CN85103518A - Remove the basic aluminium sulphate method of reproduction of low concentration sulphur dioxide flue gas - Google Patents
Remove the basic aluminium sulphate method of reproduction of low concentration sulphur dioxide flue gas Download PDFInfo
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- CN85103518A CN85103518A CN85103518.3A CN85103518A CN85103518A CN 85103518 A CN85103518 A CN 85103518A CN 85103518 A CN85103518 A CN 85103518A CN 85103518 A CN85103518 A CN 85103518A
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- China
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- solution
- flue gas
- sulfur dioxide
- gas
- concentration
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Abstract
This law is used to remove low-concentration sulfur dioxide gases such as power-plant flue gas, flue gas during smelting or sulfuric acid tail gas.Behind basic aluminium sulphate solution absorption sulfur dioxide in flue gas gas, use Steam Heating solution, can deviate from pure sulfur dioxide gas.The solution that takes off after the suction recycles.This law does not consume raw material, only need replenish because the absorbent solution ability that a part of sulfur dioxide causes because of oxidation reduces required additional a small amount of aluminum sulfate and lime (or lime stone), so a small amount of gypsum of this law while by-product.
Having taked special measure aspect the preparation of solution, the regeneration, improved the stability of solution, in operating process, can not produce sediment.
Description
The present invention relates to administer low concentration SO with basic aluminium sulphate regeneration
2A kind of wet flue gas desulfurization method of flue gas.
This law as absorbent, optionally absorbs the SO in the flue gas with basic aluminium sulphate solution
2Gas forms a kind of complex compound of complexity.To absorb SO with steam
2The solution indirect, deviate from pure SO
2Gas is deviate from SO
2After solution recycle.Under normal operation, only need make-up solution because of oxide whiskers regenerate required a small amount of aluminum sulfate and lime (or lime stone).
The SO that flue gas is discharged through the absorption tower
2Concentration, allow compliance with emission standards, directly emptying.Wet pure SO from the desorption tower discharge
2Gas behind cool drying, can be processed into sulfuric acid, sulphur or liquid SO
2
This genealogy of law wet reclamation method fume desulphurization method can be administered low concentration SO such as power-plant flue gas, flue gas during smelting or sulfuric-acid production tail gas
2Flue gas.This law and other fume desulphurization method relatively have following characteristics:
This law with abandon method, the gypsum method is compared, and does not produce waste residue, does not need huge slag place or fills out the pond, can not cause secondary pollution or the not high gypsum by-product of output sulfur value.
2. the raw material of preparation basic aluminium sulphate solution is industrial aluminum sulphate Al
2(SO
4)
316-18H
2O and lime or lime stone, convenient sources, price is low, be easy to obtain, and the norm quota of consumption is lower, and the sodium salt method must consume domestic nervous soda ash; Activated carbon method is wanted the active carbon and the iodine of consume expensive; Ammonia process is subjected to each department whether the limitation in ammonia source is arranged, and must consume a certain amount of sulfuric acid; Magnesium oxide method must consume heavy oil, coke.
3. absorptivity and desorption rate absorb operation the fouling blockage problem that the calcium method is prone to can not take place than higher, and equipment is reliable.
4. product is～100%SO
2Gas can be processed into sulfuric acid, liquid SO
2Or sulphur, be worth higher.Need to produce the minor by-products gypsum except that solution regeneration in the flow process, do not have the three waste discharge problem.Contain the iodine activated carbon method and can only obtain～20% dilute sulfuric acid; The propylhomoserin method can produce a large amount of ammonium sulfate liquors; Magnesium oxide method can only obtain being lower than 14%SO
2Gas; The saltcake that sodium salt method by-product is more.
5. this law is compared with U.S.'s basic aluminium sulphate method of reproduction (Hardman Holden method), this law is in formulations prepared from solutions, add aspects such as stabilizing agent, device structure, operation control parameter, different technical methods and measure have been adopted, improved the stability of absorbent solution, prevented that solution from producing precipitation or fouling in the cycling process.According to report in 1970, U.S. H.H method also existed solution easily to produce the situation of precipitation, and this method has adopted the measure of setting up the protection tower before the absorption tower, but needs regular cleaning protection tower.
6. flow sheet equipment is simple, and is easy to operate.
This law comprises four operations:
1. formulations prepared from solutions and solution regeneration;
2. absorption operation;
3. take off the suction operation;
4.SO
2The gas manufacturing procedure.
The preparation method of the basic aluminium sulphate solution that this law adopts (comprising solution regeneration) reacts with industrial aluminum sulphate and milk of lime or limestone fines.Can be divided into three kinds of normal temperature, middle gentle high temperature.In warm reaction temperature be 40-70 ℃, high temperature is 80-100 ℃.Reaction time is 1～3 hour.In order to improve the stability of solution, interpolation phosphoric acid is stabilizing agent.
When this law prepares in absorbent solution, adopt warm preparation method in the milk of lime, use milk of lime and two kinds of nertralizers of agstone during regeneration.
The formulations prepared from solutions principle:
In aluminum sulfate aqueous solution, add milk of lime or limestone fines, following reaction promptly takes place:
Reaction temperature is high more, and reaction speed is big more.The normal-temperature reaction time is 24 hours, and the middle gentle pyroreaction time is 1～3 hour.The solution for preparing through static clarification, uses after the heat treatment.
Basic aluminium sulphate method of reproduction process chart is seen shown in the accompanying drawing.
Low concentration SO
2Flue gas enters absorption tower 2 through air blast, and the absorbent solution counter current contacting absorption with the cat head sprinkle absorbs the directly emptying 15 of back gas, goes out the absorption tower and contains SO
2Rich solution, through fluid-tight 3, wait to take off imbibition storage tank 4, pump 5 is delivered to heat exchanger 6, inhales the back hot solution and carries out heat exchange with taking off, and gives heat after desired temperature, enters desorption tower 7, solution sprays from top to bottom, carries out heat exchange with the steam 12 of evaporimeter 8, stripping goes out SO in the solution
2Gas, the solution that goes out from tower bottom flow enters evaporimeter 8, with steam 13 indirect solution, further removes remaining SO in the solution
2, remove SO
2After solution, after heat exchanger 6 and cold soln heat exchange, behind normal temperature, flow into absorption liquid storage tank 10 through heat exchanger 9 waters 14 indirect cooling solutions, and deliver to the absorption tower through pump 11, solution recycles.
Because SO
2In absorption process, can the part oxidation constantly take place, absorbability is reduced gradually, in order to keep the certain absorption ability, the solution that part is taken off after the suction will be delivered to regenerative system 12, carry out solution regeneration, from desorption tower 7 take off sucking-off～100%SO
2Gas 16 can further send SO
2System of processing 17 is carried out back processing.
Basic aluminium sulphate solution absorbs SO
2Inhale SO with taking off
2Reaction equation and process operation parameter as follows:
Basic aluminium sulphate solution general expression:
(Al(SO
4)
x(OH)
y(H
2O)
z)
mMaybe can be write as
x Al
2O
3·y Al
2（SO
4）
3
Absorb, take off and inhale reaction:
Oxidation reaction:
Regenerative response:
The main technique operating parameter:
Absorptivity,＞90%
Desorption rate,＞95%
Absorbent solution basicity %, 20～40
Absorbent solution aluminium content, gram Al
2O
3/ liter, 50～120
Absorbent solution SO
2Content, gram SO
2/ liter, 10～30
Take off and inhale the remaining SO of back solution
2Content, gram SO
2/ liter,＜1
The absorption tower service speed, meter per second,＜1.5
Take off and inhale the solution heating-up temperature, ℃, below the boiling point
Desorption tower sprinkle density, rice
3/ rice
2Hours 10～20
The absorption tower liquid-gas ratio, liter/rice
31～10
Absorb the SO of flue gas
2Concentration range, % 0.1～6
Go out the evaporimeter solution temperature, ℃ 90～110
Phosphorus acid content in the solution, % 0.5～5%
Example:
Administer SO with basic aluminium sulphate solution
2Concentration is the 3000ppm power-plant flue gas.Power-plant flue gas enters the SO of flue gas desulphurization system after dedusting, cooling and washing
2The absorption tower.With the absorbent solution of above-mentioned basicity and aluminium weight range, in a packed tower, contact absorption with back flow of gas, absorption liquid sprinkle amount is 1 meter
3/ hour, go out absorption tower solution and contain SO
215 grams per liters absorb back tail gas SO
2Concentration is 150ppm, directly emptying, and absorptivity is 95%.
Absorb SO
2Solution, send and take off desorption system.Take off suction in a filler desorption tower and an evaporimeter, desorption tower sprinkle amount is 1 meter
3/ hour, take off and smoke less than 5 kilograms per centimeter
2The low-pressure steam indirect is taken off and is inhaled back solution S O
2Amount～0.1 grams per liter, taking off and inhaling efficient is 99% to go out desorption tower gas SO
2Concentration～100%(butt), but drying, compression are made liquid SO
2Byproduct.
Claims (5)
1, the present invention is a kind of wet type regeneration flue gas desulfurization method, is applicable to low-concentration sulfur dioxide gases such as administering power-plant flue gas, flue gas during smelting and sulfuric-acid production tail gas.Technical characterictic of the present invention is to adopt the basic aluminium sulphate solution of handling through overstability as absorbent, and the solution after the absorption is regenerated with the steam indirect, deviates from only to contain the pure sulfur dioxide gas of a small amount of water vapor simultaneously.
2, according to first claim, the present invention can be used on the improvement of low concentration sulphur dioxide flue gas, and the concentration range of sulfur dioxide in flue gas is 0.1～6%.The solution composition that the present invention uses, its basicity scope is 20～40%, the aluminium content range is 50～120 gram Al in the solution
2O
3/ liter.1～10 liter/meter of absorption tower operation liquid-gas ratio
3, absorption efficiency is greater than 90%.
3, according to the 1st, 2 claim, the present invention in order to obtain to be difficult for taking place the solution of fouling precipitation, has taked following stable treatment measures in the formulations prepared from solutions process:
(1) add the phosphoric acid used as stabilizers in solution, addition is 0.5～5%;
(2) Zhi Bei absorbent solution leaves in the basin, carries out static clarification, and further heat treated, and heat treatment is 80～100 ℃, and be 1～3 hour heat time heating time.
(3) aspect device structure, adopt kestner long-tube evaporator, solution was reduced in the high-temperature region time of staying.Evaporator part is removed solution in design and is remained in a standstill or the dead angle.
4, according to the 1st, 2,3 claim, the present invention since the sweetening process solution concentration or when heat treatment solution inspissation and need keep original aluminium content the time, must replenish the aqueous solution that contain sulfur dioxide, can not directly add water, to avoid producing precipitation.
5, according to the 1st claim, take off inhale before solution be heated to below the boiling point, the evaporator outlet gas concentration, go out the desorption tower solution temperature, go out the evaporimeter solution temperature and be controlled at 90～110 ℃, solution removes sulfur dioxide efficient greater than 95%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103518.3A CN1005680B (en) | 1985-05-04 | 1985-05-04 | Regeneration of basic aluminum sulfate used for desulfurization of flue gases containing sulfur dioxide of low concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103518.3A CN1005680B (en) | 1985-05-04 | 1985-05-04 | Regeneration of basic aluminum sulfate used for desulfurization of flue gases containing sulfur dioxide of low concentration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103518A true CN85103518A (en) | 1987-08-26 |
| CN1005680B CN1005680B (en) | 1989-11-08 |
Family
ID=4793250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85103518.3A Expired CN1005680B (en) | 1985-05-04 | 1985-05-04 | Regeneration of basic aluminum sulfate used for desulfurization of flue gases containing sulfur dioxide of low concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1005680B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029108A (en) * | 2010-11-07 | 2011-04-27 | 湖南新恒光科技有限公司 | Method and process for recovering sulfur dioxide from absorption tail gas in production process of sulfuric acid |
| CN104132555A (en) * | 2014-08-13 | 2014-11-05 | 铜陵有色金属集团股份有限公司金冠铜业分公司 | Treatment system for low concentration SO2 flue gas of anode furnace |
| CN105712387A (en) * | 2016-03-15 | 2016-06-29 | 北京世纪地和控股有限公司 | Method for preparing aluminum hydroxide sulfate |
| CN110935304A (en) * | 2019-12-02 | 2020-03-31 | 内蒙古工业大学 | Basic aluminum sulfate regeneration desulfurization method based on inhibition of oxidation and multi-field synergistic desorption |
| CN113350971A (en) * | 2021-06-29 | 2021-09-07 | 宁波久丰热电有限公司 | Desulfurization waste recycling device and process thereof |
-
1985
- 1985-05-04 CN CN85103518.3A patent/CN1005680B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029108A (en) * | 2010-11-07 | 2011-04-27 | 湖南新恒光科技有限公司 | Method and process for recovering sulfur dioxide from absorption tail gas in production process of sulfuric acid |
| CN104132555A (en) * | 2014-08-13 | 2014-11-05 | 铜陵有色金属集团股份有限公司金冠铜业分公司 | Treatment system for low concentration SO2 flue gas of anode furnace |
| CN105712387A (en) * | 2016-03-15 | 2016-06-29 | 北京世纪地和控股有限公司 | Method for preparing aluminum hydroxide sulfate |
| CN110935304A (en) * | 2019-12-02 | 2020-03-31 | 内蒙古工业大学 | Basic aluminum sulfate regeneration desulfurization method based on inhibition of oxidation and multi-field synergistic desorption |
| CN110935304B (en) * | 2019-12-02 | 2021-10-12 | 内蒙古工业大学 | Basic aluminum sulfate regeneration desulfurization method based on inhibition of oxidation and multi-field synergistic desorption |
| CN113350971A (en) * | 2021-06-29 | 2021-09-07 | 宁波久丰热电有限公司 | Desulfurization waste recycling device and process thereof |
| CN113350971B (en) * | 2021-06-29 | 2022-11-11 | 宁波久丰热电有限公司 | Desulfurization waste recycling device and process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1005680B (en) | 1989-11-08 |
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