CN106139814A - A kind of method removing sulfur dioxide in tail gas - Google Patents
A kind of method removing sulfur dioxide in tail gas Download PDFInfo
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- CN106139814A CN106139814A CN201510137625.7A CN201510137625A CN106139814A CN 106139814 A CN106139814 A CN 106139814A CN 201510137625 A CN201510137625 A CN 201510137625A CN 106139814 A CN106139814 A CN 106139814A
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- tail gas
- sulfur dioxide
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Abstract
The invention belongs to vent gas treatment field, be specifically related to a kind of method removing sulfur dioxide in tail gas.The technical problem to be solved is to provide a kind of method removing sulfur dioxide in tail gas, and the method comprises the following steps: a, tail gas pretreatment: by the tail gas pretreatment containing sulfur dioxide from sulfuric acid plant's end absorption tower discharge；B, absorption: pretreated for step a tail gas is passed through the adsorbent equipment equipped with adsorbent, can suspend absorption during by the content of sulfur dioxide in the tail gas that absorption plant gives off less than emission request；C, desorbing: the adsorbent that step b has been adsorbed sulfur dioxide resolves, continue after parsing to be passed through the pretreated tail gas of step a in adsorbent equipment, repeats step b, c until completing all of vent gas treatment.The method can separate and recover the sulfur dioxide in tail gas well, has the advantages such as convenient, simple, fast, pollution-free.
Description
Technical field
The invention belongs to vent gas treatment field, be specifically related to a kind of method removing sulfur dioxide in tail gas.
Background technology
The improvement of sulfur dioxide gas, is the most all the most traditional administering method, mainly uses wet method both at home and abroad.The method is adopted
Chemical reaction is carried out so that it is become corresponding sulphite, after reoxidizing, become sulfate with absorbent and sulfur dioxide.According to
The substance classes of absorbent used mainly has: Ammonia Process, sodium-hydroxide method, limestone slurry (or Calx) method, zinc oxide method,
Catalystic oxidation activated carbon method, peroxide passivation, Ozonation, organic amine (or ionic liquid) method etc..But, these methods take off
All exist except sulfur dioxide desulfurizing byproduct value the highest, operating cost is high, equipment corrosion serious, place working environment
The shortcomings such as difference, and the tail gas discharged is very big by the influence of fluctuations being desulfurized tail gas sulphur dioxide content, is difficult to 100% and guarantees row
Put tail gas and reach the emission standards for sulfur dioxide that country is up-to-date.
The shortcoming below making a concrete analysis of above-mentioned each method:
1, limestone slurry (Calx) method: the method brings again the discharge of substantial amounts of carbon dioxide while desulfurization, thus increases
Add greenhouse effect, be unfavorable for the protection to environment.Use lime method desulfurization, during simply displaced lime calcining in advance
Carbon dioxide.
2, catalystic oxidation activated carbon method: the method gained sulfuric acid concentration is less than 20%, and concentration is the lowest, is unfavorable for recycling；And
And, sulfuric acid production system wants catapepsis by-product dilute sulfuric acid, there is water imbalance problem；Energy consumption is the highest, mainly steam consumption
Amount is big；Resolve process conditions very severe, cause equipment corrosion serious, require height to desulfurizing tower is corrosion-resistant；Due to this technique solution
Analysis operating mode is very severe, causes desulfurizing agent efflorescence serious, thus the life-span is shorter, and desulfurizing agent can ensure that desulfurization in 1 year substantially
Effect, more than 1 year, significant desulfurization effect declined；Thus cause desulfurizing agent use cost high；Sulphuric acid is not had for enterprise itself
The sulfur-containing tail gas of process units is administered, and the by-product dilute sulfuric acid of gained is hopeless.Further, since the characteristic of activated carbon itself,
Necessarily cause by-product dilute sulfuric acid color more black, affect sulphuric acid sales value the most at last.
3, organic amine (or ionic liquid) method: the method needs a large amount of steam heat temperature raisings owing to resolving sulfur dioxide operation, makes two
Sulfur oxide gas escapes out from liquid phase, thus causes operating cost higher；This technique belongs to wet desulfurizing process, can not keep away
Exempting to there is the problems such as contaminated, the loss of desulfurizing agent, will cause being continuously replenished ionic liquid, thus ionic liquid consumes relatively big, expense is relatively
High；There is the cooling, purifying of sulfur-containing tail gas in this technique, ionic liquid absorption sulfur dioxide becomes rich solution, and the intensification of sulfur-bearing rich solution resolves,
The operations such as the desalting processing of ionic liquid, the requirement to device is higher, and the device that indivedual operations are used must use high-quality rustless steel
Material.
4, zinc oxide method: although desulfurizing byproduct zinc sulfate can be recycled, but this method is extremely difficult to desulfurization standard-required,
It is not reaching to basic goal.
5, Ammonia Process, sodium-hydroxide method: the method by-product utilized is worth low, especially with sodium-hydroxide method desulfurizing byproduct
Sodium sulfate is worth low especially, thus causes operating cost high；Further, in the place not having ammonia, sodium hydroxide and other matter, nothing
Method popularization and application.
6, peroxide passivation: it is low that the method equally exists by-product dilute sulfuric acid concentration, the problem being unfavorable for recycling；Further, dioxygen
Water belongs to danger compound product, transport difficult, there is potential safety hazard.
7, Ozonation: although the method can overcome transport and potential safety hazard, ozone can be produced in situ in now-making-now-using.But
It is to produce ozone to need a large amount of electric energy, thus causes desulfurization operation cost the highest.
In summary it can be seen, there are problems in the existing technique processing absorption sulfur dioxide in tail gas the most both at home and abroad, these problems
The most all have impact on the popularization and application of various method.
Summary of the invention
The problem existed for above-mentioned existing each sulfur method, it is an object of the invention to provide a kind of brand-new have low energy consumption,
Environmental protection, the method for low cost and other advantages.
The technical problem to be solved is to provide a kind of method removing sulfur dioxide in tail gas.The method includes following step
Rapid:
A, tail gas pretreatment: will be not more than from the tail gas pretreatment containing sulfur dioxide of sulfuric acid plant's end absorption tower discharge to temperature
40 DEG C, pressure is not less than 49KPa；
B, absorption: pretreated for step a tail gas is passed through the adsorbent equipment equipped with adsorbent, sulfur dioxide is adsorbed,
Absorption can be suspended less than emission request by the content of sulfur dioxide in the tail gas that absorption plant gives off；
C, desorbing: the adsorbent that step b has been adsorbed sulfur dioxide carries out desorbing, and collects the sulfur dioxide obtained by desorbing,
Continuing after desorbing in adsorbent equipment, be passed through the pretreated tail gas of step a, repeating step b, c until completing all of sulfur dioxide
Till removing.
Concrete, in said method step a, described pretreatment is: tail gas is first cooled to temperature and is not more than 40 DEG C, then supercharging
It is not less than 49KPa to pressure, is cooled to temperature and is not more than 40 DEG C.
Concrete, in said method step b, described adsorbent is any one in adsorption silica gel, activated carbon.
Concrete, in said method step b, the number of described adsorbent equipment is not less than two, each adsorbent equipment alternating sorbent,
Desorbing.
The inventive method, in addition to using adsorbent, does not use any other reagent, and, this adsorbent is clean, environmental protection, can weigh
Utilize several years even more than ten years again, save the expense changing adsorbent；After sulfur dioxide in tail gas is adsorbed by this method, its
Its gas can directly discharge, and the sulfur dioxide gas purity of collection is high, clean, recoverable, and unlike some sulfur method
Produce the by-product being difficult to process and value is extremely low like that；This method does not produce carbon dioxide by-product, reduces ring
The greenhouse effect in border；The inventive method is pure dry process, and the equipment used is few, corrosion-free to equipment, to operating environment without
Pollute；The inventive method is easy to operate, can use full-automatic process, and existing technique is all unable to reach automatic business processing.
Detailed description of the invention
A kind of method removing sulfur dioxide in tail gas, comprises the following steps:
A, tail gas pretreatment: will be not more than from the tail gas pretreatment containing sulfur dioxide of sulfuric acid plant's end absorption tower discharge to temperature
40 DEG C, pressure is not less than 49KPa；
B, absorption: pretreated for step a tail gas is passed through the adsorbent equipment equipped with adsorbent, sulfur dioxide is adsorbed,
Absorption can be suspended during by the content of sulfur dioxide in the tail gas that absorption plant gives off less than emission request；Described absorption
Agent is any one in adsorption silica gel, activated carbon；
C, desorbing: the adsorbent that step b has been adsorbed sulfur dioxide carries out desorbing, and collects the sulfur dioxide obtained by desorbing,
Continuing after desorbing in adsorbent equipment, be passed through the pretreated tail gas of step a, repeating step b, c until completing all of sulfur dioxide
Till removing.
It is to be understood that in the inventive method step b, when the adsorbent in adsorbent equipment is saturated, this adsorbent does not just have
There is absorbability, then, will be exceeded standard by the content of sulfur dioxide in the tail gas after adsorbent equipment.Conversely speaking, when sending out
When now being exceeded standard by the content of sulfur dioxide in the tail gas after adsorbent equipment, it is considered as adsorbent and has reached saturated, then,
Just should suspend the adsorbent adsorption treatment to tail gas this time the latest.But, by two in the tail gas after adsorbent equipment
Sulfur oxide content be above standard when requiring before whenever, all can suspend absorption, and not adsorbent necessarily reaches
Absorption could be suspended time saturated.
Any absorption is for same adsorbate, and in the case of adsorption equilibrium, temperature is the lowest, and pressure is the highest, inhales
Attached amount is the biggest；Otherwise, temperature is the highest, and pressure is the lowest, then adsorbance is the least.Therefore, the adsorption separating method of gas is generally adopted
With temp.-changing adsorption or two kinds of cyclic processes of pressure-variable adsorption.
If temperature-resistant, adsorb in the case of pressurization, by decompression or the method for normal pressure desorbing, referred to as pressure-variable adsorption.Transformation
Adsorption operations is less due to the thermal conductivity of adsorbent, and the adsorbent bed variations in temperature caused by heat of adsorption and heat of desorption is little, therefore
Can be regarded as isothermal process, its operating mode is carried out approximately along room temperature adsorption isotherm, adsorbs at elevated pressures, relatively
Desorbing under low-pressure.
Absorption is frequently under pressure environment and carries out, and the method that pressure-variable adsorption proposes pressurization and decompression combines, it is typically
The absorption-desorption system being made up of pressurized adsorbent, decompression desorbing, utilizes pressurized adsorbent and decompression desorbing to be combined into adsorption operations
Cyclic process.The adsorbance of adsorbate is increased by adsorbent along with the rising of pressure, and reduces along with the reduction of pressure, with
Time in decompression process, release adsorbed gas, make adsorbent reactivation, the external world need not supply heat and just can carry out adsorbent
Regeneration.
Inventor finds through substantial amounts of research, pressure-variable adsorption is used for the process of sulfur dioxide in tail gas, according to sulfur dioxide gas
Body and other gases are different the difference of the adsorbance of the special adsorbent surface selected by the inventive method and diffusion rate,
Sulfur dioxide gas is made to be adsorbed on the sorbent when pressure is higher；Adsorbent reaches the titanium dioxide that saturated rear blood pressure lowering makes to be adsorbed
Sulfur desorbing gas is out.
In the inventive method, adsorbent equipment can use the adsorption tower of routine, adsorber etc., for industrial efficiency with give off tail gas
Up to standard, adsorbent equipment can have one, can also have multiple.When using multiple adsorbent equipment, these adsorbent equipments have various
The connected mode of various kinds realizes step b of the present invention, c, can use Valve controlling air inlet and give vent to anger between each adsorbent equipment, should
Control system more can carry out full automatic working by Programmable Logic Controller, such as with manual control:
1), during only one of which adsorbent equipment, the content of the sulfur dioxide in tail gas given off after finding by adsorbent equipment exceedes row
When putting standard, being considered as adsorbent and reach saturated, immediately closedown is given vent to anger valve, then adsorbent is carried out desorbing；After desorbing,
Need to be adsorbed by adsorbent equipment by tail gas to be processed again, further according to the sulfur dioxide in the tail gas that adsorbent equipment gives off
Content closes valve of giving vent to anger, then adsorbent carries out desorbing, by that analogy until completing to adsorb work.
2) when having two and during above adsorbent equipment, they can be in the way of using alternating sorbent, i.e. some of them adsorbent equipment
At absorption, other adsorbent equipments in desorbing, such alternate cycles can ensure that industrial production efficiency.Suction type and 1) identical.
3) when having two and during above adsorbent equipment, they can also use the mode of parallel connection, and the most all adsorbent equipments are all being inhaled
Attached, when the content of the sulfur dioxide in tail gas given off of the adsorbent equipment at end exceedes discharge standard, it is considered as all absorption
Adsorbent in device reaches saturated, is shut off valve of giving vent to anger, the more all of adsorbent of desorbing.Suction type and 1)
Identical.
It will be appreciated by those skilled in the art that: close valve of giving vent to anger each time, it is not necessary to have to by the time adsorb and reach saturated
Time just close, it is also possible to absorption reach saturated before whenever closedown give vent to anger valve；Equally, to adsorbent desorbing, the most not
Just can adsorb after necessarily wanting complete desorbing, it is only necessary to the adsorbent after desorbing just has certain absorbability next time
Absorption next time can be carried out.
In the inventive method, number and the connected mode of adsorbent equipment are not limited to above-mentioned several, as long as and can be with side of the present invention
Method reaches the purpose of Adsorption and desorption sulfur dioxide all within the protection domain of the inventive method.
From background technology it can be seen that the prior art method that processes the tail gas containing sulfur dioxide of sulfuric acid plant end absorption tower discharge
All using wet treatment, the most all there are some drawbacks in these methods.In order to solve the energy consumption that above each method exists high,
Cost is high, by-product is worth the drawbacks such as low, and the present inventor, after thinking checking, is provided with in dry method separation tail gas
Sulfur dioxide, is used for pressure-variable adsorption processing the tail gas containing sulfur dioxide of sulfuric acid plant's end absorption tower discharge, have selected suitably
Adsorbent, is adsorbed the selection of sulfur dioxide in the case of transformation by adsorbent, thus has reached separation sulfur dioxide in tail gas
Purpose.The method has low power consuming, environmental protection, by-product utilized rate height etc. series of advantages, and the inventive method is at existing place
The method of the tail gas containing sulfur dioxide of reason sulfuric acid plant end absorption tower discharge cannot be known, thus the inventive method is place
The tail gas containing sulfur dioxide of reason sulfuric acid plant end absorption tower discharge provides a more practical method.
Claims (4)
1. the method removing sulfur dioxide in tail gas, it is characterised in that: comprise the following steps:
A, tail gas pretreatment: will be not more than from the tail gas pretreatment containing sulfur dioxide of sulfuric acid plant's end absorption tower discharge to temperature
40 DEG C, pressure is not less than 49KPa；
B, absorption: pretreated for step a tail gas is passed through the adsorbent equipment equipped with adsorbent, sulfur dioxide is adsorbed,
Absorption is suspended when exceeding emission request until the content of sulfur dioxide in the tail gas given off by absorption plant the latest；
C, desorbing: the adsorbent that step b has been adsorbed sulfur dioxide carries out desorbing, and collects the sulfur dioxide obtained by desorbing,
Continuing after desorbing in adsorbent equipment, be passed through the pretreated tail gas of step a, repeating step b, c until completing all of sulfur dioxide
Till removing.
A kind of method removing sulfur dioxide in tail gas the most according to claim 1, it is characterised in that: in step a, described
Pretreatment be: first tail gas is cooled to no more than 40 DEG C, then is pressurized to be not less than 49KPa, be cooled to no more than 40 DEG C.
A kind of method removing sulfur dioxide in tail gas the most according to claim 1, it is characterised in that: in step b, absorption
The adsorbent used is any one in adsorption silica gel, activated carbon.
A kind of method removing sulfur dioxide in tail gas the most according to claim 1, it is characterised in that: in step b, described
The number of adsorbent equipment be not less than two, each adsorbent equipment alternating sorbent, desorbing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510137625.7A CN106139814A (en) | 2015-03-26 | 2015-03-26 | A kind of method removing sulfur dioxide in tail gas |
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| CN201510137625.7A CN106139814A (en) | 2015-03-26 | 2015-03-26 | A kind of method removing sulfur dioxide in tail gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250089A (en) * | 2020-10-29 | 2021-01-22 | 新晃鲁湘钡业有限公司 | Method for producing sodium metabisulfite by utilizing sulfur-containing tail gas |
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2015
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Patent Citations (4)
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| US20070000385A1 (en) * | 2005-07-01 | 2007-01-04 | Stouffer Mark R | Adsorbents for removing H2S, other odor causing compounds, and acid gases from gas streams and methods for producing and using these adsorbents |
| CN102227248A (en) * | 2008-09-26 | 2011-10-26 | 普莱克斯技术有限公司 | Carbon dioxide purification using activated carbon as nox and so2 sorbent / catalyst |
| CN101805804A (en) * | 2009-02-13 | 2010-08-18 | 广西大学 | Method for preparing CO2-N2 mixed gas from boiler flue gas to be used for clarification process of sugar production |
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| CN112250089A (en) * | 2020-10-29 | 2021-01-22 | 新晃鲁湘钡业有限公司 | Method for producing sodium metabisulfite by utilizing sulfur-containing tail gas |
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Application publication date: 20161123 |
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