CN115318047A - Flue gas washing equipment - Google Patents
Flue gas washing equipment Download PDFInfo
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- CN115318047A CN115318047A CN202210965756.4A CN202210965756A CN115318047A CN 115318047 A CN115318047 A CN 115318047A CN 202210965756 A CN202210965756 A CN 202210965756A CN 115318047 A CN115318047 A CN 115318047A
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- washing tower
- washing
- flue gas
- tower
- diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/14—Packed scrubbers
Abstract
The invention belongs to the technical field of flue gas treatment, and particularly relates to flue gas washing equipment which comprises a washing pipe with an upward pipe orifice, wherein a nozzle is arranged in the washing pipe, a spray port of the nozzle points to the pipe orifice direction of the washing pipe, the tail end of the washing pipe is communicated with a washing tower, a flue gas outlet is formed in the top of the washing tower, the flow speed of flue gas entering the washing tower is 1-1.5 m/s, a diameter-variable part with a reduced inner diameter is arranged at the upper part of the washing tower, the minimum inner diameter of the diameter-variable part is 76-82% of the inner diameter of the washing tower, and the distance between the minimum inner diameter part of the diameter-variable part and the top end of the washing tower is 30-35% of the height of the washing tower. The flue gas flowing through the washing tower has low flowing speed, the gravity of larger liquid drops is higher than the lifting force of the larger liquid drops, the larger liquid drops are fully settled and removed at the middle-lower section of the washing tower, and the smaller liquid drops and particles collide when passing through the necking part positioned at the upper section of the washing tower to settle the larger liquid drops, so that the threshing and demisting effects of the flue gas are improved, and the operating efficiency of the system is improved.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to flue gas washing equipment.
Background
The dynamic wave process of washing fume includes the reverse contact between fume containing pollutant and absorbing liquid to form turbulent reaction area, eliminating acid gas from the fume, feeding the fume into the separating tower to separate and settle dust particles in the fume, and exhausting residual gas from the top of the separating tower. In the process of making acid by smelting flue gas and roasting pyrite, the dynamic wave washer plays the role of quenching flue gas and purifying flue gas.
Chinese patent CN111036062a discloses a flue gas purification device, which comprises a washing pipe 10 with an upward pipe orifice, a nozzle 20 is arranged in the washing pipe 10, a spraying port of the nozzle 20 points to the pipe orifice direction of the washing pipe 10, the tail end of the washing pipe 10 is communicated with a washing tower 30, a flue gas outlet 31 is arranged at the top of the washing tower 30, and a reducing part 32 is arranged on a flue gas flow path in the washing tower 30. The flue gas generates turbulent flow above the diameter reducing part 32, so that dust particles or liquid drops in the flue gas fall down after colliding at the turbulent flow part, and the particle removal rate of more than 30 mu m in the flue gas is further improved. However, in the practical application process, the flue gas discharged from the scrubber still contains a large amount of particulate matters with the particle size of less than 10 μm, and after long-term use, downstream process equipment still can be blocked, so that the maintenance frequency is increased, and the production continuity is influenced.
Disclosure of Invention
The invention aims to provide flue gas washing equipment which can improve the tiny dust removal effect without increasing system resistance.
In order to realize the purpose, the invention adopts the technical scheme that: a flue gas washing device comprises a washing pipe with an upward pipe orifice, a nozzle is arranged in the washing pipe, a spraying port of the nozzle points to the pipe orifice direction of the washing pipe, the tail end of the washing pipe is communicated with a washing tower, a flue gas outlet is formed in the top of the washing tower, the flow speed of flue gas entering the washing tower is 1-1.5 m/s, a diameter-variable portion with a reduced inner diameter is arranged on the upper portion of the washing tower, the minimum inner diameter of the diameter-variable portion is 76-82% of the inner diameter of the washing tower, and the distance between the minimum inner diameter of the diameter-variable portion and the top end of the washing tower is 30-35% of the height of the washing tower.
Compared with the prior art, the invention has the following technical effects: the flue gas flowing through the washing tower has low flowing speed, the gravity of large liquid drops is higher than the lifting force of the large liquid drops, the large liquid drops are fully settled and removed at the middle-lower segment of the washing tower, and the small liquid drops and the particles collide when passing through the necking part positioned at the upper segment of the washing tower, so that the large liquid drops are settled, the threshing defogging effect of the flue gas is improved, and the operation efficiency of a system is improved.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic diagram of a first embodiment;
FIG. 2 is a schematic view of the second embodiment;
FIG. 3 is a schematic diagram of the fifth embodiment.
In the figure: 10. a washing pipe, 20 spray nozzles, 21 accident spray nozzles, 30 washing towers, 31 smoke outlets, 32 baffle plates, 33 guide plates and 34 annular strips.
Detailed Description
The following detailed description of the embodiments of the invention refers to the accompanying drawings.
A flue gas washing device is shown in figure 1 and comprises a washing pipe 10 with an upward pipe orifice, a nozzle 20 is arranged in the washing pipe 10, a spraying port of the nozzle 20 points to the direction of the pipe orifice of the washing pipe 10, a tail end air outlet at the bottom of the washing pipe 10 is communicated with a washing tower 30, a flue gas outlet 31 is arranged at the top of the washing tower 30, and the whole inner chamber of the washing tower 30 is cylindrical. In specific implementation, flue gas enters the washing pipe 10 from the upper pipe hole, the nozzle 20 sprays washing liquid upwards, the flow direction of the flue gas is opposite to the spraying direction of the washing liquid, and the flue gas and the washing liquid generate a highly turbulent foam area in the upper area of the nozzle 20 and are fully mixed and contacted. After the flue gas is sent into the washing tower 30 along the direction of the washing pipe 10, the air velocity is reduced, and at a lower air velocity, the gravity of larger liquid drops is higher than the lifting force thereof, so that the sedimentation value is applied to the bottom of the washing tower 30. When the flue gas flowing to the upper part of the washing tower 30 passes through the diameter-variable part, the air flow speed is accelerated, so that fine mist in the flue gas is combined into larger liquid drops to be settled after collision, and thus, the removal rate of the gas mist discharged from the flue gas outlet 31 is greatly improved.
In order to ensure the sufficient sedimentation of the liquid drops and the mist in the flue gas, the flowing speed of the flue gas in the washing tower 30 is reduced by expanding the diameter and the height of the tower body of the washing tower 30, so that the flowing time of the flue gas in the washing tower 30 is prolonged. In the embodiment, the diameter of the washing tower 30 is preferably 8m to 9m, and the height-diameter ratio is 2 to 2.5, so that the flow speed of the flue gas entering the washing tower 30 is 1 to 1.5m/s, and the minimum inner diameter of the diameter-variable part is 76 to 82 percent of the inner diameter of the washing tower 30, so that the flue gas can be disturbed to make the fine mist wrapped in the flue gas collide and combine into larger drops which can be settled without affecting the discharge speed of the flue gas. In order to ensure that larger liquid drops formed after flowing through the diameter-variable part can be settled, a certain distance is formed between the diameter-variable part and the top end of the washing tower 30, the distance between the minimum part of the inner diameter of the diameter-variable part and the top end of the washing tower 30 is 30-35% of the height of the washing tower 30, and the liquid drops are prevented from being discharged from the flue gas outlet 31 along with flue gas. Thus, the removal rate of the mist flowing through the washing tower 30 can be ensured to reach more than 85 percent, and the removal rate of the fine particle mist with the particle size of less than 10 mu m can reach more than 25 percent.
When the minimum internal diameter of variable diameter portion reduces, the collision is more violent when flue gas flows through variable diameter portion, can promote the desorption rate of mist in the flue gas like this, can't subside just discharge from exhanst gas outlet 31 for preventing the great liquid droplet that becomes in the flue gas of flowing through variable diameter portion, when reducing the minimum internal diameter of variable diameter portion, need increase the interval at baffle 32 and scrubbing tower 30 top.
Example one
As shown in fig. 1, a baffle 32 is disposed at the upper part of the tower body of the washing tower 30, the baffle 32 is an annular flat plate, and the outer plate edge of the baffle 32 is connected to the inner wall of the washing tower 30.
An accident nozzle 21 is further arranged in the washing pipe 10, a liquid spraying opening of the accident nozzle 21 is arranged adjacent to a liquid spraying opening of the nozzle 20, and a spraying opening of the accident nozzle 21 points to the direction of a pipe opening of the washing pipe 10. When the nozzle 20 breaks down, the accident nozzle 21 is started to spray the cleaning solution to cool the flue gas, so that the high-temperature flue gas is prevented from damaging the nozzle 20 or the spray pipe.
The bottom of the scrubber 30 is connected to a sewage pump for discharging liquid drops or particles settled to the bottom of the scrubber 30.
Example two
As shown in fig. 2, the difference between the first embodiment and the second embodiment is that the washing tower 30 further includes a guide plate 33 having a tapered ring shape with a large upper part and a small lower part, an upper plate edge of the guide plate 33 is in contact with the inner wall of the washing tower 30, and a lower plate edge is in contact with the inner plate edge of the baffle 32. Therefore, the attitude of the overhanging end of the baffle 32 can be reliably maintained, the baffle 32 is prevented from deflecting upwards under the action of smoke or deflecting downwards under the action of gravity, meanwhile, the guide plate 33 can also guide liquid drops to flow downwards, and the phenomenon that the liquid drops are accumulated on the upper plate surface of the baffle 32 to corrode the baffle 32 and the tower wall of the washing tower 30 is avoided. Furthermore, the baffle 32 and the guide plate 33 are made of fluorine-resistant and acid-resistant corrosion-resistant materials, so that the influence on the production efficiency caused by the maintenance due to the frequent corrosion of the baffle 32 or the guide plate 33 is avoided.
The baffle 32 and the guide plate 33 in the embodiment are easy to process and have reliable structure, and when the baffle 32 and the guide plate are actually applied, the diameter of the inner plate edge of the baffle 32 is about 81 percent of the inner diameter of the washing tower 30, namely D is about 0.81D, so that the baffle 32 shields 35 percent of the overflowing section of the washing tower 30; the baffle 32 is spaced from the top of the scrub column 30 by 30% of the height of the scrub column 30, i.e., H =0.30H. The actual operation tests that the removal rate of the mist with the particle size of more than 10 mu m of the smoke discharged from the smoke outlet 31 reaches 85.4 percent, and the removal rate of the mist with the fine particles with the particle size of less than 10 mu m reaches 26.5 percent.
EXAMPLE III
The difference between the embodiment and the second embodiment is that the guide plate 33 is a cambered ring plate, and the diameter of the inner plate edge of the baffle 32 is about 79% of the inner diameter of the washing tower 30, that is, D ≈ 0.79D, so that the baffle 32 shields 37% of the flow cross section of the washing tower 30; the baffle 32 is spaced from the top of the scrub column 30 by 32% of the height of the scrub column 30, i.e., H =0.32H. The practical operation shows that the removal rate of the mist with the particle size of more than 10 mu m of the smoke discharged from the smoke outlet 31 reaches 86.1 percent, and the removal rate of the fine particle mist with the particle size of less than 10 mu m reaches 27.9 percent.
Example four
The difference between the present embodiment and the second embodiment is that the diameter of the inner plate edge of the baffle 32 is about 77% of the inner diameter of the washing tower 30, i.e. D ≈ 0.77D, so that the baffle 32 shields 40% of the flow cross section of the washing tower 30; the baffle 32 is spaced from the top of the scrub column 30 by 35% of the height of the scrub column 30, i.e., H =0.35H. The actual operation tests that the removal rate of the mist with the particle size of more than 10 mu m of the smoke discharged from the smoke outlet 31 reaches 88.3 percent, and the removal rate of the mist with the fine particles with the particle size of less than 10 mu m reaches 31.2 percent.
EXAMPLE five
The difference between this embodiment and the first embodiment is that the upper part of the tower body of the washing tower 30 is provided with a ring strip 34 with a hyperbolic-shaped cross section, and the ring strip 34 is made of a fluorine-resistant and acid-resistant material. As shown in figure 3, two ends of the ring strip 34 are connected with the inner wall of the washing tower 30, the curved vertex of the ring strip 34 is the minimum inner diameter, the inner diameter of the curved vertex of the ring strip 34 is 76% -82% of the inner diameter of the washing tower 30, and the distance between the curved vertex of the ring strip 34 and the top end of the washing tower 30 is 30% -35% of the height of the washing tower 30.
Claims (8)
1. The utility model provides a flue gas washing equipment, includes mouth of pipe washing pipe (10) up, is equipped with nozzle (20) in washing pipe (10), the directional mouth of pipe direction of washing pipe (10) of the blowout of nozzle (20), the end and the scrubbing tower (30) intercommunication of washing pipe (10), the top of scrubbing tower (30) is equipped with exhanst gas outlet (31), its characterized in that: the flow speed of the flue gas entering the washing tower (30) is 1-1.5 m/s, the upper part of the washing tower (30) is provided with a diameter-variable part with the reduced inner diameter, the minimum inner diameter of the diameter-variable part is 76-82% of the inner diameter of the washing tower (30), and the distance between the minimum inner diameter part of the diameter-variable part and the top end of the washing tower (30) is 30-35% of the height of the washing tower (30).
2. The flue gas scrubbing apparatus of claim 1, wherein: when the minimum inner diameter of the diameter-variable part is reduced, the distance between the baffle plate (32) and the top of the washing tower (30) is increased.
3. The flue gas scrubbing apparatus of claim 1, wherein: the upper part of the tower body of the washing tower (30) is provided with a baffle (32), the baffle (32) is an annular flat plate, the outer plate edge of the baffle (32) is connected with the inner wall of the washing tower (30), the diameter of the inner plate edge is 76% -82% of the inner diameter of the washing tower (30), and the distance between the baffle (32) and the top of the washing tower (30) is 30% -35% of the height of the washing tower (30).
4. The flue gas scrubbing apparatus of claim 3, wherein: the washing tower also comprises a guide plate (33) which is in a shape of a cone with a large upper part and a small lower part, the upper plate edge of the guide plate (33) is connected with the inner wall of the washing tower (30), and the lower plate edge is connected with the inner plate edge of the baffle plate (32).
5. The flue gas scrubbing apparatus of claim 1, wherein: the upper part of the tower body of the washing tower (30) is provided with a circular strip (34) with a hyperbolic-surface-shaped section, the top point inner diameter of the circular strip (34) is 76% -82% of the inner diameter of the washing tower (30), the distance between the top point of the circular strip (34) and the top part of the washing tower (30) is 30% -35% of the height of the washing tower (30), and the circular strip (34) is made of fluorine-resistant and acid-resistant corrosion-resistant materials.
6. The flue gas scrubbing apparatus of claim 1, wherein: the inner chamber of the washing tower (30) is cylindrical as a whole, the diameter of the washing tower (30) is more than or equal to 7m and less than or equal to 9m, and the height-diameter ratio of the washing tower (30) is 2-2.5.
7. The flue gas scrubbing apparatus of claim 1, wherein: an accident nozzle (21) is further arranged in the washing pipe (10), a liquid spraying opening of the accident nozzle (21) is arranged close to a liquid spraying opening of the nozzle (20), and a spraying opening of the accident nozzle (21) points to the direction of a pipe opening of the washing pipe (10).
8. The flue gas scrubbing apparatus of claim 4, wherein: the baffle plate (32) and the guide plate (33) are made of fluorine-resistant and acid-resistant corrosion-resistant materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210965756.4A CN115318047A (en) | 2022-08-12 | 2022-08-12 | Flue gas washing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210965756.4A CN115318047A (en) | 2022-08-12 | 2022-08-12 | Flue gas washing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115318047A true CN115318047A (en) | 2022-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210965756.4A Pending CN115318047A (en) | 2022-08-12 | 2022-08-12 | Flue gas washing equipment |
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| Country | Link |
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| CN (1) | CN115318047A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150128543A1 (en) * | 2013-07-25 | 2015-05-14 | Exxonmobil Research And Engineering Company | Mist eliminator configuration for droplet removal in fouling service |
| CN205570081U (en) * | 2016-03-09 | 2016-09-14 | 中国空分工程有限公司 | Two district's circulation desulfurization column equipment |
| WO2017159099A1 (en) * | 2016-03-15 | 2017-09-21 | 富士電機株式会社 | Exhaust gas processing device |
| US9770690B2 (en) * | 2012-12-19 | 2017-09-26 | Fuji Electric Co., Ltd. | Exhaust gas processing apparatus |
| CN111036062A (en) * | 2019-12-12 | 2020-04-21 | 铜陵有色金属集团股份有限公司 | Flue gas purifying device |
-
2022
- 2022-08-12 CN CN202210965756.4A patent/CN115318047A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9770690B2 (en) * | 2012-12-19 | 2017-09-26 | Fuji Electric Co., Ltd. | Exhaust gas processing apparatus |
| US20150128543A1 (en) * | 2013-07-25 | 2015-05-14 | Exxonmobil Research And Engineering Company | Mist eliminator configuration for droplet removal in fouling service |
| CN205570081U (en) * | 2016-03-09 | 2016-09-14 | 中国空分工程有限公司 | Two district's circulation desulfurization column equipment |
| WO2017159099A1 (en) * | 2016-03-15 | 2017-09-21 | 富士電機株式会社 | Exhaust gas processing device |
| CN111036062A (en) * | 2019-12-12 | 2020-04-21 | 铜陵有色金属集团股份有限公司 | Flue gas purifying device |
Non-Patent Citations (1)
| Title |
|---|
| 齐立强: "燃煤烟气现代除尘与测试技术", vol. 1, 冶金工业出版社, pages: 192 - 195 * |
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