CN102886199A - Flue gas desulfurization device and desulfurization method by magnesium oxide process - Google Patents
Flue gas desulfurization device and desulfurization method by magnesium oxide process Download PDFInfo
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- CN102886199A CN102886199A CN201210415270XA CN201210415270A CN102886199A CN 102886199 A CN102886199 A CN 102886199A CN 201210415270X A CN201210415270X A CN 201210415270XA CN 201210415270 A CN201210415270 A CN 201210415270A CN 102886199 A CN102886199 A CN 102886199A
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Abstract
The invention belongs to the technical field of atmospheric environment protection, and particularly relates to a flue gas desulfurization device and desulfurization method by a magnesium oxide process. The invention provides a reaction tank using a circulation-oxidization integrated structure in a desulfurization process, and adds clear liquid return, filtrate recovery and other steps, thereby overcoming the defects of complex technique, high investment, low magnesium oxide regeneration rate, high energy consumption, high operating cost and the like in the traditional magnesium oxide laundering-regeneration desulfurization process. The invention is especially suitable for flue gas desulfurization of medium/small machine sets in China, and has active actions on energy source comprehensive utilization and environmental protection in China.
Description
(1) technical field
The invention belongs to the atmospheric environment protection technical field, particularly a kind of magnesium oxide method flue gas desulfurization device and sulfur method.
(2) background technology
At present, the capital construction of large-sized boiler equipment desulfurization project of China coal-burning power plant is complete, and most of professional desulfurization company turns to the flue gas desulfurization of Pump for Medium and Small Power Generating Set to sight, and the sulfur removal technology of Pump for Medium and Small Power Generating Set is also in development.
Magnesia is as desulfurizing agent, and chemical reactivity will be much larger than calcium-based desulfurizing agent.The present explored magnesia reserves of China are about 16,000,000,000 tons, account for globally about 80%, and full-fledged magnesium oxide method sulfur removal technology is significant.
But, by to the in recent years follow-up investigation of magnesium oxide method desulfurizing item, find the process long-time running, traditional magnesia is washed and starched-the following problem of method of reproduction sulfur removal technology ubiquity: 1, complex process, investment is large; 2, the magnesia regeneration rate is low.Magnesium sulfite calcination and regeneration magnesia needs the temperature more than 800 degrees centigrade, and magnesium sulfate calcination and regeneration magnesia then needs higher temperature, along with the increase of magnesium sulfate content in the system causes the magnesia conversion ratio more and more lower; 3, the actual motion cost is high.Regenerative process is controlled bad meeting and is caused larger heat loss, consumes simultaneously a large amount of reduction carbon; 4, fouling in the tower.Because the magnesia regeneration rate is low, cause desulfuration efficiency to descend, for keeping higher desulfuration efficiency, pH value need to be controlled at more than 7, causes fouling in the absorption tower after the long-time running.
Above problem has had a strong impact on the at home application in the Pump for Medium and Small Power Generating Set flue gas desulfurization of magnesium oxide method.
(3) summary of the invention
The present invention is in order to remedy the deficiencies in the prior art, provide a kind of invest little, operating cost is low, efficient is high, can avoid the desulfurizing agent huge waste and prevent magnesium oxide method flue gas desulfurization device and the sulfur method that fouling is stopped up in the absorption tower.
The present invention is achieved through the following technical solutions:
A kind of magnesium oxide method flue gas desulfurization device, comprise absorption tower and magnesia powder storehouse, the magnesia powder storehouse is communicated with slurrying pond, circulatory pool and sedimentation basin successively, the bottom, absorption tower is provided with the pipeline that leads to circulatory pool, it is characterized in that: described circulatory pool is connected by the spraying layer of absorption tower circulating pump with top, absorption tower, the sedimentation basin top is returned pump by clear liquid and is connected with the slurrying pond, the sedimentation basin bottom is connected with plate and frame filter press by deslagging pump, and the plate compression motor spindle is connected with sewage treatment equipment or epsom salt Preparation equipment with circulatory pool respectively.
Described slurrying pond is connected with circulatory pool by slurry supply pump, and circulatory pool is connected half general formula to connect with sedimentation basin, and the bottom is respectively arranged with the oxidation air pipeline, and the oxidation air pipeline is connected with oxidation fan respectively.
Described sedimentation basin is flat flow, is provided with the pulse suspension device in the sedimentation basin, is equipped with agitating device in circulatory pool and the slurrying pond.
Magnesium oxide method fume desulphurization method of the present invention comprises the steps:
A. the magnesium oxide powder in the magnesia powder storehouse is passed in the slurrying pond and make magnesium hydroxide slurry;
B. the magnesium hydroxide slurry in the slurrying pond passes in the circulatory pool under the effect of slurry supply pump, the absorption tower circulating pump extracts magnesium hydroxide slurry in circulatory pool, in the absorption tower, spray magnesium hydroxide slurry washing flue gas by circulating line and spraying layer, remove the SO in the flue gas
2
C. open oxidation fan, in circulatory pool and sedimentation basin, blast air by the oxidation air pipeline, the bottom, absorption tower is absorbed SO
2The magnesium sulfite circulation fluid oxidation that generates generates Adlerika;
D. the insoluble impurities in the magnesium oxide powder precipitates in sedimentation basin, sends into the plate and frame filter press dehydration by deslagging pump, makes the filter cake outward transport;
E. a sedimentation basin upper clear supernate part is returned by clear liquid and is pumped to the slurrying of slurrying pond, and another part is used for sedimentation basin pulse suspension device;
F. can get back to circulatory pool or send into the epsom salt Preparation equipment or enter useless treatment facility from plate and frame filter press filtrate out.
Bottom, described absorption tower is controlled to be 6.5 by the pH value that pipeline enters the circulation fluid of circulatory pool.
The mass concentration of Adlerika is not higher than 15% in the circulation fluid of described circulatory pool.
The mass percent concentration of the magnesium hydroxide slurry for preparing in the described slurrying pond is 10%～30%.
The magnitude of recruitment in magnesia powder foot couple slurrying pond is SO in the absorption tower by the ratio of amount in the described unit interval
21.03 for the treatment of capacity.
Described absorption tower circulating pump is sent into the circulation fluid on absorption tower and the liquid-gas ratio of flue gas is 5.5 liters/cubic metre.
The mass concentration of the magnesium sulfate filtrate of described plate and frame filter press discharging is 15%.
Beneficial effect of the present invention is:
(1) removed traditional magnesia to wash and starch-method of reproduction in the magnesia step for regeneration, increased the multiple working procedures such as clear liquid returns, filtrate recovery and reached the maximum utilization of resources;
(2) sulfur removal technology adopts the reaction tank of cyclic oxidation integrative-structure, and circulation fluid absorbs SO
2Rear generation magnesium sulfite enters from desulfurizing tower that direct oxidation is Adlerika behind the circulatory pool, has avoided fouling and alluvial, has saved investment cost;
(3) sulfur removal technology adopts the plate and frame filtering equipment, than vacuum belt dewaterer with drag for slag equipment, has greatly saved space and investment;
(4) the wastewater treatment mode can independently be selected by enterprise, comprises that the epsom salt that reclaims in the discharging waste liquid further reduces operating cost or directly enters sewage treatment plant's processing.
The present invention has overcome conventional oxidation magnesium and has washed and starched-shortcomings such as the method for reproduction sulfur removal technology is complicated, investment height, the magnesia regeneration rate is low, energy consumption is high, operating cost is high; especially be fit to domestic Pump for Medium and Small Power Generating Set flue gas desulfurization, positive role has been played in China's comprehensive utilization of energy and environmental protection.
(4) description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is apparatus structure schematic diagram of the present invention.
Among the figure, 1 absorption tower, 2 magnesia powder storehouses, 3 slurrying ponds, 4 circulatory pools, 5 sedimentation basins, 6 pipelines, 7 absorption tower circulating pumps, 8 spraying layers, 9 clear liquids return pump, 10 deslagging pumps, 11 plate and frame filter press, 12 sewage treatment equipments, 13 epsom salt Preparation equipments, 14 slurry supply pumps, 15 oxidation air pipelines, 16 oxidation fans, 17 agitating devices, 18 pulse suspension devices.
(5) specific embodiment
Accompanying drawing is a kind of specific embodiment of the present invention:
This embodiment comprises absorption tower 1 and magnesia powder storehouse 2, magnesia powder storehouse 2 is communicated with slurrying pond 3, circulatory pool 4 and sedimentation basin 5 successively, 1 bottom, absorption tower is provided with the pipeline 6 that leads to circulatory pool 4, circulatory pool 4 is connected by the spraying layer 8 of absorption tower circulating pump 7 with 1 top, absorption tower, sedimentation basin 5 tops are returned pump 9 by clear liquid and are connected with slurrying pond 3, sedimentation basin 5 bottoms are connected with plate and frame filter press 11 by deslagging pump 10, and plate and frame filter press 11 bottoms are connected with sewage treatment equipment 12 or epsom salt Preparation equipment 13 with circulatory pool 4 respectively.Slurrying pond 3 is connected with circulatory pool 4 by slurry supply pump 14, and circulatory pool 4 is connected with sedimentation basin and is adopted half general formula to connect, and the bottom is respectively arranged with oxidation air pipeline 15, and oxidation air pipeline 15 is connected with oxidation fan 16 respectively.Sedimentation basin 5 is flat flow, is provided with pulse suspension device 18 in the sedimentation basin 5, is equipped with agitating device 17 in circulatory pool 4 and the slurrying pond 3.
Magnesium oxide method fume desulphurization method of the present invention comprises the steps: that (1) passes into the magnesium oxide powders in the magnesia powder storehouse 2 in the slurrying pond 3 to make magnesium hydroxide slurry; (2) magnesium hydroxide slurry in the slurrying pond 3 passes in the circulatory pool 4 under the effect of slurry supply pump 14, absorption tower circulating pump 7 is from circulatory pool 4 interior extraction magnesium hydroxide slurries, by circulating line and spraying layer 8 to the absorption tower 1 interior spray magnesium hydroxide slurry washing flue gas, remove the SO in the flue gas
2(3) open oxidation fan 16, in circulatory pool 4 and sedimentation basin 5, blast air by oxidation air pipeline 15,1 bottom, absorption tower is absorbed SO
2The magnesium sulfite circulation fluid oxidation that generates generates Adlerika; (4) insoluble impurities in the magnesium oxide powder precipitates in sedimentation basin 5, sends into plate and frame filter press 11 dehydrations by deslagging pump 10, makes the filter cake outward transport; (5) sedimentation basin 5 upper clear supernate parts are returned pump 9 by clear liquid and are delivered to 3 slurrying of slurrying pond, and another part is used for sedimentation basin 5 pulse suspension devices 18; (6) can get back to circulatory pool 4 or send into epsom salt Preparation equipment 13 or enter sewage treatment equipment 12 from plate and frame filter press 11 filtrate out.
Tower outer circulation magnesium oxide method sulfur removal technology of the present invention, at first the powder tank car ships the above outsourcing magnesia powder of 200 orders and sends into magnesia powder storehouse 2 outside the factory, metering device by being located at 2 bottoms, magnesia powder storehouse 3 adds magnesia powders to the slurrying pond, by the control to plant area's fresh water (FW) and sedimentation basin 5 supernatant flows, make the magnesium hydroxide slurry that mass percent concentration is 10-30%.
When system just moves, fill with 5% magnesium hydroxide slurry in circulatory pool 4, the volume of circulatory pool 4 will guarantee to reach under the condition of 5.5 liters/standard cubic meter at liquid-gas ratio, and absorption tower circulating pump 7 guarantees 5～8 minutes plasma discharge amount when all opening.
1 bottom, absorption tower is controlled to be 6.5 by the pH value that pipeline 6 enters the circulation fluid of circulatory pool 4, and the circulation fluid that 1 end of absorption tower is discharged is subacidity, fouling in the anti-locking system.
For guaranteeing that system reaches the stably desulphurizing operational effect, the circulation fluid Adlerika mass concentration in the circulatory pool 4 can not surpass 15%.
The filtrate that plate and frame filter press 11 is discharged is through after collecting, be lower than 15% such as the magnesium sulfate mass concentration and return circulatory pool 4, be higher than 15% integrated treatment such as the magnesium sulfate mass concentration, processing method is for sending into epsom salt Preparation equipment 13 or entering sewage treatment equipment 12.
Magnesium oxide method fume desulphurization method of the present invention: removed traditional magnesia to wash and starch-method of reproduction in the magnesia step for regeneration; Increase the multiple working procedures such as clear liquid returns, filtrate recovery and reached the maximum utilization of resources; The wastewater treatment mode can independently be selected by enterprise, comprises that the epsom salt that reclaims in the discharging waste liquid further reduces operating cost or directly enters sewage treatment plant's processing.
Main points of the present invention are: 1, absorption tower 1 outlet circulation fluid pH value is key control parameter, control to pH value and desulfurization absorbent feeding coal, should guarantee the pH value of absorption tower 1 outlet circulation fluid within the specific limits, the quantity delivered that guarantees again magnesium hydroxide slurry can not be too high, otherwise cause easily the waste of desulfurizing agent to cause desulphurization cost to increase.2, sulfur removal technology adopts the reaction tank of cyclic oxidation integrative-structure, and circulation fluid absorbs SO
2Rear generation magnesium sulfite enters from absorption tower 1 that direct oxidation is Adlerika behind the circulatory pool, has avoided fouling and alluvial, has saved investment cost.3, desulphurization system discharging Adlerika concentration is key control parameter, and too high meeting causes SO
2Dividing potential drop increases impact and absorbs, and too lowly then causes the wasting of resources.4, sulfur removal technology adopts the plate and frame filtering equipment, than vacuum belt dewaterer with drag for slag equipment, has greatly saved space and investment.
The present invention has overcome conventional oxidation magnesium and has washed and starched-shortcomings such as the method for reproduction sulfur removal technology is complicated, investment height, the magnesia regeneration rate is low, energy consumption is high, operating cost is high; especially be fit to domestic Pump for Medium and Small Power Generating Set flue gas desulfurization, positive role has been played in China's comprehensive utilization of energy and environmental protection.
Claims (10)
1. magnesium oxide method flue gas desulfurization device, comprise absorption tower (1) and magnesia powder storehouse (2), magnesia powder storehouse (2) is communicated with slurrying pond (3) successively, circulatory pool (4) and sedimentation basin (5), bottom, absorption tower (1) is provided with the pipeline (6) that leads to circulatory pool (4), it is characterized in that: described circulatory pool (4) is connected by the spraying layer (8) of absorption tower circulating pump (7) with top, absorption tower (1), sedimentation basin (5) top is returned pump (9) by clear liquid and is connected with slurrying pond (3), sedimentation basin (5) bottom is connected with plate and frame filter press (11) by deslagging pump (10), and plate and frame filter press (11) bottom is connected with sewage treatment equipment (12) or epsom salt Preparation equipment (13) with circulatory pool (4) respectively.
2. a kind of magnesium oxide method flue gas desulfurization device according to claim 1, it is characterized in that: described slurrying pond (3) is connected with circulatory pool (4) by slurry supply pump (14), circulatory pool (4) is connected 5 with sedimentation basin) adopt half general formula to connect, the bottom is respectively arranged with oxidation air pipeline (15), and oxidation air pipeline (15) is connected with oxidation fan (16) respectively.
3. a kind of magnesium oxide method flue gas desulfurization device according to claim 1, it is characterized in that: described sedimentation basin (5) is for flat flow, be provided with pulse suspension device (18) in the sedimentation basin (5), be equipped with agitating device (17) in circulatory pool (4) and slurrying pond (3).
4. magnesium oxide method fume desulphurization method according to claim 1 comprises the steps:
A. the magnesium oxide powder in magnesia powder storehouse (2) is passed in the slurrying pond (3) and make magnesium hydroxide slurry;
B. the magnesium hydroxide slurry in slurrying pond (3) passes under the effect of slurry supply pump (14) in the circulatory pool (4), absorption tower circulating pump (7) extracts magnesium hydroxide slurry in circulatory pool (4), spray magnesium hydroxide slurry washing flue gas in (1) to the absorption tower by circulating line and spraying layer (8), remove the SO in the flue gas
2
C. open oxidation fan (16), in circulatory pool (4) and sedimentation basin (5), blast air by oxidation air pipeline (15), absorption tower (1) bottom is absorbed SO
2The magnesium sulfite circulation fluid oxidation that generates generates Adlerika;
D. the insoluble impurities in the magnesium oxide powder precipitates in sedimentation basin (5), sends into plate and frame filter press (11) dehydration by deslagging pump (10), makes the filter cake outward transport;
E. sedimentation basin (a 5) upper clear supernate part is returned pump (9) by clear liquid and is delivered to slurrying pond (3) slurrying, and another part is used for sedimentation basin (5) pulse suspension device (18);
F. can get back to circulatory pool (4) or send into epsom salt Preparation equipment (13) or enter sewage treatment equipment (12) from plate and frame filter press (11) filtrate out.
5. magnesium oxide method fume desulphurization method according to claim 4 is characterized in that: described absorption tower (1) bottom is controlled to be 6.5 by the pH value that pipeline (6) enters the circulation fluid of circulatory pool (4).
6. magnesium oxide method fume desulphurization method according to claim 4, it is characterized in that: the mass concentration of Adlerika is not higher than 15% in the circulation fluid of described circulatory pool (4).
7. magnesium oxide method fume desulphurization method according to claim 4 is characterized in that: the mass percent concentration of the magnesium hydroxide slurry of preparation is 10%～30% in the described slurrying pond (3).
8. magnesium oxide method fume desulphurization method according to claim 4 is characterized in that: the magnitude of recruitment in magnesia powder foot couple slurrying pond is SO in the absorption tower by the ratio of amount in the described unit interval
21.03 for the treatment of capacity.
9. magnesium oxide method fume desulphurization method according to claim 4, it is characterized in that: described absorption tower circulating pump (7) is sent into the circulation fluid on absorption tower (1) and the liquid-gas ratio of flue gas is 5.5 liters/cubic metre.
10. magnesium oxide method fume desulphurization method according to claim 4 is characterized in that: the mass concentration of the magnesium sulfate filtrate of described plate and frame filter press (11) discharging is 15%.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387249A (en) * | 2013-07-31 | 2013-11-13 | 张卫东 | Method for producing magnesium sulfate by using sulfur paste and magnesium oxide as raw materials |
| CN106076105A (en) * | 2016-07-26 | 2016-11-09 | 江苏远东环保工程有限公司 | Magnesium oxide method single column double circulation desulphurization device |
| CN107261803A (en) * | 2017-08-16 | 2017-10-20 | 红河绿地环保科技发展有限公司 | Baffling desulfurization liquid circulating device and application method in a kind of flue gas desulphurization system |
| CN108440995A (en) * | 2018-01-15 | 2018-08-24 | 大连亚泰科技新材料股份有限公司 | A kind of method that wet method prepares modified micro-nano flame retardant of magnesium hydroxide |
| CN108686482A (en) * | 2018-07-12 | 2018-10-23 | 佛山市信利成机电设备有限公司 | Outer circulation desulphurization system and apply its outer circulation sulfur method |
| CN108939883A (en) * | 2018-07-21 | 2018-12-07 | 苏州汉力新材料有限公司 | Magnesium sulfate method and system is recycled in flue gas desulfurization |
| CN111729474A (en) * | 2020-06-10 | 2020-10-02 | 上海交通大学 | Method for circulating flue gas desulfurization and sulfur dioxide recovery by using organic acid magnesium solution |
| CN114867544A (en) * | 2020-07-15 | 2022-08-05 | 富士电机株式会社 | Exhaust gas treatment device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103387249A (en) * | 2013-07-31 | 2013-11-13 | 张卫东 | Method for producing magnesium sulfate by using sulfur paste and magnesium oxide as raw materials |
| CN106076105A (en) * | 2016-07-26 | 2016-11-09 | 江苏远东环保工程有限公司 | Magnesium oxide method single column double circulation desulphurization device |
| CN107261803A (en) * | 2017-08-16 | 2017-10-20 | 红河绿地环保科技发展有限公司 | Baffling desulfurization liquid circulating device and application method in a kind of flue gas desulphurization system |
| CN108440995A (en) * | 2018-01-15 | 2018-08-24 | 大连亚泰科技新材料股份有限公司 | A kind of method that wet method prepares modified micro-nano flame retardant of magnesium hydroxide |
| CN108686482A (en) * | 2018-07-12 | 2018-10-23 | 佛山市信利成机电设备有限公司 | Outer circulation desulphurization system and apply its outer circulation sulfur method |
| CN108939883A (en) * | 2018-07-21 | 2018-12-07 | 苏州汉力新材料有限公司 | Magnesium sulfate method and system is recycled in flue gas desulfurization |
| CN111729474A (en) * | 2020-06-10 | 2020-10-02 | 上海交通大学 | Method for circulating flue gas desulfurization and sulfur dioxide recovery by using organic acid magnesium solution |
| CN111729474B (en) * | 2020-06-10 | 2021-08-31 | 上海交通大学 | Method for circulating flue gas desulfurization and sulfur dioxide recovery by using organic acid magnesium solution |
| CN114867544A (en) * | 2020-07-15 | 2022-08-05 | 富士电机株式会社 | Exhaust gas treatment device |
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Address after: 250000 Shandong province Ji'nan City flyover District Dikou Road No. 141 Patentee after: General Technology Group Engineering Design Co., Ltd. Address before: 250000 Shandong province Ji'nan City flyover District Dikou Road No. 141 Patentee before: Coal Industry Jinan Design & Research Co., Ltd. |