A kind of processing method and processing unit of sulfur-containing smoke gas
Technical field
The invention belongs to smoke gas treatment technical fields, and in particular to a kind of processing method and processing unit of sulfur-containing smoke gas.
Background technique
Nitrogen oxides (NOx) has N2O、NO、NO2、N2O3、N2O4And N2O5Etc. diversified forms, and a variety of harm can be caused, such as
Photochemical fog can be generated with the volatile organic matter (VOC) in atmosphere, to cause strong impulse to make in eyes, throat
With, and cause headache and respiratory disease etc., serious person will cause death.China's NOx discharge is for years more than 2000
Ten thousand tons, although continuous decreasing trend has been presented since 2012, its pollution situation is still severe.Since two thousand three, I
State SO2Total emission volumn can not have always been high any more yet, China SO in 201421974.4 ten thousand tons of total emission volumn.On September 12nd, 2014, country
Three ministries and commissions such as State Development and Reform Commission, Environmental Protection Department and National Energy Board joint publication " about print and distribute < coal electricity energy-saving and emission-reduction upgrading with
Be transformed action plan (2014-2020) > notice " (hair changes the energy [2014] 2093), it is desirable that it is real to fire coal boiler fume
Row " ultra-clean discharge ", i.e. flue dust, SO210mg/Nm is respectively reached with NOx emission concentration index3、35mg/Nm3And 50mg/
Nm3。
Gas denitrifying technology mainly has at present: the SCR(selective catalytic reduction of gas phase reaction) and SNCR(it is selectively non-
Catalytic reduction method), liquid absorption method, solid absorption method, high energy electron active oxidation method (EBA electron beam irradiation method and PPCP arteries and veins
Rush corona plasma method) etc..In numerous denitrating flue gas processing techniques, liquid absorption method denitration efficiency is low;Absorption method denitration
It is high-efficient, but adsorbance is small, and frequently, application is not extensive for regeneration;High energy electron active oxidation method can be with simultaneous SO_2 and NO removal, but energy
Consumption is high, and the service life is short;The escapement ratio of SNCR method ammonia is high, can generate safety problem.SCR technology has denitration compared with other technologies
It is high-efficient, the advantages that technology maturation, be at present both at home and abroad Flue Gas Denitrification Engineering using most technologies.SCR method, which refers to, is reacting
200-400 DEG C of temperature, use NH3Make reducing agent and NOx catalysis is reduced to N2, the oxygen in exhaust gas seldom participates in reaction, and thermal discharge is small.
But the technology, to the more demanding of catalyst, the development of high performance catalyst is research hotspot.
Common fume desulphurization method mainly includes two kinds of dry and wet, compared with dry desulfurization, wet desulphurization equipment
It is small, it is easy to operate, and desulfuration efficiency is high, application is relatively broad, such as sodium method, magnesium processes, ammonia process and calcium method, wherein with sodium method and calcium
Method is most.Whether wet desulphurization can also useful according to product, is divided into the method for abandoning and absorption method, and absorption method used at present is stone
Lime stone-gypsum, but by-product-gypsum added value is lower, drug on the market, at the same limestone-gypsum method easily cause equipment or
Pipeline scale and blocking, desulfurizer operation is cumbersome, and on-site sanitation situation is also poor.Though in ammonia process of desulfurization energy recovered flue gas
Sulphur ressource, but product ammonium sulfate can make soil hardening, seldom be used alone, and the heavy metal ion in flue gas is also whole
Into in ammonium sulfate product, secondary pollution is caused to soil, and then endanger human health.Sodium method flue gas desulfurization is to abandon
Method, but because absorption efficiency height and absorption rate are fast, to the more demanding area of environmental protection index through frequently with.Sodium method flue gas desulfurization
Concentration of sodium sulfite in waste water is usually about 7.5%-20%, to guarantee that desulfurization wastewater can satisfy emission request, in construction cigarette
When desulfurization device, it is necessary to while building flue gas desulfurization waste-water oxidation treatment device.Since sodium sulfite oxidation rate is slower, lead to
5-8h is often needed, investment, land occupation and operating cost are higher.In addition, having very in the waste water of sodium method flue gas desulfurization device discharge
High salt content, and many places that are emitted on of brine waste are prohibited, therefore, how to realize desulfurization wastewater " zero-emission
Put " and desulfurizing and purifying flue gas qualified discharge double goal become the special concern of people.
Chinese patent CN107349785A is related to a kind of Multifunctional tobacco gas processing system, including sequentially connected by pipeline
SCR denitration unit, flue gas-air heat exchange unit, cloth-sack-type dust removal unit, desulfurizing tower, heating unit and fume extraction unit.It is described de-
Wet electric demisting unit is equipped between sulphur tower and the heating unit, the wet electric demisting unit is handled for removing through the desulfurizing tower
The droplet in flue gas afterwards, and will treated flue gas the is discharged into heating unit, the flue gas in the heating unit with
The hot-air exported from the flue gas-air heat exchange unit is discharged into the fume extraction unit after carrying out heat exchange.The desulfurizing tower is also
Be connected to treatment unit for waste water, the treatment unit for waste water be used to receive the waste water of desulfurizing tower discharge and to the waste water into
Row processing.The invention can effectively remove sulfur dioxide and nitrogen oxides in flue gas, but also can be carried out effectively remaining
Heat utilization and the processing of waste water.But the deficiencies of there are process flow length, complex disposal process, high processing energy consumptions.
Chinese patent CN105381699A is related to a kind of hydrogen peroxide oxidation joint amino wet desulphurization method of denitration and its dress
It sets, obtains the sulfite solution with reproducibility first with efficient removal of the amino acid solution for sulfur dioxide.Secondly, sharp
With nitric oxide of the hydrogen peroxide in the high mars free radical efficient oxidation processed gas that catalyst surface decomposes.Finally,
Sulfite solution is mixed and reacted with nitrogen oxides, to reach the target of efficient absorption nitrogen oxides.The invention is established
The desulphurization denitration mode of liquid phase efficient removal flue gas product and product recycling.But long, treatment process that there are still process flows
The deficiencies of complexity, high processing energy consumption.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of processing method of sulfur-containing smoke gas and processing units.This hair
It is bright that the processing of alkene spent lye is contained into SO with microdisk electrode coupling processing2、CO2、NOXFlue gas, realize the efficient process of flue gas,
Without using catalyst and a large amount of absorbents, have many advantages, such as that removal effect is good, processing cost is low, economic and environment-friendly.
The processing method of sulfur-containing smoke gas provided by the invention, including following content:
(1) flue gas is passed through desulfurization reactor, using alkene spent lye as absorbent, obtains desulfurization waste liquor and desulfurization fume;
(2) causticization regeneration is carried out to desulfurization waste liquor, obtains sediment, through high-temperature calcination, obtained high concentration SO2With step (1)
Desulfurization fume reaction, prepares sulphur;
(3) gas that step (2) generates is passed through in bioreactor for microdisk electrode, collects discharge gas, and the microalgae is
It is resistant to the microalgae of NOx;
(4) step (3) cultivating system is separated by solid-liquid separation, respectively harvesting microalgae cell and filtrate;
(5) sodium peroxide is added in step (4) filtrate, and step (4) discharge gas is passed through in filtrate and is reacted, obtains net
Change gas;
(6) step (5) Filtrate carries out denitrification processing.
In the present invention, step (1) sulfur-containing smoke gas is containing NOx, SO2、CO2Flue gas, NOx is mainly NO and/or NO2,
Such as can from coal-fired flue-gas, sulfur recovery facility incineration tail gas, any one in catalytic cracked regenerated tail gas flue gas or
Several mixing.
In the present invention, step (1) desulfurization reactor is reactor commonly used in the art, such as can be desulfurization suction
Receive tower.Alkene spent lye is mainly ethylene waste lye, propylene spent lye etc., wherein containing a large amount of free alkali, vulcanized sodium, carbonic acid
Sodium, organic matter etc. can such as derive from petrochemical industry preparing propylene by dehydrogenating propane, the salkali waste generated during ethane dehydrogenation to ethene
Liquid.In absorption process, the pH value for controlling absorbing liquid is 4.5~7, preferably 5~6.5.In the desulfurization fume of generation, mainly contain
H2S、CO2, the pollutants such as NOx, VOCs, SO2Removal efficiency is greater than 95%.
In the present invention, the regeneration of step (2) causticization uses lime, such as can be white lime, quick lime, in lime stone at least
One kind, preferably white lime.Obtained sediment is mainly CaSO3, by high-temperature calcination, obtain CaO and high concentration SO2, CaO can
To be back to use causticization regenerative process.High concentration SO2With the H in step (1) desulfurization fume2S is reacted, and sulphur is prepared.Regenerating alkali
The sewage that liquid can be used for sewage farm is adjusted.
In the present invention, step (3) microdisk electrode is according to NOx, CO in flue gas2Multistage optical-biological reaction can be set in content
Device controls CO in every grade of bioreactor2Content is lower than 45v%, preferably 5v%~35v%;NOx content is lower than 0.1v%, excellent
Choosing is lower than 0.06v%;Ventilatory capacity is 0.1~1.0vvm.
In the present invention, step (3) accesses micro-algae culture medium and microalgae seed liquor, micro-algae culture medium in bioreactor
Using the fluid nutrient medium of the culture microalgae such as BG11, SE, BBM well known in the art.Micro-algae culture medium and microalgae seed liquor
Preparation with ability conventional method, the inoculum concentration of microalgae seed liquor is the 1%~50% of culture volume, preferably 5%~30%.
In the present invention, the microalgae of step (3) the tolerance NOx is the published any microalgae for being resistant to NOx, is preferably adopted
With algae fibre (Ankistrodesmus sp.) SS-B7, the algae strain be preserved in China Microbiological bacterium on April 15th, 2013
Kind preservation administration committee common micro-organisms center, deposit number are CGMCC No. 7478, and preservation address is Beijing's southern exposure
No. 3 Institute of Microorganism, Academia Sinica, institute of area North Star West Road 1.Algae strain discloses in CN 105713836A, and mentions
Preservation and survival has been handed over to prove.The algae fibre SS-B7 seed liquor of access and the volume ratio of micro-algae culture medium are 1:20~1:5.
Further, at the same be added appropriate chlorella (Chlorella sp.) SF-B1, the chlorella (Chlorella sp.) SF-B1 is preserved in China Committee for Culture Collection of Microorganisms's common micro-organisms center on July 6th, 2015,
Deposit number is CGMCC No. 11005, and preservation address is that the Yard 1, BeiChen xi Road, Chaoyang District, Beijing City 3 Chinese Academy of Sciences is micro-
Biological study institute.When accessing chlorella SF-B1, the volume ratio of algae fibre SS-B7 and chlorella SF-B1 seed liquor be 1:1~
50:1。
In the present invention, the algae fibre SS-B7, chlorella SF-B1 seed liquor the preparation method is as follows: by micro-algae culture medium
PH be adjusted to 6~9, be 20~30 DEG C in temperature, periodicity of illumination is that for 24 hours, brightness time ratio is 14:10~10:14, and illumination is strong
Degree is 2000~10000Lux, shaken cultivation to logarithmic growth phase.
In the present invention, the condition of step (3) described microdisk electrode are as follows: 10~35 DEG C of temperature, periodicity of illumination for 24 hours, when brightness
Between than 10:14~14:10, pH value 6~9,2000~20000Lux of intensity of illumination, culture to growth stationary phase terminates.
In the present invention, step (4) is separated by solid-liquid separation using modes such as centrifugation, filterings, and harvesting microalgae cell and filtrate, survey respectively
Determine dry cell weight and fat content, dry cell weight can reach 40% of dry cell weight or more up to 10g/L or more, fat content.
In the present invention, a certain amount of sodium peroxide is added in step (5) in filtrate, with specific reference to the residue in discharge gas
NOx content determines, it is made to be converted into nitrite, and the amount of being preferably added to is 1~30g/L.In obtained purified gas, CO2Removal efficiency
Up to 65% or more, NOx removal rate is up to 80% or more.
In the present invention, step (5) obtains being mainly nitrite, nitrate in filtrate, and access denitrifying bacterium carries out anti-nitre
Change processing, the sludge concentration after inoculation are 2000~10000mg/L.The removal efficiency of total nitrogen reaches 90% or more in water outlet.
The present invention also provides a kind of for the above-mentioned processing unit containing flue gas processing method, including desulphurization system, causticization are again
Raw system, calcination system, sulfur recovery system, optical-biological reaction system, solid-liquid separation system, oxidative system, denilrification system,
Middle desulphurization system mainly includes desulfuration absorbing tower, for alkene spent lye and sulfur-containing smoke gas contact removing SO2And it is useless to obtain desulfurization
Liquid and desulfurization fume;Causticization of the causticization regenerative system for desulfurization waste liquor regenerates, and obtains CaSO3Sediment and regeneration lye;It forges
Burning system is used for CaSO3Sediment calcining is high concentration SO2And CaO;Sulfur recovery system is used for high concentration SO2With desulfurization fume
Reaction, prepares sulphur;Optical-biological reaction system mainly includes several grades of bioreactors, using the sulfur recovery tail gas being passed through into
Row microdisk electrode collects discharge gas;For microdisk electrode system to be separated by solid-liquid separation, harvesting microalgae cell obtains solid-liquid separation system
To filtrate;Oxidative system is used to that sodium peroxide to be added in filtrate and is passed through discharge gas, is purified gas;Denilrification system is used for
Denitrification processing is carried out to the filtrate that oxidation obtains.
Compared with prior art, the invention has the following advantages that
(1) processing of alkene spent lye and the processing of microdisk electrode PROCESS COUPLING are contained SO by the present invention2、CO2、NOXFlue gas, realize
The efficient process of flue gas, without using catalyst and a large amount of absorbents, with removal effect is good, processing cost is low, economic and environment-friendly
The advantages that.
(2), not only can be with high-efficiency desulfurization using alkene spent lye as desulfurization absorbent, but also can recycle useless with reuse
Utility in lye and flue gas, the treatment of wastes with processes of wastes against one another, environmental benefit and remarkable in economical benefits are promoted.
(3) using tolerance NOXMicroalgae handle flue gas, flue gas and spent lye acidification generate tolerable high concentration CO2And
Generate O2, make NOXNO is formed in water3 -And NO2 -, N is then converted in denitrification process2, above process synergistic effect, in fact
Existing CO2And NOXEfficient removal.
(4) algae fibre SS-B7 is used, NO is resistant toXPerformance is good, and carbon sequestration is high-efficient, the frustule of available high yield.It adopts
With chlorella (Chlorella sp.) SF-B1, NOXRemoval effect it is more preferable, reduce sodium peroxide dosage.
(5) present invention can contain SO with the processing of environmental protection and economy2、NOX、CO2Flue gas, and available high fat content
Microalgae cell, economic benefit and environmental benefit are obviously improved.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of fume treatment of the present invention;
Wherein, 1- desulphurization system, 2- causticization regenerative system, 3-CaSO3Calcination system, 4- sulfur recovery system, 5- optical-biological reaction
System, 6- solid-liquid separation system, 7- oxidative system, 8- denilrification system;
101- flue gas, 102- desulfurization fume, 103- sulfur recovery tail gas, 104- discharge gas, 105- purified gas, 106- nitrogen;201-
Alkene spent lye, 202- desulfurization waste liquor, 203- regenerate lye;301- lime, 302-CaSO3Sediment, 303- quick lime;401-
SO2, 402- sulphur;501- microalgae cell, 502- filtrate;601- sodium peroxide.
Specific embodiment
Below by embodiment, invention is further described in detail.Embodiment is based on the technical solution of the present invention
Under implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention be not limited to it is following
Embodiment.In the present invention, v% is volume fraction.
Experimental method in following embodiment is unless otherwise specified conventional method in that art.Institute in following embodiments
Experimental material is commercially available from routine biochemistry reagent shop unless otherwise specified.
Flue gas processing device of the invention is as shown in Fig. 1, including desulphurization system 1, causticization regenerative system 2, CaSO3Calcining
System 3, sulfur recovery system 4, optical-biological reaction system 5, solid-liquid separation system 6, oxidative system 7, denilrification system 8, wherein taking off
Sulphur system 1 mainly includes desulfuration absorbing tower, and flue gas 101 is passed through Ta Nei and contacts removing SO with alkene spent lye 2012And it is taken off
Sulphur flue gas 102 and desulfurization waste liquor 202;Lime 301 is added in causticization regenerative system 2, causticization is carried out again to desulfurization waste liquor 202
It is raw, obtain CaSO3Sediment 302 and regeneration lye 203;By CaSO3Sediment is calcined in calcination system 3 as high concentration SO2
401 and quick lime 303;High concentration SO2It is reacted in sulfur recovery system 4 with desulfurization fume, prepares sulphur 402;Sulfur recovery system
The sulfur recovery tail gas 103 of generation enters optical-biological reaction system 5 and carries out microdisk electrode, collects discharge gas 104;By microdisk electrode body
It ties up in solid-liquid separation system 6 and is separated, obtain microalgae cell 501 and filtrate 502;By sodium peroxide in oxidative system 7
601 are added in filtrate 501, are passed through discharge gas 104 and are reacted, are purified gas 105;Obtained filtrate is aoxidized in denitrification system
Denitrification processing is carried out in system 8.
Removal efficiency of the present invention is (be passed through Gas content-discharge Gas content)/it is passed through Gas content.
Microdisk electrode of the present invention uses BG11 culture medium, is formulated as shown in table 1, table 2.
1 BG11 culture medium of table
* in 2 table 1 of table A5+Co solution composition
BG11 fluid nutrient medium is prepared first, in accordance with Tables 1 and 2, pH is adjusted to 8.0, then by algae fibre SS-B7, chlorella
SF-B1 is inoculated in micro-algae culture medium, cultivates in constant temperature illumination shaking table, and cultivation temperature is 25 DEG C, and periodicity of illumination is brightness for 24 hours
Time ratio is 14:10, and intensity of illumination 5000Lux, 120rpm shaken cultivation to logarithmic growth phase obtains algae fibre SS-B7, small
Ball algae SF-B1 seed liquor.
The denitrification sludge that the embodiment of the present invention uses is derived from the denitrification processing pond in certain sewage farm, is discharged total nitrogen
Removal efficiency is up to 90% or more.Total nitrogen concentration is discharged using GB11894-89 " water quality-total nitrogen measurement-alkaline chitinase resolution
Ultraviolet spectrophotometry " detection.
The flue gas that the present invention uses is containing NOx, SO2、CO2Flue gas, NOx is mainly NO and/or NO2.Pollutant in flue gas
Content is detected using flue gas analyzer.
Embodiment 1
The spent lye that certain enterprise's ethylene unit generates, wherein COD is 58000mg/L, and vulcanization na concn is 2.9wt% (S2-:
12200mg/L), concentration of sodium carbonate 2.0wt%(20500mg/L), naoh concentration 1.6wt%.
The flue gas that certain enterprise generates mainly forms are as follows: CO2Content is 14v%, and NOx content is that wherein NO is accounted for 0.06v%(
90%), SO2Content is 0.04v%.
Flue gas is passed through desulfuration absorbing tower, using ethylene waste lye as absorbent, the cyclic absorption in desulfurizing tower, control
The pH of absorbing liquid is 5-6, when pH is lower than 5, partial desulfurization absorbing liquid outlet starts to supplement spent lye, when pH reaches 6,
Stopping is added, and desulfurization fume is obtained.In the desulfurization absorbing liquid of outlet mainly based on sodium hydrogensulfite, white lime is added to desulfurization
Waste liquid carries out causticization regeneration, obtains CaSO3Sediment obtains high concentration SO through high-temperature calcination2And quick lime, quick lime are back to use
Causticization regenerative process.High concentration SO2With H in step (1) desulfurization fume2S reaction, makes SO2And H2The molar ratio of S is 1:2, in aluminium
Under the action of base catalyst, SO2And H2S reacts to obtain sulphur.In the tail gas that sulfur recovery system obtains, CO2Content is 16v%, NOx
Content is about 0.05v%.
Above-mentioned sulfur recovery tail gas is passed through in bioreactor and is used for microdisk electrode, ventilatory capacity 0.5vvm.In photoproduction
In object reactor, the algae fibre SS-B7 seed liquor that 6L micro-algae culture medium and 1.0L are prepared is added, the intensity of illumination of culture is
5000Lux, cultivation temperature are 25 DEG C, and periodicity of illumination is that for 24 hours, brightness time ratio is 14:10.In the discharge gas of collection, CO2Removing
Rate is 70%, and NOx removal rate is 36%.
After culture 8 days, microalgae cell and filtrate is harvested by centrifugation.Measure dry cell weight and fat content.Under the conditions of -60 DEG C
Algae dried bean noodles weight is measured after vacuum freeze drying to constant weight, calculate yield of biomass, and use n-hexane: ethyl acetate method measures always
Rouge content.Dry cell weight can reach 11.2g/L after detecting, and fat content is the 41.7% of dry cell weight.
Sodium peroxide is added in filtrate, the discharge gas of collection is passed through in filtrate and handles by additional amount 6.5g/L,
It is purified gas.In purified gas, CO2Removal efficiency is 75%, and NOx removal rate is 80%.Filtrate accesses denitrification sludge after reaction, dirty
Mud concentration is 5000mg/L, and total nitrogen removal efficiency is up to 90% or more in water outlet.
Embodiment 2
The spent lye that certain enterprise's ethylene unit generates, wherein COD is 33000mg/L, and vulcanization na concn is 2.1wt% (S2-:
8831mg/l), concentration of sodium carbonate 1.1wt%(11275mg/L), naoh concentration 1.2wt%.
The flue gas that certain enterprise generates mainly forms are as follows: CO2Content is 10v%, NOx content 0.04v%, SO2Content is
0.03v%。
Flue gas is passed through desulfuration absorbing tower, using ethylene waste lye as absorbent, the cyclic absorption in desulfurizing tower, control
The pH of absorbing liquid is 5.5-6.5, when pH is lower than 5.5, by partial desulfurization absorbing liquid outlet, starts make-up ethylene spent lye, when
When pH reaches 6.5, stops adding, obtain desulfurization fume.In the desulfurization absorbing liquid of outlet mainly based on sodium hydrogensulfite, it is added
White lime carries out causticization regeneration to desulfurization waste liquor, obtains CaSO3Sediment, through high-temperature calcination, obtained high concentration SO2With raw stone
Ash, quick lime are back to use causticization regenerative process.High concentration SO2With H in step (1) desulfurization fume2S reaction, makes SO2And H2S's rubs
You are than being 1:2, under the action of aluminium-based catalyst, SO2And H2S reacts to obtain sulphur.In the tail gas that sulfur recovery system obtains, CO2
Content is 11v%, NOx content 0.03v%.
Above-mentioned sulfur recovery tail gas is passed through in bioreactor and is used for microdisk electrode, ventilatory capacity 0.5vvm.In photoproduction
In object reactor, the algae fibre SS-B7 seed liquor that 6L micro-algae culture medium and 0.9L are prepared is added, the intensity of illumination of culture is
5000Lux, cultivation temperature are 25 DEG C, and periodicity of illumination is that for 24 hours, brightness time ratio is 14:10.In the discharge gas of collection, CO2Removing
Rate is 75%, and NOx removal rate is 40%.
After culture 7 days, microalgae cell and filtrate is harvested by centrifugation.Measure dry cell weight and fat content.Under the conditions of -60 DEG C
Algae dried bean noodles weight is measured after vacuum freeze drying to constant weight, calculate yield of biomass, and use n-hexane: ethyl acetate method measures always
Rouge content.Dry cell weight can reach 11.3g/L after detecting, and fat content is the 43.1% of dry cell weight.
Sodium peroxide is added in filtrate, the discharge gas of collection is passed through in filtrate and handles by additional amount 3.2g/L,
It is purified gas.In purified gas, CO2Removal efficiency is 80%, and NOx removal rate is 85%.Filtrate accesses denitrification sludge after reaction, dirty
Mud concentration is 5000mg/L, and total nitrogen removal efficiency is up to 90% or more in water outlet.
Embodiment 3
Certain enterprise's dehydrogenating propane alkene generate spent lye, wherein vulcanized sodium be 6.83wt%, NaHS 4.85wt%,
COD is 117300mg/L, pH 13.5.
The flue gas that certain enterprise generates mainly forms are as follows: CO2Content is 20v%, NOx content 0.05v%, SO2Content is
0.02v%。
Flue gas is passed through desulfuration absorbing tower, using propylene spent lye as absorbent, the cyclic absorption in desulfurizing tower, control
The pH of absorbing liquid is 5-6, when pH is lower than 5, partial desulfurization absorbing liquid outlet starts to supplement propylene spent lye, when pH reaches 6
When, stop adding, obtains desulfurization fume.In the desulfurization absorbing liquid of outlet mainly based on sodium hydrogensulfite, white lime pair is added
Desulfurization waste liquor carries out causticization regeneration, obtains CaSO3Sediment, through high-temperature calcination, obtained high concentration SO2And quick lime, quick lime
It is back to use causticization regenerative process.High concentration SO2With H in step (1) desulfurization fume2S reaction, makes SO2And H2The molar ratio of S is 1:
2, under the action of aluminium-based catalyst, SO2And H2S reacts to obtain sulphur.In the tail gas that sulfur recovery system obtains, CO2Content is
22v%, NOx content 0.04v%.
Sulfur recovery tail gas is passed through in bioreactor and is used for microdisk electrode, ventilatory capacity 0.3vvm.It is anti-in photo-biological
It answers in device, the algae fibre SS-B7 seed liquor that 6L micro-algae culture medium and 1.2L are prepared is added, the intensity of illumination of culture is
5000Lux, cultivation temperature are 25 DEG C, and periodicity of illumination is that for 24 hours, brightness time ratio is 14:10.In the discharge gas of collection, CO2Removing
Rate is 63%, and NOx removal rate is 39%.
After culture 8 days, microalgae cell and filtrate is harvested by centrifugation.Measure dry cell weight and fat content.Under the conditions of -60 DEG C
Algae dried bean noodles weight is measured after vacuum freeze drying to constant weight, calculate yield of biomass, and use n-hexane: ethyl acetate method measures always
Rouge content.Dry cell weight can reach 10.5g/L after detecting, and fat content is the 41.4% of dry cell weight.
Sodium peroxide is added in filtrate, the discharge gas of collection is passed through in filtrate and handles by additional amount 3.1g/L,
It is purified gas.In purified gas, CO2Removal efficiency is 68%, and NOx removal rate is 80%.Filtrate accesses denitrification sludge after reaction, dirty
Mud concentration is 5000mg/L, and total nitrogen removal efficiency is up to 90% or more in water outlet.
Embodiment 4
Using incubation and condition of culture same as Example 1, the difference is that: chlorella is added simultaneously in microdisk electrode
SF-B1, inoculum concentration is constant, and the volume ratio of chlorella SF-B1 seed liquor and algae fibre SS-B7 seed liquor is 1:1.The discharge of collection
CO in gas2Removal efficiency is 75%, and NOx removal rate is 70%.The additional amount of sodium peroxide reduces nearly half, in obtained purified gas,
CO2Removal efficiency is 85%, and NOx removal rate is 90%.After processing in water outlet nitrogen removal rate up to 90% or more.
Embodiment 5
Using incubation and condition of culture same as Example 1, the difference is that: chlorella is added simultaneously in microdisk electrode
SF-B1, inoculum concentration is constant, and the volume ratio of chlorella SF-B1 seed liquor and algae fibre SS-B7 seed liquor is 1:5.The discharge of collection
CO in gas2Removal efficiency is 75%, and NOx removal rate is 60%.The additional amount of sodium peroxide reduces nearly one third, obtained purified gas
In, CO2Removal efficiency is that 82%, NO removal efficiency is 86%.After processing in water outlet nitrogen removal rate up to 90% or more.
Comparative example 1
Using incubation and condition of culture same as Example 1, the difference is that: the pH for controlling absorbing liquid is 3-4.By
It is too low in pH, the normal operating of sulfur recovery system is influenced, makes the presence of excess SO in sulfur recovery tail gas2Or H2S, and then influence micro-
The normal operation of algae culture.
Comparative example 2
Using incubation and condition of culture same as Example 1, the difference is that: sodium peroxide is not added.Purified gas
In, the removal efficiency of NOx is 40% or so.
Comparative example 3
Using incubation and condition of culture same as Example 1, the difference is that: using described in CN102311921A
Chlorella FY1#, due to not tolerating NOX, therefore mortality after a period of time is grown, subsequent process can not be carried out.
In summary, the processing of alkene spent lye and the processing of microdisk electrode PROCESS COUPLING are contained SO by the present invention2、CO2、NOXCigarette
Gas realizes the efficient process of flue gas, without using catalyst and a large amount of absorbents, have removal effect is good, processing cost is low,
The advantages that economic and environment-friendly., not only can be with high-efficiency desulfurization using alkene spent lye as desulfurization absorbent, but also can recycle and return
With the utility in spent lye and flue gas, the treatment of wastes with processes of wastes against one another.Available microalgae grease simultaneously, economic benefit and environmental benefit are aobvious
It writes and improves.