CN109200807A - A kind of method of denitration of desulfurization fume - Google Patents
A kind of method of denitration of desulfurization fume Download PDFInfo
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- CN109200807A CN109200807A CN201811072562.1A CN201811072562A CN109200807A CN 109200807 A CN109200807 A CN 109200807A CN 201811072562 A CN201811072562 A CN 201811072562A CN 109200807 A CN109200807 A CN 109200807A
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- denitration
- desulfurization fume
- desulfurization
- flue gas
- aqueous solution
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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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/70—Non-metallic catalysts, additives or dopants
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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 relates to fume treatment technical fields, and in particular to a kind of method of denitration of desulfurization fume, this method, which refers to, is delivered to the flue gas after desulfurization in denitrating tower by smoke conveying duct, absorbs the nitrogen oxides in flue gas with the absorbent containing catalyst component.Using processing method of the invention, denitration cost can be reduced, denitration efficiency is substantially increased, is generated in denitrification process without waste liquid, realize green denitration.
Description
Technical field
The present invention relates to fume treatment technical fields, and in particular to a kind of method of denitration of desulfurization fume.
Background technique
SO2It is the principal element to form acid rain and photochemical fog, destroy ozone layer, cause greenhouse effects with NOx, seriously
Threaten the life security of ecological environment and the mankind.Therefore it adopts an effective measure and coal-fired flue-gas control and improvement is had become both at home and abroad
The hot spot of energy environment protection area research.NO accounts for the 90% of nitrogen oxides in effluent content, is insoluble in water and lye, wet
It is difficult to remove simultaneously in method sweetening process.
China mainly uses wet desulphurization at present, removes NOx in conjunction with selective catalytic reduction (SCR).SCR method denitration
Rate is up to 90%, the disadvantage is that need to introduce catalyst from foreign countries, it is expensive；Process needs ammonia to make reducing agent, and ammonia is not easy to store,
It is easy to cause secondary pollution；Also there is research to carry out gaseous oxidation using ozone, hydrogen peroxide etc., NO is oxidized to NO2, then with having
Solvent complexed absorption carries out neutralization reaction with ammonium hydroxide again, generates nitrate and makees fertilizer, can achieve higher removal effect, but
It is that can increase considerably operating cost, and ammonium hydroxide has corrosivity to equipment, causes environmental pollution in case of leakage, it is furthermore secondary
The problems such as product chemical fertilizer added value is not high.
Summary of the invention
It is an object of the invention to be: in view of the deficienciess of the prior art, provide it is a kind of reduce cost, safe operation,
The method of denitration of the desulfurization fume of denitration efficiency can be improved.
To achieve the goals above, the technical scheme is that
A kind of method of denitration of desulfurization fume, the method, which refers to, conveys the flue gas after desulfurization by smoke conveying duct
Into denitrating tower, the nitrogen oxides in flue gas is absorbed with the absorbent containing catalyst component.
As an improvement technical solution, the catalyst component contained in the absorbent is organic sulfoxide, the absorption
Remaining group of agent is divided into the acidic aqueous solution of manganese dioxide, and wherein acidic aqueous solution is aqueous solution of nitric acid.
As an improvement technical solution, the concentration of nitric acid is 4%-8% in the aqueous solution of nitric acid, and every 1L nitric acid
Contain manganese dioxide 8-15g in aqueous solution, contains organic sulfoxide 150-300g.
As an improvement technical solution, gas flow when desulfurization fume enters denitrating tower is 8-15L/min, O2Body
Fraction is 5-8%, liquid-gas ratio 8-12L/m3, desulfurization fume temperature be 135-145 DEG C.
As an improvement technical solution, product of the flue gas after denitrating tower denitration enter separator, and separation is received
The organic sulfoxide of collection is reused in denitration reaction, and the denitration product a part separated and collected is used for the preparation of desulfurizing agent, a part
Into thermal decomposer.
As an improvement technical solution, the denitration product a part separated and collected enters thermal decomposer, through overheating
The manganese dioxide collected after decomposition is reused for denitration reaction, and the nitrogen dioxide of collection enters in smoke conveying duct.
The invention adopts the above technical scheme, has the advantage that compared with prior art
(1) present invention carries out denitration process to the flue gas after desulfurization, using the absorbent containing catalyst component to flue gas
In nitrogen oxides absorbed, nitrogen oxides reacted with water generate nitrous acid be easy to happen since nitrous Acidity is unstable
Decomposing, catalyst component be added in absorbent ----organic sulfoxide, nitrous acid molecule is first in conjunction with organic sulfoxide, due to dioxy
The oxidizing potential for changing manganese is better than nitrous acid, and the nitrous acid molecule in conjunction with organic sulfoxide is oxidized to nitric acid, loses nitrous acid molecule
Organic sulfoxide recombine not oxidized nitrous acid molecule again, avoid the decomposition of nitrous acid molecule；Using above-mentioned absorbent
To carry out denitration process to desulfurization fume, substantially increases denitration efficiency；
(2) for the present invention when carrying out denitration process to desulfurization fume, the concentration of nitric acid is 4%- in the absorbent that uses
8%, and contain manganese dioxide 8-15g in every 1L aqueous solution of nitric acid, contain organic sulfoxide 150-300g；Desulfurization fume enters denitrating tower
When gas flow be 8-15L/min, O2Volume fraction is 5-8%, liquid-gas ratio 8-12L/m3, desulfurization fume temperature be
135-145℃.Denitration efficiency may be up to 92.5% under this technological parameter；
(3) method of denitration in the present invention, whole process are not necessarily to adding raw materials, and no waste liquid generates, and only introduce recyclable make
Organic sulfoxide and manganese dioxide, so that it may the smooth operation for realizing entire technique, is a kind of denitrating technique means of efficient green,
Product manganese nitrate a part after denitration prepares nitrogen dioxide and manganese dioxide for cyclic absorption, a part for thermal decomposition
It can be used for the preparation of desulfurizing agent.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is carried out further detailed
Explanation.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Embodiment 1
A kind of method of denitration of desulfurization fume, this method, which refers to, is delivered to the flue gas after desulfurization by smoke conveying duct
In denitrating tower, with absorbent, (concentration of nitric acid is 4% in absorbent, and contains manganese dioxide 8g in every 1L aqueous solution of nitric acid, is contained
Have organic sulfoxide 150g) absorb flue gas in nitrogen oxides；Gas flow when wherein desulfurization fume enters denitrating tower be 8L/min,
The temperature of desulfurization fume is 135 DEG C, O2Volume fraction is 5%, liquid-gas ratio 8L/m3.Desulfurization fume after absorbent absorbs,
Denitration product (manganese nitrate) and catalyst organic sulfoxide enter separator (whizzer) together, organic by what is separated and collected
Sulfone is reused in denitration reaction, and denitration product (manganese nitrate) a part separated and collected is used for the preparation of desulfurizing agent, a part
Denitration product (manganese nitrate) enters thermal decomposer, and (thermal decomposer includes hothouse, and the inner upper of hothouse is equipped with nitric acid
The lower inside of manganese solution atomizer, hothouse is equipped with steam pipeline, and manganese nitrate solution is after atomizer is atomized, with steam
Steam contact in delivery pipe, manganese nitrate resolves into manganese dioxide and nitrogen dioxide under the action of hot steam, manganese dioxide and
Nitrogen dioxide enters cyclone separator from the discharge port of hothouse bottom, by the separation of cyclone separator, the titanium dioxide of collection
Manganese particle recycles, and as the absorber component of nitrogen oxides, the nitrogen dioxide of collection, which enters in smoke conveying duct, to be used for
The ratio for adjusting the nitrogen oxides in flue gas, so that in flue gas 35%) oxidizability maintains.
Embodiment 2
A kind of method of denitration of desulfurization fume, this method, which refers to, is delivered to the flue gas after desulfurization by smoke conveying duct
In denitrating tower, with absorbent (in absorbent the concentration of nitric acid be 6%, and in every 1L aqueous solution of nitric acid contain manganese dioxide 12g,
The nitrogen oxides in flue gas is absorbed containing organic sulfoxide 260g)；Gas flow when wherein desulfurization fume enters denitrating tower is 12L/
min、O2Volume fraction is 6%, liquid-gas ratio 10L/m3, desulfurization fume temperature be 140 DEG C；Desulfurization fume is inhaled by absorbent
After receipts, denitration product (manganese nitrate) and catalyst organic sulfoxide enter separator (whizzer) together, by separating and collecting
Organic sulfoxide be reused in denitration reaction, the denitration product (manganese nitrate) that separates and collects a part is used for the preparation of desulfurizing agent,
A part of denitration product (manganese nitrate) enters thermal decomposer, and (thermal decomposer includes hothouse, and the inner upper of hothouse is set
Have a manganese nitrate solution atomizer, the lower inside of hothouse is equipped with steam pipeline, manganese nitrate solution after atomizer is atomized,
It is contacted with the steam in steam pipeline, manganese nitrate resolves into manganese dioxide and nitrogen dioxide, dioxy under the action of hot steam
Change manganese and nitrogen dioxide and enters cyclone separator from the discharge port of hothouse bottom, by the separation of cyclone separator, collection
Manganese dioxide particle recycles, and as the absorber component of nitrogen oxides, the nitrogen dioxide of collection enters smoke conveying duct
In for adjusting the ratio of nitrogen oxides in flue gas so that in flue gas 40%) oxidizability maintains.
Embodiment 3
A kind of method of denitration of desulfurization fume, this method, which refers to, is delivered to the flue gas after desulfurization by smoke conveying duct
In denitrating tower, with absorbent (in absorbent the concentration of nitric acid be 8%, and in every 1L aqueous solution of nitric acid contain manganese dioxide 15g,
The nitrogen oxides in flue gas is absorbed containing organic sulfoxide 300g)；Gas flow when wherein desulfurization fume enters denitrating tower is 15L/
min、O2Volume fraction is 8%, liquid-gas ratio 12L/m3, desulfurization fume temperature be 145 DEG C；Desulfurization fume is inhaled by absorbent
After receipts, denitration product (manganese nitrate) and catalyst organic sulfoxide enter separator (whizzer) together, by separating and collecting
Organic sulfoxide be reused in denitration reaction, the denitration product (manganese nitrate) that separates and collects a part is used for the preparation of desulfurizing agent,
A part of denitration product (manganese nitrate) enters thermal decomposer, and (thermal decomposer includes hothouse, and the inner upper of hothouse is set
Have a manganese nitrate solution atomizer, the lower inside of hothouse is equipped with steam pipeline, manganese nitrate solution after atomizer is atomized,
It is contacted with the steam in steam pipeline, manganese nitrate resolves into manganese dioxide and nitrogen dioxide, dioxy under the action of hot steam
Change manganese and nitrogen dioxide and enters cyclone separator from the discharge port of hothouse bottom, by the separation of cyclone separator, collection
Manganese dioxide particle recycles, and as the absorber component of nitrogen oxides, the nitrogen dioxide of collection enters smoke conveying duct
In for adjusting the ratio of nitrogen oxides in flue gas so that in flue gas 42%) oxidizability maintains.
In order to more preferably prove that processing method of the invention has preferable effect, the present invention is also made that several comparative examples.
Denitration efficiency in above-described embodiment 1-3 and comparative example the results are shown in Table 1.
Comparative example 1
Unlike the operation of embodiment 2, without containing catalyst component ----organic sulfoxide in absorbent, only with containing two
The acidic aqueous solution of manganese oxide, other operations are identical.
Comparative example 2
Unlike the operation of embodiment 2, denitration process, liquid-gas ratio 6L/m are carried out to desulfurization fume3, other operation phases
Together.
Table 1
| Embodiment | Denitration efficiency |
| Embodiment 1 | 89.8% |
| Embodiment 2 | 92.5% |
| Embodiment 3 | 91.2% |
| Comparative example 1 | 83.5% |
| Comparative example 2 | 86.7% |
By 1 data of table, it can be concluded that, method of denitration embodiment 1-3 of the invention is compared with comparative example 1 with 2, denitration
Efficiency is apparently higher than the denitration efficiency of comparative example 1 and comparative example 2.Therefore the method for denitration in the present invention can be preferably to desulfurization cigarette
The nitrogen oxides of gas is effectively removed, at low cost, and is generated without waste liquid, is a kind of denitration means of efficient green.
This patent is not limited to above-mentioned specific embodiment, those skilled in the art from the above idea,
Without creative labor, made various transformation are all fallen within the protection scope of this patent.
Claims (6)
1. a kind of method of denitration of desulfurization fume, it is characterised in that: the method refers to the flue gas after desulfurization is defeated by flue gas
It send pipeline into denitrating tower, absorbs the nitrogen oxides in flue gas with the absorbent containing catalyst component.
2. a kind of method of denitration of desulfurization fume according to claim 1, it is characterised in that: contain in the absorbent
Catalyst component is organic sulfoxide, remaining group of the absorbent is divided into manganese dioxide acidic aqueous solution, and wherein acidic aqueous solution is
Aqueous solution of nitric acid.
3. a kind of method of denitration of desulfurization fume according to claim 1, it is characterised in that: nitre in the aqueous solution of nitric acid
The concentration of acid is 4%-8%, and contains manganese dioxide 8-15g in every 1L aqueous solution of nitric acid, contains organic sulfoxide 150-300g.
4. a kind of method of denitration of desulfurization fume according to claim 1, it is characterised in that: desulfurization fume enters denitrating tower
When gas flow be 8-15L/min, O2Volume fraction is 5-8%, liquid-gas ratio 8-12L/m3, desulfurization fume temperature be
135-145℃。
5. a kind of method of denitration of desulfurization fume according to claim 1, it is characterised in that: flue gas passes through denitrating tower denitration
Product afterwards enters separator, and the organic sulfoxide separated and collected is reused in denitration reaction, the denitration product one separated and collected
Part is used for the preparation of desulfurizing agent, and a part enters thermal decomposer.
6. a kind of method of denitration of desulfurization fume according to claim 1, it is characterised in that: the denitration product separated and collected
A part enters thermal decomposer, and the manganese dioxide collected after thermal decomposition is reused for denitration reaction, the titanium dioxide of collection
Nitrogen enters in smoke conveying duct.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6881243B1 (en) * | 1999-10-12 | 2005-04-19 | Lextran Ltd. | Method for removing acidic gases from waste gas |
| CN104190235A (en) * | 2014-07-25 | 2014-12-10 | 浙江天蓝环保技术股份有限公司 | Regenerable oily denitration absorption liquid used for absorbing nitric oxides in smoke as well as preparation method and application of absorption liquid |
| CN105771652A (en) * | 2016-04-22 | 2016-07-20 | 青岛科技大学 | Flue gas denitration method by taking manganese oxide as cyclic absorption medium |
| CN107715670A (en) * | 2017-11-16 | 2018-02-23 | 北京国电龙源环保工程有限公司 | A kind of method of flue gas desulfurization collaboration denitration by-product HAS |
-
2018
- 2018-09-14 CN CN201811072562.1A patent/CN109200807A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6881243B1 (en) * | 1999-10-12 | 2005-04-19 | Lextran Ltd. | Method for removing acidic gases from waste gas |
| CN104190235A (en) * | 2014-07-25 | 2014-12-10 | 浙江天蓝环保技术股份有限公司 | Regenerable oily denitration absorption liquid used for absorbing nitric oxides in smoke as well as preparation method and application of absorption liquid |
| CN105771652A (en) * | 2016-04-22 | 2016-07-20 | 青岛科技大学 | Flue gas denitration method by taking manganese oxide as cyclic absorption medium |
| CN107715670A (en) * | 2017-11-16 | 2018-02-23 | 北京国电龙源环保工程有限公司 | A kind of method of flue gas desulfurization collaboration denitration by-product HAS |
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Application publication date: 20190115 |