CN203848703U - Sintering machine flue gas desulfurization and denitrification device - Google Patents
Sintering machine flue gas desulfurization and denitrification device Download PDFInfo
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- CN203848703U CN203848703U CN201420280124.5U CN201420280124U CN203848703U CN 203848703 U CN203848703 U CN 203848703U CN 201420280124 U CN201420280124 U CN 201420280124U CN 203848703 U CN203848703 U CN 203848703U
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- desulfurizing tower
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- ammonia
- sintering machine
- flue gas
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Abstract
A sintering machine flue gas desulfurization and denitrification device comprises a sintering machine, an air box, a cyclone dust collector, a booster fan, a desulfurizing tower, a bag-type dust collector, an SCR reactor, a main fan and a chimney. The sintering machine flue gas desulfurization and denitrification device is characterized in that the sintering machine is sequentially connected with the air box, the cyclone dust collector, the booster fan, the desulfurizing tower, the bag-type dust collector, the SCR reactor, the main fan and the chimney, an outlet of the booster fan is connected with an air inlet of the desulfurizing tower, the upper portion of the air inlet of the desulfurizing tower is connected with a throat pipe, the upper portion of the throat pipe is connected with a powder spray opening of the desulfurizing tower, the upper portion of the powder spray opening is connected with a flue gas outlet, the flue gas outlet is connected with the bag-type dust collector, a catalyst layer is arranged in the middle of the SCR reactor, the upper portion of the SCR reactor is connected with an ammonia gas/air mixer, one branch of the ammonia gas/air mixer is connected with a diluted ammonia gas fan, the other branch of the ammonia gas/air mixer is connected with an ammonia gas buffer groove, and the ammonia gas buffer groove is connected with an ammonia evaporator. The sintering machine flue gas desulfurization and denitrification device has the advantages of being high in desulfurizing and denitrification efficiency, low in investment and operation cost, high in reliability and long in service life.
Description
Technical field
The utility model relates to a kind of desulphurization denitration equipment of flue gas, especially relates to a kind of flue gas of sintering machine denitration device.
Background technology
At present, the coke powder that SINTERING PRODUCTION is used and coal dust are in 1200 DEG C of high-temperature firing processes of sintering machine, and in raw material, sulphur, nitrogen generate SO through chemical reaction
2, NOx enters sinter fume, the SO of sintering machine discharge
2, NOx accounts for domestic SO
2, NOx total emission volumn a big chunk, be the emission source that is only second to thermal power plant, according to the analysis to sinter fume, have following features:
(1) in sinter fume, SO2 change in concentration is very fast and fluctuation of concentration amplitude is large;
(2) flue-gas temperature of sintering discharge fluctuation between 100 DEG C～150 DEG C conventionally;
(3) dust concentration in sinter fume is substantially at 100g/Nm
3to 150g/Nm
3between change;
(4) oxygen content of sintering discharge flue gas changes between 14%～18%, and SO in flue gas
2there is certain corresponding relation in the variation of concentration and the variation of oxygen content: SO when oxygen content is on the low side in flue gas
2concentration is higher; SO when oxygen content is higher in flue gas
2concentration is on the low side;
(5) in coal, approximately contain 0.5～2% nitrogen (by mass), in combustion process, oxidation forms NOx; Concentration is substantially at 300g/Nm
3to 1000g/Nm
3between change;
(6) water capacity of sintering discharge flue gas is larger, fluctuation between 8%～10.5% conventionally.
In sum, the flue-gas temperature of sintering machine is relatively low, mostly between 100～150 DEG C, residing flue gas environmental condition is more severe, oxygen content as higher in dust concentration, flue gas is higher, water capacity is large, heavy metal concentration is more high, in the situation that adopting sulphur coal, sintering device handpiece flue gas SO
2concentration of emission reach 6000～8000mg/Nm
3, NOx concentration reaches 800～1000g/Nm
3, environment is caused to severe contamination, but is not also applicable to the desulphurization denitration equipment of sintering device flue gas at present.
Summary of the invention
The advantages such as the utility model, for the problems referred to above, provides a kind of flue gas of sintering machine denitration device, has desulphurization and denitration efficiency high, and investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, and floor space is little, system long service life.
The technical solution of the utility model is: a kind of flue gas of sintering machine denitration device, comprise sintering machine, bellows, cyclone dust collectors, booster fan, desulfurizing tower, sack cleaner, SCR reactor, main air blower, chimney, it is characterized in that: the described sintering machine bellows that are linked in sequence, cyclone dust collectors, booster fan, desulfurizing tower, sack cleaner, SCR reactor, main air blower, chimney, between described bellows and cyclone dust collectors, be connected with electric control valve, cyclone dust collectors bottom is connected with electric cinder valve, described booster fan outlet is connected with desulfurizing tower air intake, desulfurizing tower air intake bottom is connected with taper ash collection slot, taper ash collection slot connects electric cinder valve, desulfurizing tower air intake top is connected with trunnion, trunnion top is connected with the desulfurizing tower mouth that dusts, mouthful top of dusting is connected with exhanst gas outlet, exhanst gas outlet connects sack cleaner, sack cleaner bottom is connected with air flume, air flume bottom is connected with roots blower, air flume side connects desulfurizing agent circulating line, desulfurizing agent circulating line one tunnel connects desulfurizing agent recycle feed valve, another road connects ash silo motor-driven valve, ash silo motor-driven valve connects ash silo, ash silo bottom connects electric cinder valve, desulfurizing tower dusts and mouthful connects mixture generator by playpipe, mixture generator one tunnel connects roots blower, mixture generator top connects frequency conversion rotary feeder, frequency conversion rotary feeder connecting electronic spiral claims, electron helical claims to connect discharger, discharger connects desulfurizing agent feed bin, in the middle of described SCR reactor, be provided with catalyst layer, SCR reactor top is connected with ammonia/air mixer, ammonia/air mixer one tunnel is connected with dilution ammonia blower fan, another road is connected with ammonia dashpot, ammonia dashpot is connected with ammonia evaporator.
The beneficial effects of the utility model are: the utlity model has the advantages such as desulphurization and denitration efficiency is high, and investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, and floor space is little, system long service life.
Compared with prior art, the utlity model has following advantage, economic effect:
1) doctor solution consumption is few and utilization rate is high, and in cyclic process, sorbent particle is under rubbing action mutually, and constantly the exposed surface that makes new advances, constantly carries out desulphurization reaction fully, and desulfurization degree is up to 95%;
2) reaction tower has been strengthened homogenizing process, has extended the time of desulphurization reaction, has ensured system running quality;
3) in whole sweetening process, operating temperature is higher than dew point, and corrosion or condensation, do not produce without waste water;
4) desulfurizing tower is made of common iron, and without special anti-corrosion measures such as alloy, coating and rubber linings;
5) waste gas is without heating and can discharge again;
6) after SCR reactor is arranged in desulfurizing tower, sack cleaner, in flue gas, most of toxicant and dust remove in desulfurizing tower, sack cleaner, so catalyst life can extend greatly, its working life can reach 3～5 years (working life in the flue gas of " unclean " is 2～3 years), catalyst exhaust gases passes that simultaneously can selection of small, greatly improve the specific area of catalyst, thereby reduce the overall consumption of catalyst, reduce initial cost and catalyst change operating cost.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
In Fig. 1, 1. sintering machine, 2. bellows, 3. electric flow control valve, 4. cyclone dust collectors, 5. electric cinder valve, 6. booster fan, 7. desulfurizing tower air intake, 8. taper ash collection slot, 9. electric cinder valve, 10. trunnion, 11. mouths that dust, 12. desulfurizing towers, 13. exhanst gas outlets, 14. desulfurizing agent recycle feed valves, 15. desulfurizing agent circulating lines, 16. ash silo motor-driven valves, 17. ash silos, 18. electric cinder valves, 19. playpipes, in 20., press roots blower, 21. air flumes, 22. sack cleaners, 23. desulfurizing agent feed bins, 24. discharger 25. electron helicals claim, 26. frequency conversion rotary feeders, 27 high pressure roots blower fans, 28. mixture generators, 29. main air blowers, 30. chimneys, 31. catalyst layers, 32.SCR reactor, 33. dilution ammonia blower fans, 34. ammonias/air mixer, 35. ammonia dashpots, 36. ammonia evaporators.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the utility model is a kind of flue gas of sintering machine denitration device, comprise sintering machine 1, bellows 2, cyclone dust collectors 4, booster fan 6, desulfurizing tower 12, sack cleaner 22, main air blower 29, chimney 30, it is characterized in that: described sintering machine 1 bellows 2 that are linked in sequence, cyclone dust collectors 4, booster fan 6, desulfurizing tower 12, sack cleaner 22, main air blower 29, chimney 30, between described bellows 2 and cyclone dust collectors 4, be connected with electric control valve 3, cyclone dust collectors 4 bottoms are connected with electric cinder valve 5, described booster fan 6 outlets are connected with desulfurizing tower air intake 7, desulfurizing tower air intake 7 bottoms are connected with taper ash collection slot 8, taper ash collection slot 8 connects electric cinder valve 9, desulfurizing tower air intake 7 tops are connected with trunnion 10, trunnion 10 tops are connected with desulfurizing tower and dust mouthfuls 11, dust mouthful 11 tops are connected with exhanst gas outlet 13, exhanst gas outlet 13 connects sack cleaner 22, sack cleaner 22 bottoms are connected with air flume 21, air flume 21 bottoms are connected with middle pressure roots blower 20, air flume 21 sides connect desulfurizing agent circulating line 15, desulfurizing agent circulating line 15Yi road connects desulfurizing agent recycle feed valve 14, another road connects ash silo motor-driven valve 16, ash silo motor-driven valve 16 connects ash silo 17, ash silo 17 bottoms connect electric cinder valve 18, desulfurizing tower dusts and mouthfuls 11 connects mixture generator 28 by pipeline 19, mixture generator 28Yi road connects high pressure roots blower fan 27, mixture generator 28 tops connect frequency conversion rotary feeder 26, frequency conversion rotary feeder 26 connecting electronic spirals claim 25, electron helical claims 25 connection dischargers 24, discharger 24 connects desulfurizing agent feed bin 23, in the middle of described SCR reactor 32, be provided with catalyst layer 31, SCR reactor 32 tops are connected with ammonia/air mixer 34, ammonia/air mixer 34Yi road is connected with dilution ammonia blower fan 33, another road is connected with ammonia dashpot 35, ammonia dashpot 35 is connected with ammonia evaporator 36.
The course of work of the present utility model: 180m
2sintering machine 1, exhaust gas volumn 300000Nm
3/ h, SO
2concentration 7000mg/Nm
3, NOx concentration 900g/Nm
3, dust concentration 100mg/Nm
3, 100～150 DEG C of flue-gas temperatures, sintering machine 1 flue gas enters in bellows 2 by the suction function of main air blower 29, connecting each bellows 2 to main pipeline, be provided with electric flow control valve 3, be used for mating each bellows 2 air quantity, then enter cyclone dust collectors 4, sintering machine 1 flue gas is played to the effect of pre-dedusting, the dust that pre-dedusting is got off is discharged by electric cinder valve 5, sintering machine 1 flue gas through cyclone dust collectors 4 enters desulfurizing tower 12 by the effect of booster fan 6, flue gas is accelerated at trunnion 10 places after entering desulfurizing tower 12, high velocity air is in the strong turbulent flow of the interior formation of desulfurizing tower 12, produce efficient sufficient gas-solid contact, through the flue gas that contains high concentrate dust of desulfurization processing from desulfurizing tower 12 top exhanst gas outlets 13 out, enter in the sack cleaner 22 at rear portion and carry out udst separation, flow out sack cleaner 22 through the flue gas purifying, after SCR reactor 32, enter the outer row of chimney 30 by main air blower 29 and clean flue,
By the injection apparatus that feed bin 23, discharger 24, electron helical claim 25, frequency conversion rotary feeder 26, high pressure roots blower fan 27, mixture generator 28, playpipe 19 etc. form desulfurizing agent, according to the amount of the exhaust gas volumn of sintering machine 1 and generation sulfide, calculate Ca (OH)
2consumption, after electron helical claims 25 Weighings, by frequency conversion rotary feeder 26, according to sintering operating mode, adjust powder delivering amount with changing the mode of rotating speed, powder delivering amount is sent into blender 28, from the wind-force of high pressure roots blower fan 27, the powder that falls into blender 28 is sent into the mouth 11 that dusts by playpipe 19 and enter in desulfurizing tower 12, in desulfurizing tower 12, spread in sorbent particle in flue gas under rubbing action mutually, constantly (Asia) calcium sulfate of calcium hydroxide particle Surface Creation is removed, make the constantly exposed surface that makes new advances of calcium hydroxide of granule interior, desulphurization reaction is constantly gone on fully, the SO in flue gas
2removal efficiency can reach 95%, due to SO
3, the sour gas such as HF, HCL compares SO
2easier and calcium hydroxide reacts, the interior SO of desulfurizing tower 12
3, HF, HCL removal efficiency can reach more than 99%, pass through air flume 21 at the interior reacted desulfurizing agent of desulfurizing tower 12, desulfurizing agent circulating line 15 carries out desulfurizing agent iterative cycles with desulfurizing tower 12, its internal circulating load is controlled by desulfurizing agent recycle feed valve 14, air flume 21 bottoms are provided with middle pressure roots blower 20, by the desulfurizing agent in air flume 21 all the time in suspended state, guarantee the reaction that removes having occurred, when after desulfurization operation a period of time, open ash silo motor-driven valve 16, by desulfurization product, dust in flue gas enters ash silo 17, discharge the circulatory system by electric cinder valve 18, desulfurizing agent induction system contacts desulfurizing agent iterative cycles with flue gas, circulating ratio reaches 100～200 times, sorbent utilization is high.
In above-mentioned technical process, there is a series of chemical change:
Ca(OH)
2+SO
2+1/2H
2O→CaSO
3.1/2H
2O+H
2O
Ca(OH)
2+SO
3+H
2O→CaSO
4.2H
2O
Ca(OH)
2+2HCL→CaCL
2.2H
2O
Ca(OH)
2+2HF→CaF
2.2H
2O
CaSO
3.1/2H
2O+1/2O
2+2/3H
2O→CaSO
4.2H
2O
Ca(OH)
2+CO
2→CaCO
3+H
2O
Desulfurizing tower 12 interior mixtures dry relatively even, circulation desulfurization agent has fabulous mobility, can guarantee the stable of operating mode in desulfurizing tower 12; The particle that becomes thicker because of conglomeration in sweetening process drops in desulfurizing tower taper ash collection slot 8 under the effect of gravity, and through desulfurizing tower bottom, electric cinder valve 9 is discharged.
Secondary desulfuration reaction on cloth bag: under the effect of negative pressure, Ca (OH)
2powder is adsorbed on cloth bag surface and forms one deck Ca (OH)
2bisque, further reacts with the sulfur-containing smoke gas that enters deduster.In course of reaction, adopt deduster import and export pressure differential to control deashing frequency, when exceeding the upper of setting, pressure differential prescribes a time limit, cloth bag is carried out to deashing, so that Ca (OH)
2powder is constantly adsorbed on cloth bag surface and reacts with sulfur-containing smoke gas.Ca (OH)
2iterative cycles contacts with flue gas, Ca (OH)
2utilization rate is high, improves desulfuration efficiency.
Denitrification process: liquefied ammonia is transported to liquid ammonia storage tank by tank car, the liquefied ammonia of output becomes ammonia after ammonia evaporator 36, is delivered to ammonia dashpot 35 for subsequent use; Ammonia in dashpot is sent in ammonia/air mixer 34 after decompression, after mixing with from the air of dilution ammonia blower fan 33, spray in flue gas and with it and fully mix by the nozzle of spray ammonia barrier, then enter SCR reactor 32, when smoke gas flow is during through the catalyst layer 31 of SCR reactor 32, catalytic reaction occurs, and NOx is by selective reduction:
4NH
3+4NO+O
2→4N
2+6H
2O
8NH
3+6NO
2→7N
2+12H
2O
In reactor, NOx is reduced to N
2and water.
The maximum feature of this equipment is to utilize the calcium-based desulfurizing agent of powdery (Ca (OH)
2) with sack cleaner collect circulation desulfurization agent together with, be transported in the dry tower of concentrated phase by air flume, the desulfurizing agent of the sulfuric acid gas in desulfurizing tower in flue gas and a large amount of high concentrations is at suspended state generation desulphurization reaction; In the flue gas that has catalyst, inject ammonia and make reducing agent NOx is reduced, in reactor, NOx is reduced to N
2and water.
With 180m
2flue gas of sintering machine denitrating technique is example, and the utility model and conventional equipment comparison, be described as follows:
Note: work per year and calculate for 330th.
As can be seen here, the utlity model has the advantages such as denitrification efficiency is high, and investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, and floor space is little, system long service life.
Claims (1)
1. a flue gas of sintering machine denitration device, comprise sintering machine, bellows, cyclone dust collectors, booster fan, desulfurizing tower, sack cleaner, SCR reactor, main air blower, chimney, it is characterized in that: the described sintering machine bellows that are linked in sequence, cyclone dust collectors, booster fan, desulfurizing tower, sack cleaner, SCR reactor, main air blower, chimney, between described bellows and cyclone dust collectors, be connected with electric control valve, cyclone dust collectors bottom is connected with electric cinder valve, described booster fan outlet is connected with desulfurizing tower air intake, desulfurizing tower air intake bottom is connected with taper ash collection slot, taper ash collection slot connects electric cinder valve, desulfurizing tower air intake top is connected with trunnion, trunnion top is connected with the desulfurizing tower mouth that dusts, mouthful top of dusting is connected with exhanst gas outlet, exhanst gas outlet connects sack cleaner, sack cleaner bottom is connected with air flume, air flume bottom is connected with roots blower, air flume side connects desulfurizing agent circulating line, desulfurizing agent circulating line one tunnel connects desulfurizing agent recycle feed valve, another road connects ash silo motor-driven valve, ash silo motor-driven valve connects ash silo, ash silo bottom connects electric cinder valve, desulfurizing tower dusts and mouthful connects mixture generator by playpipe, mixture generator one tunnel connects roots blower, mixture generator top connects frequency conversion rotary feeder, frequency conversion rotary feeder connecting electronic spiral claims, electron helical claims to connect discharger, discharger connects desulfurizing agent feed bin, in the middle of described SCR reactor, be provided with catalyst layer, SCR reactor top is connected with ammonia/air mixer, ammonia/air mixer one tunnel is connected with dilution ammonia blower fan, another road is connected with ammonia dashpot, ammonia dashpot is connected with ammonia evaporator.
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|---|---|---|---|
| CN201420280124.5U CN203848703U (en) | 2014-05-24 | 2014-05-24 | Sintering machine flue gas desulfurization and denitrification device |
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|---|---|---|---|
| CN201420280124.5U CN203848703U (en) | 2014-05-24 | 2014-05-24 | Sintering machine flue gas desulfurization and denitrification device |
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|---|---|
| CN203848703U true CN203848703U (en) | 2014-09-24 |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106880996A (en) * | 2017-03-28 | 2017-06-23 | 中国科学院广州能源研究所 | The method of dust and discharged nitrous oxides and the device of the method is realized in a kind of control tail gas |
-
2014
- 2014-05-24 CN CN201420280124.5U patent/CN203848703U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106880996A (en) * | 2017-03-28 | 2017-06-23 | 中国科学院广州能源研究所 | The method of dust and discharged nitrous oxides and the device of the method is realized in a kind of control tail gas |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20180524 |
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| CF01 | Termination of patent right due to non-payment of annual fee |