CN105311946A - Flue gas denitration and desulfuration washing system and denitration and desulfuration method - Google Patents

Flue gas denitration and desulfuration washing system and denitration and desulfuration method Download PDF

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Publication number
CN105311946A
CN105311946A CN201510900407.4A CN201510900407A CN105311946A CN 105311946 A CN105311946 A CN 105311946A CN 201510900407 A CN201510900407 A CN 201510900407A CN 105311946 A CN105311946 A CN 105311946A
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denitration
tower
doctor solution
liquid
desulfurizing tower
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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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Priority to CN201510900407.4A priority Critical patent/CN105311946A/en
Priority to PCT/CN2016/070847 priority patent/WO2017096692A1/en
Publication of CN105311946A publication Critical patent/CN105311946A/en
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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
    • 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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • B01D53/96—Regeneration, reactivation or recycling of reactants

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a flue gas denitration and desulfuration washing system belonging to the field of chemical engineering, and provides a system capable of achieving denitration and desulfuration simultaneously. The washing system comprises a desulfuration tower, a denitration tower, a tower connection pipe, a desulfuration liquid discharging pipe, a denitration liquid discharging pipe and a desulfuration tower waste liquid discharging pipe. The system has the beneficial effects that the system capable of achieving denitration and desulfuration simultaneously can be provided, furthermore, desulfuration liquid and denitration liquid in the two systems can be shared with each other, so that the cost is saved greatly, and the efficiency is improved.

Description

A kind of denitrating flue gas desulfurization washing system and denitration sulfur method
Technical field
The invention belongs to chemical field, specifically a kind of denitrating flue gas desulfurization washing system.
Background technology
SO 2be two kinds of main gaseousness atmosphere pollutions with NOx, they produce primarily of burning or other chemical process and with fume emission in air.
The desulfurization of flue gas mainly contains wet method and dry method two class at present, and dry method uses lime slurry to spray into desulfurizing tower, and under the effect of high-temperature flue gas, the water in slurries evaporates very soon, and the lime in slurries is separated out with the form of solid particle, and by the SO in flue gas 2be adsorbed on its surface to be removed; Adsorb SO 2solid lime particle then together with the dust in flue gas, by the removing of sack cleaner below; Wet desulphurization then uses rarer lime liquor wash-out SO in spray column 2, the interpolation of lime is added according to the control overflow of pH, pH general control about 6 acid range.SO 2first be absorbed into aqueous phase, in water, form sulfurous acid and and CaCO 3(or Ca (OH) 2) reaction generates, calcium sulfite and calcium bisulfite and calcium sulfate, except lime or lime stone, the basic matterial as flue gas desulfurization also has NaOH, ammoniacal liquor, MgO etc.
The denitration of flue gas is divided into reducing process and oxidizing process two class, and reducing process uses ammonia or urea as reducing agent, uses V 5o 2as catalyst under the temperature conditions of 300-400 DEG C, or do not use catalyst under the temperature conditions of 1000 DEG C by the NO in flue gas xoptionally be reduced into nitrogen.Selective catalytic reduction is owing to needing to use the catalyst containing transition metal, catalyst can be subject to the wearing and tearing 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 NO xdischarge standard, thus its use is also restricted.And oxidation rule uses ozone and H 2o 2in oxidant by NO xin NO (account for NO in flue gas xmore than 90%) be oxidized to the NO of easier wash-out 2or N 2o 5(NO 2account for more than 90%), and and flue gas in SO 2remove in wet scrubber tower together.Oxidizing process denitration due to technique simple, without the need to using catalyst, Applicable temperature scope is wide, therefore in use cost and applicability, has some superiority.
Due to NO 2and SO 2washing be suitable for absorbent and acceptance condition on difference, NO 2in the SO2 absorption tower of routine, clean result is poor, can not meet the requirement of producing upper denitration, SO 2due to soluble in water, so its absorptance is in a liquid very fast, generate H very soon 2sO 3, and H 2sO 3can react with the much alkali lye comprising soda and lime, therefore, the many alkali lye comprising NaOH and lime can as SO 2absorbent.And NO 2absorption in a liquid wants complicated many, on the one hand by NO 2hydrolysis absorb, generate product HNO 2and HNO 3, Na on the other hand 2sO 3with EDTA etc. as absorbent, also participate in and NO on gas-liquid surface 2reaction, affects NO 2absorption, simultaneously these alkaline matters also with the nitric acid generated and nitrous acid generation neutralization reaction.The existence of NaOH is to NO 2absorption rate do not affect, but SO 2with the product Na of NaOH 2sO 3to NO 2serve absorption, and use Na 2sO 3when making absorbent, SO 2existence to NO 2absorption play inhibitory action.This shows, use alkaline matter as NaOH do desulfurization absorbent time, its product sulfite ion can carry out NO 2absorb, thus likely in desulfurizing tower, carry out desulphurization denitration simultaneously.But, due to the SO in flue gas 2and NO 2concentration is change, and its composition also has larger luffing, and the absorption rate is simultaneously also very different, the soak time that desulfurization often only needs about 2 seconds, and denitration needs the many time longer than desulfurization, therefore to realize simultaneously stability substantially impossible.
Summary of the invention
For solving the above-mentioned problem mentioned, the invention provides the system of the desulfurization simultaneously of an energy and denitration, saved cost, also achieved the protection to environment, for realizing this object, the technical solution used in the present invention is as follows:
A kind of denitrating flue gas desulfurization washing system, described washing system includes desulfurizing tower, denitrating tower, tower tube connector, 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 Inner eycle, 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 denitration liquid circulation pipe for making denitration liquid use in denitrating tower Inner eycle 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;
Be provided with tower tube connector between described desulfurizing tower and denitrating tower, tower tube connector entrance is positioned at desulfurizing tower top, and the outlet of tower tube connector is positioned at bottom denitrating tower;
Described doctor solution circulation pipe also connects for extracting desulfurization waste liquor and sent into the doctor solution comb of denitrating tower bottom desulfurizing tower, doctor solution comb entrance is positioned at bottom denitrating tower, described doctor solution comb is provided with the desulfurization waste liquor by-pass valve control being disposed to denitration pipe for reacted doctor solution, 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 with for discharging the denitration liquid comb of denitration liquid to desulfurizing tower from denitrating tower, and described denitration liquid comb is provided with denitration liquid comb by-pass valve control 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 mouth from doctor solution and adds in desulfurizing tower, desulfuration recycle pump takes out doctor solution at the bottom of desulfurizing tower, and doctor solution upwards flows along doctor solution circulation pipe and exports pouring from doctor solution circulation pipe, desulfurization; Preferably, described doctor solution also comprises Ca (OH) 2.
In desulfurizing tower, but their interpolation adds according to the change of pH, employing be control pH
Method control the addition of doctor solution, the control range of the doctor solution pH after inhaling sulphur in tower is
6-9, desulphurization reaction equation is as follows:
SO 2+H 2O→H 2SO 3；
H 2SO 3+2NaOH→Na 2SO 3+2H 2O；
Na 2SO 3+H 2SO 3→2NaHSO 3；
NaHSO 3+NaOH→Na 2SO 3+H 2O；
Na 2SO 3+1/2O 2→Na 2SO 4。
2) flue gas after desulfurization enters denitrating tower denitration by tower tube connector, includes NaOH and Na 2sO 3denitration liquid from denitration liquid add mouth add in denitrating tower, in desulfurizing tower, in denitration liquid, the content of NaOH is 0.1-1WT%, Na 2sO 3for 0.01-0.5mol/L, denitration circulating pump extracts denitration liquid bottom denitration pipe, and denitration liquid upwards flows along denitration liquid circulation pipe and exports pouring from denitration liquid circulation pipe, denitration;
Containing SO 2and NO 2waste gas first enter desulfurizing tower, SO 2naOH reaction first and in desulfurizing tower generates Na 2sO 3, part Na 2sO 3can be used for further and SO 2reaction generates NaHSO 3, and both all can generate Na with the oxygen reaction in flue gas 2sO 4, be the mixed liquor of three in this waste liquid, wherein Na 2sO 3can account for the 20-40% of total salt, because the time of staying of the flue gas of desulfurizing tower is short, in desulfurizing tower, general denitration effect is limited, remaining SO 2with the NO of the overwhelming majority 2along with flue gas enters denitrating tower below, in the denitration liquid denitration of the higher concentration that denitrating tower is added, NO 2effectively removed.Alkali lye containing higher concentration in liquid after the reaction of denitrating tower, is back to desulfurizing tower, is used as supplementing desulfurizing tower alkali lye NAOH.
3) gas after desulphurization denitration is discharged from exhanst gas outlet.
Further, in step 2) in, as the Na in denitration liquid 2sO 3content lower than 0.01mol/L time, denitration liquid also can adopt other alkaline matter, and reacted doctor solution enters doctor solution comb along doctor solution circulation pipe, enters in denitrating tower, work as Na by doctor solution comb 2sO 3content higher than 0.5mol/L time, close desulfurization waste liquor by-pass valve control.
Further, in step 1) in, as Na in reacted doctor solution 2sO 3during too high levels, reacted doctor solution is discharged from desulfurizing tower discharging of waste liquid pipe, and in order to maintain the concentration of the salt in desulfurizing tower, a part of doctor solution in other words reacted doctor solution is drained as waste water, some enters denitrating tower below, containing Na in reacted doctor solution 2sO 3, be used for supplementary denitration liquid, be discharged to the flow of the shunting in denitrating tower according to Na 2sO 3concentration and enter the NO of the gas in denitrating tower 2concentration decides, and 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 by denitration comb and supply NaOH in desulfurizing tower, in order to control the total salt concentration in denitration liquid, also must drain 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, for supplementary disengaging liquid.
Beneficial effect of the present invention is, the system of energy denitration desulfurization while of providing a kind of, and the doctor solution between two systems and denitration liquid can share mutually, provide cost savings greatly, improve efficiency.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
1. smoke inlet; 2. desulfurizing tower; 3. tower tube connector; 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 by-pass valve control; 11. doctor solutions add mouth; 12. denitration circulating pumps; 13. denitration liquid circulation pipes; 14. denitration liquid combs; 15. denitration liquid comb by-pass valve controls; 16. denitration liquids add mouth; 11.Desulfurizing tower discharging of waste liquid tube valve.
Detailed description of the invention
Embodiment 1
Please refer to Fig. 1, a kind of denitrating flue gas desulfurization washing system, described washing system includes desulfurizing tower 2, denitrating tower 4, tower tube connector 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 Inner eycle, 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 also provided with doctor solution and adds mouth 11,
Described denitrating tower 4 is provided with denitration liquid circulation pipe 13 for making denitration liquid use in denitrating tower 4 Inner eycle 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;
Be provided with tower tube connector 3 between described desulfurizing tower 2 and denitrating tower 4, tower tube connector 3 entrance is positioned at desulfurizing tower 2 top, and tower tube connector 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 also connects and is used for extracting desulfurization waste liquor bottom desulfurizing tower 2 and the doctor solution comb 8 being sent into 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 by-pass valve control 10 being disposed to denitration pipe for reacted doctor solution, 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 with for discharging the denitration liquid comb 14 of denitration liquid to desulfurizing tower 2 from denitrating tower, and described denitration liquid comb 14 is provided with denitration liquid comb by-pass valve control 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
The present invention also provides 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 mouth 11 from doctor solution and adds in desulfurizing tower 2, desulfuration recycle pump 6 takes out doctor solution from desulfurizing tower 2 end, and doctor solution upwards flows along doctor solution circulation pipe 7 and exports pouring from doctor solution circulation pipe 7, desulfurization; Preferably, described doctor solution also comprises Ca (OH) 2; As Na in reacted doctor solution 2sO 3during 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, a part of doctor solution in other words reacted doctor solution is drained as waste water, some enters denitrating tower below, containing Na in reacted doctor solution 2sO 3, be used for supplementary denitration liquid, be discharged to the flow of the shunting in denitrating tower according to Na 2sO 3concentration and enter the NO of the gas in denitrating tower 2concentration decides, and be in general the 10-50% of desulfurizing tower circulation fluid, also must drain 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 14, for supplementary disengaging liquid.
In desulfurizing tower 2, but their interpolation adds according to the change of pH, employing be the method for control pH to control the addition of doctor solution, the control range of inhaling the doctor solution pH after sulphur in tower is 6-9, and desulphurization reaction equation is as follows:
SO 2+H 2O→H 2SO 3；
H 2SO 3+2NaOH→Na 2SO 3+2H 2O；
Na 2SO 3+H 2SO 3→2NaHSO 3；
NaHSO 3+NaOH→Na 2SO 3+H 2O；
Na 2SO 3+1/2O 2→Na 2SO 4。
2) flue gas after desulfurization enters denitrating tower 4 denitration by tower tube connector 3, includes NaOH and Na 2sO 3denitration 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%, Na 2sO 3for 0.01-0.5mol/L, denitration circulating pump 12 extracts denitration liquid bottom denitration pipe, and denitration liquid upwards flows along denitration liquid circulation pipe 13 and exports pouring from denitration liquid circulation pipe 13, denitration;
Containing SO 2and NO 2waste gas first enter desulfurizing tower 2, SO 2naOH reaction first and in desulfurizing tower generates Na 2sO 3, part Na 2sO 3can be used for further and SO 2reaction generates NaHSO 3, and both all can generate Na with the oxygen reaction in flue gas 2sO 4, be the mixed liquor of three in this waste liquid, wherein Na 2sO 3can account for the 20-40% of total salt, because the time of staying of the flue gas of desulfurizing tower is short, in desulfurizing tower, general denitration effect is limited, remaining SO 2with the NO of the overwhelming majority 2along with flue gas enters denitrating tower below, in the denitration liquid denitration of the higher concentration that denitrating tower is added, NO 2effectively removed.Alkali lye containing higher concentration in liquid after the reaction of denitrating tower, is back to desulfurizing tower, is used as supplementing desulfurizing tower alkali lye NAOH; As the Na in denitration liquid 2sO 3content lower than 0.01mol/L time, denitration liquid also can adopt other alkaline matter, and reacted doctor solution enters doctor solution comb 8 along doctor solution circulation pipe 7, enters in denitrating tower, work as Na by doctor solution comb 8 2sO 3content higher than 0.5mol/L time, close desulfurization waste liquor by-pass valve control 10.
3) gas after desulphurization denitration is discharged from exhanst gas outlet 5.

Claims (9)

1. a denitrating flue gas desulfurization washing system, is characterized in that, described washing system includes desulfurizing tower, denitrating tower, tower tube connector, 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 Inner eycle, 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 also provided with doctor solution and adds mouth;
Described denitrating tower is provided with denitration liquid circulation pipe for making denitration liquid use in denitrating tower Inner eycle 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;
Be provided with tower tube connector between described desulfurizing tower and denitrating tower, tower tube connector entrance is positioned at desulfurizing tower top, and the outlet of tower tube connector is positioned at denitrating tower middle and lower part;
Described doctor solution circulation pipe also connects for extracting desulfurization waste liquor and sent into the doctor solution comb of denitrating tower bottom desulfurizing 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 by-pass valve control being disposed to denitration pipe for reacted doctor solution, 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 with for discharging the denitration liquid comb of denitration liquid to desulfurizing tower from denitrating tower, and described denitration liquid comb is provided with denitration liquid comb by-pass valve control.
2. washing system as claimed in claim 1, it is characterized in that, described desulfurizing tower is spray column or venturi absorption tower.
3. washing system as claimed in claim 1, it is characterized in that, described denitrating tower is packed column or spray column.
4. washing system as claimed in claim 1, it is characterized in that, described smoke inlet is positioned at the middle and lower part of desulfurizing tower.
5. a denitrating flue gas sulfur method, is characterized in that, described method comprises the steps,
1) flue gas enters desulfurization in desulfurizing tower from smoke inlet, the doctor solution including NaOH adds mouth from doctor solution and adds in desulfurizing tower, desulfuration recycle pump takes out doctor solution at the bottom of desulfurizing tower, and doctor solution upwards flows along doctor solution circulation pipe and exports pouring from doctor solution circulation pipe, desulfurization;
2) flue gas after desulfurization enters denitrating tower denitration by tower tube connector, includes NaOH and Na 2sO 3denitration liquid from denitration liquid add mouth add in denitrating tower, in desulfurizing tower, in denitration liquid, the content of NaOH is 0.1-1WT%, Na 2sO 3for 0.01-0.5mol/L, denitration circulating pump extracts denitration liquid bottom denitration pipe, and denitration liquid upwards flows along denitration liquid circulation pipe and exports pouring from denitration liquid circulation pipe, denitration;
3) gas after desulphurization denitration is discharged from exhanst gas outlet.
6. denitration sulfur method as claimed in claim 5, it is characterized in that, described doctor solution also comprises Ca (OH) 2.
7. denitration sulfur method as claimed in claim 5, is characterized in that, in step 2) in, as the Na in denitration liquid 2sO 3content lower than 0.01mol/L time, reacted doctor solution enters doctor solution comb along doctor solution circulation pipe, enters in denitrating tower, work as Na by doctor solution comb 2sO 3content higher than 0.5mol/L time, close desulfurization waste liquor by-pass valve control.
8. denitration sulfur method as claimed in claim 5, is characterized in that, in step 1) in, as Na in reacted doctor solution 2sO 3during too high levels, reacted doctor solution is discharged from desulfurizing tower discharging of waste liquid pipe.
9. denitration sulfur method as claimed in claim 4, is characterized in that, in step 1) in, denitration liquid enters denitration liquid comb from denitration liquid circulation pipe from denitrating tower, is entered in desulfurizing tower supply NaOH in desulfurizing tower by denitration comb.
CN201510900407.4A 2015-12-09 2015-12-09 Flue gas denitration and desulfuration washing system and denitration and desulfuration method Pending CN105311946A (en)

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CN201510900407.4A CN105311946A (en) 2015-12-09 2015-12-09 Flue gas denitration and desulfuration washing system and denitration and desulfuration method
PCT/CN2016/070847 WO2017096692A1 (en) 2015-12-09 2016-01-14 Fuel gas denitration and desulfurization washing system and denitration and desulfurization method

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CN109589766A (en) * 2018-12-17 2019-04-09 湖北蔚天环保科技有限公司 Ultra-low temperature denitration device combined with dual-alkali desulfurization process
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CN109718653A (en) * 2019-02-14 2019-05-07 中国石油大学(北京) A kind of flue gas desulfurization and denitrification device and method
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