CN105126580A - Energy-saving and anti-fouling double alkali desulfurization method - Google Patents
Energy-saving and anti-fouling double alkali desulfurization method Download PDFInfo
- Publication number
- CN105126580A CN105126580A CN201510481077.XA CN201510481077A CN105126580A CN 105126580 A CN105126580 A CN 105126580A CN 201510481077 A CN201510481077 A CN 201510481077A CN 105126580 A CN105126580 A CN 105126580A
- Authority
- CN
- China
- Prior art keywords
- absorption
- flue gas
- fouling
- absorbent
- sent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
The present invention discloses an energy-saving and anti-fouling double alkali desulfurization method. According to the method, hot flue gas is conveyed into an air heat exchange system and then is subjected to heat exchange with cold air, the heated cold air is conveyed into a coal combustion furnace and is used as an oxidizing agent, the flue gas being subjected to the heat exchange is conveyed into a dust remover so as to be dedusted to obtain the purified flue gas, the purified flue gas is introduced into a desulfurization tower, countercurrent contacting absorption is performed with a sodium base absorbent, the absorbent absorbing sulfur dioxide flows into a circulating pool outside the desulfurization tower so as to be subjected to circulating absorption to reduce the fouling of the absorption of liquid in the desulfurization tower, the absorbent is conveyed into a regeneration pool after the pH value of the absorbent in the circulating pool meets the requirement, quick lime is added, the absorption liquid regeneration is performed, the supernatant is conveyed into a sodium type cation exchanger, and the supernatant is exchanged to remove the residual calcium ions so as to prevent the fouling generated in the desulfurization tower and the pipeline. With the method of the present invention, the energy can be saved, the desulfurization efficiency is high, and the fouling is not easily generated inside the desulfurization tower and the pipeline.
Description
Technical field
The invention belongs to filed of flue gas purification, be specifically related to a kind of energy-conservation and can good antiscale property double alkali method desulfurizing method, the fields such as refractory material, coking, pottery, carbon element can be applied to.
Background technology
Along with the development of economy; the mankind are day by day serious to the destruction of environment; the understanding of the continuous people of making to environmental protection of natural calamity improves constantly; management for industrial coal-burning boiler is also improving constantly; meanwhile, along with the increase of China's burning boiler, the quick consumption of low-sulfur coal resource; medium-high sulfur coal can get more and more as the boiler of main fuel, and various places also can be more and more stricter to the discharge index of sulfur dioxide simultaneously.And environmental protection is one of fundamental state policy of China; the disposal of three wastes be build a well-off society in an all-round way, the important content of environmental protect, protecting ecology; as the rich and influential family of Air Pollutant Emission; boiler smoke becomes the improvement object of environmental administration naturally, and also improves year by year the requirement of boiler smoke dust-removal and desulfurizing.At present, the technique that flue gas desulfurization adopts is varied, reach hundreds of more than.In these sulfur removal technologies, some technology are comparatively ripe, and what have is still in the experimental study stage.
Sulfur removal technology main at present comprises:
(1) Wet Fgd By Limestone technique
This method is the SO2 absorbed with lime white in flue gas, and reaction principle is as follows:
Sweetening process:
Ca(OH)
2+SO
2→CaSO
3·1/2H
2O+1/2H
2O
CaSO
3·1/2H
2O+1/2H
2O+SO
2→Ca(HSO
3)
2
Oxidizing process:
2CaSO
3·1/2H
2O+2O
2+3H
2O→2CaSO
4·2H
2O
Ca(HSO
3)
2+1/2O
2+H
2O→CaSO
4·2H
2O+SO
2↑
Limewash method flue gas desulfurization technique is comparatively ripe, and desulfuration efficiency is higher, but the CaSO generated in the process
42H
2o and gypsum ratio are easier to fouling on nozzle, pipeline, plug nozzle and pipeline, and CaSO
42H
2o is indissoluble material, once fouling, can only open and inspect and carry out artificial snaking, causes device maintenance cost higher.
(2) double alkali method flue gas desulfurization technology
Dual alkali is the one of wet desulfurizing process, and principle is first with the SO that the soda clear liquid of solubility discharges as absorbent absorption kiln
2, then with calcium alkali, absorbing liquid to be regenerated, due at SO
2absorb and in regeneration of absorption solution, employ dissimilar alkali, therefore be called Dual alkali.Dual alkali scrubbing FGD process technology grows up in order to the shortcoming overcoming the easy fouling of wet gypsum method, traditional wet gypsum method flue gas desulfurization technique generates calcium sulfite, calcium sulfate after adopting calcium-based desulfurizing agent sulfur dioxide absorption, because product solubility is little, very easily form fouling, clogging in desulfurizing tower and in pipeline.Fouling and clogging problem has a strong impact on the normal operation of desulphurization system, have a strong impact on the normal operation of generator system what is more, in order to avoid the unfavorable factor with calcium-based desulfurizing agent as far as possible, calcium method sulfur removal technology mostly needs to be equipped with corresponding forced oxidation system, thus increases system investments and operating cost.Double alkali method flue gas desulfurization technology, on the basis of application wet gypsum method operation principle, preferably resolves the contradictory problems of desulfurizing tower fouling.
But it is NaSO that double alkali method desulfurizing technology still exists shortcoming
3oxidation side reaction product Na
2sO
4more difficult life, needs constantly to supplement NaOH or Na
2cO
3and increase the consumption of alkali, namely also there is the high disadvantage of operating cost; In addition, the waste heat of high-temperature flue gas does not make full use of, and both wastes energy, is unfavorable for again effectively carrying out of desulphurization reaction, also lacks sulfur dioxide on-line detecting system.
(3) lime dry process stack gas desulfur technology
The reaction principle of lime dry process stack gas desulfur technology is identical with wet method, adopts the SO in lime white absorption flue gas unlike wet method
2, and the pulverized limestone that dry method uses absorbs the SO in flue gas
2.This method desulfuration efficiency is lower, the highlyest can only reach 90%, and floor space is larger, investment and operating cost also very high.
(4) ammonia desulfurizing process
Ammonia desulfurizing process is the SO absorbed with liquefied ammonia in flue gas
2, generate ammonium bisulfite, ammonium bisulfite is reoxidised into ammonium sulfate, and reaction principle is as follows:
Absorb: SO
2+ H
2o+xNH
3=(NH
4) xH
2-xSO
3(ammonium sulfite)
Oxidation: (NH
4) XH
2-XSO
3+ 1/2O
2+ (2-x) NH
3=(NH
4)
2sO
4(sulphur ammonium)
The feature of the ammonia process of desulfurization turns waste into wealth, and do not produce secondary pollution, but the current technology of the ammonia process of desulfurization is not mature enough, and operating cost is higher.
Chinese patent application CN200710067333 discloses a kind of segmented calcium and sodium double alkali method desulfurizing technology, calcium-based desulfurization and sodium alkali flue gas desulfurization are comprehensively completed in a reactor, flue gas is made first to utilize the pre-desulfurization of calcium base, then carry out fine de-sulfur with sodium base and guarantee emission request, also disclose the device adopting segmented calcium and sodium double alkali method desulfurizing technology, calcium-based desulfurization section absorber and sodium alkali flue gas desulfurization section absorber are set in same reactor, dual desulfurization is carried out to flue gas, avoid simultaneously and bring slurries into demister, simplify the flusher of demister.The cleaning of demister adopts sodium base clear liquid, decreases the use amount of fresh water (FW).
Chinese patent application CN201110128743 discloses a kind of technique improving double alkali method desulfurizing, be coal-fired flue-gas after electric precipitation by absorption tower and cyclic absorption agent liquid counter current contacting, flue gas after desulfurization enters chimney; Absorbing liquid send in and regeneration tank, mix with milk of lime slurries, enter inclined plate settler clarified separation after regeneration, clear liquid overflow enters to regenerate liquid bath, adds soda lye, then feeding absorption tower at the bottom of, carry out cyclic absorption.This technique has practical value to the foundation of double alkali method desulfurizing device and reliable and stable operation, and reliability reaches more than 98%, but also there is the problem of low, the easy fouling of efficiency.
And mainly there is following problem in existing technique: 1, desulfuration efficiency is low; 2, in absorption tower and the easy calcium fouling of circulation line; 3, in absorption tower, sulfate crystal is separated out.
Summary of the invention
The object of the invention is to propose a kind of energy-conservation and can good antiscale property double alkali method desulfurizing method, the method can save energy, and desulfuration efficiency is high, desulfurizing tower and channel interior less scaling.
For reaching this object, the present invention by the following technical solutions:
A kind of energy-conservation and can good antiscale property double alkali method desulfurizing method, comprise heat-exchange dedusting, counter-current absorption, regeneration of absorption solution step:
(1) heat-exchange dedusting: heat smoke is sent into air heat-exchange system and cold air carries out heat exchange, heat in flue gas is made full use of, and sent in coal incinerators by the cold air that heats and use as oxidant, improve the temperature entering air and can save the consumed heat that to heat up when cold air enters combustion chamber, flue gas after heat exchange is sent in deduster and is carried out dedusting, flue gas after being purified, thus reduce the impurity in gas, be conducive to follow-up handling procedure.
(2) counter-current absorption: the flue gas after step (1) being purified is introduced in desulfurizing tower, soda absorbent is adopted to carry out counter current contacting absorption, NaOH dissolves in water obtained by soda absorbing liquid, absorb in the circulatory pool outside the inflow of the absorbent after sulfur dioxide desulfurizing tower and carry out cyclic absorption, this makes it possible to prevent absorbing liquid from gathering in the tower prodelta clay of desulfurizing tower, reduce absorbing liquid fouling in desulfurizing tower, after in circulatory pool, the pH value of absorbent reaches requirement, (pH value is between 4-5) sends into regenerated reactor;
(3) regeneration of absorption solution: send in regenerated reactor by meeting the requirements of absorbing liquid in step (2), add quick lime, react to generate with the inferior sulfate radical in absorbing liquid and precipitate, sodium ion is discharged, reach the object of regeneration of absorption solution, and lower sediment is sent into sedimentation basin and carried out forced oxidation, obtain gypsum product.
Supernatant liquor is sent in sodium form cation exchanger, exchanges to remove wherein remaining calcium ion, thus obtains pure sodium hydroxide solution, thus prevent the generation of scale formation in desulfurizing tower and pipeline to the stillness of night.
The invention has the advantages that:
(1) heat smoke is sent into air heat-exchange system and cold air carries out heat exchange, heat in flue gas is made full use of, and sent in coal incinerators by the cold air that heats and use as oxidant, improve the temperature entering air and can save the consumed heat that to heat up when cold air enters combustion chamber, flue gas after heat exchange is sent in deduster and is carried out dedusting, flue gas after being purified, thus reduce the impurity in gas, be conducive to follow-up handling procedure;
(2) the absorbent supernatant liquor regenerated is sent in sodium form cation exchanger, exchanges to remove wherein remaining calcium ion, thus obtains pure sodium hydroxide solution, thus prevent the generation of scale formation in desulfurizing tower and pipeline to the stillness of night;
(3) circulatory pool is arranged on outside desulfurizing tower, effectively can prevent absorbing liquid from gathering in the tower prodelta clay of desulfurizing tower, reduce absorbing liquid fouling in desulfurizing tower.
Detailed description of the invention
Embodiment 1
A kind of energy-conservation and can good antiscale property double alkali method desulfurizing method, it is characterized in that: comprise heat-exchange dedusting, counter-current absorption, regeneration of absorption solution step:
(1) heat-exchange dedusting: heat smoke is sent into air heat-exchange system and cold air carries out heat exchange, sent in coal incinerators by the cold air heated and use as oxidant, the flue gas after heat exchange is sent in deduster and is carried out dedusting, the flue gas after being purified;
(2) counter-current absorption: the flue gas after step (1) being purified is introduced in desulfurizing tower, soda absorbent is adopted to carry out counter current contacting absorption, absorb in the circulatory pool outside the inflow of the absorbent after sulfur dioxide desulfurizing tower and carry out cyclic absorption, reduce absorbing liquid fouling in desulfurizing tower, when in circulatory pool, the pH value of absorbent sends into regenerated reactor after reaching requirement;
(3) regeneration of absorption solution: send in regenerated reactor by meeting the requirements of absorbing liquid in step (2), add quick lime, carry out regeneration of absorption solution, lower sediment is sent into sedimentation basin and is carried out forced oxidation, obtain gypsum product, supernatant liquor is sent in sodium form cation exchanger, exchanges to remove wherein remaining calcium ion, thus prevent the generation of scale formation in desulfurizing tower and pipeline to the stillness of night.
Test with the flue gas being 2-5% containing sulfur dioxide mass fraction, absorbing liquid adopts mass concentration to be the sodium hydroxide solution of 25%, and sulfur dioxide extrusion rate reaches more than 98%, through long-play, be do not occur scale formation in pipeline in tower, operational effect is good, is easy to apply.
The present invention is elaborated it by detailed description of the invention, but those skilled in the art are made on this basis does not exceed any form of claims and the change of details, all belongs to invention which is intended to be protected.
Claims (1)
1. energy-conservation and can a good antiscale property double alkali method desulfurizing method, it is characterized in that: comprise heat-exchange dedusting, counter-current absorption, regeneration of absorption solution step:
(1) heat-exchange dedusting: heat smoke is sent into air heat-exchange system and cold air carries out heat exchange, sent in coal incinerators by the cold air heated and use as oxidant, the flue gas after heat exchange is sent in deduster and is carried out dedusting, the flue gas after being purified;
(2) counter-current absorption: the flue gas after step (1) being purified is introduced in desulfurizing tower, soda absorbent is adopted to carry out counter current contacting absorption, absorb in the circulatory pool outside the inflow of the absorbent after sulfur dioxide desulfurizing tower and carry out cyclic absorption, reduce absorbing liquid fouling in desulfurizing tower, when in circulatory pool, the pH value of absorbent sends into regenerated reactor after reaching requirement;
(3) regeneration of absorption solution: send in regenerated reactor by meeting the requirements of absorbing liquid in step (2), add quick lime, carry out regeneration of absorption solution, lower sediment is sent into sedimentation basin and is carried out forced oxidation, obtain gypsum product, supernatant liquor is sent in sodium form cation exchanger, exchanges to remove wherein remaining calcium ion, thus prevent the generation of scale formation in desulfurizing tower and pipeline to the stillness of night.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481077.XA CN105126580A (en) | 2015-08-07 | 2015-08-07 | Energy-saving and anti-fouling double alkali desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481077.XA CN105126580A (en) | 2015-08-07 | 2015-08-07 | Energy-saving and anti-fouling double alkali desulfurization method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105126580A true CN105126580A (en) | 2015-12-09 |
Family
ID=54712356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510481077.XA Pending CN105126580A (en) | 2015-08-07 | 2015-08-07 | Energy-saving and anti-fouling double alkali desulfurization method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105126580A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106861432A (en) * | 2017-03-31 | 2017-06-20 | 湖南求是检测科技有限公司 | The purification technique of regenerating desulfurization absorbing liquid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001029740A (en) * | 1999-07-23 | 2001-02-06 | Ishikawajima Harima Heavy Ind Co Ltd | Wet exhaust gas treatment equipment |
| 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 |
| CN202122897U (en) * | 2010-12-29 | 2012-01-25 | 西安交通大学 | Efficiency-increasing, energy-saving and emission-reducing comprehensive dedusting desulfurization device based on cooling of flue gas |
| CN102423617A (en) * | 2011-09-01 | 2012-04-25 | 湖南湘达环保工程有限公司 | Method of preventing scaling of desulphurization equipment and pipelines used in dual-alkali desulphurization process |
| CN104307343A (en) * | 2014-11-10 | 2015-01-28 | 华玉叶 | Energy-saving and anti-scaling dual-alkali desulfuration method |
-
2015
- 2015-08-07 CN CN201510481077.XA patent/CN105126580A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001029740A (en) * | 1999-07-23 | 2001-02-06 | Ishikawajima Harima Heavy Ind Co Ltd | Wet exhaust gas treatment equipment |
| CN202122897U (en) * | 2010-12-29 | 2012-01-25 | 西安交通大学 | Efficiency-increasing, energy-saving and emission-reducing comprehensive dedusting desulfurization device based on cooling of 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 |
| CN102423617A (en) * | 2011-09-01 | 2012-04-25 | 湖南湘达环保工程有限公司 | Method of preventing scaling of desulphurization equipment and pipelines used in dual-alkali desulphurization process |
| CN104307343A (en) * | 2014-11-10 | 2015-01-28 | 华玉叶 | Energy-saving and anti-scaling dual-alkali desulfuration method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106861432A (en) * | 2017-03-31 | 2017-06-20 | 湖南求是检测科技有限公司 | The purification technique of regenerating desulfurization absorbing liquid |
| CN106861432B (en) * | 2017-03-31 | 2020-02-07 | 湖南求是检测科技有限公司 | Purification process of renewable desulfurization absorption liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2015271405B2 (en) | Process and device for desulphurization and denitration of flue gas | |
| CN103894047B (en) | Flue gas pollutant controls integrated purifying recovery process | |
| CN105214478A (en) | The integral process of a kind of coke oven flue exhuast gas desulfurization denitration and waste heat recovery | |
| WO2008052465A1 (en) | A sintered flue gas wet desulfurizing and dedusting process | |
| CN102343203B (en) | Method for purifying harmful substances in smoke produced by combustion of boiler | |
| CN102357337A (en) | Desulphurization technology through sodium-calcium dual-alkali method | |
| CN103877839A (en) | Flue gas pollutant control integrated purification process | |
| CN106310943B (en) | A kind of sodium sulfite desulfurization regeneration and recycling sulfur dioxide device and application | |
| CN103480260B (en) | Wet flue gas desulphurization technology by utilization of ethylene waste lye | |
| CN103007718B (en) | Wet redox, desulfuration and resource utilization method for flue gas | |
| CN103585869A (en) | Flue gas purifying method with recyclable alkali absorption liquid | |
| EA002327B1 (en) | Process for producing highly reactive lime in a furnace | |
| CN105080327A (en) | Method for desulfurizing and recovering NOx with alkali liquor | |
| CN102949924B (en) | Method for applying petrochemical exhausted lye to semidry-method flue gas desulfurization | |
| CN208852689U (en) | A kind of Novel flue gas desulphurization system | |
| CN202962254U (en) | Device for purifying harmful substances in smoke generated during boiler combustion | |
| CN205570080U (en) | Coke oven smoke desulfurization system | |
| CN105126580A (en) | Energy-saving and anti-fouling double alkali desulfurization method | |
| CN109126435B (en) | Double-alkali flue gas desulfurization process | |
| CN104307343A (en) | Energy-saving and anti-scaling dual-alkali desulfuration method | |
| CN105771594A (en) | Zinc oxide desulfurization process | |
| CN110038420A (en) | Flue gas full-dry method purifying technique | |
| CN102172469A (en) | Composite flue gas purification additive for wet flue gas desulfurization system | |
| CN205760546U (en) | Cement kiln desulphurization system | |
| CN203990280U (en) | A kind of system that removes sulfur dioxide in flue gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151209 |