CN204313293U - A kind of flue-gas desulfurizing device - Google Patents

A kind of flue-gas desulfurizing device Download PDF

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CN204313293U
CN204313293U CN201420837118.5U CN201420837118U CN204313293U CN 204313293 U CN204313293 U CN 204313293U CN 201420837118 U CN201420837118 U CN 201420837118U CN 204313293 U CN204313293 U CN 204313293U
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connects
desulfurizing tower
tower
valve
reaction tower
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吴浩仑
杨青
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WUXI HUAXING ELECTRIC POWER ENVIRONMENTAL PROTECTION MANUFACTURING Co Ltd
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WUXI HUAXING ELECTRIC POWER ENVIRONMENTAL PROTECTION MANUFACTURING Co Ltd
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Abstract

A kind of flue-gas desulfurizing device, comprise coal-burning boiler, electronic air inlet valve, reaction tower, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, it is characterized in that: described coal-burning boiler is linked in sequence electronic air inlet valve, reaction tower, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, connecting bypass pipeline between described coal-burning boiler and electronic air inlet valve import, by-pass line is connected with chimney import, by-pass line is provided with by-passing valve, described electronic air inlet valve outlet is connected with reaction tower air intake, reaction tower air intake bottom is connected with taper ash collection slot, taper ash collection slot connects electric cinder valve, reaction tower air intake top is connected with trunnion, the trunnion top calcium hydroxide that has been linked in sequence dusts mouth, water jet, water jet top is connected with exhanst gas outlet.It is high that the utility model has desulfuration efficiency, and investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, the advantages such as floor space is little, system long service life.

Description

A kind of flue-gas desulfurizing device
Technical field
The utility model relates to a kind of flue-gas desulfurizing device, specifically for the flue gas that purification coal-burning boiler produces, belongs to environmental technology field.
Background technology
At present, containing sulphur in the coal dust that coal-burning boiler is used, in 1200 DEG C ~ 1500 DEG C high-temperature firing processes, the sulphur in raw material generates SO through chemical reaction 2enter flue gas, the SO of discharged from coal-fired boiler 2account for domestic SO 2a big chunk of total emission volumn, according to the analysis to fire coal boiler fume, has following features:
(1) in fire coal boiler fume, SO2 change in concentration is quickly and fluctuation of concentration amplitude is large;
(2) flue-gas temperature of discharged from coal-fired boiler fluctuates usually between 120 DEG C ~ 160 DEG C;
(3) dust concentration in fire coal boiler fume is substantially at 15g/Nm 3to 30g/Nm 3between change;
(4) oxygen content of flue gas discharged from coal-fired boiler changes between 5% ~ 8%;
(5) water capacity of flue gas discharged from coal-fired boiler is comparatively large, usually fluctuates between 8% ~ 10.5%.
In sum, the flue-gas temperature of coal-burning boiler is mostly between 120 ~ 160 DEG C, and residing flue gas environmental condition is relatively more severe, and oxygen content that is as higher in dust concentration, flue gas is higher, water capacity is comparatively large, heavy metal concentration is more high, when adopting sulphur coal, fire coal boiler fume SO 2concentration of emission reach 5000 ~ 6000mg/Nm 3, only adopt primary cycle dry desulfurization, desulfurization degree can only reach 90%, can not reach SO 2concentration of emission < 50mg/Nm 3discharge standard.
Summary of the invention
The utility model, for the problems referred to above, provides a kind of flue-gas desulfurizing device, and one-level adopts circulation dry desulfurization, and doctor solution consumption is few and utilization rate is high, and desulfurization degree is up to 90%; Secondary adopts spray wet desulfurizing process, non-blind area, and desulfuration efficiency is up to more than 95%; Have desulfuration efficiency high, investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, the advantages such as floor space is little, system long service life, SO 2concentration of emission 30mg/Nm 3, dust emission concentration 15mg/Nm 3, be better than GB13223-2011 standard " fossil-fuel power plant atmospheric pollutant emission standard " (SO 2< 50mg/Nm 3, dust emission concentration < 20mg/Nm 3), make flue gas qualified discharge, avoid environment.
The technical solution of the utility model is: a kind of flue-gas desulfurizing device, comprise coal-burning boiler, electronic air inlet valve, reaction tower, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, it is characterized in that: described coal-burning boiler is linked in sequence electronic air inlet valve, reaction tower, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, connecting bypass pipeline between described coal-burning boiler and electronic air inlet valve import, by-pass line is connected with chimney import, by-pass line is provided with by-passing valve, described electronic air inlet valve outlet is connected with reaction tower air intake, reaction tower air intake bottom is connected with taper ash collection slot, taper ash collection slot connects electric cinder valve, reaction tower air intake top is connected with trunnion, the trunnion top calcium hydroxide that has been linked in sequence dusts mouth, water jet, water jet top is connected with exhanst gas outlet, exhanst gas outlet connects sack cleaner, sack cleaner bottom is connected with air flume, middle pressure roots blower is connected with bottom air flume, air flume side coupled reaction tower circulating line, reaction tower circulating line one tunnel connects 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, reaction tower calcium hydroxide dusts mouth by calcium hydroxide playpipe connection mixture generator, mixture generator one tunnel connects high pressure roots blower fan, frequency conversion rotary feeder is connected above mixture generator, frequency conversion rotary feeder connects electron helical and claims, electron helical claims to connect discharger, discharger connects calcium hydroxide dry powder feed bin, reaction tower water jet connects water pump by pipeline, water pump connects water tank, described main air blower import one tunnel is connected with sack cleaner, sack cleaner by-pass line of separately leading up to is connected with by-pass line, sack cleaner by-pass line is provided with bypass valve of bag dust collector, the outlet of described main air blower is leaded up to desulfurizing tower by-pass line and is connected with by-pass line, desulfurizing tower by-pass line is provided with desulfurizing tower by-passing valve, another road is connected with desulfurizing tower electronic air inlet valve, desulfurizing tower electronic air inlet valve is connected with desulfurizing tower air intake, desulfurizing tower air intake lower sides is provided with PH detection control instrument, PH detection control instrument is connected with desulfur pump by control cables, desulfurizing tower air intake bottom connects aeration displacement reaction pond by pipeline, aeration displacement reaction pond connects sedimentation basin, side, aeration displacement reaction pond is provided with roots blower, opposite side is provided with calcium hydroxide feed bin, calcium hydroxide feed bin connects discharger, discharger connects electron helical and claims, electron helical claims to connect frequency conversion rotary feeder, frequency conversion rotary feeder connects aeration displacement reaction pond, aeration displacement reaction pond pool side is provided with aeration displacement reaction pond PH detection control instrument, aeration displacement reaction pond PH detection control instrument is connected with frequency conversion rotary feeder by control cables, sedimentation basin connects regulating reservoir, sedimentation basin bottom is provided with the outer discharge pipe of waste liquid, regulating reservoir opposite side is provided with NaOH storage tank, regulating reservoir pool side is provided with regulating reservoir PH detection control instrument, regulating reservoir PH detection control instrument is connected with electric charging valve by control cables, desulfurizing tower air intake top is provided with nozzle, nozzle top is provided with demister, demister top is provided with exhanst gas outlet, exhanst gas outlet connects dehumidifying purifying column, damp proof air cleaner is provided with in dehumidifying purifying column, the outer discharge pipe of dehumidifying purifying column waste liquid is provided with bottom dehumidifying purifying column, nozzle is connected with the hose adapter of desulfurizing tower outer wall through desulfurizing tower inwall, hose adapter is connected with shower, shower is fixed on desulfurizing tower outer wall by support, shower is connected with feed tube, feed tube is connected with desulfur pump, desulfur pump connects regulating reservoir.
The beneficial effects of the utility model are: the utility model one-level adopts circulation dry desulfurization, doctor solution consumption is few and utilization rate is high, and in cyclic process, sorbent particle is under mutual rubbing action, constantly the exposed surface that makes new advances, desulphurization reaction is constantly carried out fully, and desulfurization degree is up to 90%; Secondary adopts spray wet desulfurizing process, non-blind area, and desulphurization reaction is constantly carried out fully, and desulfuration efficiency is up to more than 95%; Have desulfuration efficiency high, investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, the advantages such as floor space is little, system long service life, SO 2concentration of emission 30mg/Nm 3, dust emission concentration 15mg/Nm 3, be better than GB13223-2011 standard " fossil-fuel power plant atmospheric pollutant emission standard " (SO 2< 50mg/Nm 3, dust emission concentration < 20mg/Nm 3), make flue gas qualified discharge, avoid environment.
Compared with prior art, the utility model tool have the following advantages, economic effect:
1) one-level adopts circulation dry desulfurization, and doctor solution consumption is few and utilization rate is high, and in cyclic process, sorbent particle is under mutual rubbing action, constantly the exposed surface that makes new advances, and desulphurization reaction is constantly carried out fully, and desulfurization degree is up to 90%.
2) secondary adopts spray wet desulfurizing process, and non-blind area, desulphurization reaction is constantly carried out fully, and desulfuration efficiency is up to more than 95%.
3) NaOH consumes fewer, and after the circulation of Systemic absorption liquid, in fact main consumption is calcium hydroxide, and operating cost is low.
4) be provided with special efficient dehydration demister, dehydration, demist is effective.
5) system cloud gray model adopts controlled circulation liquid pH value control method to guarantee system stable operation.
6) liquid-gas ratio is little, and investment, operating cost is low, and system is anticorrosion, anti-wear performance is reliable, long service life.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is A-A profile in Fig. 1.
Fig. 3 is B-B profile in Fig. 1.
Fig. 4 is C magnified partial view in Fig. 1.
Fig. 1, Fig. 2, Fig. 3, in Fig. 4, 1. coal-burning boiler, 2. electronic air inlet valve, 3. reaction tower air intake, 4. taper ash collection slot, 5. electric cinder valve, 6. trunnion, 7. calcium hydroxide dusts mouth, 8. reaction tower, 9. exhanst gas outlet, 10. recycle feed valve, 11. reaction tower circulating lines, 12. ash silo motor-driven valves, 13. ash silos, 14. electric cinder valves, 15. sack cleaners, 16. air flumes, roots blower is pressed in 17., 18. calcium hydroxide playpipes, 19. calcium hydroxide dry powder feed bins, 20. dischargers, 21. electron helicals claim, 22. frequency conversion rotary feeders, 23. high pressure roots blower fans, 24. mixture generators, 25. main air blowers, 26. desulfurizing tower by-passing valves, 27. desulfurizing tower electronic air inlet valves, 28. desulfurizing tower air intakes, 29. desulfurizing towers, 30. demisters, 31. exhanst gas outlets, 32. showers, 33. supports, 34. hose adapters, 35. nozzles, 36. feed tubes, 37. damp proof air cleaners, 38. dehumidifying purifying columns, 39. chimneys, 40. calcium hydroxide feed bins, 41. dischargers, 42. electron helicals claim, 43. frequency conversion rotary feeders, 44. aeration displacement reaction ponds, 45. aeration displacement reaction pond PH detection control instrument, 46. roots blowers, 47.PH detection control instrument, 48. desulfur pumps, 49. sedimentation basins, the outer discharge pipe of 50. waste liquids, the outer discharge pipe of 51. dehumidifying purifying column waste liquid, 52. NaOH storage tanks, 53. electric charging valves, 54. regulating reservoir PH detection control instrument, 55. regulating reservoirs, 56. water tanks, 57. water pumps, 58. water jets, 59. by-passing valves, 60. by-pass lines, 61. bypass valve of bag dust collector, 62. sack cleaner by-pass lines, 63. desulfurizing tower by-pass lines.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further described.
As Fig. 1, Fig. 2, Fig. 3, shown in Fig. 4, the utility model is a kind of flue-gas desulfurizing device, comprise coal-burning boiler 1, electronic air inlet valve 2, reaction tower 8, sack cleaner 15, main air blower 25, desulfurizing tower 29, dehumidifying purifying column 38, chimney 39, it is characterized in that: described coal-burning boiler 1 is linked in sequence electronic air inlet valve 2, reaction tower 8, sack cleaner 15, main air blower 25, desulfurizing tower 29, dehumidifying purifying column 38, chimney 39, connecting bypass pipeline 60 between described coal-burning boiler 1 and electronic air inlet valve 2 import, by-pass line 60 is connected with chimney 39 import, by-pass line 60 is provided with by-passing valve 59, described electronic air inlet valve 2 outlet is connected with reaction tower air intake 3, reaction tower air intake 3 bottom is connected with taper ash collection slot 4, taper ash collection slot 4 connects electric cinder valve 5, reaction tower air intake 3 top is connected with trunnion 6, the trunnion 6 top calcium hydroxide that has been linked in sequence dusts mouth 7, water jet 58, water jet 58 top is connected with exhanst gas outlet 9, exhanst gas outlet 9 connects sack cleaner 15, sack cleaner 15 bottom is connected with air flume 16, middle pressure roots blower 17 is connected with bottom air flume 16, air flume 16 side coupled reaction tower circulating line 11, reaction tower circulating line 11 1 tunnel connects recycle feed valve 10, another road connects ash silo motor-driven valve 12, ash silo motor-driven valve 12 connects ash silo 13, ash silo 13 bottom connects electric cinder valve 14, the reaction tower calcium hydroxide mouth 7 that dusts connects mixture generator 24 by calcium hydroxide playpipe 18, mixture generator 24 1 tunnel connects high pressure roots blower fan 23, frequency conversion rotary feeder 22 is connected above mixture generator 24, frequency conversion rotary feeder 22 connects electron helical and claims 21, electron helical claims 21 connection dischargers 20, discharger 20 connects calcium hydroxide dry powder feed bin 19, reaction tower water jet 58 connects water pump 57 by pipeline, water pump 57 connects water tank 56, described main air blower 25 import one tunnel is connected with sack cleaner 15, sack cleaner by-pass line 62 of separately leading up to is connected with by-pass line 60, sack cleaner by-pass line 62 is provided with bypass valve of bag dust collector 61, the outlet of described main air blower 25 is leaded up to desulfurizing tower by-pass line 63 and is connected with by-pass line 60, desulfurizing tower by-pass line 63 is provided with desulfurizing tower by-passing valve 26, another road is connected with desulfurizing tower electronic air inlet valve 27, desulfurizing tower electronic air inlet valve 27 is connected with desulfurizing tower air intake 28, desulfurizing tower air intake 28 lower sides is provided with PH detection control instrument 47, PH detection control instrument 47 is connected with desulfur pump 48 by control cables, desulfurizing tower air intake 28 bottom connects aeration displacement reaction pond 44 by pipeline, aeration displacement reaction pond 44 connects sedimentation basin 49, side, aeration displacement reaction pond 44 is provided with roots blower 46, opposite side is provided with calcium hydroxide feed bin 40, calcium hydroxide feed bin 40 connects discharger 41, discharger 41 connects electron helical and claims 42, electron helical claims 42 connection frequency conversion rotary feeders 43, frequency conversion rotary feeder 43 connects aeration displacement reaction pond 44, aeration displacement reaction pond 44 pool side is provided with aeration displacement reaction pond PH detection control instrument 45, aeration displacement reaction pond PH detection control instrument 45 is connected with frequency conversion rotary feeder 43 by control cables, sedimentation basin 49 connects regulating reservoir 55, sedimentation basin 49 bottom is provided with the outer discharge pipe 50 of waste liquid, regulating reservoir 55 opposite side is provided with NaOH storage tank 52, regulating reservoir 55 pool side is provided with regulating reservoir PH detection control instrument 54, regulating reservoir PH detection control instrument 54 is connected with electric charging valve 53 by control cables, desulfurizing tower air intake 28 top is provided with nozzle 35, nozzle 35 top is provided with demister 30, demister 30 top is provided with exhanst gas outlet 31, exhanst gas outlet 31 connects dehumidifying purifying column 38, damp proof air cleaner 37 is provided with in dehumidifying purifying column 38, the outer discharge pipe 51 of dehumidifying purifying column waste liquid is provided with bottom dehumidifying purifying column 38, nozzle 35 is connected with the hose adapter 34 of desulfurizing tower 29 outer wall through desulfurizing tower 29 inwall, hose adapter 34 is connected with shower 32, shower 32 is fixed on desulfurizing tower 29 outer wall by support 33, shower 32 is connected with feed tube 36, feed tube 36 is connected with desulfur pump 48, desulfur pump 48 connects regulating reservoir 55.
The course of work of the present utility model: 170t/h coal-burning boiler 1, exhaust gas volumn 380000m 3/ h, flue-gas temperature 120 ~ 160 DEG C, SO 2concentration 6000mg/Nm 3, dust concentration 30g/Nm 3, oxygen content is 5% ~ 8%, and coal-burning boiler 1 flue gas enters reaction tower 8 by the suction function of main air blower 25, is accelerated after flue gas enters reaction tower 8 at trunnion 6 place, and high velocity air forms strong turbulent flow in reaction tower 8, produces efficient sufficient gas-solid contact; Through desulfurization process containing high concentrate dust flue gas from reaction tower 8 top exhanst gas outlet 9 out after, udst separation is carried out in the sack cleaner 15 entering rear portion, flue gas through purification flows out sack cleaner 15, enter desulfurizing tower 29, damp proof air cleaner 37 in dehumidifying purifying column 38, collects the fine solid particle in gas, purifies air again, further removal water droplet, is finally discharged in air by chimney 39;
Claim 21 by calcium hydroxide dry powder feed bin 19, discharger 20, electron helical, calcium hydroxide injection apparatus that frequency conversion rotary feeder 22, high pressure roots blower fan 23, mixture generator 24, calcium hydroxide playpipe 18 etc. form, according to the exhaust gas volumn of coal-burning boiler 1 and the amount of generation sulfide, calculate Ca (OH) 2consumption, claim after 21 Weighings through electron helical, by frequency conversion rotary feeder 22, according to operating mode, powder delivering amount is adjusted by the mode changing rotating speed, powder delivering amount sends into blender 24, from the wind-force of high pressure roots blower fan 23, the powder falling into blender 24 is sent into the calcium hydroxide mouth 7 that dusts by calcium hydroxide playpipe 18 to be entered in reaction tower 8, in reaction tower 8, spread in calcium hydroxide particle in flue gas under mutual rubbing action, constantly (Asia) calcium sulfate of calcium hydroxide particle Surface Creation is removed, make the calcium hydroxide of the granule interior constantly exposed surface that makes new advances, desulphurization reaction is constantly gone on fully, SO in flue gas 2removal efficiency can reach 90%, due to SO 3, the sour gas such as HF, HCL compares SO 2easier and calcium hydroxide reacts, SO in reaction tower 8 3, HF, HCL removal efficiency can reach more than 98%, in reaction tower 8, reacted calcium hydroxide is by air flume 16, reaction tower circulating line 11 and reaction tower 8 carry out calcium hydroxide iterative cycles, its internal circulating load is controlled by recycle feed valve 10, middle pressure roots blower 17 is provided with bottom air flume 16, calcium hydroxide in air flume 16 is in suspended state all the time, that guarantees to have occurred removes reaction, when after desulfurization operation a period of time, open ash silo motor-driven valve 12, by desulfurization product, dust in flue gas enters ash silo 13, the circulatory system is discharged by electric cinder valve 14, calcium hydroxide induction system is by calcium hydroxide iterative cycles and smoke contacts, circulating ratio reaches 100 ~ 200 times, calcium hydroxide utilization rate is high,
A series of chemical change is there is in above-mentioned technical process:
Ca (OH) 2+ SO 2+ 1/2H 2o → CaSO 3.1/2H 2o ten 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
In reaction tower 8, the drying of mixture is relatively uniform, and recycle hydrogen calcium oxide has fabulous mobility, can guarantee the stable of operating mode in reaction tower 8; The particle becoming thicker in sweetening process because of conglomeration drops in reaction tower taper ash collection slot 4 under gravity, and bottom reaction tower, electric cinder valve 5 is discharged;
Secondary desulfuration reaction on cloth bag: under the effect of negative pressure, Ca (OH) 2powder adsorption forms one deck Ca (OH) on cloth bag surface 2bisque, reacts further with the acid fume gas that contains entering deduster.In course of reaction, adopt deduster import and export pressure differential to control deashing frequency, prescribe a time limit when pressure differential exceedes the upper of setting, deashing is carried out to cloth bag, so that Ca (OH) 2powder is constantly adsorbed on cloth bag surface and contains acid fume solid/liquid/gas reactions.Ca (OH) 2iterative cycles and smoke contacts, Ca (OH) 2utilization rate is high, improves desulfuration efficiency;
When the flue-gas temperature entering sack cleaner 15 exceedes the operating temperature of cloth bag, open by-passing valve 59, open bypass valve of bag dust collector 61, close electronic air inlet valve 2, make flue gas by by-pass line 60, enter sack cleaner by-pass line 62, enter main air blower 25, then enter desulfurizing tower 29, then through dehumidifying purifying column 38 in damp proof air cleaner 37, finally be discharged in air by chimney 39, protection cloth bag;
Sack cleaner 15, coal-burning boiler 1 ash-laden gas is played to the effect of dedusting, efficiency of dust collection reaches 99%, prevent dust from entering desulfurizing tower 29 and produce blocking, coal-burning boiler 1 flue gas through sack cleaner 15 enters desulfurizing tower 29 by the effect of main air blower 25, flue gas from bottom to top, when the nozzle 35 by being laid in the middle part of desulfurizing tower 29, due to gas-liquid counter current, the doctor solution that nozzle 35 is sprayed is fluidized state, gas-liquid is fully contacted, flue gas is after nozzle 35 sprays, water smoke is removed by high efficiency demister 30, in demister 30 exiting flue gas, the concentration of droplet is less than 75mg/m 3, prevent water droplet from corroding chimney 39, then in dehumidifying purifying column 38 damp proof air cleaner 37, collect the fine solid particle in gas, purify air, remove water droplet further, be finally discharged in air by chimney 39,
Adopt NaOH as desulfurization absorbent, desulfurizing agent is squeezed into desulfurizing tower 29 through desulfur pump 48 and fully contacts with flue gas, make the sulfur dioxide in flue gas and desulfurizing agent NaOH carry out reaction and generate Na 2sO 3, from the Na that desulfurizing tower 29 is discharged 2sO 3solution, through aerating oxidation, generates Na 2sO 4, by adding the regeneration of calcium hydroxide to absorbing liquid and the precipitation of solid by-product, through aeration and sodium, the mixed liquor of calcium displacement flows into sedimentation basin 49, supernatant after precipitation Ash Water Separator, send into regulating reservoir 55, in regulating reservoir 55, when pH value is reduced to a certain degree, after measuring the pH value in regulating reservoir 55 by regulating reservoir PH detection control instrument 54, controlling electric charging valve 53 adds in regulating reservoir 55 by constantly supplementary for the NaOH in NaOH storage tank 52, in desulfurizing tower 29, when pH value is reduced to a certain degree, after measuring the pH value in desulfurizing tower 29 by PH detection control instrument 47, in desulfurizing tower 29, desulfurizing agent is added by controlling desulfur pump 48, circulation like this, heavy ash in sedimentation basin 49 is regularly removed, pick up outward transport,
By the conveying device that calcium hydroxide feed bin 40, discharger 41, electron helical claim 42, frequency conversion rotary feeder 43 forms calcium hydroxide, in aeration displacement reaction pond 44, when pH value is reduced to a certain degree, after measuring the pH value in aeration displacement reaction pond 44 by aeration displacement reaction pond PH detection control instrument 45, claim after 42 Weighings through electron helical, by frequency conversion rotary feeder 43, according to the pH value in aeration displacement reaction pond 44, adjust the conveying capacity of calcium hydroxide by the mode changing rotating speed, calcium hydroxide is sent in aeration displacement reaction pond 44;
Desulfurization chemical reaction formula:
SO is absorbed in absorption tower 2:
2NaOH+SO 2→Na 2SO 3+H 2O
Na 2SO 3+SO 2+H 2O→2NaHSO 3
SO will be absorbed 2absorbing liquid deliver to aeration displacement reaction pond 44, carry out the precipitation of the oxidation of inferior sulfate radical, the regeneration of absorbing liquid and solid by-product;
Blast air by roots blower 46, in aeration displacement reaction pond 44, oxidation reaction occurs;
Oxidation reaction: Na 2sO 3+ 0.5O 2→ Na 2sO 4
By adding the regeneration of calcium hydroxide to absorbing liquid and the precipitation of solid by-product;
Displacement reaction: Ca (OH) 2+ Na 2sO 4+ 2H 2o → NaOH+CaSO 42H 2o
Ca(OH) 2+Na 2SO 3→2NaOH+CaSO 3
Ca(OH) 2+2NaHSO 3→Na 2SO 3+CaSO 3·0.5H 2O+0.5H 2O
NaOH and Na of regeneration 2sO 3can recycle Deng desulfurizing agent;
As can be seen here, NaOH consumes fewer here, and after the circulation of Systemic absorption liquid, in fact main consumption is calcium hydroxide, and therefore operating cost is lower;
When desulfurizing tower 29 can not normally run, open desulfurizing tower by-passing valve 26, close desulfurizing tower electronic air inlet valve 27, make flue gas through bag-type dust through main air blower 25, by desulfurizing tower by-pass line 63, then through by-pass line 60, enter chimney 39 and discharge.
As can be seen here, the utility model one-level adopts circulation dry desulfurization, and doctor solution consumption is few and utilization rate is high, and in cyclic process, sorbent particle is under mutual rubbing action, and desulfurization degree is up to 90%; Secondary adopts spray wet desulfurizing process, non-blind area, and desulfuration efficiency is up to more than 95%; Have desulfuration efficiency high, investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, the advantages such as floor space is little, system long service life, SO 2concentration of emission 30mg/Nm 3, dust emission concentration 15mg/Nm 3, be better than GB13223-2011 standard " fossil-fuel power plant atmospheric pollutant emission standard " (SO 2< 50mg/Nm 3, dust emission concentration < 20mg/Nm 3), make flue gas qualified discharge, avoid environment.

Claims (1)

1. a flue-gas desulfurizing device, comprise coal-burning boiler, electronic air inlet valve, reaction tower, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, it is characterized in that: described coal-burning boiler is linked in sequence electronic air inlet valve, reaction tower, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, connecting bypass pipeline between described coal-burning boiler and electronic air inlet valve import, by-pass line is connected with chimney import, by-pass line is provided with by-passing valve, described electronic air inlet valve outlet is connected with reaction tower air intake, reaction tower air intake bottom is connected with taper ash collection slot, taper ash collection slot connects electric cinder valve, reaction tower air intake top is connected with trunnion, the trunnion top calcium hydroxide that has been linked in sequence dusts mouth, water jet, water jet top is connected with exhanst gas outlet, exhanst gas outlet connects sack cleaner, sack cleaner bottom is connected with air flume, middle pressure roots blower is connected with bottom air flume, air flume side coupled reaction tower circulating line, reaction tower circulating line one tunnel connects 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, reaction tower calcium hydroxide dusts mouth by calcium hydroxide playpipe connection mixture generator, mixture generator one tunnel connects high pressure roots blower fan, frequency conversion rotary feeder is connected above mixture generator, frequency conversion rotary feeder connects electron helical and claims, electron helical claims to connect discharger, discharger connects calcium hydroxide dry powder feed bin, reaction tower water jet connects water pump by pipeline, water pump connects water tank, described main air blower import one tunnel is connected with sack cleaner, sack cleaner by-pass line of separately leading up to is connected with by-pass line, sack cleaner by-pass line is provided with bypass valve of bag dust collector, the outlet of described main air blower is leaded up to desulfurizing tower by-pass line and is connected with by-pass line, desulfurizing tower by-pass line is provided with desulfurizing tower by-passing valve, another road is connected with desulfurizing tower electronic air inlet valve, desulfurizing tower electronic air inlet valve is connected with desulfurizing tower air intake, desulfurizing tower air intake lower sides is provided with PH detection control instrument, PH detection control instrument is connected with desulfur pump by control cables, desulfurizing tower air intake bottom connects aeration displacement reaction pond by pipeline, aeration displacement reaction pond connects sedimentation basin, side, aeration displacement reaction pond is provided with roots blower, opposite side is provided with calcium hydroxide feed bin, calcium hydroxide feed bin connects discharger, discharger connects electron helical and claims, electron helical claims to connect frequency conversion rotary feeder, frequency conversion rotary feeder connects aeration displacement reaction pond, aeration displacement reaction pond pool side is provided with aeration displacement reaction pond PH detection control instrument, aeration displacement reaction pond PH detection control instrument is connected with frequency conversion rotary feeder by control cables, sedimentation basin connects regulating reservoir, sedimentation basin bottom is provided with the outer discharge pipe of waste liquid, regulating reservoir opposite side is provided with NaOH storage tank, regulating reservoir pool side is provided with regulating reservoir PH detection control instrument, regulating reservoir PH detection control instrument is connected with electric charging valve by control cables, desulfurizing tower air intake top is provided with nozzle, nozzle top is provided with demister, demister top is provided with exhanst gas outlet, exhanst gas outlet connects dehumidifying purifying column, damp proof air cleaner is provided with in dehumidifying purifying column, the outer discharge pipe of dehumidifying purifying column waste liquid is provided with bottom dehumidifying purifying column, nozzle is connected with the hose adapter of desulfurizing tower outer wall through desulfurizing tower inwall, hose adapter is connected with shower, shower is fixed on desulfurizing tower outer wall by support, shower is connected with feed tube, feed tube is connected with desulfur pump, desulfur pump connects regulating reservoir.
CN201420837118.5U 2014-12-14 2014-12-14 A kind of flue-gas desulfurizing device Expired - Fee Related CN204313293U (en)

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