CN106152799A - A kind of flue gas of sintering machine denitration device - Google Patents
A kind of flue gas of sintering machine denitration device Download PDFInfo
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- CN106152799A CN106152799A CN201510145944.2A CN201510145944A CN106152799A CN 106152799 A CN106152799 A CN 106152799A CN 201510145944 A CN201510145944 A CN 201510145944A CN 106152799 A CN106152799 A CN 106152799A
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- desulfurizing tower
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Abstract
A kind of flue gas of sintering machine denitration device, including sintering machine, bellows, cyclone dust extractor, sack cleaner, booster fan, desulfurizing tower, dehumidifying purifying column, SCR reactor, blower fan, chimney, it is characterized in that: described sintering machine is linked in sequence bellows, cyclone dust extractor, sack cleaner, booster fan, desulfurizing tower, dehumidifying purifying column, SCR reactor, blower fan, chimney, it is connected between described bellows and cyclone dust extractor and has electric control valve, described fan outlet is connected with desulfurizing tower air intake, desulfurizing tower air intake lower sides is provided with PH and detects controller, PH detection controller is connected with desulfurization pump by controlling cable, desulfurizing tower air intake bottom connects aeration displacement reaction pond by pipeline, aeration displacement reaction pond connects sedimentation tank, side, aeration displacement reaction pond is provided with roots blower.It is high that the present invention has desulfuration efficiency, and investment operating cost is low, safeguards easily, the advantages such as floor space is little, service life of equipment length.
Description
Technical field
The present invention relates to the desulphurization denitration equipment of a kind of flue gas, especially relate to a kind of flue gas of sintering machine and take off
Nitre equipment.
Background technology
At present, coke powder used by SINTERING PRODUCTION and coal dust are during 1200 DEG C of high-temperature firings of sintered machine, former
In material, sulfur, nitrogen generate SO through chemical reaction2, NOx enter sintering flue gas, sintering machine discharge SO2, NOx accounts for
To domestic SO2, a big chunk of NOx emission total amount, be the emission source being only second to thermal power plant, according to burning
The analysis of knot flue gas, has a following features:
(1) change of sintering so2 concentration in flue gas is very fast and fluctuation of concentration amplitude greatly；
(2) flue-gas temperature of sintering discharge generally fluctuates between 100 DEG C～150 DEG C；
(3) dust concentration in sintering flue gas is substantially at 100g/Nm3To 150g/Nm3Between change；
(4) oxygen content of sintering discharge flue gas changes between 14%～18%, and SO in flue gas2Concentration
There is certain corresponding relation in change and the change of oxygen content: the SO in flue gas when oxygen content is on the low side2Concentration is inclined
High；SO in flue gas when oxygen content is higher2Concentration is on the low side；
(5) about containing the nitrogen (by mass) of 0.5～2% in coal, oxidation forms NOx in combustion；
Concentration is substantially at 300g/Nm3To 1000g/Nm3Between change；
(6) water capacity of sintering discharge flue gas is relatively big, generally fluctuates between 8%～10.5%.
In sum, the flue-gas temperature of sintering machine is relatively low, mostly between 100～150 DEG C, residing
Flue gas environmental condition is relatively more severe, oxygen content as higher in dust concentration, flue gas is higher, water capacity is relatively big,
Heavy metal concentration is more high, in the case of using sulphur coal, and sintering device handpiece flue gas SO2Concentration of emission reach
To 6000～8000mg/Nm3, NOx concentration reaches 800～1000g/Nm3, environment is caused severe contamination, but
It is the desulphurization denitration equipment that there is presently no and be applicable to sintering device flue gas.
Summary of the invention
The present invention is directed to the problems referred to above, it is provided that a kind of flue gas of sintering machine denitration device, there is desulfurization, take off
Nitre 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.
The technical scheme is that a kind of flue gas of sintering machine denitration device, including sintering machine, bellows,
Cyclone dust extractor, sack cleaner, booster fan, desulfurizing tower, dehumidifying purifying column, SCR reactor, blower fan,
Chimney, it is characterised in that: described sintering machine is linked in sequence bellows, cyclone dust extractor, sack cleaner, increasing
Pressure fan, desulfurizing tower, dehumidifying purifying column, SCR reactor, blower fan, chimney, described bellows and cyclone dust removal
Connecting between device has electric control valve, described fan outlet to be connected with desulfurizing tower air intake, desulfurizing tower air intake
Lower sides is provided with PH and detects controller, and PH detection controller is connected with desulfurization pump by controlling cable, de-
Sulfur tower air intake bottom connects aeration displacement reaction pond by pipeline, and aeration displacement reaction pond connects sedimentation tank,
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, and electron helical claims to connect frequency conversion rotary feeder,
Frequency conversion rotary feeder connects aeration displacement reaction pond, and it is anti-that aeration displacement reaction pond pool side is provided with aeration displacement
Answering pond PH to detect controller, aeration displacement reaction pond PH detection controller rotates with frequency conversion by controlling cable
Batcher connects, and sedimentation tank connects regulating reservoir, and sedimentation tank bottom is provided with the outer discharge pipe of waste liquid, and regulating reservoir is another
Side is provided with sodium hydroxide storage tank, and regulating reservoir pool side is provided with regulating reservoir PH and detects controller, regulating reservoir PH
Detection controller is connected with electric charging valve by controlling cable, and desulfurizing tower air intake top is provided with nozzle,
Nozzle top is provided with demister, and demister top is provided with exhanst gas outlet, and exhanst gas outlet connects dehumidifying and purifies
Tower, is provided with damp proof air filter, is provided with dehumidifying purifying column bottom dehumidifying purifying column in dehumidifying purifying column
The outer discharge pipe of waste liquid, nozzle is connected through desulfurizing tower inwall with the hose adapter of desulfurizing tower outer wall, hose adapter and spray
Shower pipe connects, and shower is fixed on desulfurizing tower outer wall by support, and shower is connected with feed tube, feed liquor
Pipe is connected with desulfurization pump, and desulfurization pump connects regulating reservoir, is provided with catalyst layer, SCR in the middle of described SCR reactor
Reactor top is connected with ammonia/air mixer, and ammonia/air mixer one tunnel is with dilution ammonia blower fan even
Connecing, another road is connected with ammonia dashpot, and ammonia dashpot is connected with ammonia evaporator.
The invention has the beneficial effects as follows: it is high that the present invention has desulphurization and denitration efficiency, 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.
Compared with prior art, the invention have the advantages that, economic effect:
1) use spray wet desulphurization mode, non-blind area, make desulphurization reaction constantly be sufficiently carried out, desulfurization degree
Up to 98%.
2) NaOH consumes fewer, and after the circulation of Systemic absorption liquid, actually main consumption is calcium hydroxide,
Operating cost is low.
3) be provided with special efficient dehydration demister, be dehydrated, except fog effect good.
4) system is run and is used control circulation fluid pH value control method to guarantee system stable operation.
5) liquid-gas ratio is little, and investment, operating cost are low, and system anticorrosion, anti-wear performance are reliable, and service life is long.
6) after SCR reactor is arranged in sack cleaner, desulfurizing tower, major part dust and toxicity in flue gas
Material removes in sack cleaner, desulfurizing tower, so catalyst life can be greatly prolonged, and its work
Life-span, up to 3～5 years (working life in the flue gas of " the cleanest " is 2～3 years), can be selected simultaneously
With less catalyst exhaust gases passes, it is greatly improved the specific area of catalyst, thus reduces the entirety of catalyst
Consumption, reduces initial cost and catalyst change operating cost.
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.
In Fig. 1, Fig. 2, Fig. 3,1. sintering machine, 2. bellows, 3. electric flow control valve, 4. bag-type dust
Device, 5. booster fan, 6. desulfurizing tower, 7. demister, 8. exhanst gas outlet, 9.Damp proof air filter, 10.
Shower, 11. supports, 12. hose adapters, 13. nozzles, 14. feed tubes, 15. desulfurizing tower air intakes, 16.
Desulfurization pump, 17. calcium hydroxide feed bins, 18. dischargers, 19. electron helicals claim, 20. frequency conversion rotary feeders,
21. aeration displacement reaction ponds, 22. sedimentation tanks, 23. regulating reservoirs, the outer discharge pipe of 24. waste liquids, 25. roots blowers,
26. sodium hydroxide storage tanks, 27. dehumidifying purifying columns, the 28. outer discharge pipes of dehumidifying purifying column waste liquid, 29. blower fans,
30. chimneys, 31. electric charging valves, 32.PH detects controller, and 33. aeration displacement reaction pond PH detections control
Instrument, 34. regulating reservoir PH detect controller, 35. catalyst layers, 36.SCR reactor, 37. dilution ammonia wind
Machine, 38. ammonias/air mixer, 39. ammonia dashpots, 40. ammonia evaporators, 41. cyclone dust extractors.
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 shows, the present invention is a kind of flue gas of sintering machine denitration device, including burning
Knot machine 1, bellows 2, cyclone dust extractor 41, sack cleaner 4, booster fan 5, desulfurizing tower 6, dehumidifying
Purifying column 9, SCR reactor 36, blower fan 29, chimney 30, it is characterised in that: described sintering machine 1 order
Connect bellows 2, cyclone dust extractor 41, sack cleaner 4, booster fan 5, desulfurizing tower 6, dehumidifying purification
Tower 9, SCR reactor 36, blower fan 29, chimney 30, described bellows 2 are connected between cyclone dust extractor 41
Electric control valve 3, the outlet of described blower fan 5 is had to be connected with desulfurizing tower air intake 15, desulfurizing tower air intake 15 times
Portion's sidewall is provided with PH and detects controller 32, and PH detection controller 32 is by controlling cable and desulfurization pump 16
Connecting, desulfurizing tower air intake 15 bottom connects aeration displacement reaction pond 21, aeration displacement reaction pond by pipeline
21 connect sedimentation tank 22, and side, aeration displacement reaction pond 21 is provided with roots blower 25, and opposite side is provided with
Calcium hydroxide feed bin 17, calcium hydroxide feed bin 17 connects discharger 18, and discharger 18 connects electron helical and claims
19, electron helical claims 19 connection frequency conversion rotary feeders 20, and frequency conversion rotary feeder 20 connects aeration displacement
Reaction tank 21, aeration displacement reaction pond 21 pool side is provided with aeration displacement reaction pond PH and detects controller 33,
Aeration displacement reaction pond PH detection controller 33 is connected with frequency conversion rotary feeder 20 by controlling cable, heavy
Pond, shallow lake 22 connects regulating reservoir 23, and sedimentation tank 22 bottom is provided with the outer discharge pipe 24 of waste liquid, and regulating reservoir 23 is another
Side is provided with sodium hydroxide storage tank 26, and regulating reservoir 23 pool side is provided with regulating reservoir PH and detects controller 34,
Regulating reservoir PH detection controller 34 is connected with electric charging valve 31 by controlling cable, desulfurizing tower air intake 15
Top is provided with nozzle 13, and nozzle 13 top is provided with demister 7, and demister 7 top is provided with flue gas and goes out
Mouth 8, exhanst gas outlet 8 connects dehumidifying purifying column 27, is provided with damp proof air filter in dehumidifying purifying column 27
9, it is provided with the outer discharge pipe 28 of dehumidifying purifying column waste liquid bottom dehumidifying purifying column 27, nozzle 13 is through desulfurizing tower
6 inwalls are connected with the hose adapter 12 of desulfurizing tower 6 outer wall, and hose adapter 12 is connected with shower 10, use soft
Adapter 12 purpose is easy for installing, and repair demolition is convenient, and shower 10 is fixed on desulfurizing tower by support 11
On 6 outer walls, shower 10 is connected with feed tube 14, and feed tube 14 is connected with desulfurization pump 16, desulfurization pump
16 connect regulating reservoir 23, and described SCR reactor 36 is middle is provided with catalyst layer 35, on SCR reactor 36
Portion is connected with ammonia/air mixer 38, and ammonia/air mixer 38 1 tunnel is with dilution ammonia blower fan 37 even
Connecing, another road is connected with ammonia dashpot 39, and ammonia dashpot 39 is connected with ammonia evaporator 40.
The work process of the present invention: 120m2Sintering machine 1, exhaust gas volumn 200000Nm3/ h, SO2Concentration
7500mg/Nm3, NOx concentration 850g/Nm3, dust concentration 120mg/Nm3, flue-gas temperature 100～150
DEG C, sintering machine 1 flue gas enters in bellows 2 by the suction function of blower fan 5, arrives connecting each bellows 2
On main pipeline, it is provided with electric flow control valve 3, is used for mating each bellows 2 air quantity, subsequently into cyclone dust removal
Sintering machine 1 flue gas is played the effect of pre-dedusting by device 41, through sintering machine 1 flue gas of cyclone dust extractor 41
Entered sack cleaner 4 by the effect of blower fan 5, sintering machine 1 ash-laden gas played the effect of further dedusting,
Efficiency of dust collection reaches 99.99%, prevents dust from entering desulfurizing tower 6 and produces blocking, through sack cleaner 4
Sintering machine 1 flue gas is entered desulfurizing tower 6 by the effect of blower fan 5, and flue gas from bottom to top, de-by being laid in
During nozzle 13 in the middle part of sulfur tower 6, due to gas-liquid counter current, the doctor solution making nozzle 13 spray is fluidized state,
Making gas-liquid be fully contacted, flue gas, after nozzle 13 sprays, removes water smoke by high efficiency demister, and demister goes out
The concentration of mouth flue fog drip is less than 75mg/m3, prevent water droplet from corroding chimney 30, then through dehumidifying purifying column 27
In damp proof air filter 9, collect the fine solid particle in gas, purify air, remove water droplet, warp further
Cross the flue gas outflow dehumidifying purifying column 27 that dehumidifying purifies, after SCR reactor 36, finally by blower fan 29
Enter chimney 30 with clean flue to be discharged in air.
Use NaOH as desulfurization absorbent, desulfurizing agent is squeezed into desulfurizing tower 6 through desulfurization pump 16 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 22, warp
Supernatant after precipitation Ash Water Separator, sends into regulating reservoir 23, in regulating reservoir 23, when pH value is reduced to one
When determining degree, after measuring the pH value in regulating reservoir 23 by regulating reservoir PH detection controller 34, control electricity
Sodium hydroxide in sodium hydroxide storage tank 26 is continuously replenished in addition regulating reservoir 23 by dynamic charging valve 31, de-
In sulfur tower 6, when pH value is reduced to a certain degree, measured in desulfurizing tower 6 by PH detection controller 32
PH value after, by control desulfurization pump 16 in desulfurizing tower 6, add desulfurizing agent, so circulate, sedimentation tank
Heavy ash in 22 is periodically removed, and picks up outward transport.
Claimed 19 by calcium hydroxide feed bin 17, discharger 18, electron helical, frequency conversion rotary feeder 20 forms
The conveyer device of calcium hydroxide, in aeration displacement reaction pond 21, when pH value is reduced to a certain degree,
After measuring the pH value in aeration displacement reaction pond 21 by aeration displacement reaction pond PH detection controller 33,
After electron helical claims 19 Weighings, by frequency conversion rotary feeder 20, according to aeration displacement reaction pond
PH value in 21, 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 21.
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 21, 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 25, aeration displacement reaction pond 21 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.
Denitrification process: liquefied ammonia is transported to liquid ammonia storage tank by tank car, the liquefied ammonia of output becomes after ammonia evaporator 40
Ammonia, is passed to ammonia dashpot 39 standby；Ammonia in dashpot 39 sends into ammonia/sky after decompression
In gas blender 38, after mixing with the air from dilution ammonia blower fan 37, by spraying the nozzle of ammonia barrier
Spray in flue gas and be sufficiently mixed therewith, subsequently into SCR reactor 36, when flue gas flows through SCR reactor
36 catalyst layer 35 time, occur catalytic reaction, NOx is by the reduction of selectivity:
4NH3+4NO+O2→4N2+6H2O
8NH3+6NO2→7N2+12H2O
In reactor, NOx is reduced to N2And water.
The maximum feature of this equipment is by adding the calcium hydroxide regeneration to absorbing liquid and the analysis of solid by-product
Going out, NaOH consumes fewer, and after the circulation of Systemic absorption liquid, actually main consumption is calcium hydroxide, de-
Sulphur efficiency is up to 98%, and operating cost is relatively low；In the flue gas have catalyst, inject ammonia make reducing agent NOx is entered
Row reduction, in reactor, NOx is reduced to N2And water.
With 120m2As a example by flue gas of sintering machine technique, the present invention compares with conventional equipment, is described as follows:
Note: work per year 330 and calculate.
As can be seen here, it is high that the present invention has desulfuration efficiency, and investment operating cost is low, and reliability is high, and energy consumption is low,
Safeguard easily, the advantages such as floor space is little, system length in service life.
Claims (1)
1. a flue gas of sintering machine denitration device, including sintering machine, bellows, cyclone dust extractor, cloth bag
Cleaner unit, booster fan, desulfurizing tower, dehumidifying purifying column, SCR reactor, blower fan, chimney, its feature exists
In: described sintering machine be linked in sequence bellows, cyclone dust extractor, sack cleaner, booster fan, desulfurizing tower,
Dehumidifying purifying column, SCR reactor, blower fan, chimney, be connected between described bellows and cyclone dust extractor have electronic
Regulation valve, described fan outlet is connected with desulfurizing tower air intake, and 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 leads to
Piping connects aeration displacement reaction pond, and aeration displacement reaction pond connects sedimentation tank, aeration displacement reaction pond one
Side is provided with roots blower, and opposite side is provided with calcium hydroxide feed bin, and calcium hydroxide feed bin connects discharger,
Discharger connects electron helical and claims, and electron helical claims to connect frequency conversion rotary feeder, and frequency conversion rotary feeder is even
Connecing aeration displacement reaction pond, aeration displacement reaction pond pool side is provided with aeration displacement reaction pond PH and detects controller,
Aeration displacement reaction pond PH detection controller is connected with frequency conversion rotary feeder by controlling cable, and sedimentation tank is even
Connecing 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 is connected with electric charging valve, and desulfurizing tower air intake top is provided with nozzle, and nozzle top is provided with except mist
Device, demister top is provided with exhanst gas outlet, and exhanst gas outlet connects dehumidifying purifying column, sets in dehumidifying purifying column
It is equipped with damp proof air filter, bottom dehumidifying purifying column, is provided with the outer discharge pipe of dehumidifying purifying column waste liquid, nozzle
Hose adapter through desulfurizing tower inwall with desulfurizing tower outer wall is connected, and hose adapter is connected with shower, and shower leads to
Crossing support to be fixed on desulfurizing tower outer wall, shower is connected with feed tube, and feed tube is connected with desulfurization pump, de-
Sulfur pump connects regulating reservoir, is provided with catalyst layer in the middle of described SCR reactor, and SCR reactor top and ammonia/
Air mixer connects, and ammonia/air mixer one tunnel is connected with dilution ammonia blower fan, and another road is delayed with ammonia
Jet-bedding connects, and ammonia dashpot is connected with ammonia evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510145944.2A CN106152799A (en) | 2015-03-26 | 2015-03-26 | A kind of flue gas of sintering machine denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510145944.2A CN106152799A (en) | 2015-03-26 | 2015-03-26 | A kind of flue gas of sintering machine denitration device |
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| CN106152799A true CN106152799A (en) | 2016-11-23 |
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| CN201510145944.2A Pending CN106152799A (en) | 2015-03-26 | 2015-03-26 | A kind of flue gas of sintering machine denitration device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106880996A (en) * | 2017-03-28 | 2017-06-23 | 中国科学院广州能源研究所 | The method of dust and discharged nitrous oxides and the device of the method is realized in a kind of control tail gas |
| CN107441899A (en) * | 2017-07-19 | 2017-12-08 | 哈尔滨工程大学 | A kind of boat diesel engine regenerative sodium alkali desulfurization system |
| CN111482071A (en) * | 2020-04-14 | 2020-08-04 | 中钢集团天澄环保科技股份有限公司 | Sintering flue gas multi-pollutant cooperative purification and waste heat utilization system and process |
-
2015
- 2015-03-26 CN CN201510145944.2A patent/CN106152799A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106880996A (en) * | 2017-03-28 | 2017-06-23 | 中国科学院广州能源研究所 | The method of dust and discharged nitrous oxides and the device of the method is realized in a kind of control tail gas |
| CN107441899A (en) * | 2017-07-19 | 2017-12-08 | 哈尔滨工程大学 | A kind of boat diesel engine regenerative sodium alkali desulfurization system |
| CN111482071A (en) * | 2020-04-14 | 2020-08-04 | 中钢集团天澄环保科技股份有限公司 | Sintering flue gas multi-pollutant cooperative purification and waste heat utilization system and process |
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