CN110314534A - A kind of system and method for the absorption formaldehyde based on micro-nano bubble - Google Patents
A kind of system and method for the absorption formaldehyde based on micro-nano bubble Download PDFInfo
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- CN110314534A CN110314534A CN201910532106.9A CN201910532106A CN110314534A CN 110314534 A CN110314534 A CN 110314534A CN 201910532106 A CN201910532106 A CN 201910532106A CN 110314534 A CN110314534 A CN 110314534A
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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
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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Abstract
The system and method for the absorption formaldehyde that the present invention relates to a kind of based on micro-nano bubble.The system includes: that HCHO gas generating unit (7) is connect with micro-nano bubble generator (5), micro-nano bubble generator (5) connect with the bottom end entrance of absorbing reaction tower (1), top offgas outlet and top the absorbing liquid outlet of absorbing reaction tower (1) are connect with liquid circulating apparatus (4) respectively, and liquid circulating apparatus (4) is connect with micro-nano bubble generator (5).This method comprises: forming mixed gas as gas source using HCHO and air, micro-nano bubble aqueous systems are generated by micro-nano bubble generator and capture and aoxidize HCHO, situ absorption HCHO.The system and method device and process flow are simple, and oxidant utilization is high, high to HCHO removal efficiency, without secondary pollution, easily operated.
Description
Technical field
The invention belongs to formaldehyde governing system and method field, in particular to a kind of absorption formaldehyde based on micro-nano bubble
System and method.
Background technique
VOCs refers to volatile organic contaminant pollutant, and harmful components directly affect human health, and VOCs meeting
2.5 precursor of PM is formed, to influence human health indirectly.VOCs mainly includes the substances such as formaldehyde, ammonia, ethylene glycol, esters.
Room air pollution has become the inducement of a variety of diseases, and formaldehyde is then a main aspect for causing room air pollution, main
It to be caused damages by stimulation, sensitization, mutagenesis to human health.Outstanding behaviours is sucking high-concentration formaldehyde
Bronchial asthma etc. can be induced.To reduce formaldehyde pollution, national correlation department has formulated multinomial regulation, as country defends strong committee's publication
Regulation: formaldehyde must not exceed 0.08mg/m in indoor air3.In order to reach these regulated discharge standards, many scientific research works
Author expands lot of experiments for formaldehyde absorbing technology.
Formaldehyde Treatment process both domestic and external mainly has Ozonation, absorption method, photocatalytic oxidation and metal oxide
Method etc., wherein catalytic oxidation technologies are a kind of novel purifying formaldehydes and VOCs technology, can be at room temperature by formaldehyde catalysis point
Solution, purification is thoroughly, without secondary pollution, and has good stability, becomes the hot topic of Recent study and application.High activity and
The noble metal catalyst higher cost of long-life, hinders its popularization and use.Adsorption technology does not effect a permanent cure using wide, deposits
In the fatal disadvantage of reversible adsorption；Photocatalysis technology and lower temperature plasma technology do not go deep into also in practical applications, at present also
It can not achieve visible light photocatalysis, whether the particle fragment generated reforms generation secondary pollution, is not finalized also；It is green to be implanted in
It is beautiful and generous in home decoration, allow people's spirit and QI cleaning, but it is lower to purify air efficiency.
The maximum advantage of catalytic oxidation technologies is exactly that at room temperature can convert gaseous pollutant to nontoxic substance,
It has been inherently eliminated the harm to life and health.From reducing operating cost, improve HCHO degree of oxidation and rate and its low dense
It spends from the point of view of demand of VOCs purification etc., catalysis oxidation absorption process is more promising method.More oxidation is studied at present
Absorption process is mainly Pt/TiO2Method, MnOx and its combined oxidation absorption process etc..Wherein the paint-on technique of noble metal catalyst is not also
Maturation, the powder catalyst of monoblock type module, which falls off, to be difficult to avoid that；The room temperature catalytic oxidation of the other materials PARA FORMALDEHYDE PRILLS(91,95) such as MnOx is also
It is not thorough.
Summary of the invention
The system for the absorption formaldehyde that technical problem to be solved by the invention is to provide a kind of based on micro-nano bubble and side
Method, to overcome the defects of noble metal catalyst catalysis oxidation formaldehyde is at high cost, oxidation effectiveness is bad in the prior art.
The system for absorbing formaldehyde based on micro-nano bubble that the present invention provides a kind of, the system comprises: HCHO gas
Generating device is connect with micro-nano bubble generator, and micro-nano bubble generator is connect with the bottom end entrance of absorbing reaction tower, is inhaled
Receive reaction tower top offgas outlet and top absorbing liquid outlet is connect respectively with liquid circulating apparatus, liquid circulating apparatus with it is micro-
Nano-bubble generator connection；The absorbing reaction tower is equipped with the NaCl absorbing liquid containing oxygen transfer catalyst.
The system also includes air quality detector, aspiration pump and computers；The air quality detector is set respectively
It sets beside liquid circulating apparatus and HCHO gas generating unit, the top offgas outlet of the absorbing reaction tower passes through aspiration pump
It is connect with air quality detector, the computer is connect with the micro-nano bubble generator.
O in the effect of the HCHO gas generating unit mainly guarantee HCHO, air2It is sufficiently mixed.
The method for absorbing formaldehyde based on micro-nano bubble that the present invention also provides a kind of, comprising:
(1) HCHO in HCHO gas generating unit is mixed with air into gas and is passed through micro-nano bubble generator, simultaneously
Deionized water is passed through micro-nano bubble generator, prepares micro-nano bubble aqueous systems, then injects and is equipped with oxygen-containing transfer catalysis
The absorbing reaction tower of the NaCl absorbing liquid of agent, catalysis oxidation absorb HCHO；
(2) in absorbing reaction tower into micro-nano bubble generator, then tail gas and absorbing liquid pass through liquid circulating apparatus
The absorbing reaction tower for being equipped with the NaCl absorbing liquid containing oxygen transfer catalyst is injected, cyclic oxidation absorbs HCHO.
It is 0.1-0.4mg/m that HCHO, which mixes with air HCHO mass concentration in gas, in the step (1)3。
Containing oxygen transfer catalyst in the step (1) is Fe2+Or Mn2+Series catalysts.
Technical principle of the invention is as follows:
The first, chemical principle
(1) reaction equation of air catalysis oxidation HCHO in the gas phase:
2HCHO+O2→2HCOOH
(2) the key reaction course of air catalysis oxidation HCHO in the liquid phase:
(3) key reaction that HCHO is only absorbed by the water
HCHO+H2O→HCHO·H2O
Net reaction is as follows:
The second, micro-nano bubble capture HCHO simultaneously induces O2Aoxidize HCHO, situ absorption HCHO process
By O2The key reaction course for aoxidizing NO in the liquid phase is found out, couples induction O using micro-nano bubble2Carry out HCHO
Oxidative absorption there is good operability, and micro-nano bubble mass-transfer efficiency is higher is conducive to HCHO and O2Preferably into
The exchange of promoting the circulation of qi liquid, accelerates reaction rate.Micro-nano bubble is injected to water high speed by micro-nano bubble generator, it is micro- in water
A variety of oxygen radicals (active oxygen anion, hydrogen ion, hydroxide ion, hydroxyl ion, water oxygen base are generated in nano bubble space
Ion, aqueous electron etc.), the especially hydroxyl free radical reduction potential that has superelevation has superpower oxidation effectiveness.This system is by HCHO
After gas buffer tank is sufficiently mixed, it is passed through micro-nano bubble generator, while deionized water is passed through micro-nano bubble
Generator generates the micro-nano bubble aqueous systems of air/water/HCHO mixing, and high speed is injected to be equipped with to be absorbed containing oxygen transfer catalyst
The gas absorber of liquid mixes sufficiently in gas absorber with absorbing liquid, and oxidative absorption HCHO.
Micro-nano bubble aqueous systems of the present invention containing HCHO carry out sufficiently mixed in absorbing reaction tower and absorbing liquid
It closes, through cyclic absorption device oxidative absorption.
The present invention using micro-nano bubble phase compared with large specific surface area possessed by common blister, there are the time it is long, itself
Pressurization dissolution, mass-transfer efficiency is high, surface charge formation zeta potential is high and can release the advantages characteristics such as free radical, utilizes
Gas source of the HCHO gas as micro-nano bubble, the Low Concentration NaCl Solution that configuration contains transition metal ion are situated between as absorption
Matter implements the oxidative absorption to HCHO under normal temperature and pressure conditions.The micro-nano bubble typically refer to diameter be 50 μm~
The ultra micro minute bubbles of 200nm.The solubility of micro-nano bubble in water is more than 85%, and micro-nano bubble is the side with bubble
Formula long-time (rate of climb 6cm/ minutes) retains in water, itself pressurization dissolution in uphill process, can constantly Xiang Shuizhong
Active oxygen is supplemented, to achieve the purpose that fully oxidized HCHO, improve catalysis oxidation absorption efficiency.
Beneficial effect
Compared with existing absorption system, the present invention has the advantage that
(1) catalyst utilization is high.
(2) high-efficient for HCHO oxidative absorption.
(3) low energy consumption, without large size energy consuming equipment.
(4) final absorbing liquid is ethylene glycol organic liquid, and implementable recycling does not generate secondary pollution.
(5) simple process, device composition is simple, easily operated.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams of the system and device of micro-nano bubble absorption formaldehyde.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Embodiment 1
The system for present embodiments providing a kind of absorption formaldehyde based on micro-nano bubble, comprising: HCHO gas fills
It sets 7 to connect with micro-nano bubble generator 5, micro-nano bubble generator 5 is connect with the bottom end entrance of absorbing reaction tower 1, is absorbed
Reaction tower 1 top offgas outlet and top absorbing liquid outlet connect respectively with liquid circulating apparatus 4, liquid circulating apparatus 4 and
Micro-nano bubble generator 5 connects, and air quality detector 3 is separately positioned on liquid circulating apparatus 4 and HCHO gas fills
Set 7 sides, the top offgas outlet of absorbing reaction tower 1 is connect by aspiration pump 2 with air quality detector 3, computer 6 with it is micro-
Nano-bubble generator 5 connects；Absorbing reaction tower 1, which is equipped with, contains MnCl2·4H2NaCl (traditional Chinese medicines) absorbing liquid of O (traditional Chinese medicines).
The method for absorbing formaldehyde based on micro-nano bubble that the present invention also provides a kind of, specifically:
(1) micro-nano bubble generator 5 is LF02-PT type device for generating super-fine air bubble (the limited public affairs of the upper permanent environmental protection science and technology of sea-run
Department), the volume of absorbing reaction tower 1 is 1L, checks above system device air-tightness and watertightness.
(2) preparing HCHO mass concentration is 0.4mg/m3Air gas mixture, use MnCl24H2O prepares 2mmol/L's
Absorbing liquid 1L, NaCl is put into absorbing liquid, makes NaCl mass concentration 0.7g/L in absorbing liquid, and 12 are put into absorbing liquid
Sodium alkyl sulfate (SDS) (traditional Chinese medicines), makes SDS mass concentration 7mg/L, and absorbing liquid is passed through absorbing reaction tower 1.
(3) HCHO in HCHO gas generating unit 7 is mixed with air into gas and is passed through micro-nano bubble generator 5, together
When deionized water is passed through micro-nano bubble generator 5, control micro-nano bubble inlet flow-patterm=4 of machine occur and (hydrochloric acid tune is added
Save pH), flow of inlet water 300mL/min, control charge flow rate is 48mL/min, and control admission pressure is 0.5MPa, is prepared micro-
Nano bubble aqueous systems, then inject the absorbing reaction tower 1 for being equipped with absorbing liquid, and catalysis oxidation absorbs HCHO.
(4) tail gas and absorbing liquid pass through liquid circulating apparatus 4 into micro-nano bubble generator 5, so in absorbing reaction tower 1
The absorbing reaction tower 1 for being equipped with absorbing liquid is injected afterwards, and cyclic oxidation absorbs HCHO.HCHO oxidative absorption efficiency has reached 83.8%.
Embodiment 2
The system and method for present embodiments providing a kind of absorption formaldehyde based on micro-nano bubble, will be in embodiment 1
MnCl2·4H2O changes FeSO into4·7H2O (traditional Chinese medicines), remaining is same as Example 1, and catalysis oxidation absorbs HCHO.HCHO oxidation
Absorption efficiency is 79.6%.
Comparative example 1
Peng Fen is tested for application of the micro-nano bubbler techniques in spraying waste gas pollution control and treatment, and test is broadly divided into two
Point: first is that the capture of coating cloud is directed to, second is that being directed to the purification of exhaust gas.The capture effect of coating cloud mainly according to whole visual observation with
And the viscous situation that disappears is felt, the purification efficiency of exhaust gas is calculated according to portable VOCs detector data measured.Test is adopted
Cut-off, which connects, is placed in certain distance immediately ahead of micro-nano bubble air inlet for spray gun.Firstly, micro-nano bubble generator is not turned on,
Spray is opened, then spray gun is opened, is painted with certain jet velocity and discharge rate, after exhaust gas concentration is stablized, is used
Portable exhaust gas concentration detector measures the primary data before waste gas purification, then opens micro-nano bubble generator, a period of time
Afterwards, purified data are measured.It can be seen that from result, coating cloud capture effect is preferable, assembles at agglomerate, can be by coating cloud after salvaging
It is purified.From obtained test data it is found that concentration is 222~390ppm before VOCs is purified, concentration is 92 after VOCs purification
~155ppm.Show that micro-nano bubbler techniques have certain clean-up effect to spraying exhaust gas, but efficiency be not it is very high, on 60% left side
The right side, far below the absorption efficiency of bubble PARA FORMALDEHYDE PRILLS(91,95) micro-nano in the present invention.
Claims (5)
1. a kind of system of the absorption formaldehyde based on micro-nano bubble, which is characterized in that the system comprises: HCHO gas occurs
Device (7) is connect with micro-nano bubble generator (5), the bottom end entrance of micro-nano bubble generator (5) and absorbing reaction tower (1)
Top offgas outlet and top the absorbing liquid outlet of connection, absorbing reaction tower (1) are connect with liquid circulating apparatus (4) respectively, liquid
Body circulation device (4) is connect with micro-nano bubble generator (5)；The absorbing reaction tower (1) is equipped with containing oxygen transfer catalyst
NaCl absorbing liquid.
2. system according to claim 1, which is characterized in that the system also includes air quality detectors (3), aspiration pump
(2) and computer (6)；The air quality detector (3) is separately positioned on the liquid circulating apparatus (4) and the HCHO gas
Beside body generating device (7), the top offgas outlet of the absorbing reaction tower (1) passes through the aspiration pump (2) and the air
Mass detecting instrument (3) connection, the computer (6) connect with the micro-nano bubble generator (5).
3. a kind of method of the absorption formaldehyde based on micro-nano bubble, comprising:
(1) HCHO in HCHO gas generating unit (7) is mixed with air into gas and is passed through micro-nano bubble generator (5), together
When deionized water is passed through micro-nano bubble generator (5), then inject and be equipped with the NaCl absorbing liquid containing oxygen transfer catalyst
Absorbing reaction tower (1), catalysis oxidation absorb HCHO；
(2) tail gas and absorbing liquid pass through liquid circulating apparatus (4) entrance micro-nano bubble generator (5) in absorbing reaction tower (1),
Then the absorbing reaction tower (1) for being equipped with the NaCl absorbing liquid containing oxygen transfer catalyst is injected, cyclic oxidation absorbs HCHO.
4. method according to claim 3, which is characterized in that HCHO mixes with air HCHO matter in gas in the step (1)
Amount concentration is 0.1-0.4mg/m3。
5. method according to claim 3, which is characterized in that containing oxygen transfer catalyst in the step (1), (2) is Fe2+Or
Mn2+Series catalysts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910532106.9A CN110314534A (en) | 2019-06-19 | 2019-06-19 | A kind of system and method for the absorption formaldehyde based on micro-nano bubble |
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| CN201910532106.9A CN110314534A (en) | 2019-06-19 | 2019-06-19 | A kind of system and method for the absorption formaldehyde based on micro-nano bubble |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111068515A (en) * | 2019-12-30 | 2020-04-28 | 东华大学 | Device for indirectly catalyzing and oxidizing diesel vehicle tail gas pollutants by air micro-nano bubbles |
| CN112044443A (en) * | 2020-09-16 | 2020-12-08 | 东华大学 | Micro-nano bubble catalyst and preparation method and application thereof |
| CN112827348A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院上海高等研究院 | Exhaust gas treatment system and exhaust gas treatment method |
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| CN108465376A (en) * | 2018-02-02 | 2018-08-31 | 东华大学 | A kind of wet denitration system and method absorbing flue gas based on air catalytic oxidation |
| CN109126421A (en) * | 2018-10-09 | 2019-01-04 | 河北科技大学 | A kind of system and its workflow handling high concentration VOCs gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112827348A (en) * | 2019-11-25 | 2021-05-25 | 中国科学院上海高等研究院 | Exhaust gas treatment system and exhaust gas treatment method |
| CN111068515A (en) * | 2019-12-30 | 2020-04-28 | 东华大学 | Device for indirectly catalyzing and oxidizing diesel vehicle tail gas pollutants by air micro-nano bubbles |
| CN112044443A (en) * | 2020-09-16 | 2020-12-08 | 东华大学 | Micro-nano bubble catalyst and preparation method and application thereof |
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Application publication date: 20191011 |