOx, its
Difficulty of governance is big.
China's sintering flue gas pollutant discharge standard is increasingly stringent, and from 1 day January in 2015, China comes into effect new《Steel
Ironworker's industry sinters (pelletizing) pollutant emission standard》, it is specified that dust≤50mg/Nm3, SO2≤200mg/Nm3, NOx≤300mg/
Nm3, bioxin≤0.5ng/Nm3.In June, 2017, State Ministry of Environmental Protection issued《Steel sintering, pelletizing industrial air pollution thing row
Put standard》Revision bulletin, by particulate matter, SO2, NOx emission limit be adjusted to 20mg/Nm3、50mg/Nm3、100mg/Nm3,
The further stringent emission limit of pollutant, also significantly increases the difficulty of sintering smoke gas treatment.
China's sintering smoke gas treatment currently mainly uses single method for removing pollutant.Flue gas desulfurization mainly uses lime
Stone-gypsum, ammonia ammonium sulphate process, ciculation fluidized bed process etc., desulfurization degree is all up to more than 90%.Sintering flue gas desulfurization technology
In China, comparative maturity, most sintering plants have all built flue gas desulfurization facilities.Therefore, on the basis of desulfurization, such as
What realizes NO_x Reduction by Effective, sintering flue gas pollutant is administered significant.
Sinter gas denitrifying technology mainly selective catalytic reduction method (SCR), noncatalytic reduction (SNCR), SCR/
SNCR mixing methods etc., in China, Baosteel has taken the lead in realizing sintering flue gas SCR denitration Industrial demonstration.At present, desulfurization combination SCR denitration
There are two kinds of technical solutions, first, denitration after first desulfurization, low due to sintering flue-gas temperature after desulfurization, do not reach anti-needed for SCR denitration
Temperature is answered, sintering flue-gas temperature need to be improved by external heat, causes that denitration high energy consumption, equipment are huge, operating cost is high.Second, first
Desulfurization after denitration, due to the SO of flue gas middle and high concentration2, alkali metal, heavy metal etc. have serious poisoning effect to catalyst, cause
Catalyst easily fails, so that catalyst usage amount is big, operating cost is high.
Therefore, although desulfurization and the equal comparative maturity of SCR denitration technology, in smoke gas treatment is sintered, both are not carried out
Organically linking.The influence that flue-gas temperature is low, poisons constituent element to catalyst how is solved, is ensureing the basis of denitrification efficiency
On, realize pollutant control economical and efficient, have important practical significance to sintering clean manufacturing.
The content of the invention
For existing sintering flue gas desulfurization combination SCR denitration technique there are desulphurization denitration it is incompatible the problem of, such as first desulfurization
Denitration is there are desulfurization after high energy consumption, first denitration there are the problems such as catalyst poisoning afterwards, and the purpose of the invention is to provide one
The method of kind of sintering fume centralized high-efficiency desulfurization denitration, this method is by SO2Discharged respectively in sintering machine specific region with NOx, point
Desulfurization and denitration are not carried out not individually, while the treating capacity of flue gas is reduced, the compatibility of desulphurization denitration are realized, so as to utilize
On the basis of existing sulfur removal technology, economy, NO_x Reduction by Effective are carried out to flue gas.
In order to realize above-mentioned technical purpose, the present invention provides it is a kind of sinter fume centralized high-efficiency desulfurization denitration method,
This method is that the flue gas by sintering machine along feeding end to direction of discharge is divided into leading portion, preceding stage casing, stage casing, middle endpiece and tail
Five partial fumes of section, and leading portion, preceding stage casing, stage casing, the length ratio of middle endpiece and endpiece are 2~4:4~6:8~10:3~5:2
~4；In sintering process, preceding stage casing flue gas recirculation to stage casing charge level recycles, while is blended into ring cold machine hot waste gas, make circulation into
Enter the flue gas O of stage casing fabric2Content is more than 16%, temperature and is higher than 100 DEG C；After stage casing flue gas is exchanged heat with middle endpiece flue gas,
Stage casing flue gas is warming up to more than 120 DEG C, then converges with endpiece flue gas into denitrification apparatus denitration；Middle endpiece flue gas is after heat exchange
Into desulfurizer desulfurization.
Preferable scheme, stage casing flue gas converge with endpiece flue gas, make to converge flue-gas temperature more than 250 DEG C, are filled into denitration
Put denitration.
More preferably scheme, the denitrification apparatus use SCR reactor denitrations.
Preferable scheme, the desulfurizer is using in lime stone-gypsum method, ammonia process, magnesium processes, fluid bed dense-phase tower method
A kind of mode desulfurization.
Preferable scheme, desulfurizer discharge flue gas, denitrification apparatus are discharged and converged with leading portion flue gas, arranged by chimney
Put.
The method of the sintering fume centralized high-efficiency desulfurization denitration of the present invention, it is important to which SOx and NOx are enriched in specific region
In the flue gas of section, it is carried out respectively to concentrate desulphurization and denitration processing, after efficiently solving first desulfurization in the prior art denitration deposit
The high energy consumption the defects of, easily there are catalyst poisoning for desulfurization after also solving the problems, such as first denitration.At the same time by SO2With NOx points
The discharge of sintering machine specific region is not enriched in, substantially reduces the treating capacity of flue gas, and economy, high-efficiency desulfurization denitration are carried out to flue gas.
The method of the sintering fume centralized high-efficiency desulfurization denitration of the present invention is mainly to sintering machine Nei Ge areas in sintering process
The smoke components that domain produces are different, accordingly take different methods to be handled, leading portion flue gas SO2It is low with NOx content, and temperature
It is low, can directly it discharge, and preceding stage casing NOx content is improved with respect to leading portion, but directly progress denitration process can increase fume treatment
Amount, is recycled to sintering machine stage casing secondary use, can be by NOxSintering machine stage casing flue gas is enriched in, changes into high NOx content
Low SO2The flue gas of content, then concentrate carry out denitration process.Since stage casing flue gas is difficult in using SCR reactor denitrification process
Reach more than 250 DEG C, it is difficult to meet SCR reactor denitration requirements, endpiece flue gas heat exchange in dexterously utilization of the invention, then converge
The high endpiece fume centralized of NOx content carries out denitration process, and the temperature requirement of SCR denitration is met under the conditions of external heat is not required to.
And middle endpiece flue gas enrichment alkali metal and SO2, it is directly subjected to desulfurization process, avoids alkali metal to SCR reactor catalysis
The toxic action of agent.
In the sintering fume centralized high-efficiency desulfurization method of denitration of the present invention, preceding stage casing flue gas recirculation to sintering machine charge level carries out
Recycle, circulation petticoat pipe is covered in sintering machine stage casing, and is blended into ring cold machine hot waste gas, makes gas O in circulation petticoat pipe2Content is big
It is higher than 100 DEG C in 16%, temperature.By flue gas recirculation, NOx is concentrated and is discharged into the flue gas of sintering machine stage casing.
Compared with prior art, it is the advantages of technical scheme：
1. by flue gas recirculation technology, NOx is concentrated and is discharged into the flue gas of sintering machine stage casing, only need to be to high NOx concentration cigarette
Gas carries out denitration process, significantly reduces treatment quantity.
2. by the internal heat exchange of stage casing flue gas and middle endpiece flue gas, and endpiece high-temperature flue gas is combined, can be not right
On the premise of flue gas carries out external heat, the flue-gas temperature before denitration is set to reach more than 250 DEG C, so as to meet SCR efficient denitration
Temperature requirement.
3. by high SO2The independent desulfurization of flue gas, desulfurization fume treating capacity are reduced to 1/6 of traditional handicraft or so, so that significantly
Reduce the operating cost of sweetening process.
4. by high NOx flue gases and high SO2Flue gas separately focuses on, and avoids SO2To the poisoning effect of denitrating catalyst,
Poisoning effect of the alkali metal such as K, Na to catalyst is greatly reduced at the same time, denitration efficiency can be further improved.
5. the concentration desulfurization denitration method of the present invention, most of producer that sinters can utilize existing desulfurization equipment, only need
Increase smaller denitrification apparatus, be not required to external heating and high-efficiency desulfurization denitration can be achieved, desulfurization degree reaches more than 95%, takes off
Nitre rate reaches more than 70%, while treatment quantity is greatly reduced, desulfurization fume treating capacity reduction more than 70%, at denitration flue gas
Reason amount reduces 50%, reduces denitration facility investment cost 35%~50%, reduces desulphurization denitration operating cost 30%~40%.
Brief description of the drawings
【Fig. 1】For existing sintering flue gas desulfurization denitrating technique flow chart；
【Fig. 2】For the sintering fume centralized high-efficiency desulfurization denitrating technique flow chart of the present invention.
Embodiment
Content that following embodiments are further intended to that the present invention will be described in detail, rather than the protection of limitation the claims in the present invention
Scope.
Fig. 1 is existing series connection desulfurizing and denitrifying process flow, and SOx and NOx is enriched with by Fig. 2 respectively for the embodiment of the present invention 1,
And carry out concentrating the technological process of desulphurization and denitration processing respectively.
Embodiment 1
By sintering machine along its length (i.e. material feeding end to discharge end), it is divided into leading portion, preceding stage casing, stage casing, middle endpiece,
Five part of endpiece, length ratio are 3:5:9:4:3, in sintering process, leading portion flue gas particles≤20mg/Nm3、SO2≤50mg/
Nm3、NOx≤100mg/Nm3, smoke stack emission can be passed directly into, preceding stage casing is recycled to sintering machine charge level and carries out circulation profit
With circulation petticoat pipe is covered in sintering machine stage casing, and is blended into ring cold machine hot waste gas, makes gas O in circulation petticoat pipe2Content for 17%,
110 DEG C of temperature；Stage casing flue gas flue gas NOx ＞ 200mg/Nm3, after it is exchanged heat with middle endpiece flue gas, 120 DEG C are warming up to,
Converge again with endpiece flue gas, temperature brings up to 250 DEG C, after dedusting, uses SCR mode denitrations into denitrification apparatus, finally
Flue gas reaches discharge standard, is delivered to smoke stack emission.Middle endpiece flue gas particles ＞ 50mg/Nm3、SO2＞ 200mg/Nm3、NOx
≤100mg/Nm3, enter desulfurizer after being directly over dedusting, using the ammonia process of desulfurization, desulfurization fume is delivered to smoke stack emission.Tail
Section flue-gas temperature is more than 300 DEG C, itself and stage casing flue gas are converged, and improves mixed flue gas temperature and reaches SCR denitration to 250 DEG C
It is required that.
Opposite series connection desulfurizing and denitrifying process flow, method desulfurization degree of the invention reach 95%, and denitration rate reaches 70%, together
When be greatly reduced treatment quantity, desulfurization fume treating capacity reduces 70%, and denitration treatment quantity reduces 50%, reduces denitration and sets
Cost of investment 40% is applied, reduces desulphurization denitration operating cost 35%.
Claims (5)
- A kind of 1. method for sintering fume centralized high-efficiency desulfurization denitration, it is characterised in that：By sintering machine along feeding end to discharge end The flue gas in direction is divided into leading portion, preceding stage casing, five partial fume of stage casing, middle endpiece and endpiece, and leading portion, preceding stage casing, stage casing, The length ratio of middle endpiece and endpiece is 2~4:4~6:8~10:3~5:2~4；In sintering process, preceding stage casing flue gas recirculation to stage casing charge level recycles, while is blended into ring cold machine hot waste gas, make circulation into Enter the flue gas O of stage casing charge level2Content is more than 16%, temperature and is higher than 100 DEG C；After stage casing flue gas is exchanged heat with middle endpiece flue gas, Stage casing flue gas is warming up to more than 120 DEG C, then converges with endpiece flue gas into denitrification apparatus denitration；Middle endpiece flue gas is after heat exchange Into desulfurizer desulfurization.
- A kind of 2. method for sintering fume centralized high-efficiency desulfurization denitration according to claim 1, it is characterised in that：Stage casing cigarette Gas converges with endpiece flue gas, makes to converge flue-gas temperature more than 250 DEG C, into denitrification apparatus denitration.
- A kind of 3. method for sintering fume centralized high-efficiency desulfurization denitration according to claim 3, it is characterised in that：It is described de- Nitre device uses SCR reactor denitrations.
- A kind of 4. method for sintering fume centralized high-efficiency desulfurization denitration according to claim 1, it is characterised in that：It is described de- Sulphur device is using a kind of mode desulfurization in lime stone-gypsum method, ammonia process, magnesium processes, fluid bed dense-phase tower method.
- 5. according to a kind of method for sintering fume centralized high-efficiency desulfurization denitration of Claims 1 to 4 any one of them, its feature exists In：Desulfurizer discharge flue gas, denitrification apparatus are discharged and converged with leading portion flue gas, pass through smoke stack emission.
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Cited By (3)
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| CN110953894A (en) * | 2019-12-16 | 2020-04-03 | 北京中航泰达环保科技股份有限公司 | Sintering machine flue gas circulation purification and waste heat utilization system and method |
| CN112569759A (en) * | 2019-09-27 | 2021-03-30 | 江苏集萃冶金技术研究院有限公司 | Sintering process based on coupling of flue gas pollutant emission reduction through sintering flue gas quality-divided circulation |
| CN113828133A (en) * | 2021-08-27 | 2021-12-24 | 上海交通大学 | Iron ore sintering flue gas multi-pollutant coprocessing device |
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| CN113828133A (en) * | 2021-08-27 | 2021-12-24 | 上海交通大学 | Iron ore sintering flue gas multi-pollutant coprocessing device |
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| CN107930396B (en) | 2020-03-24 |
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