CN109316963A - One kind taking off white system and method for sintering device flue gas denitration - Google Patents
One kind taking off white system and method for sintering device flue gas denitration Download PDFInfo
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- CN109316963A CN109316963A CN201811345627.5A CN201811345627A CN109316963A CN 109316963 A CN109316963 A CN 109316963A CN 201811345627 A CN201811345627 A CN 201811345627A CN 109316963 A CN109316963 A CN 109316963A
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- Prior art keywords
- flue gas
- denitration
- sintering device
- white
- flue
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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
- B01D53/8631—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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- 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
Abstract
The invention discloses one kind to take off white system and method for sintering device flue gas denitration, and the system comprises GGH heat-exchange system, hot-blast stove hybrid system, ammonium hydroxide direct-injection system and SCR reaction systems；This method is based on system described above；The present invention devises a kind of denitrating technique and its system for flue gas in original desulphurization system, denitrating technique and its used equipment is set organically to be combined into a complete process system, pass through the structure design and the control of installation parameter of equipment used for denitrating technique, reach better than required temperature requirement in denitrating technique, to improve the performance and efficiency of whole denitration, while removing nitrogen oxides, the elimination of white plume also may be implemented.
Description
Technical field
The present invention relates to flue gases purification fields, in particular to a kind of to take off white system and side for sintering device flue gas denitration
Method.
Background technique
The selective catalytic reduction method of main method (SCR) of country's denitrating flue gas, selective non-catalytic reduction method at present
(SNCR), wet process complex absorption techniques, liquid phase oxidation-absorption techniques, gaseous oxidation-absorption techniques etc., wherein first two method
There is comparable utilization in industries such as power plant, cement.But since its Process window temperature is higher (at least 300 DEG C or more), and burn
It is different from power-plant flue gas to tie (pelletizing) flue gas, high temperature section is not present, temperature is at 200 DEG C hereinafter, so SCR and SNCR technology is in smelting
Gold (sintering and pelletizing) industrial application is very difficult.
Currently, sintering (pelletizing) fume treatment engineering, is generally only dusted, desulfurization fume processing.In desulfurization project
90% uses limestone scrubbing FGD, traditional selective catalytic reduction (SCR) and selective non-catalytic reduction method
(SNCR) technique can not find suitable temperature window.As environmental requirement is higher and higher, subsequent setting denitration and flue gas elimination are white
Color plume is the environmental protection index for having to complete, therefore subsequent denitration renovation technique scheme has to match with former desulphurization system
Close just more valuable and meaning.
Based on this, need it is a kind of improved on the basis of original desulphurization system denitration efficiency for sintering device flue gas denitration
White system and method is taken off to be devised.
Summary of the invention
The present invention provides one kind and takes off white system and method for sintering device flue gas denitration, on original desulphurization system basis
On, improve denitration efficiency.
One kind taking off white system for sintering device flue gas denitration, including GGH heat-exchange system, hot-blast stove hybrid system, ammonium hydroxide are straight
Spray system and SCR reaction system, the former smoke inlet of GGH heat-exchange system lower part connect desulfurizing tower, GGH heat exchange system
The former exhanst gas outlet on system top connects hot-blast stove hybrid system, and the other end of the hot-blast stove hybrid system is connected to ammonium hydroxide direct-injection
System, the other end of the ammonium hydroxide direct-injection system are connected to SCR reaction system, and the other end of the SCR reaction system is connected to
The neat stress outlet of the former smoke inlet on GGH heat-exchange system top, GGH heat-exchange system lower part is connected to tapping equipment；Its
In, nozzle is provided on flue in the hot-blast stove hybrid system, between the spout central and flue center of the nozzle
Distance is the 9~16% of flue width.
More preferably, the distance between the spout central of the nozzle and flue center are the 10% of flue width.
More preferably, the spout of the nozzle is square opening channel-shaped.
More preferably, the nozzle is in horn mouth formula, and horn mouth bevel edge angle is 45 °.
More preferably, the SCR reaction system is disposed with deflector and flow straightening grid along airintake direction in entrance.
More preferably, it is provided with double-current spray gun body in the ammonium hydroxide direct-injection system, so that ammonia atomization.
More preferably, static mixer is additionally provided between the ammonium hydroxide direct-injection system and SCR reaction system.
More preferably, at least one turbulent area is provided in the static mixer.
More preferably, the static mixer is folded plate type static mixer, and at least one layer is provided in static mixer
Baffle plate.
Present invention process using high-temperature flue gas discharge, therefore take into account sintering device flue gas take off it is white, this method be based on it is described above
One kind take off white system for sintering device flue gas denitration, comprising the following steps:
Step 1 makes the flue gas to be processed after desulfurization exchange heat by GGH heat-exchange system, and desulfurization outlet temperature is warming up to
250℃；
Step 2, will heat up after flue gas mixed with the flue gas from hot-blast stove hybrid system, the flue gas of denitration is warming up to
320 DEG C or more；
Step 3 after 6~10% ammonium hydroxide is sprayed into flue, carries out atomization process, the ammonium hydroxide and step 2 of vaporization in flue
Obtained high-temperature flue gas mixing, the molar ratio for obtaining ammonia and NOx is the mixed gas of 1:1；
Mixed gas is passed through static mixer from bottom to up and is mixed again by step 4；
Step 5, again mixed mixed gas enter SCR reaction system, cigarette after deflector and flow straightening grid
Gas is contacted with catalyst from top to bottom, and the nitrogen oxides in ammonia and flue gas is made to carry out denitration reaction；
Step 6 exchanges heat the flue gas after denitration by GGH heat-exchange system, and exhaust temperature is down to 100 DEG C or less high idle discharges
It puts.
Compared with the prior art, the advantages of the present invention are as follows:
The present invention devises a kind of denitrating technique and its system for flue gas in original desulphurization system, make denitrating technique and
Its used equipment is organically combined into a complete process system, passes through the structure of equipment used for denitrating technique
Design and the control of installation parameter, have reached better than required temperature requirement in denitrating technique, to improve whole de-
The elimination of white plume also may be implemented while removing nitrogen oxides in the performance and efficiency of nitre.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram that white system is taken off for sintering device flue gas denitration provided by the invention；
Fig. 2 is the structural schematic diagram of nozzle in one embodiment of the invention；
Fig. 3 is the structural schematic diagram of baffle plate in one embodiment of the invention.
Description of symbols:
1, GGH heat-exchange system, 11, former exhanst gas outlet, 12, neat stress entrance, 13, former smoke inlet, 14, neat stress goes out
Mouthful, 2, hot-blast stove hybrid system, 21, nozzle, 3, ammonium hydroxide direct-injection system, 4, static mixer, 41, baffle plate, 411, steel plate,
412, steel pipe, 413, round steel, 5, SCR reaction system, 51, deflector, 52, flow straightening grid, 6, desulfurizing tower, 7, tapping equipment.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
As shown in Figure 1 to Figure 2, one kind provided in an embodiment of the present invention takes off white system for sintering device flue gas denitration, including
GGH heat-exchange system 1, hot-blast stove hybrid system 2, ammonium hydroxide direct-injection system 3 and SCR reaction system 5, under the GGH heat-exchange system 1
The former smoke inlet 13 in portion connects desulfurizing tower 6, and the former exhanst gas outlet 11 on 1 top of GGH heat-exchange system connects hot-blast stove mixing
System 2, the other end of the hot-blast stove hybrid system 2 are connected to ammonium hydroxide direct-injection system 3, the ammonium hydroxide direct-injection system 3 it is another
End is connected to SCR reaction system 5, and the neat stress that the other end of the SCR reaction system 5 is connected to 1 top of GGH heat-exchange system enters
The neat stress outlet 14 of mouth 12,1 lower part of GGH heat-exchange system is connected to tapping equipment 7；Wherein, the hot-blast stove mixed stocker
Nozzle 21 is provided in system 2 on flue, the distance between the spout central of the nozzle 21 and flue center are flue width
9~16%.
In the above-mentioned technical solutions:
GGH heat-exchange system 1: being able to maintain that the heat balance of flue gas, and the heat of system is adequately utilized, heat is reduced
Supplement；
Hot-blast stove hybrid system 2: can be improved flue-gas temperature, and denitration reaction is made just to be in the optimum response window of catalyst
Mouth carries out, and realizes that system temperature is being catalyzed in reaction range, while adjusting the size of hot-blast stove power output, catalyst institute is adjusted flexibly
The temperature needed；
Ammonium hydroxide direct-injection system 3: the first evaporation that previous ammonium hydroxide uses, it is rear to mix, or mixed with air using ammonia, and this
Invention uses double-current spray gun body that ammonium hydroxide at droplet, is vaporized into ammonia by high-temperature flue gas by ammonia atomization.The system includes
Two parts, first is that atomization, second is that mixing, by the mixed flue-gas temperature of hot-blast stove at 320 DEG C or more, atomized liquid
Drop and the contact of flue gas large area, and rapid vaporization；
SCR reaction system 5: flue gas passes through deflector 51 and flow straightening grid 52, enters SCR reactor, flue gas and catalysis
After agent reaction, neat stress high altitude discharge after the cooling of GGH heat-exchange system 1.
This system committed step is in the mixing of hot blast stove system and former flue gas, is in particular in the structure design of spout
And installation site.If spout high-temperature region occurs in center, flue gas mixed effect, flue gas two sides, if during spout deviates very much
The heart, flue gas have apparent high temperature near-wall air curtain, by numerical value calculating and engineering verification, the installation site and design form shadow of spout
Entirety denitration performance is rung, so that the flue-gas temperature into reactor is more uniform, further to mention to improve flue-gas temperature deviation
High denitration performance, most preferably, the distance between the spout central of the nozzle 21 and flue center are flue width
10%.
Specifically, the spout of the nozzle 21 is square opening channel-shaped.
Specifically, the nozzle 21 is in horn mouth formula, and horn mouth bevel edge angle is 45 °.
Specifically, the SCR reaction system 5 is disposed with deflector 51 and flow straightening grid along airintake direction in entrance
52。
Specifically, it is provided with double-current spray gun body in the ammonium hydroxide direct-injection system 3, so that ammonia atomization, because of the ammonium hydroxide of penetrating
Droplet is smaller, and ammonium hydroxide rapid vaporization is simultaneously mixed with high-temperature flue gas.
In order to mix flue gas further, it is additionally provided between the ammonium hydroxide direct-injection system 3 and SCR reaction system 5 quiet
State mixer 4, purpose mixes ammonia with high-temperature flue gas, and the mixing of reduction ammonia and oxides of nitrogen gas is non-uniform to ask
Topic.
In order to make mixed gas by the turbulent area to be sufficiently mixed and slow down its flow velocity, in the static mixer 4
It is provided at least one turbulent area.
Specifically, the static mixer 4 is folded plate type static mixer 4, and at least one is provided in static mixer 4
Layer baffle plate 41.Embodiment when as a specific implementation, baffle plate 41 are made of the folded plate of cross-lapping, as shown in figure 3,
Steel plate 411 and the first assembly welding of steel pipe 412 guarantee between steel pipe 412 and round steel 413 through on round steel 413 again when building site is installed
Relative position, flue gas changes airflow direction when passing through folded plate, several strands of airflow collisions, so as to increase collision several for ammonia and flue gas
Rate improves ammonia mixing efficiency.
Present invention process using high-temperature flue gas discharge, therefore take into account sintering device flue gas take off it is white, this method be based on it is described above
One kind take off white system for sintering device flue gas denitration, comprising the following steps:
Step 1 makes the flue gas to be processed after desulfurization exchange heat by GGH heat-exchange system 1, and desulfurization outlet temperature is warming up to
250℃；
Step 2, will heat up after flue gas mixed with the flue gas from hot-blast stove hybrid system 2, the flue gas of denitration is heated up
To 320 DEG C or more, guarantee the supplement of after-heat by hot-blast stove hybrid system 2, reach 320 DEG C or more, guarantees in step 5
The catalytic action of catalyst is complete；
Step 3 after 6~10% ammonium hydroxide is sprayed into flue, carries out atomization process, the ammonium hydroxide and step 2 of vaporization in flue
Obtained high-temperature flue gas mixing, the molar ratio for obtaining ammonia and NOx is the mixed gas of 1:1；
Mixed gas is passed through static mixer 4 from bottom to up and is mixed again by step 4；
Step 5, again mixed mixed gas enter SCR reaction system after deflector 51 and flow straightening grid 52
System 5, flue gas are contacted with catalyst from top to bottom, and the nitrogen oxides in ammonia and flue gas is made to carry out denitration reaction；Denitration reaction are as follows:
4NO+4NH3+O2→4N2+6H2O,
6NO2+8NH3→7N2+12H2O,
It can effectively remove by the nitrogen oxides in the discharged flue gas of sintering machine in sintering plant, with actual amount of the invention
Measured value calculates, and the value of flue gas to be processed measured by inlet is 300ppm,
When the distance between the spout central of nozzle 21 and flue center be flue width 9% when, use and pass through this
Value after the method and system processing of invention measured by exit is 48ppm, is computed and significantly reaches denitrification rate 84%；
When the distance between the spout central of nozzle 21 and flue center be flue width 10% when, use and pass through this
Value after the method and system processing of invention measured by exit is 40ppm, is computed and significantly reaches denitrification rate 86%；
When the distance between the spout central of nozzle 21 and flue center be flue width 16% when, use and pass through this
Value after the method and system processing of invention measured by exit is 54ppm, is computed and significantly reaches denitrification rate 82%；
Step 6 exchanges heat the flue gas after denitration by GGH heat-exchange system 1, and exhaust temperature is down to 100 DEG C or less high-altitudes
Discharge, to eliminate white cigarette.
Disclosed above is only several specific embodiments of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (10)
1. one kind takes off white system for sintering device flue gas denitration, it is characterised in that: including GGH heat-exchange system, hot-blast stove mixed stocker
System, ammonium hydroxide direct-injection system and SCR reaction system, the former smoke inlet of GGH heat-exchange system lower part connects desulfurizing tower, described
The former exhanst gas outlet on GGH heat-exchange system top connects hot-blast stove hybrid system, the other end connection of the hot-blast stove hybrid system
To ammonium hydroxide direct-injection system, the other end of the ammonium hydroxide direct-injection system is connected to SCR reaction system, the SCR reaction system it is another
One end is connected to the neat stress entrance on GGH heat-exchange system top, and the neat stress of GGH heat-exchange system lower part exports the row of being connected to
Put device；Wherein, nozzle is provided in the hot-blast stove hybrid system on flue, in the spout central and flue of the nozzle
The distance between heart is the 9~16% of flue width.
2. one kind according to claim 1 takes off white system for sintering device flue gas denitration, it is characterised in that: the nozzle
The distance between spout central and flue center are the 10% of flue width.
3. one kind according to claim 1 takes off white system for sintering device flue gas denitration, it is characterised in that: the nozzle
Spout is square opening channel-shaped.
4. a kind of white system is taken off for sintering device flue gas denitration according to claim 1, it is characterised in that: the nozzle is in
Horn mouth formula, and horn mouth bevel edge angle is 45 °.
5. one kind according to claim 1 takes off white system for sintering device flue gas denitration, it is characterised in that: the SCR is anti-
System is answered to be disposed with deflector and flow straightening grid along airintake direction in entrance.
6. one kind according to claim 1 takes off white system for sintering device flue gas denitration, it is characterised in that: the ammonium hydroxide is straight
Double-current spray gun body is provided in spray system, so that ammonia atomization.
7. one kind according to claim 1 takes off white system for sintering device flue gas denitration, it is characterised in that: the ammonium hydroxide is straight
Static mixer is additionally provided between spray system and SCR reaction system.
8. one kind according to claim 7 takes off white system for sintering device flue gas denitration, it is characterised in that: described static mixed
At least one turbulent area is provided in clutch.
9. one kind according to claim 7 or 8 takes off white system for sintering device flue gas denitration, it is characterised in that: described quiet
State mixer is folded plate type static mixer, and at least one layer of baffle plate is provided in static mixer.
10. one kind takes off whitening method for sintering device flue gas denitration, which is characterized in that it is any one that this method is based on claim 1 to 9
One kind described in takes off white system for sintering device flue gas denitration, comprising the following steps:
Step 1 makes the flue gas to be processed after desulfurization exchange heat by GGH heat-exchange system, and desulfurization outlet temperature is warming up to 250
℃；
Step 2, will heat up after flue gas mixed with the flue gas from hot-blast stove hybrid system, the flue gas of denitration is warming up to 320
DEG C or more；
Step 3 after 6~10% ammonium hydroxide is sprayed into flue, carries out atomization process in flue, ammonium hydroxide and the step 2 of vaporization obtain
High-temperature flue gas mixing, the molar ratio for obtaining ammonia and NOx is the mixed gas of 1:1；
Mixed gas is passed through static mixer from bottom to up and is mixed again by step 4；
Step 5, again mixed mixed gas enter SCR reaction system after deflector and flow straightening grid, flue gas from
On contacted down with catalyst, so that the nitrogen oxides in ammonia and flue gas is carried out denitration reaction；
Step 6 exchanges heat the flue gas after denitration by GGH heat-exchange system, and exhaust temperature is down to 100 DEG C or less high altitude discharges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345627.5A CN109316963A (en) | 2018-11-13 | 2018-11-13 | One kind taking off white system and method for sintering device flue gas denitration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811345627.5A CN109316963A (en) | 2018-11-13 | 2018-11-13 | One kind taking off white system and method for sintering device flue gas denitration |
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| Publication Number | Publication Date |
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| CN109316963A true CN109316963A (en) | 2019-02-12 |
Family
ID=65260893
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| CN201811345627.5A Pending CN109316963A (en) | 2018-11-13 | 2018-11-13 | One kind taking off white system and method for sintering device flue gas denitration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109821415A (en) * | 2019-02-20 | 2019-05-31 | 山东莱钢永锋钢铁有限公司 | A kind of coal-burning boiler SCR denitrating flue gas two-fluid heat gun system |
| CN114314657A (en) * | 2022-02-18 | 2022-04-12 | 郑州德凯科技有限公司 | Production device and method for continuously preparing arsenic trioxide |
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| CN114314657B (en) * | 2022-02-18 | 2023-09-22 | 郑州德凯科技有限公司 | Production device and method for continuously preparing arsenic trioxide |
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