CN109865425A - A kind of device and method of catalytic oxidation treatment exhaust gas - Google Patents
A kind of device and method of catalytic oxidation treatment exhaust gas Download PDFInfo
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- CN109865425A CN109865425A CN201711249513.6A CN201711249513A CN109865425A CN 109865425 A CN109865425 A CN 109865425A CN 201711249513 A CN201711249513 A CN 201711249513A CN 109865425 A CN109865425 A CN 109865425A
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- exhaust gas
- catalytic oxidation
- ferrum
- oxidation treatment
- based catalyst
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Abstract
The present invention relates to a kind of device and method of catalytic oxidation treatment exhaust gas.The device of the catalytic oxidation treatment exhaust gas includes catalyst oxidation reactor, the ferrum-based catalyst packed bed and dioxygen water sprinkler system for carrying out catalysis oxidation to exhaust gas are equipped in the catalyst oxidation reactor, the dioxygen water sprinkler system is located at the top of the ferrum-based catalyst packed bed, is additionally provided with the exhaust gas inlet below ferrum-based catalyst packed bed and the clean gas outlet above dioxygen water sprinkler system on catalyst oxidation reactor.The device of catalytic oxidation treatment exhaust gas provided by the invention, after exhaust gas enters catalyst oxidation reactor, into ferrum-based catalyst packing layer, the surface of ferrum-based catalyst forms H after dioxygen water sprinkler system spray2O2Film, and the extremely strong hydroxyl radical free radical of oxidation susceptibility (OH) and elemental oxygen (O) are generated, and then the pollutant in exhaust gas is removed by catalytic oxidation, achieve the purpose that tail gas qualified discharge.
Description
Technical field
The invention belongs to the catalytic oxidation treatment fields of exhaust gas, and in particular to a kind of device of catalytic oxidation treatment exhaust gas and
Method.
Background technique
A large amount of discharges of industrial waste gas are effectively controlled industrial waste gas one of the main reason for causing atmosphere pollution
Reason realizes qualified discharge, is one of the effective way for alleviating atmosphere pollution.Currently, the industrial waste gas in China mainly includes thermoelectricity
The flue gas of factory's discharge and the VOCs etc. of various industrial enterprises discharge.The major pollutants of flue gas are NOx、SOx, VOCs include hydro carbons,
The organic pollutants such as alcohols, phenols, ketone, nitro class, ethers, esters, aldehydes.
Currently, NO in processing flue gasx、SOxMethod mainly have wet flue gas desulfurization, selective catalytic reduction, selectivity it is non-
Be catalyzed reduction/denitration combination technique etc., wet flue gas desulfurization frequently with lime or lime stone calcium method, the disadvantage is that equipment is huge
Greatly, investment cost is high, operating cost is high, be easy to cause secondary pollution.Processing VOCs method mainly have condensation method, absorption method,
Absorption process, UF membrane, oxidizing process etc., but treatment effeciency is lower, processing cost is higher, and in general, treatment effect is difficult to enable work
Industry enterprise receives.
Summary of the invention
The purpose of the present invention is to provide a kind of devices of catalytic oxidation treatment exhaust gas, to solve the processing of existing exhaust gas
The problem that existing treatment effeciency is low, processing cost is high.
Second object of the present invention is to provide a kind of method of catalytic oxidation treatment exhaust gas.
To achieve the above object, the technical solution of the device of catalytic oxidation treatment exhaust gas of the invention is:
A kind of device of catalytic oxidation treatment exhaust gas, including catalyst oxidation reactor are set in the catalyst oxidation reactor
There are the ferrum-based catalyst packed bed and dioxygen water sprinkler system for carrying out catalysis oxidation to exhaust gas, the dioxygen water sprinkler system
Positioned at the top of the ferrum-based catalyst packed bed, it is additionally provided on catalyst oxidation reactor below ferrum-based catalyst packed bed
Exhaust gas inlet and the clean gas outlet above dioxygen water sprinkler system.
The device of catalytic oxidation treatment exhaust gas provided by the invention, after exhaust gas enters catalyst oxidation reactor, entrance is iron-based
The surface of catalyst filling layer, ferrum-based catalyst forms H after dioxygen water sprinkler system spray2O2Film, and generate oxidation susceptibility pole
Strong hydroxyl radical free radical (OH) and elemental oxygen (O), and then the pollutant in exhaust gas is removed by catalytic oxidation, reach
The purpose of tail gas qualified discharge.
The purification of the desulphurization denitration and VOCs of flue gas may be implemented in the device, and the reaction equation that working principle is related to is as follows:
NO in flue gasxNitric acid is converted under OH effect:
NOx+O2+H2O+·OH→HNO3；
SO in flue gas2It is dissolved in water and generates H2SO3, and it is further converted to sulfuric acid:
SO2+H2O→H2SO3；
H2SO3+O2→H2SO4；
VOCs is CO by OH, O oxygenolysis2、H2O etc.:
VOCs+·OH→CO2+H2O+ is other.
At work, exhaust gas issues the device of catalytic oxidation treatment exhaust gas of the invention in the catalytic action of ferrum-based catalyst
The raw heterogeneous Fenton's reaction of gas liquid solid, has the characteristics that contact area is big, treatment effeciency is high, processing cost is low.
In the catalyst oxidation reactor, it is equipped between exhaust gas inlet and ferrum-based catalyst packing layer for useless
The gas humidification system that gas is humidified.Humidification process is carried out to exhaust gas, water soluble ingredient and the adsorbable particle of water is can remove, adds
Wet exhaust gas may be that subsequent catalyst oxidation reaction is got ready, and improve the catalysis oxidation efficiency.
The ferrum-based catalyst is the pig iron, ferriferous oxide or molysite.Using the pig iron as catalyst, discarded iron not only may be implemented
Recycling, and can use iron-carbon micro-electrolysis reaction and advanced optimize treatment effect to exhaust gas.
The ferrum-based catalyst is spheric granules or laminated structure.The diameter of spheric granules is 3-5mm.Using the preferred side
The ferrum-based catalyst of case has the characteristics that treatment effeciency is high, air resistance is small, operating cost is low.
The leakage fluid dram for waste liquid to be discharged and the manhole for replacing ferrum-based catalyst are additionally provided on the catalytic reactor.
The main component of waste liquid is nitric acid, sulfuric acid etc., can further add pulverized limestone neutralization, and Lai Shixian waste utilization avoids secondary dirt
Dye.
The technical solution of the method for catalytic oxidation treatment exhaust gas of the invention is:
A kind of method of catalytic oxidation treatment exhaust gas, comprising: exhaust gas and spray are had to the ferrum-based catalyst of hydrogen peroxide solution
Carry out catalytic oxidation.
Before carrying out catalytic oxidation, the exhaust gas is subjected to humidification process.By exhaust gas by humidification pretreatment, can go
Except water soluble ingredient and the adsorbable particle of water, reduces subsequent contamination object load and get ready for subsequent catalyst oxidation reaction, mention
High the catalysis oxidation efficiency.
H in the hydrogen peroxide solution2O2Mass concentration be at least 8%.Adjust pH value≤5 of hydrogen peroxide solution.It can pass through
Add the H of high concentration2O2And acid, meet above-mentioned condition to adjust hydrogen peroxide solution.
The exhaust gas is the flue gas containing nitrogen oxides and oxysulfide, and flue gas is through catalytic oxidation by-product nitric acid, sulphur
Acid solution is added lime into nitric acid, sulfuric acid solution and is neutralized, recycles CaSO4With Ca (NO3)2。
The technique of catalytic oxidation treatment exhaust gas of the invention, technique is environmentally protective, operating cost is low, applied widely, no
Desulphurization and denitration and the purifying VOCs etc. that can be only used for flue gas, can also be individually used for desulphurization and denitration or VOCs purified treatment.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the device of catalytic oxidation treatment exhaust gas of the invention.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
The specific embodiment of the device of catalytic oxidation treatment exhaust gas of the invention, as shown in Figure 1, including catalytic oxidation
Device 6, the interior ferrum-based catalyst packed bed 3 being equipped with for carrying out catalysis oxidation to exhaust gas of catalyst oxidation reactor 6 and hydrogen peroxide spray
Leaching system 5, dioxygen water sprinkler system 5 are located at the top of ferrum-based catalyst packed bed 3, and catalyst oxidation reactor 6, which has, is located at iron
Exhaust gas inlet 1 below base catalyst filling bed and the clean gas outlet 8 above dioxygen water sprinkler system.
Dioxygen water sprinkler system 5 includes the spray pipeline 53 for being connected with multiple spray heads 50, and spray pipeline 53 is by being located at
Connecting pipe 51 outside catalyst oxidation reactor is connected with dioxygen water storage tank 52, is loaded with hydrogen peroxide in dioxygen water storage tank 52
Solution is also connected with spray pump in connecting pipe 51.
Ferrum-based catalyst packed bed can be the discarded pig iron, ferriferous oxide or molysite.Ferriferous oxide may be selected iron oxide,
Ferrous sulfate etc. may be selected in ferroso-ferric oxide etc., molysite.Ferrum-based catalyst can be the spheric granules or sheet knot of diameter 3-5mm
Structure etc..Use the pig iron as ferrum-based catalyst, not only realizes the disposition of discarded iron, but also it is anti-to can use iron-carbon micro-electrolysis
It answers, the synergistic effect of the heterogeneous Fenton's reaction of gas liquid solid, improves the catalytic oxidation treatment effect to exhaust gas.
It is additionally provided between exhaust gas inlet 1 and ferrum-based catalyst packed bed 3 for exhaust gas in catalyst oxidation reactor
The gas humidification system 2 humidified.Gas humidification system 2 includes the substrate with the communication bores structure uniformly intensively arranged
With the multiple fog-spray nozzles being set on base lower surface, the substrate is circular slab, the periphery of circular slab and catalyst oxidation reactor
Inner wall be fixedly connected.
The leakage fluid dram 7 that is additionally provided on the catalyst oxidation reactor 6 below exhaust gas inlet and for replacing iron-based urge
The manhole 4 of agent.
At runtime, exhaust gas is entered in catalyst oxidation reactor the device of above-mentioned catalysis oxidation exhaust gas by exhaust gas inlet, warp
After humidification process, water soluble ingredient and the adsorbable particle of water are removed, ferrum-based catalyst packing layer, the table of ferrum-based catalyst are entered back into
Face forms H after dioxygen water sprinkler system spray2O2Film, and generate the extremely strong hydroxyl radical free radical of oxidation susceptibility (OH) and atom
Oxygen (O), and then NO is oxidized to NO2(be dissolved in afterwards water generate nitric acid), by SO2It is oxidized to SO3It (be dissolved in water afterwards and generate sulfuric acid), will
VOCs is oxidized to carbon dioxide and water etc., to make tail gas by clean gas outlet qualified discharge.The nitre that catalytic oxidation process generates
Acid, hydrochloric acid can be neutralized by adding pulverized limestone, the CaSO that N-process generates4Precipitating is returned by clearing up bed mud mode
It receives, the Ca (NO of generation3)2It can be recycled by decrease temperature crystalline mode, and be used for agricultural production as fertilizer.
In the other embodiments of the device of catalytic oxidation treatment exhaust gas of the invention, gas humidification system be can be used directly
It is realized to the form of catalyst oxidation reactor internal spraying；Ferrum-based catalyst packed bed can be designed to bilayer or multilayer as needed.
The embodiment of the method for catalytic oxidation treatment exhaust gas of the invention deals with objects as organic fertilizer enterprise through dust removal process
Exhaust gas afterwards is handled using the device of above-mentioned catalytic oxidation treatment exhaust gas, is specifically included: after the humidified processing of exhaust gas,
There is the ferrum-based catalyst of hydrogen peroxide solution to carry out catalytic oxidation with spray again.
Ferrum-based catalyst be the sheet pig iron, ferrum-based catalyst filling batch with a thickness of 50cm.The quality of hydrogen peroxide solution
Concentration is 8%, and the pH value of regulation system is 5.
It is handled using the exhaust gas that the method for the present embodiment generates organic fertilizer enterprise, VOCs (alcohols, aldehyde in exhaust gas
Class, phenols etc.) processing before concentration be 265mg/m3, concentration that treated is 13.52mg/m3, removal rate reaches 94.9%, place
Tail gas after reason meets national emission standard.
Claims (9)
1. a kind of device of catalytic oxidation treatment exhaust gas, which is characterized in that including catalyst oxidation reactor, the catalysis oxidation is anti-
Answer the ferrum-based catalyst packed bed and dioxygen water sprinkler system being equipped in device for carrying out catalysis oxidation to exhaust gas, the hydrogen peroxide
Spray system is located at the top of the ferrum-based catalyst packed bed, is additionally provided on catalyst oxidation reactor and fills out positioned at ferrum-based catalyst
Expect the exhaust gas inlet below bed and the clean gas outlet above dioxygen water sprinkler system.
2. the device of catalytic oxidation treatment exhaust gas as described in claim 1, which is characterized in that in the catalyst oxidation reactor
It is interior, the gas humidification system for being humidified to exhaust gas is equipped between exhaust gas inlet and ferrum-based catalyst packing layer.
3. the device of catalytic oxidation treatment exhaust gas as described in claim 1, which is characterized in that the ferrum-based catalyst is made a living
Iron, ferriferous oxide or molysite.
4. the device of catalytic oxidation treatment exhaust gas as claimed in claim 1 or 3, which is characterized in that the ferrum-based catalyst is
Spheric granules or laminated structure.
5. a kind of method of catalytic oxidation treatment exhaust gas characterized by comprising exhaust gas and spray are had to the iron of hydrogen peroxide solution
Base catalyst carries out catalytic oxidation.
6. the method for catalytic oxidation treatment exhaust gas as claimed in claim 5, which is characterized in that carrying out catalytic oxidation
Before, the exhaust gas is subjected to humidification process.
7. the method for catalytic oxidation treatment exhaust gas as claimed in claim 5, which is characterized in that H in the hydrogen peroxide solution2O2
Mass concentration be at least 8%.
8. the method for catalytic oxidation treatment exhaust gas as described in claim 5 or 7, which is characterized in that adjust hydrogen peroxide solution
PH value≤5.
9. the method for catalytic oxidation treatment exhaust gas as claimed in claim 5, which is characterized in that the exhaust gas is to contain nitrogen oxidation
The flue gas of object and oxysulfide, flue gas are added through catalytic oxidation by-product nitric acid, sulfuric acid solution into nitric acid, sulfuric acid solution
Lime is neutralized, and CaSO is recycled4With Ca (NO3)2。
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| CN201711249513.6A CN109865425A (en) | 2017-12-01 | 2017-12-01 | A kind of device and method of catalytic oxidation treatment exhaust gas |
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| CN201711249513.6A CN109865425A (en) | 2017-12-01 | 2017-12-01 | A kind of device and method of catalytic oxidation treatment exhaust gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112915778A (en) * | 2019-12-06 | 2021-06-08 | 中国科学院大连化学物理研究所 | Catalytic oxidation absorption denitration method and device thereof |
| CN114367192A (en) * | 2021-12-29 | 2022-04-19 | 上海发电设备成套设计研究院有限责任公司 | Denitration reaction pretreatment device system and pretreatment method |
| CN114849468A (en) * | 2022-05-28 | 2022-08-05 | 南京沿江资源生态科学研究院有限公司 | Negative pressure collecting and processing and nanometer superoxide catalytic treatment system for chemical laboratory |
| CN117225183A (en) * | 2023-11-16 | 2023-12-15 | 江苏民生重工有限公司 | Tail gas denitration equipment |
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| CN114849468A (en) * | 2022-05-28 | 2022-08-05 | 南京沿江资源生态科学研究院有限公司 | Negative pressure collecting and processing and nanometer superoxide catalytic treatment system for chemical laboratory |
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| CN117225183A (en) * | 2023-11-16 | 2023-12-15 | 江苏民生重工有限公司 | Tail gas denitration equipment |
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