CN105889960A - Flue gas desulfurization device for coal-fired boiler - Google Patents
Flue gas desulfurization device for coal-fired boiler Download PDFInfo
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- CN105889960A CN105889960A CN201410826166.9A CN201410826166A CN105889960A CN 105889960 A CN105889960 A CN 105889960A CN 201410826166 A CN201410826166 A CN 201410826166A CN 105889960 A CN105889960 A CN 105889960A
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Abstract
The invention discloses a flue gas desulfurization device for a coal-fired boiler. The flue gas desulfurization device comprises the coal-fired boiler, an electric air inlet valve, a reaction tower, a bag type dust remover, a main draught fan, a desulfurizer, a dehumidifying and purifying tower and a chimney. The flue gas desulfurization device is characterized in that the coal-fired boiler is sequentially connected with the electric air inlet valve, the reaction tower, the bag type dust remover, the main draught fan, the desulfurizer, the dehumidifying and purifying tower and the chimney; a bypass pipeline is connected between the coal-fired boiler and an inlet of the electric air inlet valve and is connected with an inlet of the chimney; a bypass valve is arranged on the bypass pipeline; an outlet of the electric air inlet valve is connected with an air inlet of the reaction tower; a conical dust collecting groove is connected with the lower portion of the air inlet of the reaction tower and is connected with an electric dust discharging valve; the upper portion of the air inlet of the reaction tower is connected with a throat tube; the upper portion of the throat tube is sequentially connected with a calcium hydroxide powder spraying opening and a water spraying opening; and the upper portion of the water spraying opening is connected with a flue gas outlet. The flue gas desulfurization device has the beneficial effects that the desulfurization efficiency is high, the investment operating cost is low, reliability is high, energy consumption is low, maintenance is easy, occupied area is small, and the service life of a system is long.
Description
Technical field
The present invention relates to a kind of flue-gas desulfurizing device, be particularly used for purification coal-burning boiler and produce
Raw flue gas, belongs to environmental technology field.
Background technology
At present, containing sulfur in the coal dust used by coal-burning boiler, through 1200 DEG C～1500 DEG C of high-temperature firing processes
In, the sulfur in raw material generates SO through chemical reaction2Enter flue gas, the SO of discharged from coal-fired boiler2Account for domestic SO2
A big chunk of total emission volumn, according to the analysis to fire coal boiler fume, has a following features:
(1) in fire coal boiler fume, SO2 concentration change is very fast and fluctuation of concentration amplitude is big；
(2) flue-gas temperature of discharged from coal-fired boiler generally fluctuates between 120 DEG C～160 DEG C；
(3) dust concentration in fire coal boiler fume is substantially at 15g/Nm3To 30g/Nm3Between 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 relatively big, generally fluctuates between 8%～10.5%.
In sum, the flue-gas temperature of coal-burning boiler mostly between 120～160 DEG C, residing flue gas environment
Condition is relatively severe, oxygen content as higher in dust concentration, flue gas is higher, water capacity compared with big, heavy metal is dense
Spend more high, in the case of using sulphur coal, fire coal boiler fume SO2Concentration of emission reach 5000～
6000mg/Nm3, only with primary cycle dry desulfurization, desulfurization degree can only achieve 90%, it is impossible to reaches SO2Row
Put concentration ＜ 50mg/Nm3Discharge standard.
Summary of the invention
The present invention is directed to the problems referred to above, it is provided that a kind of flue-gas desulfurizing device, one-level uses circulation dry method
Desulfurization, doctor solution consumption is few and utilization rate high, and desulfurization degree is up to 90%；Two grades use spray wet desulphurization work
Skill, non-blind area, desulfuration efficiency is up to more than 95%；Having desulfuration efficiency high, investment operating cost is low, reliably
Property high, energy consumption is low, safeguards easily, the advantages such as floor space is little, system length in service life, SO2Concentration of emission
30mg/Nm3, dust emission concentration 15mg/Nm3, " thermal power plant's air is dirty to be better than GB13223-2011 standard
Dye thing discharge standard " (SO2＜ 50mg/Nm3, dust emission concentration ＜ 20mg/Nm3), make flue gas qualified discharge,
Avoid environment.
The technical scheme is that a kind of flue-gas desulfurizing device, including coal-burning boiler, electronic
Air inlet valve, reaction tower, sack cleaner, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, its feature
It is: described coal-burning boiler is linked in sequence electronic air inlet valve, reaction tower, sack cleaner, main air blower, de-
Sulfur 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, and by-pass line is provided with bypass valve, the outlet of described electronic air inlet valve with
Reaction tower air intake connects, and reaction tower air intake bottom connects taper ash collection slot, and taper ash collection slot connects electricity
Dynamic unloading valve, reaction tower air intake top connects has trunnion, the trunnion top calcium hydroxide that has been linked in sequence to dust
Mouth, water jet, water jet top connects exhanst gas outlet, and exhanst gas outlet connects sack cleaner, and cloth bag removes
Dirt device bottom connects air flume, and connecting bottom air flume has middle pressure roots blower, air flume side
Coupled reaction tower circulating line, reaction tower circulating line one tunnel connects recycle feed valve, and another road connects ash silo
Electrodynamic valve, ash silo electrodynamic valve connects ash silo, and ash silo bottom connects electric cinder valve, and reaction tower calcium hydroxide sprays
Powder mouth connects mixture generator by calcium hydroxide playpipe, and mixture generator one tunnel connects high pressure roots blower fan,
Mixture generator is connected above frequency conversion rotary feeder, and frequency conversion rotary feeder connects electron helical and claims, electronics
Spiral claims to connect discharger, and discharger connects calcium hydroxide dry powder feed bin, and reaction tower water jet is by pipeline even
Water pump, water pump connects water tank, and described main air blower import one tunnel is connected with sack cleaner, separately leads up to
Sack cleaner by-pass line is connected with by-pass line, and sack cleaner by-pass line is provided with bag-type dust
Device bypass valve, the outlet of described main air blower leads up to desulfurizing tower by-pass line and is connected with by-pass line, desulfurizing tower
Being provided with desulfurizing tower bypass valve on by-pass line, another road is connected with desulfurizing tower electronic air inlet valve, desulfurizing tower electricity
Dynamic air inlet valve is connected with desulfurizing tower air intake, and desulfurizing tower air intake lower sides is provided with PH and detects controller,
PH detection controller is connected with desulfurization pump by controlling cable, and desulfurizing tower air intake bottom connects exposure by pipeline
Gas displacement reaction pond, aeration displacement reaction pond connects sedimentation tank, and side, aeration displacement reaction pond is provided with Roots
Blower fan, opposite side is provided with calcium hydroxide feed bin, and calcium hydroxide feed bin connects discharger, and discharger connects electricity
Sub-spiral claims, and electron helical claims to connect frequency conversion rotary feeder, and it is anti-that frequency conversion rotary feeder connects aeration displacement
Ying Chi, aeration displacement reaction pond pool side is provided with aeration displacement reaction pond PH and detects controller, and aeration displacement is anti-
Answering PH detection controller in pond to be connected with frequency conversion rotary feeder by controlling cable, sedimentation tank connects regulating reservoir,
Sedimentation tank bottom is provided with the outer discharge pipe of waste liquid, and regulating reservoir opposite side is provided with sodium hydroxide storage tank, regulating reservoir
Pool side is provided with regulating reservoir PH and detects controller, and regulating reservoir PH detection controller is by controlling cable with electronic
Charging valve connects, and desulfurizing tower air intake top is provided with nozzle, and nozzle top is provided with demister, demister
Top is provided with exhanst gas outlet, and exhanst gas outlet connects dehumidifying purifying column, is provided with damp proof sky in dehumidifying purifying column
Air filter, is provided with the outer discharge pipe of dehumidifying purifying column waste liquid bottom dehumidifying purifying column, nozzle passes desulfurizing tower
Inwall is connected with the hose adapter of desulfurizing tower outer wall, and hose adapter is connected with shower, and shower is fixed by support
On desulfurizing tower outer wall, shower is connected with feed tube, and feed tube is connected with desulfurization pump, and desulfurization pump connects to be adjusted
Joint pond.
The invention has the beneficial effects as follows: one-level of the present invention uses circulation dry desulfurization, and doctor solution consumption is few and sharp
High by rate, in cyclic process, sorbent particle is under mutual rubbing action, the most exposed surface that makes new advances, and makes to take off
Reaction of Salmon-Saxl is constantly sufficiently carried out, and desulfurization degree is up to 90%；Two grades of employing spray wet desulfurizing process, non-blind area,
Making desulphurization reaction constantly be sufficiently carried out, desulfuration efficiency is up to more than 95%；There is desulfuration efficiency high, investment fortune
Row expense is low, and reliability is high, and energy consumption is low, safeguards easily, the advantages such as floor space is little, system length in service life,
SO2Concentration of emission 30mg/Nm3, dust emission concentration 15mg/Nm3, it is better than GB13223-2011 standard
" fossil-fuel power plant atmospheric pollutant emission standard " (SO2＜ 50mg/Nm3, dust emission concentration ＜ 20mg/Nm3), make
Flue gas qualified discharge, it is to avoid to environment.
Compared with prior art, the invention have the advantages that, economic effect:
1) one-level uses circulation dry desulfurization, and doctor solution consumption is few and utilization rate high, desulfurization in cyclic process
Agent granule under mutual rubbing action, the most exposed surface that makes new advances, make desulphurization reaction constantly be sufficiently carried out,
Desulfurization degree is up to 90%.
2) two grades use spray wet desulfurizing process, non-blind area, make desulphurization reaction constantly be sufficiently carried out, de-
Sulphur efficiency is up to more than 95%.
3) NaOH consumes fewer, and after the circulation of Systemic absorption liquid, actually main consumption is calcium hydroxide,
Operating cost is low.
4) be provided with special efficient dehydration demister, be dehydrated, except fog effect good.
5) system is run and is used control circulation fluid pH value control method to guarantee system stable operation.
6) liquid-gas ratio is little, and investment, operating cost are low, and system anticorrosion, anti-wear performance are reliable, and service life is long.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is A-A profile in Fig. 1.
Fig. 3 is B-B profile in Fig. 1.
Fig. 4 is C portion enlarged drawing in Fig. 1.
In Fig. 1, Fig. 2, Fig. 3, 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. cigarette
Gas exports, 10. recycle feed valve, 11. reaction tower circulating lines, 12. ash silo electrodynamic valves, 13. ash silos, and 14.
Electric cinder valve, 15. sack cleaners, 16. air flumes, press roots blower, 18. calcium hydroxide in 17.
Playpipe, 19. calcium hydroxide dry powder feed bins, 20. dischargers, 21. electron helicals claim, 22. frequency conversions rotate to
Material machine, 23. high pressure roots blower fans, 24. mixture generators, 25. main air blowers, 26. desulfurizing tower bypass valves, 27.
Desulfurizing tower electronic air inlet valve, 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 filters,
38. dehumidifying purifying columns, 39. chimneys, 40. calcium hydroxide feed bins, 41. dischargers, 42. electron helicals claim, and 43.
Frequency conversion rotary feeder, 44. aeration displacement reaction ponds, 45. aeration displacement reaction pond PH detection controllers, 46.
Roots blower, 47.PH detects controller, 48. desulfurization pumps, 49. sedimentation tanks, the outer discharge pipe of 50. waste liquids, and 51.
The outer discharge pipe of dehumidifying purifying column waste liquid, 52. sodium hydroxide storage tanks, 53. electric charging valves, 54. regulating reservoir PH
Detection controller, 55. regulating reservoirs, 56. water tanks, 57. water pumps, 58. water jets, 59. bypass valves, 60. is other
Thread a pipe, 61. bypass valve of bag dust collector, 62. sack cleaner by-pass lines, 63. desulfurizing tower by-pass lines.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the present invention is a kind of flue-gas desulfurizing device, bag
Include 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 characterised in that: described coal-burning boiler 1 is linked in sequence electronic air intake
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 with
Chimney 39 import connects, and by-pass line 60 is provided with bypass valve 59, the outlet of described electronic air inlet valve 2 with
Reaction tower air intake 3 connects, and reaction tower air intake 3 bottom connects taper ash collection slot 4, taper ash collection slot 4
Connecting electric cinder valve 5, reaction tower air intake 3 top connects has trunnion 6, trunnion 6 top to be linked in sequence
Calcium hydroxide dusts mouth 7, water jet 58, and water jet 58 top connects exhanst gas outlet 9, exhanst gas outlet 9
Connecting sack cleaner 15, sack cleaner 15 bottom connects has air flume 16, bottom air flume 16
Connecting and have middle pressure roots blower 17, air flume 16 side coupled reaction tower circulating line 11, reaction tower follows
Endless tube road 11 1 tunnel connects recycle feed valve 10, and another road connects ash silo electrodynamic valve 12, ash silo electrodynamic valve 12
Connecting ash silo 13, ash silo 13 bottom connects electric cinder valve 14, and the reaction tower calcium hydroxide mouth 7 that dusts passes through
Calcium hydroxide playpipe 18 connects mixture generator 24, and mixture generator 24 1 tunnel connects high pressure roots blower fan
23, mixture generator 24 is connected above frequency conversion rotary feeder 22, and frequency conversion rotary feeder 22 connects electronics
Spiral claims 21, and electron helical claims 21 connection dischargers 20, and discharger 20 connects calcium hydroxide dry powder feed bin 19,
Reaction tower water jet 58 connects water pump 57 by pipeline, and water pump 57 connects water tank 56, described main air blower 25
Import one tunnel is connected with sack cleaner 15, separately leads up to sack cleaner by-pass line 62 and bypass pipe
Road 60 connects, and sack cleaner by-pass line 62 is provided with bypass valve of bag dust collector 61, described main air
Machine 25 outlet is leaded up to desulfurizing tower by-pass line 63 and is connected with by-pass line 60, desulfurizing tower by-pass line 63
On be provided with desulfurizing tower bypass valve 26, another road is connected with desulfurizing tower electronic air inlet valve 27, desulfurizing tower electronic enter
Air-valve 27 is connected with desulfurizing tower air intake 28, and desulfurizing tower air intake 28 lower sides is provided with PH detection control
Instrument 47 processed, PH detection controller 47 is connected with desulfurization pump 48 by controlling cable, desulfurizing tower air intake 28
Bottom connects aeration displacement reaction pond 44 by pipeline, and aeration displacement reaction pond 44 connects sedimentation tank 49, exposes
Side, gas displacement reaction pond 44 is provided with roots blower 46, and opposite side is provided with calcium hydroxide feed bin 40, hydrogen
Calcium oxide feed bin 40 connects discharger 41, and discharger 41 connects electron helical and claims 42, and electron helical claims 42
Connecting frequency conversion rotary feeder 43, frequency conversion rotary feeder 43 connects aeration displacement reaction pond 44, and aeration is put
Change reaction tank 44 pool side and be provided with aeration displacement reaction pond PH detection controller 45, aeration displacement reaction pond PH
Detection controller 45 is connected with frequency conversion rotary feeder 43 by controlling cable, and sedimentation tank 49 connects regulating reservoir
55, sedimentation tank 49 bottom is provided with the outer discharge pipe 50 of waste liquid, and regulating reservoir 55 opposite side is provided with sodium hydroxide
Storage tank 52, regulating reservoir 55 pool side is provided with regulating reservoir PH and detects controller 54, and regulating reservoir PH detects control
Instrument 54 is connected with electric charging valve 53 by controlling cable, and desulfurizing tower air intake 28 top is provided with nozzle 35,
Nozzle 35 top is provided with demister 30, and demister 30 top is provided with exhanst gas outlet 31, exhanst gas outlet 31
Connecting dehumidifying purifying column 38, be provided with damp proof air filter 37 in dehumidifying purifying column 38, dehumidify purifying column
Being provided with the outer discharge pipe 51 of dehumidifying purifying column waste liquid bottom 38, nozzle 35 is through desulfurizing tower 29 inwall and desulfurization
The hose adapter 34 of tower 29 outer wall connects, and hose adapter 34 is connected with shower 32, and shower 32 passes through support
33 are fixed on desulfurizing tower 29 outer wall, and shower 32 is connected with feed tube 36, feed tube 36 and desulfurization pump
48 connect, and desulfurization pump 48 connects regulating reservoir 55.
The work process of the present invention: 170t/h coal-burning boiler 1, exhaust gas volumn 380000m3/ h, flue-gas temperature
120～160 DEG C, SO2Concentration 6000mg/Nm3, dust concentration 30g/Nm3, oxygen content 5%～8%,
Coal-burning boiler 1 flue gas enters reaction tower 8 by the suction function of main air blower 25, after flue gas enters reaction tower 8
Being accelerated at trunnion 6, high velocity air forms strong turbulent flow in reaction tower 8, produces the most fully
Gas-solid contact；Through desulfurization process the flue gas containing high concentrate dust from reaction tower 8 top exhanst gas outlet
9 out after, enter rear portion sack cleaner 15 in carry out udst separation, through purification flue gas flow out cloth
Bag dust collector 15, enters desulfurizing tower 29, more damp proof air filter 37 in dehumidifying purifying column 38, collects
Fine solid particle in gas, purifies air, removes water droplet further, be finally discharged in air by chimney 39；
Claimed 21 by calcium hydroxide dry powder feed bin 19, discharger 20, electron helical, frequency conversion rotary feeder 22,
The calcium hydroxide injection of the composition such as high pressure roots blower fan 23, mixture generator 24, calcium hydroxide playpipe 18
Device；Exhaust gas volumn according to coal-burning boiler 1 and the amount of generation sulfide, calculate Ca (OH)2Consumption, warp
After electron helical claims 21 Weighings, by frequency conversion rotary feeder 22, according to operating mode, with changing rotating speed
Mode adjusts powder delivering amount, and powder delivering amount sends into blender 24, from the wind-force of high pressure roots blower fan 23, will fall into
The powder of blender 24 is sent into the calcium hydroxide mouth 7 that dusts by calcium hydroxide playpipe 18 and is entered reaction tower 8
In, in reaction tower 8, spread in the calcium hydroxide particle in flue gas under mutual rubbing action, constantly handle
(sub-) calcium sulfate of calcium hydroxide particle Surface Creation is removed, and makes the calcium hydroxide within granule the most exposed
Make new advances surface, makes desulphurization reaction constantly be sufficiently carried out down, the SO in flue gas2Removal efficiency can reach
To 90%, due to SO3, the sour gas such as HF, HCL compare SO2It is more easy to react with calcium hydroxide,
SO in reaction tower 83, the removal efficiency of HF, HCL can reach more than 98%；In reaction tower 8 instead
Calcium hydroxide after should carries out calcium hydroxide by air flume 16, reaction tower circulating line 11 with reaction tower 8
Iterative cycles, its circulating load is controlled by recycle feed valve 10, is provided with middle pressure Roots bottom air flume 16
Blower fan 17, is in suspended state all the time by the calcium hydroxide in air flume 16, it is ensured that the removing occurred is anti-
Should, when, after desulfurization operation a period of time, opening ash silo electrodynamic valve 12, by the dust in desulfurization product, flue gas
Entering ash silo 13, discharge blood circulation by electric cinder valve 14, calcium hydroxide induction system is by calcium hydroxide
Iterative cycles and smoke contacts, circulating ratio reaches 100～200 times, and calcium hydroxide utilization rate is high；
A series of chemical change is there is in above-mentioned technical process:
Ca(OH)2+SO2+1/2H2O→CaSO3.1/2H2O+H2O
Ca(OH)2+SO3+H2O→CaSO4.2H2O
Ca(OH)2+2HCL→CaCL2.2H2O
Ca(OH)2+2HF→CaF2.2H2O
CaSO3.1/2H2O+1/2O2+2/3H2O→CaSO4.2H2O
Ca(OH)2+CO2→CaCO3+H2O
In reaction tower 8, mixture is dry relatively uniform, and recycle hydrogen calcium oxide has fabulous mobility, energy
Guarantee stablizing of operating mode in reaction tower 8；Sweetening process becomes the thicker granule work at gravity because of conglomeration
With falling in reaction tower taper ash collection slot 4, reacted tower bottom electric cinder valve 5 is discharged；
Secondary desulfuration reaction on cloth bag: under the effect of negative pressure, Ca (OH)2Powder adsorption is formed on cloth bag surface
One layer of Ca (OH)2Bisque, reacts further with the gas containing acid fume entering cleaner unit.In course of reaction, use
Cleaner unit import and export pressure differential controls deashing frequency, when pressure differential exceedes the upper limit of setting, to cloth bag
Carry out deashing, in order to Ca (OH)2Powder constantly adsorbs on cloth bag surface and containing acid fume solid/liquid/gas reactions.Ca(OH)2
Iterative 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 bypass valve 59,
Open bypass valve of bag dust collector 61, close electronic air inlet valve 2, make flue gas pass through by-pass line 60, enter
Sack cleaner by-pass line 62, enters main air blower 25, enters back into desulfurizing tower 29, then through dehumidifying purifying column
In 38, damp proof air filter 37, is finally discharged in air by chimney 39, protects cloth bag；
Sack cleaner 15, plays the effect of dedusting to coal-burning boiler 1 ash-laden gas, and efficiency of dust collection reaches 99%,
Prevent dust from entering desulfurizing tower 29 and produce blocking, through coal-burning boiler 1 flue gas of sack cleaner 15 by leading
The effect of blower fan 25 enters desulfurizing tower 29, and flue gas from bottom to top, by being laid in the middle part of desulfurizing tower 29
Nozzle 35 time, due to gas-liquid counter current, the doctor solution making nozzle 35 spray is fluidized state, makes gas-liquid fill
Tap is touched, and flue gas, after nozzle 35 sprays, removes water smoke by high efficiency demister 3O, and demister 30 exports
The concentration of flue fog drip is less than 75mg/m3, prevent water droplet from corroding chimney 39, then in dehumidifying purifying column 38
Damp proof air filter 37, collects the fine solid particle in gas, purifies air, removes water droplet further,
After be discharged in air by chimney 39；
Use NaOH as desulfurization absorbent, desulfurizing agent is squeezed into desulfurizing tower 29 through desulfurization pump 48 and fills with flue gas
Tap is touched, and makes the sulfur dioxide in flue gas carry out reaction with desulfurizing agent NaOH and generates Na2SO3, from desulfurizing tower 29
The Na discharged2SO3Solution, through aerating oxidation, generates Na2SO4, by adding calcium hydroxide to absorbing liquid
Regeneration and the precipitation of solid by-product, the mixed liquor through aeration and sodium, calcium displacement flows into sedimentation tank 49, warp
Supernatant after precipitation Ash Water Separator, sends into regulating reservoir 55, in regulating reservoir 55, when pH value is reduced to one
When determining degree, after measuring the pH value in regulating reservoir 55 by regulating reservoir PH detection controller 54, control electricity
Sodium hydroxide in sodium hydroxide storage tank 52 is continuously replenished in addition regulating reservoir 55 by dynamic charging valve 53, de-
In sulfur tower 29, when pH value is reduced to a certain degree, measure desulfurizing tower 29 by PH detection controller 47
After interior pH value, in desulfurizing tower 29, add desulfurizing agent by controlling desulfurization pump 48, so circulate, precipitation
Heavy ash in pond 49 is periodically removed, and picks up outward transport；
Claimed 42 by calcium hydroxide feed bin 40, discharger 41, electron helical, frequency conversion rotary feeder 43 forms
The conveyer device of 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 controller 45,
After electron helical claims 42 Weighings, by frequency conversion rotary feeder 43, according to aeration displacement reaction pond
PH value in 44, adjusts the conveying capacity of calcium hydroxide by the mode changing rotating speed, and calcium hydroxide is sent into aeration and put
Change in reaction tank 44；
Desulfurization chemical reaction formula:
SO is absorbed in absorption tower2:
2NaOH+SO2→Na2SO3+H2O
Na2SO3+SO2+H2O→2NaHSO3
SO will be absorbed2Absorbing liquid deliver to aeration displacement reaction pond 44, carry out the oxidation of inferior sulfate radical, suction
Receive regeneration and the precipitation of solid by-product of liquid；
Blast air by roots blower 46, aeration displacement reaction pond 44 occurs oxidation reaction；
Oxidation reaction: Na2SO3+0.5O2→Na2SO4
By adding the calcium hydroxide regeneration to absorbing liquid and the precipitation of solid by-product；
Displacement reaction: Ca (OH)2+Na2SO4+2H2O→NaOH+CaSO4·2H2O
Ca(OH)2+Na2SO3→2NaOH+CaSO3
Ca(OH)2+2NaHSO3→Na2SO3+CaSO3·0.5H2O+0.5H2O
NaOH and Na of regeneration2SO3Can recycle Deng desulfurizing agent；
As can be seen here, NaOH consumes fewer here, actually main consumption after the circulation of Systemic absorption liquid
Being calcium hydroxide, therefore operating cost is relatively low；
When desulfurizing tower 29 is not normally functioning, open desulfurizing tower bypass valve 26, close the electronic air intake of desulfurizing tower
Valve 27, make the flue gas through bag-type dust through main air blower 25, by desulfurizing tower by-pass line 63, then through bypass pipe
Road 60, enters chimney 39 and discharges.
As can be seen here, one-level of the present invention uses circulation dry desulfurization, and doctor solution consumption is few and utilization rate high, follows
During ring, sorbent particle is under mutual rubbing action, and desulfurization degree is up to 90%；Two grades use spray wet method to take off
Sulfur technique, non-blind area, desulfuration efficiency is up to more than 95%；Having desulfuration efficiency high, investment operating cost is low,
Reliability is high, and energy consumption is low, safeguards easily, the advantages such as floor space is little, system length in service life, SO2Discharge
Concentration 30mg/Nm3, dust emission concentration 15mg/Nm3, " thermal power plant is big to be better than GB13223-2011 standard
Gas pollutant emission standard " (SO2＜ 50mg/Nm3, dust emission concentration ＜ 20mg/Nm3), make flue gas row up to standard
Put, it is to avoid to environment.
Claims (1)
1. a flue-gas desulfurizing device, including coal-burning boiler, electronic air inlet valve, reaction tower, cloth
Bag dust collector, main air blower, desulfurizing tower, dehumidifying purifying column, chimney, it is characterised in that: described coal-burning boiler
Be 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 enters with chimney
Mouth connects, and by-pass line is provided with bypass valve, and the outlet of described electronic air inlet valve is connected with reaction tower air intake,
Reaction tower air intake bottom connects taper ash collection slot, and taper ash collection slot connects electric cinder valve, and reaction tower enters
QI KOU top connects has trunnion, the trunnion top calcium hydroxide that has been linked in sequence to dust mouth, water jet, water jet
Top connects exhanst gas outlet, and exhanst gas outlet connects sack cleaner, and sack cleaner bottom connects air
Skewed slot, connects bottom air flume and has middle pressure roots blower, air flume side coupled reaction tower circulating line,
Reaction tower circulating line one tunnel connects recycle feed valve, and another road connects ash silo electrodynamic valve, and ash silo electrodynamic valve is even
Ash storehouse, ash silo bottom connects electric cinder valve, and the reaction tower calcium hydroxide mouth that dusts is sprayed by calcium hydroxide
Pipe connects mixture generator, and mixture generator one tunnel connects high pressure roots blower fan, and mixture generator is connected above
Frequency conversion rotary feeder, frequency conversion rotary feeder connects electron helical and claims, and electron helical claims to connect discharger,
Discharger connects calcium hydroxide dry powder feed bin, and reaction tower water jet connects water pump by pipeline, and water pump connects water
Case, described main air blower import one tunnel is connected with sack cleaner, separately leads up to sack cleaner by-pass line
It is connected with by-pass line, sack cleaner by-pass line is provided with bypass valve of bag dust collector, described main air
Machine outlet is leaded up to desulfurizing tower by-pass line and is connected with by-pass line, desulfurizing tower by-pass line is provided with de-
Sulfur tower bypass valve, another road is connected with desulfurizing tower electronic air inlet valve, and desulfurizing tower electronic air inlet valve enters with desulfurizing tower
QI KOU connects, and desulfurizing tower air intake lower sides is provided with PH and detects controller, and PH detection controller is by control
Cable processed is connected with desulfurization pump, and desulfurizing tower air intake bottom connects aeration displacement reaction pond, aeration by pipeline
Displacement reaction pond connects sedimentation tank, and side, aeration displacement reaction pond is provided with roots blower, and opposite side is provided with
Calcium hydroxide feed bin, calcium hydroxide feed bin connects discharger, and discharger connects electron helical and claims, electron helical
Claiming 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 and detects controller, and aeration displacement reaction pond PH detects controller
Being connected with frequency conversion rotary feeder by controlling cable, sedimentation tank connects regulating reservoir, and sedimentation tank bottom is provided with
The outer discharge pipe of waste liquid, regulating reservoir opposite side is provided with sodium hydroxide storage tank, and regulating reservoir pool side is provided with regulating reservoir
PH detects controller, and regulating reservoir PH detection controller is connected with electric charging valve by controlling cable, desulfurizing tower
Air intake top is provided with nozzle, and nozzle top is provided with demister, and demister top is provided with exhanst gas outlet,
Exhanst gas outlet connects dehumidifying purifying column, is provided with damp proof air filter in dehumidifying purifying column, and dehumidify purifying column
Bottom is provided with the dehumidifying outer discharge pipe of purifying column waste liquid, and nozzle is soft through desulfurizing tower inwall and desulfurizing tower outer wall
Adapter connects, and hose adapter is connected with shower, and shower is fixed on desulfurizing tower outer wall by support, spray
Pipe is connected with feed tube, and feed tube is connected with desulfurization pump, and desulfurization pump connects regulating reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410826166.9A CN105889960A (en) | 2014-12-14 | 2014-12-14 | Flue gas desulfurization device for coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410826166.9A CN105889960A (en) | 2014-12-14 | 2014-12-14 | Flue gas desulfurization device for coal-fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105889960A true CN105889960A (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410826166.9A Pending CN105889960A (en) | 2014-12-14 | 2014-12-14 | Flue gas desulfurization device for coal-fired boiler |
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| CN (1) | CN105889960A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109974021A (en) * | 2017-12-28 | 2019-07-05 | 宜兴市恒邦环保有限公司 | A kind of power plant stack gas treatment process |
| CN111408261A (en) * | 2020-04-23 | 2020-07-14 | 山西海洁星环保设备有限公司 | Integrated flue gas purification device and method based on semi-dry desulfurization |
| CN112076616A (en) * | 2020-09-23 | 2020-12-15 | 浙江浙能技术研究院有限公司 | Dosing device and method based on operation condition of desulfurization tower of coal-fired unit |
| CN115649870A (en) * | 2022-11-14 | 2023-01-31 | 北京天中方环保科技有限公司 | Dry-method calcium-based desulfurization low-positive-pressure pneumatic continuous conveying device and using method thereof |
-
2014
- 2014-12-14 CN CN201410826166.9A patent/CN105889960A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109974021A (en) * | 2017-12-28 | 2019-07-05 | 宜兴市恒邦环保有限公司 | A kind of power plant stack gas treatment process |
| CN111408261A (en) * | 2020-04-23 | 2020-07-14 | 山西海洁星环保设备有限公司 | Integrated flue gas purification device and method based on semi-dry desulfurization |
| CN112076616A (en) * | 2020-09-23 | 2020-12-15 | 浙江浙能技术研究院有限公司 | Dosing device and method based on operation condition of desulfurization tower of coal-fired unit |
| CN115649870A (en) * | 2022-11-14 | 2023-01-31 | 北京天中方环保科技有限公司 | Dry-method calcium-based desulfurization low-positive-pressure pneumatic continuous conveying device and using method thereof |
| CN115649870B (en) * | 2022-11-14 | 2023-03-17 | 北京天中方环保科技有限公司 | Dry-method calcium-based desulfurization low-positive-pressure pneumatic continuous conveying device and using method thereof |
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Application publication date: 20160824 |