CN204307516U - A kind of coal-burning boiler for flue gas desulfurization, denitration device - Google Patents

A kind of coal-burning boiler for flue gas desulfurization, denitration device Download PDF

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CN204307516U
CN204307516U CN201420837094.3U CN201420837094U CN204307516U CN 204307516 U CN204307516 U CN 204307516U CN 201420837094 U CN201420837094 U CN 201420837094U CN 204307516 U CN204307516 U CN 204307516U
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heat exchange
fin heat
exchange pipe
pipe
desulfurizing tower
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吴浩仑
杨青
吴志强
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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 coal-burning boiler for flue gas desulfurization, denitration device, comprise coal-burning boiler, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, heat exchange of heat pipe, SCR reactor, ammonia gasifier, chimney, it is characterized in that: described coal-burning boiler is linked in sequence sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, heat exchange of heat pipe, SCR reactor, ammonia gasifier, chimney, connecting bypass pipeline between described main air blower outlet 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 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.It is high that the utility model has desulfuration efficiency, and denitration efficiency is high, and investment operating cost is low, and reliability is high, safeguards easily, the advantages such as system long service life.

Description

A kind of coal-burning boiler for flue gas desulfurization, denitration device
Technical field
The utility model relates to a kind of coal-burning boiler for flue gas desulfurization, denitration 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, fire coal boiler fume SO 2concentration of emission reach 1500 ~ 2000mg/Nm 3, the concentration of emission of NOx reaches 600 ~ 800g/Nm 3, severe contamination is caused to environment.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, thus provides a kind of coal-burning boiler for flue gas desulfurization, denitration device, and this device adopts spray wet desulfurizing process, non-blind area, and desulfuration efficiency is up to more than 98%; Adopt selective catalytic reduction (SCR), under catalyst action, reduction of nitrogen oxide is become nitrogen by amino in reducing agent at relatively low temperature; Have desulfuration efficiency high, denitration efficiency is high, and investment operating cost is low, and reliability is high, safeguards easily, the advantages such as system long service life, SO 2concentration of emission 40mg/Nm 3, the concentration of emission 80mg/Nm of NOx 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, NOx < 100mg/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 coal-burning boiler for flue gas desulfurization, denitration device, comprise coal-burning boiler, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, heat exchange of heat pipe, SCR reactor, ammonia gasifier, chimney, it is characterized in that: described coal-burning boiler is linked in sequence sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, heat exchange of heat pipe, SCR reactor, ammonia gasifier, chimney, connecting bypass pipeline between described main air blower outlet 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 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, described heat exchange of heat pipe connects steam drum, steam drum connects steam accumulator by pipeline, catalyst layer is provided with in the middle of described SCR reactor, SCR reactor top is connected with ammonia/air mixer, ammonia/air mixer one tunnel is connected with dilution ammonia blower fan, another road exports with ammonia dashpot and is connected, described ammonia gasifier, comprise fin heat exchange pipe, feed tube, escape pipe, tube connector, frame, fin heat exchange pipe is totally eight row, often row ten arranges symmetrical composition, conducting is connected by tube connector, along the flow direction of liquid medium, fin number from less to more, fin heat exchange pipe is fixed in frame, first fin heat exchange pipe lower end connects feed tube, first fin heat exchange pipe side sets gradually the second fin heat exchange pipe, 3rd fin heat exchange pipe, 4th fin heat exchange pipe, 5th fin heat exchange pipe, 6th fin heat exchange pipe, 7th fin heat exchange pipe, 8th fin heat exchange pipe, 9th fin heat exchange pipe, tenth fin heat exchange pipe, first fin heat exchange pipe is the heat exchanger tube of band 4 fins, second fin heat exchange pipe is the heat exchanger tube of band 8 fins, 3rd fin heat exchange pipe, 4th fin heat exchange pipe, 5th fin heat exchange pipe, 6th fin heat exchange pipe, 7th fin heat exchange pipe, 8th fin heat exchange pipe, 9th fin heat exchange pipe, tenth fin heat exchange pipe is the heat exchanger tube of band 12 fins, first fin heat exchange pipe upper end is connected with the second fin heat exchange pipe upper end by tube connector, second fin heat exchange pipe lower end is connected with the 3rd fin heat exchange pipe lower end by tube connector, 3rd fin heat exchange pipe upper end is connected with the 4th fin heat exchange pipe upper end by tube connector, 4th fin heat exchange pipe lower end is connected with the 5th fin heat exchange pipe lower end by tube connector, 5th fin heat exchange pipe upper end is connected with the 6th fin heat exchange pipe upper end by tube connector, 6th fin heat exchange pipe lower end is connected with the 7th fin heat exchange pipe lower end by tube connector, 7th fin heat exchange pipe upper end is connected with the 8th fin heat exchange pipe upper end by tube connector, 8th fin heat exchange pipe lower end is connected with the 9th fin heat exchange pipe lower end by tube connector, 9th fin heat exchange pipe upper end is connected with the tenth fin heat exchange pipe upper end by tube connector, tenth fin heat exchange pipe lower end connects escape pipe, escape pipe is connected with the import of ammonia dashpot.
The beneficial effects of the utility model are: this device adopts spray wet desulfurizing process, non-blind area, and desulphurization reaction is constantly carried out fully, and desulfuration efficiency is up to more than 98%; Adopt selective catalytic reduction (SCR), under catalyst action, reduction of nitrogen oxide is become nitrogen by amino in reducing agent at relatively low temperature; It is high that this device has desulfuration efficiency, and denitration efficiency is high, 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, SO 2concentration of emission 40mg/Nm 3, the concentration of emission 80mg/Nm of NOx 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, NOx < 100mg/Nm 3, dust emission concentration < 20mg/Nm 3), 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 cutaway view Amplified image in Fig. 1.
Fig. 3 is B-B cutaway view Amplified image in Fig. 1.
Fig. 4 is C magnified partial view in Fig. 1.
Fig. 5 is the main TV structure schematic diagram of part 8 ammonia gasifier in Fig. 1.
Fig. 6 is the plan structure schematic diagram of part 8 ammonia gasifier in Fig. 1.
Fig. 7 is the left TV structure schematic diagram of part 8 ammonia gasifier in Fig. 1.
Fig. 8 is D magnified partial view in Fig. 5.
Fig. 9 is E-E cutaway view Amplified image in Fig. 5.
Figure 10 is F-F cutaway view Amplified image in Fig. 5.
Figure 11 is G-G cutaway view Amplified image in Fig. 5.
Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, in Figure 11, 1. coal-burning boiler, 2. sack cleaner, 3. main air blower, 4. desulfurizing tower, 5. dehumidifying purifying column, 6. heat exchange of heat pipe, 7.SCR reactor, 8. ammonia gasifier, 9. chimney, 10. electronic air inlet valve, 11. by-passing valves, 12. by-pass lines, 13. calcium hydroxide feed bins, 14. dischargers, 15. electron helicals claim, 16. frequency conversion rotary feeders, 17. aeration displacement reaction ponds, 18. aeration displacement reaction pond pH detection control instrument, 19. roots blowers, 20.pH detection control instrument, 21. desulfurizing tower air intakes, 22. demisters, 23. exhanst gas outlets, 24. showers, 25. supports, 26. hose adapters, 27. nozzles, 28. feed tubes, 29. desulfur pumps, 30. sedimentation basins, the outer discharge pipe of 31. waste liquids, 32. damp proof air cleaners, the outer discharge pipe of 33. dehumidifying purifying column waste liquid, 34. NaOH storage tanks, 35. electric charging valves, 36. regulating reservoir pH detection control instrument, 37. regulating reservoirs, 38. steam drums, 39. steam accumulators, 40. catalyst layers, 41. dilution ammonia blower fans, 42. ammonias/air mixer, 43. ammonia dashpots, 81. first fin heat exchange pipes, 82. second fin heat exchange pipes, 83. the 3rd fin heat exchange pipes, 84. the 4th fin heat exchange pipes, 85. the 5th fin heat exchange pipes, 86. the 6th fin heat exchange pipes, 87. the 7th fin heat exchange pipes, 88. the 8th fin heat exchange pipes, 89. the 9th fin heat exchange pipes, 810. the tenth fin heat exchange pipes, 811. feed tube, 812. escape pipe, 813. frame.
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, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, shown in Figure 11, the utility model is a kind of coal-burning boiler for flue gas desulfurization, denitration device, comprise coal-burning boiler 1, sack cleaner 2, main air blower 3, desulfurizing tower 4, dehumidifying purifying column 5, heat exchange of heat pipe 6, SCR reactor 7, ammonia gasifier 8, chimney 9, it is characterized in that: described coal-burning boiler 1 is linked in sequence sack cleaner 2, main air blower 3, desulfurizing tower 4, dehumidifying purifying column 5, heat exchange of heat pipe 6, SCR reactor 7, ammonia gasifier 8, chimney 9, described main air blower 3 exports connecting bypass pipeline 12 between electronic air inlet valve 10 import, by-pass line 12 is connected with chimney 9 import, by-pass line 12 is provided with by-passing valve 11, described electronic air inlet valve 10 outlet is connected with desulfurizing tower air intake 21, desulfurizing tower air intake 21 lower sides is provided with pH detection control instrument 20, pH detection control instrument 20 is connected with desulfur pump 29 by control cables, desulfurizing tower air intake 21 bottom connects aeration displacement reaction pond 17 by pipeline, aeration displacement reaction pond 17 connects sedimentation basin 30, side, aeration displacement reaction pond 17 is provided with roots blower 19, opposite side is provided with calcium hydroxide feed bin 13, calcium hydroxide feed bin 13 connects discharger 14, discharger 14 connects electron helical and claims 15, electron helical claims 15 connection frequency conversion rotary feeders 16, frequency conversion rotary feeder 16 connects aeration displacement reaction pond 17, aeration displacement reaction pond 17 pool side is provided with aeration displacement reaction pond pH detection control instrument 18, aeration displacement reaction pond pH detection control instrument 18 is connected with frequency conversion rotary feeder 16 by control cables, sedimentation basin 30 connects regulating reservoir 37, sedimentation basin 30 bottom is provided with the outer discharge pipe 31 of waste liquid, regulating reservoir 37 opposite side is provided with NaOH storage tank 34, regulating reservoir 37 pool side is provided with regulating reservoir pH detection control instrument 36, regulating reservoir pH detection control instrument 36 is connected with electric charging valve 35 by control cables, desulfurizing tower air intake 21 top is provided with nozzle 27, nozzle 27 top is provided with demister 22, demister 22 top is provided with exhanst gas outlet 23, exhanst gas outlet 23 connects dehumidifying purifying column 5, damp proof air cleaner 32 is provided with in dehumidifying purifying column 5, the outer discharge pipe 33 of dehumidifying purifying column waste liquid is provided with bottom dehumidifying purifying column 5, nozzle 27 is connected with the hose adapter 26 of desulfurizing tower 4 outer wall through desulfurizing tower 4 inwall, hose adapter 26 is connected with shower 24, shower 24 is fixed on desulfurizing tower 4 outer wall by support 25, shower 24 is connected with feed tube 28, feed tube 28 is connected with desulfur pump 29, desulfur pump 29 connects regulating reservoir 37, described heat exchange of heat pipe 6 connects steam drum 38, steam drum 38 connects steam accumulator 39 by pipeline, catalyst layer 40 is provided with in the middle of described SCR reactor 7, SCR reactor 7 top is connected with ammonia/air mixer 42, ammonia/air mixer 42 1 tunnel is connected with dilution ammonia blower fan 41, another road exports with ammonia dashpot 43 and is connected, described ammonia gasifier S, comprise fin heat exchange pipe, feed tube 811, escape pipe 812, tube connector, frame 813, it is characterized in that: fin heat exchange pipe is totally eight row, often row ten arranges symmetrical composition, conducting is connected by tube connector, along the flow direction of liquid medium, fin number from less to more, fin heat exchange pipe is fixed in frame 813, first fin heat exchange pipe 81 lower end connects feed tube 811, first fin heat exchange pipe 81 side sets gradually the second fin heat exchange pipe 82, 3rd fin heat exchange pipe 83, 4th fin heat exchange pipe 84, 5th fin heat exchange pipe 85, 6th fin heat exchange pipe 86, 7th fin heat exchange pipe 87, 8th fin heat exchange pipe 88, 9th fin heat exchange pipe 89, tenth fin heat exchange pipe 810, first fin heat exchange pipe 81 is the heat exchanger tube of band 4 fins, second fin heat exchange pipe 82 is the heat exchanger tube of band 8 fins, 3rd fin heat exchange pipe 83, 4th fin heat exchange pipe 84, 5th fin heat exchange pipe 85, 6th fin heat exchange pipe 86, 7th fin heat exchange pipe 87, 8th fin heat exchange pipe 88, 9th fin heat exchange pipe 89, tenth fin heat exchange pipe 810 is the heat exchanger tube of band 12 fins, first fin heat exchange pipe 81 upper end is connected with the second fin heat exchange pipe 82 upper end by tube connector, second fin heat exchange pipe 82 lower end is connected with the 3rd fin heat exchange pipe 83 lower end by tube connector, 3rd fin heat exchange pipe 83 upper end is connected with the 4th fin heat exchange pipe 84 upper end by tube connector, 4th fin heat exchange pipe 84 lower end is connected with the 5th fin heat exchange pipe 85 lower end by tube connector, 5th fin heat exchange pipe 85 upper end is connected with the 6th fin heat exchange pipe 86 upper end by tube connector, 6th fin heat exchange pipe 86 lower end is connected with the 7th fin heat exchange pipe 87 lower end by tube connector, 7th fin heat exchange pipe 87 upper end is connected with the 8th fin heat exchange pipe 88 upper end by tube connector, 8th fin heat exchange pipe 88 lower end is connected with the 9th fin heat exchange pipe 89 lower end by tube connector, 9th fin heat exchange pipe 89 upper end is connected with the tenth fin heat exchange pipe 810 upper end by tube connector, tenth fin heat exchange pipe 810 lower end connects escape pipe 812, escape pipe 812 is connected with ammonia dashpot 43 import.
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 2000mg/Nm 3, the concentration 800mg/Nm of NOx 3, dust concentration 30g/Nm 3, oxygen content is 5% ~ 8%, coal-burning boiler 1 flue gas enters sack cleaner 2 by the suction function of main air blower 3, coal-burning boiler 1 ash-laden gas is played to the effect of dedusting, efficiency of dust collection reaches 99, 9%, prevent dust from entering desulfurizing tower 4 and produce blocking, coal-burning boiler 1 flue gas through sack cleaner 2 enters desulfurizing tower 4, flue gas from bottom to top, when the nozzle 27 by being laid in the middle part of desulfurizing tower 4, due to gas-liquid counter current, the doctor solution that nozzle 27 is sprayed is fluidized state, gas-liquid is fully contacted, flue gas is after nozzle 27 sprays, water smoke is removed by high efficiency demister 22, in demister 22 exiting flue gas, the concentration of droplet is less than 75mg/m 3, prevent water droplet from corroding chimney 9, then in dehumidifying purifying column 5 damp proof air cleaner 32, collect the fine solid particle in gas, purify air, remove water droplet further, be finally discharged in air by chimney 9,
Adopt NaOH as desulfurization absorbent, desulfurizing agent is squeezed into desulfurizing tower 4 through desulfur pump 29 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 4 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 30, supernatant after precipitation Ash Water Separator, send into regulating reservoir 37, in regulating reservoir 37, when pH value is reduced to a certain degree, after measuring the pH value in regulating reservoir 37 by regulating reservoir pH detection control instrument 36, controlling electric charging valve 35 adds in regulating reservoir 37 by constantly supplementary for the NaOH in NaOH storage tank 34, in desulfurizing tower 4, when pH value is reduced to a certain degree, after measuring the pH value in desulfurizing tower 4 by pH detection control instrument 20, in desulfurizing tower 4, desulfurizing agent is added by controlling desulfur pump 29, circulation like this, heavy ash in sedimentation basin 30 is regularly removed, pick up outward transport,
By the conveying device that calcium hydroxide feed bin 13, discharger 14, electron helical claim 15, frequency conversion rotary feeder 16 forms calcium hydroxide, in aeration displacement reaction pond 17, when pH value is reduced to a certain degree, after measuring the pH value in aeration displacement reaction pond 17 by aeration displacement reaction pond pH detection control instrument 18, claim after 15 Weighings through electron helical, by frequency conversion rotary feeder 16, according to the pH value in aeration displacement reaction pond 17, adjust the conveying capacity of calcium hydroxide by the mode changing rotating speed, calcium hydroxide is sent in aeration displacement reaction pond 17;
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 17, 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 19, in aeration displacement reaction pond 17, 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 4 can not normally run, open by-passing valve 11, close electronic air inlet valve 10, make the flue gas through bag-type dust, enter chimney 9 by by-pass line 12 again through main air blower 3 and discharge;
From desulfurizing tower 4 flue gas out, temperature, at 70 ~ 80 DEG C, enters heat exchange of heat pipe 6, and smoke absorption is from the heat of steam accumulator 39, and flue-gas temperature is elevated to 180 ~ 190 DEG C, meets the requirement of denitrating technique to flue-gas temperature;
Denitrification process: liquefied ammonia is transported to liquid ammonia storage tank by tank car, the liquefied ammonia of output becomes ammonia after ammonia gasifier 8, is delivered to ammonia dashpot 43 for subsequent use; Ammonia in ammonia dashpot 43 is sent in ammonia/air mixer 42 after decompression, after mixing from the air diluting ammonia blower fan 41, sprayed in flue gas by the nozzle of spray ammonia barrier and also fully mix with it, then SCR reactor 7 is entered, when flue gas flows through the catalyst layer 40 of SCR reactor 7, catalytic reaction occurs, and NOx is optionally reduced:
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.
As can be seen here, the utility model adopts spray wet desulfurizing process, non-blind area, and desulphurization reaction is constantly carried out fully, and desulfuration efficiency is up to more than 98%; Adopt selective catalytic reduction (SCR), under catalyst action, reduction of nitrogen oxide is become nitrogen by amino in reducing agent at relatively low temperature; It is high that this device has desulfuration efficiency, and denitration efficiency is high, 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, SO 2concentration of emission 40mg/Nm 3, the concentration of emission 80mg/Nm of NOx 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, NOx < 100mg/Nm 3, dust emission concentration < 20mg/Nm 3), make flue gas qualified discharge, avoid environment.

Claims (1)

1. a coal-burning boiler for flue gas desulfurization, denitration device, comprise coal-burning boiler, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, heat exchange of heat pipe, SCR reactor, ammonia gasifier, chimney, it is characterized in that: described coal-burning boiler is linked in sequence sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, heat exchange of heat pipe, SCR reactor, ammonia gasifier, chimney, connecting bypass pipeline between described main air blower outlet 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 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, described heat exchange of heat pipe connects steam drum, steam drum connects steam accumulator by pipeline, catalyst layer is provided with in the middle of described SCR reactor, SCR reactor top is connected with ammonia/air mixer, ammonia/air mixer one tunnel is connected with dilution ammonia blower fan, another road exports with ammonia dashpot and is connected, described ammonia gasifier, comprise fin heat exchange pipe, feed tube, escape pipe, tube connector, frame, fin heat exchange pipe is totally eight row, often row ten arranges symmetrical composition, conducting is connected by tube connector, along the flow direction of liquid medium, fin number from less to more, fin heat exchange pipe is fixed in frame, first fin heat exchange pipe lower end connects feed tube, first fin heat exchange pipe side sets gradually the second fin heat exchange pipe, 3rd fin heat exchange pipe, 4th fin heat exchange pipe, 5th fin heat exchange pipe, 6th fin heat exchange pipe, 7th fin heat exchange pipe, 8th fin heat exchange pipe, 9th fin heat exchange pipe, tenth fin heat exchange pipe, first fin heat exchange pipe is the heat exchanger tube of band 4 fins, second fin heat exchange pipe is the heat exchanger tube of band 8 fins, 3rd fin heat exchange pipe, 4th fin heat exchange pipe, 5th fin heat exchange pipe, 6th fin heat exchange pipe, 7th fin heat exchange pipe, 8th fin heat exchange pipe, 9th fin heat exchange pipe, tenth fin heat exchange pipe is the heat exchanger tube of band 12 fins, first fin heat exchange pipe upper end is connected with the second fin heat exchange pipe upper end by tube connector, second fin heat exchange pipe lower end is connected with the 3rd fin heat exchange pipe lower end by tube connector, 3rd fin heat exchange pipe upper end is connected with the 4th fin heat exchange pipe upper end by tube connector, 4th fin heat exchange pipe lower end is connected with the 5th fin heat exchange pipe lower end by tube connector, 5th fin heat exchange pipe upper end is connected with the 6th fin heat exchange pipe upper end by tube connector, 6th fin heat exchange pipe lower end is connected with the 7th fin heat exchange pipe lower end by tube connector, 7th fin heat exchange pipe upper end is connected with the 8th fin heat exchange pipe upper end by tube connector, 8th fin heat exchange pipe lower end is connected with the 9th fin heat exchange pipe lower end by tube connector, 9th fin heat exchange pipe upper end is connected with the tenth fin heat exchange pipe upper end by tube connector, tenth fin heat exchange pipe lower end connects escape pipe, escape pipe is connected with the import of ammonia dashpot.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104971605A (en) * 2015-06-24 2015-10-14 方耀 Coal-fired flue gas treatment method
CN106540499A (en) * 2015-09-17 2017-03-29 哈尔滨市金京锅炉有限公司 A kind of boiler smoke multiple stage filtration system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104971605A (en) * 2015-06-24 2015-10-14 方耀 Coal-fired flue gas treatment method
CN106540499A (en) * 2015-09-17 2017-03-29 哈尔滨市金京锅炉有限公司 A kind of boiler smoke multiple stage filtration system

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