CN205361029U - Flue gas denitration desulfurization washing system - Google Patents

Flue gas denitration desulfurization washing system Download PDF

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Publication number
CN205361029U
CN205361029U CN201521014010.7U CN201521014010U CN205361029U CN 205361029 U CN205361029 U CN 205361029U CN 201521014010 U CN201521014010 U CN 201521014010U CN 205361029 U CN205361029 U CN 205361029U
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tower
denitration
doctor solution
desulfurizing tower
circulation pipe
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朱核光
熊靓
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Cestoil Chemical Inc
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Cestoil Chemical Inc
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Abstract

The utility model provides a flue gas denitration desulfurization washing system, the utility model belongs to the chemical industry field, the utility model provides a system of individual desulfurization simultaneously and denitration, washing system including desulfurizing tower, denitrating tower, tower connecting pipe, doctor solution calandria, denitration liquid calandria and desulfurizing tower waste liquid delivery pipe, the beneficial effects of the utility model reside in that, a desulfurated system of ability denitration simultaneously is provided, moreover, doctor solution and denitration liquid between two systems can share each other, and the great cost of having saved has improved efficiency.

Description

A kind of denitrating flue gas desulfurization washing system
Technical field
This utility model belongs to chemical field, specifically a kind of denitrating flue gas desulfurization washing system.
Background technology
SO2With the gaseousness atmosphere pollution that NOx is two kinds main, they are mainly produced and with in fume emission to air by burning or other chemical process.
The desulfurization of flue gas currently mainly has wet method and dry method two class, and dry method uses lime slurry to spray into desulfurizing tower, and under the effect of high-temperature flue gas, the water in serosity quickly evaporates, and the Calx in serosity precipitates out with the form of solid particle, and by the SO in flue gas2It is adsorbed on its surface to be removed;Adsorb SO2Solid lime particle then together with the dust in flue gas, removed by sack cleaner below;Wet desulphurization then uses rarer lime liquor eluting SO in spray column2, adding of Calx requires to add according to the control of pH, pH general control about 6 acid range.SO2First it is absorbed into aqueous phase, water is formed sulfurous acid and CaCO3(or Ca (OH)2) react generation, calcium sulfite and calcium bisulfite and calcium sulfate, except Calx or limestone, the basic matterial as flue gas desulfurization also has NaOH, ammonia, MgO etc..
The denitration of flue gas is divided into reducing process and oxidizing process two class, and reducing process uses ammonia or carbamide as reducing agent, uses V5O2As catalyst under the temperature conditions of 300-400 DEG C, or do not use catalyst by the NO in flue gas under the temperature conditions of 1000 DEG CxOptionally it is reduced into nitrogen.Selective catalytic reduction is owing to needing the use catalyst containing transition metal, catalyst can be subject to the abrasion of dust in flue gas and need frequent replacing, there is the problem such as NH_3 leakage and temperature conditions harshness simultaneously, its use is subject to certain restrictions, and SNCR rule denitration effect cannot meet strict NOxDischarge standard, thus its use is also restrained.And oxidation rule uses ozone and H2O2Deng oxidant by NOxIn NO (account for NO in flue gasxMore than 90%) be oxidized to the NO being easier to eluting2Or N2O5(NO2Account for more than 90%), and and flue gas in SO2Remove in wet scrubber tower together.Oxidizing process denitration is simple due to technique, it is not necessary to use catalyst, and Applicable temperature scope is wide, therefore has some superiority in use cost and the suitability.
Due to NO2And SO2Washing difference on applicable absorbent and acceptance condition, NO2In conventional SO2 absorption tower, clean result is poor, it is impossible to meet the requirement producing upper denitration, SO2Due to soluble in water, so its absorptance in a liquid is very fast, quickly generate H2SO3, and H2SO3Can reacting with many alkali liquor including soda and Calx, therefore, the many alkali liquor including NaOH and Calx can act as SO2Absorbent.And NO2Absorbing in a liquid wants complicated many, on the one hand by NO2Hydrolysis absorb, generate product HNO2And HNO3, Na on the other hand2SO3With EDTA etc. as absorbent, also participate in and NO on gas-liquid surface2Reaction, affects NO2Absorption, simultaneously these alkaline matters also occur to neutralize reaction with the nitric acid generated and nitrous acid.The existence of NaOH is to NO2Absorption rate do not affect, but SO2Product Na with NaOH2SO3To NO2Serve Absorption, and use Na2SO3When doing absorbent, SO2Existence to NO2Absorption play inhibitory action.This shows, uses alkaline matter when such as NaOH does desulfurization absorbent, and its product sulfite ion can carry out NO2Absorb, it is possible to carry out desulphurization denitration in desulfurizing tower simultaneously.But, due to the SO in flue gas2And NO2Concentration is change, and its composition also has a bigger luffing, and the absorption rate of both is also very different simultaneously, the soak time that desulfurization often only needs about 2 seconds, and denitration needs the many time longer than desulfurization, and therefore to realize absorbing substantially impossible simultaneously.
Utility model content
For solving problem mentioned above, this utility model provides the system of an energy desulfurization simultaneously and denitration, has saved cost, has also achieved the protection to environment, and for realizing this purpose, the technical solution adopted in the utility model is as follows:
A kind of denitrating flue gas desulfurization washing system, described washing system includes desulfurizing tower, denitrating tower, tower connecting tube, doctor solution comb, denitration liquid comb and desulfurizing tower discharging of waste liquid pipe,
Described desulfurizing tower is provided with smoke inlet and the doctor solution circulation pipe for making doctor solution use in desulfurizing tower internal recycle, described doctor solution circulation pipe entrance is positioned at bottom desulfurizing tower, desulfurizing tower top is located in the outlet of doctor solution circulation pipe, described doctor solution circulation pipe is provided with the desulfuration recycle pump for extracting doctor solution, and described doctor solution circulation pipe is provided with doctor solution and adds mouth;
Described denitrating tower is provided with the denitration liquid circulation pipe for making denitration liquid use in denitrating tower internal recycle and exhanst gas outlet, described denitration liquid circulation pipe entrance is positioned at bottom denitrating tower, the outlet of denitration liquid circulation pipe is positioned at denitration pipe top, described denitration liquid circulation pipe is provided with the denitration circulating pump for extracting denitration liquid, described denitration liquid circulation pipe is provided with denitration liquid and adds mouth, and described exhanst gas outlet is located at the top of denitrating tower;
Being provided with tower connecting tube between described desulfurizing tower and denitrating tower, tower connecting tube entrance is positioned at desulfurizing tower top, and the outlet of tower connecting tube is positioned at bottom denitrating tower;
Described doctor solution circulation pipe is also connected with for extracting desulfurization waste liquor bottom desulfurizing tower and being sent to the doctor solution comb of denitrating tower, doctor solution comb entrance is positioned at bottom denitrating tower, described doctor solution comb is provided with the desulfurization waste liquor for reacted doctor solution discharge to denitration pipe and controls valve, described doctor solution comb connects the desulfurizing tower discharging of waste liquid pipe for discharging desulfurization waste liquor, and described desulfurizing tower discharging of waste liquid pipe is provided with desulfurizing tower discharging of waste liquid tube valve;
Described denitration liquid circulation pipe is connected to for discharging the denitration liquid denitration liquid comb to desulfurizing tower from denitrating tower, and described denitration liquid comb is provided with denitration liquid row's tube control flap 15.
Further, described desulfurizing tower is spray column or venturi absorption tower.
Further, described denitrating tower be packed column or spray column.
Further, described smoke inlet be positioned at the middle and lower part of desulfurizing tower.
A kind of denitrating flue gas sulfur method, described method comprises the steps,
1) flue gas enters desulfurization in desulfurizing tower from smoke inlet, the doctor solution including NaOH adds in mouth addition desulfurizing tower from doctor solution, desulfuration recycle pump is from taking out doctor solution at the bottom of desulfurizing tower, doctor solution flows up along doctor solution circulation pipe and drenches from the outlet of doctor solution circulation pipe, and desulfurization;Preferably, described doctor solution also includes Ca (OH)2
In desulfurizing tower, but their interpolation is to add according to the change of pH, employing be the method controlling pH to control the addition of doctor solution, the span of control inhaling the doctor solution pH after sulfur in tower is 6-9, and desulphurization reaction equation is as follows:
SO2+H2O→H2SO3;
H2SO3+2NaOH→Na2SO3+2H2O;
Na2SO3+H2SO3→2NaHSO3
NaHSO3+NaOH→Na2SO3+H2O;
Na2SO3+1/2O2→Na2SO4
2) flue gas after desulfurization enters denitrating tower denitration by tower connecting tube, includes NaOH and Na2SO3Denitration liquid add mouth from denitration liquid and add in denitrating tower, in desulfurizing tower, in denitration liquid, the content of NaOH is 0.1-1WT%, Na2SO3For 0.01-0.5mol/L, denitration circulating pump extracts denitration liquid bottom denitration pipe, denitration liquid flows up along denitration liquid circulation pipe and drenches from the outlet of denitration liquid circulation pipe, and denitration;
Containing SO2And NO2Waste gas initially enter desulfurizing tower, SO2NaOH reaction first and in desulfurizing tower generates Na2SO3, part Na2SO3Can be used for further and SO2Reaction generates NaHSO3, and both all can react with the oxygen in flue gas and generate Na2SO4, this waste liquid is the mixed liquor of three, wherein Na2SO3Can accounting for the 20-40% of total salt, owing to the time of staying of the flue gas of desulfurizing tower is short, in desulfurizing tower, general denitration effect is limited, remaining SO2NO with the overwhelming majority2Along with flue gas enters denitrating tower below, at the denitration liquid denitration of the higher concentration that denitrating tower is added, NO2Effectively removed.Liquid contains after the reaction of denitrating tower the alkali liquor of higher concentration, is back to desulfurizing tower, be used as supplementing desulfurizing tower alkali liquor NAOH.
3) gas after desulphurization denitration is discharged from exhanst gas outlet.
Further, in step 2) in, as the Na in denitration liquid2SO3Content lower than 0.01mol/L time, denitration liquid can also adopt other alkaline matter, and reacted doctor solution enters doctor solution comb along doctor solution circulation pipe, doctor solution comb enter in denitrating tower, work as Na2SO3Content higher than 0.5mol/L time, close desulfurization waste liquor control valve.
Further, in step 1) in, as Na in reacted doctor solution2SO3During too high levels, reacted doctor solution goes out from desulfurizing tower discharging of waste liquid bank of tubes, and in order to maintain the concentration of the salt in desulfurizing tower, the doctor solution reacted doctor solution in other words of a part is drained as waste water, some enters denitrating tower below, containing Na in reacted doctor solution2SO3, it being used for supplementing denitration liquid, the flow of the shunting being discharged in denitrating tower is according to Na2SO3Concentration and enter the NO of gas in denitrating tower2Concentration determines, is in general the 10-50% of desulfurizing tower circulation fluid.
Further, in step 1) in, denitration liquid enters denitration liquid comb from denitration liquid circulation pipe from denitrating tower, entered in desulfurizing tower to supplying NaOH in desulfurizing tower by denitration comb, in order to control the total salt concentration in denitration liquid, it is also necessary to draining a certain amount of reacted denitration liquid, reacted denitration liquid contains the NaOH of higher concentration, can enter in desulfurizing tower through denitration liquid comb, depart from liquid for supplementing.
The beneficial effects of the utility model are in that, it is provided that the system of energy denitration desulfurization while of a kind of, and, doctor solution and denitration liquid between two systems can share mutually, greatly provide cost savings, improve efficiency.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present utility model.
1. smoke inlet;2. desulfurizing tower;3. tower connecting tube;4. denitrating tower;5. exhanst gas outlet;6. desulfuration recycle pump;7. doctor solution circulation pipe;8. doctor solution comb;9. desulfurizing tower discharging of waste liquid pipe;10. desulfurization waste liquor controls valve;11. doctor solution adds mouth;12. denitration circulating pump;13. denitration liquid circulation pipe;14. denitration liquid comb;15. denitration liquid row's tube control flap;16. denitration liquid adds mouth;11.Desulfurizing tower discharging of waste liquid tube valve.
Detailed description of the invention
Embodiment 1
Refer to Fig. 1, a kind of denitrating flue gas desulfurization washing system, described washing system includes desulfurizing tower 2, denitrating tower 4, tower connecting tube 3, doctor solution comb 8, denitration liquid comb 14 and desulfurizing tower discharging of waste liquid pipe 9, described desulfurizing tower 2 is provided with smoke inlet 1 and the doctor solution circulation pipe 7 for making doctor solution use in desulfurizing tower 2 internal recycle, described doctor solution circulation pipe 7 entrance is positioned at desulfurizing tower bottom, desulfurizing tower 2 top is located in doctor solution circulation pipe 7 outlet, described doctor solution circulation pipe 7 is provided with the desulfuration recycle pump 6 for extracting doctor solution, described doctor solution circulation pipe 7 is additionally provided with doctor solution and adds mouth 11;
Described denitrating tower 4 is provided with the denitration liquid circulation pipe 13 for making denitration liquid use in denitrating tower 4 internal recycle and exhanst gas outlet 5, described denitration liquid circulation pipe 13 entrance is positioned at bottom denitrating tower 4, denitration liquid circulation pipe 13 outlet is positioned at denitration pipe top, described denitration liquid circulation pipe 13 is provided with the denitration circulating pump 12 for extracting denitration liquid, described denitration liquid circulation pipe 13 is provided with denitration liquid and adds mouth 16, and described exhanst gas outlet 5 is located at the top of denitrating tower 4;
Being provided with tower connecting tube 3 between described desulfurizing tower 2 and denitrating tower 4, tower connecting tube 3 entrance is positioned at desulfurizing tower 2 top, and tower connecting tube 3 outlet is positioned at denitrating tower 4 middle and lower part, on the liquid level of denitration liquid;
Described doctor solution circulation pipe 7 is also connected with for extracting desulfurization waste liquor bottom desulfurizing tower 2 and being sent to the doctor solution comb 8 of denitrating tower 4, doctor solution comb 8 entrance is positioned at denitrating tower 4 middle and lower part, described doctor solution comb 8 is provided with the desulfurization waste liquor for reacted doctor solution discharge to denitration pipe and controls valve 10, described doctor solution comb 8 connects the desulfurizing tower 2 discharging of waste liquid pipe for discharging desulfurization waste liquor, and described desulfurizing tower 2 discharging of waste liquid pipe is provided with desulfurizing tower discharging of waste liquid tube valve 11;
Described denitration liquid circulation pipe 13 is connected to for discharging the denitration liquid denitration liquid comb 14 to desulfurizing tower 2 from denitrating tower, and described denitration liquid comb 14 is provided with denitration liquid row's tube control flap 15.
Described desulfurizing tower 2 can be spray column or venturi absorption tower.
Described denitrating tower 4 can be packed column or spray column.
Described smoke inlet 1 is positioned at the middle and lower part of desulfurizing tower 2, on the liquid level of doctor solution.
Embodiment 2
This utility model also provides for a kind of denitrating flue gas sulfur method, and described method comprises the steps,
1) flue gas enters desulfurization in desulfurizing tower 2 from smoke inlet 1, the doctor solution including NaOH adds in desulfurizing tower 2 from doctor solution interpolation mouth 11, desulfuration recycle pump 6 takes out doctor solution from desulfurizing tower 2 end, doctor solution flows up along doctor solution circulation pipe 7 and drenches from doctor solution circulation pipe 7 outlet, and desulfurization;Preferably, described doctor solution also includes Ca (OH)2;As Na in reacted doctor solution2SO3During too high levels, reacted doctor solution is discharged from desulfurizing tower discharging of waste liquid pipe 9, and in order to maintain the concentration of the salt in desulfurizing tower, the doctor solution reacted doctor solution in other words of a part is drained as waste water, some enters denitrating tower below, containing Na in reacted doctor solution2SO3, it being used for supplementing denitration liquid, the flow of the shunting being discharged in denitrating tower is according to Na2SO3Concentration and enter the NO of gas in denitrating tower2Concentration determines, is in general the 10-50% of desulfurizing tower circulation fluid, it is also necessary to draining a certain amount of reacted denitration liquid, reacted denitration liquid contains the NaOH of higher concentration, it is possible to enter in desulfurizing tower through denitration liquid comb 14, departs from liquid for supplementing.
In desulfurizing tower 2, but their interpolation is to add according to the change of pH, employing be the method controlling pH to control the addition of doctor solution, the span of control inhaling the doctor solution pH after sulfur in tower is 6-9, and desulphurization reaction equation is as follows:
SO2+H2O→H2SO3;
H2SO3+2NaOH→Na2SO3+2H2O;
Na2SO3+H2SO3→2NaHSO3;
NaHSO3+NaOH→Na2SO3+H2O;
Na2SO3+1/2O2→Na2SO4。
2) flue gas after desulfurization enters denitrating tower 4 denitration by tower connecting tube 3, includes NaOH and Na2SO3Denitration liquid from denitration liquid add mouth 16 add in denitrating tower 4, in desulfurizing tower 2, in denitration liquid, the content of NaOH is 0.1-1WT%, Na2SO3For 0.01-0.5mol/L, denitration circulating pump 12 extracts denitration liquid bottom denitration pipe, denitration liquid flows up along denitration liquid circulation pipe 13 and drenches from denitration liquid circulation pipe 13 outlet, and denitration;
Containing SO2And NO2Waste gas initially enter desulfurizing tower 2, SO2NaOH reaction first and in desulfurizing tower generates Na2SO3, part Na2SO3Can be used for further and SO2Reaction generates NaHSO3, and both all can react with the oxygen in flue gas and generate Na2SO4, this waste liquid is the mixed liquor of three, wherein Na2SO3Can accounting for the 20-40% of total salt, owing to the time of staying of the flue gas of desulfurizing tower is short, in desulfurizing tower, general denitration effect is limited, remaining SO2NO with the overwhelming majority2Along with flue gas enters denitrating tower below, at the denitration liquid denitration of the higher concentration that denitrating tower is added, NO2Effectively removed.Liquid contains after the reaction of denitrating tower the alkali liquor of higher concentration, is back to desulfurizing tower, be used as supplementing desulfurizing tower alkali liquor NAOH;As the Na in denitration liquid2SO3Content lower than 0.01mol/L time, denitration liquid can also adopt other alkaline matter, and reacted doctor solution enters doctor solution comb 8 along doctor solution circulation pipe 7, doctor solution comb 8 enter in denitrating tower, work as Na2SO3Content higher than 0.5mol/L time, close desulfurization waste liquor control valve 10.
3) gas after desulphurization denitration is discharged from exhanst gas outlet 5.

Claims (3)

1. a denitrating flue gas desulfurization washing system, it is characterised in that described washing system includes desulfurizing tower, denitrating tower, tower connecting tube, doctor solution comb, denitration liquid comb and desulfurizing tower discharging of waste liquid pipe,
Described desulfurizing tower is provided with smoke inlet and the doctor solution circulation pipe for making doctor solution use in desulfurizing tower internal recycle, described doctor solution circulation pipe entrance is positioned at desulfurizing tower bottom, desulfurizing tower top is located in the outlet of doctor solution circulation pipe, described doctor solution circulation pipe is provided with the desulfuration recycle pump for extracting doctor solution, described doctor solution circulation pipe is additionally provided with doctor solution and adds mouth;
Described denitrating tower is provided with the denitration liquid circulation pipe for making denitration liquid use in denitrating tower internal recycle and exhanst gas outlet, described denitration liquid circulation pipe entrance is positioned at bottom denitrating tower, the outlet of denitration liquid circulation pipe is positioned at denitration pipe top, described denitration liquid circulation pipe is provided with the denitration circulating pump for extracting denitration liquid, described denitration liquid circulation pipe is provided with denitration liquid and adds mouth, and described exhanst gas outlet is located at the top of denitrating tower;
Being provided with tower connecting tube between described desulfurizing tower and denitrating tower, tower connecting tube entrance is positioned at desulfurizing tower top, and the outlet of tower connecting tube is positioned at denitrating tower middle and lower part;
Described doctor solution circulation pipe is also connected with for extracting desulfurization waste liquor bottom desulfurizing tower and being sent to the doctor solution comb of denitrating tower, doctor solution comb entrance is positioned at denitrating tower middle and lower part, described doctor solution comb is provided with the desulfurization waste liquor for reacted doctor solution discharge to denitration pipe and controls valve, described doctor solution comb connects the desulfurizing tower discharging of waste liquid pipe for discharging desulfurization waste liquor, and described desulfurizing tower discharging of waste liquid pipe is provided with desulfurizing tower discharging of waste liquid tube valve;
Described denitration liquid circulation pipe is connected to for discharging the denitration liquid denitration liquid comb to desulfurizing tower from denitrating tower, and described denitration liquid comb is provided with denitration liquid row's tube control flap.
2. washing system as claimed in claim 1, it is characterised in that described desulfurizing tower is spray column or venturi absorption tower.
3. washing system as claimed in claim 1, it is characterised in that described denitrating tower is packed column or spray column.
CN201521014010.7U 2015-12-09 2015-12-09 Flue gas denitration desulfurization washing system Active CN205361029U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105311946A (en) * 2015-12-09 2016-02-10 深圳广昌达环境科学有限公司 Flue gas denitration and desulfuration washing system and denitration and desulfuration method
CN106345250A (en) * 2016-08-29 2017-01-25 中石化炼化工程(集团)股份有限公司 Ultralow emission process for catalytic cracking smoke

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105311946A (en) * 2015-12-09 2016-02-10 深圳广昌达环境科学有限公司 Flue gas denitration and desulfuration washing system and denitration and desulfuration method
WO2017096692A1 (en) * 2015-12-09 2017-06-15 深圳广昌达环境科学有限公司 Fuel gas denitration and desulfurization washing system and denitration and desulfurization method
CN106345250A (en) * 2016-08-29 2017-01-25 中石化炼化工程(集团)股份有限公司 Ultralow emission process for catalytic cracking smoke

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