CN108939895A - SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System and its working method - Google Patents
SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System and its working method Download PDFInfo
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- CN108939895A CN108939895A CN201810915339.2A CN201810915339A CN108939895A CN 108939895 A CN108939895 A CN 108939895A CN 201810915339 A CN201810915339 A CN 201810915339A CN 108939895 A CN108939895 A CN 108939895A
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- double alkali
- flue gas
- method desulfurizing
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- slurries
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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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
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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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
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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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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- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
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- Treating Waste Gases (AREA)
Abstract
The present invention relates to SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System and its working method.Currently, the flue gas SO of industrial application3In removing sulfuldioxide, alkaline absorbent spraying technique is widely regarded as important development direction, but there are problems that absorbent higher cost.The present invention includes boiler, economizer, SCR denitration reaction device, atomization jetting device, air preheater, deduster, double alkali method desulfurizing device, chimney and slurries regenerated reactor, boiler, economizer, SCR denitration reaction device, air preheater, deduster, double alkali method desulfurizing device and chimney are sequentially communicated, atomization jetting device is arranged between SCR denitration reaction device and air preheater, atomization jetting device is connected to double alkali method desulfurizing device, and slurries regenerated reactor is also connected to double alkali method desulfurizing device.The present invention is used to remove the SO in flue gas by the desulfurization slurry for generating double alkali method desulfurizing3, to realize while remove the SO in flue gas2With SO3, effectively reduce SO3Remove cost.
Description
Technical field
The present invention relates to SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System and its working method, belong to industry
Waste gas purification environmental protection and energy field.
Background technique
Energy resource structure of the China based on coal will not change within the long duration, therefore, control coal-fired flue-gas pollutant
Discharge is an important process of China's control atmosphere pollution.
Although the current most widely used flue gas desulfurization technique of coal fired power plant flue gas desulfurization device is Gypsum Wet
Desulfurization technology, but there is also system complex, energy and material consumption is higher the disadvantages of, and double alkali method desulfurizing have less scaling, liquid-gas ratio
Smaller, the advantages that limestone utilization is high, therefore also by commonplace concern, double alkali method desulfurizing absorbing reaction such as formula 1-3 institute
Show, regenerative response is as shown in formula 4,5, and oxidation reaction is as shown in formula 6,7.
Na2CO3+SO2→Na2SO3+CO2(1)
Na2SO3+SO2+H2O→2NaHSO3(2)
2NaOH+SO2→Na2SO3+H2O (3)
2NaHSO3+Ca(OH)2→Na2SO3+CaSO3·1/2H2O+3/2H2O (4)
Na2SO3+Ca(OH)2+1/2H2O→2NaOH+CaSO3·1/2H2O (5)
2Na2SO3+O2→2Na2SO4(6)
CaSO3·1/2H2O+1/2O2+3/2H2O→CaSO4·2H2O (7)
On the other hand, enter the flue gas SO of industrial application at present3Removing sulfuldioxide includes alkaline absorbent injection, low temperature electric precipitation
Device, wet electrical dust precipitator etc., wherein alkaline absorbent spraying technique due to removal efficiency is high, have a wide range of application the advantages that, it is wide
It is general to be considered flue gas SO3The important development direction of removing sulfuldioxide, but there are problems that absorbent higher cost.
By analyzing, testing, double alkali method desulfurizing slurries can satisfy SO3Removing process to the quality requirements of absorbent, and
Higher removal efficiency can be reached, reacted as shown in formula 8,9.Therefore the two is combined, is can be realized in comprehensive removing flue gas
SO2With SO3, to realize the effect of collaboration improvement, save the cost, it is of great significance for protection environment.
Na2CO3+SO3→Na2SO4+CO2(8)
2NaHSO3+SO3→Na2SO4+2SO2+H2O (9)
Patent related to the present invention, such as application No. is 201510298152.9 Chinese patents --- " in a kind of removing flue gas
The device and method of sulfur trioxide ", it is to be realized de- by spraying into strong basicity absorbent in the flue before SCR denitration reaction device
Except SO in flue gas3Purpose.But there are high SO for the method3Removal efficiency requires lower absorbent consumption larger, corresponding operating cost compared with
Height, excess absorbent be easy to cause SCR catalyst alkalosis, influence the problems such as dust specific resistance.
For another example application No. is 201310044506.8 Chinese patents --- " oxidation of flue gas three is effectively removed using trona
The device and technique of sulphur ", it is setting nozzle system at the flue between SCR reactor tail portion and air preheater, is sprayed into flue
Enter trona slurries, using the highly basic characteristic of trona to SO3Absorbing and removing is carried out, but still there are absorbent costs to be difficult to control
The problem of processed.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide a kind of reasonable double alkali of design
SO in method desulfurization cooperation-removal flue gas3System and its working method, the SO in flue gas can be removed simultaneously2With SO3, it is effectively reduced
SO3Remove cost.
Technical solution used by the present invention solves the above problems is: SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3
System, which is characterized in that including boiler, economizer, SCR denitration reaction device, atomization jetting device, air preheater, deduster, double
Alkali desulphurization device, chimney and slurries regenerated reactor, it is the boiler, economizer, SCR denitration reaction device, air preheater, deduster, double
Alkali desulphurization device and chimney are sequentially communicated, and the atomization jetting device is arranged between SCR denitration reaction device and air preheater, institute
It states atomization jetting device to be connected to double alkali method desulfurizing device, the slurries regenerated reactor is also connected to double alkali method desulfurizing device.
Furthermore, spray equipment is provided in the double alkali method desulfurizing device, the spray equipment is located at Dual alkali
The top of desulfurizer, the spray equipment are connected to by pipeline with the lower part of double alkali method desulfurizing device.
Furthermore, the bottom of the double alkali method desulfurizing device is provided with desulfurization slurry discharge pipe, regeneration slurries injection
Pipe and lye injection pipe, the double alkali method desulfurizing device pass through desulfurization slurry discharge pipe and regeneration slurry injection tube and slurries respectively
Regenerated reactor connection.
Furthermore, lime stone dispensing port is provided on the slurries regenerated reactor, the bottom of the slurries regenerated reactor is set
It is equipped with gypsum slurries outlet.
SO in a kind of double alkali method desulfurizing cooperation-removal flue gas as described above3System working method, which is characterized in that
The working method is as follows: flue gas from boiler come out after, successively step by step by economizer, SCR denitration reaction device, air preheater, remove
Dirt device and double alkali method desulfurizing device, eventually enter into smoke stack emission；SO when flue gas passes through double alkali method desulfurizing device, in flue gas2
Gas occurs chemical reaction with the desulfurization slurry in double alkali method desulfurizing device and is removed；The ingredient of desulfurization slurry includes NaHSO3
And Na2SO3, a part of desulfurization slurry is entered in atomization jetting device by double alkali method desulfurizing device, to by SCR denitration reaction device
Flue gas later is sprayed, the SO in flue gas3Gas is also removed.
Furthermore, the desulfurization slurry a part being discharged in double alkali method desulfurizing device, which enters in slurries regenerated reactor, to be carried out again
Raw, another part is sprayed into the flue between SCR denitration reaction device and air preheater by atomization jetting device, for removing flue gas
In SO3。
Furthermore, by the way that lime stone solution is added in slurries regenerated reactor, desulfurization slurry is regenerated, after regeneration
Absorbing liquid reenter in double alkali method desulfurizing device, the gypsum slurries of generation enter gypsum cyclone, output gypsum.
Furthermore, desulfurization slurry allocation proportion is according to the SO in flue gas2With SO3Concentration boundary conditions, which are calculated, to be determined.
Compared with prior art, the present invention having the following advantages that and effect: the present invention can remove the SO in flue gas simultaneously2With
SO3, SO can be effectively reduced3Cost is removed, has many advantages, such as that system is simple, energy-saving, application prospect is extensive.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
In figure: boiler 1, economizer 2, SCR denitration reaction device 3, atomization jetting device 4, air preheater 5, deduster 6, double alkali
Method desulfurizer 7, chimney 8, slurries regenerated reactor 9.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System, including boiler 1, economizer 2, SCR be de-
Nitre reactor 3, atomization jetting device 4, air preheater 5, deduster 6, double alkali method desulfurizing device 7, chimney 8 and slurries regenerated reactor 9, pot
Furnace 1, economizer 2, SCR denitration reaction device 3, air preheater 5, deduster 6, double alkali method desulfurizing device 7 and chimney 8 are sequentially communicated, mist
Change injection apparatus 4 to be arranged between SCR denitration reaction device 3 and air preheater 5, atomization jetting device 4 and double alkali method desulfurizing device 7 connect
Logical, slurries regenerated reactor 9 is also connected to double alkali method desulfurizing device 7.
In the present embodiment, spray equipment is provided in double alkali method desulfurizing device 7, spray equipment is located at double alkali method desulfurizing device
7 top, spray equipment are connected to by pipeline with the lower part of double alkali method desulfurizing device 7.
In the present embodiment, the bottom of double alkali method desulfurizing device 7 be provided with desulfurization slurry discharge pipe, regeneration slurry injection tube and
Lye injection pipe, double alkali method desulfurizing device 7 pass through desulfurization slurry discharge pipe and regeneration slurry injection tube and slurries regenerated reactor 9 respectively
Connection.
In the present embodiment, lime stone dispensing port is provided on slurries regenerated reactor 9, the bottom of slurries regenerated reactor 9 is provided with stone
Cream slurry discharge ports.
SO in above-mentioned double alkali method desulfurizing cooperation-removal flue gas3System working method it is as follows: flue gas comes out from boiler 1
Afterwards, successively step by step pass through economizer 2, SCR denitration reaction device 3, air preheater 5, deduster 6 and double alkali method desulfurizing device 7, finally into
Enter the discharge of chimney 8；SO when flue gas passes through double alkali method desulfurizing device 7, in flue gas2In gas and double alkali method desulfurizing device 7
Desulfurization slurry occurs chemical reaction and is removed；The ingredient of desulfurization slurry includes NaHSO3And Na2SO3, partial desulfurization slurries are by double
Alkali desulphurization device 7 enters in atomization jetting device 4, is sprayed to by the flue gas after SCR denitration reaction device 3, flue gas
In SO3Gas is also removed.
The desulfurization slurry a part being discharged in double alkali method desulfurizing device 7, which enters in slurries regenerated reactor 9, to be regenerated, another portion
Divide and sprayed into the flue between SCR denitration reaction device 3 and air preheater 5 by atomization jetting device 4, for removing in flue gas
SO3.By in slurries regenerated reactor 9 be added lime stone solution, desulfurization slurry is regenerated, the absorbing liquid after regeneration again into
Enter in double alkali method desulfurizing device 7, the gypsum slurries of generation enter gypsum cyclone, output gypsum.Desulfurization slurry allocation proportion root
According to the SO in flue gas2With SO3Concentration boundary conditions, which are calculated, to be determined.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (8)
1. SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System, which is characterized in that including boiler, economizer, SCR denitration
Reactor, atomization jetting device, air preheater, deduster, double alkali method desulfurizing device, chimney and slurries regenerated reactor, the boiler, province
Coal device, SCR denitration reaction device, air preheater, deduster, double alkali method desulfurizing device and chimney are sequentially communicated, the atomized spray dress
It installs between SCR denitration reaction device and air preheater, the atomization jetting device is connected to double alkali method desulfurizing device, the slurry
Liquid regenerated reactor is also connected to double alkali method desulfurizing device.
2. SO in double alkali method desulfurizing cooperation-removal flue gas according to claim 13System, which is characterized in that double alkali
Spray equipment is provided in method desulfurizer, the spray equipment is located at the top of double alkali method desulfurizing device, the spray equipment
It is connected to by pipeline with the lower part of double alkali method desulfurizing device.
3. SO in double alkali method desulfurizing cooperation-removal flue gas according to claim 13System, which is characterized in that double alkali
The bottom of method desulfurizer is provided with desulfurization slurry discharge pipe, regeneration slurry injection tube and lye injection pipe, and the Dual alkali is de-
Sulphur device passes through desulfurization slurry discharge pipe respectively and regeneration slurry injection tube is connected to slurries regenerated reactor.
4. SO in double alkali method desulfurizing cooperation-removal flue gas according to claim 13System, which is characterized in that the slurries
Lime stone dispensing port is provided on regenerated reactor, the bottom of the slurries regenerated reactor is provided with gypsum slurries outlet.
5. SO in a kind of double alkali method desulfurizing cooperation-removal flue gas as claimed in any one of claims 1-43System
Working method, which is characterized in that the working method is as follows: flue gas from boiler come out after, successively step by step by economizer,
SCR denitration reaction device, air preheater, deduster and double alkali method desulfurizing device, eventually enter into smoke stack emission；When flue gas passes through Dual alkali
SO when desulfurizer, in flue gas2Gas occurs chemical reaction with the desulfurization slurry in double alkali method desulfurizing device and is removed；It is de-
The ingredient of sulphur slurries includes NaHSO3And Na2SO3, desulfurization slurry is entered in atomization jetting device by double alkali method desulfurizing device, to warp
The flue gas crossed after SCR denitration reaction device is sprayed, the SO in flue gas3Gas is also removed.
6. SO in double alkali method desulfurizing cooperation-removal flue gas according to claim 53System working method, feature exists
In the desulfurization slurry a part being discharged in double alkali method desulfurizing device, which enters in slurries regenerated reactor, to be regenerated, and another part passes through
Atomization jetting device sprays into the flue between SCR denitration reaction device and air preheater, for removing the SO in flue gas3。
7. SO in double alkali method desulfurizing cooperation-removal flue gas according to claim 63System working method, feature exists
In, by slurries regenerated reactor be added lime stone solution, desulfurization slurry is regenerated, the absorbing liquid after regeneration reenters
In double alkali method desulfurizing device, the gypsum slurries of generation enter gypsum cyclone, output gypsum.
8. SO in double alkali method desulfurizing cooperation-removal flue gas according to claim 63System working method, feature exists
In desulfurization slurry allocation proportion is according to the SO in flue gas2With SO3Concentration boundary conditions, which are calculated, to be determined.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810915339.2A CN108939895A (en) | 2018-08-13 | 2018-08-13 | SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System and its working method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915339.2A CN108939895A (en) | 2018-08-13 | 2018-08-13 | SO in a kind of double alkali method desulfurizing cooperation-removal flue gas3System and its working method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4267156A (en) * | 1979-07-11 | 1981-05-12 | The Foundation At New Jersey Institute Of Technology | Method using lime slurry for regenerating sodium sulfite in double alkali flue gas desulfurization process |
| CN2825082Y (en) * | 2005-10-10 | 2006-10-11 | 施耀 | Double-circulating double-alkali processed wet type desulfurization device |
| CN203955018U (en) * | 2014-05-15 | 2014-11-26 | 鞍山创新废酸除硅再生工程有限公司 | A kind of spray roasting acid regeneration is containing sour exhaust gas purification system |
| CN106000037A (en) * | 2016-07-06 | 2016-10-12 | 北京国电龙源环保工程有限公司 | System and method for removing acid gas in smoke and assisting in desulfurization and denitrification |
| CN208975522U (en) * | 2018-08-13 | 2019-06-14 | 华电电力科学研究院有限公司 | The system of SO3 in a kind of double alkali method desulfurizing cooperation-removal flue gas |
-
2018
- 2018-08-13 CN CN201810915339.2A patent/CN108939895A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4267156A (en) * | 1979-07-11 | 1981-05-12 | The Foundation At New Jersey Institute Of Technology | Method using lime slurry for regenerating sodium sulfite in double alkali flue gas desulfurization process |
| CN2825082Y (en) * | 2005-10-10 | 2006-10-11 | 施耀 | Double-circulating double-alkali processed wet type desulfurization device |
| CN203955018U (en) * | 2014-05-15 | 2014-11-26 | 鞍山创新废酸除硅再生工程有限公司 | A kind of spray roasting acid regeneration is containing sour exhaust gas purification system |
| CN106000037A (en) * | 2016-07-06 | 2016-10-12 | 北京国电龙源环保工程有限公司 | System and method for removing acid gas in smoke and assisting in desulfurization and denitrification |
| CN208975522U (en) * | 2018-08-13 | 2019-06-14 | 华电电力科学研究院有限公司 | The system of SO3 in a kind of double alkali method desulfurizing cooperation-removal flue gas |
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