CN106621701B - Flue gas desulfurization system - Google Patents
Flue gas desulfurization system Download PDFInfo
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- CN106621701B CN106621701B CN201611187075.0A CN201611187075A CN106621701B CN 106621701 B CN106621701 B CN 106621701B CN 201611187075 A CN201611187075 A CN 201611187075A CN 106621701 B CN106621701 B CN 106621701B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a flue gas desulfurization system. The flue gas desulfurization system comprises a first-stage adsorption tower and a second-stage adsorption tower which are sequentially communicated, wherein a bubbling bed is arranged in the first-stage adsorption tower, a fast bed is arranged in the second-stage adsorption tower, and powdery activated carbon is filled in the first-stage adsorption tower and the second-stage adsorption tower. By applying the technical scheme of the invention, the fluidized bed double-tower adsorption with the activated carbon as the desulfurization adsorbent is adopted, wherein the first-stage adsorption is a bubbling bed to ensure the sufficient contact time of the activated carbon and the flue gas, and the second-stage adsorption is a rapid bed to deeply purify the flue gas. The double-tower design can improve the effective utilization rate of sulfur capacity of the outlet adsorbent on the basis of ensuring the overall desulfurization efficiency, and meanwhile, the adsorbent activated carbon participates in the reaction in a powdery form, so that the mechanical loss of the activated carbon is reduced, the overall utilization rate is improved, and the desulfurization energy consumption and the consumption of the activated carbon can be reduced.
Description
Technical Field
The invention relates to the field of removal of sulfur dioxide in flue gas pollutants, in particular to a flue gas desulfurization system.
Background
The activated carbon desulfurization is a flue gas desulfurization technology which can be recycled, has an obvious effect of removing pollutants such as heavy metals in flue gas, and has wide development and application prospects.
The existing activated carbon desulfurization technology is mainly a moving bed adsorption-heating regeneration process route. The activated carbon adopted by the moving bed adsorption process is shaped activated carbon with high mechanical strength, and generally is columnar activated carbon with the diameter of phi 5-9mm in industrial application. However, the inner surface utilization rate is low due to the large diffusion resistance in the columnar activated carbon; the crushing and abrasion in the conveying process cause mechanical loss, so that the operation cost is increased; in addition, the column molding process is complicated, and the cost of the activated carbon is increased. Another activated carbon desulfurization technology is a process route of fluidized bed adsorption of powdered activated carbon, which avoids mechanical loss caused by abrasion of the columnar activated carbon, has relatively low cost of the powdered activated carbon, and improves the surface utilization rate of the powdered activated carbon relative to the columnar activated carbon. But the adsorption process of the fluidized bed has low effective utilization rate of the sulfur capacity of the activated carbon, and energy waste in the regeneration process is caused.
Disclosure of Invention
The invention aims to provide a flue gas desulfurization system to improve the effective utilization rate of activated carbon to sulfur adsorption.
To achieve the above object, according to one aspect of the present invention, there is provided a flue gas desulfurization system. The flue gas desulfurization system comprises a first-stage adsorption tower and a second-stage adsorption tower which are sequentially communicated, wherein a bubbling bed is arranged in the first-stage adsorption tower, a fast bed is arranged in the second-stage adsorption tower, and powdery activated carbon is filled in the first-stage adsorption tower and the second-stage adsorption tower.
Further, the flue gas desulfurization system also comprises a cyclone separator; the bottom of the first-level adsorption tower is provided with a flue gas inlet, the top of the first-level adsorption tower is provided with a flue gas outlet, the flue gas outlet is communicated with a cyclone separator, and the cyclone separator is used for separating flue gas and activated carbon coming out of the first-level adsorption tower.
Furthermore, the flue gas desulfurization system also comprises a circulating carbon bin, a spent carbon gas locking feeder, a circulating carbon gas locking feeder and a spent carbon bin; the active carbon separated by the cyclone separator enters a circulating carbon bin, one part of the active carbon in the circulating carbon bin enters the spent carbon bin through a spent carbon gas-locking feeder, and the other part of the active carbon in the circulating carbon bin is sent back to the first-stage adsorption tower through the circulating carbon gas-locking feeder.
Furthermore, the flue gas desulfurization system also comprises a fresh activated carbon bin and a fresh activated carbon air-locking feeder, wherein the fresh activated carbon bin is used for storing fresh activated carbon or regenerated activated carbon; and conveying the activated carbon in the fresh activated carbon bin to the secondary adsorption tower through a fresh activated carbon air-locking feeder.
Further, the flue gas desulfurization system also comprises a bag-type dust collector, wherein the bag-type dust collector is used for separating flue gas and active carbon from the secondary adsorption tower.
Furthermore, the flue gas desulfurization system also comprises a primary carbon gas locking feeder, and the activated carbon collected by the bag-type dust remover is sent to the primary adsorption tower through the primary carbon gas locking feeder.
Further, the bag-type dust collector is provided with a chimney, and the chimney is used for exhausting the smoke.
Further, the carbon-lack bin is communicated with an active carbon regeneration system.
And further, the activated carbon regenerated by the activated carbon regeneration system is sent back to the fresh activated carbon bin through a regenerated catalyst feeder.
By applying the technical scheme of the invention, the fluidized bed double-tower adsorption with the activated carbon as the desulfurization adsorbent is adopted, wherein the first-stage adsorption is a bubbling bed to ensure the sufficient contact time of the activated carbon and the flue gas, and the second-stage adsorption is a rapid bed to deeply purify the flue gas. The double-tower design can improve the effective utilization rate of sulfur capacity of the outlet adsorbent on the basis of ensuring the overall desulfurization efficiency, and meanwhile, the adsorbent activated carbon participates in the reaction in a powdery form, so that the mechanical loss of the activated carbon is reduced, the overall utilization rate is improved, and the desulfurization energy consumption and the consumption of the activated carbon can be reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic configuration of a flue gas desulfurization system according to embodiment 1 of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
According to an exemplary embodiment of the present invention, a flue gas desulfurization system is provided. The flue gas desulfurization system comprises a first-stage adsorption tower and a second-stage adsorption tower which are sequentially communicated, wherein a bubbling bed is arranged in the first-stage adsorption tower, a fast bed is arranged in the second-stage adsorption tower, and powdery activated carbon is filled in the first-stage adsorption tower and the second-stage adsorption tower.
The invention relates to fluidized bed double-tower adsorption with active carbon as a desulfurization adsorbent, wherein, the first adsorption is a bubbling bed to ensure the sufficient contact time of the active carbon and flue gas, and the second adsorption is a fast bed to deeply purify the flue gas. The double-tower design can improve the effective utilization rate of sulfur capacity of the outlet adsorbent on the basis of ensuring the overall desulfurization efficiency, and meanwhile, the adsorbent activated carbon participates in the reaction in a powdery form, so that the mechanical loss of the activated carbon is reduced, the overall utilization rate is improved, and the desulfurization energy consumption and the consumption of the activated carbon can be reduced.
According to an exemplary embodiment of the invention, the flue gas desulfurization system further comprises a cyclone separator; the bottom of the first-level adsorption tower is provided with a flue gas inlet, the top of the first-level adsorption tower is provided with a flue gas outlet, the flue gas outlet is communicated with a cyclone separator, and the cyclone separator is used for separating flue gas and activated carbon coming out of the first-level adsorption tower.
Preferably, the flue gas desulfurization system further comprises a circulating carbon bin, a spent carbon gas-locking feeder, a circulating carbon gas-locking feeder and a spent carbon bin; the active carbon separated by the cyclone separator enters a circulating carbon bin, one part of the active carbon in the circulating carbon bin enters the spent carbon bin through a spent carbon gas-locking feeder, and the other part of the active carbon in the circulating carbon bin is sent back to the first-stage adsorption tower through the circulating carbon gas-locking feeder. In the invention, the feeding adopts the feeding machine, thus preventing air leakage.
According to a typical embodiment of the present invention, the flue gas desulfurization system further comprises a fresh activated carbon bin and a fresh activated carbon airlock feeder, wherein the fresh activated carbon bin is used for storing fresh activated carbon or regenerated activated carbon; and conveying the activated carbon in the fresh activated carbon bin to the secondary adsorption tower through a fresh activated carbon air-locking feeder.
Preferably, the flue gas desulfurization system further comprises a bag-type dust collector, and the bag-type dust collector is used for separating flue gas and activated carbon from the secondary adsorption tower.
Preferably, the flue gas desulfurization system further comprises a primary carbon gas locking feeder, and the activated carbon collected by the bag-type dust collector is sent to the primary adsorption tower through the primary carbon gas locking feeder.
According to a typical embodiment of the invention, the bag-type dust collector is provided with a chimney for flue gas evacuation.
Preferably, the carbon-lack bin is communicated with an active carbon regeneration system.
Preferably, the activated carbon regenerated by the activated carbon regeneration system is returned to the fresh activated carbon bin through the regenerated catalyst feeder.
The following examples are provided to further illustrate the advantageous effects of the present invention.
Example 1
The flue gas desulfurization system shown in fig. 1 comprises a spent carbon bin 1, a spent carbon gas-locking feeder 2, a circulating carbon gas-locking feeder 3, a circulating carbon bin 4, a cyclone separator 5, a primary adsorption tower 6, a bag-type dust collector 7, a secondary adsorption tower 8, a primary carbon gas-locking feeder 9, a fresh activated carbon bin 10 and a fresh activated carbon gas-locking feeder 11.
One-level adsorption tower 6 links to each other with cyclone 5, cyclone 5 links to each other with circulation charcoal storehouse 4 and second grade adsorption tower 8, wherein circulation charcoal storehouse 4 links to each other with exhaust charcoal lock gas batcher 2 and circulation charcoal lock gas batcher 3, circulation charcoal lock gas batcher 3 links to each other with one-level adsorption tower 5, exhaust charcoal lock gas batcher 2 links to each other with exhaust charcoal storehouse 1, second grade adsorption tower 8 links to each other with sack cleaner 7, sack cleaner 7 links to each other with a charcoal lock gas batcher 9, a charcoal lock gas batcher 9 links to each other with one-level adsorption tower 6, fresh activated carbon storehouse 10 links to each other with fresh activated carbon lock gas batcher 11, fresh activated carbon lock gas batcher 11 links to each other with second grade adsorption tower 8.
Flue gas from the coal-fired boiler enters the primary adsorption tower 6 from a flue gas inlet at the bottom of the primary adsorption tower 6. In the first-stage adsorption tower 6, activated carbon is adsorbed in a bubbling bed mode, enters a second-stage adsorption tower 8 after passing through a cyclone separator 5, enters a bag-type dust collector 7 through an outlet of the second-stage adsorption tower 8, and then enters a chimney for emptying. Wherein, the active carbon carried by the flue gas in the first-stage adsorption tower 6 is caught by the cyclone separator 5 and enters the circulating charcoal bin 4, one part of the active carbon in the circulating charcoal bin 4 enters the spent charcoal bin 1 through the spent charcoal airlock feeder 2, and one part of the active carbon is sent back to the first-stage adsorption tower 6 through the circulating charcoal airlock feeder 3. And the activated carbon in the spent carbon bin 1 is sent into a regeneration system for regeneration, and is sent back to the fresh activated carbon bin 11 after the regeneration is finished. The active carbon in the second-stage absorption tower 8 finishes the absorption of sulfur dioxide in the flue gas in a fast bed mode, the active carbon enters the bag-type dust remover 7 along with the flue gas, and the active carbon in the flue gas is caught and collected and is sent to the first-stage absorption tower 6 through the primary carbon gas locking feeder 9.
The fresh activated carbon bin 10 is used for storing freshly prepared activated carbon and fresh activated carbon which has fresh desulfurization capability after one or more desulfurization is completed and regeneration is performed. The particle size of the fresh activated carbon is less than 10 mm. Fresh activated carbon is fed into the secondary adsorption tower 8 through a fresh activated carbon air-locking feeder 11.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1) the powdered activated carbon is used as an adsorbent, so that the cost is low and the mechanical loss is low;
2) the gas-solid contact of the two-stage adsorption tower is sufficient, and the utilization rate of the adsorbent is high;
3) two-stage adsorption, wherein the first-stage adsorption is a bubbling bed to ensure the sufficient contact time of the active carbon and the flue gas, and the second-stage adsorption is a rapid bed to deeply purify the flue gas. The double-tower design can improve the effective utilization rate of the sulfur capacity of the outlet adsorbent on the basis of ensuring the overall desulfurization efficiency.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A flue gas desulfurization system is characterized by comprising a primary adsorption tower (6) and a secondary adsorption tower (8) which are sequentially communicated, wherein a bubbling bed is arranged in the primary adsorption tower (6), a fast bed is arranged in the secondary adsorption tower (8), and powdery activated carbon is filled in the primary adsorption tower (6) and the secondary adsorption tower (8);
also comprises a cyclone separator (5);
a flue gas inlet is formed in the bottom of the primary adsorption tower (6), a flue gas outlet is formed in the top of the primary adsorption tower, the flue gas outlet is communicated with the cyclone separator (5), and the cyclone separator (5) is used for separating flue gas and activated carbon from the primary adsorption tower (6);
the system also comprises a circulating charcoal bin (4), a spent charcoal gas-locking feeder (2), a circulating charcoal gas-locking feeder (3) and a spent charcoal bin (1); the activated carbon separated by the cyclone separator (5) enters the circulating carbon bin (4), one part of the activated carbon in the circulating carbon bin (4) enters the spent carbon bin (1) through the spent carbon gas-locking feeder (2), and the other part of the activated carbon is sent back to the primary adsorption tower (6) through the circulating carbon gas-locking feeder (3);
the device also comprises a fresh activated carbon bin (10) and a fresh activated carbon air-locking feeder (11), wherein the fresh activated carbon bin (10) is used for storing fresh activated carbon or regenerated activated carbon; and the activated carbon in the fresh activated carbon bin (10) is conveyed into the secondary adsorption tower (8) through the fresh activated carbon air-locking feeder (11).
2. The flue gas desulfurization system according to claim 1, further comprising a bag-type dust collector (7), wherein the bag-type dust collector (7) is used for separating flue gas and activated carbon from the secondary adsorption tower (8).
3. The flue gas desulfurization system of claim 2, further comprising a primary charcoal gas-locking feeder (9), wherein the activated charcoal collected by the bag-type dust collector (7) is fed into the primary adsorption tower (6) through the primary charcoal gas-locking feeder (9).
4. A flue gas desulfurization system according to claim 2, characterized in that the bag-type dust remover (7) is provided with a chimney for flue gas evacuation.
5. The flue gas desulfurization system of claim 1, wherein the spent carbon silo (1) is in communication with an activated carbon regeneration system.
6. The flue gas desulfurization system according to claim 5, wherein the activated carbon regenerated by the activated carbon regeneration system is returned to the fresh activated carbon silo (10) by a regenerated catalyst feeder.
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| CN201611187075.0A CN106621701B (en) | 2016-12-20 | 2016-12-20 | Flue gas desulfurization system |
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| CN201611187075.0A CN106621701B (en) | 2016-12-20 | 2016-12-20 | Flue gas desulfurization system |
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| CN106621701B true CN106621701B (en) | 2020-09-11 |
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Families Citing this family (7)
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| CN108939806A (en) * | 2017-05-24 | 2018-12-07 | 山东盛华投资有限责任公司 | It is a kind of using absorption in bulk and/or the flue gas purification device of adsorbent |
| CN108144443B (en) * | 2018-02-05 | 2023-10-03 | 山东大学 | System and method for combined desulfurization and denitration of powdery active coke |
| CN108217650B (en) * | 2018-02-06 | 2021-04-09 | 西南石油大学 | Device for preparing activated carbon and performing adsorption desulfurization |
| CN108722114A (en) * | 2018-08-08 | 2018-11-02 | 国家能源投资集团有限责任公司 | Powdered activated coke adsorpting desulfurization device and the method that absorption desulfurization is carried out to flue gas using it |
| CN111773915B (en) * | 2020-06-10 | 2022-07-15 | 上海交通大学 | Flue gas dry desulfurization process |
| CN112121591A (en) * | 2020-07-24 | 2020-12-25 | 中国科学院过程工程研究所 | Low-temperature flue gas activated carbon and catalytic filter tube composite purification process and application thereof |
| CN113230826A (en) * | 2021-05-17 | 2021-08-10 | 安徽徽柏环保科技有限公司 | Cadmium-containing flue gas cadmium oxide heavy metal recovery and purification process |
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