CN101862590A - Desulfuration process for sintering flue gas - Google Patents
Desulfuration process for sintering flue gas Download PDFInfo
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- CN101862590A CN101862590A CN 201010215522 CN201010215522A CN101862590A CN 101862590 A CN101862590 A CN 101862590A CN 201010215522 CN201010215522 CN 201010215522 CN 201010215522 A CN201010215522 A CN 201010215522A CN 101862590 A CN101862590 A CN 101862590A
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- China
- Prior art keywords
- desulfuration
- acid carbonate
- sodium acid
- flue gas
- desulfurizing agent
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Abstract
The invention discloses a desulfuration process for sintering flue gas, which adopts a desulfuration agent preparation system, a desulfuration system and a reclamation treatment system. The desulfuration agent is sodium bicarbonate, the 0.045mm standard sieve passing rate of which is no less than 75 percent. Compared with the prior art, the desulfuration process has the advantages that: the processing cost is over 30 percent lower than the cost of slaked lime; the prepared solid desulfuration agent is not easy to deteriorate, and has longer storage life compared with calcium hydroxide; the desulfuration efficiency is improved, and the running cost is reduced; the operation process is simplified; the desulfurized byproducts can be conveniently processed and utilized; and the produced mixture of calcium sulfate, calcium sulfite and calcium carbonate can be conveniently used for producing environment-friendly building materials such as lightweight building blocks, is far more stable than the current desulfurized byproducts and is easier to utilize so as to furthest reduce the discharge of solid wastes and the subsequent treatment expense and meet the current environment-friendly policy.
Description
Technical field
The invention belongs to the desulfurization worker technology of sinter fume, belong to the sulfur removal technology of sintering flue gas of semidry-method recirculating fluidized bed especially.
Background technology
The main character of steel works sintering flue gas and composition are SO
2600-4800mg/m
3, a spot of sulfur trioxide, dust-laden 100-450mg/m
3, water capacity 7%-15%, 85 ℃-190 ℃ of temperature, exhaust gas volumn is greater than 20 * 10
4m
3/ hour.Even at same emission point, SO in the flue gas
2Content also might have than great fluctuation process in the different time periods.Circulating fluid bed semi-drying method technology is more advanced sulfur removal technology, system introduces projects from VAI, mainly form by desulfurizing agent preparation system, desulphurization system, dust collecting system, use the calcium hydroxide micro mist of high-ratio surface to make desulfurizing agent, in the digestion process of lime, in order to increase the specific area of calcium hydroxide micro mist, used triethanolamine, the diethylene glycol class chemicals of some.According to former design parameter, under present market condition, calcium hydroxide is made the production cost of desulfurizing agent above 1000 yuan/ton.In service, the reactivity of desulfurizing agent is lower, only is about 50%; And the accessory substance complex chemical composition after the desulfurization: classical group becomes calcium sulfite 20-31%, calcium sulfate 8-15%, and calcium hydroxide 15-30% reclaims difficulty, and as doing landfill disposal by trade waste, cost is very high, both land occupation, secondary pollution environment again.
Summary of the invention
Technical problem to be solved by this invention provides the sulfur removal technology of the sintering flue gas of semidry-method recirculating fluidized bed that a kind of cost is low, accessory substance is easy to reclaim.
The technical scheme of technical solution problem of the present invention is: a kind of sulfur removal technology of sinter fume, comprise desulfurizing agent preparation system, desulphurization system, recovery and processing system, and described desulfurizing agent is that the percent of pass of 0.045mm standard screen is not less than 75% sodium acid carbonate micro mist; Follow in the desulfurizing tower of micro mist in desulphurization system with sodium acid carbonate and dust, powdered granule fully contacts with flue gas, and sodium acid carbonate and acidic gas in flue gas generation neutralization reaction reduce flue gas sulphur oxide concentration.
After the content (weight) of sodium acid carbonate residual in the desulfurizing agent was less than 15%, this moment, desulfurizing byproduct was mainly sodium sulphate, sodium sulfite, sodium acid carbonate, discharged desulphurization system and entered recovery and processing system.
Described recovery and processing system is: saturated solution (room temperature 25 ℃ time, solution concentration 30%-35%) made in desulfurizing byproduct water dissolving, carried out the gypsification reaction, generate soda bath with excessive milk of lime, and the isolated by filtration post precipitation, filtrate is NaOH; The sodium hydroxide solution that generates is put into sieve-plate tower, regenerate the NaHCO of generation with the carbon dioxide in the flue gas
3Because solubility is little at normal temperatures, precipitated crystal is separated out, and separates after filtration, and drying obtains the sodium acid carbonate of solid powdery; With the sodium acid carbonate that recovery and processing system generated, be transported to carry out in the desulfurizing agent preparation system recycling.
Described milk of lime can use the screenings (chemical composition and metallurgical three classes are in full accord, and less because of particle, smelting procedure can't effectively utilize, and the overwhelming majority is done other purposes or discarded) of gained in the metallurgy lime production, thereby this cost is cheaper.
Reaction principle of the present invention is as follows:
The reaction of sodium acid carbonate and sulfur dioxide in flue gas is:
NaHCO
3+SO
2→NaHSO
3+CO
2
NaHCO
3+NaHSO
3→Na
2SO
3+CO
2+H
2O
The reaction of sulfur trioxide is in sodium acid carbonate and the flue gas:
2NaHCO
3+SO
3→Na
2S?O
4+CO
2+H
2O
The principle that reclaims reaction is as follows:
Na
2SO
4+Ca(OH)
2→CaSO
4↓+NaOH
Na
2SO
3+Ca(OH)
2→CaSO
3↓+NaOH
NaHCO
3+Ca(OH)
2→CaCO
3↓+NaOH
2NaOH+CO
2→Na
2CO
3+H
2O
Na
2CO
3+H
2O+CO
2→2NaHCO
3↓
Among the present invention, sodium acid carbonate and sodium carbonate are as alkaline matter, after sulfur dioxide in flue gas and sulfur trioxide reaction, product is sodium sulfite and sodium sulphate, and at about 100 ℃ and have under the condition that water vapour exists, the speed of above-mentioned reaction is very fast, and in reaction process, gas CO
2During effusion, the particulate of desulfurizing agent sodium acid carbonate there is pulverization, its specific surface is increased, help the carrying out that reacts.And when using calcium hydroxide to make desulfurizing agent, generation be insoluble calcium sulfite and calcium sulfate, the reaction speed of calcium hydroxide particle is slowed down, be unfavorable for the carrying out of W-response.
When the concentration of sulfur dioxide or sulfur trioxide is high (greater than 500ppm time), the reaction speed of sodium acid carbonate is fast.
Compare with two alkali doctor treatments of routine, two alkali doctor treatments absorb operations and are to use the alkali lye desulfurization, and this law is use the sodium bicarbonate powder powder injection desulphurization, and the advantage of this law is that floor space is little, and is low to the corrosivity of equipment, be not easy leakage.
This law is compared with lime-gypsum method, and outstanding feature is, directly lime-gypsum method is in operation, and equipment easily stops up, corrodes, and the reaction rate of this law is faster than lime-gypsum method.And sodium acid carbonate is no consumption in reaction, just does recycled material and uses.
The present invention compared with prior art, the cost that processing cost is made calcium hydroxide than quick lime is low more than 30%; The solid desulfurating agent of making is not perishable, and the storage life is longer than calcium hydroxide; Improve the circulating fluid bed semi-drying method desulfuration efficiency, reduce operating cost; Operation simplifies the operation; Accessory substance after the desulfurization can be processed expediently and handle and utilization, the mixture of the calcium sulfate that is produced, calcium sulfite and calcium carbonate, owing to do not contain calcium hydroxide, can be advantageously used in producing environmental-friendly construction materials such as light block, stable and utilize more than present desulfurizing byproduct than being easier to, reduce the discharging and the subsequent treatment expense of solid waste to greatest extent, met current environmental protection policy.
The specific embodiment
Below in conjunction with embodiment the present invention is done detailed explanation.
Embodiment 1:
A kind of sulfur removal technology of sinter fume, comprise desulfurizing agent preparation system, desulphurization system, recovery and processing system, described desulfurizing agent is that the percent of pass of 0.045mm standard screen is not less than 75% sodium acid carbonate micro mist, follow in the desulfurizing tower of micro mist in desulphurization system with sodium acid carbonate and dust, powdered granule fully contacts with flue gas, sodium acid carbonate and acidic gas in flue gas SO
2And SO
3Neutralization reaction takes place, and flue gas sulphur oxide concentration is reduced.After the content (weight) of sodium acid carbonate residual in the desulfurizing agent is 8%, this moment, desulfurizing byproduct was mainly sodium sulphate, sodium sulfite, sodium acid carbonate, sodium sulphate: sodium sulfite: the weight ratio of sodium acid carbonate is 1: 3: 1, desulfurizing byproduct is discharged desulphurization system enter recovery and processing system.
Technological parameter is: 135 ℃ of input gas temperatures, flow 12m
3/ min, amount of sulfur contenting in smoke 1200ppm, 25 kilograms of sodium acid carbonates of the circulation amount of dusting, 117 ℃ of exit gas temperatures, cycle-index 6 times, outlet flue gas sulfur-bearing 52ppm, desulfurization degree is big by 95%.
Described recovery and processing system is: full solution (room temperature 25 ℃ time, solution concentration 30%-35%) made in desulfurizing byproduct water dissolving, carried out the gypsification reaction, generate soda bath with excessive milk of lime, and the isolated by filtration post precipitation, filtrate is NaOH; The sodium hydroxide solution that generates is put into sieve-plate tower, regenerate the NaHCO of generation with the carbon dioxide in the flue gas
3Because solubility is little at normal temperatures, precipitated crystal is separated out, and separates after filtration, and drying obtains the sodium acid carbonate of solid powdery; With the sodium acid carbonate that recovery and processing system generated, be transported to carry out in the desulfurizing agent preparation system recycling.
After the present invention used 1 year, its extent of corrosion to equipment was quite little, because the alkalescence of sodium acid carbonate is stronger, steel surface was had passivation, so its corrosion is little.
Desulfurizing agent of the present invention is compared with the calcium hydroxide of the high-ratio surface that uses at present, and its rate of sulphur expulsion is fast, and the utilization rate height need not can be used present desulphurization plant transformation.
The present invention has two distinguishing features: the one, the powdered lime of iron and steel enterprise's inside low value is fully utilized, and make desulfurizing agent obtain regeneration by reaction and use, can effectively reduce operating cost; The 2nd, the byproduct stability that step for regeneration produces better can easily can be avoided the stocking and storing of trade waste for the production of wall materials such as light blocks, economizes on resources protection of the environment.
Claims (2)
1. the sulfur removal technology of a sinter fume comprises desulfurizing agent preparation system, desulphurization system, recovery and processing system, it is characterized in that: described desulfurizing agent is that the percent of pass of 0.045mm standard screen is not less than 75% sodium acid carbonate micro mist; Dust following in the desulfurizing tower of sodium acid carbonate micro mist in desulphurization system, powdered granule fully contacts with flue gas, after the content (weight) of sodium acid carbonate residual in the desulfurizing agent is less than 15%, form the desulfurizing agent accessory substance, desulfurizing byproduct is discharged desulphurization system enter recovery and processing system.
2. the sulfur removal technology of a kind of sinter fume according to claim 1, it is characterized in that: described recovery and processing system is: saturated solution is made in the dissolving of desulfurizing byproduct water, carry out the gypsification reaction with excessive milk of lime, generate soda bath, isolated by filtration post precipitation, filtrate are NaOH;
The sodium hydroxide solution that generates is put into sieve-plate tower, react the NaHCO of generation with the carbon dioxide in the flue gas
3Precipitation is separated sedimentation and filtration, and drying obtains the sodium acid carbonate of solid powdery, and mother liquor liquid recycles;
With the sodium acid carbonate that recovery and processing system generated, be transported to carry out in the desulfurizing agent preparation system recycling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010215522 CN101862590A (en) | 2010-06-30 | 2010-06-30 | Desulfuration process for sintering flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010215522 CN101862590A (en) | 2010-06-30 | 2010-06-30 | Desulfuration process for sintering flue gas |
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| Publication Number | Publication Date |
|---|---|
| CN101862590A true CN101862590A (en) | 2010-10-20 |
Family
ID=42954630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010215522 Pending CN101862590A (en) | 2010-06-30 | 2010-06-30 | Desulfuration process for sintering flue gas |
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| CN (1) | CN101862590A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103879970A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Production process for preparing sulfur by recovering sulfur dioxide from flue gas |
| CN103877841A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Integrated purification and recycling process for sintering smoke pollutants |
| CN103877840A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Integral purification process of pollutants in sintering flue gas |
| CN103877839A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Flue gas pollutant control integrated purification process |
| CN105823062A (en) * | 2016-04-27 | 2016-08-03 | 杭州绿能环保发电有限公司 | Desulfurization-deacidification system of clean incineration device for household garbage |
| CN108905615A (en) * | 2018-08-31 | 2018-11-30 | 江苏绿景环保设备有限公司 | Smoke processing system and method after a kind of dangerous waste incineration |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103879970A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Production process for preparing sulfur by recovering sulfur dioxide from flue gas |
| CN103877841A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Integrated purification and recycling process for sintering smoke pollutants |
| CN103877840A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Integral purification process of pollutants in sintering flue gas |
| CN103877839A (en) * | 2014-03-14 | 2014-06-25 | 成都华西堂投资有限公司 | Flue gas pollutant control integrated purification process |
| CN103879970B (en) * | 2014-03-14 | 2015-09-30 | 成都华西堂投资有限公司 | A kind ofly from flue gas, reclaim the production technique that sulfurous gas produces sulphur |
| CN103877841B (en) * | 2014-03-14 | 2016-04-06 | 成都华西堂投资有限公司 | The integrated purifying recovery process of sinter fume pollutant |
| CN105823062A (en) * | 2016-04-27 | 2016-08-03 | 杭州绿能环保发电有限公司 | Desulfurization-deacidification system of clean incineration device for household garbage |
| CN105823062B (en) * | 2016-04-27 | 2018-03-23 | 杭州绿能环保发电有限公司 | A kind of desulfurization deacidification system of house refuse cleaning incinerator |
| CN108905615A (en) * | 2018-08-31 | 2018-11-30 | 江苏绿景环保设备有限公司 | Smoke processing system and method after a kind of dangerous waste incineration |
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Application publication date: 20101020 |