CN101239275A - Dual-alkali-gypsum method flue gas desulfurization technique - Google Patents
Dual-alkali-gypsum method flue gas desulfurization technique Download PDFInfo
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- CN101239275A CN101239275A CNA2007101932319A CN200710193231A CN101239275A CN 101239275 A CN101239275 A CN 101239275A CN A2007101932319 A CNA2007101932319 A CN A2007101932319A CN 200710193231 A CN200710193231 A CN 200710193231A CN 101239275 A CN101239275 A CN 101239275A
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- gypsum
- flue gas
- alkali
- gas desulfurization
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Abstract
The present invention provides a process of bimllecular base-plaster method flue gas desulfurization, including using enforce oxydic method process once oxidation of soluble alkaline liquid after being desulfurization in the absorption tower, part doctor solution achieving a certian concentration is send to the reproducer out of the tower and processes secondary oxidation, the fully reactive doctor solution enters the crystallizing pool via sedimentation and concentration to process third oxidation, FGD is obtained via dehydration process after being completely crystallized. The FGD content is improved and grain diameter of the crystal is enhanced, easy to dehydrate and has lower water ratio.
Description
Technical field
The present invention relates to a kind of flue gas desulfurization technique, relate in particular to a kind of pair of alkali-gypsum method flue gas desulfurization technique.
Background technology
At present, usually the double alkali method flue gas desulfurization technology that is adopted all is in the absorption tower sulfur in smoke to be absorbed as absorbent with solubility alkalescence clear liquid earlier, absorption liquid is in tower external application lime or milk of lime regeneration then, absorption liquid after the regeneration loops back the absorption tower and reuses, and the precipitation of generation is carried out processed.But nearly all double alkali method flue gas desulfurization technology all exists sweetening process well oxidation and crystallization, gypsum content is not high in the desulfurization product, generally have only about 10%, major part is very low calcium bisulfite of value and calcium sulfite, and crystal particle diameter is too little, is about 1～5 μ m, causes product dehydration difficulty, moisture content can be given to store, transport and handle the very big problem of all bringing up to 40%.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, provide a kind of can be to two alkali-gypsum method flue gas desulfurization techniques of desulfurization product the efficient oxidation and crystallization.
The present invention has adopted following technical scheme:
Described pair of alkali-gypsum method flue gas desulfurization technique may further comprise the steps:
A kind of pair of alkali-gypsum method flue gas desulfurization technique, comprise with solubility alkalescence clear liquid and in the absorption tower, flue gas is carried out washing desulphurization as absorbent, part reaches the regenerative agent generation displacement reaction that certain density doctor solution is transported to outer regenerated reactor of tower and adding, the desulfurization slurry that reacts completely through precipitate concentrate after, supernatant liquor loops back the absorption tower and uses, lower sediment enters the gypsum dehydration machine and carries out processed, generates desulfurated plaster.
It is characterized in that: comprise following improvement:
1. carry out once oxidation at the absorption tower still with the method for the forced oxidation solubility alkalescence clear liquid after to desulfurization;
2. outside tower, in the regenerated reactor doctor solution is carried out secondary oxidation;
3. be provided with that special gypsum crystallization pond makes regeneration after the gypsum slurries crystallization that concentrates;
4. and in crystallizing pond doctor solution is carried out three oxidations.
Described 1. in the absorption tower still with the method for forced oxidation for blasting air;
It is described that in the regenerated reactor doctor solution to be carried out secondary oxidation in 2. outside tower be to pass through aeration mode;
Described 3. in the gypsum crystallization pond pH value of gypsum slurries be controlled at 6.0～12.0;
Described 3. in the gypsum crystallization pond concentration of gypsum slurries remain on 10～50%;
Described 3. in the gypsum crystallization pond time of staying of gypsum slurries be 5～20h;
It is described that in crystallizing pond doctor solution to be carried out three oxidations in 4. be to pass through aeration mode.
Owing to adopted technique scheme, compared with prior art, the invention has the beneficial effects as follows: gypsum content improves in the desulfurization product, can reach 80%～90%, and crystal particle diameter increases to 10～100 μ m, product dewaters easily, and dehydration back moisture content is less than 10%, and product quality meets commercially available product rock gypsum standard.
Description of drawings
Fig. 1 is a process flow diagram of the present invention
Among the figure: the 1-absorption tower; The 2-regenerated reactor; The 3-concentration basin; 4-desulfurization liquid pool; 5-gypsum crystallization pond; The 6-hydrocyclone; The 7-dewaterer; 8-lime white liquid pool; 9-soda liquid pool; 10,11,12-oxidation fan.
The specific embodiment
Below in conjunction with drawings and the specific embodiments the present invention is described in further detail.
Two alkali-gypsum method flue gas desulfurization techniques as shown in Figure 1, solubility alkalescence clear liquid fully washs the flue gas that enters in absorption tower 1, desulfurization, and drop to the absorption tower still, the tower still is provided with 10 pairs of doctor solutions of forced oxidation equipment and carries out once oxidation, part concentration reaches 20% doctor solution and is delivered to the outer regenerated reactor 2 of tower and carries out displacement reaction with the milk of lime that lime white liquid pool 8 adds, the control pH value is about 8.0, the 11 pairs of desulfurization slurries of oxidation furnaces that are arranged on regenerated reactor simultaneously carry out secondary oxidation, reacted desulfurization slurry enters concentration basin 3 precipitations and concentrates, the supernatant liquor of concentration basin enters desulfurization liquid pool 4, looping back absorption tower 1 after soda liquid pool 9 replenishes the soda mixing uses, lower floor's concentrate pumps into 5 crystallizations of gypsum crystallization pond, the pH value of gypsum slurries is controlled at 6.0 in the gypsum crystallization pond, concentration remains on 15%, in the gypsum crystallization pond time of staying is 5h, and the 12 pairs of gypsum slurries of oxidation furnaces that are arranged on the gypsum crystallization pond carry out three oxidations, oxidizing and crystallizing gypsum slurries completely further concentrates by hydrocyclone 6, top stream clear liquid returns concentration basin 3, underflow density reaches 30% underflow liquid to 7 dehydrations of gypsum dehydration machine, and the generation water content is 9% product gypsum.
Two alkali-gypsum method flue gas desulfurization techniques as shown in Figure 1, solubility alkalescence clear liquid fully washs the flue gas that enters in absorption tower 1, desulfurization, and drop to the absorption tower still, the tower still is provided with 10 pairs of doctor solutions of forced oxidation equipment and carries out once oxidation, part concentration reaches 15% doctor solution and is delivered to the outer regenerated reactor 2 of tower and carries out displacement reaction with the milk of lime that lime white liquid pool 8 adds, the control pH value is about 10.0, the 11 pairs of desulfurization slurries of oxidation furnaces that are arranged on regenerated reactor simultaneously carry out secondary oxidation, reacted desulfurization slurry enters concentration basin 3 precipitations and concentrates, the supernatant liquor of concentration basin enters desulfurization liquid pool 4, looping back absorption tower 1 after soda liquid pool 9 replenishes the soda mixing uses, lower floor's concentrate pumps into 5 crystallizations of gypsum crystallization pond, the pH value of gypsum slurries is controlled at 9.0 in the gypsum crystallization pond, concentration remains on 30%, in the gypsum crystallization pond time of staying is 12h, and the 12 pairs of gypsum slurries of oxidation furnaces that are arranged on the gypsum crystallization pond carry out three oxidations, oxidizing and crystallizing gypsum slurries completely further concentrates by hydrocyclone 6, top stream clear liquid returns concentration basin 3, underflow density reaches 40% underflow liquid to 7 dehydrations of gypsum dehydration machine, and the generation water content is 8% product gypsum.
Two alkali-gypsum method flue gas desulfurization techniques as shown in Figure 1, solubility alkalescence clear liquid fully washs the flue gas that enters in absorption tower 1, desulfurization, and drop to the absorption tower still, the tower still is provided with 10 pairs of doctor solutions of forced oxidation equipment and carries out once oxidation, part concentration reaches 20% doctor solution and is delivered to the outer regenerated reactor 2 of tower and carries out displacement reaction with the milk of lime that lime white liquid pool 8 adds, the control pH value is 11.0, the 11 pairs of desulfurization slurries of oxidation furnaces that are arranged on regenerated reactor simultaneously carry out secondary oxidation, reacted desulfurization slurry enters concentration basin 3 precipitations and concentrates, the supernatant liquor of concentration basin enters desulfurization liquid pool 4, looping back absorption tower 1 after soda liquid pool 9 replenishes the soda mixing uses, lower floor's concentrate pumps into 5 crystallizations of gypsum crystallization pond, the pH value of gypsum slurries is controlled at 12.0 in the gypsum crystallization pond, concentration remains on 45%, in the gypsum crystallization pond time of staying is 18h, and the 12 pairs of gypsum slurries of oxidation furnaces that are arranged on the gypsum crystallization pond carry out three oxidations, oxidizing and crystallizing gypsum slurries completely further concentrates by hydrocyclone 6, top stream clear liquid returns concentration basin 3, underflow density reaches 50% underflow liquid to 7 dehydrations of gypsum dehydration machine, and the generation water content is 6% product gypsum.
Claims (7)
1. two alkali-gypsum method flue gas desulfurization technique, comprise with solubility alkalescence clear liquid and in the absorption tower, flue gas is carried out washing desulphurization as absorbent, part reaches the regenerative agent generation displacement reaction that certain density doctor solution is transported to outer regenerated reactor of tower and adding, the desulfurization slurry that reacts completely through precipitate concentrate after, supernatant liquor loops back the absorption tower and uses, lower sediment enters the gypsum dehydration machine and carries out processed, generates desulfurated plaster.
It is characterized in that: comprise following improvement:
1. carry out once oxidation at the absorption tower still with the method for the forced oxidation solubility alkalescence clear liquid after to desulfurization;
2. outside tower, in the regenerated reactor doctor solution is carried out secondary oxidation;
3. be provided with that special gypsum crystallization pond makes regeneration after the gypsum slurries crystallization that concentrates;
4. and in crystallizing pond doctor solution is carried out three oxidations.
2. a kind of pair of alkali-gypsum method flue gas desulfurization technique according to claim 1 is characterized in that: described 1. in the absorption tower still with the method for forced oxidation for blasting air;
3. a kind of pair of alkali-gypsum method flue gas desulfurization technique according to claim 1 is characterized in that: described in the regenerated reactor doctor solution to be carried out secondary oxidation in 2. outside tower be to pass through aeration mode;
4. a kind of pair of alkali-gypsum method flue gas desulfurization technique according to claim 1 is characterized in that: described 3. in the gypsum crystallization pond pH value of gypsum slurries be controlled at 6.0～12.0;
5. a kind of pair of alkali-gypsum method flue gas desulfurization technique according to claim 1 is characterized in that: described 3. in the gypsum crystallization pond concentration of gypsum slurries remain on 10～50%;
6. a kind of pair of alkali-gypsum method flue gas desulfurization technique according to claim 1 is characterized in that: described 3. in the gypsum crystallization pond time of staying of gypsum slurries be 5～20h;
7. a kind of pair of alkali-gypsum method flue gas desulfurization technique according to claim 1 is characterized in that: described in crystallizing pond doctor solution to be carried out three oxidations in 4. be to pass through aeration mode.
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| CNB2007101932319A CN100537000C (en) | 2007-11-26 | 2007-11-26 | Dual-alkali-gypsum method flue gas desulfurization technique |
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| CN100537000C CN100537000C (en) | 2009-09-09 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085450A (en) * | 2010-12-17 | 2011-06-08 | 秦皇岛双轮环保科技有限公司 | Integrated desulfuration and dust removal method for medium and small boiler flue gas |
| CN102166470A (en) * | 2011-03-09 | 2011-08-31 | 西安西矿环保科技有限公司 | Dual-alkali smoke desulfurization device and desulfurization method thereof |
| CN102430333A (en) * | 2011-10-13 | 2012-05-02 | 山西晋丰节能环保工程设计有限公司 | Selective forced oxidation bialkali-gypsum method desulfurization process |
| CN101703861B (en) * | 2009-08-24 | 2012-07-04 | 李鹏举 | Process and device for desulphurizing flue gas by lime-gypsum method |
| CN102728205A (en) * | 2012-07-20 | 2012-10-17 | 成都德美工程技术有限公司 | Method for flue gas desulfurization by sodium-calcium double alkali method |
| CN102728206A (en) * | 2012-07-20 | 2012-10-17 | 成都德美工程技术有限公司 | Device for flue gas desulfurization by sodium-calcium double alkali method |
| CN103073044A (en) * | 2012-12-25 | 2013-05-01 | 河南民安新型材料有限公司 | Method for preparing desulfurized gypsum in flue gas desulfurization process simulated in laboratory |
| CN107952343A (en) * | 2017-11-24 | 2018-04-24 | 赵扬 | A kind of liquid gas opposite convection type desulfurizing tower twice back and forth |
| CN113117505A (en) * | 2019-12-31 | 2021-07-16 | 苏州安建环保科技有限公司 | Double-alkali flue gas desulfurization and dust removal system |
-
2007
- 2007-11-26 CN CNB2007101932319A patent/CN100537000C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101703861B (en) * | 2009-08-24 | 2012-07-04 | 李鹏举 | Process and device for desulphurizing flue gas by lime-gypsum method |
| CN102085450A (en) * | 2010-12-17 | 2011-06-08 | 秦皇岛双轮环保科技有限公司 | Integrated desulfuration and dust removal method for medium and small boiler flue gas |
| CN102085450B (en) * | 2010-12-17 | 2013-05-29 | 秦皇岛双轮环保科技有限公司 | Integrated desulfuration and dust removal method for medium and small boiler flue gas |
| CN102166470A (en) * | 2011-03-09 | 2011-08-31 | 西安西矿环保科技有限公司 | Dual-alkali smoke desulfurization device and desulfurization method thereof |
| CN102430333A (en) * | 2011-10-13 | 2012-05-02 | 山西晋丰节能环保工程设计有限公司 | Selective forced oxidation bialkali-gypsum method desulfurization process |
| CN102728205A (en) * | 2012-07-20 | 2012-10-17 | 成都德美工程技术有限公司 | Method for flue gas desulfurization by sodium-calcium double alkali method |
| CN102728206A (en) * | 2012-07-20 | 2012-10-17 | 成都德美工程技术有限公司 | Device for flue gas desulfurization by sodium-calcium double alkali method |
| CN103073044A (en) * | 2012-12-25 | 2013-05-01 | 河南民安新型材料有限公司 | Method for preparing desulfurized gypsum in flue gas desulfurization process simulated in laboratory |
| CN107952343A (en) * | 2017-11-24 | 2018-04-24 | 赵扬 | A kind of liquid gas opposite convection type desulfurizing tower twice back and forth |
| CN113117505A (en) * | 2019-12-31 | 2021-07-16 | 苏州安建环保科技有限公司 | Double-alkali flue gas desulfurization and dust removal system |
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| CN100537000C (en) | 2009-09-09 |
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Owner name: SHANXI JINFENG ENERGY SAVING + ENVIRONMENTAL PROTE Free format text: FORMER NAME: SHANXI JINFENG ENVIRONMENTAL PROTECTION ENGINEERING + DESIGNING CO., LTD. |
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Address after: 030032, Shanxi economic and Technological Development Zone, Taiyuan province Wu Luo Street venture building four floor Patentee after: Shanxi Jinfeng Environmental Protection Engineering & Designing Co., Ltd. Address before: 030032, Shanxi economic and Technological Development Zone, Taiyuan province Wu Luo Street venture building four floor Patentee before: Shanxi Jinfeng Environmental Protection Engineering & Designing Co., Ltd. |
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Granted publication date: 20090909 Termination date: 20131126 |