CN106139879A - A kind of fire coal boiler fume denitration in the stove wet desulphurization device - Google Patents
A kind of fire coal boiler fume denitration in the stove wet desulphurization device Download PDFInfo
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- CN106139879A CN106139879A CN201510146057.7A CN201510146057A CN106139879A CN 106139879 A CN106139879 A CN 106139879A CN 201510146057 A CN201510146057 A CN 201510146057A CN 106139879 A CN106139879 A CN 106139879A
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Abstract
A kind of fire coal boiler fume denitration in the stove wet desulphurization device, including coal-burning boiler, flue gas Online Monitoring Control device, sack cleaner, blower fan, desulfurizing tower, dehumidifying purifying column, chimney, it is characterized in that: described coal-burning boiler is linked in sequence flue gas Online Monitoring Control device, sack cleaner, blower fan, desulfurizing tower, dehumidifying purifying column, chimney, described flue gas Online Monitoring Control device connects frequency conversion rotary feeder, frequency conversion rotary feeder is connected above electron helical and claims, electron helical claims to connect discharger, discharger connects urea granules feed bin, mixture generator is connected below frequency conversion rotary feeder, mixture generator one tunnel connects high pressure roots blower fan, urea granules playpipe of separately leading up to connects urea granules jet, urea granules jet is positioned at above the sidewall of coal-burning boiler burner hearth.The present invention can remove SO in fire coal boiler fume2, the noxious pollutant such as nitrogen oxides, make flue gas qualified discharge, it is to avoid to environment.
Description
Technical field
The present invention relates to a kind of fire coal boiler fume denitration in the stove wet desulphurization device, be particularly used for clean
Change the flue gas that coal-burning boiler produces, belong 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, it addition, the concentration of emission of NOx reaches 600～800g/Nm3, environment is caused severe contamination.
Summary of the invention
It is an object of the invention to overcome above-mentioned weak point, thus a kind of fire coal boiler fume denitration in the stove is provided
Wet desulphurization device, this device denitrating technique is mainly with urea granules as reducing agent, aoxidizes with nitrogen in burner hearth
Thing reacts, and in burner hearth, NOx is reduced to N2And water；Use spray wet desulfurizing process, non-blind area, take off
Sulphur efficiency is high, and investment operating cost is low, and reliability is high, and energy consumption is low, safeguards that easily floor space is little, system
Service life the advantage such as length, SO2Concentration of emission 30mg/Nm3, the concentration of emission 80mg/Nm of NOx3, dust
Concentration of emission 15mg/Nm3, it is better than GB13223-2011 standard " fossil-fuel power plant atmospheric pollutant emission standard "
(SO2＜ 50mg/Nm3, NOx ＜ 100mg/Nm3, dust emission concentration ＜ 20mg/Nm3), make flue gas qualified discharge,
Avoid environment.
The technical scheme is that a kind of fire coal boiler fume denitration in the stove wet desulphurization device, including combustion
Coal burning boiler, flue gas Online Monitoring Control device, sack cleaner, blower fan, desulfurizing tower, dehumidifying purifying column,
Chimney, it is characterised in that: described coal-burning boiler is linked in sequence flue gas Online Monitoring Control device, bag-type dust
Device, blower fan, desulfurizing tower, dehumidifying purifying column, chimney, described flue gas Online Monitoring Control device connects frequency conversion
Rotary feeder, frequency conversion rotary feeder is connected above electron helical and claims, and electron helical claims to connect discharger,
Discharger connects urea granules feed bin, connects mixture generator, mixture generator below frequency conversion rotary feeder
One tunnel connects high pressure roots blower fan, and urea granules playpipe of separately leading up to connects urea granules jet, urine
Crude granule jet is positioned at above the sidewall of coal-burning boiler burner hearth, described fan outlet and electronic air inlet valve import
Between connecting bypass pipeline, by-pass line is connected with chimney import, and by-pass line is provided with bypass valve, institute
Stating electronic air inlet valve outlet to be connected with desulfurizing tower air intake, desulfurizing tower air intake lower sides is provided with PH detection
Controller, PH detection controller is connected with desulfurization pump by controlling cable, and desulfurizing tower air intake bottom is by pipe
Road connects aeration displacement reaction pond, and aeration displacement reaction pond connects sedimentation tank, and side, aeration displacement reaction pond sets
Being equipped with roots blower, opposite side is provided with calcium hydroxide feed bin, and calcium hydroxide feed bin connects discharger, discharging
Device connects electron helical and claims, and electron helical claims to connect frequency conversion rotary feeder, and frequency conversion rotary feeder connects exposure
Gas displacement reaction pond, aeration displacement reaction pond pool side is provided with aeration displacement reaction pond PH and detects controller, exposes
Gas displacement reaction pond PH detection controller is connected with frequency conversion rotary feeder by controlling cable, and 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
Being connected with electric charging valve, 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 in dehumidifying purifying column
Damp proof 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 by propping up
Frame is fixed on desulfurizing tower outer wall, and shower is connected with feed tube, and feed tube is connected with desulfurization pump, desulfurization pump
Connect regulating reservoir.
The invention has the beneficial effects as follows: this device denitrating technique is mainly with urea granules as reducing agent, with burner hearth
Middle reaction of nitrogen oxides, in burner hearth, NOx is reduced to N2And water；Use spray wet desulfurizing process, nothing
Blind area, desulfuration efficiency is high, and investment operating cost is low, and reliability is high, and energy consumption is low, safeguards easily, floor space
Little, the advantage such as system length in service life, SO2Concentration of emission 30mg/Nm3, the concentration of emission 80mg/Nm of NOx3,
Dust emission concentration 15mg/Nm3, it is better than GB13223-2011 standard " fossil-fuel power plant atmospheric pollutant emission standard "
(SO2＜ 50mg/Nm3, NOx ＜ 100mg/Nm3, dust emission concentration ＜ 20mg/Nm3), make flue gas qualified discharge,
Avoid environment.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
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 portion enlarged drawing in Fig. 1.
In Fig. 1, Fig. 2, Fig. 3, Fig. 4,1. coal-burning boiler, 2. sack cleaner, 3. blower fan, the most electronic
Air inlet valve, 5. desulfurizing tower air intake, 6. desulfurizing tower, 7. demister, 8. exhanst gas outlet, 9. shower, 10.
Support, 11. hose adapters, 12. nozzles, 13. feed tubes, 14.PH detects controller, 15. desulfurization pumps, and 16.
Damp proof air filter, 17. dehumidifying purifying columns, the 18. outer discharge pipes of dehumidifying purifying column waste liquid, 19. calcium hydroxide
Feed bin, 20. dischargers, 21. electron helicals claim, 22. frequency conversion rotary feeders, 23. aeration displacement reaction ponds,
24. aeration displacement reaction pond PH detect controller, 25. roots blowers, 26. sedimentation tanks, the outer comb of 27. waste liquids
Road, 28. electric charging valves, 29. sodium hydroxide storage tanks, 30. regulating reservoir PH detection controllers, 31. regulating reservoirs,
32. by-pass lines, 33. bypass valves, 34. chimneys, 35. urea granules feed bins, 36. dischargers, 37. electronics
Spiral claims, 38. frequency conversion rotary feeders, 39. high pressure roots blower fans, 40. mixture generators, 41. carbamide
Grain playpipe, 42. urea granules jets, 43. flue gas Online Monitoring Control devices.
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 fire coal boiler fume denitration in the stove wet method
Desulfurizer, including coal-burning boiler 1, flue gas Online Monitoring Control device 43, sack cleaner 2, blower fan 3,
Desulfurizing tower 6, dehumidifying purifying column 17, chimney 34, it is characterised in that: described coal-burning boiler 1 is linked in sequence cigarette
Gas Online Monitoring Control device 43, sack cleaner 2, blower fan 3, desulfurizing tower 6, dehumidifying purifying column 17, cigarette
Chimney 34, described flue gas Online Monitoring Control device 43 connects frequency conversion rotary feeder 38, and frequency conversion rotates feed
Machine 38 is connected above electron helical and claims 37, and electron helical claims 37 connection dischargers 36, and discharger 36 connects
Urea granules feed bin 35, connects mixture generator 40, mixture generator 40 below frequency conversion rotary feeder 38
One tunnel connects high pressure roots blower fan 39, and urea granules playpipe 41 of separately leading up to connects urea granules jet
42, urea granules jet 42 is positioned at above the sidewall of coal-burning boiler 1 burner hearth, the outlet of described blower fan 3 and electricity
Connecting bypass pipeline 32 between dynamic air inlet valve 4 import, by-pass line 32 is connected with chimney 34 import, bypass
Being provided with bypass valve 33 on pipeline 32, the outlet of described electronic air inlet valve 4 is connected with desulfurizing tower air intake 5, de-
Sulfur tower air intake 5 lower sides is provided with PH and detects controller 14, and PH detection controller 14 is by controlling electricity
Cable is connected with desulfurization pump 15, and desulfurizing tower air intake 5 bottom connects aeration displacement reaction pond 23 by pipeline, exposes
Gas displacement reaction pond 23 connects sedimentation tank 26, and side, aeration displacement reaction pond 23 is provided with roots blower 25,
Opposite side is provided with calcium hydroxide feed bin 19, and calcium hydroxide feed bin 19 connects discharger 20, and discharger 20 is even
Connecing electron helical and claim 21, electron helical claims 21 connection frequency conversion rotary feeders 22, frequency conversion rotary feeder 22
Connecting aeration displacement reaction pond 23, aeration displacement reaction pond 23 pool side is provided with aeration displacement reaction pond PH inspection
Surveying controller 24, aeration displacement reaction pond PH detection controller 24 rotates feed by controlling cable with frequency conversion
Machine 22 connects, and sedimentation tank 26 connects regulating reservoir 31, and sedimentation tank 26 bottom is provided with the outer discharge pipe 27 of waste liquid,
Regulating reservoir 31 opposite side is provided with sodium hydroxide storage tank 29, and regulating reservoir 31 pool side is provided with regulating reservoir PH detection
Controller 30, regulating reservoir PH detection controller 30 is connected with electric charging valve 28 by controlling cable, desulfurization
Tower air intake 5 top is provided with nozzle 12, and nozzle 12 top is provided with demister 7, and demister 7 top sets
Being equipped with exhanst gas outlet 8, exhanst gas outlet 8 connects dehumidifying purifying column 17, is provided with damp proof in dehumidifying purifying column 17
Air filter 16, is provided with the outer discharge pipe 18 of dehumidifying purifying column waste liquid, nozzle bottom dehumidifying purifying column 17
12 are connected through desulfurizing tower 6 inwall with the hose adapter 11 of desulfurizing tower 6 outer wall, hose adapter 11 and shower 9
Connecting, shower 9 is fixed on desulfurizing tower 6 outer wall by support 10, and shower 9 is with feed tube 13 even
Connecing, feed tube 13 is connected with desulfurization pump 15, and desulfurization pump 15 connects regulating reservoir 31.
The work process of the present invention: 170t/h coal-burning boiler 1, exhaust gas volumn 380000m3/ h, fume emission temperature
Spend 120～160 DEG C, SO2Concentration 5000～6000mg/Nm3, the concentration 600～800mg/Nm of NOx3, powder
Dust concentration 15～30g/Nm3, oxygen content is 5%～8%；
Claimed 37 by urea granules feed bin 35, discharger 36, electron helical, frequency conversion rotary feeder 38, high
The groups such as pressure roots blower 39, mixture generator 40, urea granules playpipe 41, urea granules jet 42
The urea granules injection apparatus become；Flue gas Online Monitoring Control device 43 is to the exhaust gas volumn of coal-burning boiler 1 and life
The amount becoming NOx detects, and feeds back to PLC control system, and PLC control system calculates the consumption of carbamide
Amount, after electron helical claims 37 Weighings, by frequency conversion rotary feeder 38, according to operating mode, with change
The mode of rotating speed adjusts conveying capacity, and conveying capacity sends into blender 40, from the wind-force of high pressure roots blower fan 39,
By urea granules playpipe 41, the urea granules falling into blender 40 is sent into urea granules jet 42 enter
Entering in coal-burning boiler 1 burner hearth, in coal-burning boiler 1 burner hearth, the nitrogen oxides in urea granules and flue gas is sent out
Biochemical reaction:
2CO(NH2)2+4NO+O2=4N2+4H2O+2CO2
4CO(NH2)2+4NO2=6N2+8H2O+2CO2
In burner hearth, NOx is reduced to N2And water；
The flue gas of coal-burning boiler 1, after denitration processes, enters sack cleaner 2 by the suction function of blower fan 3,
Coal-burning boiler 1 ash-laden gas plays the effect of dedusting, and efficiency of dust collection is high, prevents dust from entering desulfurizing tower 6
Produce blocking, through sack cleaner 2 coal-burning boiler 1 flue gas enter desulfurizing tower 6, flue gas from bottom to top,
When by being laid in the nozzle 12 in the middle part of desulfurizing tower 6, due to gas-liquid counter current, make that nozzle 12 sprays is de-
Sulfur liquid is fluidized state, makes gas-liquid be fully contacted, and flue gas is after nozzle 12 sprays, by high efficiency demister 7
Removing water smoke, in demister 7 exiting flue gas, the concentration of droplet is less than 75mg/m3, prevent water droplet from corroding chimney 34,
Damp proof air filter 16 in dehumidifying purifying column 17, collects the fine solid particle in gas, purifies air again,
Remove water droplet further, be finally discharged in air by chimney 34；
Use NaOH as desulfurization absorbent, desulfurizing agent is squeezed into desulfurizing tower 6 through desulfurization pump 15 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 6
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 26, warp
Supernatant after precipitation Ash Water Separator, sends into regulating reservoir 31, in regulating reservoir 31, when pH value is reduced to one
When determining degree, after measuring the pH value in regulating reservoir 31 by regulating reservoir PH detection controller 30, control electricity
Sodium hydroxide in sodium hydroxide storage tank 29 is continuously replenished in addition regulating reservoir 31 by dynamic charging valve 28, de-
In sulfur tower 6, when pH value is reduced to a certain degree, measured in desulfurizing tower 6 by PH detection controller 14
PH value after, by control desulfurization pump 15 in desulfurizing tower 6, add desulfurizing agent, so circulate, sedimentation tank
Heavy ash in 26 is periodically removed, and picks up outward transport；
Claimed 21 by calcium hydroxide feed bin 19, discharger 20, electron helical, frequency conversion rotary feeder 22 forms
The conveyer device of calcium hydroxide, in aeration displacement reaction pond 23, when pH value is reduced to a certain degree,
After measuring the pH value in aeration displacement reaction pond 23 by aeration displacement reaction pond PH detection controller 24,
After electron helical claims 21 Weighings, by frequency conversion rotary feeder 22, according to aeration displacement reaction pond
PH value in 23, 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 23；
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 23, carry out the oxidation of sulfurous sulfur root, suction
Receive regeneration and the precipitation of solid by-product of liquid；
Blast air by roots blower 25, aeration displacement reaction pond 23 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 6 is not normally functioning, open bypass valve 33, close electronic air inlet valve 4, make through cloth
The flue gas of bag dedusting, enters chimney 34 by by-pass line 33 again through blower fan 3 and discharges.
As can be seen here, apparatus of the present invention denitrating technique is mainly with urea granules as reducing agent, with nitrogen oxygen in burner hearth
Compound is reacted, and in burner hearth, NOx is reduced to N2And water；Use and spray wet desulfurizing process, non-blind area,
Desulfuration efficiency is high, and investment operating cost is low, and reliability is high, and energy consumption is low, safeguards that easily floor space is little, is
The advantages such as system length in service life, SO2Concentration of emission 30mg/Nm3, the concentration of emission 80mg/Nm of NOx3, powder
Dirt concentration of emission 15mg/Nm3, it is better than GB13223-2011 standard " fossil-fuel power plant atmospheric pollutant emission standard "
(SO2＜ 50mg/Nm3, NOx ＜ 100mg/Nm3, dust emission concentration ＜ 20mg/Nm3), make flue gas qualified discharge,
Avoid environment.
Claims (1)
1. a fire coal boiler fume denitration in the stove wet desulphurization device, supervises online including coal-burning boiler, flue gas
Observing and controlling device, sack cleaner, blower fan, desulfurizing tower, dehumidifying purifying column, chimney, it is characterised in that:
Described coal-burning boiler be linked in sequence flue gas Online Monitoring Control device, sack cleaner, blower fan, desulfurizing tower,
Dehumidifying purifying column, chimney, described flue gas Online Monitoring Control device connects frequency conversion rotary feeder, and frequency conversion is revolved
Turning batcher to be connected above electron helical and claim, electron helical claims to connect discharger, and discharger connects urea granules
Feed bin, connects mixture generator below frequency conversion rotary feeder, mixture generator one tunnel connects high pressure roots wind
Machine, urea granules playpipe of separately leading up to connects urea granules jet, and urea granules jet is positioned at combustion
Above the sidewall of coal burning boiler burner hearth, connecting bypass pipeline between described fan outlet 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
Desulfurizing tower air intake connects, and desulfurizing tower air intake lower sides is provided with PH and detects controller, and PH detects control
Instrument is connected with desulfurization pump by controlling cable, and desulfurizing tower air intake bottom connects aeration displacement reaction by pipeline
Pond, aeration displacement reaction pond connects sedimentation tank, and side, aeration displacement reaction pond is provided with roots blower, another
Side is provided with calcium hydroxide feed bin, and calcium hydroxide feed bin connects discharger, and discharger connects electron helical and claims,
Electron helical claims to connect frequency conversion rotary feeder, and 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 examines
Surveying controller and be connected with frequency conversion rotary feeder by controlling cable, sedimentation tank connects regulating reservoir, under sedimentation tank
Portion is provided with the outer discharge pipe of waste liquid, and regulating reservoir opposite side is provided with sodium hydroxide storage tank, and regulating reservoir pool side is arranged
Having regulating reservoir PH to detect controller, regulating reservoir PH detection controller is by controlling cable with electric charging valve even
Connecing, desulfurizing tower air intake top is provided with nozzle, and nozzle top is provided with demister, and demister top is arranged
Having exhanst gas outlet, exhanst gas outlet connects dehumidifying purifying column, is provided with damp proof air filter in dehumidifying purifying column,
Being provided with the outer discharge pipe of dehumidifying purifying column waste liquid bottom dehumidifying purifying column, nozzle passes desulfurizing tower inwall and desulfurization
The hose adapter of tower outer wall connects, and hose adapter is connected with shower, and shower is fixed on outside desulfurizing tower by support
On wall, shower is connected with feed tube, and feed tube is connected with desulfurization pump, and desulfurization pump connects regulating reservoir.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510146057.7A CN106139879A (en) | 2015-03-26 | 2015-03-26 | A kind of fire coal boiler fume denitration in the stove wet desulphurization device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510146057.7A CN106139879A (en) | 2015-03-26 | 2015-03-26 | A kind of fire coal boiler fume denitration in the stove wet desulphurization device |
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| CN106139879A true CN106139879A (en) | 2016-11-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106876748A (en) * | 2017-03-10 | 2017-06-20 | 同济大学 | A kind of integrated fuel storage device based on liquid hydrogen storage |
| CN108443713A (en) * | 2018-04-04 | 2018-08-24 | 江苏苏亚迪炭材有限公司 | Pot type burner gas bypass valve device for preventing leakage |
| CN112657300A (en) * | 2019-10-15 | 2021-04-16 | 中石化南京化工研究院有限公司 | Sulfuric acid tail gas treatment process |
-
2015
- 2015-03-26 CN CN201510146057.7A patent/CN106139879A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106876748A (en) * | 2017-03-10 | 2017-06-20 | 同济大学 | A kind of integrated fuel storage device based on liquid hydrogen storage |
| CN106876748B (en) * | 2017-03-10 | 2023-08-04 | 同济大学 | Integrated fuel storage device based on liquid hydrogen storage |
| CN108443713A (en) * | 2018-04-04 | 2018-08-24 | 江苏苏亚迪炭材有限公司 | Pot type burner gas bypass valve device for preventing leakage |
| CN112657300A (en) * | 2019-10-15 | 2021-04-16 | 中石化南京化工研究院有限公司 | Sulfuric acid tail gas treatment process |
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