CN216677355U - Desulfurizing tower defroster and use its desulfurizing tower - Google Patents
Desulfurizing tower defroster and use its desulfurizing tower Download PDFInfo
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- CN216677355U CN216677355U CN202122874836.2U CN202122874836U CN216677355U CN 216677355 U CN216677355 U CN 216677355U CN 202122874836 U CN202122874836 U CN 202122874836U CN 216677355 U CN216677355 U CN 216677355U
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Abstract
The utility model provides a demister for a desulfurizing tower, which comprises a first backwashing spray module, an inertia momentum separation module, a second backwashing spray module and a fiber coagulation separation module which are sequentially arranged at intervals according to the flow direction of flue gas; the fiber coagulation and separation module comprises a mixed fiber module, and a second upper pressing beam and a second lower supporting beam which are arranged on the upper end surface and the lower end surface of the mixed fiber module; and the first backwashing spray module and the second backwashing spray module are respectively used for spraying and backwashing the inertia momentum separation module and the fiber coagulation separation module. The utility model also provides a desulfurizing tower comprising the demister. Compared with the prior art, the demister has higher flue gas demisting efficiency, and meanwhile, the cost of improving, maintaining and operating the demister is reduced.
Description
Technical Field
The utility model belongs to the technical field of demisting devices of desulfurizing towers, and particularly relates to a demister of a desulfurizing tower and a desulfurizing tower using the demister.
Background
The serious condition of chimney smoke discharge and rain drift existing in wet flue gas desulfurization and washing can cause pollution to the periphery of the device, and particularly in winter, the rain drift of the chimney can form thick ice on a tower, a pipeline and an operation field; the problem of the rain drift of the flue gas can be aggravated by carrying out flushing on the internal separating parts in the desulfurization washing tower according to the requirement of the original process on the spraying and washing strength, so that in order to alleviate the rain drift of the flue gas, measures for reducing the spraying and washing strength are usually adopted, which causes that dust and salt crystal particles accumulated on the internal separating parts cannot be effectively removed in time, and the more the dust and salt crystal particles are accumulated, the more the dust and salt crystal particles are gradually blocked, so that the blockage of the internal parts of the desulfurization tower is aggravated, the operating pressure drop rises rapidly, and the cycle is repeated and vicious.
After years of research and verification by professional kinetic separation technology companies at home and abroad, the chimney smoke rain condition is consistently considered to be a human sensory reaction event caused by that liquid drops with the size of more than 100 microns fall to the ground due to the fact that the gravity of the liquid drops is larger than the buoyancy and viscous force of the liquid drops in smoke and the liquid drops are not reduced to the boundary size by pushing vaporization through gas-liquid phase balance. The chimney flue gas rain is caused by gas-liquid carrying formed by four different areas and different mechanisms of the desulfurizing tower and the chimney, wherein the gas-liquid carrying formed by spraying and washing in the desulfurizing tower is the main contradiction, and the gas flow purification under the variable working condition of actual operation can be effectively solved only by arranging a high-performance gas-liquid separator.
The Chinese patent CN104801116B discloses a wet desulfurization tower demister, wherein a novel flue gas gallery channel formed by a plurality of layers of angle steels with downward openings can give consideration to structural strength, manufacturing cost and maintenance convenience on the premise of achieving the same demisting effect, but the demister needs to be removed for cleaning when cleaning is needed; chinese patent CN107308805A discloses a defogging device and a desulfurization dust collector for a desulfurization tower, which uses an annular structure formed by blades as a defogging component to alleviate the problems of frequent replacement of a defogging filler and troublesome separation of the desulfurization tower, but this method needs an axial flow exhaust fan to pump the gas in the desulfurization tower into the defogging device, which increases the operation and maintenance costs.
Therefore, there is still a need to design a demister for a desulfurization tower, so as to reduce the operation, maintenance and modification costs while improving the separation efficiency and separation precision.
SUMMERY OF THE UTILITY MODEL
In view of the defects in the prior art, the technical problem to be solved by the utility model is to provide a demister for a desulfurization tower to improve the demisting efficiency of flue gas and reduce the operation and maintenance cost of the demisting device.
The technical scheme of the utility model is as follows: a demister of a desulfurizing tower comprises a first backwashing spray module, an inertia momentum separation module, a second backwashing spray module and a fiber coagulation separation module which are sequentially arranged at intervals according to the flowing direction of flue gas; the inertial momentum separation module comprises a special-shaped fin module, a first upper pressing beam and a first lower supporting beam which are arranged on the upper end surface and the lower end surface of the special-shaped fin module, and the fiber coagulation separation module comprises a mixed fiber module, a second upper pressing beam and a second lower supporting beam which are arranged on the upper end surface and the lower end surface of the mixed fiber module; and the first backwashing spray module and the second backwashing spray module are respectively used for backwashing the inertia momentum separation module and the fiber coagulation separation module.
The utility model is further provided that the inertia momentum separation module and the fiber coagulation separation module are both cylindrical modules, and the diameters of the inertia momentum separation module and the fiber coagulation separation module are equal to the inner diameter of the desulfurizing tower so as to cover the whole flue gas flow cross section of the desulfurizing tower where the inertia momentum separation module and the fiber coagulation separation module are located.
The utility model is further arranged in that the first upper pressing beam and the first lower supporting beam, and the second upper pressing beam and the second lower supporting beam respectively comprise a plurality of horizontal rods arranged side by side, two ends of each horizontal rod are respectively provided with a fixed support fixed on the inner side wall of the desulfurizing tower, and two ends of each horizontal rod are arranged on the fixed supports and are fixed through bolts.
The backwashing water supply system is further provided with a first backwashing spray module and a second backwashing spray module which respectively comprise a plurality of backwashing support beams arranged side by side and backwashing distribution pipes arranged on the backwashing support beams, wherein each backwashing distribution pipe comprises a backwashing main pipe and backwashing branch pipes uniformly distributed on two sides of the backwashing main pipe by taking the backwashing main pipe as an axis, and the backwashing branch pipes are communicated with the backwashing main pipe; each backwashing branch pipe is uniformly distributed with a plurality of backwashing nozzles at the top for spraying backwashing liquid, and one end of the backwashing main pipe is provided with a backwashing liquid inlet.
The length of the backwashing main pipe is consistent with the inner diameter of the desulfurizing tower, two ends of each backwashing supporting beam are detachably fixed on the inner side wall of the desulfurizing tower, and each backwashing supporting beam is fixed with the backwashing branch pipe.
The utility model is further set in that the jet angle range of the backwashing jet head is 90-120 degrees, and the spraying coverage rate is 150-250 percent.
The special-shaped fin module further comprises a plurality of special-shaped fins which are arranged side by side and are vertically arranged, the distance between every two adjacent special-shaped fins is 5-50 mm, the thickness of each special-shaped fin is 0.5-5 mm, and the length of each special-shaped fin along the flowing direction of flue gas is 100-1000 mm.
The utility model is further provided that the mixed-woven fiber module comprises at least two kinds of fiber yarns, the yarn diameter of the fiber yarns is 50-500 mu m, and the length of the mixed-woven fiber module along the flowing direction of the flue gas is 100-800 mm.
The utility model is further provided that the distance between the first backwashing spray module and the inertia momentum separation module is 0.5-1.5 m, and the distance between the second backwashing spray module and the fiber coagulation separation module is 0.5-1 m.
The utility model also provides a desulfurization flue gas desulfurization tower which comprises a desulfurization tower body, a desulfurization tower tray arranged inside the desulfurization tower body and a demister arranged above the desulfurization tower tray, wherein a flue gas inlet is formed in the desulfurization tower body below the desulfurization tower tray, and the demister is adopted.
The utility model is further set that the flow velocity of the flue gas in the desulfurizing tower in the demister section is 0.5-15 m/s.
The utility model has the following beneficial effects: compared with the prior art, the utility model adopts the multi-module combined demister of the desulfurizing tower, improves the separation efficiency and the separation precision, reduces the rain falling condition of flue gas, solves the problem of blockage in the desulfurizing tower and greatly reduces the operation and maintenance cost of the demister; the demister disclosed by the utility model is installed in the existing desulfurizing tower, the installation process is simple, and the modification cost is low.
Drawings
FIG. 1 is a schematic view of the installation position of the demister of the utility model inside a desulfurization tower, wherein arrows indicate the flow direction of flue gas.
FIG. 2 is a schematic diagram of an inertial momentum separation module;
FIG. 3 is a schematic view of the fiber coalescing separation module structure;
FIG. 4 is a schematic diagram of a backwash spray module;
FIG. 5 is a schematic view of the internal structure of a desulfurizing tower according to the present invention;
FIG. 6 is a schematic view of the internal structure of the original desulfurizing tower in the embodiment.
Wherein: 1. the backwashing water separation device comprises a first backwashing spray module, 1-1 parts of a backwashing support beam, 1-2 parts of a backwashing main pipe, 1-3 parts of a backwashing branch pipe, 1-4 parts of a backwashing spray head, 1-5 parts of a backwashing liquid inlet, 2 parts of an inertia momentum separation module, 2-1 parts of a special-shaped fin module, 2-2 parts of a first upper pressure beam, 2-3 parts of a first lower support beam; 3. a second backwashing spray module; 4. the device comprises a fiber coagulation separation module, 4-1, a mixed fiber module, 4-2, a second upper pressure beam, 4-3, a second lower support beam, 5, a desulfurizing tower body, 6, a desulfurizing tower tray, 7 and a demisting packing layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to fig. 3, the demister for a desulfurization tower provided by the present invention comprises a first backwashing spray module 1, an inertia momentum separation module 2, a second backwashing spray module 3 and a fiber coagulation separation module 4 which are sequentially arranged at intervals according to a flue gas flow direction; the inertia momentum separation module 2 comprises a special-shaped fin module 2-1, and a first upper pressure beam 2-2 and a first lower support beam 2-3 which are respectively arranged on the upper end surface and the lower end surface of the special-shaped fin module 2-1 and used for fixing the special-shaped fin module 2-1, the fiber coagulation separation module 4 comprises a mixed fiber module 4-1, and a second upper pressing beam 4-2 and a second lower supporting beam 4-3 which are respectively arranged on the upper end surface and the lower end surface of the mixed fiber module 4-1 and used for fixing the mixed fiber module 4-1, the first upper pressing beam 2-2 and the first lower supporting beam 2-3, both ends of the second upper pressing beam 4-2 and the second lower supporting beam 4-3 are detachably fixed on the inner side wall of the desulfurizing tower; the first backwashing spray module 1 and the second backwashing spray module 3 are respectively used for spraying and backwashing the inertia momentum separation module 2 and the fiber coagulation separation module 4.
In this embodiment, the inertia momentum separation module 2 and the fiber coagulation separation module 4 are both cylindrical modules, and the diameters of the inertia momentum separation module 2 and the fiber coagulation separation module 4 are equal to the inner diameter of the desulfurization tower, so as to cover the whole flue gas flow cross section of the desulfurization tower where the inertia momentum separation module and the fiber coagulation separation module are located.
In this embodiment, the first upper pressing beam 2-2 and the first lower supporting beam 2-3, and the second upper pressing beam 4-2 and the second lower supporting beam 4-3 each include a plurality of horizontal rods arranged side by side, two ends of each horizontal rod are provided with fixing supports (not shown in the figure), the fixing supports are fixed on the inner side wall of the desulfurization tower, and two ends of each horizontal rod are arranged on the fixing supports and fixed by bolts.
As shown in fig. 4, the first backwashing spray module 1 and the second backwashing spray module 3 both comprise a plurality of backwashing support beams 1-1 arranged side by side and backwashing distribution pipes arranged on the backwashing support beams 1-1, each backwashing distribution pipe comprises a backwashing main pipe 1-2 and backwashing branch pipes 1-3 uniformly distributed on two sides of the backwashing main pipe 1-2 by taking the backwashing main pipe 1-2 as an axis, the backwashing branch pipes 1-3 are communicated with the backwashing main pipe 1-2, a plurality of backwashing nozzles 1-4 are uniformly distributed on the top of each backwashing branch pipe 1-3 and used for spraying backwashing liquid, and one end of the backwashing main pipe 1-2 is provided with a backwashing liquid inlet 1-5. The backwashing spray module is used for avoiding blockage inside the demister.
In this embodiment, the length of the backwash main pipe 1-2 is the same as the inner diameter of the desulfurization tower, two ends of each backwash support beam 1-1 are detachably fixed on the inner side wall of the desulfurization tower, and each backwash support beam 1-1 is fixed with the backwash branch pipe 1-3.
Further, the jetting angle range of the backwashing nozzles 1-4 is 90-120 degrees, and the spraying coverage rate is 150-250%, preferably 180%.
In the embodiment, the special-shaped fin module 2-1 comprises a plurality of special-shaped fins which are arranged side by side and are vertically arranged, the distance between every two adjacent special-shaped fins is 5-50 mm, the thickness of each special-shaped fin is 0.5-5 mm, and the length of each special-shaped fin along the flowing direction of flue gas is 100-1000 mm; the removal efficiency of the special-shaped fin module 2-1 on liquid drops with the particle size of more than 5 mu m is more than 99 percent.
Further, the mixed-woven fiber module 4-1 is woven by at least 2 metal or nonmetal fiber wires with the wire diameter of 50-500 mu m, such as S31603 and PTFE, and the length of the mixed-woven fiber module 4-1 in the flowing direction of flue gas is 100-800 mm; the fiber mixed module 4-1 has a removal efficiency of more than 99% for liquid drops with a particle size of more than 1 μm.
The utility model also provides a desulfurization flue gas desulfurization tower, which comprises a desulfurization tower body 5, a desulfurization tower tray 6 arranged inside the desulfurization tower body 5 and a demister arranged above the desulfurization tower tray 6, wherein the demister adopts the above demister, the desulfurization tower body 5 below the desulfurization tower tray 6 is provided with a flue gas inlet, and the top of the desulfurization tower body 5 is provided with a flue gas outlet.
When the demister is installed, the first lower supporting beam 2-3, the second lower supporting beam 4-3 and the backwashing supporting beam 1-1 of the first backwashing spray module 1 and the second backwashing spray module 3 are fixedly installed in the desulfurizing tower; then a backwash liquid distribution pipe of the first backwash spray module 1, a special-shaped fin module 2-1 of the inertia momentum separation module 2 and a first upper pressure beam 2-2 are sequentially installed; and installing a backwash liquid distribution pipe of a second backwash spray module 3, and finally installing a mixed fiber module 4-1 and a second upper pressure beam 4-2 of the fiber coagulation separation module 4. The distance between the first backwashing spray module 1 and the inertia momentum separation module 2 is 0.5-1.5 m, and the distance between the second backwashing spray module 3 and the fiber coagulation separation module 4 is 0.5-1 m.
It should be noted that the first backwashing spray module 1, the inertia momentum separation module 2, the second backwashing spray module 3 and the fiber coagulation separation module 4 can enter the inside of the tower body from a manhole of the desulfurization tower.
Further, the flue gas flow velocity in the first backwashing spray module 1, the inertia momentum separation module 2, the second backwashing spray module 3 and the fiber coagulation separation module 4 is 0.5-15 m/s. And when the integral pressure drop of the demister is more than 1200Pa or exceeds 50% of the designed pressure drop, starting the backwashing spray module for backwashing.
The demister of the original desulfurizing tower of a certain northern refinery mainly adopts demisting filler with a return-type structure, the diameter of a demisting section cylinder is 7.5m, the height of the demisting section cylinder is 2.5m, and the flue gas flow is 34.242 multiplied by 104Nm3The operational flexibility is 60-110%.
As shown in figure 6, the original demister of the desulfurizing tower is a demisting packing layer 7 with a height of about 2.5m, the packing is fully distributed on the whole flue gas flow cross section, along with the increase of the service time, the separation effect of the demister is reduced, the pressure loss is increased, the flow of treated flue gas is reduced, and the phenomenon of rain drifting around a chimney is caused.
The original demister in the factory is replaced by the demister of the utility model, the height of the demisting section is 2.2m, the height of the inertia momentum separation module 2 is 600mm, the space between the special-shaped fins is 12mm, the thickness of the special-shaped fins is 1mm, the height of the fiber coagulation separation module 4 is 400mm, and the mixed fiber module 4-1 is composed of S31603 and PTFE fiber yarns.
After replacement, the integral pressure drop of the demister is less than 0.7kPa, and the concentration of particulate matters at the outlet of the flue gas desulfurization tower is less than 30mg/Nm3(3.0％mol O2Dry basis), the fog drop concentration is less than 0.05 wt%, the fume discharged from the fume desulfurizing tower does not generate water drop phenomenon all the year round within the range of 500m of the peripheral radius of the chimney, and the ground is not frozen within the range of 300m of the peripheral radius of the chimney when the environmental temperature is lower than minus 25 ℃ in winter. Compared with the prior art, the demister has a better demisting effect, and the condition that smoke floats in the rain is obviously improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A demister of a desulfurizing tower is characterized by comprising a first backwashing spray module, an inertia momentum separation module, a second backwashing spray module and a fiber coagulation separation module which are sequentially arranged at intervals according to the flow direction of flue gas; the inertial momentum separation module comprises a special-shaped fin module, a first upper pressing beam and a first lower supporting beam which are arranged on the upper end surface and the lower end surface of the special-shaped fin module, and the fiber coagulation separation module comprises a mixed fiber module, a second upper pressing beam and a second lower supporting beam which are arranged on the upper end surface and the lower end surface of the mixed fiber module; and the first backwashing spray module and the second backwashing spray module are respectively used for backwashing the inertia momentum separation module and the fiber coagulation separation module.
2. The demister as claimed in claim 1, wherein the inertial momentum separation module and the fiber coagulation separation module are both cylindrical modules, and the diameters of the inertial momentum separation module and the fiber coagulation separation module are equal to the inner diameter of the desulfurizing tower so as to cover the whole flue gas flow cross section at the position of the desulfurizing tower.
3. The demister as claimed in claim 1, wherein the first upper pressing beam and the first lower supporting beam, and the second upper pressing beam and the second lower supporting beam each comprise a plurality of horizontal rods arranged side by side, each of the horizontal rods has a fixing support at both ends, the fixing supports are fixed on the inner side wall of the desulfurization tower, and the two ends of the horizontal rods are arranged on the fixing supports and fixed by bolts.
4. The demister of claim 1, wherein the first backwashing spray module and the second backwashing spray module each comprise a plurality of backwashing support beams arranged side by side and backwashing distribution pipes arranged on the backwashing support beams, the backwashing distribution pipes comprise a backwashing main pipe and backwashing branch pipes uniformly distributed on two sides of the backwashing main pipe by using the backwashing main pipe as an axis, and the backwashing branch pipes are communicated with the backwashing main pipe; each backwashing branch pipe is uniformly distributed with a plurality of backwashing nozzles at the top for spraying backwashing liquid, and one end of the backwashing main pipe is provided with a backwashing liquid inlet.
5. The demister as claimed in claim 4, wherein the length of the backwash main pipe is the same as the inner diameter of the desulfurization tower, both ends of each backwash support beam are detachably fixed on the inner side wall of the desulfurization tower, and each backwash support beam is fixed with the backwash branch pipe.
6. The demister as claimed in claim 4, wherein the back washing spray head has a spray angle of 90-120 ° and a spray coverage of 150-250%.
7. The demister as claimed in claim 1, wherein the special-shaped fin module comprises a plurality of special-shaped fins which are arranged side by side and vertically, the distance between two adjacent special-shaped fins is 5-50 mm, the thickness of the special-shaped fin is 0.5-5 mm, and the length of the special-shaped fin along the flow direction of flue gas is 100-1000 mm.
8. The demister as claimed in claim 1, wherein the mixed fiber module comprises at least two kinds of fiber filaments, the filament diameter of the fiber filaments is 50-500 μm, and the length of the mixed fiber module along the flue gas flowing direction is 100-800 mm.
9. A desulfurizing tower comprises a desulfurizing tower body, a desulfurizing tower tray arranged in the desulfurizing tower body and a demister arranged above the desulfurizing tower tray, wherein a flue gas inlet is formed in the desulfurizing tower body below the desulfurizing tower tray, and the demister is characterized in that the demister of any one of claims 1 to 8 is adopted.
10. The desulfurization tower of claim 9, wherein the flow velocity of the flue gas in the desulfurization tower in the demister section is 0.5-15 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122874836.2U CN216677355U (en) | 2021-11-22 | 2021-11-22 | Desulfurizing tower defroster and use its desulfurizing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122874836.2U CN216677355U (en) | 2021-11-22 | 2021-11-22 | Desulfurizing tower defroster and use its desulfurizing tower |
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| Publication Number | Publication Date |
|---|---|
| CN216677355U true CN216677355U (en) | 2022-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122874836.2U Active CN216677355U (en) | 2021-11-22 | 2021-11-22 | Desulfurizing tower defroster and use its desulfurizing tower |
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| CN (1) | CN216677355U (en) |
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- 2021-11-22 CN CN202122874836.2U patent/CN216677355U/en active Active
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