CN101502754A - Dual alkali desulphurization energy-saving technique - Google Patents
Dual alkali desulphurization energy-saving technique Download PDFInfo
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- CN101502754A CN101502754A CNA2009100641777A CN200910064177A CN101502754A CN 101502754 A CN101502754 A CN 101502754A CN A2009100641777 A CNA2009100641777 A CN A2009100641777A CN 200910064177 A CN200910064177 A CN 200910064177A CN 101502754 A CN101502754 A CN 101502754A
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- flue gas
- alkali
- desulphurization
- desulfurization
- calcium
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Abstract
A dual-alkali desulphurization energy-saving technique is characterized in that the technique comprises the following steps: flue gas introduced out by a tunnel kiln hood is sent to an air heat exchange system and carries out heat exchange with cold air entering the air heat exchange system from outside; the heated cold air enters a gas generator through a connecting pipeline and is used as an oxidant; the cooled flue gas enters a desulphurization tower through the connecting pipeline and carries out atomization with alkali liquid sprayed from the top of the tower on a swirling plate to facilitate SO2 in the flue gas to be absorbed and react with the sprayed alkali liquid fully; the purified flue which is subjected to desulphurization and washing is discharged into atmosphere after the detection of sulfur dioxide on-line detection system, loop slurry discharged from the desulphurization tower is sent to a regenerative reactor provided with a stirring device, reacts with added slaked lime fully and then is sent to a precipitation tank for precipitation, supernatant liquid obtained by precipitation overflows into a desulphurization liquid tank and undergoes circular desulphurization after addition of alkali, and the precipitated calcium sulfite, calcium sulfate and calcium carbonate are removed regularly.
Description
Technical field
The present invention relates to dual alkali desulphurization energy-saving technique, relate to a kind of refractory material production process desulphurization energy-saving technique specifically.This technology is mainly used in refractory materials manufacturing enterprise, also is widely used in field of metallurgy such as coking, pottery, carbon element, refining lead, zinc metallurgy, copper metallurgy.
Background technology
At refractory materials manufacturing enterprise, remove the sulfur dioxide in the tunnel kiln smoke-gas, be to adopt double alkali method desulfurizing technology.Two alkaline process are a kind of of wet desulfurizing process, and principle is the SO that absorbs the kiln discharging earlier with the soda clear liquid of solubility as absorbent
2, with calcium alkali absorption liquid is regenerated again, because at SO
2In absorption and the regeneration of absorption solution, used dissimilar alkali, so be called two alkaline process.The dual alkali scrubbing FGD process technology grows up for the shortcoming that overcomes 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 to absorb sulfur dioxide, because product solubility is little, very easily in desulfurizing tower and in the pipeline, form fouling, clogging.The fouling blockage 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 unfavorable factor as far as possible with calcium-based desulfurizing agent, calcium method sulfur removal technology mostly needs to be equipped with corresponding forced oxidation system, thus investment of increase system and operating cost.Double alkali method flue gas desulfurization technology preferably resolves the contradictory problems of desulfurizing tower fouling on the basis of using wet gypsum method operation principle.
Yet it is NaSO that still there is shortcoming in double alkali method desulfurizing technology
3Oxidation side reaction product Na
2SO
4More difficult life needs constantly to replenish NaOH or Na
2CO
3And promptly also there is the high disadvantage of operating cost in the consumption of increase alkali; In addition, the waste heat of high-temperature flue gas does not make full use of, and has both wasted energy, is unfavorable for effectively carrying out of desulphurization reaction again, also lacks the sulfur dioxide on-line detecting system.How reducing the desulfurization operation expense, can be metallurgy industry problem demanding prompt solutions such as refractory material for industry energy conservation synergy again when desulfurization reduces discharging.
Summary of the invention
Purpose of the present invention provides a kind of desulfurization energy-conservation dual alkali desulphurization energy-saving technique of holding concurrently that has just at existing weak point in the above-mentioned existing desulfur technology.The present invention is keeping by the grafting heat transfer technology, making full use of the sensible heat of flue gas under the constant situation of original double alkali method desulfurizing technology basic principle, and then optimization gas generator gas-made technology, reduces discharging energy-conservation double effects thereby reach.
New technology of the present invention is achieved through the following technical solutions:
Dual alkali desulphurization energy-saving technique of the present invention comprises the steps:
To send into the air heat-exchange system by the flue gas that the tunnel cave kiln hood is drawn and carry out heat exchange with the cold air that enters the air heat-exchange system by the external world; Cold air after being heated enters gas generator via connecting line and uses as oxidant; Entered desulfurizing tower by the flue gas of being lowered the temperature via connecting line, and atomize at the eddy flow plate, make SO in the flue gas with alkali lye under the cat head spray
2Fully absorb, react with the alkali lye of spray; After detecting by the sulfur dioxide on-line detecting system, the purification flue gas after the desulfurization washing enters atmosphere, the loop slurry of discharging from desulfurizing tower then be admitted to be provided with agitating device the regeneration reactor and the white lime of adding be admitted to sedimentation basin again after fully reacting and precipitate, the overflow of post precipitation gained supernatant enters the desulfurization liquid pool, circulation desulfurization after mending alkali, the calcium sulfite that is settled out, calcium sulfate and calcium carbonate are regularly removed.
The present invention utilizes sodium hydroxide solution as starting desulfurizing agent, directly squeezes into desulfurizing tower with prepared sodium hydroxide solution and absorbs SO in the flue gas
2Reach the purpose of flue gas desulfurization, desulfurization product is regenerated through calcium hydroxide then, is reduced into NaOH and returns in the desulfurizing tower and recycle.
Beneficial effect of the present invention is as follows:
Because the present invention has adopted and will send into the air heat-exchange system by the flue gas that the tunnel cave kiln hood is drawn and carry out the heat exchange operation with the cold air that is entered the air heat-exchange system by the external world, and heated cold air is sent into gas generator use as combustion adjuvant and oxidant, can make not only that gas generator is energy-conservation to be reached about 8%, and the flue gas of being lowered the temperature also more helps the absorption of alkali lye.
Description of drawings
Fig. 1 is the process chart of prior art.
Fig. 2 is a process chart of the present invention.
The specific embodiment
The present invention is further described below with reference to embodiment (accompanying drawing):
As shown in Figure 2, dual alkali desulphurization energy-saving technique of the present invention comprises the steps:
To send into the air heat-exchange system by the flue gas that the tunnel cave kiln hood is drawn and carry out heat exchange with the cold air that enters the air heat-exchange system by the external world; Cold air after being heated enters gas generator via connecting line and uses as oxidant; Entered desulfurizing tower by the flue gas of being lowered the temperature via connecting line, flue gas enters in the desulfurizing tower back and upwards flows, and washs with reflux type with the alkali lye of downward spray, and gas-liquid fully contacts; Desulfurizing tower adopts the mode of built-in several layers eddy flow plate, be furnished with jet pipe on the Ta Nei the superiors eddy flow plate, the sodium hydroxide solution of spray is ejected on the water-locator of eddy flow plate axis by gunite layer, the even cloth of alkali lye is opened then, under the guide functions of eddy flow plate, the flue gas rotation is risen, and is tangent with the alkali lye of even cloth on the eddy flow plate, further, fully absorb SO with the alkali lye atomizing
2, SO
3Deng sour gas, generate NaSO
3, NaHSO
3, consumed NaOH simultaneously as absorbent; After detecting by the sulfur dioxide on-line detecting system, the purification flue gas after the desulfurization washing enters atmosphere, and from the slurries that desulfurizing tower is discharged be admitted to be provided with agitating device the regeneration reactor and the white lime of adding be admitted to sedimentation basin again after fully reacting and precipitate, the overflow of post precipitation gained supernatant enters the desulfurization liquid pool, and circulation absorbs SO as circulation fluid after circulating pump is squeezed into desulfurizing tower through mending alkali
2Carry out circulation desulfurization, and the calcium sulfite that is settled out, calcium sulfate and calcium carbonate are removed regularly.
Described sulfur dioxide on-line detecting system can adopt prior art to realize, but this system's continuous detecting discharging sulfur in smoke content guarantees that system's desulfuration efficiency and sulfur removal technology normally move.
Design theory of the present invention and principle are as follows:
Dual alkali desulphurization energy-saving technique is to adopt the sodium base desulfurizer to carry out desulfurization in the tower, because sodium base desulfurizer alkalescence is strong, it is big to absorb sulfur dioxide afterreaction product solubility, can not cause the supersaturation crystallization to cause the fouling blockage problem.Desulfurization product is discharged in the regenerated reactor and carries out reducing/regenerating with calcium hydroxide, and the sodium base desulfurizer that bears is again returned desulfurizing tower again and recycled.
The present invention utilizes sodium hydroxide solution as starting desulfurizing agent, directly squeezes into desulfurizing tower with prepared sodium hydroxide solution and absorbs SO in the flue gas
2Reach the purpose of flue gas desulfurization, desulfurization product is regenerated through calcium hydroxide then, is reduced into NaOH and returns in the desulfurizing tower and recycle.
The sulfur removal technology process mainly comprises 3 parts: the preparation of (1) absorbent is with additional; (2) absorbent contacts with flue gas and carries out mass-and heat-transfer; (3) doctor solution regeneration reducing outside tower becomes absorbent.
Desulfurization reaction mechanism is as follows:
(1) absorption reaction
In desulfurizing tower, absorb SO in the flue gas with soda bath
2:
2NaOH+SO
2＝Na
2SO
3+H
2O
Na
2SO
3+SO
2+H
2O＝2NaHSO
3
(2) regenerative response
Doctor solution flows in the regenerated reactor and reacts with milk of lime:
2NaHSO
3+Ca(OH)
2＝Na
2SO
3+CaSO
3·1/2H
2O↓+3/2H
2O
Na
2SO
3+Ca(OH)
2+1/2H
2O＝2NaOH+CaSO
3·1/2H
2O↓
Slurries after the regeneration contain NaOH, Na behind calcium precipitation
2SO
3Clear liquid send desulfurizing tower back to and recycle.
(3) side reaction
The main side reaction of absorption process is an oxidation reaction:
Na
2SO
3+1/2O
2＝Na
2SO
4
Na in regenerative process
2SO
4Following reaction takes place:
Na
2SO
4+Ca(OH)
2+2H
2O＝2NaOH+CaSO
4·2H
2O↓
Process of the present invention is compared with conventional double alkali method desulfurizing technology, and this law is the complete of energy-conservation and emission-reduction technology U.S. combination when taking full advantage of fume afterheat, has been optimized the producer gas-made technology; Namely reducing discharging SO2The time, rationally utilized waste heat, broken the traditional idea that reduces discharging no economic benefit.
Claims (1)
1, a kind of dual alkali desulphurization energy-saving technique is characterized in that: it comprises the steps: that the flue gas of being drawn by the tunnel cave kiln hood is sent into the air heat-exchange system carries out heat exchange with the cold air that is entered the air heat-exchange system by the external world; Cold air after being heated enters gas generator via connecting line and uses as oxidant; Entered desulfurizing tower by the flue gas of being lowered the temperature via connecting line, and atomize at the eddy flow plate, make SO in the flue gas with alkali lye under the cat head spray
2Fully absorb, react with the alkali lye of spray; After detecting by the sulfur dioxide on-line detecting system, the purification flue gas after the desulfurization washing enters atmosphere, the loop slurry of discharging from desulfurizing tower then be admitted to be provided with agitating device the regeneration reactor and the white lime of adding be admitted to sedimentation basin again after fully reacting and precipitate, the overflow of post precipitation gained supernatant enters the desulfurization liquid pool, circulation desulfurization after mending alkali, the calcium sulfite that is settled out, calcium sulfate and calcium carbonate are regularly removed.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101816887A (en) * | 2010-05-07 | 2010-09-01 | 吉林安洁环保有限公司 | High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal |
| CN101992017A (en) * | 2010-09-13 | 2011-03-30 | 太原煤气化股份有限公司焦化厂 | Device and method for treating sodium salt-containing desulfurization waste liquid in coking industry |
| CN102564149A (en) * | 2012-03-19 | 2012-07-11 | 淄博汇久自动化技术有限公司 | Industrial kiln waste gas purifying and recovery process and industrial kiln waste gas purifying and recovery equipment |
| CN102949927A (en) * | 2012-11-12 | 2013-03-06 | 国家电网公司 | Thermal power plant boiler flue gas desulfurization method |
| CN105536535A (en) * | 2016-01-11 | 2016-05-04 | 煤科集团杭州环保研究院有限公司 | Soda lime dual-alkali smoke desulfurization automatic circulating and refluxing regeneration system and treatment technology thereof |
| CN107441899A (en) * | 2017-07-19 | 2017-12-08 | 哈尔滨工程大学 | A kind of boat diesel engine regenerative sodium alkali desulfurization system |
| CN108043204A (en) * | 2017-12-20 | 2018-05-18 | 上海电力学院 | A kind of high-calcium powder flue-gas desulphurization system and its application |
| CN108211764A (en) * | 2018-03-20 | 2018-06-29 | 成都信息工程大学 | A kind of swinging moves tunnel brick and tile kiln flue-gas dust-removing and desulfurization defluorinate device |
| CN110237652A (en) * | 2019-06-21 | 2019-09-17 | 郑州轻工业学院 | A swirl plate reaction system that can automatically adjust the blade angle |
| CN111644061A (en) * | 2020-06-15 | 2020-09-11 | 碧水蓝天环境工程有限公司 | Wet-type dual-alkali desulfurization dust collector |
| CN113351001A (en) * | 2021-06-29 | 2021-09-07 | 湖南阿斯米科技有限公司 | Flue gas treatment device in production of graphite anode material |
| CN113648804A (en) * | 2020-05-12 | 2021-11-16 | 山东清沂山石化科技有限公司 | Novel in-furnace desulfurization and nitrogen inhibition technical method |
| CN114522538A (en) * | 2022-03-21 | 2022-05-24 | 慈溪中科众茂环保热电有限公司 | Boiler flue gas desulfurization system and desulfurization method |
| CN115646186A (en) * | 2021-12-31 | 2023-01-31 | 山东庚辰环保新材料有限公司 | Circulating desulfurization device, process and application |
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| CN1660474A (en) * | 2004-12-15 | 2005-08-31 | 中国科学院广州能源研究所 | Wet flue gas desulfurization process |
| CN101053739A (en) * | 2007-02-15 | 2007-10-17 | 李滔 | Double alkali method flue gas desulfurization technology |
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2009
- 2009-02-09 CN CNA2009100641777A patent/CN101502754A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1660474A (en) * | 2004-12-15 | 2005-08-31 | 中国科学院广州能源研究所 | Wet flue gas desulfurization process |
| CN101053739A (en) * | 2007-02-15 | 2007-10-17 | 李滔 | Double alkali method flue gas desulfurization technology |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101816887A (en) * | 2010-05-07 | 2010-09-01 | 吉林安洁环保有限公司 | High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal |
| CN101992017A (en) * | 2010-09-13 | 2011-03-30 | 太原煤气化股份有限公司焦化厂 | Device and method for treating sodium salt-containing desulfurization waste liquid in coking industry |
| CN102564149A (en) * | 2012-03-19 | 2012-07-11 | 淄博汇久自动化技术有限公司 | Industrial kiln waste gas purifying and recovery process and industrial kiln waste gas purifying and recovery equipment |
| CN102949927A (en) * | 2012-11-12 | 2013-03-06 | 国家电网公司 | Thermal power plant boiler flue gas desulfurization method |
| CN105536535A (en) * | 2016-01-11 | 2016-05-04 | 煤科集团杭州环保研究院有限公司 | Soda lime dual-alkali smoke desulfurization automatic circulating and refluxing regeneration system and treatment technology thereof |
| CN107441899A (en) * | 2017-07-19 | 2017-12-08 | 哈尔滨工程大学 | A kind of boat diesel engine regenerative sodium alkali desulfurization system |
| CN108043204B (en) * | 2017-12-20 | 2024-01-26 | 上海电力学院 | High-calcium pulverized coal flue gas desulfurization system and application thereof |
| CN108043204A (en) * | 2017-12-20 | 2018-05-18 | 上海电力学院 | A kind of high-calcium powder flue-gas desulphurization system and its application |
| CN108211764A (en) * | 2018-03-20 | 2018-06-29 | 成都信息工程大学 | A kind of swinging moves tunnel brick and tile kiln flue-gas dust-removing and desulfurization defluorinate device |
| CN110237652A (en) * | 2019-06-21 | 2019-09-17 | 郑州轻工业学院 | A swirl plate reaction system that can automatically adjust the blade angle |
| CN113648804A (en) * | 2020-05-12 | 2021-11-16 | 山东清沂山石化科技有限公司 | Novel in-furnace desulfurization and nitrogen inhibition technical method |
| CN111644061A (en) * | 2020-06-15 | 2020-09-11 | 碧水蓝天环境工程有限公司 | Wet-type dual-alkali desulfurization dust collector |
| CN113351001A (en) * | 2021-06-29 | 2021-09-07 | 湖南阿斯米科技有限公司 | Flue gas treatment device in production of graphite anode material |
| CN115646186A (en) * | 2021-12-31 | 2023-01-31 | 山东庚辰环保新材料有限公司 | Circulating desulfurization device, process and application |
| CN115646186B (en) * | 2021-12-31 | 2024-03-08 | 山东庚辰环保新材料有限公司 | Circulation desulfurization device, technology and application |
| CN114522538A (en) * | 2022-03-21 | 2022-05-24 | 慈溪中科众茂环保热电有限公司 | Boiler flue gas desulfurization system and desulfurization method |
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Application publication date: 20090812 |