CN103357260A - Flue gas desulfurization-denitration integrated process for strengthening urea by applying ferrous complexing agent - Google Patents
Flue gas desulfurization-denitration integrated process for strengthening urea by applying ferrous complexing agent Download PDFInfo
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- CN103357260A CN103357260A CN2012101005802A CN201210100580A CN103357260A CN 103357260 A CN103357260 A CN 103357260A CN 2012101005802 A CN2012101005802 A CN 2012101005802A CN 201210100580 A CN201210100580 A CN 201210100580A CN 103357260 A CN103357260 A CN 103357260A
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- flue gas
- urea
- complexing agent
- desulfurization
- edta
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a flue gas desulfurization-denitration integrated process for strengthening urea by applying ferrous complexing agent, which belongs to flue gas purifying treatment technology. The flue gas desulfurization-denitration integrated process comprises the following steps of: enabling the flue gas to enter an absorption tower after removing dust for sufficiently contacting with an absorption liquid mixture containing urea and ferrous complexing agent Fe (II) EDTA (Ethylene Diamine Tetraacetic Acid) in an absorption tower reaction region; absorbing the SO2 and NOx in the flue gas; and exhausting the purified flue gas into the atmosphere after removing the liquid drops in the flue gas by a demister. The absorption liquid preparation method disclosed by the invention is simple and easy to implement, capable of achieving a better purifying effect by only needing a set of absorbing devices, simple in structure, convenient to operate, small in floor area and easy to popularize. The process disclosed by the invention is adopted for treating the flue gas, so that the desulfurization rate can reach 95% or higher and the denitration rate can reach 75% or higher. Moreover, the process is further adaptable for modifying the existing flue gas desulfurization system, so that the desulfurization-denitration integrating purpose is achieved.
Description
Technical field
The present invention relates to the air pollution control technique field, be specifically related to a kind of flue gas desulfurization and denitrification integral process that ferrous complexing agent strengthens urea of using.
Background technology
China is one of a few country take coal as main energy sources in the world, the coal-fired SO that produces
2With the pernicious gas such as NOx atmospheric environment is caused serious pollution, therefore country is to SO
2Increasing with the control management of NOx.For flue gas desulfurization technique, being applied in of wet desulphurization accounts for more than 80% in the world, in wet desulphurization again take limestone-gypsum method as main.The advantage of limestone-gypsum method is that technical maturity, desulfuration efficiency are high, but also has the easy fouling of equipment, obstruction, causes the problems such as system can't move.For gas denitrifying technology, using more is selective catalytic reduction (SCR), and SCR technology denitration rate is high, but catalyst poisons easily, and operating cost is high.
Being used for flue gas desulfurization and denitration technique and the equipment overwhelming majority at present is independent exploitation, forms separately technical system and technological process.For meet the requirement of environmental protection, remove the SO in the flue gas
2And NOx, need at least two to overlap independently desulfurization and denitrating system.Present denitration device is installed in after the flue gas desulfurization mostly, and namely flue gas is first through carrying out denitration again after the desulfurization.The shortcomings such as this substep desulfurizing and denitrifying process exists that equipment is complicated, floor space large, operation and investment cost height, the advantage such as desulfurization and denitrification integral process is few with its counter investment, technique is simple more and more comes into one's own.Consider to be connected with the transformation of existing wet desulfurizing process, introduce the flue gas desulfurization and denitrification integral process that ferrous complexing agent strengthens urea, make original wet desulfurization system have the simultaneously function of desulphurization denitration, thereby form the desulfurization and denitrification integral process of small investment, low, the suitable China's national situation of operating cost.
Summary of the invention
Purpose of the present invention is exactly in order to solve the deficiencies in the prior art, and a kind of flue gas desulfurization and denitrification integral process that ferrous complexing agent strengthens urea of using is provided.
Purpose of the present invention is achieved through the following technical solutions:
A kind of flue gas desulfurization and denitrification integral process of using ferrous complexing agent enhancing urea: the method is for absorbing the SO in the flue gas by absorption liquid
2And NOx, pending flue gas enters the absorption tower and fully contacts with absorption liquid, the SO in the flue gas
2Be absorbed the after-purification discharging with NOx, described absorption liquid is formulated by urea, ferrous complexing agent Fe (II) EDTA and NaOH.Wherein ferrous complexing agent Fe (II) EDTA selects FeSO
47H
2O and Na
2The EDTA preparation.
The various absorption towers such as rotating stream tray scrubber, spray column, liquid column tower, bubble tower can be selected in above-mentioned absorption tower.
Realize purpose of the present invention for better, the absorption liquid of described configuration, the mass percentage content of urea is preferred 1～20%, FeSO
4With Na
2Preferred 0.005～the 0.1mol/L of the molar concentration of EDTA, FeSO
4With Na
2Preferred 0.005～the 0.1mol/L of molar concentration of Fe (II) EDTA that EDTA forms, absorption liquid pH value preferred 7.0～9.0.
The present invention adopts urea and ferrous complexing agent simultaneously desulphurization denitration, wherein urea and SO
2Reaction generates ammonium sulfite and ammonium sulfate, generates N with the NOx reaction
2, but the oxidizability of NOx is very low in the actual flue gas, and NO content accounts for more than 90% of NOx, uses separately urea to be difficult to the denitration efficiency that reaches higher, therefore adds ferrous complexing agent and improves denitration efficiency.Fe (II) EDTA and NO reaction generate Fe (II) EDTA (NO), Fe (II) EDTA (NO) and SO
3 2-And HSO
3 -Reacting generating salt, dithionate, N
2Deng, discharge simultaneously Fe (II) EDTA, react with NO again.If use separately Fe (II) EDTA to carry out denitration, owing to contain certain density O in the flue gas
2, then Fe (II) EDTA is oxidized to Fe (III) EDTA easily, and Fe (III) EDTA there is no the ability of complexing NO, can cause like this decline of denitration rate, uses urea and Fe (II) EDTA mixed liquor then can address this problem.Urea and SO
2The SO that reaction generates
3 2-Can suppress the oxidation of Fe (II) EDTA, again can regeneration Fe (II) EDTA, the product that final reaction generates can be made into the fertile and iron fertilizer of ammonium and sells, and recycles and is worth height.
Compared with prior art, the present invention has following advantage:
(1) the present invention is integrated into a complete process system with flue gas desulfurization, denitrating technique, has simplified technological process, reduces occupation area of equipment, reduces equipment investment and operating cost.
(2) ferrous complexing agent reproducible utilization only needs to replenish a little loss amount and gets final product.
(3) by-product utilized is worth height, and denitrification efficiency is high, and desulfurization degree reaches more than 95%, and the denitration rate reaches more than 75%, and without the equipment clogging.
Description of drawings
Accompanying drawing is process chart of the present invention.
The specific embodiment
By flue gas desulfurization and denitrification integral process shown in the drawings, preparation contains certain density urea and the fresh absorption liquid of ferrous complexing agent is stored in the dosing pond, extract the certain quantity of fresh absorption liquid in the absorption liquid circulatory pool, squeeze in the absorption tower and flue gas haptoreaction, the SO in the flue gas through circulating pump
2Be absorbed rear discharging that purify with NOx, process the recycling accessory substance after the absorption liquid discharging of part circulation.
Embodiment 1:
Simulated flue gas: flue gas flow 34L/min, temperature 70 C, time of staying 3s, SO
2Concentration 1500ppm, NO concentration 800ppm, all the other are air, liquid-gas ratio 10L/m
3
Absorption liquid: urea quality percent concentration 1%, Fe (II) EDTA concentration 0.005mol/L, pH=7.0.
Method and detection: liquid column tower diameter 60mm, high 800mm, simulated flue gas enters the absorption tower at the bottom of tower, contact with the absorption liquid that sprays straight up to react, and uses smoke gas on-line monitor to detect SO in inlet flue gas and the outlet flue gas
2Concentration with NO.Testing result shows that desulfurization degree is that desulfurization degree reaches more than 95%, and the denitration rate reaches 75%～87%.
Embodiment 2:
Simulated flue gas: flue gas flow 34L/min, temperature 70 C, time of staying 3s, SO
2Concentration 1500ppm, NO concentration 800ppm, all the other are air, liquid-gas ratio 10L/m
3
Absorption liquid: urea quality percent concentration 5%, Fe (II) EDTA concentration 0.01mol/L, pH=7.0.
Method and detection: liquid column tower diameter 60mm, high 800mm, simulated flue gas enters the absorption tower at the bottom of tower, contact with the absorption liquid that sprays straight up to react, and uses smoke gas on-line monitor to detect SO in inlet flue gas and the outlet flue gas
2Concentration with NO.Testing result shows that desulfurization degree is that desulfurization degree reaches more than 95%, and the denitration rate reaches 78%～90%.
Embodiment 3:
Simulated flue gas: flue gas flow 34L/min, temperature 70 C, time of staying 3s, SO
2Concentration 1500ppm, NO concentration 800ppm, all the other are air, liquid-gas ratio 10L/m
3
Absorption liquid: urea quality percent concentration 10%, Fe (II) EDTA concentration 0.05mol/L, pH=8.0.
Method and detection: liquid column tower diameter 60mm, high 800mm, simulated flue gas enters the absorption tower at the bottom of tower, contact with the absorption liquid that sprays straight up to react, and uses smoke gas on-line monitor to detect SO in inlet flue gas and the outlet flue gas
2Concentration with NO.Testing result shows that desulfurization degree is that desulfurization degree reaches more than 95%, and the denitration rate reaches 82%～94%.
Embodiment 4:
Simulated flue gas: flue gas flow 34L/min, temperature 70 C, time of staying 3s, SO
2Concentration 1500ppm, NO concentration 800ppm, all the other are air, liquid-gas ratio 10L/m
3
Absorption liquid: urea quality percent concentration 15%, Fe (II) EDTA concentration 0.01mol/L, pH=9.0.
Method and detection: liquid column tower diameter 60mm, high 800mm, simulated flue gas enters the absorption tower at the bottom of tower, contact with the absorption liquid that sprays straight up to react, and uses smoke gas on-line monitor to detect SO in inlet flue gas and the outlet flue gas
2Concentration with NO.Testing result shows that desulfurization degree is that desulfurization degree reaches more than 95%, and the denitration rate reaches more than 90%.
Embodiment 5:
Simulated flue gas: flue gas flow 34L/min, temperature 70 C, time of staying 3s, SO
2Concentration 1500ppm, NO concentration 800ppm, all the other are air, liquid-gas ratio 10L/m
3
Absorption liquid: urea quality percent concentration 20%, Fe (II) EDTA concentration 0.01mol/L, pH=7.0.
Method and detection: liquid column tower diameter 60mm, high 800mm, simulated flue gas enters the absorption tower at the bottom of tower, contact with the absorption liquid that sprays straight up to react, and uses smoke gas on-line monitor to detect SO in inlet flue gas and the outlet flue gas
2Concentration with NO.Testing result shows that desulfurization degree is that desulfurization degree reaches more than 95%, and the denitration rate reaches more than 92%.
Embodiment 6:
Simulated flue gas: flue gas flow 34L/min, temperature 70 C, time of staying 3s, SO
2Concentration 1200ppm, NO concentration 600ppm, all the other are air, liquid-gas ratio 15L/m
3
Absorption liquid: urea quality percent concentration 10%, Fe (II) EDTA concentration 0.01mol/L, pH=8.0.
Method and detection: liquid column tower diameter 60mm, high 800mm, simulated flue gas enters the absorption tower at the bottom of tower, contact with the absorption liquid that sprays straight up to react, and uses smoke gas on-line monitor to detect SO in inlet flue gas and the outlet flue gas
2Concentration with NO.Testing result shows that desulfurization degree is that desulfurization degree reaches more than 95%, and the denitration rate reaches more than 90%.
Above-described embodiment is the better embodiment of the present invention, but embodiments of the present invention are not restricted to the described embodiments, and other are any not to deviate from the change of doing under the principle of the invention, all should be the substitute mode of equivalence, all within protection scope of the present invention.
Claims (3)
1. use the flue gas desulfurization and denitrification integral process that ferrous complexing agent strengthens urea for one kind, pending flue gas enters the absorption tower, fully contacts the SO in the flue gas with absorption liquid
2Be absorbed the after-purification discharging with NOx, it is characterized in that: described absorption liquid is formulated by urea, ferrous complexing agent Fe (II) EDTA and NaOH.
2. the ferrous complexing agent of application according to claim 1 strengthens the flue gas desulfurization and denitrification integral process of urea, it is characterized in that: contain mass percentage content in the described absorption liquid and be 1～20% urea, molar concentration is ferrous complexing agent Fe (II) EDTA of 0.005～0.1mol/L, and the addition of NaOH is 7.0～9.0 for making the absorption liquid pH value.
3. the ferrous complexing agent of application according to claim 1 and 2 strengthens the flue gas desulfurization and denitrification integral process of urea, it is characterized in that: described ferrous complexing agent Fe (II) EDTA such as selects at the inorganic ferrous salt FeSO of molar concentration 0.005～0.1mol/L
47H
2O and Na
2EDTA reacts generation.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104190227A (en) * | 2014-07-30 | 2014-12-10 | 武汉悟拓科技有限公司 | Wet flue gas ammonia desulfurization-based synchronous denitration system |
| CN104226095A (en) * | 2014-07-30 | 2014-12-24 | 武汉悟拓科技有限公司 | Synchronous denitration process based on wet ammonia process flue gas desulfurization |
| CN109847548A (en) * | 2018-12-25 | 2019-06-07 | 湖北蔚天环保科技有限公司 | Liquid phase reducing agent, preparation method and application |
| CN111751357A (en) * | 2020-07-22 | 2020-10-09 | 攀钢集团研究院有限公司 | Determination of Fe in a polymorphic iron ion coexisting system in EDTA (ethylene diamine tetraacetic acid) complex denitration liquid2+With Fe3+Method of content |
| CN111751355A (en) * | 2020-07-22 | 2020-10-09 | 攀钢集团研究院有限公司 | Method for determining content of ferrous iron ions in Fe (II) -EDTA (ethylene diamine tetraacetic acid) complex denitration liquid |
| CN111751356A (en) * | 2020-07-22 | 2020-10-09 | 攀钢集团研究院有限公司 | Method for simultaneously determining concentration components of divalent and trivalent iron ions in Fe-EDTA (ethylene diamine tetraacetic acid) complex denitration solution |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190227A (en) * | 2014-07-30 | 2014-12-10 | 武汉悟拓科技有限公司 | Wet flue gas ammonia desulfurization-based synchronous denitration system |
| CN104226095A (en) * | 2014-07-30 | 2014-12-24 | 武汉悟拓科技有限公司 | Synchronous denitration process based on wet ammonia process flue gas desulfurization |
| CN109847548A (en) * | 2018-12-25 | 2019-06-07 | 湖北蔚天环保科技有限公司 | Liquid phase reducing agent, preparation method and application |
| CN109847548B (en) * | 2018-12-25 | 2021-09-17 | 湖北蔚天环保科技有限公司 | Liquid phase reducing agent, preparation method and application |
| CN111751357A (en) * | 2020-07-22 | 2020-10-09 | 攀钢集团研究院有限公司 | Determination of Fe in a polymorphic iron ion coexisting system in EDTA (ethylene diamine tetraacetic acid) complex denitration liquid2+With Fe3+Method of content |
| CN111751355A (en) * | 2020-07-22 | 2020-10-09 | 攀钢集团研究院有限公司 | Method for determining content of ferrous iron ions in Fe (II) -EDTA (ethylene diamine tetraacetic acid) complex denitration liquid |
| CN111751356A (en) * | 2020-07-22 | 2020-10-09 | 攀钢集团研究院有限公司 | Method for simultaneously determining concentration components of divalent and trivalent iron ions in Fe-EDTA (ethylene diamine tetraacetic acid) complex denitration solution |
| CN111751357B (en) * | 2020-07-22 | 2022-05-24 | 攀钢集团研究院有限公司 | Determination of Fe in a polymorphic iron ion coexisting system in EDTA (ethylene diamine tetraacetic acid) complex denitration liquid2+With Fe3+Method of content |
| CN111751356B (en) * | 2020-07-22 | 2022-05-24 | 攀钢集团研究院有限公司 | Method for simultaneously determining concentration components of divalent and trivalent iron ions in Fe-EDTA (ethylene diamine tetraacetic acid) complex denitration solution |
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