CN110280129A - A kind of heterogeneous class Fenton wet denitration device and method of urea wet desulphurization joint - Google Patents
A kind of heterogeneous class Fenton wet denitration device and method of urea wet desulphurization joint Download PDFInfo
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- CN110280129A CN110280129A CN201910562804.3A CN201910562804A CN110280129A CN 110280129 A CN110280129 A CN 110280129A CN 201910562804 A CN201910562804 A CN 201910562804A CN 110280129 A CN110280129 A CN 110280129A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/106—Peroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
Abstract
The present invention relates to a kind of urea wet desulphurizations to combine heterogeneous class Fenton wet denitration device and method, including the heterogeneous class Fenton wet denitration system of level-one urea liquid desulphurization system, second level and solution recycle system；Level-one urea liquid desulphurization system is arranged in the present invention, utilizes urea liquid efficient removal SO2And generate sulphite；The heterogeneous class Fenton wet denitration system of second level is set, H is utilized2O2The OH oxidative absorption NO generated is catalytically decomposed；Solution recycle system is set, improves absorbent utilization rate, while recycling sulfate；SO is removed by classification2And NOXIt can be to avoid SO2Caused by oxidant waste and NO oxidation efficiency reduce the problems such as；The present invention solves the problems, such as that conventional wet denitration efficiency is low, establishes the desulphurization denitration mode of liquid phase efficient removal flue gas pollutant and product recycling by the way that heterogeneous class Fenton wet denitration system is arranged.
Description
Technical field
The present invention relates to a kind of urea wet desulphurizations to combine heterogeneous class Fenton wet denitration device and method, belongs to the energy
Environment protection field.
Background technique
Main energy sources of the coal as China account for about 70% in China's non-renewable energy, and coal production and consumption have come generation
Boundary is the first.SO can be generated in coal combustion process2、NOx、CO2, the multiple harmful substances such as flue dust and micro heavy, cause all
Such as serious environmental problem of acid rain, greenhouse effects, photochemical fog, haze.Environmental problem caused by pollution that caused by coal burning at
One of an important factor for influence China's sustainable development.Currently, mainly passing through wet desulfurization of flue gas by limestone-gypsum method both at home and abroad
Technique, selective non-catalytic reduction (SNCR) or selective catalytic reduction (SCR) technique distinguish desulphurization and denitration to flue gas to reduce
SO2And NOXDischarge amount.Combined desulfurization and denitration can realize SO2And NOXEfficient removal, but exist take up a large area, invest and
The defects of operating cost is higher and complex process, and wet flue gas simultaneous SO_2 and NO removal is because of its technique and equipment is simple, by-product
Object such as can utilize to become the research hotspot of current countries in the world smoke gas treatment technology, and the main hair of smoke gas treatment from now at the advantages
Open up direction.
Urea has alkalescent, aqueous solution is to SO as a kind of strong reductant2With very high removal efficiency, desulfurization
Product is recyclable ammonium sulfate, avoids the generation of a large amount of desulfurized gypsums；Urea energy and NO simultaneouslyxIt is anti-that redox occurs
It answers, generates harmless N2It arranges in National People's Congress's gas, avoids generating secondary pollution.Therefore, urea wet flue gas simultaneous SO_2 and NO removal conduct
One new wet desulphurization denitration technology has potential researching value.Domestic scholars are using simulated flue gas in different reactor
A large amount of experimental study is carried out to urea wet process simultaneous SO_2 and NO removal, research shows that due to flue gas NOXMiddle NO proportion is high
Up to 90% or more, and NO is practically insoluble in water also not with alkaline reaction, and denitration efficiency is relatively low, need to add small amounts agent to promote
NO is oxidized into NO2, to realize high-efficiency desulfurization denitration simultaneously.To improve wet denitration efficiency, common oxidant has
NaClO2、KMnO4、H2O2And O3Deng；Wherein H2O2Final decomposition product is nontoxic water and oxygen, not will cause secondary pollution,
Constructing decomposable generate of heterogeneous class Fenton oxidation system by addition ferriferous oxide loaded catalyst has more high oxidative
OH free radical, have at the same remove multiple pollutant (SO2、NO、Hg0) ability.But due to SO2It can be taken off easily by urea
It removes, to avoid SO2Consumption to heterogeneous class Fenton oxidation system reduces the oxidative absorption efficiency of NO and improves the use of oxidant
Amount increases operating cost, therefore by the way of classification removing.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provides a kind of heterogeneous class Fenton of urea wet desulphurization joint
Wet denitration device and method solves the problems, such as that denitration efficiency is low in wet desulphurization denitrification process.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of heterogeneous class Fenton wet denitration device of urea wet desulphurization joint, including level-one urea liquid desulphurization system, two
The heterogeneous class Fenton wet oxidation denitrating system of grade and solution recycle system；The level-one urea liquid desulphurization system and second level
Heterogeneous class Fenton wet oxidation denitrating system is connected, and the level-one urea liquid desulphurization system and the heterogeneous class Fenton of second level are wet
Method oxidation and denitration system is connected with solution recycle system；The level-one urea liquid desulphurization system includes compressor one, liquid storage
Tank one, urea liquid absorption plant and feed pipe one；The compressor one is connected with urea liquid absorption plant bottom end, described
One one end of fluid reservoir is connected with feed pipe one, and one other end of fluid reservoir is connected with urea liquid absorption plant top；It is described
The heterogeneous class Fenton wet oxidation denitrating system of second level includes heterogeneous class Fenton oxidation absorption plant, compressor two, fluid reservoir
Two and feed pipe two, the compressor two be connected with heterogeneous class Fenton oxidation absorption plant bottom end, the fluid reservoir 21
End is connected with feed pipe two, and two other end of fluid reservoir is connected with heterogeneous class Fenton oxidation absorption plant top；The urine
Plain solution absorption plant top is connected with compressor two.
As an improvement of the present invention, the solution recycle system includes three-phase inversion valve, sulfite oxidation pond
And crystallization apparatus；Urea liquid absorption plant bottom end by sulfite oxidation pond successively with crystallization apparatus, fluid reservoir
One is connected；The heterogeneous class Fenton oxidation absorption plant bottom end is connected with three-phase inversion valve, the three-phase inversion valve one
End is connected with fluid reservoir two, and the three-phase inversion valve other end is connected with sulfite oxidation pond.
As an improvement of the present invention, metering is equipped between the urea liquid absorption plant and sulfite oxidation pond
Pump three.
As an improvement of the present invention, metering pump five is equipped between the crystallization apparatus and fluid reservoir two.
As an improvement of the present invention, it is set between the heterogeneous class Fenton oxidation absorption plant and three-phase inversion valve
There is metering pump four.
As an improvement of the present invention, gas distributor one and demister are equipped in the urea liquid absorption plant
One, in urea liquid absorption plant inside bottom, the demister one is arranged in urea liquid for the setting of gas distributor one
Absorption plant inside top.
As an improvement of the present invention, metering pump one is equipped between the fluid reservoir one and urea liquid absorption plant；
The feed pipe one is equipped with valve one.
As an improvement of the present invention, it is successively arranged from top to bottom on the inside of the heterogeneous class Fenton oxidation absorption plant
Gas distributor two, catalyst filling, liquid atomizing nozzle and demister two, the liquid atomizing nozzle and fluid reservoir two-phase
Even, gas distributor two is located at the bottom in heterogeneous class Fenton oxidation absorption plant two, and catalyst filling is located at heterogeneous class
Middle part in Fenton oxidation absorption plant two, liquid atomizing nozzle are located at catalyst filling top, and demister two is located at heterogeneous
Top in class Fenton oxidation absorption plant two.
As an improvement of the present invention, meter is equipped between the fluid reservoir two and heterogeneous class Fenton oxidation absorption plant
Amount pump two.
As an improvement of the present invention, the feed pipe two is equipped with valve two.
As an improvement of the present invention, heterogeneous class Fenton wet denitration method, step are combined in the urea wet desulphurization
It is rapid as follows:
(1) in level-one urea liquid desulphurization system, flue gas is sent into via compressor one, enters urea by gas distributor one
In solution absorption plant, urea absorption liquid is sent into urea liquid absorption plant by metering pump one from fluid reservoir one, the gas of generation
Flue gas enters the heterogeneous class Fenton wet oxidation denitrating system of second level after liquid mixture completes gas-liquid separation by demister one；
(2) in the heterogeneous class Fenton wet oxidation denitrating system of second level, the flue gas of scrubbing CO_2 is sent via compressor two
Enter, heterogeneous class Fenton oxidation absorption plant is entered by gas distributor two, hydrogen peroxide absorbing liquid is sent into liquid through metering pump two
Cleaning flue gases are discharged into atmosphere after demister two completes gas-liquid separation by the gas-liquid mixture of body atomizer, generation；
(3) in solution recycle system, the urea mixed solution containing sulphite formed in urea liquid absorption plant is passed through
Metering pump three is sent into sulfite oxidation pond, formed in heterogeneous class Fenton oxidation absorption plant containing nitrous acid, nitric acid
Hydrogen peroxide solution is sent into fluid reservoir two through metering pump four and three-phase inversion valve, after nitrous acid and nitric acid content reach setting value
It is sent into sulfite oxidation pond after being reacted, is passed through and is precipitated into crystallization apparatus, residual mixed liquor is sent by metering pump five
Fluid reservoir one forms urea absorption liquid after urea is added.
As an improvement of the present invention, the method for heterogeneous class Fenton oxidation denitration is combined in a kind of urea wet desulphurization,
The following steps are included: urea liquid absorbs the sulfur dioxide in flue gas firstly, flue gas is passed through level-one urea liquid desulphurization system
And it is converted into sulphite, the flue gas after desulfurization enters the heterogeneous class Fenton wet oxidation denitrating system of second level through demister one,
Urea liquid containing sulphite is sent into solution recycle system；In the heterogeneous class Fenton wet oxidation denitrating system of second level,
Flue gas and hydrogen peroxide solution are contacted in catalyst filling surface counter-current, and hydrogen peroxide catalytic decomposition generates the OH free radical of high activity
Aoxidizing the nitric oxide in flue gas is diffluent higher nitrogen oxides, and nitrous acid, the nitric acid generated after dissolution, flue gas is through removing
It is discharged after day with fog two, the hydrogen peroxide solution containing nitrous acid, nitric acid is sent into solution recycle system；In solution recycle system, two
After being reacted in the heterogeneous class Fenton wet oxidation denitrating system of grade containing nitrous acid, nitric acid solution through three-phase inversion valve press than
Example is sent into sulfite oxidation pond and fluid reservoir two, the urine containing sulphite after reacting in level-one urea liquid desulphurization system
Plain solution is sent into sulfite oxidation pond, in sulfite oxidation pond sulphite by nitrous acid, nitric acid and hydrogen peroxide and
Dioxygen oxidation is sulfate, is passed through fluid reservoir one after being proportionally added into urea in the solution after crystallized removing sulfate.
As an improvement of the present invention, in the heterogeneous class Fenton wet oxidation denitrating system of the second level, catalyst is filled out
Material area load has ferriferous oxide catalyst, generates OH free radical for being catalyzed decomposing hydrogen dioxide solution.
As an improvement of the present invention, the level-one urea liquid desulphurization system and the heterogeneous class Fenton wet process oxygen of second level
Change in denitrating system, reaction temperature should be controlled at 20-80 DEG C, operating pressure 0-0.5MPa.
Due to using the above technology, the present invention compared with the prior art, is had the advantage that as follows:
The method and device thereof of heterogeneous class Fenton wet oxidation denitration are combined in a kind of urea wet desulphurization of the invention, by desulfurization
It is removed in two absorption towers respectively with denitration, firstly, using urea liquid efficient removal sulfur dioxide and generating sulphite；
Secondly, being that diffluent higher nitrogen oxides are gone forward side by side using the OH free-radical oxidation nitric oxide that hydrogen peroxide catalytic decomposition generates
Enter liquid phase；Finally, converting nitrogen for nitrous acid and nitric acid using the reproducibility of urea and sulphite, while generating stable
Sulfate recoverable.It can be caused by classification scrubbing CO_2 and nitrogen oxides to avoid oxidizing sulfur dioxide
Oxidant waste and oxidization of nitric oxide efficiency it is lower the problems such as.By this method and device, solves conventional wet denitration
The problem of low efficiency, establishes the desulphurization denitration mode of liquid phase efficient removal flue gas pollutant and product recycling.
The present invention considers main vapor phase contaminants sulfur dioxide and nitric oxide production dissolution characteristics in flue gas, molten using urea
Liquid sulfur dioxide absorption, the nitric oxide production classification removing sulfuldioxide of hydrogen peroxide catalytic oxidation realize the efficient de- of flue gas pollutant
It removes；
The reproducibility for the sulfite solution that the present invention makes full use of urea liquid and urea liquid sulfur dioxide absorption to generate, will
Nitrogen oxides enters the nitrous acid generated after liquid phase and nitric acid is converted into harmless nitrogen, and obtains stable sulfate, can make
Resource utilization utilization is carried out for fertilizer, and then reduces part operating cost.
Hydrogen peroxide catalytic decomposition of the present invention, which generates the nitric oxide production reaction of OH free-radical oxidation, to be carried out at normal temperature, together
When satisfactory catalyst be easier to obtain and relative low price.
Part dust and impurity can be washed away while wet process removing flue gas pollutant of the present invention；The absorbent used is urine
Element, oxidant are hydrogen peroxide, can directly decompose and be not present the secondary pollution to environment in the environment, meet environmentally friendly
The theory of chemical process.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that heterogeneous class Fenton wet denitration device is combined in a kind of urea wet desulphurization；
In figure: 1, compressor one, 2, gas distributor one, 3, urea liquid absorption plant, 4, demister one, 5, compressor two,
6, gas distributor two, 7, catalyst filling, 8, liquid atomizing nozzle, 9, demister two, 10, the absorption of heterogeneous class Fenton oxidation
Device, 11, metering pump three, 12, metering pump one, 13, fluid reservoir one, 14, metering pump five, 15, crystallization apparatus, 16, sulphite
Oxidation pond, 17, metering pump four, 18, three-phase inversion valve, 19, fluid reservoir two, 20, metering pump two, 21, valve two, 22, valve
One, 23, feed pipe one, 24, feed pipe two.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated.
In conjunction with attached drawing as it can be seen that as shown in Figure 1, heterogeneous class Fenton wet oxidation method of denitration is combined in urea wet desulphurization
Device, including level-one urea liquid desulphurization system A, the heterogeneous class Fenton wet oxidation denitrating system B of second level, solution recycle system
C；The level-one urea liquid desulphurization system is connected with the heterogeneous class Fenton wet oxidation denitrating system of second level, the level-one urea
Solution desulphurization system is connected with solution recycle system with the heterogeneous class Fenton wet oxidation denitrating system of second level；The level-one urine
Plain solution desulphurization system includes compressor 1, fluid reservoir 1, urea liquid absorption plant 3 and feed pipe 1；The pressure
Mechanism of qi 1 is connected with 3 bottom end of urea liquid absorption plant, and described one 13 one end of fluid reservoir is connected with feed pipe 1, the storage
One 13 other end of flow container is connected with 3 top of urea liquid absorption plant；The heterogeneous class Fenton wet oxidation denitration system of second level
System includes heterogeneous class Fenton oxidation absorption plant 10, compressor 25, fluid reservoir 2 19 and feed pipe 2 24, described to calm the anger
Machine 25 is connected with heterogeneous 10 bottom end of class Fenton oxidation absorption plant, and described 2 19 one end of fluid reservoir is connected with feed pipe 2 24,
2 19 other end of fluid reservoir is connected with heterogeneous 10 top of class Fenton oxidation absorption plant；The urea liquid absorption plant
3 tops are connected with compressor 25.
The solution recycle system includes three-phase inversion valve 18, sulfite oxidation pond 16 and crystallization apparatus 15；Institute
3 bottom end of urea liquid absorption plant is stated successively to be connected with crystallization apparatus 15, fluid reservoir 1 by sulfite oxidation pond 16；Institute
Heterogeneous 10 bottom end of class Fenton oxidation absorption plant is stated to be connected with three-phase inversion valve 18, described 18 one end of three-phase inversion valve with
Fluid reservoir 2 19 is connected, and 18 other end of three-phase inversion valve is connected with sulfite oxidation pond 16.
Metering pump 3 11 is equipped between the urea liquid absorption plant 3 and sulfite oxidation pond 16.
Metering pump 5 14 is equipped between the crystallization apparatus 15 and fluid reservoir 1.
Metering pump 4 17 is equipped between the heterogeneous class Fenton oxidation absorption plant 10 and three-phase inversion valve 18.
Gas distributor 1 and demister 1, the gas distributor are equipped in the urea liquid absorption plant 3
One 2 settings are arranged in 3 inside bottom of urea liquid absorption plant, the demister 1 in 3 medial roof of urea liquid absorption plant
Portion.
Metering pump 1 is equipped between the fluid reservoir 1 and urea liquid absorption plant 3；On the feed pipe 1
Equipped with valve 1.
10 inside of heterogeneous class Fenton oxidation absorption plant is successively arranged gas distributor 26, catalysis from top to bottom
Agent filler 7, liquid atomizing nozzle 8 and demister 29, the liquid atomizing nozzle 8 are connected with fluid reservoir 2 19.Gas distribution
Device 26 is located at the bottom in heterogeneous class Fenton oxidation absorption plant 10, and catalyst filling 7 is located at the suction of heterogeneous class Fenton oxidation
Middle part in receiving apparatus 10, liquid atomizing nozzle 8 are located at 7 top of catalyst filling, and demister 29 is located at heterogeneous class Fenton oxygen
Change the top in absorption plant.
Metering pump 2 20 is equipped between the fluid reservoir 2 19 and heterogeneous class Fenton oxidation absorption plant.
The feed pipe 2 24 is equipped with valve 2 21.
In the present embodiment, flue gas is power plant's tail flue gas, firstly, flue gas removes in level-one urea liquid desulphurization system A
Then sulfur dioxide completes nitric oxide production oxidative absorption in the heterogeneous class Fenton wet oxidation denitrating system B of second level, most
Afterwards, in the desulfurization product in level-one urea liquid desulphurization system A and the heterogeneous class Fenton wet oxidation denitrating system B of part second level
Denitration product further reacted in sulfite oxidation pond 16, remaining after crystallization solution enters level-one urea liquid desulfurization system
System circulation.Detailed process is as follows:
In level-one urea liquid desulphurization system A, flue gas is sent into via compressor 1, by gas distributor 1, in urea
Dispersion bubble is formed in solution absorption plant 3, urea absorption liquid is sent into urea liquid from fluid reservoir 1 by metering pump 1 and is inhaled
In receiving apparatus 3, bubble is contacted and is reacted with urea absorption liquid in uphill process, the sulfur dioxide in flue gas by efficient removal,
Flue gas enters the heterogeneous class Fenton wet oxidation denitrating system of second level after completing gas-liquid separation by demister 1；Meanwhile urea
The mixed solution that the sulphite and urea that solution sulfur dioxide absorption generates are formed enters solution recycle system.During this,
Since heat exchange occurs for flue gas and absorbing liquid, absorbing liquid temperature is at 30-70 DEG C.
In the heterogeneous class Fenton wet oxidation denitrating system B of second level, the flue gas of scrubbing CO_2 is via compressor 25
It is sent into, heterogeneous class Fenton oxidation absorption plant 10 is entered by gas distributor 26, hydrogen peroxide absorbing liquid is through metering pump 2 20
Be sent into liquid atomizing nozzle 8, the fine drop for dispersing to be formed is landed under the effect of gravity, on 7 surface of catalyst filling, flue gas with
Hydrogen peroxide absorbing liquid is contacted and is reacted, and hydrogen peroxide decomposes in catalyst surface and generates OH free radical, will be inhaled after oxidation of nitric oxide
Cleaning flue gases are discharged into atmosphere after demister 29 completes gas-liquid separation at nitrous acid and nitric acid by midwifery.Absorbing liquid after reaction
Into solution recycle system.Catalyst in catalyst filling is ferriferous oxide loaded catalyst, and being supported on has certain ratio
On the filler of surface area；During this, since heat exchange occurs for flue gas and absorbing liquid, absorbing liquid temperature is at 30-70 DEG C.
In solution recycle system C, the urea mixed solution containing sulphite of formation in urea liquid absorption plant 3
It is sent into sulfite oxidation pond 16 through metering pump 3 11, what is formed in heterogeneous class Fenton oxidation absorption plant 10 contains nitrous
Sour, nitric acid hydrogen peroxide solution is sent into fluid reservoir 2 19 through metering pump 4 17 and three-phase inversion valve 18, or runs one in system
After the section time, nitrous acid and nitric acid content reach certain value (setting value) and are sent into sulfite oxidation pond 16 afterwards, in sulphite
In oxidation pond 16, sulphite is reacted with nitrous acid, nitric acid, oxygen and a small amount of hydrogen peroxide, is oxidized to stable sulfate, sulfur-bearing
Ammonium sulfate and ammonium nitrate are precipitated in crystallization apparatus 15 and recycles, remaining urea liquid for the urea liquid of hydrochlorate and nitrate
Fluid reservoir 1 is sent by metering pump 5 14, forms urea absorption liquid after being proportionally added into urea.
It, can be by changing urea absorption liquid recycle stream amount and suction in level-one urea liquid desulphurization system in the present embodiment
Liquid urea content is received to adjust the removal efficiency of sulfur dioxide；It, can in the heterogeneous class Fenton wet oxidation denitrating system of second level
Nitric oxide removal efficiency is adjusted by adjusting hydrogen peroxide concentration and circular flow.
Above-described embodiment is only the preferred technical solution of the present invention, and is not construed as limitation of the invention, the present invention
Protection scope should with claim record technical solution, including claim record technical solution in technical characteristic etc.
It is protection scope with alternative, i.e., equivalent replacement within this range is improved, also within protection scope of the present invention.
Claims (10)
1. heterogeneous class Fenton wet denitration device is combined in a kind of urea wet desulphurization, it is characterised in that: molten including level-one urea
The heterogeneous class Fenton wet oxidation denitrating system of liquid desulphurization system, second level and solution recycle system；The level-one urea liquid
Desulphurization system is connected with the heterogeneous class Fenton wet oxidation denitrating system of second level, the level-one urea liquid desulphurization system and second level
Heterogeneous class Fenton wet oxidation denitrating system is connected with solution recycle system；The level-one urea liquid desulphurization system includes
Compressor one, fluid reservoir one, urea liquid absorption plant and feed pipe one；The compressor one and urea liquid absorption plant
Bottom end is connected, and described one one end of fluid reservoir is connected with feed pipe one, one other end of fluid reservoir and urea liquid absorption plant
Top is connected；The heterogeneous class Fenton wet oxidation denitrating system of second level includes heterogeneous class Fenton oxidation absorption plant, pressure
Mechanism of qi two, fluid reservoir two and feed pipe two, the compressor two are connected with heterogeneous class Fenton oxidation absorption plant bottom end, institute
It states two one end of fluid reservoir to be connected with feed pipe two, two other end of fluid reservoir and heterogeneous class Fenton oxidation absorption plant top
It is connected；Urea liquid absorption plant top is connected with compressor two.
2. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 1
Be: the solution recycle system includes three-phase inversion valve, sulfite oxidation pond and crystallization apparatus；The urea liquid
Absorption plant bottom end is successively connected with crystallization apparatus, fluid reservoir one by sulfite oxidation pond；The heterogeneous class Fenton oxygen
Change absorption plant bottom end to be connected with three-phase inversion valve, three-phase inversion valve one end is connected with fluid reservoir two, the three-phase
The conversion valve other end is connected with sulfite oxidation pond.
3. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 2
It is: is equipped with metering pump three between the urea liquid absorption plant and sulfite oxidation pond.
4. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 2
It is: is equipped with metering pump five between the crystallization apparatus and fluid reservoir one.
5. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 2
It is: is equipped with metering pump four between the heterogeneous class Fenton oxidation absorption plant and three-phase inversion valve.
6. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 1
It is: is equipped with gas distributor one and demister one in the urea liquid absorption plant, the gas distributor one is arranged
In urea liquid absorption plant inside bottom, the demister one is arranged in urea liquid absorption plant inside top.
7. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 1
It is: is equipped with metering pump one between the fluid reservoir one and urea liquid absorption plant；The feed pipe one is equipped with valve one.
8. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 1
Be: be successively arranged from top to bottom on the inside of the heterogeneous class Fenton oxidation absorption plant gas distributor two, catalyst filling,
Liquid atomizing nozzle and demister two, the liquid atomizing nozzle are connected with fluid reservoir two.
9. heterogeneous class Fenton wet denitration device, feature are combined in a kind of urea wet desulphurization according to claim 1
It is: is equipped with metering pump two between the fluid reservoir two and heterogeneous class Fenton oxidation absorption plant；It is set on the feed pipe two
There is valve two.
10. a kind of oxygen for combining heterogeneous class Fenton wet denitration device using urea wet desulphurization described in claim 1-9
Change method of denitration, which is characterized in that steps are as follows:
Firstly, flue gas is passed through level-one urea liquid desulphurization system, urea liquid absorbs the sulfur dioxide in flue gas and is converted into
Sulphite, the flue gas after desulfurization enter the heterogeneous class Fenton wet oxidation denitrating system of second level through demister one, contain sulfurous
The urea liquid of hydrochlorate is sent into solution recycle system；In the heterogeneous class Fenton wet oxidation denitrating system of second level, flue gas and double
Oxygen aqueous solution is contacted in catalyst filling surface counter-current, the flue gas of generation is discharged after demister two, contains nitrous acid, nitric acid
Hydrogen peroxide solution is sent into solution recycle system；In solution recycle system, the heterogeneous class Fenton wet oxidation denitrating system of second level
The solution containing nitrous acid, nitric acid after middle reaction is respectively fed to sulfite oxidation pond and fluid reservoir through three-phase inversion valve
Two, the urea liquid containing sulphite after reacting in level-one urea liquid desulphurization system be sent into sulfite oxidation pond carry out it is anti-
Ying Hou, the solution after crystallized device reaction are passed through fluid reservoir one；
In the heterogeneous class Fenton wet oxidation denitrating system of second level, catalyst filling area load has ferriferous oxide catalysis
Agent；
In the level-one urea liquid desulphurization system and the heterogeneous class Fenton wet oxidation denitrating system of second level, reaction temperature is
20-80 DEG C, operating pressure 0-0.5MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910562804.3A CN110280129A (en) | 2019-06-26 | 2019-06-26 | A kind of heterogeneous class Fenton wet denitration device and method of urea wet desulphurization joint |
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|---|---|---|---|
| CN201910562804.3A CN110280129A (en) | 2019-06-26 | 2019-06-26 | A kind of heterogeneous class Fenton wet denitration device and method of urea wet desulphurization joint |
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| CN111036075A (en) * | 2019-12-30 | 2020-04-21 | 紫金铜业有限公司 | Method for treating high-concentration nitrogen oxide flue gas |
| CN112705027A (en) * | 2020-12-10 | 2021-04-27 | 杭州电子科技大学 | Heterogeneous Fenton reaction denitration device and method based on atomization and cooling |
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Application publication date: 20190927 |