CN110124497A - A kind of desulphurization denitration absorbent and application thereof - Google Patents
A kind of desulphurization denitration absorbent and application thereof Download PDFInfo
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- CN110124497A CN110124497A CN201910445805.XA CN201910445805A CN110124497A CN 110124497 A CN110124497 A CN 110124497A CN 201910445805 A CN201910445805 A CN 201910445805A CN 110124497 A CN110124497 A CN 110124497A
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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
- B01D53/502—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 solution or suspension
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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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The present invention provides a kind of desulphurization denitration absorbent and application thereof, the desulphurization denitration absorbent includes the basic component of 3-10% and the antioxidant of 3-8%, and surplus is water.The present invention makes the NO absorbed by basic component by adding antioxidant in desulphurization denitration absorbentXIt is reduced to N2, ensure that NOXGas-liquid mass transfer motive force, improve NOXAbsorption efficiency；Basic component and antioxidant cooperate, and basic component can be improved the stability of antioxidant, so that the desulphurization denitration absorbent be enable for a long time, steadily to absorb the NO in flue gasX, using the NO in desulphurization denitration absorbent counter-current absorption flue gas provided by the inventionX, NO when recycling 30minXRemoval rate be up to 98.7%；After recycling 4h, NOXRemoval rate still be able to reach 83.3%.
Description
Technical field
The invention belongs to environmental technology field, be related to a kind of absorbent more particularly to a kind of desulphurization denitration absorbent and its
Purposes.
Background technique
The SO largely discharged in industrial production2With NOXIt is one of the primary pollution source for causing China's atmosphere pollution, it is de- at present
The technology of sulphur denitration includes wet type desulfurizing technique and selective catalysis reducing process, but selective catalysis reducing process is not suitable for being sintered
Flue gas and furnace flue gas, treatment temperature fluctuation is big and easily causes the sintering flue gas of catalyst poisoning and the basic skills of furnace flue gas
For wet type desulfurizing.
NO in flue gas, especially steel works sintering flue gasXIt is mainly derived from the burning of fuel in sintering process, it is burned
The nitrogen oxides generated in journey is mainly NO and NO2, wherein the content of NO is insoluble in water, the NO of high-valence state in 95% or more, NO2
And N2O5Water-soluble formation HNO2And HNO3, NO is oxidized to NO2Or N2O5NO in flue gas can be improvedXWater solubility.
107051182 A of CN discloses a kind of method of nitrogen oxides in nitrogen oxides removal device and its removal air-flow,
Gas is contacted with solid absorbent in this method, and the residence time of gas is 3-30s, and solid absorbent is calcium, barium, magnesium or zinc
One of oxide, hydride or carbonate or a variety of mixing.But this method belongs to semidry method absorption technique, absorption efficiency
It is low, it is not suitable for the more gas of absorbing NOx content.
106345246 A of CN discloses a kind of methods and applications of abjection nitrogen oxides, passes through denitration liquid and reacts abjection Asia
Nitrate, wherein denitration liquid is the aqueous solution or ammonium salt of urea and inorganic acid and the aqueous solution of inorganic acid.This method and application are logical
It crosses and inorganic acid, urea or ammonium chloride is added in waste water, make Nitrite transformation N2、CO2, water and inorganic salts.But this method
Denitration is carried out under conditions of 0-15 DEG C, and denitration liquid is acid solution, denitration efficiency is lower.
1200681 A of CN discloses a kind of method for removing nitrogen oxides contained in air-flow, and the method uses two steps
Method removes the nitrogen oxides in gas, is absorbed using nitric acid solution or aqueous solution remove N first2Nitrogen oxides other than O, then leads to
Crossing thermal decomposition makes N2O is classified to be further reduced the content of nitrogen oxides, but method needs to consume a large amount of nitric acid, to equipment
It is more demanding.
103301731 A of CN discloses side that is a kind of while removing sulfur dioxide in oxygen, nitrogen oxides and elemental mercury
Method, which comprises the aqueous solution containing nickel nitrate, potassium metaperiodate and additive is made, be absorbed agent mother liquor；It will absorb
Agent mother liquor is diluted with water, and be absorbed agent.This method nickel nitrate and potassium metaperiodate utilize strong oxidizing property by the titanium dioxide in flue gas
Sulphur, nitrogen oxides and elemental mercury oxidation, generate sulfate radical, nitrate anion and ion state mercury, and sulfate radical and nitrate anion pass through ammonium hydroxide
Reactive absorption.
Ozone is a kind of strong oxidizer, and ozone denitration technology is acted on using the advanced oxidation of active group, can be easily
NO is oxidized to NO2、N2O3、N2O5Etc. high-valence states be easy to absorbed compound, be then absorbed in desulfurizing tower agent absorption.
101036851 A of CN discloses a kind of processing method and processing device of nox contained waste gas, for nitrogen oxides gives up
Gas is passed through in the oxidator of a nitrogen oxides, and oxidation reaction occurs with the ozone from ozone generator, and nitrogen oxides is complete
Portion is converted into nitrogen dioxide, is then absorbed using polyethylene glycol absorbing liquid to it, the poly- second two in polyethylene glycol absorbing liquid
Alcohol and NO2In conjunction with the new structure of generation to improve NO2Absorptivity, but the continuous action of absorbing liquid is poor, when using for a long time
Assimilation effect is bad.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of desulphurization denitration absorbent and its answer
With the desulphurization denitration absorbent can absorb the NO in flue gasX, and absorption efficiency is high, long action time.The desulfurization is de-
Nitre absorbent is used to can be improved the efficiency of desulphurization denitration when desulphurization denitration, and reduces the cost of desulphurization denitration.
To achieve this purpose, the present invention adopts the following technical scheme:
In a first aspect, being calculated in mass percent the present invention provides a kind of desulphurization denitration absorbent, the desulphurization denitration is inhaled
Receiving agent includes:
Basic component 3-10%
Antioxidant 3-8%
Surplus is water；
The antioxidant includes sodium thiosulfate and erythorbic acid sodium.
NO in flue gas, especially sintering flue gasXIt is mainly derived from the burning of fuel in sintering process, is produced in combustion process
Raw nitrogen oxides is mainly NO and NO2, the NO after oxidation processesXMainly by NO2、N2O3And N2O5Composition, NO2、N2O3With
And N2O5Solubility in water is higher, but the temperature of sintering flue gas is higher, at relatively high temperatures N2O3With N2O5It is higher in temperature
When can be decomposed into NO2, therefore the NO in oxidation-treated rear flue gasXPredominantly NO2。
And the desulphurization denitration absorbent of alkalinity being capable of NO in absorbing and removing flue gasXAnd sulfur dioxide.Basic component is inhaled
Sulphite is formed after receiving sulfur dioxide, and sulphite is by NOXIt is reduced to N2, to guarantee NO in flue gasXIt is absorbed to desulphurization denitration
The mass transfer force of agent mass transfer improves denitrification efficiency.But it carries out to keep away in the flue gas of oxidation processes using ozone oxidation
Exempt from there are excessive ozone, sulfite oxidation is sulfate by ozone, certainly will will affect sulphite to NOXGo back original work
With influencing desulphurization denitration absorbent to NOXRemoving.
The influence of ozone is reduced in desulphurization denitration absorbent of the present invention by addition antioxidant, it is described anti-oxidant
Agent includes sodium thiosulfate and erythorbic acid sodium.Ozone in flue gas is reacted with antioxidant first, then just can be with Asia
Sulfate is reacted, and sulphite is enable preferably to restore NOX.Erythorbic acid sodium is soluble in water to be easily oxidized, but and sulphur
Sodium thiosulfate cooperates, and antioxidant can be made with ozone stable to be combined, and guarantees sodium sulfite to NOXGo back original work
With.And the alkaline environment that provides of basic component can be improved the stability of sodium thiosulfate, basic component, sodium thiosulfate with
Erythorbic acid sodium cooperates, and improves the assimilation effect of gained desulphurization denitration absorbent jointly.
It being calculated in mass percent, the desulphurization denitration absorbent includes basic component 3-10%, such as can be 3%,
4%, 5%, 6%, 7%, 8%, 9% or 10%, preferably 5-8%, further preferably 6%；Antioxidant 3-8%, such as
It can be 3%, 4%, 5%, 6%, 7% or 8%, preferably 4-7%, further preferably 6%；Surplus is water.
Preferably, the basic component includes carbonate, bicarbonate, sulphite, urea, ammonium hydroxide, sodium hydroxide, hydrogen
In potassium oxide, magnesium hydroxide or calcium hydroxide any one or at least two combination, such as can be carbonate and sulfurous
The combination of the combination of the combination of the combination of hydrochlorate, bicarbonate and sulphite, sulphite and urea, urea and ammonium hydroxide, hydrogen
The combination of sodium oxide molybdena, potassium hydroxide and magnesium hydroxide, sulphite, urea, magnesium hydroxide and calcium hydroxide combination or carbonic acid
The combination of salt, sulphite, ammonium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide, preferably sodium hydroxide and sulphite
Combination.
Preferably, the carbonate includes any one in sodium carbonate, potassium carbonate, calcium carbonate or magnesium carbonate or at least two
The combination of kind.Typical but non-limiting combination includes the combination of sodium carbonate and potassium carbonate, the combination of potassium carbonate and calcium carbonate, carbon
The combination of the combination of sour calcium and magnesium carbonate, sodium carbonate and calcium carbonate, sodium carbonate, the combination of potassium carbonate and calcium carbonate or sodium carbonate,
The combination of potassium carbonate, calcium carbonate and magnesium carbonate.The preferably combination of calcium carbonate and magnesium carbonate.
Preferably, the mass ratio of the calcium carbonate and magnesium carbonate be (1-5): (1-5), for example, can be 1:1,1:2,1:3,
1:4,1:5,2:1,2:3,2:5,3:1,3:2,3:4,3:5,4:1,4:2,4:3,4:5,5:1,5:2,5:3 or 5:4.
Preferably, the bicarbonate includes sodium bicarbonate and/or saleratus.
Preferably, the sulphite includes sodium sulfite and/or potassium sulfite.Basic component absorbs the dioxy in flue gas
Changing sulphur will form certain sulphite, but the content of sulfur dioxide in flue gas is difficult to keep stable, at this time gained sulphite
Content be also difficult to stablize, influence sulphite reduction NOXStability, can be with by adding sulphite in basic component
Guarantee that sulphite restores NOXStability, guarantee desulphurization denitration absorbent desulphurization denitration when efficiency.
Preferably, the mass ratio of the sodium thiosulfate and erythorbic acid sodium is (1-5): (1-5), for example, can be 1:1,
1:2,1:3,1:4,1:5,2:1,2:3,2:5,3:1,3:2,3:4,3:5,4:1,4:2,4:3,4:5,5:1,5:2,5:3 or 5:4.
Second aspect, the present invention provides a kind of desulphurization denitration absorbents as described in relation to the first aspect for desulphurization denitration
Purposes.
Preferably, the purposes includes the following steps: that desulphurization denitration absorbent contacts absorption with flue gas adverse current.
Preferably, the flue gas is the flue gas after ozone oxidation, wherein NOXConcentration be 240-350mg/Nm3, such as
It can be 240mg/Nm3、250mg/Nm3、260mg/Nm3、270mg/Nm3、280mg/Nm3、290mg/Nm3、300mg/Nm3、
310mg/Nm3、320mg/Nm3、330mg/Nm3、340mg/Nm3Or 350mg/Nm3；SO2Concentration be 500mg/Nm3、600mg/
Nm3、700mg/Nm3、800mg/Nm3、900mg/Nm3、1000mg/Nm3、1100mg/Nm3、1200mg/Nm3、1300mg/Nm3、
1400mg/Nm3、1500mg/Nm3、1600mg/Nm3、1700mg/Nm3、1800mg/Nm3、1900mg/Nm3、2000mg/Nm3、
2100mg/Nm3、2200mg/Nm3、2300mg/Nm3Or 2400mg/Nm3。
Preferably, the liquid-gas ratio of the desulphurization denitration absorbent and flue gas is 8-12L/m3, such as can be 8L/m3、
8.5L/m3、9L/m3、9.5L/m3、10L/m3、10.5L/m3、11L/m3、11.5L/m3Or 12L/m3, preferably 9L/m3。
Specifically, flue gas desulfurization denitration dust-removing disclosed in 108554145 A of present invention application CN takes off the absorption in white device
Tower, using desulphurization denitration absorbent provided by the invention to the NO in the flue gas through ozone oxidationXIt is absorbed.NO at this timeXBy
NO2、N2O3And N2O5It forms, wherein NO2Content it is higher.Flue gas and desulphurization denitration absorbent counter current contacting, the NO in flue gasX
Denitration absorbent is desulfurized by gas-liquid mass transfer to absorb, and is reduced to N2。
Numberical range of the present invention not only includes enumerated point value, further includes the above-mentioned numerical value not included
Arbitrary point value between range, as space is limited and for concise consideration, range described in the present invention no longer exclusive list includes
Specific point value.
Compared with prior art, the invention has the benefit that
Desulphurization denitration absorbent provided by the invention includes basic component and antioxidant, and wherein antioxidant includes thio
Sodium sulphate and erythorbic acid sodium, form sulphite after basic component sulfur dioxide absorption, and sulphite is by NOXIt is reduced to N2, from
And guarantee NO in flue gasXTo the mass transfer force of desulphurization denitration absorbent mass transfer；
The addition of antioxidant inhibits ozone so that sulphite is preferably restored the oxidation of sulphite
NOX, erythorbic acid sodium is soluble in water to be easily oxidized, but is cooperated with sodium thiosulfate, and antioxidant can be made steady with ozone
Surely it is combined, guarantees sodium sulfite to NOXReduction.And the alkaline environment that basic component provides can be improved sulphur
The stability of sodium thiosulfate, basic component, sodium thiosulfate and erythorbic acid sodium cooperate, and it is de- to improve gained desulfurization jointly
The assimilation effect of nitre absorbent；
Using the NO in desulphurization denitration absorbent counter-current absorption flue gas provided by the inventionX, NO when recycling 30minXRemoval
Rate is up to 98.7%；After recycling 4h, NOXRemoval rate still be able to reach 83.3%.
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation.
Embodiment 1
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 2
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 3
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 4
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 5
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 6
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 7
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 8
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 9
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 10
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 11
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 12
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 13
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 14
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 15
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 16
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 17
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Embodiment 18
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Comparative example 1
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Comparative example 2
A kind of desulphurization denitration absorbent is present embodiments provided, composition is as shown in the table:
Comparative example 3
This comparative example provides a kind of desulphurization denitration absorbent, and composition is as shown in the table:
Comparative example 4
This comparative example provides a kind of desulphurization denitration absorbent, and composition is as shown in the table:
Comparative example 5
This comparative example provides a kind of desulphurization denitration absorbent, and composition is as shown in the table:
Comparative example 6
This comparative example provides a kind of desulphurization denitration absorbent, and composition is as shown in the table:
Comparative example 7
This comparative example provides a kind of desulphurization denitration absorbent, and composition is as shown in the table:
Comparative example 8
This comparative example provides a kind of desulphurization denitration absorbent, and composition is as shown in the table:
Disclosed in 108554145 A of CN in absorption tower, desulfurization that Application Example 1-18 and comparative example 1-8 are provided
NO in denitration absorbent counter-current absorption flue gasXWith SO2, the temperature of flue gas is 120 ± 5 DEG C, and the temperature of desulphurization denitration absorbent is
50 DEG C, the liquid-gas ratio of desulphurization denitration absorbent and flue gas is 9L/m3, 4 layers of spray desulphurization denitration absorbent of setting in absorption tower
Spraying layer, spray flow successively increase along gas flow direction, and the flow-rate ratio of adjacent two layers spraying layer is 2:1.Desulphurization denitration is inhaled
Agent is received to be recycled after 30min using TESTO350 flue gas analyzer to NO in absorption tower entrance and exit flue gasXAnd SO2
Concentration measure, measurement result is as shown in table 1.
Table 1
As shown in Table 1, the desulphurization denitration absorbent that embodiment 1-18 and comparative example 1-8 is provided is to SO in flue gas2Go
Except rate is 99.0% or more, it is little to illustrate that the removal rate of the pairs of sulfur dioxide in flue gas of the group of desulphurization denitration absorbent influences.
The desulphurization denitration absorbent that embodiment 1-13 is provided absorbs the NO in flue gasXWhen, the NO in flue gasXRemoval rate be
96%-98.7%.
The basic component in desulphurization denitration absorbent that embodiment 14 provides only is made of sodium hydroxide, although sodium hydroxide
It can be reacted with sulfur dioxide and generate sodium sulfite, but the content of sulfur dioxide in flue gas is limited, and the gas-liquid of sulfur dioxide
Mass transfer velocity also affects sodium sulfite to the reduction rate of nitrite, therefore the desulphurization denitration absorbent that embodiment 14 provides
Remove NO in flue gasXWhen, NOXRemoval rate be 93.5%, 98.7% when lower than Application Example 1.
The basic component in desulphurization denitration absorbent that embodiment 15 provides only is made of sodium sulfite, at this time desulphurization denitration
The alkalinity of absorbent is weaker than the desulphurization denitration absorbent of the offer of embodiment 1, and the antioxidant in desulphurization denitration absorbent is steady at this time
Qualitative difference, and NOXGas-liquid mass transfer motive force decline, influence NO in flue gasXRemoval rate, therefore embodiment 15 provide desulfurization
Denitration absorbent removes NO in flue gasXWhen, NOXRemoval rate be 92.2%, 98.7% when lower than Application Example 1.
The desulphurization denitration absorbent that embodiment 16-18 is provided is implemented compared with the desulphurization denitration absorbent that embodiment 1 provides
In basic component in example 16-18, sodium hydroxide, gained desulphurization denitration are replaced using sodium carbonate, calcium carbonate and magnesium carbonate respectively
The alkalinity of absorbent weakens, the stability decline of antioxidant, therefore the desulphurization denitration absorbent that Application Example 16-18 is provided
Remove the NO in flue gasXWhen, NOXRemoval rate be 91.5%, 93.3% and 91.4%, when lower than Application Example 1
98.7%.
The antioxidant in desulphurization denitration absorbent that comparative example 1 provides only is made of sodium thiosulfate, antioxidant
Antioxygenic property decline, part sodium sulfite are sodium sulphate by ozone oxidation, and influencing sodium sulfite for nitrate reductase is N2,
Therefore NO in the desulphurization denitration absorbent removal flue gas that comparative example 1 providesXWhen, NOXRemoval rate be 90.9%, it is real lower than application
Apply 98.7% when example 1.
The antioxidant in desulphurization denitration absorbent that comparative example 2 provides only is made of erythorbic acid sodium, erythorbic acid sodium
Unstable in alkaline solution, antioxygenic property decline, part sodium sulfite is sodium sulphate by ozone oxidation, influences sodium sulfite
It is N by nitrate reductase2, therefore the desulphurization denitration absorbent that comparative example 2 provides removes NO in flue gasXWhen, NOXRemoval rate
It is 90.5%, 98.7% when lower than Application Example 1.
The mass percentage for the basic component in desulphurization denitration absorbent that comparative example 3 provides is 1%, basic component
Content is lower, the NO in desulphurization denitration absorbent removal flue gas that Comparison study example 3 providesXWhen, NOXRemoval rate be 89.5%,
98.7% when far below Application Example 1, denitration effect is bad.
The mass percentage for the basic component in desulphurization denitration absorbent that comparative example 4 provides is 12%, basic component
Content it is higher, the erythorbic acid sodium in antioxidant can not effectively play antioxidation at this time, and Comparison study example 4 provides
Desulphurization denitration absorbent removal flue gas in NOXWhen, NOXRemoval rate be 94.6%, when lower than Application Example 1
98.7%, and the higher cost of sodium hydroxide, it is unfavorable for saving the cost of desulphurization denitration.
The mass percentage for the antioxidant in desulphurization denitration absorbent that comparative example 5 provides is 1%, and ozone is by antioxygen
It will continue to oxidative sodium after agent oxidation, influence reduction of the sodium sulfite to nitrite, therefore Comparison study example 5 provides
Desulphurization denitration absorbent absorb flue gas in NOXWhen, NOXRemoval rate be 95.5%, when lower than Application Example 1
98.7%.
The mass percentage for the antioxidant in desulphurization denitration absorbent that comparative example 6 provides is 10%, desulfurization at this time
The higher cost of denitration absorbent, the desulphurization denitration absorbent that Comparison study example 6 provides absorb the NO in flue gasXWhen, NOXGo
Except rate is 98.5%, slightly below Application Example 1 when 98.7%, but higher cost is unfavorable for industrialization promotion.
Only contain basic component in the desulphurization denitration absorbent that comparative example 7 provides, sodium sulfite is directly oxidized to by ozone
Sodium sulphate, therefore nitrate reductase can not be N by the desulphurization denitration absorbent that comparative example 7 provides2, therefore the efficiency of denitration compared with
Low, the desulphurization denitration absorbent that Comparison study example 7 provides absorbs the NO in flue gasXWhen, NOXRemoval rate be 93.5%, be far below
98.7% when Application Example 1, denitration effect is bad.
Only contain antioxidant in the desulphurization denitration absorbent that comparative example 8 provides, sodium thiosulfate is strong base-weak acid salt, is resisted
Alkalescent is presented in oxidant, and desulphurization denitration absorbent generates a small amount of sulphite, but number after absorbing the sulfur dioxide in flue gas
Measure limited, therefore the efficiency of denitration is lower, and the desulphurization denitration absorbent that Comparison study example 8 provides absorbs the NO in flue gasXWhen, NOX
Removal rate be 84.7%, 98.7% when far below Application Example 1, denitration effect is bad.
Desulphurization denitration absorbent is recycled after 4h using TESTO350 flue gas analyzer to absorption tower entrance and exit
NO in flue gasXAnd SO2Concentration measure, measurement result is as shown in table 2.
Table 2
As shown in Table 2, the desulphurization denitration absorbent that embodiment 1-18 and comparative example 1-8 is provided absorbs the SO in flue gas2
When, after 4h is recycled in desulphurization denitration absorbent, SO2Removal rate 97.0% or more, desulfurization effect is preferable, but denitration imitate
Fruit variation is obvious.
The antioxidant in desulphurization denitration absorbent that comparative example 1 provides only is made of sodium thiosulfate, and 4h is recycled
Afterwards, NOXRemoval rate drop to 81.6%, 83.3% when lower than Application Example 1.The desulphurization denitration that comparative example 2 provides is inhaled
The antioxidant received in agent is only made of erythorbic acid sodium, after 4h is recycled, NOXRemoval rate drop to 79.1%, be lower than
83.3% when Application Example 1.
The content for the antioxidant in desulphurization denitration absorbent that comparative example 5 provides is 1%, the content of antioxidant compared with
It is few, after 4h is recycled, NOXRemoval rate drop to 67.5%, 83.3% when lower than Application Example 1.Comparative example 7 provides
Desulphurization denitration absorbent in only contain basic component, do not contain antioxidant, be recycled 4h after, NOXRemoval rate decline
To 56.5%, when far below Application Example 1 83.3%, the duration of denitration is bad.
Only contain antioxidant in the desulphurization denitration absorbent that comparative example 8 provides, it is most of anti-oxidant after 4h is recycled
Agent is by ozone oxidation, and the sulphite that sulfur dioxide absorption generates can not cooperate with antioxidant, and Comparison study example 8 provides
Desulphurization denitration absorbent absorb flue gas in NOXWhen, NOXRemoval rate drop to 63.2%, be far below Application Example 1 when
83.3%.
In conclusion desulphurization denitration absorbent provided by the invention includes basic component and antioxidant, wherein anti-oxidant
Agent includes sodium thiosulfate and erythorbic acid sodium, forms sulphite after basic component sulfur dioxide absorption, and sulphite is by NOX
It is reduced to N2, to guarantee NO in flue gasXTo the mass transfer force of desulphurization denitration absorbent mass transfer；The addition of antioxidant inhibits
Oxidation of the ozone to sulphite, enables sulphite preferably to restore NOX, erythorbic acid sodium easily quilt soluble in water
Oxidation, but cooperate with sodium thiosulfate, antioxidant can be made with ozone stable to be combined, guarantee sodium sulfite pair
NOXReduction.And the alkaline environment that provides of basic component can be improved the stability of sodium thiosulfate, basic component,
Sodium thiosulfate and erythorbic acid sodium cooperate, and improve the assimilation effect of gained desulphurization denitration absorbent jointly.
Using the NO in desulphurization denitration absorbent counter-current absorption flue gas provided by the inventionX, NO when recycling 30minXRemoval
Rate is up to 98.7%；After recycling 4h, NOXRemoval rate still be able to reach 83.3%.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of desulphurization denitration absorbent, which is characterized in that be calculated in mass percent, the desulphurization denitration absorbent includes:
Basic component 3-10%
Antioxidant 3-8%
Surplus is water；
The antioxidant includes sodium thiosulfate and erythorbic acid sodium.
2. desulphurization denitration absorbent according to claim 1, which is characterized in that be calculated in mass percent, the desulfurization is de-
Nitre absorbent includes:
Basic component 5-8%
Antioxidant 4-7%
Surplus is water.
3. desulphurization denitration absorbent according to claim 1 or 2, which is characterized in that be calculated in mass percent, the desulfurization
Denitration absorbent includes:
Basic component 6%
Antioxidant 6%
Surplus is water.
4. desulphurization denitration absorbent according to claim 1-3, which is characterized in that the basic component includes carbon
It is any in hydrochlorate, bicarbonate, sulphite, urea, ammonium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide or calcium hydroxide
It is a kind of or at least two combination, the preferably combination of sodium hydroxide and sulphite.
5. desulphurization denitration absorbent according to claim 4, which is characterized in that the carbonate includes sodium carbonate, carbonic acid
In potassium, calcium carbonate or magnesium carbonate any one or at least two combination.
6. desulphurization denitration absorbent according to claim 4, which is characterized in that the bicarbonate includes sodium bicarbonate
And/or saleratus.
7. desulphurization denitration absorbent according to claim 4, which is characterized in that the sulphite includes sodium sulfite
And/or potassium sulfite.
8. desulphurization denitration absorbent according to claim 1-7, which is characterized in that the sodium thiosulfate with it is red
The mass ratio of algae sodium saccharate is (1-5): (1-5).
9. a kind of purposes for being used for desulphurization denitration such as the described in any item desulphurization denitration absorbents of claim 1-8.
10. purposes according to claim 9, which is characterized in that the purposes includes the following steps: desulphurization denitration absorbent
Absorption is contacted with flue gas adverse current；
Preferably, the flue gas is the flue gas after ozone oxidation, wherein NOXConcentration be 240-350mg/Nm3, SO2Concentration
For 500-2400mg/Nm3；
Preferably, the liquid-gas ratio of the desulphurization denitration absorbent and flue gas is 8-12L/m3, preferably 9L/m3。
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| WO2023129935A1 (en) * | 2021-12-29 | 2023-07-06 | Pentair, Inc. | System and a method for reducing nitrogen dioxide (no 2) content in flue gas |
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