CN107875819B - Wet flue gas desulfurization tower - Google Patents
Wet flue gas desulfurization tower Download PDFInfo
- Publication number
- CN107875819B CN107875819B CN201711351258.6A CN201711351258A CN107875819B CN 107875819 B CN107875819 B CN 107875819B CN 201711351258 A CN201711351258 A CN 201711351258A CN 107875819 B CN107875819 B CN 107875819B
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- China
- Prior art keywords
- cylinder
- stage
- spraying
- stage spray
- flue gas
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- 239000003546 flue gas Substances 0.000 title claims abstract description 62
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 40
- 230000023556 desulfurization Effects 0.000 title claims abstract description 40
- 239000007921 spray Substances 0.000 claims abstract description 100
- 238000005507 spraying Methods 0.000 claims abstract description 85
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 238000005192 partition Methods 0.000 claims abstract description 18
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 8
- 229910052815 sulfur oxide Inorganic materials 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
Classifications
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- 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
Abstract
A wet flue gas desulfurization tower comprises a tower body, wherein a spray layer in the tower body comprises a baffle plate, a first-stage spray cylinder, a second-stage spray cylinder and a third-stage spray cylinder; the partition board is connected with the inner wall of the tower body, the top of the first-stage spraying cylinder penetrates through the partition board and extends to the upper part of the partition board, the top of the second-stage spraying cylinder extends to the upper part of the top of the first-stage spraying cylinder, the top of the third-stage spraying cylinder extends to the upper part of the top of the second-stage spraying cylinder, and the bottoms of the first-stage spraying cylinder and the second-stage spraying cylinder are all opened, so that a first-stage spraying cavity is formed among the outer wall of the first-stage spraying cylinder, the partition board and the inner wall of the tower body, a second-stage spraying cavity is formed between the inner wall of the first-stage spraying cylinder and the outer wall of the second-stage spraying cylinder, and a third-stage spraying cavity is formed between the inner wall of the second-stage spraying cylinder and the outer wall of the third-stage spraying cylinder; the upper parts of the first-stage spray cavity, the second-stage spray cavity and the third-stage spray cavity are respectively provided with a first vent hole, a second vent hole and a third vent hole, and the top of the third-stage spray cylinder is provided with an air outlet. The flue gas is uniformly distributed in the tower body, the slurry is fully contacted with the flue gas, and the desulfurization effect is good.
Description
Technical Field
The invention belongs to the technical field of desulfurization dust removal equipment, and particularly relates to a wet flue gas desulfurization tower.
Background
Flue gas desulfurization refers to the removal of Sulfur Oxides (SO) from flue gas or other industrial waste gases 2 And SO 3 ) SO in flue gas 2 Essentially an acidRemoving SO from flue gas by reaction with suitable alkaline substances 2 . The most common alkaline material for flue gas desulfurization is limestone (calcium carbonate, caCO) 3 ) Quicklime (calcium oxide, caO) and slaked lime (calcium hydroxide, ca (OH) 2 ). Limestone is produced in high yield and is therefore relatively inexpensive, and both quicklime and slaked lime are produced from limestone by heating. In wet flue gas desulfurization systems, alkaline material (typically an alkaline solution, more typically a slurry of the alkali) is encountered with the flue gas in a spray tower. SO in flue gas 2 Dissolved in water to form a dilute acid solution, and then subjected to neutralization reaction with an alkaline substance dissolved in water. The sulfite and sulfate salts formed by the reaction precipitate from the aqueous solution, depending on the relative solubilities of the different salts present in the solution.
The existing wet flue gas desulfurization tower generally comprises a slurry pond, a spraying layer and a demister, wherein the spraying layer is simple in structure, uneven in flue gas distribution, poor in desulfurization effect, capable of enabling slurry to be in insufficient contact with the flue gas, and capable of only performing primary desulfurization on the flue gas and the slurry, and if multiple desulfurization is required, the spraying layer can be added, so that the height of the desulfurization tower is increased, and the production cost is increased.
Disclosure of Invention
The invention aims at: aiming at the problem of poor desulfurization effect caused by uneven flue gas distribution in the spraying desulfurization of the existing wet flue gas desulfurization tower, the invention provides the wet flue gas desulfurization tower.
The technical scheme adopted by the invention is as follows:
the wet flue gas desulfurization tower comprises a tower body, wherein a slurry pool, a spray layer and a demister are sequentially arranged in the tower body from bottom to top, a flue gas inlet is formed in the lower part of the tower body, a flue gas outlet is formed in the top of the tower body, and the spray layer comprises a partition plate, a first-stage spray cylinder, a second-stage spray cylinder arranged in the first-stage spray cylinder and a third-stage spray cylinder arranged in the second-stage spray cylinder; the top of the first-stage spray cylinder penetrates through the partition plate and extends to the upper part of the partition plate, the top of the second-stage spray cylinder penetrates through the top of the first-stage spray cylinder and extends to the upper part of the top of the first-stage spray cylinder, the top of the third-stage spray cylinder penetrates through the top of the second-stage spray cylinder and extends to the upper part of the top of the second-stage spray cylinder, and the bottoms of the first-stage spray cylinder and the second-stage spray cylinder are both opened, so that a first-stage spray cavity is formed among the outer wall of the first-stage spray cylinder, the partition plate and the inner wall of the tower body, a second-stage spray cavity is formed among the inner wall of the first-stage spray cylinder and the outer wall of the second-stage spray cylinder, and a third-stage spray cavity is formed among the inner wall of the second-stage spray cylinder and the outer wall of the third-stage spray cylinder; the upper part of the primary spraying cavity is provided with a first vent hole communicated with the secondary spraying cavity, the upper part of the secondary spraying cavity is provided with a second vent hole communicated with the tertiary spraying cavity, the upper part of the tertiary spraying cavity is provided with a third vent hole communicated with the tertiary spraying cylinder, and the top of the tertiary spraying cylinder is provided with an air outlet; the upper parts of the primary spraying cavity, the secondary spraying cavity and the tertiary spraying cavity are respectively provided with an annular spray pipe connected with the slurry pool, and the annular spray pipes are provided with evenly distributed spray nozzles.
When the desulfurization tower works, flue gas to be desulfurized enters the tower body from the flue gas inlet, then is divided into three parts under the action of the first-stage spray cylinder, the second-stage spray cylinder and the third-stage spray cylinder, flue gas close to the inner wall of the tower body enters the first-stage spray cavity, flue gas positioned in the middle of the tower body enters the third-stage spray cavity, the rest flue gas enters the second-stage spray cavity, then slurry is introduced into the annular spray pipe through the slurry pond, and spray desulfurization is carried out through uniformly distributed nozzles, so that the flue gas entering the tower body can realize batch desulfurization, the flue gas is uniformly distributed in the tower body, full contact between the slurry and the flue gas is facilitated, and the desulfurization effect is good. Flue gas in the first-stage spraying cavity enters the second-stage spraying cavity through the first vent hole and is subjected to secondary desulfurization in the second-stage spraying cavity, similarly, flue gas in the second-stage spraying cavity enters the third-stage spraying cavity through the second vent hole to continuously perform desulfurization, flue gas in the third-stage spraying cavity enters the third-stage spraying cylinder through the third vent hole, and then is discharged from the air outlet to be defogged, and finally is discharged from the flue gas outlet, so that sprayed slurry re-enters the slurry pond.
Further, the slurry pool is connected with an oxidation fan. The oxidation blower provides oxygen for the slurry pool to react, so that the sulfite forms stable sulfate and is crystallized.
Further, a stirrer is arranged in the slurry pool. The stirrer prevents precipitation of the slurry pool and enhances the oxidation effect.
Further, the slurry pond pumps the slurry to the spray level via a circulation pump.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. according to the invention, the primary spraying cylinder, the secondary spraying cylinder and the tertiary spraying cylinder are arranged, so that the flue gas is uniformly distributed in the tower body, batch desulfurization is realized through the annular spray pipe, and the slurry is fully contacted with the flue gas, so that the desulfurization effect is good;
2. the flue gas in the first-stage spray cavity passes through the second-stage spray cavity and the third-stage spray cavity before entering the third-stage spray cylinder, so that three desulfurization is realized, the desulfurization is thorough, and similarly, the flue gas in the second-stage spray cavity can realize two desulfurization;
drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic view of the spray layer structure of the present invention.
The marks in the figure: the device comprises a 1-tower body, a 2-demister, a 3-air outlet, a 4-secondary spray cylinder, a 5-primary spray cylinder, a 6-circulating pump, a 7-oxidation fan, an 8-tertiary spray cylinder, a 9-slurry pool, a 10-stirrer, an 11-flue gas inlet, a 12-first vent hole, a 13-nozzle, a 14-annular spray pipe, a 15-partition plate, a 16-second vent hole, a 17-third vent hole and an 18-flue gas outlet.
Detailed Description
All of the features disclosed in this specification, except for mutually exclusive features and/or steps, may be combined in any manner.
The present invention will be described in detail with reference to fig. 1 and 2.
Example 1
The wet flue gas desulfurization tower comprises a tower body 1, wherein a slurry pool 9, a spray layer and a demister 2 are sequentially arranged in the tower body 1 from bottom to top, a flue gas inlet 11 is arranged at the lower part of the tower body 1, a flue gas outlet 18 is arranged at the top of the tower body 1, and the spray layer comprises a partition plate 15, a primary spray cylinder 5, a secondary spray cylinder 4 arranged in the primary spray cylinder 5 and a tertiary spray cylinder 8 arranged in the secondary spray cylinder 4; the partition plate 15 is in sealing connection with the inner wall of the tower body 1, the top of the first-stage spray cylinder 5 passes through the partition plate 15 and extends to the upper part of the partition plate 15, the top of the second-stage spray cylinder 4 passes through the top of the first-stage spray cylinder 5 and extends to the upper part of the top of the first-stage spray cylinder 5, the top of the third-stage spray cylinder 8 passes through the top of the second-stage spray cylinder 4 and extends to the upper part of the top of the second-stage spray cylinder 4, and the bottoms of the first-stage spray cylinder 5 and the second-stage spray cylinder 4 are both opened, so that a first-stage spray cavity is formed among the outer wall of the first-stage spray cylinder 5, the partition plate 15 and the inner wall of the tower body 1, a second-stage spray cavity is formed among the inner wall of the first-stage spray cylinder 5 and the outer wall of the second-stage spray cylinder 4, and a third-stage spray cavity is formed among the inner wall of the second-stage spray cylinder 4 and the outer wall of the third-stage spray cylinder 8; the upper part of the primary spraying cavity is provided with a first vent hole 12 communicated with the secondary spraying cavity, the upper part of the secondary spraying cavity is provided with a second vent hole 16 communicated with the tertiary spraying cavity, the upper part of the tertiary spraying cavity is provided with a third vent hole 17 communicated with the tertiary spraying cylinder 8, and the top of the tertiary spraying cylinder 8 is provided with an air outlet 3; the upper parts of the primary spraying cavity, the secondary spraying cavity and the tertiary spraying cavity are respectively provided with an annular spraying pipe 14 connected with the slurry pool 9, and the annular spraying pipes 14 are provided with evenly distributed nozzles 13.
When the desulfurization tower provided by the invention works, flue gas to be desulfurized enters the tower body 1 from the flue gas inlet 11, is then divided into three parts under the action of the primary spraying cylinder 5, the secondary spraying cylinder 4 and the tertiary spraying cylinder 8, flue gas close to the inner wall of the tower body 1 enters the primary spraying cavity, flue gas in the middle position of the tower body 1 enters the tertiary spraying cavity, the rest flue gas enters the secondary spraying cavity, then slurry pond 9 is filled with slurry into the annular spray pipe 14, and spray desulfurization is carried out through uniformly distributed nozzles 13, so that the flue gas entering the tower body 1 can realize batch desulfurization, the flue gas is uniformly distributed in the tower body 1, full contact between the slurry and the flue gas is facilitated, and the desulfurization effect is good. Flue gas in the first-stage spraying cavity enters the second-stage spraying cavity through the first vent hole 12 and is subjected to secondary desulfurization in the second-stage spraying cavity, and similarly, flue gas in the second-stage spraying cavity enters the third-stage spraying cavity through the second vent hole 16 to continuously perform desulfurization, flue gas in the third-stage spraying cavity enters the third-stage spraying cylinder 8 through the third vent hole 17, is discharged from the air outlet 3 and is defogged, and finally is discharged from the flue gas outlet 18, and the slurry after spraying enters the slurry pond 9 again.
Example 2
Based on embodiment 1, an oxidation blower 7 is connected to the slurry tank 9. The oxidation blower 7 supplies oxygen to the slurry tank 9 for reaction, so that the sulfite forms stable sulfate and is crystallized.
Example 3
Based on examples 1 and 2, a stirrer 10 is provided in the slurry tank 9. The agitator 10 prevents precipitation of the slurry pool 9 and enhances the oxidation effect.
Example 4
Based on examples 1 and 2, the slurry tank 9 pumps the slurry to the spray level by the circulation pump 6.
The above-described embodiments of the present invention. The present invention is not limited to the above embodiments, and any person who can learn about the structural changes made under the teaching of the present invention falls within the scope of protection of the present invention if the present invention has the same or similar technical solutions.
Claims (2)
1. The wet flue gas desulfurization tower comprises a tower body (1), wherein a slurry pool (9), a spraying layer and a demister (2) are sequentially arranged in the tower body (1) from bottom to top, a flue gas inlet (11) is formed in the lower part of the tower body (1), and a flue gas outlet (18) is formed in the top of the tower body (1), and the wet flue gas desulfurization tower is characterized in that the spraying layer comprises a partition plate (15), a primary spraying cylinder (5), a secondary spraying cylinder (4) arranged in the primary spraying cylinder (5) and a tertiary spraying cylinder (8) arranged in the secondary spraying cylinder (4);
the top of the first-stage spray cylinder (5) penetrates through the partition plate (15) and extends to the upper part of the partition plate (15), the top of the second-stage spray cylinder (4) penetrates through the top of the first-stage spray cylinder (5) and extends to the upper part of the top of the first-stage spray cylinder (5), the top of the third-stage spray cylinder (8) penetrates through the top of the second-stage spray cylinder (4) and extends to the upper part of the top of the second-stage spray cylinder (4), the bottoms of the first-stage spray cylinder (5) and the second-stage spray cylinder (4) are all open, so that a first-stage spray cavity is formed among the outer wall of the first-stage spray cylinder (5), the partition plate (15) and the inner wall of the tower (1), a second-stage spray cavity is formed among the inner wall of the first-stage spray cylinder (5) and the outer wall of the second-stage spray cylinder (4), and a third-stage spray cavity is formed among the inner wall of the second-stage spray cylinder (4) and the outer wall of the third-stage spray cylinder (8);
the upper part of the primary spraying cavity is provided with a first vent hole (12) communicated with the secondary spraying cavity, the upper part of the secondary spraying cavity is provided with a second vent hole (16) communicated with the tertiary spraying cavity, the upper part of the tertiary spraying cavity is provided with a third vent hole (17) communicated with the tertiary spraying cylinder (8), and the top of the tertiary spraying cylinder (8) is provided with an air outlet (3);
the upper parts of the primary spraying cavity, the secondary spraying cavity and the tertiary spraying cavity are respectively provided with an annular spraying pipe (14) connected with the slurry pool (9), and the annular spraying pipes (14) are provided with evenly distributed nozzles (13);
a stirrer (10) is arranged in the slurry pool (9);
the slurry pool (9) pumps the slurry to the spraying layer through the circulating pump (6).
2. Wet flue gas desulfurization tower according to claim 1, characterized in that the slurry tank (9) is connected with an oxidation fan (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711351258.6A CN107875819B (en) | 2017-12-15 | 2017-12-15 | Wet flue gas desulfurization tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711351258.6A CN107875819B (en) | 2017-12-15 | 2017-12-15 | Wet flue gas desulfurization tower |
Publications (2)
| Publication Number | Publication Date |
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| CN107875819A CN107875819A (en) | 2018-04-06 |
| CN107875819B true CN107875819B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711351258.6A Active CN107875819B (en) | 2017-12-15 | 2017-12-15 | Wet flue gas desulfurization tower |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012038A (en) * | 2018-08-10 | 2018-12-18 | 杨明超 | A kind of equipment for treating industrial waste gas |
| CN112275114A (en) * | 2020-09-09 | 2021-01-29 | 程学芳 | Two-stage wet desulphurization tower |
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