CN109529566A - Novel fume cleaning method and apparatus - Google Patents
Novel fume cleaning method and apparatus Download PDFInfo
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- CN109529566A CN109529566A CN201811060762.5A CN201811060762A CN109529566A CN 109529566 A CN109529566 A CN 109529566A CN 201811060762 A CN201811060762 A CN 201811060762A CN 109529566 A CN109529566 A CN 109529566A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/306—Alkali metal compounds of potassium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The present invention relates to novel fume cleaning method and apparatus.The novel fume cleaning method comprising step: 1), by high-temperature flue gas with lye mixing, and rapid cooling is to 100 DEG C or less, sour gas in flue gas is neutralized by lye, and volatile heavy metal is condensate in lye, and particulate matter is absorbed by lye, flue gas is discharged, and obtains solution；2), the solution ph for obtaining step 1) is adjusted to 8-11.5, so that the heavy metal in solution is converted into hydroxide precipitating；3), the NO in flue gas is oxidized to high-valence state nitrogen oxides using ozone oxidation by the flue gas obtained after step 1) processing；Flue gas is inputted into scrubbing tower alkali liquid washing again, lye absorbs the sour gas in flue gas and neutralized the heavy metal and particulate matter in the absorption flue gas of the lye in scrubbing tower；Flue gas is discharged；4) pH value of the solution in scrubbing tower, is adjusted to 8-11.5, and heavy metal is made to be converted into hydroxide precipitating.The present invention can be to avoid the blockage problem for using atomizer to easily cause.
Description
Technical field
The present invention relates to a kind of novel fume cleaning method and apparatus.
Background technique
The processing method of one of flue gas, after flue gas flue-gas temperature after residual heat boiler for exchanging heat drops to 500 DEG C or so
Into the half-dried extracting tower of chilling, flue gas completes chilling and depickling in the process.Flue-gas temperature is in quenching process by 500 DEG C
200 DEG C are down to, then flue gas respectively enters SCR denitration reaction device dry type extracting tower and the cloth bag with active carbon injection apparatus removes
Dirt device completes low-temperature denitration, depickling dedusting and absorption in the process, it is therefore an objective to remove removing heavy metals and dioxin, flue gas is most laggard
Enter wet scrubber tower further to complete after depickling through smoke stack emission.
In the above-mentioned methods, lye is used to cool down flue gas so that flue-gas temperature is in 1s during flue gas chilling is half-dried
It is interior by 500 DEG C be reduced to 200 DEG C hereinafter, the process control is required it is high, should be by the very fast reduction of flue-gas temperature, and cannot
Cause " wet wall " that tower body is caused to corrode because spraying into excess water, and the short grained atomization alkali used in quenching process
Liquid is generated by the atomizer of high-quality, atomizer in use inevitably because of mechanical friction or fouling blockage,
Therefore frequent maintenance and replacement are needed.The SCR denitration of mainstream is metal-oxide during SCR low-temperature denitration,
This kind of catalyst is that nano-titanium dioxide is carrier, using vanadic anhydride, tungstic acid as active constituent.These catalyst inactivations
There is very strong toxicity afterwards, need further to dispose.Furthermore alkali meeting used by chilling is half-dried in this process route and dry method
Enter bag filter in the form of particulate matter, artificially increases the place that the particle concentration in flue gas increases bag filter
Set load.Still in the secondary flying ash that bag filter is discharged, these fly most of effumability heavy metal in flue gas
Ash needs further disposition.And since cloth bag at this stage contains PTFE material mostly, in these cloth bags after 2-3 use
Be also required to be disposed by burning, the release of fluorine element had in disposal process, thus increase gas cleaning difficulty and
The requirement for anticorrosion of system.
Summary of the invention
An object of the present invention be in order to overcome it is in the prior art at least one is insufficient, a kind of equipment is provided and uses the longevity
Order long novel fume cleaning method and apparatus.
In order to achieve the above object, the invention is realized by the following technical scheme:
A kind of novel fume cleaning method, which is characterized in that comprising steps of
1), high-temperature flue gas is mixed with lye, rapid cooling is to 100 DEG C hereinafter, the sour gas in flue gas is by lye
With volatile heavy metal is condensate in lye, and particulate matter is absorbed by lye, and flue gas is discharged, and obtains solution；
2), the solution ph for obtaining step 1) is adjusted to 8-11.5, so that the heavy metal in solution is converted into hydroxide
Object precipitating；
3), the NO in flue gas is oxidized to high-valence state nitrogen using ozone oxidation by the flue gas obtained after step 1) processing
Oxide；Flue gas is inputted into scrubbing tower alkali liquid washing again, lye absorbs the sour gas in flue gas and neutralized scrubbing tower
Interior lye absorbs the heavy metal and particulate matter in flue gas；Flue gas is discharged；
4) pH value of the solution in scrubbing tower, is adjusted to 8-11.5, and heavy metal is made to be converted into hydroxide precipitating.
According to one embodiment of present invention, in step 1), liquid-gas ratio 1-20L/m3。
According to one embodiment of present invention, the temperature of step 1) high temperature flue gas is 500 DEG C or more.
According to one embodiment of present invention, further include step 1-1 before the step 1)), waste heat is carried out to flue gas
Recycling and denitration process, then enter back into step 1).
According to one embodiment of present invention, step 2) and step 4) generate solution and handle through filters pressing, recycle hydroxide
Precipitating.
According to one embodiment of present invention, in the step 3), liquid-gas ratio 1-20L/m3。
It according to one embodiment of present invention, further include step 5) after step 4), the flue gas being discharged after washed tower
Into wet electrical dust precipitator processing, it is then exhausted from after removing particulate matter and water droplet.
According to one embodiment of present invention, it in the step 5), through wet electrical dust precipitator treated flue gas, is heated to
Discharge after 130 DEG C or more.
According to one embodiment of present invention, further include step 1-1 before the step 1)), waste heat is carried out to flue gas
Recycling and denitration process, then enter back into step 1)；The waste-heat water producing water vapor of off-gas recovery, water vapour is for heating
Step 5) flue gas obtained.
According to one embodiment of present invention, the lye described in the step 1 and 3 is Ca (OH)2、NaOH、KOH、
NaHCO3、Na2CO3、K2CO3、KHCO3And/or Ca (HCO3)2Equal solution.
According to one embodiment of present invention, the flue gas is ash melting flue gas.
According to one embodiment of present invention, the flue gas is rubbish or castoff burning or the generated flue gas that gasifies.
The rubbish can be house refuse, be also possible to industrial refuse.If rubbish or the suitable burning disposal of waste,
Suitable for the method for the present invention.
Flue gas purifying equipment, which is characterized in that including chilling extracting tower, the chilling depickling tower structure includes from top to bottom
Straightway, contraction section, aditus laryngis section and expansion segment；Bore is unanimous between the higher and lower levels inside the straightway, the upper end be provided with for flue gas into
The opening entered；Contraction section upper end bore is greater than lower end bore, and the ratio between the upper end bore and lower end bore are 1.1-20:1, receives
Contracting section upper end is connected to straightway, and lower end is connected to aditus laryngis section；Aditus laryngis section bore is identical as contraction section lower end bore；Aditus laryngis section is certainly
It is identical up to lower relative aperture；Aditus laryngis section upper end is connected to contraction section lower end, and lower end is connected to expansion segment；Expansion segment upper end bore is under
The ratio between port diameter is 1:1.5-20.
According to one embodiment of present invention, the flue gas purifying equipment further includes denitration and waste heat recovery apparatus, solution
Recycling can, oxidation reaction tower, scrubbing tower, wet-esp and heater；The denitration and waste heat recovery apparatus, chilling depickling
Tower, solution recovery tank, oxidation reaction tower, scrubbing tower, wet-esp and heater are sequentially communicated.
Novel fume cleaning method and apparatus in the present invention, can be with while carrying out efficient depickling, dedusting to flue gas
Volatile heavy metal is collected, this method is conducive to concentrating volatile heavy metal, to recycle these heavy metals, reduces
Corrosion of the flue gas to equipment.And system does not need cloth bag, and secondary flying ash produces during avoiding similar flue gas ash removal well
Raw drawback reduces secondary pollution.It, can be in quenching process directly with a large amount of lye to cigarette using the equipment in the present invention
Gas cooling, flue-gas temperature are down to 100 DEG C hereinafter, avoiding the blockage problem easily caused using atomizer by 500 DEG C, it is easier to
Ground controls flue gas purification system, while reducing system maintenance cost.
Detailed description of the invention
Fig. 1 is the flue gas purifying equipment structural schematic diagram in the present invention.
Fig. 2 is chilling extracting tower structural schematic diagram used in the present invention.
Specific embodiment
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Embodiment 1
A kind of novel novel fume cleaning method, as shown in Figure 1, itself the following steps are included:
Step 1-1), waste heat recycling and denitration process are carried out to the high-temperature flue gas that gasification reaction generates, this step can be used
6 recovery waste heat of heat recovery boiler shown in FIG. 1.The waste heat of recycling is allowed to generate water vapour for heating water, is used for subsequent step
Suddenly.After waste heat recovery processing, flue-gas temperature is down to 500 DEG C or so, is 480 DEG C -600 DEG C.Flue gas actual temp regards actual conditions
Depending on, it is usually preferred to it is no more than 600 DEG C.
In step 1), this step, chilling extracting tower 1 as shown in Figure 2 is used.Chilling extracting tower 1 used in the present invention,
Its structure includes straightway 11, contraction section 12 from top to bottom, aditus laryngis section 13 and expansion segment 14.One above and below 11 inside bore of straightway
It causes, the upper end is provided with the opening entered for flue gas.12 upper end bore of contraction section is greater than lower end bore, the upper end bore and lower end
The ratio between bore is preferably 1.1-20:1, specific ratio depending on contraction section height, can be 1.1,2,3.5,5,8,11.5,
13,15.6,18.7 or 20:1 etc..Contraction section 12 is higher, then the upper end bore and lower end bore ratio are bigger.It is used in the present embodiment
1.5:1.Contraction section 12 is from top to bottom in contraction-like.12 upper end of contraction section is connected to straightway 11, and lower end is connected to aditus laryngis section 13.
13 bore of aditus laryngis section is suitable with 12 lower end bore of contraction section, preferably identical.Bore is preferably identical from top to bottom for aditus laryngis section 13.Aditus laryngis
13 upper ends of section are connected to 12 lower end of contraction section, and lower end is connected to expansion segment 14.14 upper end relative aperture lower end bore of expansion segment is small,
Ratio is preferably 1:1.5-20, can be 1.1,2,5,8,11.5,13,15.6,18.7 or 20:1 etc..It is expanded in the present embodiment
14 upper end bores of section and lower end bore ratio are 1:2.5.
Step 1-1 will be come from) the high-temperature flue gas of waste heat boiler enter from straightway 11, lye self-constriction section 12 or aditus laryngis
Section 13 sprays into.Liquid-gas ratio is 1-20L/m3, preferably 5-15L/m3, specific ratio can be 1.1,1.8,2.5,5,7.6,
8.4、2、10、11、12.5、13、15、16、18、20L/m38L/m is used Deng, the present embodiment3.Lye is Ca (OH)2、NaOH、
KOH、NaHCO3、Na2CO3、K2CO3、KHCO3And/or Ca (HCO3)2Equal solution.Lye is NaOH solution in the present embodiment.Due to
Penetrating lye amount is larger, and liquid-gas ratio is higher, therefore flue gas and lye come into full contact in aditus laryngis section 12, flue-gas temperature quilt in 1 second
It is reduced to 100 DEG C rapidly hereinafter, processed flue-gas temperature actual temp can be different because of liquid-gas ratio specific value, as long as
Lower than 100 DEG C.Sour gas such as HCl, SO in flue gas2It being neutralized by lye, volatile heavy metal is condensate in lye,
Grain object is absorbed by lye.Then flue gas and lye enter expansion segment 14, and stretched section 14 enters in the solution recovery tank 15 of lower section.
In solution recovery tank 15, solution is located below, and flue gas is in top.
2), the solution ph for obtaining step 1) is adjusted to 8-11.5, and pH value specific value can be true according to content of beary metal
It is fixed, it can be 8,8.3,9.2,10,10.5,11 or 11.5 etc..Adjustment solution ph may make the heavy metal in solution to turn
Turn to hydroxide precipitating.It after heavy metal is converted into hydroxide precipitating, is handled using 5 filters pressing of filter press, recycles heavy metal hydrogen
Oxide.
3) ozone oxidation, is used in the flue gas input oxidation reaction tower 2 obtained after step 1) processing in container 15,
NO in flue gas is oxidized to high-valence state nitrogen oxides, such as NO2、NO3、N2O4、N2O5Deng.Flue gas input scrubbing tower 7 is made again
It is washed with sig water, store lye in the scrubbing tower 7 in advance or sprays into lye while inputting flue gas, liquid-gas ratio is
1-20L/m3, specific ratio can be 1,1.1,1.8,2.5,11,12.5,13,15,16,18,20L/m3Deng.Lye is Ca
(OH)2、NaOH、KOH、NaHCO3、Na2CO3、K2CO3、KHCO3And/or Ca (HCO3)2Equal solution.Lye is in the present embodiment
NaOH solution.Lye in scrubbing tower 7 absorbs sour gas HCl and SO in flue gas2And NO2、NO3、N2O4、N2O5Deng and will
It is neutralized, and flue gas is discharged；Lye in scrubbing tower 7 absorbs the heavy metal in flue gas and removes particulate matter.After this step process
Flue-gas temperature is down to 60 DEG C or so.
4) pH value of the solution in scrubbing tower 7, is adjusted to 8-11.5, and the solution ph of this step can refer to step 2) tune
It is whole.Adjustment solution ph makes heavy metal be converted into hydroxide precipitating to go forward side by side one-step removal particulate matter.Solution is pressed using filter press 5
Filter processing, recycling hydroxide precipitating.
5) flue gas, being discharged after washed tower 7 enter wet electrical dust precipitator 3 processing, down to 0.5um fine particle,
Water droplet, aerosol etc. are further removed.It is then exhausted from after removing particulate matter.Through treated the flue-gas temperature of wet electrical dust precipitator 3
It is 60 DEG C or so.Through electrostatic precipitator 3, treated that flue gas is delivered in heater 4, is added using the water vapour in step 1-1)
Heat is discharged afterwards to 135 DEG C or more.Achieve the purpose that eliminate white cigarette.
According to method and step described in embodiment 1, the technological parameter for changing each step repeats to implement, and following table is each other realities
Apply the technological parameter in example:
Through experimental tests, the method for various embodiments of the present invention can reach following effect:
The present invention uses wet process chilling, makes flue-gas temperature in 1s by 500 using a large amount of sig waters in quenching process
DEG C 100 DEG C are down to hereinafter, simultaneously to flue gas middle acid substance such as HCl, SO2Etc. being removed, while by the particulate matter in flue gas
It washs to tower bottom.It is as follows that such advantage compares traditional chilling semidry method:
1. avoiding chilling half-dried the problems such as using atomizer and blocking, mechanical wear brought by it in the process；
Since coolant liquid does not need to be atomized in wet process quenching process, blocking can be avoided with bigbore nozzle.
2. reducing the temperature controlled complexity of chilling.High, the mist of penetrating is required for control during chilling is half-dried
Choline liquid measure must constantly be adjusted according to the fluctuation into tower flue gas amount and flue-gas temperature, and system control has certain stagnant
Afterwards, flue-gas temperature cannot reduce control dioxin is not achieved if spraying into alkali hypovolia, can draw if spraying into hypervolia
Play the corrosion of " wet wall " to tower body.And use wet process chilling both can not be by exhaust gas volumn and flue gas temperature under the cooling of a large amount of lye
The fluctuation of degree easily controls exit gas temperature, therefore reduces the temperature controlled complexity of chilling.And avoid tower body
The risk of corrosion reduces system maintenance cost.
3. reducing the dust in flue gas.Since the flue-gas temperature after penetrating lye chilling exists during traditional chilling is half-dried
200 DEG C or so, the salt that lye generates after reacting with sour gas is drifted in flue gas in the form of particulate matter, while dry way process
It is middle to spray into a large amount of powdery Ca (OH)2And active carbon, the particle concentration in such flue gas are greatly improved, and increase subsequent remove
Dirt pressure, and the heavy metal in flue gas cannot be enriched with.And a large amount of sig water can be by flue gas in wet process quenching process
In particulate matter, the salt that generates in heavy metal and water-washing process be disposably washed till tower bottom, substantially reduce in flue gas in this way
Particle concentration, while making heavy metal substance soluble easily in water between 8-11.5 in the pH value of tower bottom adjusting tower bottom coolant liquid
With the form precipitating of hydroxide precipitating, particulate matter and weight not soluble in water in order to heavy metal accumulation, in tower bottom coolant liquid
Metallics etc. forms mud cake after filters pressing, so that recycling heavy metal therein becomes possible.
4. more effectively removal NOx.The present invention joined ozone denitrification apparatus after wet process chilling, by the NO oxygen in flue gas
It is melted into high-order NO soluble easily in water2、NO3、N2O4、N2O5Etc. substance, removed in second level alkali cleaning.Avoid traditional SCR
The disposition of the poisoning and deactivation and dead catalyst of catalyst during low-temperature denitration.
5. more effective thorough depickling.The present invention is using second level alkali cleaning to acidic materials (the HCl, SO2, high-order in flue gas
NOx), heavy metal substance and particulate matter carry out further absorption cleaning.Generating portion is soluble on a small quantity in this water-washing process
The salt of water and heavy metal hydroxide not soluble in water are enriched in tower bottom, the particulate matter and weight not soluble in water in tower bottom coolant liquid
Metallics etc. forms mud cake after filters pressing, so that recycling heavy metal recovery therein becomes possible.Pollution in flue gas simultaneously
Object is further reduced.
6. reducing secondary pollution without solid-state castoff discharge.The flue gas that the present invention comes out from second level caustic wash tower passes through wet type
Electric precipitator, can be to fine particle (water droplet, aerosol etc.) efficient removal in flue gas down to 0.5um, instead of traditional
Bag filter.Therefore it avoids and generates secondary flying ash in the process using bag filter, while also avoiding useless cloth bag disposition
Corrosion of the fluorine element for disposal system in the process reduces resulting secondary pollution.
Flue gas is reduced to disappear white energy consumption.Traditional chilling semidry method also needs the wet tower washing of level-one after bag filter,
The humidity that will increase flue gas during this, subsequent flue gas disappear it is white during need more energy.Wet electrical dust precipitator
98% is up to for the liquid droplet removal rate in flue gas, effectively reduces the humidity of flue gas, therefore reduce subsequent flue gas and add
The energy consumption of heat.
Embodiment in the present invention is only used for that the present invention will be described, and is not construed as limiting the scope of claims limitation,
Other substantially equivalent substitutions that those skilled in that art are contemplated that, are within the scope of the invention.
Claims (14)
1. a kind of novel fume cleaning method, which is characterized in that comprising steps of
1), high-temperature flue gas is mixed with lye, rapid cooling is waved to 100 DEG C hereinafter, the sour gas in flue gas is neutralized by lye
Hair property heavy metal is condensate in lye, and particulate matter is absorbed by lye, flue gas is discharged, and obtain solution；
2), the solution ph for obtaining step 1) is adjusted to 8-11.5, so that the heavy metal in solution is converted into hydroxide and sinks
It forms sediment；
3), the NO in flue gas is oxidized to high-valence state nitrogen oxidation using ozone oxidation by the flue gas obtained after step 1) processing
Object；Flue gas is inputted into scrubbing tower alkali liquid washing again, lye absorbs the sour gas in flue gas and neutralized in scrubbing tower
Lye absorbs the heavy metal and particulate matter in flue gas；Flue gas is discharged；
4) pH value of the solution in scrubbing tower, is adjusted to 8-11.5, and heavy metal is made to be converted into hydroxide precipitating.
2. novel fume cleaning method according to claim 1, which is characterized in that in step 1), liquid-gas ratio 1-20L/
m3。
3. novel fume cleaning method according to claim 1, which is characterized in that the temperature of step 1) high temperature flue gas is
500 DEG C or more.
4. novel fume cleaning method according to claim 1, which is characterized in that before the step 1), further include
Step 1-1), waste heat recycling and denitration process are carried out to flue gas, then enter back into step 1).
5. novel fume cleaning method according to claim 1, which is characterized in that step 2) and step 4) generate solution warp
Filters pressing processing, recycling hydroxide precipitating.
6. novel fume cleaning method according to claim 1, which is characterized in that in the step 3), liquid-gas ratio 1-
20L/m3。
7. novel fume cleaning method according to claim 1, which is characterized in that after the step 4) further include step
5) flue gas, being discharged after washed tower enters wet electrical dust precipitator processing, is then exhausted from after removing particulate matter and water droplet.
8. novel fume cleaning method according to claim 7, which is characterized in that in the step 5), removed through wet type electricity
Dirt device treated flue gas, discharge after being heated to 130 DEG C or more.
9. novel fume cleaning method according to claim 8, which is characterized in that before the step 1), further include
Step 1-1), waste heat recycling and denitration process are carried out to flue gas, then enter back into step 1)；The waste-heat aquatic products of off-gas recovery
Producing water vapor, water vapour are used for heating stepses 5) flue gas obtained.
10. novel fume cleaning method according to claim 1, which is characterized in that the alkali described in the step 1 and 3
Liquid is Ca (OH)2、NaOH、KOH、NaHCO3、Na2CO3、K2CO3、KHCO3And/or Ca (HCO3)2Solution.
11. novel fume cleaning method according to claim 1, which is characterized in that the flue gas is ash melting flue gas.
12. novel fume cleaning method according to claim 1, which is characterized in that the flue gas is rubbish or waste
Burning or the generated flue gas that gasifies.
13. flue gas purifying equipment, which is characterized in that including chilling extracting tower, the chilling depickling tower structure includes from top to bottom
Straightway, contraction section, aditus laryngis section and expansion segment；Bore is unanimous between the higher and lower levels inside the straightway, the upper end be provided with for flue gas into
The opening entered；Contraction section upper end bore is greater than lower end bore, and the ratio between the upper end bore and lower end bore are 1.1-20:1, receives
Contracting section upper end is connected to straightway, and lower end is connected to aditus laryngis section；Aditus laryngis section bore is identical as contraction section lower end bore；Aditus laryngis section is certainly
It is identical up to lower relative aperture；Aditus laryngis section upper end is connected to contraction section lower end, and lower end is connected to expansion segment；Expansion segment upper end bore is under
The ratio between port diameter is 1:1.5-20.
14. flue gas purifying equipment according to claim 13, which is characterized in that the flue gas purifying equipment further includes denitration
And waste heat recovery apparatus, solution recovery tank, oxidation reaction tower, scrubbing tower, wet electrical dust precipitator and heater；Nitre and waste heat recycling
Equipment, chilling extracting tower, solution recovery tank, oxidation reaction tower, scrubbing tower, wet electrical dust precipitator and heater are sequentially communicated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN110404404A (en) * | 2019-05-29 | 2019-11-05 | 张家港市艾尔环保工程有限公司 | A kind of high chlorine incineration flue gas synergistic purification technique of high-sulfur |
| CN115212694A (en) * | 2022-07-22 | 2022-10-21 | 光大环境科技（中国）有限公司 | Method and device for treating fly ash plasma molten flue gas |
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