CN104258710A - Method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation - Google Patents
Method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation Download PDFInfo
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- CN104258710A CN104258710A CN201410506350.5A CN201410506350A CN104258710A CN 104258710 A CN104258710 A CN 104258710A CN 201410506350 A CN201410506350 A CN 201410506350A CN 104258710 A CN104258710 A CN 104258710A
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- liquid
- catalytic oxidation
- phase catalytic
- exhaust gas
- desulfuration
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Abstract
The invention relates to a method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation, and belongs to the field of exhaust gas dust removal and desulfuration treatment method. The method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation comprises the following steps of adding a liquid-phase catalytic oxidation desulfurizing agent into a clean water basin to prepare a solution, conveying the solution into a desulfurizer by a water pump for dust removal and desulfuration according to a certain liquid-gas ratio, entering ash slag water discharged from the desulfurizer into a sedimentation basin, regularly cleaning ash slag after the ash slag is sedimented, flowing clarified water into a pH adjustment basin, adding lime or waste alkali to adjust the pH to 4-5 according to the pH value, and putting the supernate into the clean water basin for recycling. According to the method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation, a manganese sulfate liquid-phase catalytic oxidation desulfurizing agent which contains a surfactant and serves as absorption liquid for absorbing SO2 in exhaust gas; the removal efficiency of SO2 is 83.6-94.5 percent; after being recycled and used for multiple times, the absorption liquid can still keep relatively high desulfuration efficiency; application shows that the liquid-phase catalytic oxidation desulfurizing agent is high in desulfuration efficiency, the technology is simple, the operation is convenient, and the operation cost is low; the method is a desulfuration method with an application prospect.
Description
Technical field
The present invention relates to a kind of liquid phase catalytic oxidation and remove SO in flue gas
2method, belong to flue-gas dust-removing and desulfurization processing method field.
Background technology
According to statistics, the annual SO of China
2total emission volumn is ten thousand t more than 2000, pollutant atmosphere, cause acid rain problem serious.Up to now, research both at home and abroad applies various dry method and Wet Flue Gas Desulfurization Technology, to minimizing SO
2discharge capacity serves larger effect, but it is large that existing desulfur technology also exists investment, operating cost is high, pipeline easily blocks, management maintenance difficulty, and operational reliability is poor, there is the problem such as " can not building " and " can not afford ", therefore, exploitation meets national conditions, and it is the task of top priority that simple economy is suitable for desulfur technology.Liquid phase catalytic oxidation flue gas desulfurization technique can overcome the shortcoming of traditional sulfur method, has larger application prospect.
Summary of the invention
The present invention aims to provide the flue-gas dust-removing and desulfurization processing method that a kind of technique is simple, easy to operate, operating cost is low, treatment effect is good.
Liquid phase catalytic oxidation of the present invention removes SO in flue gas
2method, comprise the following steps:
In clear water reserviors, add liquid catalyzed oxidation desulphurization agent make solution, dust-removal and desulfurizing is carried out by certain liquid-gas ratio feeding devulcanizer with water pump, the clinker water of discharging from devulcanizer flows automatically to sedimentation basin, lime-ash is periodic cleaning after precipitation, primary water flows into pH regulating reservoir, depending on its pH value situation, adds lime or salkali waste carries out being adjusted to pH4-5, supernatant enters clear water reserviors, recycles.
Preferably, liquid catalyzed oxidation desulphurization agent of the present invention be manganese sulfate and surfactant by weight amount ratio be that 99:1 mixes, the solution concentration prepared is 0.5-2%.
Preferred, liquid-gas ratio of the present invention is 0.3-0.5L/Nm3.
Liquid phase catalytic oxidant (Mn is added in liquid phase catalytic oxidation flue gas desulfurization in aqueous
2+), by SO in flue gas
2oxidation, is only absorbed by the water generation sulfuric acid, then in neutralization pond with alkaline matter by it and, active ingredient recycles with primary water.Described liquid phase catalytic oxidation agent by manganese sulfate and surfactant by weight amount ratio 99:1 form, its desulphurization mechanism thinks Mn simply
2+the comprehensive effect such as catalysed oxidn, the effect of surfactant, the effect of " bridge ".Mn
2+can to SO
2play catalysed oxidn, surfactant can make surface free energy occur obviously to reduce, and has and reduces surface tension, solubilization and barbotage etc., as surfactant and Mn
2+combine when carrying out desulfurization, because surfactant reduces surface tension and barbotage, reduce system free energy, be conducive to SO on the one hand
2catalytic absorption reaction in aqueous, on the other hand, when containing SO
2when gas is by solution, SO
2, O
2wrapped up Deng by foam, surfactant one end connects SO
2, O
2deng, the other end connects Mn
2+and H
2o, plays one " bridge " effect, SO
2increase with Mn2+ solution contact surface is long-pending, time of contact is relatively long, is conducive to SO
2catalytic oxidation.
In method of the present invention, affect SO
2the principal element of removal effect has the absorbing liquid circulation of the concentration of catalytic oxidation desulfurization agent, liquid-gas ratio and catalytic oxidation desulfurization agent.Wherein, the concentration of liquid catalyzed oxidation desulphurization agent when 0.5%-2% scope, SO
2removal efficiency be 83.6%-94.5%, along with the concentration of liquid catalyzed oxidation desulphurization agent increases, desulfuration efficiency increases to some extent; Along with the increase of liquid-gas ratio, desulfuration efficiency increases, and in actual applications, in order to economical operation, liquid-gas ratio controls at 0.3-0.5L/Nm3; After absorbing liquid recycles 8 times, desulfuration efficiency change is little, and in analytical solution, the concentration of Mn2+ ion does not change substantially, and this illustrates, liquid catalyzed oxidation desulphurization agent absorbing liquid repeatedly to recycle, and tool has significant practical applications, and absorbing liquid absorbs SO
2after, its pH value of solution <1, when practical application, in order to keep comparatively high desulfurization efficiency, and reducing corrosion, after recycling certain number of times, needing to regulate its pH value.
Liquid phase catalytic oxidation of the present invention removes SO in flue gas
2method, adopt and carry out SO in flue gas containing the manganese sulfate liquid catalyzed oxidation desulphurization agent solution of surfactant as absorbing liquid
2absorption, SO
2removal efficiency be 83.6%-94.5%, absorbing liquid recycles repeatedly, still can keep higher desulfuration efficiency, application shows, liquid catalyzed oxidation desulphurization agent desulfuration efficiency is high, and technique is simple, easy to operate, operating cost is low, is a kind of very promising sulfur method.
Detailed description of the invention
Embodiment one:
Add in clear water reserviors manganese sulfate and surfactant by weight amount ratio be that the solution that concentration is 0.5-2% is made in the liquid catalyzed oxidation desulphurization agent that 99:1 mixes, dust-removal and desulfurizing is carried out by the liquid-gas ratio feeding devulcanizer of 0.3-0.5L/Nm3 with water pump, the clinker water of discharging from devulcanizer flows automatically to sedimentation basin, lime-ash is periodic cleaning after precipitation, primary water flows into pH regulating reservoir, depending on its pH value situation, adds lime or salkali waste carries out being adjusted to pH4-5, supernatant enters clear water reserviors, recycles.
Embodiment two: treatment effect 1
By method of the present invention, carry out desulfurization process to certain 6.5t/h spreader stoker boiler, liquid catalyzed oxidation desulphurization agent concentration is 1.5%, and liquid-gas ratio is 0.5L/Nm3, and result as shown in Table-1.
Table-1 treatment effect
Embodiment three: treatment effect 2
By method of the present invention, carry out desulfurization process to certain 6.5t/h spreader stoker boiler, liquid catalyzed oxidation desulphurization agent concentration is 0.5%, and liquid-gas ratio is 0.3L/Nm3, and result as shown in Table-1.
Table-1 treatment effect
。
Claims (3)
1. liquid phase catalytic oxidation removes SO in flue gas
2method, comprise the following steps:
In clear water reserviors, add liquid catalyzed oxidation desulphurization agent make solution, dust-removal and desulfurizing is carried out by certain liquid-gas ratio feeding devulcanizer with water pump, the clinker water of discharging from devulcanizer flows automatically to sedimentation basin, lime-ash is periodic cleaning after precipitation, primary water flows into pH regulating reservoir, depending on its pH value situation, adds lime or salkali waste carries out being adjusted to pH4-5, supernatant enters clear water reserviors, recycles.
2. liquid phase catalytic oxidation as claimed in claim 1 removes SO in flue gas
2method, it is characterized in that described liquid catalyzed oxidation desulphurization agent be manganese sulfate and surfactant by weight amount ratio be that 99:1 mixes, the solution concentration prepared is 0.5-2%.
3. liquid phase catalytic oxidation as claimed in claim 1 removes SO in flue gas
2method, it is characterized in that described liquid-gas ratio is 0.3-0.5L/Nm3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506350.5A CN104258710A (en) | 2014-09-28 | 2014-09-28 | Method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410506350.5A CN104258710A (en) | 2014-09-28 | 2014-09-28 | Method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104258710A true CN104258710A (en) | 2015-01-07 |
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ID=52150359
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410506350.5A Pending CN104258710A (en) | 2014-09-28 | 2014-09-28 | Method for removing SO2 from exhaust gas by liquid-phase catalytic oxidation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105032487A (en) * | 2015-06-11 | 2015-11-11 | 吉林市环喜科技有限公司 | Preparation method of PDS desulfurization catalyst |
| CN105521710A (en) * | 2016-01-20 | 2016-04-27 | 昆明理工大学 | Desulfurizer |
| CN106422693A (en) * | 2016-11-10 | 2017-02-22 | 昆明新光能源环保科技有限公司 | Method and device of removing SO2 in flue gas by acid-ammonia method |
-
2014
- 2014-09-28 CN CN201410506350.5A patent/CN104258710A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105032487A (en) * | 2015-06-11 | 2015-11-11 | 吉林市环喜科技有限公司 | Preparation method of PDS desulfurization catalyst |
| CN105521710A (en) * | 2016-01-20 | 2016-04-27 | 昆明理工大学 | Desulfurizer |
| CN106422693A (en) * | 2016-11-10 | 2017-02-22 | 昆明新光能源环保科技有限公司 | Method and device of removing SO2 in flue gas by acid-ammonia method |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150107 |