CN219519181U - Tail gas treatment device for solid polymeric ferric sulfate - Google Patents
Tail gas treatment device for solid polymeric ferric sulfate Download PDFInfo
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- CN219519181U CN219519181U CN202320316630.4U CN202320316630U CN219519181U CN 219519181 U CN219519181 U CN 219519181U CN 202320316630 U CN202320316630 U CN 202320316630U CN 219519181 U CN219519181 U CN 219519181U
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Abstract
The utility model relates to the technical field of polymeric ferric sulfate production, and discloses a solid polymeric ferric sulfate tail gas treatment device which comprises an electrostatic precipitator, a heat exchanger, a first-stage spray tower, a second-stage spray tower, a third-stage spray tower and a tail gas emission chimney, wherein the electrostatic precipitator, the heat exchanger, the first-stage spray tower, the third-stage spray tower and the tail gas emission chimney are sequentially arranged along the tail gas circulation direction, the inlet of the electrostatic precipitator is connected with a drying tower, the outlet of the electrostatic precipitator is connected with the hot fluid inlet of the heat exchanger, the hot fluid outlet of the heat exchanger is connected with the inlet of the first-stage spray tower, the cold fluid outlet of the heat exchanger is connected with the drying tower, the outlet of the first-stage spray tower is connected with the inlet of the second-stage spray tower, the outlet of the second-stage spray tower is connected with the inlet of the third-stage spray tower, and the outlet of the third-stage spray tower is connected with the tail gas emission chimney. The utility model realizes the purposes of energy saving, consumption reduction and pollution reduction, and has great significance in the field of solid polymeric ferric sulfate production.
Description
Technical Field
The utility model relates to the technical field of polymeric ferric sulfate production, in particular to a solid polymeric ferric sulfate tail gas treatment device.
Background
Polymeric ferric sulfate is an inorganic polymeric flocculant developed in recent years, and has superior performance compared with traditional ferric trichloride, aluminum sulfate and other flocculants. The polymeric ferric sulfate has the advantages of low production cost, small usage amount, wide applicable pH range, high pollutant removal rate, low residual concentration, good decoloring effect and the like, and can be widely applied to purification treatment of drinking water, industrial wastewater, municipal sewage, sludge dehydration and the like.
Polymeric ferric sulfate is sold as a product in two forms, namely, liquid polymeric ferric sulfate and solid polymeric ferric sulfate, and the production steps of solid polymeric ferric sulfate generally include:
(1) And (3) batching: mixing ferrous sulfate heptahydrate with waste acid or mixing ferrous sulfate solution with concentrated sulfuric acid to obtain mixed slurry;
(2) Oxidizing: the mixed slurry enters a reaction kettle to react with oxygen under the action of a catalyst to obtain liquid polymeric ferric sulfate;
(3) And (3) drying: and (3) the liquid polymeric ferric sulfate solution enters a drying tower, and is mixed with hot air for heat exchange to obtain solid polymeric ferric sulfate powder, namely a solid polymeric ferric sulfate product.
Wherein in the process of converting the liquid polymeric ferric sulfate solution into the solid polymeric ferric sulfate powder in the step (3), a large amount of heat is consumed, the purpose of dehydrating the liquid polymeric ferric sulfate solution is achieved by increasing the temperature of the material, and the consumption of natural gas per ton of solid polymeric ferric sulfate reaches 130-140 m 3 。
A large amount of high-temperature flue gas is generated in the drying process, and the flue gas contains fine solid polymeric ferric sulfate particles, sulfides, oxygen and other components. If the flue gas is directly discharged without treatment, the solid polymeric ferric sulfate material is lost, and meanwhile, pollutants enter the atmosphere to influence the environment; therefore, the flue gas generated by the drying tower is treated and then discharged, and the conventional flue gas treatment process mainly comprises the steps of spray cooling, impurity removal and desulfurization.
In the flue gas that the drying tower produced, particulate matter content is many, the particle size is little, if the flue gas does not obtain effective separation, the particulate matter will get into subsequent treatment process along with the tail gas, and the solid polymeric ferric sulfate granule can appear the phenomenon of absorbing moisture after meeting water, forms the great aggregate adhesion of viscosity in the tail gas pipeline, causes the tail gas pipeline flux to descend, even appears blocking up the pipeline and need the manual work to clear up the condition of dredging, and can't effectually carry out the recovery of polymeric ferric sulfate, causes solid polymeric ferric sulfate material loss. In addition, when the hot air recycling technology is used, the risk that solid polymeric ferric sulfate in tail gas enters a heat exchange device to block a pipeline is increased, and the application of the hot air recycling technology is influenced.
The flue gas temperature that the drying tower produced is high, needs to use primary water to spray the cooling to tail gas, contains polymeric ferric sulfate in the spray liquid after spraying, if not retrieve the recycle to spray liquid and will cause polymeric ferric sulfate loss.
Therefore, how to improve the gas-solid-gas separation effect of the drying tower, improve the recovery rate of solid polymeric ferric sulfate, recycle waste heat of the tail gas of the drying tower, reduce natural gas consumption, optimize the spraying mode of the tail gas, reduce primary water consumption, recycle spray water of the tail gas, reduce production cost, namely improve the recovery rate of polymeric ferric sulfate in the flue gas of the drying tower, and reduce the natural gas unit consumption of the drying tower, is a problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the utility model provides a solid polymeric ferric sulfate tail gas treatment device.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a solid polymeric ferric sulfate tail gas processing apparatus, includes electrostatic precipitator, heat exchanger, one-level spray column, second grade spray column, tertiary spray column, the tail gas emission chimney that sets gradually along the tail gas circulation direction, electrostatic precipitator's access connection has the drying tower, export and the hot fluid access connection of heat exchanger, the hot fluid export of heat exchanger and the access connection of one-level spray column, the cold fluid export and the drying tower of heat exchanger are connected, the export and the access connection of second grade spray column of one-level spray column, the export and the access connection of tertiary spray column of second grade spray column, the export and the tail gas emission chimney of tertiary spray column are connected.
The inlet of the electrostatic precipitator is connected with the tail gas outlet of the drying tower, and the outlet is connected with the heat exchanger. The tail gas of the drying tower firstly enters an electrostatic precipitator, and most of particulate matters in the tail gas are removed under the action of electrostatic dust removal, and the treated tail gas is conveyed to a heat exchanger for subsequent treatment.
The heat exchanger is used for recovering heat in the tail gas and heating air entering the polymeric ferric sulfate drying tower.
The first-stage spray tower and the second-stage spray tower are used for treating the tail gas treated by the heat exchanger, and further removing polymeric ferric sulfate particles in the tail gas and cooling.
The electrostatic precipitator is equipped with the beating groove, the beating groove is connected with electrostatic precipitator through the ground paste circulating pipe, the beating groove is equipped with the ground paste back flow.
The solid polymeric ferric sulfate particles contained in the tail gas of the drying tower are adsorbed by a dust collecting plate in the electrostatic precipitator, the lower part of the electrostatic precipitator is provided with a pulping groove, and the pulping groove is connected with a slurry circulating pipe and is used for flushing solid particles attached to the dust collecting plate in the electrostatic precipitator, and the solid particles enter the pulping groove after being flushed by circulating water in the pulping groove.
The slurry return pipe is used for conveying circulating water after flushing in the pulping tank to the feeding storage tank of the drying tower, so that flushing water containing polymeric ferric sulfate is returned to the production system, polymeric ferric sulfate in tail gas can be recycled, and production cost is saved.
The tail gas treated by the electrostatic precipitator enters a heat exchanger for further treatment, and the tail gas of the drying tower is cooled (the temperature is reduced to less than or equal to 70 ℃ from 110-130 ℃) by heat exchange with cold air.
The primary spray tower is provided with a primary circulation tank, the primary circulation tank is connected with the primary spray tower through a primary circulation pipe, a primary circulation pump is arranged on the primary circulation pipe, the primary circulation tank is connected with the pulping tank through a primary discharge pipe, and a primary discharge pump is arranged on the primary discharge pipe.
The outlet of the heat exchanger is communicated with the first-stage spray tower and is used for treating the tail gas treated by the heat exchanger and removing solid polymeric ferric sulfate particles in the tail gas. When the specific gravity of the spray liquid in the primary circulation tank is more than 1.35, the feed liquid in the primary circulation tank is discharged to the pulping tank through the primary discharge pipe by the primary discharge pump.
The secondary spray tower is provided with a secondary circulation tank, the secondary circulation tank is connected with the secondary spray tower through a secondary circulation pipe, a secondary circulation pump is arranged on the secondary circulation pipe, the secondary circulation tank is connected with the primary circulation tank through a secondary discharge pipe, and a secondary discharge pump is arranged on the secondary discharge pipe.
The outlet of the first-stage spray tower is communicated with the second-stage spray tower, and the second-stage spray tower is used for removing solid polymeric ferric sulfate particles in the tail gas. When the specific gravity of the spraying liquid in the secondary circulation tank is more than 1.20, the liquid in the secondary circulation tank is discharged to the primary circulation tank through the secondary discharge pipe by the secondary discharge pump.
The purpose of improving the concentration of the polymeric ferric sulfate in the tail gas spray liquid can be achieved by circularly spraying the spray liquid of the first-stage spray tower and the second-stage spray tower, so that the tail gas spray liquid can be recycled conveniently.
The cold fluid outlet of the heat exchanger is connected with the drying tower through a hot air exhaust pipe, a hot air induced draft fan is arranged on the hot air exhaust pipe, the outlet of the secondary spray tower is connected with the inlet of the tertiary spray tower through a tail gas exhaust pipe, and a tail gas induced draft fan is arranged on the tail gas exhaust pipe.
By adjusting the operating frequency of the hot air induced draft fan, the temperature of hot air discharged from the cold fluid outlet of the heat exchanger can be ensured to be lower than 70 ℃.
By adjusting the operation frequency of the tail gas induced draft fan, the tail gas can be ensured to be smoothly discharged.
The three-stage spray tower is connected with a three-stage circulating pool, the three-stage circulating pool is connected with the three-stage spray tower through a three-stage circulating pipe, and a three-stage circulating pump is arranged on the three-stage circulating pipe.
The three-stage circulating pool is filled with low-concentration sodium hydroxide solution. The third-stage spray tower is used for spraying the tail gas treated by the second-stage spray tower by using a low-concentration sodium hydroxide solution to remove sulfide in the tail gas.
The spray liquid of the three-stage spray tower is circularly sprayed for use, so that the consumption of sodium hydroxide solution in the tail gas desulfurization process is reduced, and the tail gas treatment cost is reduced while the tail gas desulfurization effect is ensured.
The first-stage spray tower and the second-stage spray tower are respectively connected with a spray water conveying pipeline, and the third-stage spray tower is connected with a sodium hydroxide conveying pipe.
After being sprayed by the first-stage spray tower and the second-stage spray tower, the tail gas still contains a small amount of sulfide which cannot be removed. The sodium hydroxide conveying pipe is used for conveying sodium hydroxide serving as a desulfurization absorbent of the three-stage spray tower.
The three-stage spray tower uses sodium hydroxide solution in the three-stage circulating pool to spray and desulfurize tail gas in the three-stage spray tower, the concentration of the sodium hydroxide solution is 5-8%, and when the pH value of the sodium hydroxide solution in the three-stage circulating pool is less than 7.0, the sodium hydroxide solution in the three-stage circulating pool is required to be subjected to outward displacement.
The multi-layer spray towers are respectively arranged in the first-level spray tower, the second-level spray tower and the third-level spray tower, and each layer of spray pipe is provided with a plurality of spray heads.
During operation, tail gas produced by the drying tower enters the electrostatic precipitator to carry out solid-gas separation, and solid particles attached to the electrostatic precipitator after separation enter the pulping tank to return to the production system after being washed by circulating water in the pulping tank; the tail gas treated by the electrostatic dust collector enters a heat exchanger, exchanges heat with cold air, enters a first-stage spray tower, and enters a drying tower after absorbing heat, so that the temperature of the air entering the drying tower is increased by the arrangement, and the unit consumption of natural gas and the temperature of the tail gas discharged are reduced; a first-stage circulating pool is arranged at the lower part of the first-stage spray tower, and spray water in the first-stage circulating pool is utilized to spray and cool the tail gas entering the first-stage spray tower; when the specific gravity of the spray liquid in the primary circulation tank is more than 1.35, the feed liquid in the primary circulation tank is discharged to the pulping tank through the primary discharge pipe by the primary discharge pump; the tail gas treated by the first-stage spray tower enters a second-stage spray tower, and spray water in a second-stage circulating pool at the lower part of the second-stage spray tower is used for carrying out spray cooling on the tail gas in the second-stage spray tower; when the specific gravity of the spraying liquid in the secondary circulation tank is more than 1.20, the material liquid in the secondary circulation tank is required to be discharged to the primary circulation tank through a secondary discharge pipe by a secondary discharge pump; the tail gas treated by the secondary spray tower enters a tertiary spray tower, sodium hydroxide solution in a tertiary circulating pool at the lower part of the tertiary spray tower is utilized to spray and desulfurize the tail gas in the tertiary spray tower, and when the pH value of the sodium hydroxide solution in the tertiary circulating pool is less than 7.0, the tail gas is required to be discharged and replaced; and the tail gas treated by the three-stage spray tower enters a tail gas discharge chimney to be discharged to the atmosphere.
The utility model also comprises other components which can enable the solid polymeric ferric sulfate tail gas treatment device to be normally used, and the components are all conventional technical means in the field. In addition, the devices or components not defined in the present utility model are all conventional in the art.
Compared with the prior art, the utility model has the following beneficial effects:
1) The tail gas of the drying tower is subjected to solid-gas separation through an electrostatic precipitator, and the primarily purified high-temperature tail gas is introduced into a heat exchanger for heating air, so that the temperature of the air entering the drying tower is increased, and the unit consumption of natural gas is reduced;
2) After the tail gas of the drying tower is subjected to solid-gas separation through the electrostatic precipitator, the risk that solid polymeric ferric sulfate particles absorb moisture when meeting water and form agglomerates with high viscosity to block a heat exchanger pipeline is reduced;
3) The washing water of the electrostatic precipitator, the spray water of the first-stage spray tower and the spray water of the second-stage spray tower are recycled, the tail gas temperature of the drying tower is reduced after the tail gas is treated by the heat exchanger, the water consumption is reduced, the water resource is saved, and the concentration of the polymeric ferric sulfate in the spray water is improved;
4) The method comprises the steps of firstly recycling polymeric ferric sulfate through a first-stage spray tower and a second-stage spray tower, then desulfurizing through a third-stage spray tower by using sodium hydroxide solution, absorbing sulfur dioxide in tail gas, and recycling polymeric ferric sulfate while ensuring that the sulfur dioxide content of the tail gas reaches the emission standard index requirement.
The utility model realizes the purposes of energy saving, consumption reduction and pollution reduction, and has great significance in the field of solid polymeric ferric sulfate production.
Drawings
Fig. 1 is a schematic structural view of the present embodiment.
In the figure: 1. a drying tower; 2. an electrostatic precipitator; 3. a pulping groove; 4. a slurry return pipe; 5. a hot air induced draft fan; 6. a heat exchanger; 7. a first-stage spray tower; 8. a first-stage discharge pump; 9. a primary circulation tank; 10. a primary circulation pump; 11. a secondary spray tower; 12. a secondary discharge pump; 13. a secondary circulation tank; 14. a secondary circulation pump; 15. a tail gas induced draft fan; 16. a third-stage spray tower; 17. a third-stage circulating pool; 18. a three-stage circulating pump; 19. and (5) discharging tail gas into a chimney.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Examples
Referring to fig. 1, a solid polymeric ferric sulfate tail gas treatment device comprises an electrostatic precipitator 2, a heat exchanger 6, a first-stage spray tower 7, a second-stage spray tower 11, a third-stage spray tower 16 and a tail gas emission chimney 19 which are sequentially arranged along the tail gas circulation direction, wherein an inlet of the electrostatic precipitator 2 is connected with a drying tower 1, an outlet of the electrostatic precipitator is connected with a hot fluid inlet of the heat exchanger 6, a hot fluid outlet of the heat exchanger 6 is connected with an inlet of the first-stage spray tower 7, a cold fluid outlet of the heat exchanger 6 is connected with the drying tower 1, an outlet of the first-stage spray tower 7 is connected with an inlet of the second-stage spray tower 11, an outlet of the second-stage spray tower 11 is connected with an inlet of the third-stage spray tower 16, and an outlet of the third-stage spray tower 16 is connected with the tail gas emission chimney 19.
The inlet of the electrostatic precipitator 2 is connected with the tail gas outlet of the drying tower 1, and the outlet is connected with the heat exchanger 6. The tail gas of the drying tower 1 firstly enters the electrostatic precipitator 2, most of particulate matters in the tail gas are removed under the action of electrostatic precipitation, and the treated tail gas is conveyed to the heat exchanger 6 for subsequent treatment.
The heat exchanger 6 is used for recovering heat in the tail gas and heating air entering the polymeric ferric sulfate drying tower 1. The heat exchanger 6 comprises a shell and a heat exchange tube arranged in the shell, wherein the heat exchange tube is a serpentine coil, one end of the heat exchange tube is a hot fluid inlet and is connected with an outlet of the electrostatic precipitator 2, the other end of the heat exchange tube is a hot fluid outlet and is connected with an inlet of the primary spray tower 7, one side of the shell is provided with a cold fluid inlet, air horizontally enters the shell through the cold fluid inlet, and the cold fluid outlet is positioned at the other side of the shell. The shell and the heat exchange tube are made of stainless steel, and a heat insulation layer is arranged outside the shell.
The first-stage spray tower 7 and the second-stage spray tower 11 are used for treating the tail gas treated by the heat exchanger 6, and further removing polymeric ferric sulfate particles in the tail gas and cooling.
The electrostatic precipitator 2 is equipped with beating groove 3, beating groove 3 passes through the ground paste circulating pipe and is connected with electrostatic precipitator 2, beating groove 3 is equipped with ground paste back flow 4.
The solid polymeric ferric sulfate particles contained in the tail gas of the drying tower are adsorbed by a dust collecting plate in the electrostatic precipitator 2, the high temperature resistance of the electrostatic precipitator 2 is realized, the lower part of the electrostatic precipitator 2 is provided with a pulping groove 3, and the pulping groove 3 is connected with a slurry circulating pipe for flushing solid particles attached to the dust collecting plate in the electrostatic precipitator 2, and the solid particles enter the pulping groove 3 after being flushed by circulating water in the pulping groove 3.
The slurry return pipe is used for conveying the circulating water washed in the pulping tank 3 to the feeding storage tank of the drying tower, so that the washing water containing the polymeric ferric sulfate is returned to the production system, the polymeric ferric sulfate in the tail gas can be recycled, and the production cost is saved.
The tail gas treated by the electrostatic precipitator 2 enters a heat exchanger 6 for further treatment, and the tail gas of the drying tower 1 is cooled (the temperature is reduced to less than or equal to 70 ℃ from 110-130 ℃) by heat exchange with cold air.
The primary spray tower 7 is provided with a primary circulation tank 9, the primary circulation tank 9 is connected with the primary spray tower 7 through a primary circulation pipe, a primary circulation pump 10 is arranged on the primary circulation pipe, the primary circulation tank 9 is connected with the pulping tank 3 through a primary discharge pipe, and a primary discharge pump 8 is arranged on the primary discharge pipe.
The outlet of the heat exchanger 6 is communicated with the first-stage spray tower 7 and is used for treating the tail gas treated by the heat exchanger 6 and removing solid polymeric ferric sulfate particles in the tail gas. When the specific gravity of the spray liquid in the primary circulation tank 9 is more than 1.35, the feed liquid in the primary circulation tank 9 is discharged to the pulping tank 3 through a primary discharge pipe by a primary discharge pump 8.
The secondary spray tower 11 is provided with a secondary circulation tank 13, the secondary circulation tank 13 is connected with the secondary spray tower 11 through a secondary circulation pipe, a secondary circulation pump 14 is arranged on the secondary circulation pipe, the secondary circulation tank 13 is connected with the primary circulation tank 9 through a secondary discharge pipe, and a secondary discharge pump 12 is arranged on the secondary discharge pipe.
The outlet of the first-stage spray tower 7 is communicated with a second-stage spray tower 11, and the second-stage spray tower 11 is used for removing solid polymeric ferric sulfate particles in tail gas. When the specific gravity of the spraying liquid in the secondary circulation tank 13 is more than 1.20, the liquid in the secondary circulation tank 13 is required to be discharged to the primary circulation tank 9 through the secondary discharge pipe by the secondary discharge pump 12.
The purpose of improving the concentration of the polymeric ferric sulfate in the tail gas spray liquid can be achieved by circularly spraying the spray liquid of the first-stage spray tower 7 and the second-stage spray tower 11, so that the tail gas spray liquid can be recycled conveniently.
The cold fluid outlet of the heat exchanger 6 is connected with the drying tower 1 through a hot air exhaust pipe, a hot air induced draft fan 5 is arranged on the hot air exhaust pipe, the outlet of the secondary spray tower 11 is connected with the inlet of the tertiary spray tower 16 through a tail gas exhaust pipe, and a tail gas induced draft fan 15 is arranged on the tail gas exhaust pipe.
By adjusting the operating frequency of the hot air induced draft fan 5, the temperature of hot air discharged from the cold fluid outlet of the heat exchanger can be ensured to be lower than 70 ℃.
By adjusting the operating frequency of the exhaust gas induced draft fan 15, smooth exhaust of the exhaust gas can be ensured.
The three-stage spray tower 16 is connected with a three-stage circulating pool 17, the three-stage circulating pool 17 is connected with the three-stage spray tower 16 through a three-stage circulating pipe, and a three-stage circulating pump 18 is arranged on the three-stage circulating pipe.
The three-stage circulating pool 17 is filled with a low-concentration sodium hydroxide solution. The third-stage spray tower 16 is used for spraying the tail gas treated by the second-stage spray tower 11 by using a low-concentration sodium hydroxide solution to remove sulfide in the tail gas.
By circularly spraying the spray liquid of the three-stage spray tower 16, the consumption of sodium hydroxide solution in the tail gas desulfurization process is reduced, and the tail gas treatment cost is reduced while the tail gas desulfurization effect is ensured.
The first-stage spray tower 7 and the second-stage spray tower 11 are respectively connected with a spray water conveying pipeline, and the third-stage spray tower 16 is connected with a sodium hydroxide conveying pipe.
After being sprayed by the first-stage spray tower 7 and the second-stage spray tower 11, a small amount of sulfide still contained in the tail gas can not be removed. The sodium hydroxide delivery pipe is used to deliver the desulfurization absorbent sodium hydroxide of the tertiary spray tower 16.
The three-stage spray tower 16 uses sodium hydroxide solution in the three-stage circulating pool 17 to spray and desulfurize tail gas in the three-stage spray tower 16, the concentration of the sodium hydroxide solution is 5-8%, and when the pH value of the sodium hydroxide solution in the three-stage circulating pool 17 is less than 7.0, the sodium hydroxide solution in the three-stage circulating pool 17 needs to be subjected to discharge replacement.
The primary spray tower 7, the secondary spray tower 11 and the tertiary spray tower 16 are respectively provided with a plurality of layers of spray pipes, and each layer of spray pipes is provided with a plurality of spray heads.
In the embodiment, three layers of spray pipes are arranged in the first-stage spray tower 7, the second-stage spray tower 11 and the third-stage spray tower 16, 12 spray heads are arranged on each layer of spray pipe, and the spray heads are spiral spray heads.
During operation, tail gas produced by the drying tower 1 enters the electrostatic precipitator 2 for solid-gas separation, and solid particles attached to the electrostatic precipitator 2 after separation enter the pulping tank 3 after being washed by circulating water in the pulping tank 3 and return to the production system; the tail gas treated by the electrostatic precipitator 2 enters the heat exchanger 6, exchanges heat with cold air and enters the first-stage spray tower 7, and the cold air absorbs heat and enters the drying tower 1; a first-stage circulating pool 9 is arranged at the lower part of the first-stage spray tower 7, and spray water in the first-stage circulating pool 9 is utilized to spray and cool the tail gas entering the first-stage spray tower 7; when the specific gravity of the spray liquid in the primary circulation tank 9 is more than 1.35, the feed liquid in the primary circulation tank 9 is required to be discharged to the pulping tank 3 through a primary discharge pipe by a primary discharge pump 8; the tail gas treated by the first-stage spray tower 7 enters a second-stage spray tower 11, and spray water in a second-stage circulating pool at the lower part of the second-stage spray tower 11 is used for carrying out spray cooling on the tail gas in the second-stage spray tower 11; when the specific gravity of the spraying liquid in the secondary circulation tank 13 is more than 1.20, the material liquid in the secondary circulation tank 13 is required to be discharged to the primary circulation tank 9 through a secondary discharge pipe by a secondary discharge pump 12; the tail gas treated by the secondary spray tower 11 enters a tertiary spray tower 16, sodium hydroxide solution in a tertiary circulation tank 17 at the lower part of the tertiary spray tower 16 is utilized to spray and desulfurize the tail gas in the tertiary spray tower 16, and when the pH value of the sodium hydroxide solution in the tertiary circulation tank 17 is less than 7.0, the tail gas is required to be discharged for replacement; the tail gas treated by the three-stage spray tower 16 enters a tail gas discharge chimney 19 to be discharged to the atmosphere.
According to the utility model, a waste heat utilization technology is used, and the primarily purified high-temperature tail gas is introduced into the heat exchanger 6 for heating air, so that the temperature of the air entering the drying tower is increased, and the unit consumption of natural gas is reduced; after the tail gas of the drying tower is subjected to solid-gas separation through the electrostatic precipitator 2, the risk that solid polymeric ferric sulfate particles absorb moisture when meeting water and form agglomerates with high viscosity to block a pipeline of the heat exchanger 6 is reduced; the tail gas temperature of the drying tower 1 is reduced after the tail gas is treated by the heat exchanger 6, so that the flushing water of the electrostatic precipitator 2 and the spray water of the primary and secondary spray towers 11 are recycled, the water consumption of the spray water of the primary and secondary spray towers 11 is reduced, the water resource is saved, and the concentration of polymeric ferric sulfate in the spray water is improved; the three-stage spray tower 16 uses sodium hydroxide solution for desulfurization, absorbs sulfur dioxide in the tail gas, and ensures that the sulfur dioxide content of the tail gas meets the emission standard index requirement.
The embodiments of the present utility model have been described above, the description is illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (8)
1. A solid polymeric ferric sulfate tail gas treatment device is characterized in that: including electrostatic precipitator, heat exchanger, one-level spray column, second grade spray column, tertiary spray column, the exhaust emission chimney that sets gradually along the tail gas circulation direction, electrostatic precipitator's access connection has the drying column, and the export is with the hot fluid access connection of heat exchanger, the hot fluid export of heat exchanger is connected with the access connection of one-level spray column, the cold fluid export of heat exchanger is connected with the drying column, the export of one-level spray column and the access connection of second grade spray column, the export of second grade spray column and the access connection of tertiary spray column, the export and the exhaust emission chimney of tertiary spray column are connected.
2. The solid polymeric ferric sulfate tail gas treatment device according to claim 1, wherein: the electrostatic precipitator is equipped with the beating groove, the beating groove is connected with electrostatic precipitator through the ground paste circulating pipe, the beating groove is equipped with the ground paste back flow.
3. The solid polymeric ferric sulfate tail gas treatment device according to claim 1, wherein: the primary spray tower is provided with a primary circulation tank, the primary circulation tank is connected with the primary spray tower through a primary circulation pipe, a primary circulation pump is arranged on the primary circulation pipe, the primary circulation tank is connected with the pulping tank through a primary discharge pipe, and a primary discharge pump is arranged on the primary discharge pipe.
4. A solid polymeric ferric sulfate tail gas treatment device as claimed in claim 3, wherein: the secondary spray tower is provided with a secondary circulation tank, the secondary circulation tank is connected with the secondary spray tower through a secondary circulation pipe, a secondary circulation pump is arranged on the secondary circulation pipe, the secondary circulation tank is connected with the primary circulation tank through a secondary discharge pipe, and a secondary discharge pump is arranged on the secondary discharge pipe.
5. The solid polymeric ferric sulfate tail gas treatment device according to claim 1, wherein: the cold fluid outlet of the heat exchanger is connected with the drying tower through a hot air exhaust pipe, a hot air induced draft fan is arranged on the hot air exhaust pipe, the outlet of the secondary spray tower is connected with the inlet of the tertiary spray tower through a tail gas exhaust pipe, and a tail gas induced draft fan is arranged on the tail gas exhaust pipe.
6. The solid polymeric ferric sulfate tail gas treatment device according to claim 1, wherein: the three-stage spray tower is connected with a three-stage circulating pool, the three-stage circulating pool is connected with the three-stage spray tower through a three-stage circulating pipe, and a three-stage circulating pump is arranged on the three-stage circulating pipe.
7. The solid polymeric ferric sulfate tail gas treatment device according to claim 1, wherein: the first-stage spray tower and the second-stage spray tower are respectively connected with a spray water conveying pipeline, and the third-stage spray tower is connected with a sodium hydroxide conveying pipe.
8. The solid polymeric ferric sulfate tail gas treatment device according to claim 1, wherein: the multi-layer spray towers are respectively arranged in the first-level spray tower, the second-level spray tower and the third-level spray tower, and each layer of spray pipe is provided with a plurality of spray heads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320316630.4U CN219519181U (en) | 2023-02-24 | 2023-02-24 | Tail gas treatment device for solid polymeric ferric sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320316630.4U CN219519181U (en) | 2023-02-24 | 2023-02-24 | Tail gas treatment device for solid polymeric ferric sulfate |
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| CN219519181U true CN219519181U (en) | 2023-08-15 |
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| CN202320316630.4U Active CN219519181U (en) | 2023-02-24 | 2023-02-24 | Tail gas treatment device for solid polymeric ferric sulfate |
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| CN (1) | CN219519181U (en) |
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- 2023-02-24 CN CN202320316630.4U patent/CN219519181U/en active Active
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