CN201419077Y - Separation-type sodium-calcium double alkali method smoke gas desulfurizing device - Google Patents

Separation-type sodium-calcium double alkali method smoke gas desulfurizing device Download PDF

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Publication number
CN201419077Y
CN201419077Y CN2008201388565U CN200820138856U CN201419077Y CN 201419077 Y CN201419077 Y CN 201419077Y CN 2008201388565 U CN2008201388565 U CN 2008201388565U CN 200820138856 U CN200820138856 U CN 200820138856U CN 201419077 Y CN201419077 Y CN 201419077Y
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tower
dechlorination
fluorine
sodium
alkali
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CN2008201388565U
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李鹏举
张晓玲
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Shanxi Jinfeng Environmental Protection Engineering & Designing Co., Ltd.
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Shanxi Jinfeng Environmental Protection Engineering & Designing Co Ltd
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Abstract

The utility model discloses a sodium-calcium double alkali method smoke gas desulfurizing device, and is characterized in that processing systems are respectively arranged for C1<->, F<-> and SO2 in smoke gas, and clear water and sodium alkali are used as absorbent for removing C1<->, F<-> and SO2 in smoke gas. Clear water absorbent is recycled in a dechlorinating /defluorinating tower during thedechlorinating / defluorinating process, and when pH value of absorption liquid is smaller than 2, a part of absorption liquid is sent out the tower for doing neutralization process. The sodium-calcium double alkali method is adopted in the desulfurizing process, sodium alkali is used as absorbent in an absorption tower, and the sodium alkali absorption liquid is regenerated by using calcium alkali outside the tower. The dechlorinating /defluorinating tower of the device can effectively remove most C1<-> and F<-> in smoke gas and 40%-80% dust, effectively avoids disadvantage affects of C1<-> and F<-> in smoke gas and heavy metal ions in the dust to subsequent desulfurizing systems, reduces the lost of sodium alkali along with the discharge of waste water, and reduces operation expenses.

Description

Separate type flue gas desulfurization by sodium-calcium dual-alkali scrubbing method device
Technical field
The utility model relates to a kind of flue gas desulfur device, relates in particular to a kind of device of flue gas desulfurization by sodium-calcium dual-alkali scrubbing method.
Background technology
At present, wet type limestone/lime-gypsum method is occupied an leading position in current flue gas desulfurization technique, but easy fouling of desulfurizing tower even obstruction.In order to overcome the shortcoming of easy fouling of limestone/lime-gypsum wet method and obstruction, two alkaline process have been developed.This method absorbs SO with the alkaline clear liquid of solubility as absorbent earlier 2, and then with milk of lime or lime absorption liquid is regenerated, soda is constantly recycling.But in absorption liquid recycles, contain a spot of Cl in the flue gas -And F -Also be absorbed liquid and wash, and constantly accumulation.Cl -And F -Concentration constantly increases, and brings following adverse effect: (1) from the angle of absorption liquid intermediate ion balance, anionic increasing can cause effective Na in the absorption liquid relatively +Reduction, influence SO 2Absorption efficiency; (2) reduce the pH of absorption liquid, caused the decline and the CaSO of desulfurization degree 4The increase of fouling tendency; (3) influence quality of desulphurization gypsum; (4) corrosion strengthens the desulfurization absorption liquid to desulphurization plant, when concentration reaches certain value, needs the discharging desulfurization wastewater, causes the loss of soda.Simultaneously, the price of soda is high more a lot of than calcium alkali, and the consumption of soda is a higher main cause of dual alkali scrubbing FGD process operating cost.
Summary of the invention
The utility model provides a kind of separate type flue gas desulfurization by sodium-calcium dual-alkali scrubbing method device, it is characterized in that at SO 2Set up flue gas dechlorination/fluorine system before the absorption system, this system comprises dechlorination/fluorine tower, circulating pump, reaction tank, dewaterer and drawing pump, flue gas dechlorination/fluorine tower and dual alkali scrubbing FGD process system are connected in series, dechlorination/fluorine tower is provided with the fresh water (FW) moisturizing and takes over, pump inlet is communicated with dechlorination/fluorine Tata still, spraying layer in circulating-pump outlet and the dechlorination/fluorine tower is communicated with, and dechlorination/fluorine tower, drawing pump, reaction tank and dewaterer be connected in series, and the dewaterer filtrate (liquid is connected with dechlorination/fluorine tower.Dechlorination/fluorine tower can effectively remove most Cl in the flue gas -And F -And 40%～80% flue dust, effectively avoided Cl in the flue gas -And F -And heavy metal ion reduces the loss of soda with discharge of wastewater to the adverse effect of follow-up desulphurization system in the flue dust, reduces operating cost.
The flue gas that comes out from deduster enters in the tower from dechlorination/fluorine tower bottom, and the clear water absorbent is constantly circulation in dechlorination/fluorine tower, fully contacts with flue gas, and the HCl in the flue gas, HF are washed.Be dissociated into H rapidly after gaseous state HCl, HF in the flue gas is water-soluble +, Cl -And F -Thereby, finish Cl -And F -Remove.The flue gas of cleaning is discharged from dechlorination/fluorine tower top relatively, enters calcium and sodium double alkali method desulfurizing tower main body then.In desulfurizing tower, adopt soda to make absorbent and absorb SO 2, and then with lime absorption liquid is regenerated, with SO 2Separate out with calcium sulfite or calcium sulfate form precipitation, it is recycling that the soda after the regeneration returns absorption system, and the real desulfurizing agent that consumes is a lime.The waste water of sending from dechlorination/fluorine tower bottom in dechlorination/fluorine system that contains acidic materials pumps into reaction tank through drawing pump, adjust pH value of waste water 7～9 by adding lime, and lime is with the F in the waste water -And the dissolubility heavy metal ion is (such as Fe 3+, Zn 2+, Cu 2+) generation CaF 2Reach indissoluble materials such as iron hydroxide, zinc hydroxide, these indissoluble things concentrate in the reaction tank bottom.Reaction tank upper strata waste water then can directly discharge, and the concentrated lime-ash of reaction tank bottom discharges after by dewaterer, and it is recycling that filtrate then passes back into dechlorination/fluorine tower.Replenish fresh water (FW) to remedy smoke evaporative and discharging consume water to dechlorination/fluorine tower simultaneously.
In this separate type flue gas desulfurization by sodium-calcium dual-alkali scrubbing method system running, the pH value of clear water absorption liquid can descend gradually in dechlorination/fluorine tower, when reducing to 2～3, only removes HCl, HF and flue dust in the flue gas, to SO 2No assimilation effect when the pH value answers the submitting portion absorption liquid to carry out neutralisation treatment less than 2 the time, replenishes fresh water (FW) simultaneously in dechlorination/fluorine tower.
The absorbent of spray is a clear water in this separate type flue gas desulfurization by sodium-calcium dual-alkali scrubbing method device, dechlorination/fluorine tower, and liquid-gas ratio is 0.5～3L/m in the tower 3, the form of dechlorination/fluorine tower can adopt void tower, plate column, bubble tower and tubulent contact tower.
Main chemical reactions in dechlorination/fluorine tower is as follows:
HCl(g)＝HCl(aq)
HF(g)＝HF(aq)
HCl(aq)+H 2O＝H 3O ++Cl -
HF(aq)+H 2O＝H 3O ++F -
Main chemical reactions in the desulfurizing tower is as follows:
Na 2CO 3+SO 2＝Na 2SO 3+CO 2↑
2NaOH+SO 2＝Na 2SO 3+H 2O
Figure Y20082013885600041
SO 2The regeneration of absorption solution process is as follows:
Figure Y20082013885600042
Na 2SO 3+Ca(OH) 2＝2NaOH+CaSO 3
The utility model is with SO in the flue gas 2Absorption and Cl -, F -Absorption in different towers, finish respectively, effectively remove the Cl in the flue gas by dechlorination/fluorine system was set before desulfurizing tower -And F -, and 40%～80% dust; Obtain decline through dechlorination/fluorine tower flue gas temperature simultaneously, helped SO in the follow-up desulfurizing tower 2Remove and protect anticorrosive coat in the tower; And in the follow-up desulphurization system slurries because Cl -And F -Content reduces its wastewater discharge and reduces, and can effectively reduce the loss of soda with waste water row, reduces operating cost.
Description of drawings
Fig. 1 is the utility model separate type flue gas desulfurization by sodium-calcium dual-alkali scrubbing method schematic representation of apparatus.
Among the figure: 1-dechlorination/fluorine tower; The 2-fresh water (FW); The 3-circulating pump; The 4-reaction tank; The 5-dewaterer; The 6-drawing pump.
The specific embodiment
Introduce the specific embodiment of the present utility model below in conjunction with drawings and Examples.
As shown in the figure, the flue gas that comes out of deduster is earlier by dechlorination/fluorine system removal Cl wherein -, F -With most of flue dust, enter desulfurizing tower again and carry out desulfurization.Dechlorination/fluorine system comprises dechlorination/fluorine tower (1), circulating pump (3), drawing pump (6), slag slurry dewaterer (5) and reaction tank (4).This dechlorination/fluorine tower (1) adopts the form of void tower, makees absorbent with clear water in the tower, and flue gas enters the absorbent counter current contacting of Ta Nei and top spray from the tower bottom import, thereby removes Cl wherein -, F -With most of flue dust, the flue gas of cleaning is discharged from dechlorination/fluorine tower (1) top relatively, enters double alkali method desulfurizing tower main body then.Dechlorination/fluorine tower (1) inner control gas speed 4m/s, the control liquid-gas ratio is 2L/m 3, wash time is 1.5s.The clear water absorption liquid of dechlorination/fluorine tower (1) bottom recycles in tower by circulating pump (3), fully contacts with flue gas.When the pH of absorption liquid value less than 2 the time by the reaction tank (4) of drawing pump (6) submitting portion absorption liquid to dechlorination/fluorine tower, replenish fresh water (FW) (2) to dechlorination/fluorine tower (1) simultaneously and remedy smoke evaporative and discharging consume water.In reaction tank (4), regulate the pH to 7 of waste water～9 by adding lime, simultaneously the F in lime and the waste water -And the dissolubility heavy metal ion is (such as Fe 3+, Zn 2+, Cu 2+) generation CaF 2Reach indissoluble materials such as iron hydroxide, zinc hydroxide, these indissoluble things concentrate in reaction tank (4) bottom, reaction tank (4) upper strata waste water then can directly discharge, and reaction tank (4) bottom concentrates lime-ash by the discharging of dewaterer (5) back, and it is recycling that filtrate then passes back into dechlorination/fluorine tower (1).This dechlorination/fluorine tower (1) can remove 90% Cl -And F -And 80% flue dust, in the follow-up desulphurization system slurries because Cl -And F -Content reduces its wastewater discharge and reduces, and can effectively reduce the loss of soda with discharge of wastewater.The flue-gas temperature of coming from deduster is 120 ℃, reduces to 80 ℃ by dechlorination/fluorine tower (1) back flue-gas temperature, by increasing flue gas dechlorination/fluorine system, can effectively reduce flue-gas temperature, helps SO in the follow-up desulfuration absorbing tower 2Remove and protect anticorrosive coat in the tower.

Claims (2)

1. separate type flue gas desulfurization by sodium-calcium dual-alkali scrubbing method device is characterized in that at SO 2Set up flue gas dechlorination/fluorine system before the absorption system, this system comprises dechlorination/fluorine tower (1), circulating pump (3), reaction tank (4), dewaterer (5) and drawing pump (6), flue gas dechlorination/fluorine tower and dual alkali scrubbing FGD process system are connected in series, dechlorination/fluorine tower (1) is provided with the fresh water (FW) moisturizing and takes over, circulating pump (3) import is communicated with dechlorination/fluorine Tata still, the interior spraying layer of circulating pump (3) outlet and dechlorination/fluorine tower (1) is communicated with, and dechlorination/fluorine tower (1), drawing pump (6), reaction tank (4) and dewaterer (5) are connected in series, and dewaterer (5) filtrate (liquid is connected with dechlorination/fluorine tower (1).
2. separate type flue gas desulfurization by sodium-calcium dual-alkali scrubbing method device according to claim 1 is characterized in that the absorbent of spray in dechlorination/fluorine tower (1) is a clear water, and liquid-gas ratio is 0.5～3L/m in the tower 3, the form of dechlorination/fluorine tower can adopt void tower, plate column, bubble tower and tubulent contact tower.
CN2008201388565U 2008-10-09 2008-10-09 Separation-type sodium-calcium double alkali method smoke gas desulfurizing device Expired - Fee Related CN201419077Y (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179151A (en) * 2011-03-31 2011-09-14 四川鑫星铝业有限责任公司 Alkali liquor wet purification technology for aluminum melting furnace smoke
CN102284238A (en) * 2010-06-21 2011-12-21 中国石油化工股份有限公司 Bialkali-method flue-gas desulphurization process
CN102350176A (en) * 2011-09-07 2012-02-15 四川明晶光电科技有限公司 Method for treating fluoride waste water and gas
CN104128081A (en) * 2014-07-18 2014-11-05 蒙自矿冶有限责任公司 Method for removing F and Cl in flue gas by using waste acid
CN105457492A (en) * 2015-12-28 2016-04-06 安徽理工大学 Method for dechlorinating desulfurization slurry with ammonium sulfate-limestone method
CN109589750A (en) * 2019-01-04 2019-04-09 许世民 Fluorine technique is gone in a kind of economical desulfurization of aluminium electrolytic flue

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102284238A (en) * 2010-06-21 2011-12-21 中国石油化工股份有限公司 Bialkali-method flue-gas desulphurization process
CN102179151A (en) * 2011-03-31 2011-09-14 四川鑫星铝业有限责任公司 Alkali liquor wet purification technology for aluminum melting furnace smoke
CN102350176A (en) * 2011-09-07 2012-02-15 四川明晶光电科技有限公司 Method for treating fluoride waste water and gas
CN104128081A (en) * 2014-07-18 2014-11-05 蒙自矿冶有限责任公司 Method for removing F and Cl in flue gas by using waste acid
CN105457492A (en) * 2015-12-28 2016-04-06 安徽理工大学 Method for dechlorinating desulfurization slurry with ammonium sulfate-limestone method
CN109589750A (en) * 2019-01-04 2019-04-09 许世民 Fluorine technique is gone in a kind of economical desulfurization of aluminium electrolytic flue

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Owner name: SHANXI JINFENG ENERGY CONSERVATION + ENVIRONMENTAL

Free format text: FORMER NAME: SHANXI JINFENG ENVIRONMENTAL PROTECTION ENGINEERING + DESIGNING CO., LTD.

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Address after: 030032, Taiyuan economic and Technological Development Zone, Shanxi province Wu Luo Street venture building four floor

Co-patentee after: Li Pengju

Patentee after: Shanxi Jinfeng Environmental Protection Engineering & Designing Co., Ltd.

Address before: 030032, Taiyuan economic and Technological Development Zone, Shanxi province Wu Luo Street venture building four floor

Co-patentee before: Li Pengju

Patentee before: Shanxi Jinfeng Environmental Protection Engineering & Designing Co., Ltd.

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Granted publication date: 20100310

Termination date: 20131009