CN106492602A - A kind of compound fume desulfurizing agent and its sulfur method - Google Patents
A kind of compound fume desulfurizing agent and its sulfur method Download PDFInfo
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- CN106492602A CN106492602A CN201610971533.3A CN201610971533A CN106492602A CN 106492602 A CN106492602 A CN 106492602A CN 201610971533 A CN201610971533 A CN 201610971533A CN 106492602 A CN106492602 A CN 106492602A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
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- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/608—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
A kind of compound fume desulfurizing agent and its sulfur method, are related to a kind of gas cleaning, special flue gas complexing agent and sulfur method.It is characterized in that the weight/mass percentage composition of its desulfurizing agent is consisted of：0.5～35% magnesia, 0.5～35% ammonium sulfite, 0.5～35% ammonium sulfate, 0～35% saltcake, 0～20% ammoniacal liquor, 0.5～15% acylate.Its flue gas desulfurization course is to react flue gas and desulfurization absorbing liquid, and desulfurization absorbing liquid is mixed with water by composite desulfurizing agent, doctor solution and ammoniacal liquor reaction regeneration, regeneration underflow add to desulfurization absorbing liquid in recycling；Regeneration overflow is reacted with lime slurry, and reaction is filtered after terminating, and the liquid phase for obtaining is returned and used as ammoniacal liquor, and the solid phase for obtaining is gypsum.The fume desulphurization method that the present invention is provided can reduce liquid-gas ratio, reduce desulfurization energy consumption, improve desulfuration efficiency, and the regeneration efficiency of composite desulfurizing agent is high, there is no sulfuric acid salt accumulation fouling.
Description
Technical field
A kind of compound fume desulfurizing agent and its sulfur method, are related to a kind of gas cleaning, special flue gas complexing agent and desulfurization
Method.
Background technology
At present, operational flue gas desulfurization technique is varied, such as limestone/lime-gypsum method desulfurization, magnesium oxide method
The desulfurization technology such as desulfurization, the ammonia process of desulfurization, double alkali method desulfurizing.Absorbent, desulfurization pair used by a variety of flue gas desulfurization techniques
Product, and desulfuration efficiency and cost of investment difference very big.Simply introduced separately below.
Limestone/lime-gypsum method desulfurization is the desulfurization technology for generally adopting at present, stable, and desulfurized effect is preferable,
It is applied to large-sized boiler system desulfurization.Sweetening process is mainly the SO in flue gas2H is decomposed into when droplet is run into+And HSO3 ?Or
SO3 2-, with the Ca absorbed in slurries2+Reaction generates Ca (HSO3)2Or CaSO3, CaSO3It is oxidized to CaSO4, the two is extremely difficult to be dissolved in
Water, under this chemical motive force effect, promotes SO2The further reaction that dissolves, chain-type occurs, by flue gas in SO2
With absorb the continuous reaction of slurries reaching the purpose of desulfurization.The technique in running, because liquid-gas ratio big, about 12～18L/
m3, cause equipment investment big, operation energy consumption high cost；PH value control condition is more harsh, and Ruo Tanei slurries pH are too high, easily make
Into lime solubility is low, gypsum crystallization is difficult to grow up, cause deposition fouling, gypsum filtration difficulty in tower, cause system operation not
Normally, Ruo Tanei slurries pH is too low, easily causes equipment corrosion；Lime stone-gypsum method desulfurization is also easy to cause particulate matter to increase.This
Kind of phenomenon all generally existing in the desulphurization system of many enterprises.
The general principle of magnesium oxide method desulfurization is to absorb the SO in flue gas with the slurries of MgO2, generate aqueous magnesium sulfite and
Magnesium sulfate.The absorbing liquid for absorbing sulphur content falls into absorption tower bottom.Tower bottom predominantly oxidation, cyclic process is absorbed, by aeration drum
Blower fan is forced to provide a large amount of compressed airs into bottom of towe slurries so that cause the MgSO of COD3It is oxidized to MgSO4.Oxidation
Magnesium desulphurization reaction is strong compared with lime, and required liquid-gas ratio is less, liquid-gas ratio about 4～6L/m3, but magnesia price by regional impact compared with
Greatly, the problem of the wastewater treatment of a large amount of containing magnesium sulfates and can be produced in sweetening process, and therefore the technology general applicability is not strong.
The ammonia process of desulfurization with the aqueous solution in NH3And SO2Based on reaction, Multifunctional smoke desulfurizing tower absorber portion by SO2
Absorb, obtain the aqueous solution of desulfurization intermediate products ammonium sulfite and ammonium bisulfite, desulfurizing tower oxidation panel by ammonium sulfite
Ammonium sulfate is oxidized to, and ammonium sulfate saturated solution is obtained after concentrated section of concentration, through evaporating, being dried to obtain ammonium sulfate product.Ammonia process
Desulfurization is a kind of efficient, wet desulphurization mode of low power consuming, and sweetening process is gas-liquid phase reaction, and soon, absorbent is sharp for reaction rate
High with rate, desulfuration efficiency 95%～99% can be kept；SO can be realized2Recycling.Its evident characteristic is：Without secondary useless
Slag, waste water and exhaust emission；Reclaim SO2, sulphur ammonium is produced, SO is realized2The maximization of recovery value.But shortcoming is that ammonium sulfate steams
Dry dry equipment needed thereby is complicated, and investment is big, and production marketing is limited to by market.
Double alkali method desulfurizing is grown up for overcoming the shortcoming of Wet Limestone/lime-gypsum method fouling.Dual alkali
Using soda ash activation system, soda absorbs SO2Generate solvable Na2SO3After class salt, desulfuration solution enters lime regenerative system,
By ion-exchange reactions, insoluble CaSO is produced3And CaSO4Salt, as sediment by outer row or post processing, again
The soda supernatant of generation returns to absorption tower recycling.Dual alkali advantage is that desulfuration efficiency is high, invests little, operation energy consumption
Low, general 4～6L/m of liquid-gas ratio3?.But which is the disadvantage is that, the accessory substance Na of desulfurization generation2SO4The ability regenerated by lime
Difference, needs longer reaction time and harsher reaction condition, and under general industry service condition, regeneration rate is less than 30%；
Na2SO4Long term accumulation the cocrystallization for causing sodium sulphate and gypsum is separated out, cause pipeline, spiral board even pool wall, paddle
Deng facility serious scale, systemic breakdown is ultimately resulted in.This is the phenomenon that the technique often occurs in actual motion.Many pairs of alkali
After method operation a period of time, be forced to be changed to single alkaline process, i.e., only using NaOH, but operating cost height (ton SO22500 yuan of cost of removing
Left and right), and to have a large amount of Na2SO4Arrange outside waste water.
Content of the invention
The purpose of the present invention is aiming at the deficiency that above-mentioned prior art is present, there is provided one kind effectively can reduce liquid-gas ratio,
Reduce desulfurization energy consumption, improve desulfuration efficiency, the regeneration efficiency of desulfurizing agent is high, can effectively solving sulfuric acid salt accumulation scale problems answer
Close fume desulfurizing agent and its sulfur method.
The purpose of the present invention is achieved through the following technical solutions.
A kind of compound fume desulfurizing agent, it is characterised in that the weight/mass percentage composition of its desulfurizing agent is consisted of：0.5～35%
Magnesia, 0.5～35% ammonium sulfite, 0.5～35% ammonium sulfate, 0～35% saltcake, 0～20% ammoniacal liquor, 0.5
～15% acylate.
The sulfur method of a kind of compound fume desulfurizing agent of the present invention, it is characterised in that include the step of its sweetening process：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid absorbs
SO in flue gas2After become doctor solution；
The desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, is combined fume desulfurizing agent in desulfurization absorbing liquid
Mass percentage content be 0.5%～15%；
The weight/mass percentage composition of the composite desulfurizing agent is consisted of：0.5%～35% magnesia, 0.5%～35%
Ammonium sulfite, 0.5%～35% ammonium sulfate, 0～35% saltcake, 0～20% ammoniacal liquor, 0.5%～15% organic acid
Salt；
(2) desulfurization regeneration
The doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, the regeneration
Underflow is recycled in adding to the desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
Regeneration overflow and the lime slurry stirring reaction, the mass percent concentration of the lime slurry is 8%～
15%, reaction is filtered after terminating, and the liquid phase for obtaining is back to step (2), uses as ammoniacal liquor, and the solid phase for obtaining is gypsum.
The present invention a kind of compound fume desulfurizing agent, it is characterised in that the acylate optionally from carboxylate, sulfonate,
Sulfinate and thionothiolic acid salt.
A kind of compound fume desulfurizing agent of the present invention, it is characterised in that the weight/mass percentage composition composition of the composite desulfurizing agent
For：15～35% magnesia, 15～35% ammonium sulfite, 15～35% ammonium sulfate, 15～35% saltcake, 0.5～
15% acylate.
A kind of compound fume desulfurizing agent of the present invention, it is characterised in that the weight/mass percentage composition composition of the composite desulfurizing agent
For：25% magnesia, 25% ammonium sulfite, 25% ammonium sulfate, 20% saltcake, 5% acylate.
The compound fume desulfurizing agent and its sulfur method of the present invention, it is possible to decrease liquid-gas ratio, reduces desulfurization energy consumption, improves desulfurization
Efficiency, the regeneration efficiency of composite desulfurizing agent are high, there is no sulfuric acid salt accumulation fouling.Composite desulfurizing agent solubility high and with
SO2Reactive strong, desulfuration efficiency can be up to more than 99.8%；Desulfurization product under the invigoration effect of acylate, with lime
Slurry reaction and keep more than 90% reaction efficiency.
Specific embodiment
A kind of compound fume desulfurizing agent, its weight/mass percentage composition are consisted of：0.5%～35% magnesia, 0.5%～
35% ammonium sulfite, 0.5%～35% ammonium sulfate, 0～20% ammoniacal liquor, 0.5%～15% acylate.
Using the sulfur method of the compound fume desulfurizing agent of the present invention, including step：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid absorbs
SO in flue gas2After become doctor solution；
The desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, the matter of composite desulfurizing agent in desulfurization absorbing liquid
Amount degree is 0.5～15%；
The weight/mass percentage composition of the composite desulfurizing agent is consisted of：0.5～35% magnesia, 0.5～35% sulfurous
Sour ammonium, 0.5～35% ammonium sulfate, 0～35% saltcake, 0～20% ammoniacal liquor, 0.5～15% acylate；
(2) desulfurization regeneration
The doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, the regeneration
Underflow is recycled in adding to the desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
The regeneration overflow and lime slurry stirring reaction, the mass percent concentration of the lime slurry is 8～15%,
Reaction is filtered after terminating, and the liquid phase for obtaining is back to step S2, uses as ammoniacal liquor, and the solid phase for obtaining is gypsum.
Preferably, the weight/mass percentage composition of the composite desulfurizing agent is consisted of：15%～35% magnesia, 15%～
35% ammonium sulfite, 15%～35% ammonium sulfate, 15%～35% saltcake, 0.5%～15% acylate.
It is further preferred that the weight/mass percentage composition of the composite desulfurizing agent is consisted of：25% magnesia, 25% Asia
Ammonium sulfate, 25% ammonium sulfate, 20% saltcake, 5% acylate.
Preferably, the acylate is optionally from carboxylate, sulfonate, sulfinate and thionothiolic acid salt.
A kind of composite desulfurizing agent that the present invention is provided, its weight/mass percentage composition are consisted of：0.5～35% magnesia, 0.5
～35% ammonium sulfite, 0.5～35% ammonium sulfate, 0～20% ammoniacal liquor, 0.5～15% acylate.
Preferably, the weight/mass percentage composition of composite desulfurizing agent is consisted of：15～35% magnesia, 15～35% sulfurous
Sour ammonium, 15～35% ammonium sulfate, 15～35% saltcake, 0.5～15% acylate.
It is further preferred that the weight/mass percentage composition of the composite desulfurizing agent is consisted of：25% magnesia, 25% Asia
Ammonium sulfate, 25% ammonium sulfate, 20% saltcake, 5% acylate.
Preferably, the acylate is optionally from carboxylate, sulfonate, sulfinate and thionothiolic acid salt.
Preferably, when the composite desulfurizing agent is used, desulfurization absorbing liquid is hybridly prepared into water, be combined in desulfurization absorbing liquid
The mass percentage content of desulfurizing agent is 0.5～15%.
The Novel flue gas sulfur method that the present invention is provided, mainly contains Mg (OH) in the desulfurization absorbing liquid of employing2、(NH4)2SO3、NH4OH、(NH4)2SO4, NaOH, acylate, flue gas and desulfurization absorbing liquid haptoreaction remove the SO in flue gas2, obtain
Arrive purifying smoke.The key reaction that sweetening process is related to is as follows：
SO2+Mg(OH)2=MgSO3+H2O
SO2+(NH4)2SO3+H2O=2NH4HSO3
SO2+2NH4OH=(NH4)2SO3+H2O
2NaOH+SO2=Na2SO3+H2O
Desulfurization absorbing liquid absorbs the SO in flue gas2After become doctor solution.Mainly contain MgSO in doctor solution3、NH4HSO3、
(NH4)2SO3、(NH4)2SO4、Na2SO3, acylate etc..
Doctor solution is regenerated with ammoniacal liquor reaction, and the key reaction being related to is：
MgSO3+2NH4OH=Mg (OH)2↓+(NH4)2SO3
Sedimentation separation is carried out after regeneration, obtains regenerating overflow and regeneration underflow, main (OH) containing Mg in regeneration underflow2,
Contain (NH in attachment liquid4)2SO3、NH4OH、(NH4)2SO4、Na2SO3, acylate, regeneration underflow adds to desulfurization absorbing liquid
Recycle；Mainly contain (NH in regeneration overflow4)2SO3、Na2SO3, acylate, also a small amount of NH4HSO3(NH4)2SO4,
Overflow and lime slurry stirring reaction is regenerated, the key reaction being related to is：
2CaSO3+O2+4H2O→2CaSO4·2H2O↓
Reaction is filtered after terminating, and the liquid phase for obtaining mainly contains NH4OH, NaOH, acylate, are back to step S2, as
Ammoniacal liquor is used, and the solid phase for obtaining is gypsum.
Add appropriate ammonium sulfate, saltcake in composite desulfurizing agent and can compensate the ammonia and soda lost in sweetening process,
Material low price, and than convenient transportations such as ammoniacal liquor, NaOH.The effect for adding acylate is to promote regeneration overflow processing stage
The dissolving of lime, improves the treatment effeciency of regeneration overflow, and buffer system pH changes, and suppresses Ammonia valatilization loss.
The Novel flue gas sulfur method that the present invention is provided, the composite desulfurizing agent solubility height for using and and SO2It is reactive strong,
Desulfuration efficiency can be up to more than 99.8%；Desulfurization product under the invigoration effect of acylate is reacted with lime slurry and is protected
Hold more than 90% reaction efficiency.
Generally, the Novel flue gas sulfur method that the present invention is provided can reduce liquid-gas ratio, reduce desulfurization energy consumption, improve desulfurization
Efficiency, has outstanding advantage in terms of investment, operating cost, desulfuration efficiency, secondary pollution.Compared with conventional MgO methods desulfurization, carry
The high solubility of MgO, solves MgSO4Emission problem；Compared with ammonia process, the ammonia density in desulfurization absorbing liquid is low, can gram
The problems such as taking the escaping of ammonia, ammonium sulfate waste water and dispose；Compared with lime stone-gypsum method, reaction speed is fast, it is possible to decrease liquid-gas ratio, reduces fortune
Row energy consumption, small investment, operating cost are low；Compared with sodalime double alkali method, the regeneration efficiency of composite desulfurizing agent is high, there is no sulfate
The problem of accumulation fouling, stable, alkali lye consumption is few, and operating cost is low.Specifically compare and see the table below.
The Novel flue gas sulfur method that the present invention is provided, can be in flue gases such as recirculating fluidized bed, coal-powder boiler, petroleum coke calciners
Applied in harnessing project, in operation test, any fouling and clogging phenomenon do not occurred.
Technical scheme is described in detail below by specific embodiment.
Embodiment 1
The Novel flue gas sulfur method that the present embodiment is provided, comprises the following steps：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid absorbs
SO in flue gas2After become doctor solution；
Desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, the quality hundred of composite desulfurizing agent in desulfurization absorbing liquid
It is 0.5% to divide than content；
The weight/mass percentage composition of composite desulfurizing agent is consisted of：30% magnesia, 30% ammonium sulfite, 29% sulfuric acid
Ammonium, 10% ammoniacal liquor, 1% acylate；Acylate is sulfonate；
(2) desulfurization regeneration
Doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, and regeneration underflow is added
Recycle into desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
Regeneration overflow and lime slurry stirring reaction, the mass percent concentration of lime slurry is 8%, reacts mistake after terminating
Filter, the liquid phase for obtaining are back to step 2, use as ammoniacal liquor, and the solid phase for obtaining is gypsum.
Run in 2 × 90t/h circulating fluid bed flue-gas desulfurizings, gas liquid ratio is 4L/m3Left and right, flue gas SO2Concentration can be from
3000mg/Nm35mg/Nm is more than removed to3Left and right, ton SO21000 yuan or so of cost of removing.Through operation, there is not any knot
Dirty clogging.
Embodiment 2
The Novel flue gas sulfur method that the present embodiment is provided, comprises the following steps：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid absorbs
SO in flue gas2After become doctor solution；
Desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, the quality hundred of composite desulfurizing agent in desulfurization absorbing liquid
It is 5% to divide than content；
The weight/mass percentage composition of composite desulfurizing agent is consisted of：35% magnesia, 25% ammonium sulfite, 15% sulfuric acid
Ammonium, 10% saltcake, 15% acylate；Acylate is ammonium benzene sulfonate；
(2) desulfurization regeneration
Doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, and regeneration underflow is added
Recycle into desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
Regeneration overflow and lime slurry stirring reaction, the mass percent concentration of lime slurry is 10%, after reaction terminates
Filter, the liquid phase for obtaining is back to step 2, uses as ammoniacal liquor, the solid phase for obtaining is gypsum.
Run in 2 × 35t/h coal-powder boiler flue gas desulfurizations, gas liquid ratio is 4L/m3Left and right, flue gas SO2Concentration can be from
3000mg/Nm35mg/Nm is more than removed to3Left and right.Through operation, there is not any fouling and clogging phenomenon.
Embodiment 3
The Novel flue gas sulfur method that the present embodiment is provided, comprises the following steps：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid absorbs
SO in flue gas2After become doctor solution；
Desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, the quality hundred of composite desulfurizing agent in desulfurization absorbing liquid
It is 0.5% to divide than content；
The weight/mass percentage composition of composite desulfurizing agent is consisted of：35% magnesia, 35% ammonium sulfite, 25% sulfuric acid
Ammonium, 5% acylate；Acylate is carboxylate；
(2) desulfurization regeneration
Doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, and regeneration underflow is added
Recycle into desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
Regeneration overflow and lime slurry stirring reaction, the mass percent concentration of lime slurry is 15%, after reaction terminates
Filter, the liquid phase for obtaining is back to step 2, uses as ammoniacal liquor, the solid phase for obtaining is gypsum.
Run in petroleum coke calciners flue gas desulfurization, gas liquid ratio is 6L/m3Left and right, flue gas SO2Concentration can be from
5000mg/Nm320mg/Nm is more than removed to3Left and right.Through operation, there is not any fouling and clogging phenomenon.
Embodiment 4
The Novel flue gas sulfur method that the present embodiment is provided, comprises the following steps：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid absorbs
SO in flue gas2After become doctor solution；
Desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, the quality hundred of composite desulfurizing agent in desulfurization absorbing liquid
It is 10% to divide than content；
The weight/mass percentage composition of composite desulfurizing agent is consisted of：15% magnesia, 35% ammonium sulfite, 35% sulfuric acid
Ammonium, 15% acylate；Acylate is sulfinate；
(2) desulfurization regeneration
Doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, and regeneration underflow is added
Recycle into desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
Regeneration overflow and lime slurry stirring reaction, the mass percent concentration of lime slurry is 8%, reacts mistake after terminating
Filter, the liquid phase for obtaining are back to step 2, use as ammoniacal liquor, and the solid phase for obtaining is gypsum.
Run in 2 × 90t/h circulating fluid bed flue-gas desulfurizings, gas liquid ratio is 4L/m3 or so, flue gas SO2Concentration can be with
From 3000mg/Nm35mg/Nm is more than removed to3Left and right, ton SO21050 yuan or so of cost of removing.Through operation, do not occur any
Fouling and clogging phenomenon.
Embodiment 5
The Novel flue gas sulfur method that the present embodiment is provided, comprises the following steps：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid absorbs
SO in flue gas2After become doctor solution；
Desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, the quality hundred of composite desulfurizing agent in desulfurization absorbing liquid
It is 15% to divide than content；
The weight/mass percentage composition of composite desulfurizing agent is consisted of：25% magnesia, 25% ammonium sulfite, 25% sulfuric acid
Ammonium, 20% saltcake, 5% acylate；Acylate is thionothiolic acid salt；
(2) desulfurization regeneration
Doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, and regeneration underflow is added
Recycle into desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
Regeneration overflow and lime slurry stirring reaction, the mass percent concentration of lime slurry is 8%, reacts mistake after terminating
Filter, the liquid phase for obtaining are back to step 2, use as ammoniacal liquor, and the solid phase for obtaining is gypsum.
Run in 90t/h circulating fluid bed flue-gas desulfurizings, gas liquid ratio is 5.5L/m3Left and right, flue gas SO2Concentration can be from
3500mg/Nm35mg/Nm is more than removed to3Left and right, ton SO21000 yuan or so of cost of removing.Through operation, there is not any knot
Dirty clogging.
Claims (5)
1. a kind of compound fume desulfurizing agent, it is characterised in that the weight/mass percentage composition of its desulfurizing agent is consisted of：
0.5～35% magnesia, 0.5～35% ammonium sulfite, 0.5～35% ammonium sulfate, 0～35% saltcake, 0～
20% ammoniacal liquor, 0.5～15% acylate.
2. the sulfur method of a kind of compound fume desulfurizing agent according to claim 1, it is characterised in that its sweetening process
Step includes：
(1) flue gas desulfurization
Flue gas and desulfurization absorbing liquid haptoreaction, remove the SO in flue gas2, flue gas is purified, desulfurization absorbing liquid is absorbed in flue gas
SO2After become doctor solution；
The desulfurization absorbing liquid is formed with water mixed preparing by composite desulfurizing agent, is combined the matter of fume desulfurizing agent in desulfurization absorbing liquid
Amount degree is 0.5%～15%；
(2) desulfurization regeneration
The doctor solution and ammoniacal liquor stirring reaction, afterwards sedimentation separation, obtain regenerating overflow and regeneration underflow, the regeneration underflow
Recycle in adding to the desulfurization absorbing liquid；
(3) regeneration of regeneration overflow is processed
The regeneration overflow and lime slurry stirring reaction, the mass percent concentration of the lime slurry is 8%～15%, instead
Should filter after terminating, the liquid phase for obtaining is back to step (2), uses as ammoniacal liquor, the solid phase for obtaining is gypsum.
3. a kind of compound fume desulfurizing agent according to claim 1-2, it is characterised in that the acylate is optionally from carboxylic
Hydrochlorate, sulfonate, sulfinate and thionothiolic acid salt.
4. a kind of compound fume desulfurizing agent according to claim 1-2, it is characterised in that the quality of the composite desulfurizing agent
Percentage composition is consisted of：15%～35% magnesia, 15%～35% ammonium sulfite, 15%～35% ammonium sulfate,
15%～35% saltcake, 0.5%～15% acylate.
5. a kind of compound fume desulfurizing agent according to claim 1-2, it is characterised in that the quality of the composite desulfurizing agent
Percentage composition is consisted of：25% magnesia, 25% ammonium sulfite, 25% ammonium sulfate, 20% saltcake, 5% organic
Hydrochlorate.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053742A (en) * | 2007-02-13 | 2007-10-17 | 上海交通大学 | Method for using magnesium compound and ammonia to circulate regeneration flue gas desulfurization |
| CN202161921U (en) * | 2011-06-24 | 2012-03-14 | 龙星化工股份有限公司 | Ammonia regenerative desulphurization device |
| US20120093704A1 (en) * | 2009-03-13 | 2012-04-19 | Ama Soluções Tecnológicas (Amatech) | Ceramic materials for absorption of acidic gases, process of preparing thereof and cyclic process for absorption and regeneration of acidic gases |
| CN102847428A (en) * | 2011-07-01 | 2013-01-02 | 湖南晟通科技集团有限公司 | Limestone-gypsum wet desulfurization additive |
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2016
- 2016-11-07 CN CN201610971533.3A patent/CN106492602A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053742A (en) * | 2007-02-13 | 2007-10-17 | 上海交通大学 | Method for using magnesium compound and ammonia to circulate regeneration flue gas desulfurization |
| US20120093704A1 (en) * | 2009-03-13 | 2012-04-19 | Ama Soluções Tecnológicas (Amatech) | Ceramic materials for absorption of acidic gases, process of preparing thereof and cyclic process for absorption and regeneration of acidic gases |
| CN202161921U (en) * | 2011-06-24 | 2012-03-14 | 龙星化工股份有限公司 | Ammonia regenerative desulphurization device |
| CN102847428A (en) * | 2011-07-01 | 2013-01-02 | 湖南晟通科技集团有限公司 | Limestone-gypsum wet desulfurization additive |
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