CN113058400A - Powder drying tail gas absorption system - Google Patents
Powder drying tail gas absorption system Download PDFInfo
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- CN113058400A CN113058400A CN202110307326.9A CN202110307326A CN113058400A CN 113058400 A CN113058400 A CN 113058400A CN 202110307326 A CN202110307326 A CN 202110307326A CN 113058400 A CN113058400 A CN 113058400A
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- 239000000843 powder Substances 0.000 title claims abstract description 30
- 238000001035 drying Methods 0.000 title claims abstract description 18
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 146
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000011552 falling film Substances 0.000 claims abstract description 44
- 239000010439 graphite Substances 0.000 claims abstract description 44
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 44
- 239000006096 absorbing agent Substances 0.000 claims abstract description 43
- 239000000428 dust Substances 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 63
- 239000003513 alkali Substances 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 11
- 239000012670 alkaline solution Substances 0.000 claims description 8
- 230000001174 ascending effect Effects 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 5
- 238000006115 defluorination reaction Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 81
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract description 14
- 239000010436 fluorite Substances 0.000 abstract description 14
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 9
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 abstract description 8
- 230000003203 everyday effect Effects 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 4
- 235000010265 sodium sulphite Nutrition 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 239000008399 tap water Substances 0.000 abstract description 2
- 235000020679 tap water Nutrition 0.000 abstract description 2
- 239000003034 coal gas Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/12—Washers with plural different washing sections
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a powder drying tail gas absorption system which comprises a circulating groove, a graphite falling film absorber, a circulating pump, a water washing tower, a water washing pump, an alkaline washing tower, an alkaline washing pump and a tail gas fan, and is applied to a powder drying system, fluorite powder and water vapor in vent gas are fully recovered, calculated according to 200 tons of wet fluorite powder dried every day, about 0.1 ton of fluorite powder recovered every day and about 20 tons of recovered water are obtained, sulfurous acid or sodium sulfite generated by a recovery system enters a hydrofluosilicic acid alkaline washing system, the use amount of sodium sulfite in an emergency geosyncline of an F113a production device and the use amount of tap water of a slag gas recovery system are reduced, meanwhile, the contents of sulfur dioxide, smoke dust and nitrogen oxides in tail gas are obviously reduced, and the problem of atmospheric pollution is.
Description
Technical Field
The invention belongs to the technical field of chemical tail gas treatment, and particularly relates to a powder drying tail gas absorption system.
Background
At present, the production of hydrogen fluoride in China is mainly based on a fluorite-sulfuric acid route. The existing wet fluorite powder has a 100-mesh passing rate of about 80 percent and a water content of about 10 percent. Wet fluorite powder is uniformly fed into a powder drying converter through a chain plate conveyor, the wet fluorite powder is gradually moved backwards through the turning of a shoveling plate in the powder drying converter and is in countercurrent contact with hot gas generated by the combustion of coal gas from the tail of the converter, the combustion tail gas generated in the drying process is pumped by a tail gas fan and is discharged to a pulse bag type dust collector through a furnace end, the fluorite powder carried by the hot gas is recovered, and the purified tail gas carrying trace fluorite powder is discharged from the upper air of 25 meters. When the cloth bag of the pulse bag type dust collector cannot be replaced in time, the content of dust in the exhausted tail gas exceeds the standard, most of the tail gas is water vapor, and resources are wasted. The coal gas is made of anthracite, because the anthracite contains a certain amount of sulfide, sulfur dioxide, nitrogen oxide and other gases can be generated in the coal gas combustion process, and meanwhile, the fluorite powder is made by adopting a flotation method, so that the exhausted gas contains trace acid gas and pollutes the environment. Therefore, a novel powder drying tail gas absorption system is urgently needed at present to solve the existing problems.
Disclosure of Invention
The invention aims to provide a powder drying tail gas absorption system, which adopts graphite falling film absorption, water washing and alkali washing to recycle fluorite powder dust, water vapor, sulfur dioxide and the like generated by a drying system, fully recycles the fluorite powder and the water vapor in the vented gas, enables the tail gas to reach the standard and be evacuated, saves energy and effectively solves the problem of environmental pollution.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a powder drying tail gas absorption system comprises a circulating tank, a graphite falling film absorber, a circulating pump, a water washing tower, a water washing pump, an alkali washing tower, an alkali washing pump and a tail gas fan, wherein the bottom of the graphite falling film absorber is connected with the circulating tank, an outlet pipeline is arranged at the bottom of the circulating tank and is connected with the circulating pump, and the other side of the circulating pump is connected with a slag removing gas washing tower; the top of the graphite falling film absorber is connected with a gas phase outlet of the dust remover, the bottom of the circulating tank is connected with the top of the graphite falling film absorber through a circulating pump, and the top is directly connected with the bottom of the graphite falling film absorber; the bottom of the graphite falling film absorber is connected with a gas phase inlet pipeline arranged at the bottom of the washing tower through a gas phase outlet pipeline, the bottom of the washing tower is connected with a washing pump through a bottom liquid outlet pipeline, one end of the washing pump is connected with the top of the washing tower, the other end of the bottom of the washing tower is connected with a circulating tank through an overflow pipe, and the top of the washing tower is connected with the gas phase inlet pipeline at the bottom of the alkaline washing tower through the gas phase outlet pipeline; the device comprises an alkali washing tower, a tail gas fan, a tail gas inlet pipeline, a tail gas outlet pipeline, an alkali washing pump, a tail gas outlet pipeline, a tail gas inlet pipeline, a tail gas outlet pipeline, a tail gas inlet pipeline, a tail gas; one end of the alkaline washing pump is connected with the bottom of the alkaline washing tower, and the other end of the alkaline washing pump is connected with the top of the alkaline washing tower and the defluorination acid washing tower respectively.
Furthermore, the circulating tank is provided with a liquid level meter, an outlet pipeline between the circulating pump and the deslagging gas washing tower is provided with a liquid level regulating valve, and the liquid level meter is matched with the liquid level regulating valve to control the liquid level of the circulating tank to be stable.
Furthermore, a liquid level meter is arranged at the bottom of the alkaline washing tower, and a liquid level regulating valve is arranged on a pipeline between the alkaline washing tower and the alkaline washing pump to control the bottom liquid level of the alkaline washing tower to be stable.
Furthermore, the graphite falling film absorber is cooled by circulating water, a circulating water inlet is formed in the bottom of the shell, and a circulating water return port is formed in the top of the shell.
When the device works, a part of circulating liquid in the circulating groove is pumped to the top of the graphite falling film absorber through the circulating pump, hot air at a gas phase outlet of the dust remover enters through the top of the graphite falling film absorber, the hot air is primarily absorbed by the circulating liquid, the hot air and the hot air are cooled by the graphite falling film absorber and then automatically flow to the circulating groove from the bottom of the graphite falling film absorber, and unabsorbed hot air enters a gas phase inlet pipeline at the bottom of the water washing tower from a gas phase outlet pipeline at the bottom of the graphite falling film absorber; the circulating tank is provided with a liquid level meter, part of circulating liquid in the circulating tank is pumped to the deslagging gas washing tower through the circulating pump, an outlet pipeline between the circulating pump and the deslagging gas washing tower is provided with a liquid level regulating valve to control the liquid level of the circulating tank to be stable, water washing liquid at the bottom of the washing tower is pumped to the top of the washing tower through the water washing pump at the bottom, a washing tower section is provided with plastic fillers, spraying water washing liquid at the top is in countercurrent contact with ascending gas which is not recovered at the bottom of the tower, the water washing liquid is in full contact with the gas at the packing layer, the water washing liquid at the bottom of the washing tower enters the circulating tank through an overflow pipe, and the unabsorbed gas enters a gas phase inlet pipeline at the; the alkali liquor of the alkaline tower is supplemented through the tower top, part of alkaline solution at the tower bottom is pumped to the top of the alkaline tower through an alkaline washing pump, plastic filler is installed on a tower section of the alkaline tower, the sprayed alkaline solution at the top is in countercurrent contact with ascending gas which is not recovered at the tower bottom, the alkaline solution is in full contact with the gas at a filler layer, a liquid level meter is installed at the bottom of the alkaline tower, part of the alkaline solution at the bottom of the alkaline tower is pumped to a fluosilicic acid removing alkaline tower through the alkaline washing pump, a liquid level regulating valve is arranged between the alkaline tower and the alkaline washing pump through a pipeline, the bottom liquid level of the alkaline tower is controlled to be stable, and the gas which is not absorbed by the alkaline tower is discharged into the atmosphere through a tail gas fan from a.
The invention has the following beneficial effects:
1. the invention is applied to a powder drying system, fluorite powder and water vapor in the exhausted air are fully recovered, calculated according to 200 tons of wet fluorite powder dried every day, about 0.1 ton of fluorite powder is recovered every day, about 20 tons of water is recovered, sulfurous acid or sodium sulfite generated by the recovery system enters a fluosilicic acid alkali washing system, the use amount of sodium sulfite in an emergency geosyncline of an F113a production device and the use amount of tap water of a slag gas recovery system are reduced, meanwhile, the contents of sulfur dioxide, smoke dust and nitrogen oxide in tail gas are obviously reduced, and the problem of atmospheric pollution is solved.
2. The water washing tower and the alkali washing tower adopt the overflow pipe to control the liquid level in the tower to be stable, thereby reducing the number of washing tanks, simultaneously reducing the occupied space of equipment and reducing the leakage point of the equipment.
3. Thermometers are arranged on a water washing pump, an alkaline washing pump, a circulating pump outlet pipeline, a graphite falling film absorber, a water washing tower and an alkaline washing tower gas phase pipeline, so that the tail gas absorption condition and the blockage condition of a filler in the tower can be known in time.
4. The water washing tower, the alkaline washing tower and the auxiliary pipelines are made of PP materials, the middle tower sections of the water washing tower and the alkaline washing tower are provided with the fillers, and the filler layer is provided with the observation holes, so that the reaction condition and the filler blockage condition in the tower can be known in time.
5. Liquid is easy to accumulate at the elbow of the gas-phase inlet pipeline of the alkaline washing tower, an overflow pipeline is arranged at the elbow, and the liquid accumulated by the elbow overflows to the alkaline washing tower, so that the phenomenon that the accumulated liquid is too much and the pipeline is corroded is prevented.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
the device comprises a circulation tank 1, a graphite falling film absorber 2, a circulation pump 3, a water washing tower 4, a water washing pump 5, an alkaline washing tower 6, an alkaline washing pump 7 and a tail gas fan 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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.
In the description of the present invention, it is to be understood that the terms "upper," "middle," "outer," "inner," "around," and the positional relationships are used merely for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1, a powder drying tail gas absorption system comprises a circulation tank 1, a graphite falling film absorber 2, a circulation pump 3, a water washing tower 4, a water washing pump 5, an alkali washing tower 6, an alkali washing pump 7 and a tail gas fan 8, wherein the bottom of the graphite falling film absorber 2 is connected with the circulation tank 1, the bottom of the circulation tank 1 is provided with an outlet pipeline connected with the circulation pump 3, and the other side of the circulation pump 3 is connected with a slag gas removal water washing tower; the top of the graphite falling film absorber 2 is connected with a gas phase outlet of the dust remover, the bottom of the circulating groove 1 is connected with the top of the graphite falling film absorber 2 through a circulating pump 3, and the top is directly connected with the bottom of the graphite falling film absorber 2; the bottom of the graphite falling film absorber 2 is connected with a gas phase inlet pipeline arranged at the bottom of the water washing tower 4 through a gas phase outlet pipeline, the bottom of the water washing tower 4 is connected with a water washing pump 5 through a bottom liquid outlet pipeline, one end of the water washing pump 5 is connected with the top of the water washing tower 4, the other end of the bottom of the water washing tower 4 is connected with the circulating tank 3 through an overflow pipe, and the top of the water washing tower 4 is connected with a gas phase inlet pipeline at the bottom of the alkaline washing tower 6 through a gas phase outlet pipeline; the device comprises an alkali washing tower 6, an alkali washing pump 7, a tail gas fan 8, a gas phase outlet pipeline, a tail gas pipeline and a tail gas pipeline, wherein alkali liquor is supplemented into the alkali washing tower 6 through the top pipeline, the bottom of the alkali washing tower 6 is connected with the alkali washing pump 7 through the bottom liquid outlet pipeline, the other end of the alkali washing pump 7 is connected with the top of the; one end of the alkaline washing pump 7 is connected with the bottom of the alkaline washing tower 6, and the other end of the alkaline washing pump is connected with the top of the alkaline washing tower 6 and the defluorination acid alkaline washing tower respectively.
The graphite falling film absorber 2 is cooled by circulating water, a circulating water inlet is formed in the bottom of a shell of the graphite falling film absorber, and a circulating water return port is formed in the top of the shell of the graphite falling film absorber.
When the device works, a part of circulating liquid in the circulating tank 1 is pumped to the top of the graphite falling film absorber 2 through the circulating pump 3, hot air at a gas phase outlet of the dust remover enters through the top of the graphite falling film absorber 2, the hot air is primarily absorbed by the circulating liquid, the hot air and the hot air are cooled by the graphite falling film absorber 2 and then automatically flow to the circulating tank 1 from the bottom of the graphite falling film absorber 2, and unabsorbed hot air enters a gas phase inlet pipeline at the bottom of the water washing tower 4 from a gas phase outlet pipeline at the bottom of the graphite falling film absorber 2; the circulating tank 1 is provided with a liquid level meter, a part of circulating liquid in the circulating tank 1 is pumped to the deslagging gas washing tower through the circulating pump 3, a liquid level regulating valve is arranged on an outlet pipeline between the circulating pump 3 and the deslagging gas washing tower to control the liquid level of the circulating tank 1 to be stable, water washing liquid at the bottom of the washing tower 4 is pumped to the top of the washing tower 4 through the bottom of the washing tower 4 through the water washing pump 5, plastic fillers are arranged on the tower section of the washing tower 4, spraying water washing liquid at the top of the washing tower is in countercurrent contact with ascending gas which is not recovered at the bottom of the tower, the water washing liquid is in full contact with the gas in the packing layer, the water washing liquid at the bottom of the washing tower 4 enters the circulating tank 1 through an overflow pipe, and the unabsorbed gas enters; the alkali liquor of the alkaline tower 6 is supplemented through the tower top, part of alkaline liquor at the tower bottom is pumped to the top of the alkaline tower 6 through an alkaline washing pump 7, plastic packing is installed on a tower section of the alkaline tower 6, the sprayed alkaline liquor at the top is in countercurrent contact with the ascending gas which is not recovered at the tower bottom, the alkaline liquor is in full contact with the gas at the packing layer, a liquid level meter is installed at the bottom of the alkaline tower 6, part of the alkaline liquor at the bottom of the alkaline tower 6 is pumped to the hydrofluosilicic acid alkaline tower through the alkaline washing pump 7, a liquid level regulating valve is arranged between the alkaline tower 6 and the alkaline washing pump 7 through a pipeline, the bottom liquid level of the alkaline tower 6 is controlled to be stable, and the gas which is not absorbed by the alkaline tower 6 is discharged into the atmosphere through a tail gas fan 8.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The utility model provides a dry by fire whitewashed tail gas absorption system which characterized in that: the system comprises a circulating tank, a graphite falling film absorber, a circulating pump, a water washing tower, a water washing pump, an alkali washing tower, an alkali washing pump and a tail gas fan, wherein the bottom of the graphite falling film absorber is connected with the circulating tank, an outlet pipeline is arranged at the bottom of the circulating tank and connected with the circulating pump, and the other side of the circulating pump is connected with a deslagging gas washing tower; the top of the graphite falling film absorber is connected with a gas phase outlet of the dust remover, the bottom of the circulating tank is connected with the top of the graphite falling film absorber through a circulating pump, and the top is directly connected with the bottom of the graphite falling film absorber; the bottom of the graphite falling film absorber is connected with a gas phase inlet pipeline arranged at the bottom of the washing tower through a gas phase outlet pipeline, the bottom of the washing tower is connected with a washing pump through a bottom liquid outlet pipeline, one end of the washing pump is connected with the top of the washing tower, the other end of the bottom of the washing tower is connected with a circulating tank through an overflow pipe, and the top of the washing tower is connected with the gas phase inlet pipeline at the bottom of the alkaline washing tower through the gas phase outlet pipeline; the device comprises an alkali washing tower, a tail gas fan, a tail gas inlet pipeline, a tail gas outlet pipeline, an alkali washing pump, a tail gas outlet pipeline, a tail gas inlet pipeline, a tail gas outlet pipeline, a tail gas inlet pipeline, a tail gas; one end of the alkaline washing pump is connected with the bottom of the alkaline washing tower, and the other end of the alkaline washing pump is connected with the top of the alkaline washing tower and the defluorination acid washing tower respectively.
2. The powder drying tail gas absorption system according to claim 1, characterized in that: the circulation tank is provided with a liquid level meter, an outlet pipeline between the circulating pump and the deslagging gas washing tower is provided with a liquid level regulating valve, the liquid level meter is matched with the liquid level regulating valve, and the liquid level of the circulation tank is controlled to be stable.
3. The powder drying tail gas absorption system according to claim 1, characterized in that: the liquid level meter is arranged at the bottom of the alkaline washing tower, and the liquid level regulating valve is arranged on a pipeline between the alkaline washing tower and the alkaline washing pump to control the bottom liquid level of the alkaline washing tower to be stable.
4. The powder drying tail gas absorption system according to claim 1, characterized in that: the graphite falling film absorber is cooled by circulating water, a circulating water inlet is formed in the bottom of a shell of the graphite falling film absorber, and a circulating water return port is formed in the top of the shell of the graphite falling film absorber.
5. The powder drying tail gas absorption system according to any one of claims 1 to 4, characterized in that: when the device works, a part of circulating liquid in the circulating groove is pumped to the top of the graphite falling film absorber through the circulating pump, hot air at a gas phase outlet of the dust remover enters through the top of the graphite falling film absorber, the hot air is primarily absorbed by the circulating liquid, the hot air and the hot air are cooled by the graphite falling film absorber and then automatically flow to the circulating groove from the bottom of the graphite falling film absorber, and unabsorbed hot air enters a gas phase inlet pipeline at the bottom of the water washing tower from a gas phase outlet pipeline at the bottom of the graphite falling film absorber; the circulating tank is provided with a liquid level meter, part of circulating liquid in the circulating tank is pumped to the deslagging gas washing tower through the circulating pump, an outlet pipeline between the circulating pump and the deslagging gas washing tower is provided with a liquid level regulating valve to control the liquid level of the circulating tank to be stable, water washing liquid at the bottom of the washing tower is pumped to the top of the washing tower through the water washing pump at the bottom, a washing tower section is provided with plastic fillers, spraying water washing liquid at the top is in countercurrent contact with ascending gas which is not recovered at the bottom of the tower, the water washing liquid is in full contact with the gas at the packing layer, the water washing liquid at the bottom of the washing tower enters the circulating tank through an overflow pipe, and the unabsorbed gas enters a gas phase inlet pipeline at the; the alkali liquor of the alkaline tower is supplemented through the tower top, part of alkaline solution at the tower bottom is pumped to the top of the alkaline tower through an alkaline washing pump, plastic filler is installed on a tower section of the alkaline tower, the sprayed alkaline solution at the top is in countercurrent contact with ascending gas which is not recovered at the tower bottom, the alkaline solution is in full contact with the gas at a filler layer, a liquid level meter is installed at the bottom of the alkaline tower, part of the alkaline solution at the bottom of the alkaline tower is pumped to a fluosilicic acid removing alkaline tower through the alkaline washing pump, a liquid level regulating valve is arranged between the alkaline tower and the alkaline washing pump through a pipeline, the bottom liquid level of the alkaline tower is controlled to be stable, and the gas which is not absorbed by the alkaline tower is discharged into the atmosphere through a tail gas fan from a.
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| CN202110307326.9A CN113058400A (en) | 2021-03-23 | 2021-03-23 | Powder drying tail gas absorption system |
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| CN202110307326.9A CN113058400A (en) | 2021-03-23 | 2021-03-23 | Powder drying tail gas absorption system |
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| CN110681232A (en) * | 2019-11-07 | 2020-01-14 | 山东博丰利众化工有限公司 | Tail gas washing system of fluorite drying device |
| CN212396376U (en) * | 2020-03-27 | 2021-01-26 | 白银中天化工有限责任公司 | Fluorite stoving tail gas treatment clean system |
| CN212731667U (en) * | 2020-05-29 | 2021-03-19 | 昆山欣谷微电子材料有限公司 | Hydrofluoric acid tail gas processing apparatus |
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