CN204816205U - Sintering machine flue gas desulfurization denitration equipment - Google Patents
Sintering machine flue gas desulfurization denitration equipment Download PDFInfo
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- CN204816205U CN204816205U CN201520628738.2U CN201520628738U CN204816205U CN 204816205 U CN204816205 U CN 204816205U CN 201520628738 U CN201520628738 U CN 201520628738U CN 204816205 U CN204816205 U CN 204816205U
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Abstract
The utility model provides a sintering machine flue gas desulfurization denitration equipment, includes sintering machine, bellows, flue gas on -line monitoring controlling means, reaction tower, sack cleaner, electronic air inlet valve, desulfurizing tower, dehumidification purifying column, fan, chimney, its characterized in that: bellows, flue gas on -line monitoring controlling means, reaction tower, sack cleaner, electronic air inlet valve, desulfurizing tower, dehumidification purifying column, fan, chimney are connected in proper order to the sintering machine, be connected with electronic flow control valve between bellows and the flue gas on -line monitoring controlling means, flue gas on -line monitoring controlling means connects the PLC control box, and the frequency conversion rotary feeder is connected to the PLC control box, and electron screw scale is connected to frequency conversion rotary feeder top, and electron screw scale connects the tripper. The utility model discloses SO2's effluent concentration 60mgNm3, NOx's effluent concentration 50mgNm3, dust effluent concentration 10mgNm3 makes flue gas discharge to reach standard, avoids causing the pollution to the environment.
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, belongs to environmental technology field.
Background technology
At present, the coke powder that SINTERING PRODUCTION is used and coal dust are in sintering machine 1200 DEG C of high-temperature firing processes, 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 emission total amount a big chunk, be the emission source being only second to thermal power plant, according to the analysis to sinter fume, have following features:
(1) SO in sinter fume
2change in concentration quickly and fluctuation of concentration amplitude is large;
(2) flue-gas temperature of sintering discharge fluctuates usually between 100 DEG C ~ 180 DEG C;
(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 change of concentration and the change 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) nitrogen (by mass) about containing 0.5 ~ 2% in coal, oxidation forms NOx in combustion; Concentration is substantially at 500g/Nm
3to 700g/Nm
3between change;
(6) sintering device flue gas SO
2concentration of emission reach 800 ~ 1500mg/Nm
3;
(7) water capacity of sintering discharge flue gas is comparatively large, usually fluctuates between 8% ~ 10.5%.
In sum, the flue-gas temperature of sintering machine is relatively low, and mostly between 100 ~ 180 DEG C, residing flue gas environmental condition is more severe, oxygen content that is as higher in dust concentration, flue gas is higher, water capacity is comparatively large, heavy metal concentration is more high, sintering device handpiece flue gas SO
2concentration of emission reach 800 ~ 1500mg/Nm
3, NOx concentration reaches 500 ~ 700g/Nm
3, severe contamination is caused to environment, but is not also applicable to the desulphurization denitration equipment of sintering device flue gas at present.
In prior art, denitrating technique is mainly reducing agent with ammoniacal liquor, this medicament device for formulating, after adopting cold water to be heated to design temperature by heater, Manual material feeding, dissolves, and plant automation degree is not high, the continuous to-be to medicament when large exhaust gas volumn removes nitrogen oxide can not be met, cause the waste of manpower and materials; Do not arrange flue gas Online Monitoring Control device, pharmaceutical quantities adds at random, cannot monitor in real time, the denitration effect that can not have guaranteed, waste is serious, and operating cost is high.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, thus a kind of flue gas of sintering machine denitration device is provided, the aqueous solution of urea of preparation sprays in flue as medicament by this equipment, and the nitrogen oxide of medicament preferentially and in flue gas carries out chemical reduction reaction, and in flue, NOx is reduced to N
2and water, thus reach the object reducing discharged nitrous oxides concentration, its automaticity is high, can meet the continuous to-be to medicament when large exhaust gas volumn removes nitrogen oxide, use manpower and material resources sparingly; Flue gas Online Monitoring Control device detects the NOx content in flue gas, and feed back to PLC control system, frequency conversion rotary feeder, entering water electromagnetic valve is controlled after PLC control system calculates, regulate the dosage of urea, water, ensure the concentration of preparating liquid, the denitration effect guaranteed, avoids waste, reduces operating cost; 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 high; Have denitration, desulfuration efficiency is 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 60mg/Nm
3, the concentration of emission 50mg/Nm of NOx
3, dust emission concentration 10mg/Nm
3, the noxious pollutants such as the dioxin in flue gas, heavy metal can be adsorbed, make flue gas qualified discharge, avoid environment.
The technical solution of the utility model is: a kind of flue gas of sintering machine denitration device, comprise sintering machine, bellows, flue gas Online Monitoring Control device, reaction tower, sack cleaner, electronic air inlet valve, desulfurizing tower, dehumidifying purifying column, blower fan, chimney, it is characterized in that: described sintering machine is linked in sequence bellows, flue gas Online Monitoring Control device, reaction tower, sack cleaner, electronic air inlet valve, desulfurizing tower, dehumidifying purifying column, blower fan, chimney, electric flow control valve is connected with between described bellows and flue gas Online Monitoring Control device, described flue gas Online Monitoring Control device connects PLC control cabinet, PLC control cabinet connects frequency conversion rotary feeder, electron helical scale is connected above frequency conversion rotary feeder, electron helical scale connects discharger, discharger connects urea granules feed bin, be connected with jet mixer top below frequency conversion rotary feeder, jet mixer side is by inlet channel and entering water electromagnetic valve, water inlet connects, jet mixer bottom connects dissolves case, dissolve side, box top and be provided with flow of inlet water instrument, flow of inlet water instrument is by inlet channel and entering water electromagnetic valve, water inlet connects, dissolve case inside and be provided with mixer, the motor of mixer is arranged on and dissolves box top, dissolve case inside and be provided with high liquid level gauge, low liquid level gauge and extremely low liquid level gauge, PLC control cabinet by control cables respectively with entering water electromagnetic valve, flow of inlet water instrument, high liquid level gauge, low liquid level gauge, extremely low liquid level gauge, water pump, urea liquid delivery pump connects, dissolve case and connect urea liquid delivery pump by urea liquid conveyance conduit, urea liquid delivery pump connects urea liquid entrance by urea liquid conveyance conduit, atomizer is provided with in the urea liquid conveyance conduit of urea liquid delivery pump and urea liquid entrance, atomizer connects water pump by pipeline, water pump connects water tank by pipeline, urea liquid entrance is positioned on the sidewall of sintering device flue gas main pipeline, described flue gas Online Monitoring Control device 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 connects water pump by pipeline, water pump connects water tank, water jet top is connected with exhanst gas outlet, exhanst gas outlet passes through to connect sack cleaner into sack cleaner pipeline, enter on sack cleaner pipeline and be provided with active carbon entrance, active carbon entrance connects mixture generator by active carbon playpipe, 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 scale, electron helical scale connects discharger, discharger connects active carbon feed bin, sack cleaner bottom connects air flume, roots blower is pressed in connecting 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 scale, electron helical scale connects discharger, discharger connects calcium hydroxide dry powder feed bin, connecting bypass pipeline between described sack cleaner and electronic air inlet valve import, by-pass line is connected with fan inlet, by-pass line is provided with by-passing valve, described electronic air inlet valve outlet 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 scale, electron helical scale connects 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 provides a kind of flue gas of sintering machine denitration device, the aqueous solution of urea of preparation sprays in flue as medicament by this equipment, the nitrogen oxide of medicament preferentially and in flue gas carries out chemical reduction reaction, and in flue, NOx is reduced to N
2and water, thus reach the object reducing discharged nitrous oxides concentration, its automaticity is high, can meet the continuous to-be to medicament when large exhaust gas volumn removes nitrogen oxide, use manpower and material resources sparingly; Flue gas Online Monitoring Control device detects the NOx content in flue gas, and feed back to PLC control system, frequency conversion rotary feeder, entering water electromagnetic valve is controlled after PLC control system calculates, regulate the dosage of urea, water, ensure the concentration of preparating liquid, the denitration effect guaranteed, avoids waste, reduces operating cost; 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 high; Have denitration, desulfuration efficiency is 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 60mg/Nm
3, the concentration of emission 50mg/Nm of NOx
3, dust emission concentration 10mg/Nm
3, the noxious pollutants such as the dioxin in flue gas, heavy metal can be adsorbed, make flue gas qualified discharge, avoid environment.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is A-A place sectional view in Fig. 1.
Fig. 3 is B-B place sectional view in Fig. 1.
Fig. 4 is C place enlarged drawing in Fig. 1.
Fig. 5 is D place enlarged drawing in Fig. 1.
Fig. 6 is E place enlarged drawing in Fig. 1.
Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, in Fig. 6, 1. sintering machine, 2. bellows, 3. reaction tower air intake, 4. taper ash collection slot, 5. electric cinder valve, 6. trunnion, 7. calcium hydroxide dusts mouth, 8. water jet, 9. water pump, 10. water tank, 11. reaction towers, 12. exhanst gas outlets, 13. recycle feed valves, 14. reaction tower circulating lines, 15. ash silo motor-driven valves, 16. ash silos, 17. electric cinder valves, 18. sack cleaners, 19. air flumes, roots blower is pressed in 20., 21. calcium hydroxide dry powder feed bins, 22. dischargers, 23. electron helical scales, 24. frequency conversion rotary feeders, 25. high pressure roots blower fans, 26. mixture generators, 27. calcium hydroxide playpipes, 28. by-passing valves, 29. active carbon feed bins, 30. dischargers, 31. electron helical scales, 32. frequency conversion rotary feeders, 33. high pressure roots blower fans, 34. mixture generators, 35. active carbon playpipes, 36. active carbon entrances, 37. enter sack cleaner pipeline, 38. electronic air inlet valves, 39. blower fans, 40. chimneys, 41. urea granules feed bins, 42. dischargers, 43. electron helical scales, 44. frequency conversion rotary feeders, 45. water inlets, 46. entering water electromagnetic valves, 47. flow of inlet water instrument, 48. mixers, 49. jet mixers, 50. dissolve case, 51. high liquid level gauges, 52. low liquid level gauges, 53. extremely low liquid level gauges, 54. water tanks, 55. water pumps, 56. urea liquid delivery pumps, 57. urea liquid conveyance conduits, 58. atomizers, 59. urea liquid entrances, 60. flue gas Online Monitoring Control devices, 61.PLC control cabinet, 62. electric flow control valves, 63. sintering device flue gas main pipelines, 64. desulfurizing tower air intakes, 65. desulfurizing towers, 66. demisters, 67. exhanst gas outlets, 68. showers, 69. supports, 70. hose adapters, 71. nozzles, 72. feed tubes, 73. damp proof air cleaners, 74. dehumidifying purifying columns, 75. calcium hydroxide feed bins, 76. dischargers, 77. electron helical scales, 78. frequency conversion rotary feeders, 79. aeration displacement reaction ponds, 80. aeration displacement reaction pond pH detection control instrument, 81. roots blowers, 82.pH detection control instrument, 83. desulfur pumps, 84. sedimentation basins, the outer discharge pipe of 85. waste liquids, the outer discharge pipe of 86. dehumidifying purifying column waste liquid, 87. NaOH storage tanks, 88. electric charging valves, 89. regulating reservoir pH detection control instrument, 90. regulating reservoirs.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is further described.
As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, shown in Fig. 6, the utility model is a kind of flue gas of sintering machine denitration device, comprise sintering machine 1, bellows 2, flue gas Online Monitoring Control device 60, reaction tower 11, sack cleaner 18, electronic air inlet valve 38, desulfurizing tower 65, dehumidifying purifying column 74, blower fan 39, chimney 40, it is characterized in that: described sintering machine 1 is linked in sequence bellows 2, flue gas Online Monitoring Control device 60, reaction tower 11, sack cleaner 18, electronic air inlet valve 38, desulfurizing tower 65, dehumidifying purifying column 74, blower fan 39, chimney 40, electric flow control valve 62 is connected with between described bellows 2 and flue gas Online Monitoring Control device 60, described flue gas Online Monitoring Control device 60 connects PLC control cabinet 61, PLC control cabinet 61 connects frequency conversion rotary feeder 44, electron helical scale 43 is connected above frequency conversion rotary feeder 44, electron helical scale 43 connects discharger 42, discharger 42 connects urea granules feed bin 41, be connected with jet mixer 49 top below frequency conversion rotary feeder 44, jet mixer 49 1 sides are by inlet channel and entering water electromagnetic valve 46, water inlet 45 connects, jet mixer 49 bottom connects dissolves case 50, dissolve side, case 50 top and be provided with flow of inlet water instrument 47, flow of inlet water instrument 47 is by inlet channel and entering water electromagnetic valve 46, water inlet 45 connects, dissolve case 50 inside and be provided with mixer 48, the motor of mixer 48 is arranged on and dissolves case 50 top, dissolve case 50 inside and be provided with high liquid level gauge 51, low liquid level gauge 52 and extremely low liquid level gauge 53, PLC control cabinet 61 by control cables respectively with entering water electromagnetic valve 46, flow of inlet water instrument 47, high liquid level gauge 51, low liquid level gauge 52, extremely low liquid level gauge 53, water pump 55, urea liquid delivery pump 56 connects, dissolve case 50 and connect urea liquid delivery pump 56 by urea liquid conveyance conduit 57, urea liquid delivery pump 56 connects urea liquid entrance 59 by urea liquid conveyance conduit 57, atomizer 58 is provided with in urea liquid delivery pump 56 with the urea liquid conveyance conduit 57 of urea liquid entrance 59, atomizer 58 connects water pump 55 by pipeline, water pump 55 connects water tank 54 by pipeline, urea liquid entrance 59 is positioned on the sidewall of sintering device flue gas main pipeline 63, described flue gas Online Monitoring Control device 60 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 8, water jet 8 connects water pump 9 by pipeline, water pump 9 connects water tank 10, water jet 8 top is connected with exhanst gas outlet 12, exhanst gas outlet 12 passes through to connect sack cleaner 18 into sack cleaner pipeline 37, enter on sack cleaner pipeline 37 and be provided with active carbon entrance 36, active carbon entrance 36 connects mixture generator 34 by active carbon playpipe 35, mixture generator 34 1 tunnel connects high pressure roots blower fan 33, frequency conversion rotary feeder 32 is connected above mixture generator 34, frequency conversion rotary feeder 32 connects electron helical scale 31, electron helical scale 31 connects discharger 30, discharger 30 connects active carbon feed bin 29, sack cleaner 18 bottom connects air flume 19, roots blower 20 is pressed in connecting bottom air flume 19, air flume 19 side coupled reaction tower circulating line 14, reaction tower circulating line 14 1 tunnel connects recycle feed valve 13, another road connects ash silo motor-driven valve 15, ash silo motor-driven valve 15 connects ash silo 16, ash silo 16 bottom connects electric cinder valve 17, the reaction tower calcium hydroxide mouth 7 that dusts connects mixture generator 26 by calcium hydroxide playpipe 27, mixture generator 26 1 tunnel connects high pressure roots blower fan 25, frequency conversion rotary feeder 24 is connected above mixture generator 26, frequency conversion rotary feeder 24 connects electron helical scale 23, electron helical scale 23 connects discharger 22, discharger 22 connects calcium hydroxide dry powder feed bin 21, connecting bypass pipeline between described sack cleaner 18 and electronic air inlet valve 38 import, by-pass line is connected with blower fan 39 import, by-pass line is provided with by-passing valve 28, described electronic air inlet valve 38 outlet is connected with desulfurizing tower air intake 64, desulfurizing tower air intake 64 lower sides is provided with pH detection control instrument 82, pH detection control instrument 82 is connected with desulfur pump 83 by control cables, desulfurizing tower air intake 64 bottom connects aeration displacement reaction pond 79 by pipeline, aeration displacement reaction pond 79 connects sedimentation basin 84, side, aeration displacement reaction pond 79 is provided with roots blower 81, opposite side is provided with calcium hydroxide feed bin 75, calcium hydroxide feed bin 75 connects discharger 76, discharger 76 connects electron helical scale 77, electron helical scale 77 connects frequency conversion rotary feeder 78, frequency conversion rotary feeder 78 connects aeration displacement reaction pond 79, aeration displacement reaction pond 79 pool side is provided with aeration displacement reaction pond pH detection control instrument 80, aeration displacement reaction pond pH detection control instrument 80 is connected with frequency conversion rotary feeder 78 by control cables, sedimentation basin 84 connects regulating reservoir 90, sedimentation basin 84 bottom is provided with the outer discharge pipe 85 of waste liquid, regulating reservoir 90 opposite side is provided with NaOH storage tank 87, regulating reservoir 90 pool side is provided with regulating reservoir pH detection control instrument 89, regulating reservoir pH detection control instrument 89 is connected with electric charging valve 88 by control cables, desulfurizing tower air intake 64 top is provided with nozzle 71, nozzle 71 top is provided with demister 66, demister 66 top is provided with exhanst gas outlet 67, exhanst gas outlet 67 connects dehumidifying purifying column 74, damp proof air cleaner 73 is provided with in dehumidifying purifying column 74, the outer discharge pipe 86 of dehumidifying purifying column waste liquid is provided with bottom dehumidifying purifying column 74, nozzle 71 is connected with the hose adapter 70 of desulfurizing tower 65 outer wall through desulfurizing tower 65 inwall, hose adapter 70 is connected with shower 68, shower 68 is fixed on desulfurizing tower 65 outer wall by support 69, shower 68 is connected with feed tube 72, feed tube 72 is connected with desulfur pump 65, desulfur pump 65 connects regulating reservoir 90.
The course of work of the present utility model: 180m
2sintering machine 1, exhaust gas volumn 300000Nm
3/ h, SO
2concentration 1500mg/Nm
3, NOx concentration 700mg/Nm
3, dust concentration 130g/Nm
3, flue-gas temperature 100 ~ 180 DEG C;
Sintering machine 1 flue gas enters in bellows 2 by the suction function of blower fan 39, at each bellows 2 of connection on sintering device flue gas main pipeline 63, be provided with electric flow control valve 62, for mating each bellows 2 air quantity, then sintering device flue gas main pipeline 63 is entered, urea liquid after atomization is sent into urea liquid entrance 59 and is evenly entered in sintering device flue gas main pipeline 63, in sintering device flue gas main pipeline 63, nitrogen oxide generation chemical reaction in urea and flue gas, in sintering device flue gas main pipeline 63, NOx is reduced to N
2and water, sintering machine 1 flue gas through denitration process enters reaction tower 11 by the effect of blower fan 39, is accelerated after flue gas enters reaction tower 11 at trunnion 6 place, and high velocity air forms strong turbulent flow in reaction tower 11, produces efficient sufficient gas-solid contact, through desulfurization process containing high concentrate dust flue gas from reaction tower 11 top exhanst gas outlet 12 out after, udst separation is carried out in the sack cleaner 18 entering rear portion, prevent dust from entering desulfurizing tower 65 and produce blocking, sintering machine 1 flue gas through sack cleaner 18 enters desulfurizing tower 65 by the effect of blower fan 39, flue gas from bottom to top, when the nozzle 71 by being laid in the middle part of desulfurizing tower 65, due to gas-liquid counter current, the doctor solution that nozzle 71 is sprayed is fluidized state, gas-liquid is fully contacted, flue gas is after nozzle 71 sprays, water smoke is removed by high efficiency demister, in demister exiting flue gas, the concentration of droplet is less than 75mg/m
3, prevent water droplet corrode chimney 40, then through dehumidifying purifying column 74 in damp proof air cleaner 73, collect the fine solid particle in gas, purify air, remove water droplet further, through flowing out dehumidifying purifying column 74 except the flue gas of wet purification, finally entering chimney 40 and being discharged in air,
The urea granules conveying device be made up of urea granules feed bin 41, discharger 42, electron helical scale 43, frequency conversion rotary feeder 44 etc.; The exhaust gas volumn of flue gas Online Monitoring Control device 60 pairs of sintering machines 1 and the amount of generation NOx detect, and feed back to PLC control system, PLC control system calculates the consumption of urea, after electron helical scale 43 Weighing, by frequency conversion rotary feeder 44, according to operating mode, adjust conveying capacity by the mode changing rotating speed, after urea granules exports from frequency conversion rotary feeder 44, through jet mixer 49 mixing in dissolving case 50; During operation, the current of the nozzle ejection on jet mixer 49 top define the moisture film of one deck rotation, and urea granules is fallen moisture film from upper end, and along with moisture film rotation whereabouts, urea granules is wetted in the process;
Three liquid level gauges are had in dissolving case 50, be respectively high liquid level gauge 51, low liquid level gauge 52 and extremely low liquid level gauge 53, normal operating conditions is between high and low liquid level, automatically entering water electromagnetic valve 46 is opened to system during low liquid level, open frequency conversion rotary feeder 44 and mixer 48 simultaneously, the running time of frequency conversion rotary feeder 44, entering water electromagnetic valve 46 is controlled according to preparation concentration automatically by PLC program, and this method of operation can well ensure the concentration of preparating liquid;
Preparation concentration requires to set according to user by the touch screen controller on PLC control cabinet 61 panel, thus molten medicine process is carried out online, and ensure that the precision of solution concentration;
When there are abnormal conditions, system is by automatically out of service and send alarm signal.When extremely low liquid level action, system is by automatic alarm, and this design is to protect urea liquid delivery pump 56 when cutting off the water supply, and prevents urea liquid delivery pump 56 dry tap;
The flow of inlet water instrument 47 configured in water inlet system, the signal of real-time output flow of inlet water, PLC adjusts urea granules amount at any time according to the change of flow of inlet water, the concentration of urea liquid prepared by the system of guarantee is 35% ~ 40%, system is being cut off the water supply or the situation down coversion rotary feeder 44 of low discharge will be automatically out of service in addition, avoid wasting urea granules, reduce operating cost and be convenient to automatic management;
Be mixed with concentration be 35% ~ 40% urea liquid enter urea liquid conveyance conduit 57 by urea liquid delivery pump 56, atomized water is sprayed into by atomizer 58 in urea liquid conveyance conduit 57, the concentration dilution of urea liquid is made to be 3% ~ 5%, urea liquid after atomization is sent into urea liquid entrance 59 and is evenly entered in sintering device flue gas main pipeline 63, in sintering device flue gas main pipeline 63, the nitrogen oxide generation chemical reaction in urea and flue gas:
2CO(NH
2)
2+4NO+O
2＝4N
2+4H
2O+2CO
2
4CO(NH
2)
2+4NO
2＝6N
2+8H
2O+2CO
2
In sintering device flue gas main pipeline 63, NOx is reduced to N
2and water;
The flue gas of sintering machine 1, after denitration process, enters reaction tower 11 by the suction function of blower fan 39, is accelerated after flue gas enters reaction tower 11 at trunnion 6 place, and high velocity air forms strong turbulent flow in reaction tower 11, produces efficient sufficient gas-solid contact; Through reaction tower 11 through desulfurization process containing high concentrate dust flue gas from reaction tower 11 top exhanst gas outlet 12 out after, udst separation is carried out in the sack cleaner 18 entering rear portion, flue gas through purification flows out sack cleaner 18, enters the outer row of chimney 40 by blower fan 39 and clean flue; When the flue-gas temperature entering sack cleaner 18 exceedes the operating temperature of cloth bag, open by-passing valve 28, close electronic air inlet valve 38, make flue gas enter blower fan 39 by by-pass line, discharged by chimney 40, protection cloth bag;
The calcium hydroxide injection apparatus be made up of calcium hydroxide dry powder feed bin 21, discharger 22, electron helical scale 23, frequency conversion rotary feeder 24, high pressure roots blower fan 25, mixture generator 26, calcium hydroxide playpipe 27 etc., according to the exhaust gas volumn of sintering machine 1 and the amount of generation sulfide, calculate Ca (OH)
2consumption, after electron helical scale 23 Weighing, by frequency conversion rotary feeder 24, according to operating mode, powder delivering amount is adjusted by the mode changing rotating speed, powder delivering amount sends into mixture generator 26, from the wind-force of high pressure roots blower fan 25, the powder falling into mixture generator 26 is sent into the calcium hydroxide mouth 7 that dusts by calcium hydroxide playpipe 27 to be entered in reaction tower 11, in reaction tower 11, spread in calcium hydroxide particle in flue gas under mutual rubbing action, constantly (Asia) sulphur sulphur calcium 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 high, due to SO
3, the sulphur gas such as HF, HCL compares SO
2easier and calcium hydroxide reacts, SO in reaction tower 11
3, HF, HCL removal efficiency can reach more than 98%, in reaction tower 11, reacted calcium hydroxide is by air flume 19, reaction tower circulating line 14 and reaction tower 11 carry out calcium hydroxide iterative cycles, its internal circulating load is controlled by recycle feed valve 13, middle pressure roots blower 20 is provided with bottom air flume 19, calcium hydroxide in air flume 19 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 15, by desulfurization product, dust in flue gas enters ash silo 16, the circulatory system is discharged by electric cinder valve 17, 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+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 11, 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 11; 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 sulfur-containing smoke gas 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 reacts with sulfur-containing smoke gas.Ca (OH)
2iterative cycles and smoke contacts, Ca (OH)
2utilization rate is high, improves desulfuration efficiency;
The injection apparatus of active carbon is made up of active carbon feed bin 29, discharger 30, electron helical scale 31, frequency conversion rotary feeder 32, high pressure roots blower fan 33, mixture generator 34, active carbon playpipe 35 etc., according to exhaust gas volumn and the generation dioxin of sintering machine 1, the amount of the harmful substances such as heavy metal, the consumption of calculated activity charcoal, after electron helical scale 31 Weighing, by frequency conversion rotary feeder 32, according to operating mode, active carbon conveying capacity is adjusted by the mode changing rotating speed, active carbon sends into mixture generator 34, from the wind-force of high pressure roots blower fan 33, the active carbon falling into mixture generator 34 is sent into active carbon entrance 36 by active carbon playpipe 35 to be entered in sack cleaner pipeline 37, the active carbon sprayed into adsorbs harmful substances such as the dioxin in flue gas and heavy metals,
Water for industrial use in water tank 10 pumps in the water jet 8 of reaction tower 11 by water pump 9, and water, with vaporific ejection, improves Ca (OH)
2with SO
2, SO
3, the heat transfer of the sour gas such as HF, HCL, mass transfer rate, there is neutralization reaction, remove the sour gas in flue gas, improve desulfuration efficiency;
Secondary desulfuration reacts:
Adopt NaOH as desulfurization absorbent, desulfurizing agent is squeezed into desulfurizing tower 65 through desulfur pump 83 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 65 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 84, supernatant after precipitation Ash Water Separator, send into regulating reservoir 90, in regulating reservoir 90, when pH value is reduced to a certain degree, after measuring the pH value in regulating reservoir 90 by regulating reservoir pH detection control instrument 89, controlling electric charging valve 88 adds in regulating reservoir 90 by constantly supplementary for the NaOH in NaOH storage tank 87, in desulfurizing tower 65, when pH value is reduced to a certain degree, after measuring the pH value in desulfurizing tower 65 by pH detection control instrument 82, in desulfurizing tower 65, desulfurizing agent is added by controlling desulfur pump 83, circulation like this, heavy ash in sedimentation basin 84 is regularly removed, pick up outward transport,
The conveying device of calcium hydroxide is made up of calcium hydroxide feed bin 75, discharger 76, electron helical scale 77, frequency conversion rotary feeder 78, in aeration displacement reaction pond 79, when pH value is reduced to a certain degree, after measuring the pH value in aeration displacement reaction pond 79 by aeration displacement reaction pond pH detection control instrument 80, after electron helical scale 77 Weighing, by frequency conversion rotary feeder 78, according to the pH value in aeration displacement reaction pond 79, adjust the conveying capacity of calcium hydroxide by the mode changing rotating speed, calcium hydroxide is sent in aeration displacement reaction pond 79;
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 79, 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 81, in aeration displacement reaction pond 79, 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, 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.
As can be seen here, the utility model provides a kind of flue gas of sintering machine denitration device, and the aqueous solution of urea of preparation sprays in flue as medicament by this equipment, and the nitrogen oxide of medicament preferentially and in flue gas carries out chemical reduction reaction, and in flue, NOx is reduced to N
2and water, thus reach the object reducing discharged nitrous oxides concentration, its automaticity is high, can meet the continuous to-be to medicament when large exhaust gas volumn removes nitrogen oxide, use manpower and material resources sparingly; Flue gas Online Monitoring Control device detects the NOx content in flue gas, and feed back to PLC control system, frequency conversion rotary feeder, entering water electromagnetic valve is controlled after PLC control system calculates, regulate the dosage of urea, water, ensure the concentration of preparating liquid, the denitration effect guaranteed, avoids waste, reduces operating cost; 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 high; Have denitration, desulfuration efficiency is 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 60mg/Nm
3, the concentration of emission 50mg/Nm of NOx
3, dust emission concentration 10mg/Nm
3, the noxious pollutants such as the dioxin in flue gas, heavy metal can be adsorbed, make flue gas qualified discharge, avoid environment.
Claims (1)
1. a flue gas of sintering machine denitration device, comprise sintering machine, bellows, flue gas Online Monitoring Control device, reaction tower, sack cleaner, electronic air inlet valve, desulfurizing tower, dehumidifying purifying column, blower fan, chimney, it is characterized in that: described sintering machine is linked in sequence bellows, flue gas Online Monitoring Control device, reaction tower, sack cleaner, electronic air inlet valve, desulfurizing tower, dehumidifying purifying column, blower fan, chimney, electric flow control valve is connected with between described bellows and flue gas Online Monitoring Control device, described flue gas Online Monitoring Control device connects PLC control cabinet, PLC control cabinet connects frequency conversion rotary feeder, electron helical scale is connected above frequency conversion rotary feeder, electron helical scale connects discharger, discharger connects urea granules feed bin, be connected with jet mixer top below frequency conversion rotary feeder, jet mixer side is by inlet channel and entering water electromagnetic valve, water inlet connects, jet mixer bottom connects dissolves case, dissolve side, box top and be provided with flow of inlet water instrument, flow of inlet water instrument is by inlet channel and entering water electromagnetic valve, water inlet connects, dissolve case inside and be provided with mixer, the motor of mixer is arranged on and dissolves box top, dissolve case inside and be provided with high liquid level gauge, low liquid level gauge and extremely low liquid level gauge, PLC control cabinet by control cables respectively with entering water electromagnetic valve, flow of inlet water instrument, high liquid level gauge, low liquid level gauge, extremely low liquid level gauge, water pump, urea liquid delivery pump connects, dissolve case and connect urea liquid delivery pump by urea liquid conveyance conduit, urea liquid delivery pump connects urea liquid entrance by urea liquid conveyance conduit, atomizer is provided with in the urea liquid conveyance conduit of urea liquid delivery pump and urea liquid entrance, atomizer connects water pump by pipeline, water pump connects water tank by pipeline, urea liquid entrance is positioned on the sidewall of sintering device flue gas main pipeline, described flue gas Online Monitoring Control device 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 connects water pump by pipeline, water pump connects water tank, water jet top is connected with exhanst gas outlet, exhanst gas outlet passes through to connect sack cleaner into sack cleaner pipeline, enter on sack cleaner pipeline and be provided with active carbon entrance, active carbon entrance connects mixture generator by active carbon playpipe, 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 scale, electron helical scale connects discharger, discharger connects active carbon feed bin, sack cleaner bottom connects air flume, roots blower is pressed in connecting 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 scale, electron helical scale connects discharger, discharger connects calcium hydroxide dry powder feed bin, connecting bypass pipeline between described sack cleaner and electronic air inlet valve import, by-pass line is connected with fan inlet, by-pass line is provided with by-passing valve, described electronic air inlet valve outlet 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 scale, electron helical scale connects 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.
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|---|---|---|---|
| CN201520628738.2U CN204816205U (en) | 2015-08-11 | 2015-08-11 | Sintering machine flue gas desulfurization denitration equipment |
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|---|---|---|---|
| CN201520628738.2U CN204816205U (en) | 2015-08-11 | 2015-08-11 | Sintering machine flue gas desulfurization denitration equipment |
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|---|---|
| CN204816205U true CN204816205U (en) | 2015-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109395566A (en) * | 2018-12-14 | 2019-03-01 | 宝鸡市泰得电子信息有限公司 | A kind of Industrial Boiler flue gas desulfurization and denitrification energy-saving environmental protection device |
-
2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109395566A (en) * | 2018-12-14 | 2019-03-01 | 宝鸡市泰得电子信息有限公司 | A kind of Industrial Boiler flue gas desulfurization and denitrification energy-saving environmental protection device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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