CN1005680B - Regeneration of basic aluminum sulfate used for desulfurization of flue gases containing sulfur dioxide of low concentration - Google Patents
Regeneration of basic aluminum sulfate used for desulfurization of flue gases containing sulfur dioxide of low concentration Download PDFInfo
- Publication number
- CN1005680B CN1005680B CN85103518.3A CN85103518A CN1005680B CN 1005680 B CN1005680 B CN 1005680B CN 85103518 A CN85103518 A CN 85103518A CN 1005680 B CN1005680 B CN 1005680B
- Authority
- CN
- China
- Prior art keywords
- solution
- sulfur dioxide
- absorption
- regeneration
- low concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a method for removing sulfur dioxide gas of low concentration in power plant fumes, smelting fumes or sulfuric acid exhaust gas, etc. After the sulfur dioxide gas in the sulfur dioxide gas in the fumes is absorbed by a basic aluminium sulfate solution, and pure sulfur dioxide gas can be desulfurized by heating the solution with steam. The desulfurized solution is recycled. Because the method does not consume raw materials just by replenishing a small amount of aluminium sulfate and lime (or limestone) required for replenishment because the capability for solution absorption of a part of sulfur dioxide is reduced caused by oxidation, the method provides a small amount of gypsum as byproducts. Special measures are taken in the aspects of solution preparation and regeneration so that the stability of the solution is improved and no precipitates are generated in the operation process.
Description
The present invention relates to administer low concentration O with the basic aluminium sulphate method of reproduction
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 type method of reproduction fume desulphurization method can be administered power-plant flue gas.Low concentration SO such as 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)
216-18H
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 need 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, middle temperature reaction temperature is 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:
Al
2（SO
4）
2+Ca（OH）
2→[Al（SO
4）
x（OH）
y（H
2O）
2]
m+CaSO
4↓
Or Al
2(SO
4)
3+ CaCO
3+ H
2O → [Al(SO
4)
x(OH)
y(H
2O)
2]
m+ CaSO
4↓+CO
2↑
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 flue gas desulfurization technique flow 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)
2]
mMaybe can be write as
X Al
2O
3·yAl
2（SO
4）
2
Absorb, take off and inhale reaction:
Al
2O
3·Al
2（SO
4）
3+3SO
2 
Al
2（SO
4）
3·Al（SO
3）
3
Oxidation reaction:
Al
2（SO
4）
2·Al
2（SO
2）
2+3/2O
2→2Al
2（SO
4）
2
Regenerative response:
2Al
2（SO
4）
3+3CaCO
2+6H
2O→Al
2（SO
4）
3·Al
2O
3+3CaSO
4·2H
2O+3CO
2
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
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
2/ rice
2Hours 10～20
Absorption tower liquid-gas ratio: liter/rice
21～10
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
2/ 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, in a filler desorption tower and an evaporimeter, take off suction, desorption tower sprinkle amount is 1 meter
2/ 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, a kind of method that removes low-concentration sulfur dioxide in the flue gas is that the basic aluminium sulphate absorption liquid is contacted with the sulfur dioxide flue gas of low concentration, absorbs sulfur in smoke, it is characterized in that consisting of of absorption liquid:
Basicity 20-40%
Aluminium amount 50-100 restrains Al
2O
2/ liter
Phosphoric acid 0.5-5%
The service speed on absorption tower＜1.5 meter per seconds, its liquid-gas ratio are 1-10 liter/rice
2Solution after the absorption is regenerated with the steam indirect, and taking off the heating-up temperature of inhaling solution is below the solution boiling point.The sprinkle density of desorption tower is 10-20 rice
2/ rice
2Hour.
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 CN85103518A (en) | 1987-08-26 |
| CN1005680B true 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) |
Families Citing this family (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 |
| 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 |
| 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 |
-
1985
- 1985-05-04 CN CN85103518.3A patent/CN1005680B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85103518A (en) | 1987-08-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4233175A (en) | Reagent for treating flue gases and method of preparation | |
| US3928537A (en) | Method of removing sulfur dioxide from combustion exhaust gas | |
| CN100460045C (en) | Process for disposing SOx in discharge gas | |
| CN102836636B (en) | Desulfurization denitration composition, preparation method and application thereof | |
| DE3370942D1 (en) | Method of and apparatus for removing sulfur oxides from hot flue gases | |
| CN1005535B (en) | Processing method of fume | |
| CN101696036B (en) | Preparation process of ammonium paratungstate | |
| CN101757845A (en) | Method for treating sulphur dioxide flue gas | |
| CN1005680B (en) | Regeneration of basic aluminum sulfate used for desulfurization of flue gases containing sulfur dioxide of low concentration | |
| CN102614775A (en) | Method for removing and recovering low concentration sulfur dioxide in industrial exhaust gas | |
| EP0097240A2 (en) | Process for removal of sulfur oxides from hot gases | |
| CN210495844U (en) | Flue gas desulfurization, decarbonization and denitration cooperative treatment system | |
| CN210464078U (en) | Smelting flue gas treatment system | |
| CN111408205A (en) | Ultra-low emission treatment process system and treatment method for industrial silicon electric furnace flue gas | |
| CN207056306U (en) | Gas sweetening denitrating system and flue gas purification system | |
| CN85109395B (en) | Generation of sulphur trioxide from oleum | |
| CN105498504B (en) | Iron pellet sintering exhaust gas cleaner and its purification method and application | |
| CN107042062A (en) | Gas sweetening method of denitration | |
| CN85106271B (en) | Method and system for purification of waste gases | |
| CN109457107B (en) | Method for removing fluorine from tungsten-containing solid | |
| JPS58150417A (en) | Desulfurization of waste gas | |
| CN111841271A (en) | Flue gas desulfurization and denitrification method and system by utilizing co-treatment of carbon monoxide | |
| US2218117A (en) | Manufacture of ammonium sulphate | |
| CN116531933B (en) | Wet multi-pollutant absorbent for flue gas of brick kiln and preparation method thereof | |
| CN109813131B (en) | Method for treating gypsum calcination flue gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |