CN210131529U - Production of AlF from HF in fluidized bed off-gas3In a system - Google Patents
Production of AlF from HF in fluidized bed off-gas3In a system Download PDFInfo
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- CN210131529U CN210131529U CN201920502299.9U CN201920502299U CN210131529U CN 210131529 U CN210131529 U CN 210131529U CN 201920502299 U CN201920502299 U CN 201920502299U CN 210131529 U CN210131529 U CN 210131529U
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Abstract
Production of AlF from HF in fluidized bed off-gas3The device and the system belong to the technical field of HF-containing waste gas treatment in the anhydrous aluminum fluoride industry. The method is characterized in that: the aluminum hydroxide bin (1) is connected with at least one VRI reactor (9) through a discharging pipeline provided with a metering feeder (2), the VRI reactor (9) is arranged on a vertical flue of the U-shaped hydrogen fluoride adsorption device (3), one end of the U-shaped hydrogen fluoride adsorption device (3) is a waste gas inlet, and the U-shaped hydrogen fluorideThe other end of the adsorption device (3) is an exhaust gas outlet. The front of the device is connected with a front cyclone dust collector (10), the rear of the device is connected with a rear cyclone dust collector (6), the system adopts two-stage adsorption on the dry adsorption and purification of tail gas, and the two-stage adsorption adopts aluminum hydroxide and fluorine-containing tail gas to carry out adsorption reaction, so that hydrogen fluoride can be fully absorbed. The two-stage adsorption can achieve the aim of obtaining higher fluorine purification efficiency with lower reaction-stage solid-gas ratio.
Description
Technical Field
Production of AlF from HF in fluidized bed off-gas3The device and the system belong to the technical field of HF-containing waste gas treatment in the anhydrous aluminum fluoride industry.
Background
Internationally, there are two major processes for the production of anhydrous aluminum fluoride, one being the double fluidized bed process of swiss buss, and the other being the circulating fluidized bed process of germany pioneer. At present, the production of domestic aluminum fluoride mostly adopts the Swiss technology after digestion and absorption, 30kt/a dry-process aluminum fluoride adopts a double-layer fluidized bed with the diameter of about 3500, and the tail gas of the fluidized bed contains dust (AlF)3And Al2O3And unreacted HF gas, water vapor, air, a small amount of silicon tetrafluoride, sulfur trioxide, and the like.
The current treatment mode of tail gas is (taking a Booth double-layer fluidized bed as an example):
the temperature of tail gas generated by a fluidized bed of the 30kt/a dry-method aluminum fluoride production device is about 320 ℃, the pressure is-18 kPa, and the working condition gas quantity is 11920m3H, HF gas content 5.25g/m3. The prior art is to use lime to neutralize the waste water after absorbing the waste water by water (about 90000t/a of the generated HF content is about 5 g/L), and the HF is finally discarded in a calcium fluoride precipitation mode. The water washing process not only causes the waste of 450t/a of HF, the loss of 450 ten thousand yuan per year according to the AHF of 10000 yuan/t, but also requires the sewage treatment cost of about 100 ten thousand yuan/a because of generating 90000t/a of sewage.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: overcomes the defects of the prior art, and provides a method for producing AlF by using HF in fluidized bed waste gas to realize resource recycling3The device and the system.
The utility model provides a technical scheme that its technical problem adopted is: the
Production of AlF from HF in fluidized bed off-gas3The device of (2), characterized in that: the device comprises an aluminum hydroxide bin, a metering feeder and a U-shaped hydrogen fluoride adsorption device, wherein the aluminum hydroxide bin is connected with at least one VRI (vacuum random access) reactor through a discharging pipeline provided with the metering feeder, the VRI reactor is arranged on a vertical flue of the U-shaped hydrogen fluoride adsorption device, one end of the U-shaped hydrogen fluoride adsorption device is a waste gas inlet, and the other end of the U-shaped hydrogen fluoride adsorption device is a waste gas outlet; the VRI reactor comprises a fluidization element and a conical hollow cylinder which are connected through an elbow, the fluidization element is connected with a blanking pipeline, the conical hollow cylinder is arranged in a vertical flue, and discharge holes are uniformly arranged around the conical hollow cylinder.
The aluminum hydroxide material box of the utility model is filled with Al (OH)3The quantitative feeding of the aluminum hydroxide to the VRI reactor is realized by a metering feeder, the shell of the VRI reactor is cylindrical and comprises a conical hollow cylinder, a fluidization element and the like, and the VRI reactor is characterized in that the aluminum hydroxide is quantitatively fed into the conical hollow cylinder through a feeding box and the fluidization element, the discharge holes arranged along a radial line at the upper part of the shell of the conical hollow cylinder are uniformly arranged around the shell, so that the aluminum oxide flows into a U-shaped hydrogen fluoride adsorption device in an overflow state and fully fills the cross section of the whole pipeline to be fully contacted with HF gas, the aluminum oxide is continuously added, tail gas also continuously flows through the shell, uniform contact is provided for the tail gas and the aluminum hydroxide, the fluorine-containing tail gas is fully contacted, uniformly mixed and subjected to adsorption reaction with the aluminum oxide at the moment, and the.
With Al (OH)3Adsorption principle of HF gas in adsorption tail gas:
the adsorption of the aluminum hydroxide on the hydrogen fluoride is mainly chemical adsorption, and the reaction is as follows:
Al(OH)3＋3HF→AlF3＋3H2O
meanwhile, physical adsorption is also accompanied, and the absorption process is as follows:
1) hydrogen fluoride is diffused in the gas phase;
2) hydrogen fluoride reaches the surface of the aluminum hydroxide through a gas film on the surface of the aluminum hydroxide;
3) the hydrogen fluoride is adsorbed by the action of the atomic valence force on the surface of the aluminum hydroxide;
4) the adsorbed hydrogen fluoride chemically reacts with aluminum hydroxide to produce a surface compound.
In the adsorption process, the utility model discloses can provide sufficient turbulence, let aluminium hydroxide and fluoridize the hydrogen gas full contact of gas, promote the air current diffusion, reach better adsorption effect.
Preferably, the bottom of the U-shaped hydrogen fluoride adsorption device is provided with a device flap type air locking discharge valve.
AlF production by using HF in fluidized bed waste gas3The system of (a), characterized by: comprising the use of HF in the off-gas of a fluidized bed for the production of AlF3The waste gas inlet of the U-shaped hydrogen fluoride adsorption device is connected with the waste gas outlet of the front cyclone dust collector, and the waste gas outlet of the U-shaped hydrogen fluoride adsorption device is connected with the waste gas inlet of the rear cyclone dust collector.
The system adds two sections of VRI reactors behind the two-stage cyclone dust collector, the HF adsorption efficiency is more than or equal to 90 percent, and the tail gas after HF adsorption enters the tail gas condenser. The system adopts two-stage adsorption on dry adsorption and purification of tail gas, and the two-stage adsorption adopts aluminum hydroxide and fluorine-containing tail gas to carry out adsorption reaction, so that hydrogen fluoride can be fully absorbed. The two-stage adsorption can achieve the aim of obtaining higher fluorine purification efficiency with lower reaction-stage solid-gas ratio.
Preferably, the bottom of the rear cyclone dust collector is provided with a dust collector flap type air-locking discharge valve which is connected with a dust collector material box through a powder pipeline.
Preferably, the device turnover plate type air locking discharge valve at the bottom of the U-shaped hydrogen fluoride adsorption device is connected with the powder pipeline through a pipeline. And collecting powder collected in the U-shaped hydrogen fluoride adsorption device and powder collected by the rear cyclone dust collector and feeding the powder into a dust collector material box.
The bottom of the dust remover bin is connected with an original aluminum hydroxide distribution bin.
Compared with the prior art, the utility model discloses an utilize HF production AlF in the fluidized bed waste gas3The device and the system have the advantages that: the utility model discloses a production AlF3The aluminum hydroxide box in the device is filled with Al (OH)3The quantitative feeding of the aluminum hydroxide to the VRI reactor is realized by a metering feeder, the shell of the VRI reactor is cylindrical and comprises a conical hollow cylinder, a fluidization element and the like, and the VRI reactor is characterized in that the aluminum hydroxide is quantitatively fed into the conical hollow cylinder through a feeding box and the fluidization element, the discharge holes arranged along a radial line at the upper part of the shell of the conical hollow cylinder are uniformly arranged around the shell, so that the aluminum oxide flows into a U-shaped hydrogen fluoride adsorption device in an overflow state and fully fills the cross section of the whole pipeline to be fully contacted with HF gas, the aluminum oxide is continuously added, tail gas also continuously flows through the shell, uniform contact is provided for the tail gas and the aluminum hydroxide, the fluorine-containing tail gas is fully contacted, uniformly mixed and subjected to adsorption reaction with the aluminum oxide at the moment, and the. Production of AlF3In the system, two sections of VRI reactors are added behind the two stages of cyclone dust collectors, the HF adsorption efficiency is more than or equal to 90 percent, and tail gas after HF adsorption enters a tail gas condenser. The system adopts two-stage adsorption on dry adsorption and purification of tail gas, and the two-stage adsorption adopts aluminum hydroxide and fluorine-containing tail gas to carry out adsorption reaction, so that hydrogen fluoride can be fully absorbed. The two-stage adsorption can achieve the aim of obtaining higher fluorine purification efficiency with lower reaction-stage solid-gas ratio.
Drawings
FIG. 1 shows that the utility model discloses a method for producing AlF by using HF in fluidized bed waste gas3Schematic representation of the apparatus of (1).
Figure 2 is a schematic diagram of a VRI reactor used in the present invention.
FIG. 3 shows that the utility model discloses a production of AlF by HF in fluidized bed waste gas3Schematic diagram of the system of (1).
The device comprises an aluminum hydroxide bin 1, an aluminum hydroxide bin 2, a metering feeder 3, a U-shaped hydrogen fluoride adsorption device 4, a device turning plate type air locking discharge valve 5, a dust remover turning plate type air locking discharge valve 6, a rear cyclone dust remover 7, a dust remover bin 8, a raw aluminum hydroxide distributing bin 9, a VRI reactor 901 conical hollow cylinder 902, a fluidizing element 903, a discharge hole 10 and a front cyclone dust remover.
Detailed Description
Fig. 1 to 2 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 3.
With reference to figures 1, 2: the utility model discloses an utilize HF production AlF in fluidized bed waste gas3The device of (2): the device comprises an aluminum hydroxide material box 1, a metering feeder 2 and a U-shaped hydrogen fluoride adsorption device 3, wherein the bottom of the U-shaped hydrogen fluoride adsorption device 3 is provided with a device flap type air locking and discharging valve 4, one end of the U-shaped hydrogen fluoride adsorption device 3 is a waste gas inlet, and the other end of the U-shaped hydrogen fluoride adsorption device 3 is a waste gas outlet; the aluminum hydroxide bin 1 is connected with two VRI reactors 9 through a discharging pipeline provided with a doser 2, one VRI reactor 9 is arranged at the upper end of a vertical flue at a waste gas inlet of the U-shaped hydrogen fluoride adsorption device 3, the other VRI reactor 9 is arranged at the lower end of the vertical flue at a waste gas outlet of the U-shaped hydrogen fluoride adsorption device 3, the main body part of the VRI reactor 9 is cylindrical, the VRI reactor 9 comprises a fluidizing element 902 and a conical hollow cylinder 901 which are connected through a bent pipe, the fluidizing element 902 is connected with the discharging pipeline under the aluminum hydroxide bin 1, the conical hollow cylinder 901 is arranged in the vertical flue, and discharging holes 903 are uniformly arranged around the conical hollow cylinder 901.
Referring to FIG. 3: the utility model discloses an utilize HF production AlF in fluidized bed waste gas3The system of (2): production of AlF as shown in FIGS. 1 and 23The device the place ahead is connected with preceding cyclone 10, and the waste gas entry of U type hydrogen fluoride adsorption equipment 3 connects the waste gas outlet of preceding cyclone 10, and the device rear is connected with back cyclone 6, and the waste gas exit of U type hydrogen fluoride adsorption equipment 3 connects the waste gas entry of back cyclone 6. The bottom of the rear cyclone dust collector 6 is provided with a dust collector flap type air-locking discharge valve 5, and the dust collector flap type air-locking discharge valve 5 is connected with a powder pipelineA dust remover material box 7 is connected; the device turnover plate type air locking discharge valve 4 at the bottom of the U-shaped hydrogen fluoride adsorption device 3 is connected with the powder pipeline through a pipeline; the bottom of the dust remover material box 7 is connected with an original aluminum hydroxide material distributing box 8.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (6)
1. AlF production by using HF in fluidized bed waste gas3The device of (2), characterized in that: the device comprises an aluminum hydroxide material box (1), a metering feeder (2) and a U-shaped hydrogen fluoride adsorption device (3), wherein the aluminum hydroxide material box (1) is connected with at least one VRI reactor (9) through a discharging pipeline provided with the metering feeder (2), the VRI reactor (9) is arranged on a vertical flue of the U-shaped hydrogen fluoride adsorption device (3), one end of the U-shaped hydrogen fluoride adsorption device (3) is a waste gas inlet, and the other end of the U-shaped hydrogen fluoride adsorption device (3) is a waste gas outlet; the VRI reactor (9) comprises a fluidization element (902) and a conical hollow cylinder (901) which are connected through an elbow, the fluidization element (902) is connected with a blanking pipeline, the conical hollow cylinder (901) is arranged in a vertical flue, and discharge holes (903) are uniformly arranged around the conical hollow cylinder (901).
2. AlF production with HF in fluidized bed off-gas according to claim 13The device of (2), characterized in that: the bottom of the U-shaped hydrogen fluoride adsorption device (3) is provided with a device flap type air locking discharge valve (4).
3. AlF production by using HF in fluidized bed waste gas3The system of (a), characterized by: including rightThe device, the front cyclone (10) and the rear cyclone (6) according to claim 1 or 2, wherein the waste gas inlet of the U-shaped hydrogen fluoride adsorption device (3) is connected with the waste gas outlet of the front cyclone (10), and the waste gas outlet of the U-shaped hydrogen fluoride adsorption device (3) is connected with the waste gas inlet of the rear cyclone (6).
4. AlF production according to claim 3 using HF in fluidized bed off-gas3The system of (a), characterized by: the bottom of the rear cyclone dust collector (6) is provided with a dust collector flap type air-locking discharge valve (5), and the dust collector flap type air-locking discharge valve (5) is connected with a dust collector material box (7) through a powder pipeline.
5. AlF production according to claim 4 using HF in fluidized bed off-gas3The system of (a), characterized by: the device turnover plate type air locking discharge valve (4) at the bottom of the U-shaped hydrogen fluoride adsorption device (3) is connected with the powder pipeline through a pipeline.
6. AlF production according to claim 4 using HF in fluidized bed off-gas3The system of (a), characterized by: the bottom of the dust remover material box (7) is connected with an original aluminum hydroxide material distributing box (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920502299.9U CN210131529U (en) | 2019-04-15 | 2019-04-15 | Production of AlF from HF in fluidized bed off-gas3In a system |
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| CN201920502299.9U CN210131529U (en) | 2019-04-15 | 2019-04-15 | Production of AlF from HF in fluidized bed off-gas3In a system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517348A (en) * | 2020-04-01 | 2020-08-11 | 白银中天化工有限责任公司 | Production process for regenerating aluminum fluoride by using aluminum fluoride production tail gas washing liquid |
| CN114180609A (en) * | 2021-12-10 | 2022-03-15 | 云南云天化氟化学有限公司 | Aluminum fluoride standby production line and process flow |
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2019
- 2019-04-15 CN CN201920502299.9U patent/CN210131529U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517348A (en) * | 2020-04-01 | 2020-08-11 | 白银中天化工有限责任公司 | Production process for regenerating aluminum fluoride by using aluminum fluoride production tail gas washing liquid |
| CN114180609A (en) * | 2021-12-10 | 2022-03-15 | 云南云天化氟化学有限公司 | Aluminum fluoride standby production line and process flow |
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