CN112807934A - Rotary treatment device for nitrogen oxides in flue gas and method for treating flue gas by rotary treatment device - Google Patents
Rotary treatment device for nitrogen oxides in flue gas and method for treating flue gas by rotary treatment device Download PDFInfo
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- CN112807934A CN112807934A CN202110253110.9A CN202110253110A CN112807934A CN 112807934 A CN112807934 A CN 112807934A CN 202110253110 A CN202110253110 A CN 202110253110A CN 112807934 A CN112807934 A CN 112807934A
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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
- B01D53/04—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 stationary adsorbents
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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
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
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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
- B01D2257/20—Halogens or halogen compounds
- B01D2257/206—Organic halogen compounds
- B01D2257/2064—Chlorine
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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
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention relates to the technical field of flue gas denitration, in particular to a rotary type treatment device for nitrogen oxides in flue gas and a method for treating the flue gas by using the rotary type treatment device. The device comprises a central cylinder and a rotating shaft for driving the central cylinder to rotate; the interior of the central cylinder is divided into an active coke adsorption area, an active coke regeneration area and a transition area positioned between the active coke adsorption area and the active coke regeneration area, and the transition area is used for isolating the active coke adsorption area and the active coke regeneration area; the active coke adsorption area is communicated with the flue gas inlet pipeline and the flue gas outlet pipeline, and the active coke regeneration area is communicated with the nitrogen gas inlet pipeline and the nitrogen gas outlet pipeline. The device organically optimizes and integrates the adsorption and active coke regeneration links related to the active coke dry denitration technology, and the central cylinder is driven to rotate through the central rotating shaft, so that the adsorption and regeneration of the active coke in the cylinder are continuously carried out in the rotating process.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to a rotary type treatment device for nitrogen oxides in flue gas and a method for treating the flue gas by using the rotary type treatment device.
Background
Coal-fired power plant is SO2Main emission sources of pollutants such as nitrogen oxides (NOx) and dust. At present, the denitration mode mainly used by a coal-fired power plant is a catalytic denitration reduction mode (SCR), the technology of the denitration mode is mature, the denitration mode is widely applied, however, the concentration of fly ash of the denitration mode is high, a catalyst is easy to wear, block and poison, and the problem of treatment of a large amount of waste catalysts after the service life is over can be caused. The active coke denitration is a process for generating steam and nitrogen by surface reaction of flue gas and ammonia gas adsorbed by active coke, wherein the denitration agent active coke can be recycled, the denitration efficiency is over 95 percent, and the active coke denitration exhaustThe smoke temperature is low, and smoke heating equipment is not needed.
At present, an active coke flue gas purification device consists of an active coke adsorption tower, a regeneration tower and an active coke conveying system. The active coke after adsorbing the flue gas is sent to the regeneration tower by the conveying device for regeneration, and the active coke with the adsorption performance recovered after regeneration is sent back to the adsorption tower through the conveying device to adsorb the flue gas. In the transportation process of active burnt, the collision between active burnt and each device casing and the active burnt cylinder can cause the active burnt damage of high pressure design, has increased the loss of active burnt, influences its adsorption effect, and active burnt design processing needs a large amount of energy resource consumptions, and processingequipment area is great, and material transportation process still can take place gas leakage and raise dust and fire incident, is unfavorable for realizing stable transport.
Disclosure of Invention
The invention provides a rotary treatment device for treating nitrogen oxides in flue gas and a method for treating the flue gas by using the rotary treatment device, which can reduce the abrasion and loss of active coke in the conveying process and fire accidents, reduce the energy waste of the processing and shaping of the active coke, reduce the pollution of environment dust, cancel the long-distance conveying of the active coke in a system and reduce the occupied area of the device. In order to achieve the purpose, the invention adopts the following technical scheme:
rotary treatment device for nitrogen oxides in flue gas, comprising: the central cylinder and a rotating shaft used for driving the central cylinder to rotate;
the interior of the central cylinder is divided into an active coke adsorption area, an active coke regeneration area and a transition area positioned between the active coke adsorption area and the active coke regeneration area, and the transition area is used for isolating the active coke adsorption area and the active coke regeneration area;
the active coke adsorption area is communicated with the flue gas inlet pipeline and the flue gas outlet pipeline, and the active coke regeneration area is communicated with the nitrogen gas inlet pipeline and the nitrogen gas outlet pipeline.
In a further optimization scheme, the processing device further comprises an outer shell, the outer shell is located outside the central cylinder, and the flue gas inlet pipeline, the flue gas outlet pipeline, the nitrogen gas inlet pipeline and the nitrogen gas outlet pipeline are arranged on the outer shell.
In a further optimized scheme, the active coke adsorption area and the active coke regeneration area are in a fan shape of 160 degrees, and the transition area is in a fan shape of 20 degrees.
In a further optimization scheme, the active coke adsorption area and the active coke regeneration area are filled with active coke, and the transition area is filled with a heat-insulating material.
In a further optimization scheme, the active coke is arranged in an active coke adsorption area and an active coke regeneration area in a layered honeycomb structure, and the density of the active coke is 450-500 kg/m3。
In a further optimization scheme, partition plates are arranged among the active coke adsorption area, the active coke regeneration area and the transition area, one end of each partition plate, which faces the center shaft of the center barrel, is fixed on the rotating shaft, the other end of each partition plate is fixed with the wall of the center barrel, and sealing strips are arranged at two ends of each partition plate.
The method for treating the flue gas by using the rotary treatment device for the nitric oxides in the flue gas comprises the following steps:
introducing flue gas mixed with ammonia gas into the active coke adsorption zone, allowing the flue gas to enter the active coke adsorption zone from a flue gas inlet pipeline, reacting with the active coke to adsorb nitrogen oxides, and allowing the purified flue gas to flow out from a flue gas outlet pipeline;
nitrogen enters an active coke regeneration area from a nitrogen inlet pipeline, and the nitrogen heats and regenerates the saturated active coke;
the rotating shaft continuously drives the central cylinder to rotate, and the active coke is alternately contacted with the flue gas and the nitrogen gas to perform adsorption and regeneration circulation.
In a further optimized scheme, the adsorption temperature range of the active coke is 200-250 ℃, and the regeneration temperature range of the active coke is 300-450 ℃.
In a further optimization scheme, the rotating speed of the rotating shaft is 1-5 revolutions per minute.
The invention has the beneficial effects that:
1. the invention develops a rotary integrated device for purifying nitrogen oxides in active coke flue gas, and provides a novel device and a novel method for an integrated mode of a flue gas treatment device for active coke.
2. The invention can complete the adsorption and regeneration of active coke in a central cylinder rotary device simultaneously, stably and continuously, and reduce the occupied area of the denitration device.
3. The invention effectively utilizes the active coke, not only can remove the nitrogen oxide in the flue gas, but also can remove part of SO2Dioxin, HF, heavy metal mercury and other pollutants.
4. The flue gas regenerated from the device can realize ultralow emission removal of nitrogen oxides, realize cyclic economic utilization of active coke and reduce the removal cost of nitrogen oxides in the flue gas.
Drawings
FIG. 1 is a first schematic structural diagram of a rotary processing apparatus for nitrogen oxides in flue gas according to the present invention.
FIG. 2 is a schematic structural diagram of a rotary processing apparatus for nitrogen oxides in flue gas according to the present invention.
FIG. 3 is a schematic structural diagram of a central cylinder, a rotating shaft, a partition plate and a sealing strip of the rotary treatment device for nitrogen oxides in flue gas.
FIG. 4 is a top view of the central cylinder of the rotary flue gas treating apparatus for nitrogen oxides.
In the attached drawing, 1 is an active coke adsorption area, 2 is an active coke regeneration area, 3 is a transition area, 4 is a rotating shaft, 5 is a partition plate, 51 is a sealing strip, 6 is active coke, 7 is a central cylinder, 8 is an outer shell, 9 is a flue gas inlet pipeline, 10 is a flue gas outlet pipeline, 11 is a nitrogen gas inlet pipeline, and 12 is a nitrogen gas outlet pipeline.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments for understanding the technical solutions of the present invention, but the present invention is not limited to the scope of the present invention.
As shown in fig. 1 to 4, the rotary processing apparatus for nitrogen oxides in flue gas of the present embodiment includes an outer casing 8 and a central cylinder 7 disposed in the outer casing 8.
The shell 8 is cylindrical, and the shell 8 is fixed in the using process and plays roles in external sealing and supporting and protecting the whole device.
The active coke regeneration device is characterized in that an active coke adsorption area 1, an active coke regeneration area 2 and a transition area 3 located between the active coke adsorption area 1 and the active coke regeneration area 2 are arranged in the central cylinder 7, the active coke adsorption area 1 and the active coke regeneration area 2 are both in a fan shape of 160 degrees and are symmetrically arranged by a central cylinder rotating shaft, active coke 6 is filled in the active coke adsorption area 1 and the active coke regeneration area 2, the active coke 6 is arranged in the active coke adsorption area 1 and the active coke regeneration area 2 in a layered honeycomb structure, and the active coke density is designed to be 450-500 kg/m3The optimal dosage of the active coke can also be determined by combining the total volume of the active coke adsorption zone 1 and the active coke regeneration zone 2, the flow rate of the treated flue gas and the concentration of nitrogen oxides (NOx). The two transition areas 3 are arranged between the active coke adsorption area 1 and the active coke regeneration area 2 and are both in a 20-degree fan shape, the transition areas 3 are filled with heat-insulating materials which can be heat-insulating cotton, the transition areas 3 are used for isolating the active coke adsorption area 1 and the active coke regeneration area 2 so as to isolate smoke and nitrogen, prevent the mixture of the smoke and the nitrogen and reduce heat transfer between the areas, realize the sealing and heat insulation of the active coke adsorption area 1 and the active coke regeneration area 2 and ensure the adsorption and desorption effects of the active coke adsorption area 1 and the active coke regeneration area 2. The reasonable area division of the active coke adsorption area 1, the active coke regeneration area 2 and the transition area 3 can ensure the smooth proceeding of the active coke adsorption and regeneration.
A partition plate 5 is arranged among the active coke adsorption area 1, the active coke regeneration area 2 and the transition area 3, one end of the partition plate 5 facing to the center shaft of the center cylinder 7 is fixed on the rotating shaft 4, the other end of the partition plate is fixed with the inner wall of the center cylinder 7, and sealing strips 51 are arranged at two ends of the partition plate 5. The arrangement of the partition plates 5 and the sealing strips 51 isolates the mutual communication of gases among the active coke adsorption zone 1, the active coke regeneration zone 2 and the transition zone 3 from axial and radial directions, and prevents the mixing of different gases. When the device is used, the rotating shaft 4 drives the central cylinder 7 to rotate at a designed rotating speed through the motor driving device at the lower part, and the rotating speed is 1-5 revolutions per minute.
A flue gas inlet pipeline 9 and a flue gas outlet pipeline 10 are arranged on a shell 8 of the device corresponding to the active coke adsorption area 1, and the flue gas inlet pipeline 9 and the flue gas outlet pipeline 10 are communicated with the active coke adsorption area 1; a nitrogen inlet pipeline 11 and a nitrogen outlet pipeline 12 are arranged on the shell 8 corresponding to the active coke regeneration area 2, and the nitrogen inlet pipeline 11 and the nitrogen outlet pipeline 12 are communicated with the active coke regeneration area 2; the active coke adsorption zone 1 is used for introducing flue gas and ammonia gas in a corresponding proportion from a flue gas inlet pipeline 9, and the active coke 6 is used for reacting and adsorbing nitrogen oxides in the flue gas; and introducing high-temperature nitrogen with the temperature of more than 300 ℃ into the active coke regeneration zone 2, and regenerating the saturated active coke 6 which is adsorbed with NOx and enters the active coke regeneration zone 2 in a rotating manner by the high-temperature nitrogen.
The working flow of the embodiment is as follows: introducing flue gas mixed with ammonia gas into the active coke adsorption zone 1, wherein the ratio of the ammonia gas to nitrogen gas in the flue gas is 1.05:1, introducing the flue gas into the active coke adsorption zone 1 from a flue gas inlet pipeline 9, reacting with active coke 6 to adsorb NOx, and allowing the purified flue gas to flow out from a flue gas outlet pipeline 10; high-temperature nitrogen gas with the temperature of 300 ℃ enters the active coke regeneration zone 2 from the nitrogen gas inlet pipeline 11, the saturated active coke 6 is heated and regenerated by the high-temperature nitrogen gas, the adsorption capacity of the regenerated active coke 6 is recovered, and the lowest temperature of the nitrogen gas is 300 ℃ because the regeneration temperature range of the active coke 6 is 300-450 ℃. Wherein the adsorption temperature range of the active coke 6 is 200-250 ℃, so the temperature of the flue gas entering the active coke adsorption zone 1 is 200-250 ℃. The rotating shaft 4 is driven by the driving device to continuously rotate, the rotating shaft 4 drives the central cylinder 7 to rotate, the active coke 6 alternately passes through the active coke adsorption area 1 and the active coke regeneration area 2, namely the active coke 6 is alternately contacted with the flue gas and the high-temperature nitrogen, so that adsorption and regeneration circulation are continuously carried out, and the flue gas is continuously purified.
The device organically optimizes and integrates the adsorption and active coke regeneration links related to the active coke dry denitration technology, and the central cylinder is driven to rotate through the central rotating shaft, so that the adsorption and regeneration of the active coke in the cylinder are continuously carried out in the rotating process.
The device combines the adsorption and regeneration rates of the active coke of NOx carried by the flue gas with different characteristics, and reasonably and organically adjusts the proportion of the required nitrogen, thereby ensuring the effective cooperation between the adsorption and the regeneration and ensuring that the active coke in the active coke adsorption area has continuous activity and adsorption capacity.
Through simulation calculation analysis, the adsorption effect of the device can be ensured to reach more than 95%.
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.
Claims (9)
1. Nitrogen oxide rotation processing apparatus in flue gas, its characterized in that includes: the central cylinder (7) and a rotating shaft (4) used for driving the central cylinder (7) to rotate;
the interior of the central cylinder (7) is divided into an active coke adsorption area (1), an active coke regeneration area (2) and a transition area (3) positioned between the active coke adsorption area (1) and the active coke regeneration area (2), and the transition area (3) is used for isolating the active coke adsorption area (1) and the active coke regeneration area (2);
the active coke adsorption area (1) is communicated with a flue gas inlet pipeline (9) and a flue gas outlet pipeline (10), and the active coke regeneration area (2) is communicated with a nitrogen gas inlet pipeline (11) and a nitrogen gas outlet pipeline (12).
2. The rotary processing device for nitrogen oxides in flue gas as recited in claim 1, further comprising an outer shell (8), wherein the outer shell (8) is located outside the central cylinder (7), and the flue gas inlet pipeline (9), the flue gas outlet pipeline (10), the nitrogen gas inlet pipeline (11) and the nitrogen gas outlet pipeline (12) are arranged on the outer shell.
3. The rotary flue gas nitrogen oxide treatment device according to claim 1, wherein the active coke adsorption zone (1) and the active coke regeneration zone (2) are both in the shape of a sector with 160 degrees, and the transition zone (3) is in the shape of a sector with 20 degrees.
4. The rotary processing device for nitrogen oxides in flue gas according to claim 3, wherein the activated coke adsorption zone (1) and the activated coke regeneration zone (2) are filled with activated coke (6), and the transition zone (3) is filled with heat insulation materials.
5. The rotary type treatment device for nitrogen oxides in flue gas as recited in claim 4, wherein the active coke (6) is installed in the active coke adsorption zone (1) and the active coke regeneration zone (2) in a layered honeycomb structure, and the density of the active coke (6) is 450-500 kg/m3。
6. The rotary type treatment device for nitrogen oxides in flue gas according to claim 1, wherein a partition plate (5) is arranged among the active coke adsorption zone (1), the active coke regeneration zone (2) and the transition zone (3), one end of the partition plate (5) facing to the central axis of the central cylinder (7) is fixed on the rotating shaft (4), the other end of the partition plate is fixed with the inner wall of the central cylinder (7), and sealing strips (51) are arranged at two ends of the partition plate (5).
7. The method for treating the flue gas by using the rotary type treatment device for the nitrogen oxides in the flue gas as claimed in claim 1, is characterized by comprising the following steps:
introducing flue gas mixed with ammonia gas into the active coke adsorption region (1), introducing the flue gas into the active coke adsorption region (1) from a flue gas inlet pipeline (9), reacting with active coke (6) to adsorb nitric oxide, and allowing the purified flue gas to flow out from a flue gas outlet pipeline (10);
nitrogen enters the active coke regeneration zone (2) from a nitrogen inlet pipeline (11), and the saturated active coke (6) is heated and regenerated by the nitrogen;
the rotating shaft (4) continuously drives the central cylinder (7) to rotate, and the active coke (6) is alternately contacted with the flue gas and the nitrogen gas to carry out adsorption and regeneration circulation.
8. The method according to claim 7, wherein the adsorption temperature of the activated coke (6) is in the range of 200 to 250 ℃ and the regeneration temperature of the activated coke (6) is in the range of 300 to 450 ℃.
9. A method according to claim 7, characterized in that the rotation speed of the rotating shaft (4) is 1-5 revolutions per minute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110253110.9A CN112807934A (en) | 2021-03-09 | 2021-03-09 | Rotary treatment device for nitrogen oxides in flue gas and method for treating flue gas by rotary treatment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110253110.9A CN112807934A (en) | 2021-03-09 | 2021-03-09 | Rotary treatment device for nitrogen oxides in flue gas and method for treating flue gas by rotary treatment device |
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| CN112807934A true CN112807934A (en) | 2021-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113828113A (en) * | 2021-09-02 | 2021-12-24 | 中国华能集团有限公司 | Flue gas purification system |
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2021
- 2021-03-09 CN CN202110253110.9A patent/CN112807934A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113828113A (en) * | 2021-09-02 | 2021-12-24 | 中国华能集团有限公司 | Flue gas purification system |
| WO2023029408A1 (en) * | 2021-09-02 | 2023-03-09 | 中国华能集团有限公司 | Flue gas purification system |
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