CN219111302U - Spraying tray bubbling double-circulation desulfurization dust collector - Google Patents
Spraying tray bubbling double-circulation desulfurization dust collector Download PDFInfo
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- CN219111302U CN219111302U CN202222553015.3U CN202222553015U CN219111302U CN 219111302 U CN219111302 U CN 219111302U CN 202222553015 U CN202222553015 U CN 202222553015U CN 219111302 U CN219111302 U CN 219111302U
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Abstract
The utility model relates to a spraying tray bubbling double-circulation desulfurization dust removal device, which comprises an absorption tower and a chimney, wherein the absorption tower is internally divided into a tray spraying bin and a slurry spraying bin by a tray, the tray is provided with tray holes, overflow branch pipes are vertically arranged on the tray, overflow ports are arranged at the upper ends of the overflow branch pipes, and the lower ends of the overflow branch pipes are connected to an overflow main pipe; the slurry spraying bin is internally provided with slurry, a slurry spraying layer is arranged between the lower part of the tray and the liquid level of the slurry, and the slurry spraying layer is communicated with the slurry through a pipeline and a spraying pump; the tray spraying bin is provided with a tray spraying layer above the tray, and the tray spraying layer is communicated with the slurry in the slurry spraying bin through a pipeline and a tray circulating pump. The utility model solves the problems of low desulfurization and dust removal efficiency, easy scaling of the tray, unstable influence of the load of the flue gas on the liquid holding layer of the tray, and secondary pollution caused by haze generated in the outlet flue gas of the existing spray tray tower.
Description
Technical Field
The utility model relates to the technical field of air pollution dust removal, in particular to a spraying tray bubbling double-circulation desulfurization dust removal device.
Background
At present, most coal-fired units can reach 10mg/m of smoke dust after desulfurization, upgrading and reconstruction 3 35mg/m sulfur dioxide 3 Nitrogen oxides 50mg/m 3 Is required for ultra low emission. Most of the projects are modification of the desulfurizing tower by adding trays at the bottom. At present, trays in a desulfurizing tower are generally arranged at the upper end of a smoke inlet or between spraying layers, and no matter how many layers of trays are arranged, the upper part of the desulfurizing tower is provided with the spraying layers. This arrangement results in a large amount of spray slurry being necessary to achieve ultra low sulfur dioxide emissions from the flue gas. And finally, the concentration of sulfur dioxide in the flue gas is low, so that the spraying efficiency is extremely low, and a large amount of circulating spraying amount is wasted and the energy consumption is high.
After the flue gas enters the desulfurizing tower, the flue gas is rectified through the tray, so that the flue gas is uniformly distributed on the section of the desulfurizing tower, the flue gas upwards passes through the tray openings, so that the flue gas contacts with the falling slurry sprayed by the spraying layer, a violent collision reaction occurs, sulfur dioxide in the flue gas is removed, the desulfurizing efficiency is improved, and the slurry subsequently passes through the tray openings and falls into a slurry pool at the bottom of the desulfurizing tower. The aperture on the tray not only passes through the flue gas, but also the thick liquid passes through from the tray hole, and when the load changes, the liquid-holding layer thickness on the tray is unstable, and then leads to desulfurization effect also unstable.
The tray is subject to the impact of the shower slurry for a long period of time and is susceptible to breakage and damage. Fouling and impurities in the column tend to cause plugging.
Because of countercurrent spraying, the flue gas and the slurry are collided vigorously, and a large number of extremely fine salt-containing fog drops can be formed. The demisting difficulty is caused, the investment of the demister is increased, and haze can be generated to cause secondary pollution.
To sum up: the existing spraying tray tower has the problems that the desulfurization and dust removal efficiency is low, the tray is easy to scale, the tray liquid-holding layer is unstable due to the influence of the flue gas load, the desulfurization effect is unstable, haze can be generated in the outlet flue gas, secondary pollution is caused, and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the spraying tray bubbling double-circulation desulfurization dust removal device, which solves the problem of unstable tray operation structure and liquid holding layer, fully utilizes the complementary advantages of spraying desulfurization and tray bubbling desulfurization, realizes desulfurization, energy conservation and consumption reduction, and achieves the purposes of deep desulfurization dust removal, synergistic removal of various pollutants and secondary pollution reduction.
The utility model is realized by the following technical scheme:
the utility model provides a spray tray bubbling dual-circulation desulfurization dust collector, which comprises an absorption tower, wherein the top of the absorption tower is provided with a chimney communicated with the inner cavity of the absorption tower, the inner cavity of the absorption tower is divided into a tray spray bin positioned above and a slurry spray bin positioned below by arranging a tray, and the absorption tower is provided with a smoke inlet on the slurry spray bin;
tray holes for flue gas to pass through are uniformly formed in the tray, a plurality of overflow branch pipes are vertically arranged on the tray, overflow ports are formed in the upper ends of the overflow branch pipes above the tray, and the lower ends of the overflow branch pipes are connected to an overflow main pipe below the tray;
the slurry spraying bin is internally provided with slurry, a slurry spraying layer is arranged between the lower part of the tray and the liquid level of the slurry, and the slurry spraying layer is communicated with the slurry through a pipeline and a spraying pump;
the tray spraying bin is provided with a tray spraying layer above the tray, and the tray spraying layer is communicated with the slurry in the slurry spraying bin through a pipeline and a tray circulating pump.
Further, the tray spraying layer is connected with a tray circulation box through a pipeline and a tray circulation pump, slurry containing a desulfurizing agent is arranged in the tray circulation box, and a reflow opening is formed in the top of the tray circulation box and is communicated with the overflow main pipe.
Further, the upper part of one side of the tray circulation box is communicated with the slurry spraying bin of the absorption tower through the overflow pipe of the circulation box, and the height of the end part of the overflow pipe of the circulation box, which is positioned in the slurry spraying bin, is positioned above the liquid level of the slurry.
The overflow pipe of the circulation box is mainly used for overflowing excessive slurry into the slurry spraying bin of the absorption tower through the overflow pipe of the circulation box after the desulfurizing agent is added to the tray circulation box.
Preferably, each overflow branch pipe is provided with an adjusting head at the overflow port, wherein the adjusting head can adjust the height of the liquid holding layer according to the concentration requirement of the outlet pollutant.
The height of the liquid-holding layer can be adjusted by the adjusting head according to the concentration requirement of the outlet pollutants, so that the adaptability of the system to the change of the concentration of the pollutants in the flue gas is improved.
Preferably, each overflow branch pipe is covered and provided with an overflow pipe cap above the overflow port.
Foam layers can be prevented from entering the overflow branch pipes by arranging the overflow pipe caps.
Preferably, tray partitions for uniformly partitioning the tray are arranged on the tray, and at least one overflow branch pipe is arranged in each partition.
The tray partition plate divides the tray according to the arrangement of the tower diameters, and at least one overflow pipe or a plurality of overflow pipes are arranged in each division, so that the liquid holding layers of each division are ensured to be consistent.
Further, a demister is arranged above the tray spraying layer in the absorption tower.
The main function of the demister is to remove fog drops in the flue gas, so that the content of fog drops in the flue gas at the outlet is less than 75-20mg/m 3 And determining the corresponding flue gas flow rate according to the specific form of installing the demister.
Preferably, the inner cavity of the absorption tower between the lower part of the demister and the slurry is divided into a left independent cavity and a right independent cavity by the vertical partition plate, each cavity is provided with a flue inlet in the slurry spraying bin of the absorption tower, and each flue inlet is provided with a flue gate.
The absorption tower is divided into two parts by the vertical partition plates, when the flue gas quantity is smaller than the design flue gas quantity, the flue gate of the small part is closed, and the operation of the absorption tower by adopting one part is ensured, so that the parameters such as the design flow rate and the like are in a reasonable range. The ratio of the two parts of the absorption tower can be 1:9,2:8,3:7,4:6 and 5:5 according to the flue gas variable quantity.
The utility model has the beneficial effects that:
1. high desulfurization efficiency and low operation cost: by adopting two desulfurization technologies of spraying and tray bubbling in the tower, spraying desulfurization is performed first, and the advantages of high desulfurization efficiency and low energy consumption when the spraying technology is low in liquid-gas ratio are fully utilized; after spray desulfurization, the absorbent is a continuous phase and the flue gas is a disperse phase by using a bubbling technology, so that the desulfurization device has the advantages of super strong mass transfer capability and deep desulfurization, and the two desulfurization purposes are achieved by combining the two desulfurization purposes. The desulfurization efficiency is improved by 40% compared with that of a spray tower and 25% compared with that of a spray tray tower.
2. Synergistic deep dedusting and removal of other contaminants: the total efficiency of the two times of dust removal can reach more than 98% after the primary spray dust removal and the secondary tray bubbling dust removal. When the dust content of the imported flue gas is lower than 150mg/m 3 When the concentration of the smoke dust at the outlet of the wet electric dust collector is not needed, the concentration of the smoke dust at the outlet of the wet electric dust collector can reach 5mg/m 3 The following is given. The removal rate of HCl and HF is more than 90%, the removal rate of mercury and cadmium is more than 50%, and the removal rate of selenium is more than 67%.
3. The desulfurizing tower has low height, less investment and high safety: the height of the desulfurizing tower is low because of fewer spraying layers, and the overall steel consumption is also reduced. The number of the circulating pumps is small, spray layer spray heads, pipelines and valves are small, and the power distribution system is simple; the concentration of smoke dust at the inlet of the desulfurizing tower can be widened to 150mg/m 3 The dust removal system can be simplified.
4. The pH value of the slurry of the spraying system is controlled between 4.5 and 5.0, the oxidation rate of the slurry is high, the dissolution rate of limestone is high, the utilization rate is high, the lime consumption is small, the limestone in the slurry is small, the scaling of a tray and a demister is difficult, and the blockage is difficult.
5. The haze is less, and secondary pollution is avoided: the flue gas emits ultrafine salt-containing fog drops which cannot be generated from slurry bubbles on the tray, the carrying amount of the fog drops in the flue gas is small, and the demister is easy to remove.
6. The impact of even spraying circulation liquid on the tray is little, and the tray is not fragile. Slurry thickness on the tray can be stably maintained, height can be adjusted, desulfurization efficiency is stable, and desulfurization effect is easy to adjust.
7. Because of the double circulation operation of spraying and bubbling, the flue gas is bubbled after being sprayed, foam can not be generated, and the desulfurization and dust removal effects can be better.
In conclusion, the utility model solves the problems of low desulfurization and dust removal efficiency, easy scaling of the tray, unstable influence of the smoke load on the liquid holding layer of the tray, and secondary pollution caused by haze generated in the outlet smoke of the existing spray tray tower.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present utility model.
Fig. 2 is a schematic overall structure of embodiment 2 of the present utility model.
Fig. 3 is a large view of the pallet of fig. 2.
Fig. 4 is a schematic overall structure of embodiment 3 of the present utility model.
The figure shows:
inlet I1, inlet II2, spray pump 3, slurry spray layer 4, tray 5, tray hole 6, overflow branch pipe 7, overflow pipe cap 8, tray circulation pump 9, tray circulation tank 10, overflow header 11, tray circulation tank overflow pipe 12, tray spray layer 13, demister 14, adjusting head 15, chimney 16, tray spray bin 17, slurry spray bin 18, tray partition 19, vertical partition 20, flue gate I21, flue gate II22.
Detailed Description
In order to clearly illustrate the technical characteristics of the scheme, the scheme is explained below through a specific embodiment.
Example 1:
the utility model provides a spray tray bubble dual cycle desulfurization dust collector, includes the absorption tower, the top of absorption tower is provided with the chimney 16 with absorption tower inner chamber intercommunication, separates the absorption tower inner chamber into the tray that is located the top and sprays storehouse 17 and the thick liquid that is located the below and spray storehouse 18 through setting up tray 5 in the absorption tower, and the absorption tower has seted up the inlet flue on thick liquid sprays storehouse 18.
Tray holes 6 for flue gas to pass through are uniformly formed in the tray 5, a plurality of overflow branch pipes 7 are vertically arranged on the tray 5, overflow ports are formed in the upper ends of the overflow branch pipes 7 above the tray 5, the lower ends of the overflow branch pipes 7 are connected to an overflow main pipe 11 below the tray 5, and the overflow main pipe 11 is directly inserted into slurry in a spraying bin 18.
The slurry spraying bin 18 is internally provided with slurry, a slurry spraying layer 4 is arranged between the lower part of the tray 5 and the liquid level of the slurry, and the slurry spraying layer 4 is communicated with the slurry through a pipeline and a spraying pump 3;
the tray spraying bin 17 is provided with a tray spraying layer 13 above the tray 5, and the tray spraying layer 13 is communicated with the slurry in the slurry spraying bin 18 through a pipeline and the tray circulating pump 9.
Example 2:
the utility model provides a spray tray bubble dual cycle desulfurization dust collector, includes the absorption tower, the top of absorption tower is provided with the chimney 16 with absorption tower inner chamber intercommunication, separates the absorption tower inner chamber into the tray that is located the top and sprays storehouse 17 and the thick liquid that is located the below and spray storehouse 18 through setting up tray 5 in the absorption tower, and the absorption tower has seted up the inlet flue on thick liquid sprays storehouse 18. A demister 14 is installed above the tray spray layer 17 in the absorption tower.
Tray holes 6 for flue gas to pass through are uniformly formed in the tray 5, the aperture ratio of the tray 5 is 30% -35%, and the aperture diameter of the tray holes 6 is generally 8-15mm. The open pore form can be round hole, square hole, bar hole etc. multiple shapes. The tray 5 is vertically provided with a plurality of overflow branch pipes 7, the upper end of each overflow branch pipe 7 is provided with an overflow port above the tray 5, and the lower end of each overflow branch pipe 7 is connected to an overflow header pipe 11 below the tray 5.
The tray spraying bin 17 is provided with a tray spraying layer 13 above the tray 5, the tray spraying layer 13 is connected with a tray circulation box 10 through a pipeline and a tray circulation pump 9, slurry containing a desulfurizing agent is arranged in the tray circulation box 10, and the top of the tray circulation box 10 is provided with a return port and is communicated with an overflow main pipe 11. The tray spraying layer 13 is arranged above the tray 5 and is connected with the external tray circulating pump 9 and the tray circulating box 10 to form an independent circulating system, and the pH value is controlled to be 4.5-5, so that scaling of the tray holes 6 is prevented.
The slurry spraying bin 18 is internally provided with slurry, and a slurry spraying layer 4 is arranged between the lower part of the tray 5 and the liquid level of the slurry, and the slurry spraying layer 4 is communicated with the slurry through a pipeline and a spraying pump 3. The slurry spraying layer 4 can be oneLayers or multiple layers, and the residual sulfur dioxide in the flue gas after slurry spraying is controlled at 600mg/m 3 Left and right.
Each overflow branch pipe 7 is provided with an adjusting head 15 at the overflow port, which can adjust the height of the liquid holding layer according to the concentration requirement of the outlet pollutant. And each overflow branch pipe 7 is covered and provided with an overflow pipe cap 8 above the overflow port.
The tray 5 is provided with tray partitions 19 for uniformly partitioning the tray 5, and at least one overflow branch pipe 7 is arranged in each partition.
The upper part of one side of the tray circulation box 10 is communicated with a slurry spraying bin 18 of the absorption tower through a circulation box overflow pipe 12, and the height of the end part of the circulation box overflow pipe 12 positioned in the slurry spraying bin 18 is above the liquid level of the slurry.
The working principle is as follows: the flue gas enters the slurry spraying bin 18 through the flue gas inlet I1, after the slurry spraying bin 18 sprays through the slurry spraying layer 4, the flue gas enters the liquid holding layer in the tray 5 through the tray holes 6 on the tray, strong impact is generated on the liquid holding layer, a bubble layer is formed, after the flue gas is sprayed and washed through the tray spraying layer 13 in the tray spraying bin 17, the flue gas is discharged into the atmosphere through the chimney 16 after being defogged through the defogger 14.
The main function of the slurry spraying bin 18 is to carry out preliminary desulfurization on flue gas, the flue gas enters the slurry spraying bin 18 through the flue gas inlet 1 and the flue gas inlet 2, and the spraying pump 3 extracts slurry from the slurry pool and carries out preliminary desulfurization on the flue gas through the slurry spraying layer 4. The slurry sprayed from the slurry spraying layer 4 and the upward flue gas are in countercurrent meeting reaction. The liquid-gas ratio and the number of layers of the slurry spraying layer 4 can be determined according to the sulfur content in the entering flue gas. The sulfur dioxide in the flue gas is treated to the concentration of about 600mg/m by spraying of the slurry spraying layer 4 3 The smoke dust can be removed by 40-60%. Providing favorable conditions for the desulfurization of the tray 5 in the next step. The desulfurizing agent is supplemented to the slurry pool at the bottom of the absorption tower in operation.
The tray 5 mainly carries out bubbling desulfurization on the flue gas, the flue gas is uniformly distributed below the tray 5 after being sprayed by the slurry spraying layer 4, the flue gas passes through the tray holes 6 under the action of the flue gas pressure, strong impact is generated on the slurry on the tray 5, a severely disturbed foam layer is formed, the flue gas and the slurry are fully mixed, and sulfur dioxide and fine smoke are completely dissolvedSulfur dioxide and fine dust are removed simultaneously in the slurry and the liquid film on the surface of the bubbles. Because the absorbent is a continuous phase and the flue gas is a disperse phase, the limitation of the critical chemical reaction speed is reduced, the mass transfer capacity is super strong, the desulfurization efficiency can easily reach more than 99 percent, and the sulfur dioxide content in the flue gas reaches 10mg/m 3 The following is given. The dust removal effect is also good, and according to the related information, the trapping rate of dust with the particle size of more than 2 mu m is more than 99%, the trapping rate of dust with the particle size of 0.3-3 mu m is more than 82%, and the trapping rate of dust with the particle size of less than 0.3 mu m is 95%. The removal rate of HCl and HF is more than 90%, the removal rate of mercury and cadmium is more than 50%, and the removal rate of selenium is more than 67%. The overflow branch pipe 7 on the tray 5 is provided with an adjusting head 15, and the height of the liquid holding layer can be adjusted by the adjusting head 15 according to the concentration requirement of the outlet pollutant, so that the adaptability of the system to the change of the concentration of the pollutant in the flue gas is improved. The overflow pipe cap 8 can prevent foam layers from entering the overflow pipeline 7, and the tray partition 19 partitions the tray 5 according to the tower diameter arrangement, and at least one overflow pipe or a plurality of overflow pipes are arranged in each partition, so that the liquid holding layers of each partition are consistent, as shown in fig. 2.
The main function of the tray spraying bin 17 is to further desulfurize and dust the flue gas, and the flue gas continuously rises along the desulfurizing tower after being desulfurized by slurry bubbling on the tray holes 6, and enters the demister 14 after being further desulfurized and dust-removed by the tray spraying layer 13. The tray spraying layer 13 is connected with the tray circulating pump 9, the tray circulating pump 9 extracts the desulfurization liquid from the tray circulating box 10 and supplies the desulfurization liquid to the tray spraying layer 13, the sprayed slurry falls to the tray 5, the slurry flows back to the tray circulating box 10 through the overflow manifold 11 by the overflow branch pipe 7 on the tray 5, the desulfurization agent is added to the tray circulating box 10, and the excessive slurry overflows into the slurry at the bottom of the absorption tower through the overflow pipe 12 of the tray circulating box. The pH of the slurry in the tray circulation box 10 is controlled between 4.5 and 5, and the slurry is acidic, so that the tray holes 6 on the tray 5 can be prevented from scaling. The main function of the tray spray layer 13 is to uniformly replenish the tray 5 with slurry.
Example 3:
in this embodiment, on the basis of embodiment 2, the inner cavity of the absorption tower between the lower part of the demister 14 and the slurry is divided into left and right independent chambers by arranging a vertical partition 20 in the absorption tower, each chamber is provided with a smoke inlet in the slurry spraying bin 18 of the absorption tower, as shown in fig. 3, a smoke inlet I1 and a smoke inlet II2, the smoke inlet I is provided with a flue gate I21, and the smoke inlet II2 is provided with a flue gate II22.
The vertical partition 20 divides the absorption tower into two small absorption towers, and the main function is that when the flue gas volume is less than the design flue gas volume, one of the flue gate I21 or the flue valve II22 can be closed, and the absorption tower is divided into two parts through the vertical partition 20, can adopt half absorption tower operation, guarantees parameters such as design velocity of flow in reasonable scope.
The inner cavity of the absorption tower is equally divided into a left part and a right part by the vertical partition plate 20, and the two parts can be divided into 1 according to the change condition of the smoke quantity: 9,2:8,3:7,4:6,5:5. set up the inlet respectively, can satisfy the control and the distribution of exhaust gas volume, can close an inlet when exhaust gas volume changes, and then use the operation of the absorption tower of the other half, and then realize the stable effect of tray liquid-holding layer.
Of course, the above description is not limited to the above examples, and the technical features of the present utility model that are not described may be implemented by or by using the prior art, which is not described herein again; the above examples and drawings are only for illustrating the technical scheme of the present utility model and not for limiting the same, and the present utility model has been described in detail with reference to the preferred embodiments, and it should be understood by those skilled in the art that changes, modifications, additions or substitutions made by those skilled in the art without departing from the spirit of the present utility model and the scope of the appended claims.
Claims (8)
1. The utility model provides a spray tray bubble dual cycle desulfurization dust collector, includes the absorption tower, the top of absorption tower be provided with the chimney of absorption tower inner chamber intercommunication, its characterized in that: the inner cavity of the absorption tower is divided into a tray spraying bin positioned above and a slurry spraying bin positioned below by arranging a tray, and a smoke inlet is formed in the slurry spraying bin of the absorption tower;
tray holes for flue gas to pass through are uniformly formed in the tray, a plurality of overflow branch pipes are vertically arranged on the tray, overflow ports are formed in the upper ends of the overflow branch pipes above the tray, and the lower ends of the overflow branch pipes are connected to an overflow main pipe below the tray;
the slurry spraying bin is internally provided with slurry, a slurry spraying layer is arranged between the lower part of the tray and the liquid level of the slurry, and the slurry spraying layer is communicated with the slurry through a pipeline and a spraying pump;
the tray spraying bin is provided with a tray spraying layer above the tray, and the tray spraying layer is communicated with the slurry in the slurry spraying bin through a pipeline and a tray circulating pump.
2. The spray tray bubbling dual-cycle desulfurization dust removal device according to claim 1, wherein: the tray spraying layer is connected with a tray circulation box through a pipeline and a tray circulation pump, slurry containing a desulfurizing agent is arranged in the tray circulation box, and a reflow opening is formed in the top of the tray circulation box and communicated with the overflow main pipe.
3. The spray tray bubbling dual-cycle desulfurization dust removal device according to claim 2, wherein: the upper part of one side of the tray circulation box is communicated with the slurry spraying bin of the absorption tower through the overflow pipe of the circulation box, and the height of the end part of the overflow pipe of the circulation box, which is positioned in the slurry spraying bin, is positioned above the liquid level of the slurry.
4. The spray tray bubbling dual-cycle desulfurization dust removal device according to claim 1, wherein: and each overflow branch pipe is provided with an adjusting head at the overflow port, and the height of the liquid holding layer can be adjusted according to the concentration requirement of the outlet pollutant.
5. The spray tray bubbling dual-cycle desulfurization dust removal device according to claim 1, wherein: and overflow pipe caps are covered and arranged above the overflow ports of the overflow branch pipes.
6. The spray tray bubbling dual-cycle desulfurization dust removal device according to claim 1, wherein: the tray is provided with tray partition boards for uniformly partitioning the tray, and at least one overflow branch pipe is arranged in each partition.
7. The spray tray bubbling dual-cycle desulfurization dust removal device according to claim 1, wherein: a demister is arranged above the tray spraying layer in the absorption tower.
8. The spray tray bubbling dual-cycle desulfurization and dust removal device according to claim 6, wherein: the inner cavity of the absorption tower, which is positioned between the lower part of the demister and the slurry, is divided into a left independent cavity and a right independent cavity by the vertical partition plate, each cavity is provided with a smoke inlet in the slurry spraying bin of the absorption tower, and each smoke inlet is provided with a flue gate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222553015.3U CN219111302U (en) | 2022-09-27 | 2022-09-27 | Spraying tray bubbling double-circulation desulfurization dust collector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222553015.3U CN219111302U (en) | 2022-09-27 | 2022-09-27 | Spraying tray bubbling double-circulation desulfurization dust collector |
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| CN202222553015.3U Active CN219111302U (en) | 2022-09-27 | 2022-09-27 | Spraying tray bubbling double-circulation desulfurization dust collector |
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