CN102423617A - Method of preventing scaling of desulphurization equipment and pipelines used in dual-alkali desulphurization process - Google Patents
Method of preventing scaling of desulphurization equipment and pipelines used in dual-alkali desulphurization process Download PDFInfo
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- CN102423617A CN102423617A CN2011102562512A CN201110256251A CN102423617A CN 102423617 A CN102423617 A CN 102423617A CN 2011102562512 A CN2011102562512 A CN 2011102562512A CN 201110256251 A CN201110256251 A CN 201110256251A CN 102423617 A CN102423617 A CN 102423617A
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Abstract
The invention discloses a method of preventing scaling of desulphurization equipment and pipelines used in the dual-alkali desulphurization process. The method is characterized in that: an ion exchanger is added into the step of regeneration of desulphurization liquid in the dual-alkali desulphurization process, and the ion exchange resin of the ion exchanger is sodium type cation exchange resin. According to the invention, the ion exchanger is added into the step of regeneration of desulphurization liquid in the dual-alkali desulphurization process to adsorb calcium ions in regenerated aqueous alkali, which blocks calcium ions in regenerated aqueous alkali from entering into a desulfurization tower and can effectively prevent scaling of desulphurization equipment and pipelines used in the dual-alkali desulphurization process.
Description
Technical field
The present invention relates to the flue gases purification field, particularly relate to a kind of method that prevents desulphurization plant and pipeline scale in the double alkali method desulfurizing technology.
Background technology
Fouling is that wet desulfurizing process comprises one of major reason that causes the equipment stoppage in transit in the wet type lime/lime stone law technology, influences desulphurization system security and stability.In the wet type limestone desulfurization system that the U.S. 80 mid-nineties 90s of 20th century built in the past, fouling in various degree occurred in many, demisters inner on the absorption tower and the slurry pipe line, sulphur coal power plant is especially serious.
By contrast, two alkaline process absorb SO with alkaline clear liquid as absorbent earlier
2, and then with alkaline solutions such as lime slurries absorption liquid is regenerated.Owing in smoke absorption and absorption liquid processing, used two kinds of dissimilar alkali, be called two alkaline process.Sodalime double alkali method is for problems such as the wearing and tearing that solve desulfurizing tower and circulating line, obstruction and foulings; And absorbing cyclic process employing liquid phase soda (sodium sulfite, NaOH or sodium carbonate) as absorbent, there are not problems such as fouling and slurry obstruction in theory.
Yet in actual motion, if misoperation, fouling still often takes place in the double alkali method desulfurizing system, and what have is also very serious.In the double alkali method desulfurizing system, possibly cause that the material of fouling mainly contains three kinds: calcium carbonate, calcium sulfite and calcium sulfate.The fouling main cause is after the partial desulfurization absorption liquid gets into regenerated reactor; After having added lime; Calcium ion concentration increases in the solution, has separated out a large amount of calcium sulfites and calcium sulfate, because the problem of precipitate and separate system effectiveness; Cause the supersaturation calcium sulfite and the calcium sulfate mixture of part low concentration to get in the desulfurizing tower, thereby make fouling become possibility.The method that tradition solves fouling is to reduce measures such as desulfurizing tower recirculation water pH value and adding organic additive; These measures all have certain inhibitory action to fouling; But because the composition fluctuation of different parts doctor solution and regeneration alkali lye is bigger; Mechanism of scaling is difference to some extent, be difficult to confirm suitable organic acid addition and for regulating the best soda acid amount that pH adds, and these additives possibly have a negative impact to the by-produced gypsum quality.
Summary of the invention
The present invention is directed to the actual engineering problem of existing double alkali method desulfurizing technology, a kind of method that can effectively prevent desulphurization plant and pipeline scale in the double alkali method desulfurizing technology is provided.
The technical scheme that the present invention adopts is: a kind of method that prevents desulphurization plant and pipeline scale in the double alkali method desulfurizing technology; It is characterized in that: desulfurization regeneration partly increases ion-exchanger in double alkali method desulfurizing technology, and the ion exchange resin of ion-exchanger is sodium type cationic ion-exchange resin.
The circulating water pipeline of desulfurization regeneration part, overflow pipe inwall and regenerative system pool wall adopt corrosion-resistant, smooth surface and anti-to be stained with sticking strong alloy or the non-metallic material of ability in double alkali method desulfurizing technology.
At least two of described ion-exchangers, one opens one is equipped with.
Said ion exchange resin adopts dilution heat of sulfuric acid regeneration, and said dilution heat of sulfuric acid concentration is 0.5 wt% ~ 5 wt%.
The present invention gets into the desulfurizing tower circulation section through the calcium ion that increases ion-exchanger blocking-up regeneration aqueous slkali, fundamentally stops in the doctor solution SO in the calcium ion and flue gas
2And CO
2Form the possibility of depositions such as various calcium sulfate, calcium sulfite and calcium carbonate; Simultaneously, adopt smooth, anti-perhaps organic pipeline conveying such as other liner rubber, the polyethylene regeneration alkali lye of the strong alloy material of sticking ability of being stained with of inner surface, guarantee that the tower outer circulation is unobstructed, to reach the purpose of desulphurization system smooth long term running.
The present invention's desulfurization regeneration in double alkali method desulfurizing technology partly increases the calcium ion of ion-exchanger absorption regeneration aqueous slkali, and the calcium ion of having blocked the regeneration aqueous slkali gets into desulfurizing tower, can effectively prevent desulphurization plant and pipeline scale in the double alkali method desulfurizing technology.
Description of drawings
Accompanying drawing 1 is a process flow diagram of the present invention;
Wherein, the 1st, alkali liquid tank; The 2nd, chimney; The 3rd, the returning charge pond; The 4th, ion-exchanger; The 5th, exchanger resin regenerated acid flow container; The 6th, exchanger resin regenerated liquid surge tank; The 7th, desulfurizing tower; The 8th, pulping tank; The 9th, the alkali liquid regeneration pond; The 10th, horizontal sedimentation tank; The 11st, hydrocyclone.
The specific embodiment
According to accompanying drawing and instantiation the present invention is described further as follows below:
By technological process shown in Figure 1.When desulfurizer starts with NaOH as absorbent, in the NaOH dry mash adding alkali liquid tank, add water and be mixed with sodium hydroxide lye.Alkali lye is driven in the returning charge pond; Squeeze into by pump and to carry out desulfurization in the desulfurizing tower; After doctor solution fully contacts, reacts with flue gas in the absorption tower; Ash discharge ditch through tower body bottom cycle section passes back into mixing pit, and the doctor solution and the lime slurry that flow into mixing pit carry out regenerative response, and lime slurry is formed by pulverized limestone that adds in the pulping tank and water mixed preparing.Because can the loss part sodium hydroxide in the residue of draining, so, in alkali liquid tank, can regularly carry out replenishing of NaOH, with the normal operation that guarantees whole desulphurization system and the qualified discharge of flue gas.Desulfurizing agent solution after the regeneration fully precipitates the big particle of assurance through three grades of sedimentation basins is not returned tower body.
The present invention has adopted two ion-exchangers, and every treating capacity is 400 t/h, and one opens one is equipped with.An ion-exchanger needs about 7200 L sodium type cationic ion-exchange resins, and the resin replacing time is 4 ~ 7 years.An ion-exchanger platform run duration, another is subsequent use with acid solution flushing regeneration back.The ion exchange resin operation of absorption calcium ion regularly detected the alkali lye after exchanging after 2 ~ 3 days.If calcium ion concentration obviously raises, must carry out periodic flushing regeneration to regenerating ion exchange resin with dilution heat of sulfuric acid (0.5 wt% ~ 5 wt%), dilution heat of sulfuric acid can be through the preparation of exchanger resin regenerated acid flow container.Solution after the regeneration exchange contains a large amount of calcium ions, can deliver to follow-up concentrated, centrifugal and dry workshop section with the slurries of settling tank, produces by-produced gypsum.
The conveyance conduit of the outer doctor solution of the tower of desulfurization regeneration part and regenerated liquid and rinse solution adopts corrosion-resistant, smooth surface and anti-being stained with to glue strong alloy or the non-metallic material of ability in technology of the present invention, like plating Na Feier alloy material.
Embodiment of the present invention only is the description that preferred implementation of the present invention is carried out; Be not that design of the present invention and scope are limited; Under the prerequisite that does not break away from design philosophy of the present invention, engineers and technicians make technical scheme of the present invention in this area various modification and improvement all should fall into protection scope of the present invention; The technology contents that the present invention asks for protection all is documented in claims.
Claims (4)
1. method that prevents desulphurization plant and pipeline scale in the double alkali method desulfurizing technology, it is characterized in that: desulfurization regeneration partly increases ion-exchanger in double alkali method desulfurizing technology, and the ion exchange resin of ion-exchanger is sodium type cationic ion-exchange resin.
2. method according to claim 1 is characterized in that: the circulating water pipeline of desulfurization regeneration part, overflow pipe inwall and regenerative system pool wall adopt corrosion-resistant, smooth surface and anti-to be stained with sticking strong alloy or the non-metallic material of ability in double alkali method desulfurizing technology.
3. method according to claim 1 is characterized in that: at least two of described ion-exchangers, one opens one is equipped with.
4. method according to claim 1 is characterized in that: said ion exchange resin adopts dilution heat of sulfuric acid regeneration.
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| CN2011102562512A CN102423617A (en) | 2011-09-01 | 2011-09-01 | Method of preventing scaling of desulphurization equipment and pipelines used in dual-alkali desulphurization process |
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| CN2011102562512A CN102423617A (en) | 2011-09-01 | 2011-09-01 | Method of preventing scaling of desulphurization equipment and pipelines used in dual-alkali desulphurization process |
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| CN102423617A true CN102423617A (en) | 2012-04-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307348A (en) * | 2014-10-10 | 2015-01-28 | 江苏维尔思环境工程有限公司 | Limestone and soda wet-type desulfurization equipment |
| CN104307343A (en) * | 2014-11-10 | 2015-01-28 | 华玉叶 | Energy-saving and anti-scaling dual-alkali desulfuration method |
| CN105126580A (en) * | 2015-08-07 | 2015-12-09 | 无锡桥阳机械制造有限公司 | Energy-saving and anti-fouling double alkali desulfurization method |
| CN112237816A (en) * | 2019-07-19 | 2021-01-19 | 赤壁市银顺科技有限公司 | Rotary kiln flue gas desulfurization method and ion exchanger used for same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307348A (en) * | 2014-10-10 | 2015-01-28 | 江苏维尔思环境工程有限公司 | Limestone and soda wet-type desulfurization equipment |
| CN104307343A (en) * | 2014-11-10 | 2015-01-28 | 华玉叶 | Energy-saving and anti-scaling dual-alkali desulfuration method |
| CN105126580A (en) * | 2015-08-07 | 2015-12-09 | 无锡桥阳机械制造有限公司 | Energy-saving and anti-fouling double alkali desulfurization method |
| CN112237816A (en) * | 2019-07-19 | 2021-01-19 | 赤壁市银顺科技有限公司 | Rotary kiln flue gas desulfurization method and ion exchanger used for same |
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Application publication date: 20120425 |