CN109621695A - Tail gas treatment process during production of corn starch - Google Patents
Tail gas treatment process during production of corn starch Download PDFInfo
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- CN109621695A CN109621695A CN201811200176.6A CN201811200176A CN109621695A CN 109621695 A CN109621695 A CN 109621695A CN 201811200176 A CN201811200176 A CN 201811200176A CN 109621695 A CN109621695 A CN 109621695A
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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
- B01D53/84—Biological processes
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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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention belongs to environmental technology fields, disclose the tail gas treatment process during production of corn starch, it includes the following steps: that tail gas is carried out spray process by spray column first, temperature is down to 35 DEG C or less, subsequently into pulse bag type dust collector, smoke abatement is removed, then from bottom to top enters desulfurization and denitrification reaction device and carries out desulphurization denitration processing, after being disposed, gas is discharged from desulfurization and denitrification reaction device upper outlet；Biologic packing material layer is provided in the reactor.Present invention process simplifies the prior art, and the tail gas generated in production of corn starch has been effectively treated.
Description
Technical field
The invention belongs to environmental technology fields, specifically, the tail gas treatment process during being related to production of corn starch.
Background technique
Need to use more heat supply during production of corn starch, and boiler fired coal is main source.Boiler
The main reason for tail gas is the mixture of gas and flue dust, is pollution atmosphere.The ingredient of gas is very complicated, includes vulcanization in gas
Object, carbon compound and oxynitrides etc., flue dust include the ash content of fuel, coal grain, oil droplet and high-temperature split product etc..Cause
This flue gas is the combined pollution of a variety of poisonous substances to the pollution of environment.Flue dust is related to the harmfulness of human body and the size of particle, right
It is floating dust of the diameter less than 10 microns that human body, which generates the mostly of harm, especially maximum with 1-2.5 microns of floating dust harmfulness.Flue dust
Close to the pollution and Meteorological Conditions of air, wind, atmospheric stability, turbulent flow etc. and the state of air pollution are in close relations, this
Outer photochemistry, biochemistry also have certain influence to the pollution of flue gas.On the one hand polluter is depended on to the harm of human body
On the other hand composition, concentration, duration and site of action depend on the sensibility of human body.Flue gas concentration height is can to cause urgency
Property poisoning, show as cough, pharyngalgia, asthma uncomfortable in chest, headache, eyes stung etc., serious person can death.In most commonly chronic
Poison causes that respiratory mucosa is stimulated to lead to chronic bronchitis etc..
Desulphurization of fuels denitration technology has been used in each stage of fuel combustion process, such as the preceding desulphurization denitration that burns,
Desulphurization denitration and desulphurization denitration after burning in burning.Desulphurization denitration, i.e. flue gas desulfurization and denitrification after presently mainly burning.Desulfurization skill
Art can be divided into Wet Flue Gas Desulfurization Technique, semi-dry desulphurization technology and three kinds of desulfurization by dry method according to the dry and wet state of desulfurization product.
Gypsum Wet is China's main sulfur removal technology used by coal unit at this stage, but the utilization rate of desulfurized gypsum
Also very low, water consumption is huge, and product is most of still based on accumulation storage after desulfurization, it has also become the after thermal power plant's flyash
Two big solid waste.Above-mentioned sulfur method effect is obvious, but denitration effect is general, currently, denitration has begun using micro- life
Object method, such as the patent of invention " a kind of for purifying the biochemical method of amino acids production flue gas " before applicant, using multiple
It closes microorganism and carrier is prepared into biologic packing material layer and carries out desulphurization denitration processing, high treating effect, and service life to tail gas
It is long, but microbe species are more, and five kinds of microorganisms is needed to be cultivated, mixed, the process is more complicated, is not easy as general enterprises
It is grasped.
Summary of the invention
In order to overcome the drawbacks of the prior art, the object of the present invention is to provide the tail gas during production of corn starch
Treatment process, the simple process is feasible, and tail gas can be effectively treated.
The present invention is achieved by the following technical solution:
Tail gas treatment process during production of corn starch comprising following steps:
Tail gas is subjected to spray process by spray column first, temperature is down to 35 DEG C hereinafter, subsequently into pulse bag type dust collector,
Smoke abatement is removed, then from bottom to top enters desulfurization and denitrification reaction device and carries out desulphurization denitration processing, it is anti-from desulphurization denitration after being disposed
Answer device upper outlet that gas is discharged；Biologic packing material layer is provided in the reactor.
Further,
The biologic packing material layer is prepared in accordance with the following steps: step 1) prepares composite bacteria liquid, and step 2 preparation is modified concave-convex
Stick soil, step 3) prepare microballoon, and step 4) prepares biologic packing material layer.
Further,
The biologic packing material layer is prepared in accordance with the following steps:
Step 1) prepares composite bacteria liquid: Acidithiobacillus ferrooxidans strain GF, Paracoccus denitrificans and Nitrobacter winogradskyi are pressed respectively
More solito culture obtains 1 × 108Then the seed liquor of cfu/ml is mixed to get hybrid according to the volume ratio of 3-5:2-3:2-3
Sub- liquid is gone in fermentation medium according still further to 8% inoculum concentration, and 30 DEG C of cultures for 24 hours, obtain composite bacteria liquid；
Step 2 prepares attapulgite modified: the hydrochloric acid that the mass fraction that 2-3 times of weight is added into attapulgite is 10% is molten
Liquid, sonic oscillation 30min, then the dodecyl sodium sulfate for accounting for attapulgite 1-2% parts by weight is added, continue sonic oscillation
30min is then centrifuged for collecting precipitating, obtain attapulgite modified；
Step 3) prepares microballoon: by attapulgite modified, sodium alginate, sodium bicarbonate and water according to 10-20:5-9:3-5:
The mass ratio of 100-200 is uniformly mixed, and the concentration that same volume is then added dropwise is the calcium chloride water of 20-30g/L, and side is added dropwise
Side concussion after being added dropwise, stands 6-9h, collects precipitating, and the microballoon that diameter is 1-2mm is made；
Step 4) prepares biologic packing material layer: microballoon and composite bacteria liquid mixed according to the ratio of 1-2kg:2-3L, stand 30min,
Then low temperature drying is carried out, drying temperature is 20 DEG C, and water content is 10wt% after drying, and biologic packing material layer is made.
Preferably,
The formula of the fermentation medium is by mass percentage are as follows: molasses 2%, corn flour 1%, urea 0.5%, potassium dihydrogen phosphate
0.5%, epsom salt 0.05%, ferrous sulfate heptahydrate 0.01%, manganese sulfate monohydrate 0.01%, surplus are water, pH7.0.
Above-mentioned is preferred embodiment of the invention.As less preferred technical solution, the present invention is to bacterial strain in seed liquor
Quantity is also not particularly limited, and can be needed according to the environment to determine.
Strain of the present invention belongs to known bacterial strain, can be commercially available from commercial channels.Each strain of the invention
Seed liquor preparation according to the routine culture mode of this field, be not innovative point of the present invention, be not described in detail herein.Used in the present invention
Raw material or reagent in addition to special instruction, it is commercially available.
Compared with prior art, the beneficial effect that the present invention obtains mainly includes but is not limited to following side
Face:
The present invention only passes through the composite bacteria liquid and microballoon mixing of three kinds of bacterial strain preparations, is prepared into biologic packing material, simplifies bacterial strain training
Technique is supported, and is combined by chemicals and microbial technique, has effectively purified tail gas, and it is sharp again to realize waste
With energy conservation and environmental protection；
Between three kinds of bacterial strains of the invention can symbiosis proliferation, compatibility is reasonable, mutually cooperates with, and can reach preferable desulphurization denitration effect
Fruit；
The present invention, with long chain cation instead of the cation between attapulgite, is made by acidification and surfactant processing
Interlamellar spacing becomes larger, while adsorption part inorganic cation is conducive to so that hydrophobicity improves to sulfide and nitridation
The absorption of object；
The pore structure size reasonable of microballoon of the present invention, is evenly distributed, and can guarantee the quantity of pore structure, is conducive to the suction of microorganism
It is attached, improve the adhesion amount and adsorption efficiency of microorganism.
Detailed description of the invention
Fig. 1: removal rate of the different disposal group to each pollutant of tail gas.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, having below in conjunction with the application
The technical solution of the application is clearly and completely described in body embodiment, it is clear that described embodiment is only this Shen
Please a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, should fall within the scope of the present invention.
Embodiment 1
Tail gas treatment process during production of corn starch comprising following steps:
Tail gas is subjected to spray process by spray column first, temperature is down to 35 DEG C hereinafter, subsequently into pulse bag type dust collector,
Smoke abatement is removed, then from bottom to top enters desulfurization and denitrification reaction device and carries out desulphurization denitration processing, it is anti-from desulphurization denitration after being disposed
Answer device upper outlet that gas is discharged；Biologic packing material layer is provided in the reactor.
The biologic packing material layer is prepared according to following technique:
1) by Acidithiobacillus ferrooxidans strain GF ATCC 23270, Paracoccus denitrificans ATCC13543 and Nitrobacter winogradskyi
ATCC14123 obtains 1 × 10 according to routine culture respectively8Then the seed liquor of cfu/ml is mixed according to the volume ratio of 3:2:2
It to seed mixture liquid, is gone in fermentation medium according still further to 8% inoculum concentration, 30 DEG C of cultures for 24 hours, obtain composite bacteria liquid；The hair
The formula of ferment culture medium is by mass percentage are as follows: molasses 2%, corn flour 1%, urea 0.5%, potassium dihydrogen phosphate 0.5%, seven water
Magnesium sulfate 0.05%, ferrous sulfate heptahydrate 0.01%, manganese sulfate monohydrate 0.01%, surplus are water, pH7.0；
2) hydrochloric acid solution that the mass fraction of 2 times of weight is 10%, sonic oscillation 30min are added into attapulgite, then adds and accounts for
The dodecyl sodium sulfate of 1% parts by weight of attapulgite continues sonic oscillation 30min, is then centrifuged for collecting precipitating, is modified
Attapulgite；
3) attapulgite modified, sodium alginate, sodium bicarbonate and water are uniformly mixed according to the mass ratio of 10:5:3:100, so
The concentration that same volume is added dropwise afterwards is the calcium chloride water of 20g/L, is shaken when being added dropwise, and after being added dropwise, stands 6h, collects
The microballoon that diameter is 1mm is made in precipitating；
4) microballoon and composite bacteria liquid are mixed according to the ratio of 1kg:2L, stands 30min, then carry out low temperature drying, dry temperature
Degree is 20 DEG C, and water content is 10wt% after drying, and biologic packing material layer is made.
Embodiment 2
Tail gas treatment process during production of corn starch comprising following steps:
Tail gas is subjected to spray process by spray column first, temperature is down to 35 DEG C hereinafter, subsequently into pulse bag type dust collector,
Smoke abatement is removed, then from bottom to top enters desulfurization and denitrification reaction device and carries out desulphurization denitration processing, it is anti-from desulphurization denitration after being disposed
Answer device upper outlet that gas is discharged；Biologic packing material layer is provided in the reactor.
The biologic packing material layer is prepared according to following technique:
1) by Acidithiobacillus ferrooxidans strain GF ATCC 23270, Paracoccus denitrificans ATCC13543 and Nitrobacter winogradskyi
ATCC14123 obtains 1 × 10 according to routine culture respectively8Then the seed liquor of cfu/ml is mixed according to the volume ratio of 5:3:3
It to seed mixture liquid, is gone in fermentation medium according still further to 8% inoculum concentration, 30 DEG C of cultures for 24 hours, obtain composite bacteria liquid；The hair
The formula of ferment culture medium is by mass percentage are as follows: molasses 2%, corn flour 1%, urea 0.5%, potassium dihydrogen phosphate 0.5%, seven water
Magnesium sulfate 0.05%, ferrous sulfate heptahydrate 0.01%, manganese sulfate monohydrate 0.01%, surplus are water, pH7.0；
2) hydrochloric acid solution that the mass fraction of 3 times of weight is 10%, sonic oscillation 30min are added into attapulgite, then adds and accounts for
The dodecyl sodium sulfate of 2% parts by weight of attapulgite continues sonic oscillation 30min, is then centrifuged for collecting precipitating, is modified
Attapulgite；
3) attapulgite modified, sodium alginate, sodium bicarbonate and water are uniformly mixed according to the mass ratio of 20:9:5:200, so
The concentration that same volume is added dropwise afterwards is the calcium chloride water of 30g/L, is shaken when being added dropwise, and after being added dropwise, stands 9h, collects
The microballoon that diameter is 2mm is made in precipitating；
4) microballoon and composite bacteria liquid are mixed according to the ratio of 2kg:3L, stands 30min, then carry out low temperature drying, dry temperature
Degree is 20 DEG C, and water content is 10wt% after drying, and biologic packing material layer is made.
Embodiment 3
The biologic packing material of Example 1 is placed in bubbling bed reactor, and temperature of reactor is controlled at 30 ± 2 DEG C, into reactor
It is passed through SO2 and NO gas to be absorbed, gas is 5-10s in the residence time of the adsorbent；Reach adsorption equilibrium within 15 minutes,
Sulfur capacity S (g)/adsorbent (g) is 0.35, and it is 0.076 that nitre, which holds N (g)/adsorbent (g),.
Embodiment 4
Tail gas composition before into reactor are as follows: oxygen 11%, sulfur dioxide 936mg/m3, nitrogen oxides 1089mg/m3, cigarette
Dirt 94mg/m3；Flue gas flow rate into reactor is 15L/min.
Control group is set:
Control group 1: only with microballoon as packing layer, not adding composite bacteria liquid, remaining is the same as embodiment 1；
Control group 2: using conventional acticarbon as packing layer；
Control group 3: only with two kinds of bacterial strains of Acidithiobacillus ferrooxidans strain GF and Paracoccus denitrificans, remaining is the same as embodiment 1；
Control group 4: only with acidophilus ferrous oxide sulphur bar and Nitrobacter winogradskyi, remaining is the same as embodiment 1；
Control group 5: only with Paracoccus denitrificans and Nitrobacter winogradskyi, remaining is the same as embodiment 1；
Experimental group is embodiment 1.
Reactor air speed is 5000h-1, the removal rate of each Pollutant Composition of tail gas is measured, as shown in Figure 1, with only
Control group 1 using microballoon as filler is compared, and the removal rate of experimental group sulfur dioxide, nitrogen oxides and flue dust is mentioned
It is high, wherein the promotion amplitude of the removal rate of flue dust is minimum, illustrates that microballoon plays an important role to the absorption of flue dust, and dioxy
Change sulphur, the removal rate promotion of nitrogen oxides are obvious, illustrate that composite bacteria liquid is affected to the removal of sulfur dioxide, nitrogen oxides；
Compared with conventional active carbon, the removal rate of experimental group sulfur dioxide, nitrogen oxides and flue dust is greatly improved, hence it is evident that is better than
Conventional treatment mode；Compared with only with the control group 3-5 of two kinds of bacterial strains, experimental group uses the biologic packing material of three kinds of bacterial strains preparation
Best to the treatment effect of the tail gas generated during production of corn starch, three kinds of pollutants removal rate indexs have certain mention
It rises.
Although above having made detailed explanation to this case with generality explanation and specific embodiment, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
It is made without departing from theon the basis of the spirit of the present invention to modify or improve, it falls within the scope of the claimed invention.
Claims (4)
1. the tail gas treatment process during production of corn starch comprising following steps:
Tail gas is subjected to spray process by spray column first, temperature is down to 35 DEG C hereinafter, subsequently into pulse bag type dust collector,
From bottom to top enter desulfurization and denitrification reaction device again and carry out desulphurization denitration processing, after being disposed, from desulfurization and denitrification reaction device top
Outlet discharge gas；Biologic packing material layer is provided in the reactor.
2. technique according to claim 1, which is characterized in that the biologic packing material layer is prepared in accordance with the following steps:
Step 1) prepares composite bacteria liquid, and step 2 prepares attapulgite modified, and step 3) prepares microballoon, and step 4) prepares biologic packing material
Layer.
3. technique according to claim 1 or 2, which is characterized in that the biologic packing material layer prepare in accordance with the following steps and
:
Step 1) prepares composite bacteria liquid: Acidithiobacillus ferrooxidans strain GF, Paracoccus denitrificans and Nitrobacter winogradskyi are pressed respectively
More solito culture obtains 1 × 108Then the seed liquor of cfu/ml is mixed to get hybrid according to the volume ratio of 3-5:2-3:2-3
Sub- liquid is gone in fermentation medium according still further to 8% inoculum concentration, and 30 DEG C of cultures for 24 hours, obtain composite bacteria liquid；
Step 2 prepares attapulgite modified: the hydrochloric acid that the mass fraction that 2-3 times of weight is added into attapulgite is 10% is molten
Liquid, sonic oscillation 30min, then the dodecyl sodium sulfate for accounting for attapulgite 1-2% parts by weight is added, continue sonic oscillation
30min is then centrifuged for collecting precipitating, obtain attapulgite modified；
Step 3) prepares microballoon: by attapulgite modified, sodium alginate, sodium bicarbonate and water according to 10-20:5-9:3-5:
The mass ratio of 100-200 is uniformly mixed, and the concentration that same volume is then added dropwise is the calcium chloride water of 20-30g/L, and side is added dropwise
Side concussion after being added dropwise, stands 6-9h, collects precipitating, microballoon is made；
Step 4) prepares biologic packing material layer: microballoon and composite bacteria liquid mixed according to the ratio of 1-2kg:2-3L, stand 30min,
Then low temperature drying is carried out, drying temperature is 20 DEG C, and water content is 10wt% after drying, and biologic packing material layer is made.
4. technique according to claim 3, which is characterized in that the formula of the fermentation medium is by mass percentage are as follows:
Molasses 2%, corn flour 1%, urea 0.5%, potassium dihydrogen phosphate 0.5%, epsom salt 0.05%, ferrous sulfate heptahydrate
0.01%, manganese sulfate monohydrate 0.01%, surplus are water, pH7.0.
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2018
- 2018-10-16 CN CN201811200176.6A patent/CN109621695A/en active Pending
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| CN1597067A (en) * | 2004-08-25 | 2005-03-23 | 李晓飞 | Method of deodour using biofiltration |
| KR20110023013A (en) * | 2009-08-28 | 2011-03-08 | 유성열 | Apparatus of deodorizing |
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