CN220276673U - Three-circulation U-shaped composite desulfurizing tower - Google Patents
Three-circulation U-shaped composite desulfurizing tower Download PDFInfo
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- CN220276673U CN220276673U CN202321504847.4U CN202321504847U CN220276673U CN 220276673 U CN220276673 U CN 220276673U CN 202321504847 U CN202321504847 U CN 202321504847U CN 220276673 U CN220276673 U CN 220276673U
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- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 23
- 239000002002 slurry Substances 0.000 claims abstract description 102
- 239000007788 liquid Substances 0.000 claims abstract description 64
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003546 flue gas Substances 0.000 claims abstract description 28
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 claims abstract description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 33
- 230000023556 desulfurization Effects 0.000 claims description 33
- 239000010440 gypsum Substances 0.000 claims description 23
- 229910052602 gypsum Inorganic materials 0.000 claims description 23
- 235000019738 Limestone Nutrition 0.000 claims description 20
- 239000006028 limestone Substances 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000003595 mist Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 abstract description 46
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011593 sulfur Substances 0.000 abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 abstract description 6
- 239000012717 electrostatic precipitator Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 14
- 230000001502 supplementing effect Effects 0.000 description 7
- 230000002745 absorbent Effects 0.000 description 6
- 239000002250 absorbent Substances 0.000 description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 6
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 4
- 235000010261 calcium sulphite Nutrition 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000006260 foam Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000012719 wet electrostatic precipitator Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model relates to a three-cycle U-shaped composite desulfurizing tower, which comprises a primary tower with a flue gas inlet at the upper part and a secondary tower with a flue gas outlet at the upper part, wherein the primary tower and the secondary tower are connected into a U-shaped tower body, a slurry tank is arranged at the lower part of the tower body, and a flue gas channel for communicating the primary tower and the secondary tower is arranged above the slurry tank; the second-stage tower is a countercurrent composite tower, and an absorption area of the countercurrent composite tower comprises a tray, a plurality of layers of second-stage tower spraying layers, a liquid-holding layer and a horizontal flue demisting section from bottom to top, wherein the liquid-holding layer comprises a liquid collector, an S-shaped gas-liquid mass transfer mechanism and a liquid distributor which are sequentially arranged from bottom to top, and an outlet of the liquid collector and an inlet of the liquid distributor are connected through a liquid-holding layer slurry circulating pump and a circulating pipe, so that the liquid-holding layer is an independent circulating system. The utility model realizes ultra-low emission of sulfur dioxide and dust in ultra-high sulfur coal-fired flue gas through three-circulation and composite tower internals, and does not need to be provided with an electrostatic precipitator.
Description
Technical Field
The utility model relates to the technical field of waste gas treatment, in particular to a desulfurizing tower for ultralow emission treatment of flue gas.
Background
In order to achieve standard emission or ultralow emission indexes of medium-high sulfur coal-fired flue gas, a double-circulation process is mainly adopted at present.
Chinese patent CN 203725009U discloses a single-tower double-circulation desulfurization system, in which a front circulation desulfurization zone and a rear circulation desulfurization zone which are independent of each other are arranged at the upper part of a desulfurization tower, so that a relatively independent double-circulation system is realized in one tower, and the desulfurization efficiency can reach more than 99%. Chinese patent CN210699539U discloses a single side is equipped with the desulfurizing tower that turns back of tray, and the middle part in desulfurization district is equipped with vertical flue gas baffle and divides the desulfurization district into the downstream side desulfurization district and the countercurrent side desulfurization district of controlling the interval, sprays through two sections in the tower that turns back and wash and absorb, has very high desulfurization dust removal efficiency.
The technology improves the removal efficiency of sulfur dioxide and dust through double circulation, can realize ultralow emission of medium-high sulfur coal-fired flue gas, but aims at the following problems in ultrahigh sulfur coal-fired flue gas purification:
1) Due to the ultrahigh content of the sulfur in the inlet, the conventional double-circulation 99% and even 99.5% removal efficiency still cannot meet the standard emission requirements of the outlet, and cannot meet the ultralow or ultralow emission requirements of sulfur dioxide.
2) Each double-circulation tower is still a conventional spray tower, the dust removal efficiency is not changed substantially compared with that of a single-circulation tower, a wet electrostatic precipitator is arranged at the outlet of the absorption tower to realize ultra-low dust emission, the occupied area is large, and the investment and the operation cost are high.
3) If three towers and three circulation are adopted, the occupied area is larger, the system is complex, the investment and the operation cost are high, and the wet electrostatic precipitator is still required to be arranged at the outlet of the absorption tower for realizing the ultra-low emission of dust by the spray tower, so that the practical project is difficult to implement.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides the three-cycle U-shaped composite desulfurizing tower, which realizes ultra-low emission of sulfur dioxide and dust in ultra-high sulfur coal flue gas through three-cycle and composite tower internals, and does not need to be provided with an electrostatic precipitator.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the three-cycle U-shaped composite desulfurizing tower comprises a primary tower with a flue gas inlet at the upper part and a secondary tower with a flue gas outlet at the upper part, wherein the primary tower and the secondary tower are connected into a U-shaped tower body, a slurry tank is arranged at the lower part of the tower body, and a flue gas channel for communicating the primary tower and the secondary tower is arranged above the slurry tank; the secondary tower is a countercurrent composite tower, an absorption area of the secondary tower comprises a tray, a plurality of layers of secondary tower spraying layers, a liquid holding layer and a horizontal flue demisting section from bottom to top, wherein the liquid holding layer comprises a liquid collector, an S-shaped gas-liquid mass transfer mechanism and a liquid distributor which are sequentially arranged from bottom to top, and an outlet of the liquid collector and an inlet of the liquid distributor are connected through a liquid holding layer slurry circulating pump and a circulating pipe, so that the liquid holding layer is an independent circulating system.
In the scheme, the device further comprises a primary tower slurry circulating pump and a secondary tower slurry circulating pump, wherein the primary tower spraying layer is connected with the slurry tank through the primary tower slurry circulating pump and the slurry circulating pipe, and the secondary tower spraying layer is connected with the slurry tank through the secondary tower slurry circulating pump and the slurry circulating pipe.
In the scheme, a branch pipeline is arranged at the outlet of the liquid collector and is connected with the desulfurizing agent supplementing inlet of the slurry circulating pump of the secondary tower.
In the scheme, limestone gypsum slurry is filled in the slurry tank, and the pH value of the limestone gypsum slurry is 5.2-5.8.
In the scheme, the liquid-holding layer circulating slurry is limestone gypsum slurry, and the pH value of the limestone gypsum slurry is 5.8-6.4.
In the above scheme, the liquid-holding layer slurry circulating pump is provided with an inlet desulfurizing agent supplementing inlet for supplementing the limestone-gypsum slurry.
In the above scheme, the second-stage tower further comprises a tower inner defogging layer, wherein the tower inner defogging layer comprises a liquid-holding layer lower portion defogger arranged below the liquid-holding layer and a liquid-holding layer upper portion defogger arranged above the liquid-holding layer.
In the scheme, the horizontal flue demister section is provided with a two-stage or three-stage efficient flue demister.
In the scheme, a plurality of oxidized air pipes are arranged in the slurry tank; the slurry tank is also provided with a jacking stirrer or a plurality of side-entering stirrers.
In the scheme, the cross section of the slurry pool at the lower part of the tower body is rectangular, and the cross sections of the primary tower and the secondary tower are rectangular or square.
The utility model has the beneficial effects that:
1. the utility model divides the desulfurization tower into three independent circulation areas by utilizing a first-stage tower, a second-stage tower and a liquid-holding layer, wherein the lower areas of the first-stage tower and the second-stage tower adopt low pH limestone gypsum slurry as absorbent, and coarse desulfurization and dust removal are carried out by utilizing a spraying layer of the first-stage tower, and fine desulfurization and dust removal are carried out by utilizing a tray of the second-stage tower and the spraying layer; the upper region of the secondary tower adopts limestone gypsum slurry with high pH value as an absorbent, and the high-efficiency mass transfer function of the liquid-holding layer is utilized to perform ultra-fine desulfurization and dust removal. The utility model realizes the three-stage desulfurization and dust removal of the flue gas by the three stages of the primary tower spraying, the secondary tower tray spraying and the liquid-holding layer, and further improves the desulfurization and dust removal efficiency compared with the conventional double-tower double-cycle process.
2. The liquid-holding layer has high-efficiency desulfurization function. The limestone slurry with higher pH value is distributed to the S-shaped gas-liquid mass transfer mechanism through the liquid-holding layer liquid distributor, the slurry flows to the liquid-holding layer liquid collector along the parallel direction of the strip-shaped channel of the S-shaped gas-liquid mass transfer mechanism, and then flows out of the tower through the pipeline to form a circulation, so that the slurry forms a layer of limestone slurry liquid film on the S-shaped gas-liquid mass transfer mechanism. The flue gas is fully mixed with the slurry through the S-shaped gas-liquid mass transfer machine to form a foam state or a stable injection state and react with the slurry, so that the mass transfer area is large and the mass transfer effect is good. The gas and the liquid are fully contacted under the condition of high pH value, the desulfurization efficiency is obviously improved, the desulfurization efficiency can reach more than 99.8 percent, and the ultra-low emission is realized.
3. The liquid-holding layer has high-efficiency dust removing function. The upper part of the S-shaped gas-liquid mass transfer mechanism forms a fully covered liquid film, when gas passes through the liquid film, a large amount of bubbles are excited, the gas-liquid contact area is increased, and dust is continuously disturbed by foam while the inertia and diffusion effects are achieved, so that the dust is continuously changed in direction, the contact opportunity of the dust and the liquid is increased, and the dust is further removed. Because the dust removal of the device comprises the trapping effect of bubbles and liquid films on dust, the dust removal effect is higher than the dust removal efficiency of spraying, and especially the performance of removing PM2.5 and smaller fine dust is very high and far higher than the dust removal efficiency of spraying washing. Meanwhile, the device does not have the effect of spraying a large amount of fine particle fog drops sprayed by the spray tower nozzle by utilizing pressure, reduces the load of the fog drops at the inlet of the demister, is also good for improving the demisting effect of the subsequent demister, and reduces the contribution of suspended gypsum in the fog drops to dust along with the reduction of the fog drop concentration.
4. The tray and the S-shaped gas-liquid mass transfer mechanism are simultaneously used as a gas-liquid reinforced mass transfer device, so that the contact opportunity of dust in the flue gas and slurry is increased. Because the dust removal of tray and S type gas-liquid mass transfer mechanism includes the entrapment effect of bubble, liquid film to the dust, its dust removal effect is higher than the dust removal efficiency who sprays, and especially the performance of desorption PM2.5 and following tiny dust is very high, is far higher than the dust removal efficiency who sprays the washing. Meanwhile, the non-uniform opening arrangement of the tray plays a role in uniformly distributing air flow, and is also good in helping to improve the effect of the spraying layer. Therefore, the overall dust removal efficiency of the device can reach 90%, and ultra-low emission of dust can be stably realized under the condition of not setting wet electric dust removal.
5. The primary tower and the secondary tower adopt U-shaped tower designs, and the secondary tower adopts a composite tower form, so that the structure is compact, the occupied area is reduced, and the investment cost is saved.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view showing the structure of a three-cycle U-shaped composite desulfurizing tower according to a first embodiment of the present utility model;
fig. 2 is a schematic structural view of a three-cycle U-shaped composite desulfurizing tower according to a second embodiment of the present utility model.
In the figure: 1. a flue gas inlet; 2. a first-stage tower spray layer; 3. a slurry tank; 4. an oxidation air tube; 5. a slurry outlet of the slurry tank; 6. a stirrer; 7. a primary tower slurry circulation pump; 8. a tray; 9. spraying a layer by a secondary tower; 10. a demister at the lower part of the liquid-holding layer; 11. a liquid collector; 12. s-shaped gas-liquid mass transfer mechanism; 13. a liquid distributor; 14. a demister on the upper part of the liquid-holding layer; 15. a flue demister; 16. a flue gas outlet; 17. a liquid-holding layer slurry circulation pump; 18. a desulfurizing agent supplementing inlet; 19. and a secondary tower slurry circulating pump.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.
As shown in fig. 1, a three-cycle U-shaped composite desulfurizing tower according to a first embodiment of the present utility model includes a primary tower having a flue gas inlet 1 at an upper portion thereof and a secondary tower having a flue gas outlet 16 at an upper portion thereof, the primary tower and the secondary tower being connected to form a U-shaped tower body, a slurry tank 3 being provided at a lower portion thereof, and a flue gas passage communicating the primary tower and the secondary tower being provided above the slurry tank 3. The primary tower is a concurrent spray tower and is provided with a plurality of layers of primary tower spray layers 2, and the inlet of the primary tower spray layer 2 is connected with the slurry pond 3 through a primary tower slurry circulating pump 7 and a slurry circulating pipe to form a first independent circulating system. The secondary tower is a countercurrent composite tower, and the absorption zone of the countercurrent composite tower comprises a tray 8, a plurality of layers of secondary tower spray layers 9, a liquid holding layer and a horizontal flue demisting section from bottom to top, wherein the inlet of the secondary tower spray layer 9 is connected with the slurry tank 3 through a secondary tower slurry circulating pump 19 and a slurry circulating pipe to form a second independent circulating system; the liquid-holding layer comprises a liquid collector 11, an S-shaped gas-liquid mass transfer mechanism 12 and a liquid distributor 13 which are sequentially arranged from bottom to top, and the outlet of the liquid collector 11 is connected with the inlet of the liquid distributor 13 through a liquid-holding layer slurry circulating pump 17 and a circulating pipe, so that the liquid-holding layer forms a third independent circulating system.
The desulfurization tower is divided into three independent circulation areas by utilizing a primary tower, a secondary tower and a liquid-holding layer, wherein limestone gypsum slurry with low pH value is adopted as an absorbent in the lower areas of the primary tower and the secondary tower, coarse desulfurization and dust removal are carried out by utilizing a primary tower spray layer 2, and fine desulfurization and dust removal are carried out by utilizing a secondary tower tray 8 and a secondary tower spray layer 9; the upper region of the secondary tower adopts limestone gypsum slurry with high pH value as an absorbent, and the high-efficiency mass transfer function of the liquid-holding layer is utilized to perform ultra-fine desulfurization and dust removal. The utility model realizes three-stage desulfurization and dust removal of the flue gas through the three stages of the primary tower spraying, the secondary tower tray 8, the spraying and the liquid-holding layer, and further improves the desulfurization and dust removal efficiency compared with the conventional double-tower double-cycle process.
Further optimizing, the limestone gypsum slurry is filled in the slurry tank 3, and the pH value of the limestone gypsum slurry is 5.2-5.8.
Further optimized, the liquid-holding layer circulating slurry is limestone gypsum slurry, and the pH value of the limestone gypsum slurry is 5.8-6.4.
Further preferably, the inlet of the liquid-holding slurry circulating pump 17 is provided with a desulfurizing agent supplementing inlet 18 for supplementing limestone-gypsum slurry.
Further preferably, the outlet of the liquid collector 11 is provided with a branch pipe connected with the desulfurizing agent supplementing inlet of the slurry circulating pump 19 of the secondary tower. The pH of the slurry at the outlet of the liquid collector 11 is lower than that of the original desulfurization supplement agent, but higher than that of the slurry in the slurry tank, so that the purpose of the arrangement is to increase the pH of the circulating slurry of the slurry circulating pump 19 of the secondary tower (higher than that of the circulating slurry tank directly) to form pH gradient utilization, thereby improving desulfurization efficiency.
Further preferably, the secondary tower further comprises an in-tower demisting layer comprising a liquid-holding layer lower demister 10 disposed below the liquid-holding layer and a liquid-holding layer upper demister 14 disposed above the liquid-holding layer. The lower mist eliminator 10 of the liquid-holding layer functions as: mist drops sprayed by the spray nozzles of the spray layer 9 of the secondary tower are prevented from being brought into the liquid-holding layer, so that the concentration of the liquid-holding layer slurry is high, and unnecessary deposition and blockage are caused. The upper mist eliminator 14 of the liquid holding layer functions as: prevent that the thick liquid from being stained with and attaching to the top of the tower and leading to the scale deposit, reduce follow-up flue defroster 15 load, defroster sparge water plays the effect of washing liquid-holding layer and diluting liquid-holding layer thick liquid simultaneously.
Further optimized, the horizontal flue demisting section is provided with a two-stage or three-stage efficient flue demister 15.
Further optimizing, a plurality of oxidized air pipes 4 are arranged in the slurry tank 3. The limestone slurry absorbs sulfur dioxide to generate calcium sulfite, the calcium sulfite is unstable and can be decomposed into sulfur dioxide again, and the calcium sulfite is easy to scale. The calcium sulfite in the slurry is oxidized into calcium sulfate by oxidizing air, the calcium sulfate is a chemically stable product, the hydrate of the calcium sulfate is gypsum, and the gypsum can be sold as a byproduct after the slurry is dehydrated.
Further preferably, a plurality of side-entering stirrers 6 are also arranged in the slurry tank 3. In other embodiments, a jacking agitator 6 may be provided in the vat 3, as shown in fig. 2.
Further preferably, the vat 3 is provided with a vat discharge opening 5 through which the slurry is discharged by a slurry discharge pump.
Further optimizing, for the convenience of manufacturing, tower body lower part thick liquid pond 3 cross section is rectangle, and primary tower and secondary tower cross section are rectangle or square.
Further optimized, the spraying layer 2 of the primary tower and the spraying layer 9 of the secondary tower are 3 layers, and the spray nozzles on the spraying layers are double-head atomizing spray nozzles.
Further preferably, the tray 8 employs a non-uniform aperture arrangement.
Further optimizing, the height of the limestone slurry on the S-shaped gas-liquid mass transfer mechanism 12 is 20-100 mm.
In the embodiment, the S-shaped gas-liquid mass transfer mechanism 12 is utilized to divide the absorption region of the secondary tower into an upper region and a lower region, and the lower region adopts conventional limestone gypsum slurry as an absorbent to primarily remove sulfur dioxide in the flue gas; the upper region adopts high pH limestone slurry as an absorbent to carry out fine removal on flue gas. Compared with the conventional double-tower double-circulation process, the desulfurization efficiency is further improved, the overall efficiency of the desulfurization tower is up to 99.95%, the removal efficiency of the first-stage tower is not lower than 75%, the removal efficiency of the second-stage tower is not lower than 99.8%, the emission concentration of sulfur dioxide at the outlet of the absorption tower is lower than 10mg/Nm < 3 >, and ultra-low emission is realized.
The tray 8 and the S-shaped gas-liquid mass transfer mechanism 12 are used as a gas-liquid reinforced mass transfer device at the same time, so that the contact opportunity of dust in the flue gas and slurry is increased. Because the dust removal of the tray 8 and the S-shaped gas-liquid mass transfer mechanism 12 comprises the trapping effect of bubbles and liquid films on dust, the dust removal effect is higher than that of spraying, and especially the performance of removing fine dust of PM2.5 and below is very high, which is far higher than that of spraying and washing. Meanwhile, the non-uniform opening arrangement of the tray 8 plays a role in uniformly distributing air flow, and is also good in helping to improve the effect of the spraying layer. The concentration of dust at the outlet of the absorption tower is lower than 1mg/Nm3, so that the ultra-low emission requirement is met. Therefore, the embodiment realizes the ultralow emission of dust on the basis of realizing the ultralow emission of sulfur dioxide.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.
Claims (10)
1. The three-cycle U-shaped composite desulfurizing tower comprises a primary tower with a flue gas inlet at the upper part and a secondary tower with a flue gas outlet at the upper part, wherein the primary tower and the secondary tower are connected into a U-shaped tower body, a slurry tank is arranged at the lower part of the tower body, and a flue gas channel for communicating the primary tower and the secondary tower is arranged above the slurry tank; the secondary tower is a countercurrent composite tower, an absorption area of the secondary tower comprises a tray, a plurality of layers of secondary tower spraying layers, a liquid holding layer and a horizontal flue demisting section from bottom to top, wherein the liquid holding layer comprises a liquid collector, an S-shaped gas-liquid mass transfer mechanism and a liquid distributor which are sequentially arranged from bottom to top, and an outlet of the liquid collector and an inlet of the liquid distributor are connected through a liquid holding layer slurry circulating pump and a circulating pipe, so that the liquid holding layer is an independent circulating system.
2. The three-cycle U-shaped composite desulfurization tower of claim 1, further comprising a primary tower slurry circulation pump and a secondary tower slurry circulation pump, wherein the primary tower spray layer is connected to the slurry tank through the primary tower slurry circulation pump and the slurry circulation pipe, and the secondary tower spray layer is connected to the slurry tank through the secondary tower slurry circulation pump and the slurry circulation pipe.
3. The three-cycle U-shaped composite desulfurizing tower according to claim 2, wherein the outlet of the liquid collector is provided with a branch pipe connected with the desulfurizing agent replenishing inlet of the slurry circulating pump of the secondary tower.
4. The three-cycle U-shaped composite desulfurizing tower according to claim 1, wherein said slurry tank is filled with limestone-gypsum slurry, and the pH value of said limestone-gypsum slurry is 5.2-5.8.
5. The three-cycle U-shaped composite desulfurizing tower of claim 1, wherein the liquid-holding layer circulating slurry is limestone gypsum slurry, and the pH value of the limestone gypsum slurry is 5.8-6.4.
6. The three cycle U-shaped composite desulfurization tower of claim 5, wherein said liquid-holding slurry circulation pump inlet desulfurization replenishing inlet is used to replenish said limestone-gypsum slurry.
7. The three cycle U-shaped composite desulfurization tower of claim 1, wherein the secondary tower further comprises an in-tower mist eliminator comprising a lower liquid-holding layer mist eliminator disposed below the liquid-holding layer and an upper liquid-holding layer mist eliminator disposed above the liquid-holding layer.
8. The three-cycle U-shaped composite desulfurizing tower of claim 1, wherein the horizontal flue demister section is provided with a two-stage or three-stage high efficiency flue demister.
9. The three-cycle U-shaped composite desulfurizing tower according to claim 1, wherein a plurality of oxidized air pipes are arranged in the slurry tank; the slurry tank is also provided with a jacking stirrer or a plurality of side-entering stirrers.
10. The three-cycle U-shaped composite desulfurizing tower according to claim 1, wherein the cross section of the lower slurry tank of the tower body is rectangular, and the cross sections of the primary tower and the secondary tower are rectangular or square.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321504847.4U CN220276673U (en) | 2023-06-13 | 2023-06-13 | Three-circulation U-shaped composite desulfurizing tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321504847.4U CN220276673U (en) | 2023-06-13 | 2023-06-13 | Three-circulation U-shaped composite desulfurizing tower |
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