CN102886199B - 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 PDF

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Publication number
CN102886199B
CN102886199B CN201210415270.XA CN201210415270A CN102886199B CN 102886199 B CN102886199 B CN 102886199B CN 201210415270 A CN201210415270 A CN 201210415270A CN 102886199 B CN102886199 B CN 102886199B
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China
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magnesium oxide
circulatory pool
absorption tower
sedimentation basin
flue gas
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CN201210415270.XA
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Chinese (zh)
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CN102886199A (en
Inventor
杨恒凯
陈公卫
陆阳
蔡琦
马继德
张新
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煤炭工业济南设计研究院有限公司
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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

A kind of magnesium oxide method flue gas desulfurization device and sulfur method
(1) technical field
The invention belongs to 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 large-sized boiler equipment desulfurization project capital construction of coal-burning power plant of China is complete, and most of professional desulfurization company turns to sight the flue gas desulfurization of Pump for Medium and Small Power Generating Set, 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 much larger than calcium-based desulfurizing agent.The current explored magnesia reserves of China are about 16,000,000,000 tons, and account for global about 80%, full-fledged magnesium oxide method sulfur removal technology is significant.
But by the follow-up investigation to magnesium oxide method desulfurizing item in recent years, find through longtime running, traditional magnesia washes and starches the-following problem of method of reproduction sulfur removal technology ubiquity: 1, complex process, investment is large; 2, magnesia regeneration rate is low.Magnesium sulfite calcination and regeneration magnesia needs the temperature of more than 800 degrees Celsius, and magnesium sulfate calcination and regeneration magnesia then needs higher temperature, and along with in system, the increase of magnesium sulfate content causes magnesia conversion ratio more and more lower; 3, actual motion cost is high.Regenerative process controls bad meeting and causes larger heat loss, consumes to reduce carbon in a large number simultaneously; 4, fouling in tower.Because magnesia regeneration rate is low, causing desulfuration efficiency to decline, is maintain higher desulfuration efficiency, and pH value needs to control more than 7, causes fouling in absorption tower after longtime running.
Above problem has had a strong impact on the application of magnesium oxide method at home in Pump for Medium and Small Power Generating Set flue gas desulfurization.
(3) summary of the invention
The present invention in order to make up the deficiencies in the prior art, provide a kind of invest little, operating cost is low, efficiency is high, can avoid desulfurizing agent huge waste and prevent magnesium oxide method flue gas desulfurization device and the sulfur method of fouling and clogging in 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, magnesia powder storehouse is communicated with slurrying pond, circulatory pool and sedimentation basin successively, the pipeline leading to circulatory pool is provided with bottom absorption tower, it is characterized in that: described circulatory pool is connected by the spraying layer of absorption tower circulating pump with top, absorption tower, sedimentation basin top returns pump by clear liquid and is connected with slurrying pond, be connected with plate and frame filter press by deslagging pump bottom sedimentation basin, be connected with sewage treatment equipment or epsom salt Preparation equipment with circulatory pool respectively bottom plate and frame filter press.
Described slurrying pond is connected with circulatory pool by slurry supply pump, and circulatory pool and sedimentation basin adopt half general formula to be connected, and bottom is respectively arranged with oxidation air pipeline, and oxidation air pipeline is connected with oxidation fan respectively.
Described sedimentation basin is flat flow, is provided with pulse suspension device in sedimentation basin, is equipped with agitating device in circulatory pool and slurrying pond.
Magnesium oxide method fume desulphurization method of the present invention, comprises the steps:
A. the magnesium oxide powder in magnesia powder storehouse is passed in slurrying pond and make magnesium hydroxide slurry;
B. the magnesium hydroxide slurry in slurrying pond passes in circulatory pool under the effect of slurry supply pump, absorption tower circulating pump extracts magnesium hydroxide slurry in circulatory pool, in absorption tower, spray magnesium hydroxide slurry washing flue gas by circulating line and spraying layer, remove the SO in flue gas 2;
C. open oxidation fan, in circulatory pool and sedimentation basin, blast air by oxidation air pipeline, absorb SO by bottom absorption tower 2the magnesium sulfite circulation fluid oxidation generated generates Adlerika;
D. the insoluble impurities in magnesium oxide powder precipitates in sedimentation basin, sends into plate and frame filter press dehydration by deslagging pump, makes 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 from plate and frame filter press filtrate out or send into epsom salt Preparation equipment or enter useless treatment facility.
The pH value being entered the circulation fluid of circulatory pool bottom described absorption tower by pipeline controls to be 6.5.
In the circulation fluid of described circulatory pool, the mass concentration of Adlerika is not higher than 15%.
The mass percent concentration of the magnesium hydroxide slurry prepared in described slurrying pond is 10% ~ 30%.
Described oxidized per unit time magnesium dust is SO in absorption tower to the magnitude of recruitment in slurrying pond by the ratio of material amount 21.03 for the treatment of capacity.
The circulation fluid on absorption tower sent into by described absorption tower circulating pump and the liquid-gas ratio of flue gas is 5.5 liters/m.
The mass concentration of the magnesium sulfate filtrate of described plate and frame filter press discharge is 15%.
Beneficial effect of the present invention is:
(1) eliminate traditional magnesia to wash and starch-method of reproduction in magnesia step for regeneration, add the multiple working procedures such as clear liquid returns, filtrate recovery and reach 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, after entering circulatory pool from desulfurizing tower, direct oxidation is Adlerika, avoids fouling and alluvial, saves investment cost;
(3) sulfur removal technology adopts plate and frame filtering equipment, compared to vacuum belt dewaterer with drag for slag equipment, has greatly saved space and investment;
(4) enterprise from main separation wastewater treatment mode, can comprise the epsom salt reclaimed in discharge waste liquid and reduces operating cost further or directly enter sewage treatment plant's process.
Instant invention overcomes conventional oxidation magnesium to wash and starch-method of reproduction sulfur removal technology complexity, invest the shortcomings such as high, magnesia regeneration rate is low, energy consumption is high, operating cost is high; especially be applicable to domestic Pump for Medium and Small Power Generating Set flue gas desulfurization, positive role is served to China's comprehensive utilization of energy and environmental protection.
(4) accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is apparatus structure schematic diagram of the present invention.
In 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) detailed description of the invention
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, the pipeline 6 leading to circulatory pool 4 is provided with bottom absorption tower 1, 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 returns pump 9 by clear liquid and is connected with slurrying pond 3, be connected with plate and frame filter press 11 by deslagging pump 10 bottom sedimentation basin 5, be connected with sewage treatment equipment 12 or epsom salt Preparation equipment 13 with circulatory pool 4 respectively bottom plate and frame filter press 11.Slurrying pond 3 is connected with circulatory pool 4 by slurry supply pump 14, and circulatory pool 4 and sedimentation basin 5 adopt half general formula to be connected, and 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 sedimentation basin 5, is equipped with agitating device 17 in circulatory pool 4 and slurrying pond 3.
Magnesium oxide method fume desulphurization method of the present invention, comprises the steps: that the magnesium oxide powder in magnesia powder storehouse 2 passes in slurrying pond 3 by (1) and makes magnesium hydroxide slurry; (2) magnesium hydroxide slurry in slurrying pond 3 passes in circulatory pool 4 under the effect of slurry supply pump 14, absorption tower circulating pump 7 extracts magnesium hydroxide slurry in circulatory pool 4, in absorption tower 1, spray magnesium hydroxide slurry washing flue gas by circulating line and spraying layer 8, remove the SO in flue gas 2; (3) open oxidation fan 16, in circulatory pool 4 and sedimentation basin 5, blast air by oxidation air pipeline 15, absorb SO by bottom absorption tower 1 2the magnesium sulfite circulation fluid oxidation generated generates Adlerika; (4) insoluble impurities in magnesium oxide powder precipitates in sedimentation basin 5, sends into plate and frame filter press 11 dewater by deslagging pump 10, makes filter cake outward transport; (5) a sedimentation basin 5 upper clear supernate part returns pump 9 by clear liquid and delivers to slurrying pond 3 slurrying, and another part is used for sedimentation basin 5 pulse suspension device 18; (6) circulatory pool 4 can be got back to from plate and frame filter press 11 filtrate out or send into epsom salt Preparation equipment 13 or enter sewage treatment equipment 12.
Absorption tower 1 of the present invention and circulatory pool 4 separate, and absorption tower circulating pump 7 extracts circulation fluid from the circulatory pool 4 be arranged on absorption tower 1 and sprays in absorption tower 1, and flue gas rises to contact with circulation fluid and washs scrubbing CO_2 in absorption tower 1.Circulatory pool 4 and sedimentation basin 5 are semi-connected forms, and from a structural point, sedimentation basin 5 is rectangular sedimentation tank, has the advantage that structure is simple, deposition efficiency is high.Sedimentation basin 5 functionally mainly removes the insoluble impurities in magnesia powder, and sedimentation basin 5 is provided with pulse suspension device 18 and accumulated slag hole, ensures the high-efficiency operation of dreg removing system.
Tower outer circulation magnesium oxide method sulfur removal technology of the present invention, first outside factory, powder tank car ships the outsourcing magnesia powder feeding magnesia powder storehouse 2 of more than 200 orders, magnesia powder is added to slurrying pond 3 by the metering device be located at bottom magnesia powder storehouse 2, by the control to plant area's fresh water (FW) and sedimentation basin 5 supernatant flow, make the magnesium hydroxide slurry that mass percent concentration is 10-30%.
When system is just run, fill the magnesium hydroxide slurry of 5% in circulatory pool 4, the volume of circulatory pool 4 will ensure under liquid-gas ratio reaches the condition of 5.5 liters/standard cubic meter, ensures the plasma discharge amount of 5 ~ 8 minutes when absorption tower circulating pump 7 is all opened.
The pH value being entered the circulation fluid of circulatory pool 4 bottom absorption tower 1 by pipeline 6 controls to be 6.5, and the circulation fluid that the end, absorption tower 1 is discharged is subacidity, fouling in anti-locking system.
For ensureing that system reaches stably desulphurizing operational effect, the circulation fluid Adlerika mass concentration in circulatory pool 4 can not more than 15%.
The filtrate that plate and frame filter press 11 is discharged is after collecting, as magnesium sulfate mass concentration returns circulatory pool 4 lower than 15%, if magnesium sulfate mass concentration is higher than 15% integrated treatment, 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: eliminate traditional magnesia to wash and starch-method of reproduction in magnesia step for regeneration; Add the multiple working procedures such as clear liquid returns, filtrate recovery and reach the maximum utilization of resources; Enterprise from main separation wastewater treatment mode, can comprise the epsom salt reclaimed in discharge waste liquid and reduces operating cost further or directly enter sewage treatment plant's process.
Main points of the present invention are: 1, absorption tower 1 exports circulation fluid pH value is key control parameter, to the control of pH value and desulfurization absorbent feeding coal, should ensure that absorption tower 1 exports the pH value of circulation fluid within the specific limits, ensure that the quantity delivered of magnesium hydroxide slurry can not be too high again, otherwise easily cause 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, after entering circulatory pool from absorption tower 1, direct oxidation is Adlerika, avoids fouling and alluvial, saves investment cost.3, desulphurization system discharge Adlerika concentration is key control parameter, and too high meeting causes SO 2dividing potential drop increases impact and absorbs, too low, causes the wasting of resources.4, sulfur removal technology adopts plate and frame filtering equipment, compared to vacuum belt dewaterer with drag for slag equipment, has greatly saved space and investment.
Instant invention overcomes conventional oxidation magnesium to wash and starch-method of reproduction sulfur removal technology complexity, invest the shortcomings such as high, magnesia regeneration rate is low, energy consumption is high, operating cost is high; especially be applicable to domestic Pump for Medium and Small Power Generating Set flue gas desulfurization, positive role is served to China's comprehensive utilization of energy and environmental protection.

Claims (8)

1. a 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) leading to circulatory pool (4), it is characterized in that: described circulatory pool (4) is connected with the spraying layer (8) on absorption tower (1) top by absorption tower circulating pump (7), sedimentation basin (5) top returns 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), 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, slurrying pond (3) is connected with circulatory pool (4) by slurry supply pump (14), circulatory pool (4) adopts half general formula to be connected with sedimentation basin (5), bottom is respectively arranged with oxidation air pipeline (15), oxidation air pipeline (15) is connected with oxidation fan (16) respectively, sedimentation basin (5) is flat flow, pulse suspension device (18) is provided with in sedimentation basin (5), agitating device (17) is equipped with in circulatory pool (4) and slurrying pond (3).
2. magnesium oxide method flue gas desulfurization device according to claim 1 carries out a method for magnesium oxide method flue gas desulfurization, comprises the steps:
A. the magnesium oxide powder in magnesia powder storehouse (2) is passed in slurrying pond (3) and make magnesium hydroxide slurry;
B. the magnesium hydroxide slurry in slurrying pond (3) passes in circulatory pool (4) under the effect of slurry supply pump (14), absorption tower circulating pump (7) extracts magnesium hydroxide slurry in circulatory pool (4), the spray magnesium hydroxide slurry washing flue gas in absorption tower (1) by circulating line and spraying layer (8), removes the SO in 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 generated generates Adlerika;
D. the insoluble impurities in magnesium oxide powder is precipitation in sedimentation basin (5), sends into plate and frame filter press (11) dehydration by deslagging pump (10), makes filter cake outward transport;
E. sedimentation basin (5) upper clear supernate part returns pump (9) by clear liquid and delivers 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) from plate and frame filter press (11) filtrate out or send into epsom salt Preparation equipment (13) or enter sewage treatment equipment (12).
3. magnesium oxide method fume desulphurization method according to claim 2, is characterized in that: the pH value that described absorption tower (1) bottom enters the circulation fluid of circulatory pool (4) by pipeline (6) controls to be 6.5.
4. magnesium oxide method fume desulphurization method according to claim 2, is characterized in that: in the circulation fluid of described circulatory pool (4), the mass concentration of Adlerika is not higher than 15%.
5. magnesium oxide method fume desulphurization method according to claim 2, is characterized in that: in described slurrying pond (3), the mass percent concentration of the magnesium hydroxide slurry of preparation is 10% ~ 30%.
6. magnesium oxide method fume desulphurization method according to claim 2, is characterized in that: oxidized per unit time magnesium dust is SO in absorption tower to the magnitude of recruitment in slurrying pond by the ratio of material amount 21.03 for the treatment of capacity.
7. magnesium oxide method fume desulphurization method according to claim 2, is characterized in that: the circulation fluid on absorption tower (1) is sent on described absorption tower circulating pump (7) and the liquid-gas ratio of flue gas is 5.5 liters/m.
8. magnesium oxide method fume desulphurization method according to claim 2, is characterized in that: the mass concentration of the magnesium sulfate filtrate that described plate and frame filter press (11) discharges is 15%.
CN201210415270.XA 2012-10-26 2012-10-26 Flue gas desulfurization device and desulfurization method by magnesium oxide process CN102886199B (en)

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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
CN107261803B (en) * 2017-08-16 2020-02-07 红河绿地环保科技发展有限公司 Baffling desulfurization liquid circulating device in flue gas desulfurization system and using method
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
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

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Publication number Priority date Publication date Assignee Title
CN101658760A (en) * 2009-09-17 2010-03-03 六合天融(北京)环保科技有限公司 Flue gas desulfurization technology applicable to calcium and magnesium desulfuraters
CN102284239A (en) * 2011-06-16 2011-12-21 煤炭工业济南设计研究院有限公司 Desulfurization process and device based on out-of-tower circulation and independent oxidization dual-alkali methods
CN202860398U (en) * 2012-10-26 2013-04-10 煤炭工业济南设计研究院有限公司 Flue gas desulfurization device by magnesium oxide method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101658760A (en) * 2009-09-17 2010-03-03 六合天融(北京)环保科技有限公司 Flue gas desulfurization technology applicable to calcium and magnesium desulfuraters
CN102284239A (en) * 2011-06-16 2011-12-21 煤炭工业济南设计研究院有限公司 Desulfurization process and device based on out-of-tower circulation and independent oxidization dual-alkali methods
CN202860398U (en) * 2012-10-26 2013-04-10 煤炭工业济南设计研究院有限公司 Flue gas desulfurization device by magnesium oxide method

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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.