CN109289444B - Converter gas outlet method for anhydrous hydrofluoric acid production line - Google Patents
Converter gas outlet method for anhydrous hydrofluoric acid production line Download PDFInfo
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- CN109289444B CN109289444B CN201810823214.7A CN201810823214A CN109289444B CN 109289444 B CN109289444 B CN 109289444B CN 201810823214 A CN201810823214 A CN 201810823214A CN 109289444 B CN109289444 B CN 109289444B
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 title claims abstract description 120
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- 239000007789 gas Substances 0.000 claims abstract description 119
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims abstract description 80
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 4
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- 229910000831 Steel Inorganic materials 0.000 claims description 22
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000010428 baryte Substances 0.000 claims description 4
- 229910052601 baryte Inorganic materials 0.000 claims description 4
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- 238000009835 boiling Methods 0.000 description 1
- 206010006451 bronchitis Diseases 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/19—Fluorine; Hydrogen fluoride
- C01B7/191—Hydrogen fluoride
- C01B7/192—Preparation from fluorspar
-
- 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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/30—Capture or disposal of greenhouse gases of perfluorocarbons [PFC], hydrofluorocarbons [HFC] or sulfur hexafluoride [SF6]
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a converter gas outlet method for an anhydrous hydrofluoric acid production line, which comprises the following steps: (1) assembling an air inlet buffer; (2) pipeline connection: connecting the different-diameter multi-way connecting pipe to an air inlet buffer, wherein the connecting pipe is connected with the different-diameter multi-way connecting pipe; (3) connecting water pipes at the positions where the connecting pipes are connected with the washing tower, wherein the water pipes are provided with electromagnetic valves and corresponding central control electric boxes; (5) gas outlet: after the preparation reaction starts for 5-10min, opening an air inlet buffer, allowing the hydrogen fluoride gas to dispersedly flow into a connecting pipe, and then feeding the hydrogen fluoride gas into a washing tower (6) pipeline through the connecting pipe for washing; on one hand, the gas inlet buffer is arranged to reduce the gas output of the hydrogen fluoride gas in unit time, so that the gas transmission amount in unit time in the connecting pipe is lower, and the corrosion effect of the hydrogen fluoride gas on the pipe wall is reduced; on the other hand, the conveying capacity of each connecting pipe for conveying the hydrogen fluoride gas in a shunting manner by adopting a plurality of connecting pipes is reduced, the corrosion effect is further buffered, and the production safety is improved.
Description
Technical Field
The invention belongs to a hydrofluoric acid production line, and relates to a converter gas outlet method of an anhydrous hydrofluoric acid production line.
Background
The hydrogen fluoride is colorless liquid or gas, has molecular weight of 20.01, and is easily soluble in water. Its boiling point is 19.5 deg.C, and it is not inflammable. Belongs to a highly hazardous medium, and the maximum allowable concentration in the air is 1mg/m3. Its toxic harm is strong irritation to respiratory mucosa and skin, and inhalation of high concentration of hydrogen fluoride can cause bronchitis and pneumonia, even produce radioactive asphyxia. Hydrogen fluoride has strong corrosivity on metal, glass and silicon-containing objects, and if the hydrogen fluoride is subjected to high heat, the internal pressure of a container is rapidly increased, so that the container has the risks of cracking and explosion.
The production process of anhydrous hydrogen fluoride is characterized by that it uses fluorite powder, concentrated sulfuric acid whose mass fraction is 98% and fuming sulfuric acid as raw material, and makes them be heated in a rotary reaction furnace to produce crude hydrogen fluoride gas, and makes the crude hydrogen fluoride gas undergo the processes of washing, condensation, rectification and degassing so as to obtain the anhydrous hydrogen fluoride product, and the by-products are fluosilicic acid and gypsum.
In actual production, the characteristics of strong corrosivity and high toxicity of the hydrogen fluoride gas and high temperature of the converter are found to provide high design requirements for material selection, laying modes and the like of a conveying pipeline. If improper design can lead to the occurrence of conditions such as leakage, blockage and the like, stable operation of production is influenced, and safety accidents such as casualties and the like are easy to occur.
Disclosure of Invention
The invention aims to provide a converter gas outlet method of an anhydrous hydrofluoric acid production line, aiming at the problems in hydrofluoric acid production, the gas outlet mode of hydrogen fluoride gas is modified, on one hand, the gas outlet amount of the hydrogen fluoride gas in unit time is reduced by arranging a gas inlet buffer, so that the gas transmission amount in unit time in a connecting pipe is lower, and the corrosion effect of the hydrogen fluoride gas on the pipe wall is reduced; on the other hand, the conveying capacity of each connecting pipe for conveying the hydrogen fluoride gas in a shunting manner by adopting a plurality of connecting pipes is reduced, and the corrosion effect is further buffered, so that the service life of the pipeline is prolonged, the production safety is improved, and the probability of safety accidents is effectively reduced.
In order to solve the technical scheme, the following technical scheme is adopted:
a converter gas outlet method of an anhydrous hydrofluoric acid production line is characterized by comprising the following steps:
(1) assembling an air inlet buffer;
(2) pipeline connection: firstly, coating an anticorrosive coating on the surfaces of the different-diameter multi-way connecting pipe and the connecting pipe, and connecting the different-diameter multi-way connecting pipe to an air inlet buffer through a flange cover, wherein the number of external interfaces of the different-diameter multi-way connecting pipe is more than or equal to 2, and 3 instrument ports are arranged on the upper end surface of the different-diameter multi-way connecting pipe; the outer interface is connected with a connecting pipe, and the other end of the connecting pipe is connected with the washing tower; after the connecting pipe is installed, a small cooler is carried on the connecting pipe; after the pipeline connection is finished, a pressure detection instrument, a temperature detection instrument and a hydrogen fluoride gas detection instrument are installed on the instrument opening;
(3) the connecting pipes are connected with the washing tower, the water pipes are provided with electromagnetic valves and are provided with corresponding central control electric boxes, the electromagnetic valves, the air inlet buffer and the small cooler are all connected to the interfaces of the central control electric boxes through leads and are directly controlled by the central control electric boxes, and the pressure detecting instrument, the temperature detecting instrument and the hydrogen fluoride gas detecting instrument are transmitted into the central control electric boxes;
(4) detecting the air tightness of the pipeline interface position;
(5) gas outlet: after the preparation reaction starts for 5-10min, opening an air inlet buffer, allowing the hydrogen fluoride gas to dispersedly flow into a connecting pipe, and then sending the hydrogen fluoride gas into a washing tower through the connecting pipe; the highest temperature in the central control electric box is 75-80 ℃, the lowest temperature is 65-70 ℃, the highest concentration of hydrogen fluoride gas is 0.98-1.05g/mL, and the lowest concentration of hydrogen fluoride gas is 0.75-0.82 g/mL; when the detected temperature is higher than the highest temperature, the small cooler starts to work until the temperature is reduced to be lower than the lowest temperature; when the detected concentration is higher than the highest concentration, the operation speed of the air inlet buffer is reduced, and when the detected concentration is lower than the lowest concentration, the operation speed of the air inlet buffer is increased;
(6) washing a pipeline: when the detected concentration of the hydrogen fluoride gas is lower than 0.081-0.121g/mL, the reaction is finished, at the moment, the central control electric box automatically opens the electromagnetic valve, and the connecting pipe and the reducing multi-way connecting pipe are washed for 2-5min by adopting a water flow flushing method.
After optimization, the gas inlet buffer is assembled, the gas inlet buffer consists of an inlet, an outlet, a gas flow passage and a buffer, the buffer comprises a motor, a transmission mechanism, a driving gear shaft and a steel rod, the output end of the motor is connected to the input end of the transmission mechanism, the output end of the transmission mechanism is connected to the driving gear shaft, the driving gear shaft is carried on a driven gear of the steel rod in a meshing manner, an outlet plug is welded at the upper end of the steel rod, and an inlet plug is welded at the lower end of the steel rod; and after the assembly is finished, performing trial operation, and after the trial operation is correct, assembling the gas outlet into the flange cover. The air inlet buffer is used for reducing the air output per unit time, thereby reducing the air output per unit time in the connecting pipe, and the working principle is as follows: after the motor works, the driving gear shaft is driven to rotate, the rotating motion is converted into the up-and-down motion of the steel rod through the meshing action, in the up-and-down moving process, the outlet plug blocks the outlet, the inlet plug opens the inlet, and the hydrogen fluoride gas flows into the air inlet buffer; after the steel rod moves up to the top, the steel rod moves down, in the moving down process, the inlet plug blocks the inlet, the outlet plug opens the outlet, and hydrogen fluoride gas is sent out by the gas inlet buffer; the circulation movement reduces the gas transmission amount of the connecting pipe in unit time and reduces the corrosion effect of the hydrogen fluoride gas.
Preferably, before the components are assembled into the air buffer, the components are taken out, and the surfaces of the components are coated with the anticorrosive coatings. The anticorrosive coating is compact and stable, and has strong acid resistance, especially good hydrogen fluoride corrosion resistance.
Preferably, the transmission mechanism consists of a shoulder, a connecting plate and a reciprocating gear, and during assembly, one end of the shoulder is connected with the motor, the other end of the shoulder is connected with the connecting plate, and the connecting plate is connected to the reciprocating gear and is connected with the driving gear shaft through the reciprocating gear. Under the transmission action of the transmission mechanism, the motor runs smoothly.
After optimization, the anticorrosive coating is selected from one of modified phenolic resin, barite and nano chromium powder. The anticorrosive materials are compact and stable, and have good strong acid resistance, especially good hydrogen fluoride corrosion resistance.
Preferably, the connecting pipe comprises a short pipe, a corrugated pipe compensator and a short pipe with a connecting pipe, the corrugated pipe compensator is connected to the middle position, and a small cooler is carried on the surface of the corrugated pipe compensator. The corrugated pipe compensator provides thermal compensation for the connecting pipe, compensates the heated elongation of the connecting pipe caused by heating, thereby weakening or eliminating the stress generated by thermal expansion and cold contraction and keeping the structural shape of the connecting pipe stable.
Preferably, the central control electric box comprises a signal conversion circuit, a signal identification circuit and a logic control circuit, wherein the input end of the signal conversion circuit is connected with the pressure detection instrument, the temperature detection instrument and the hydrogen fluoride gas detection instrument, the output end of the signal conversion circuit is connected with the signal identification circuit, the output end of the signal identification circuit is connected with the logic control circuit, and the logic control circuit controls the electromagnetic valve, the air inlet buffer and the small cooler. The signal conversion circuit can convert signals detected by the pressure detection instrument, the temperature detection instrument and the hydrogen fluoride gas detection instrument into electric signals, the electric signals are transmitted to the signal identification circuit, the signal identification circuit identifies and judges the electric signals, and the logic control circuit sends corresponding control instructions to the identified signals. Thereby realizing the automatic control function of the central control electric box on the electromagnetic valve, the air inlet buffer and the small cooler.
Preferably, the specific steps of the air tightness detection in the step (4) are as follows: and filling nitrogen into the converter, wherein the nitrogen flows from the converter to each pipeline, detecting the air tightness of each structural position, and performing the next procedure after the air tightness is detected without errors. The gas tightness detection can ensure that the hydrogen fluoride gas does not leak, improve the production safety and reduce the probability of safety accidents.
Preferably, after the washing in the step (6) is completed, the solution in the converter is taken out, purified and filtered to obtain the hydrogen fluoride solution. The hydrogen fluoride solution can be recycled, accords with the scientific and environment-friendly production concept, and has certain economic benefit.
Due to the adoption of the technical scheme, the method has the following beneficial effects:
the invention relates to a converter gas outlet method of an anhydrous hydrofluoric acid production line, which aims at the problems in hydrofluoric acid production and modifies the gas outlet mode of hydrogen fluoride gas, on one hand, the gas outlet amount of the hydrogen fluoride gas in unit time is reduced by arranging a gas inlet buffer, so that the gas transmission amount in unit time in a connecting pipe is lower, and the corrosion effect of the hydrogen fluoride gas on the pipe wall is reduced; on the other hand, the conveying capacity of each connecting pipe for conveying the hydrogen fluoride gas in a shunting manner by adopting a plurality of connecting pipes is reduced, and the corrosion effect is further buffered, so that the service life of the pipeline is prolonged, the production safety is improved, and the probability of safety accidents is effectively reduced. The concrete beneficial effects are shown as the following points;
1. the air inlet buffer is used for reducing the air output per unit time, thereby reducing the air output per unit time in the connecting pipe, and the working principle is as follows: after the motor works, the driving gear shaft is driven to rotate, the rotating motion is converted into the up-and-down motion of the steel rod through the meshing action, in the up-and-down moving process, the outlet plug blocks the outlet, the inlet plug opens the inlet, and the hydrogen fluoride gas flows into the air inlet buffer; after the steel rod moves up to the top, the steel rod moves down, in the moving down process, the inlet plug blocks the inlet, the outlet plug opens the outlet, and hydrogen fluoride gas is sent out by the gas inlet buffer; the circulation movement reduces the gas transmission amount of the connecting pipe in unit time and reduces the corrosion effect of the hydrogen fluoride gas.
2. The invention adopts the matching of the reducing multi-way connecting pipe and the connecting pipe to convey the hydrogen fluoride gas, the reducing multi-way connecting pipe comprises 2 or more external interfaces, each external interface is connected with one connecting pipe, and each connecting pipe is connected to the washing tower; many connecting pipes carry the hydrogen fluoride gas to the scrubbing tower with the reposition of redundant personnel form in, compare current air outlet system, the hydrogen fluoride gas that flows through in every connecting pipe obviously reduces, obviously reduces to the corrosive action of connecting pipe.
3. The invention is provided with a water pipe, the opening and closing of the water pipe are controlled by an electromagnetic valve, the concentration of the hydrogen fluoride gas in the reducing multi-way connecting pipe is used as a judgment standard for judging whether the reaction is finished, the electromagnetic valve is opened after the reaction is confirmed to be finished, the inner walls of the connecting pipe and the reducing multi-way connecting pipe are washed, and the residual hydrogen fluoride gas is taken out to the converter. The corrosion of the residual liquid to the pipeline is avoided. Simple structure, ingenious design and convenient operation.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of the entire converter gas outlet system;
FIG. 2 is a schematic view of an inlet opening of an air intake buffer;
FIG. 3 is a schematic view of the inlet buffer with the outlet open;
fig. 4 is a schematic block diagram of the central control box.
Detailed Description
As shown in fig. 1 to 4, a converter gas outlet method of an anhydrous hydrofluoric acid production line comprises the following steps:
(1) the intake buffer 3 is assembled:
a. before being assembled into the air buffer 3, firstly taking the parts of the air buffer 3, including a machine shell 28, a motor 27, a driving gear shaft 23, a steel rod 21, a shoulder 26, a connecting plate 25, a reciprocating gear 24, an inlet plug 20 and an outlet plug 17; the upper end of the casing 28 is provided with an outlet 16, the lower end of the casing 28 is provided with an inlet 19, and a gas channel 18 is formed in the casing 28; and (3) coating an anticorrosive coating on the surfaces of the parts and the inner surface of the shell 28, wherein the anticorrosive coating is selected from one of modified phenolic resin, barite and nano chromium powder. The anticorrosive materials are compact and stable, and have good strong acid resistance, especially good hydrogen fluoride corrosion resistance.
b. The air inlet buffer 3 is assembled, the air inlet buffer 3 is composed of an inlet 19, an outlet 16, an air flow passage 18 and a buffer, and the buffer comprises a motor 27, a shoulder 26, a connecting plate 25, a reciprocating gear 24, a driving gear shaft 23 and a steel rod 21. During assembly, one end of the shoulder 26 is connected with the motor 27, the other end of the shoulder is connected with the connecting plate 25, the connecting plate 25 is connected to the reciprocating gear 24, the reciprocating gear 24 is connected with the driving gear shaft 23, the driving gear shaft 23 is carried on the driven gear 22 of the steel rod 21 in a meshing mode, the upper end of the steel rod 21 is welded with the outlet plug 17, the lower end of the steel rod 21 is welded with the inlet plug 20, the outlet plug 17 is matched with the outlet 16 at the upper end, the outlet 16 can be completely blocked, the inlet plug 20 is matched with the inlet 19 at the lower end, and the inlet 19 can be completely blocked. The air-intake buffer 3 is for reducing the amount of air discharged per unit time to reduce the amount of air supplied per unit time in the connection pipe 8, and its operation principle is: after the motor 27 works, the driving gear shaft 23 is driven to rotate, the rotating motion is converted into the up-and-down motion of the steel rod 21 through the meshing action, in the up-and-down moving process, the outlet plug 17 blocks the outlet 16, the inlet plug 20 opens the inlet 19, and the hydrogen fluoride gas flows into the air inlet buffer 3; after the steel rod moves up to the top, the steel rod 21 moves down, in the process of moving down, the inlet plug 20 blocks the inlet 19, the outlet plug 17 opens the outlet 16, and hydrogen fluoride gas is sent out from the gas inlet buffer 3; the circulation movement reduces the gas transmission amount of the connecting pipe 8 in unit time and reduces the corrosion effect of the hydrogen fluoride gas.
c. After the assembly is completed, the test run is carried out, and after the test run is correct, the gas outlet 2 is assembled by means of the flange cover.
(2) Pipeline connection:
firstly, the surfaces of the reducing multi-way connecting pipe 4 and the connecting pipe 8 are coated with an anticorrosive coating, and the anticorrosive coating is selected from one of modified phenolic resin, barite and nano chromium powder. The anticorrosive materials are compact and stable, and have good strong acid resistance, especially good hydrogen fluoride corrosion resistance.
Then the different-diameter multi-way connecting pipe 4 is connected to the air inlet buffer 3 through a flange cover, the number of external interfaces of the different-diameter multi-way connecting pipe 4 is 2, and the upper end face of the different-diameter multi-way connecting pipe 4 is provided with 3 instrument ports; connecting pipes 8 are connected to each external port, and the other ends of the two connecting pipes 8 are connected to a washing tower 15.
The connecting pipe 8 comprises nozzle stub 11, corrugated expansion ware 10 and area connecting pipe nozzle stub 9, and corrugated expansion ware 10 is connected in the intermediate position, and corrugated expansion ware 10 provides thermal compensation for connecting pipe 8, compensates the extension by heat that connecting pipe 8 is heated and arouses to weaken or eliminate because of the produced stress of expend with heat and contract with cold power, keep the structural shape stability of connecting pipe 8. After the connection pipe 8 is mounted, a small-sized cooler 12 is mounted on the surface of the bellows compensator 10. After the pipeline connection is finished, a pressure detection instrument 5, a temperature detection instrument 6 and a hydrogen fluoride gas detection instrument 7 are installed on the instrument opening;
(3) the connecting pipe 8 is connected with a washing tower 15 and is connected with a water pipe 13, the water pipe 13 is provided with an electromagnetic valve 14, and is provided with a corresponding central control electric box, the electromagnetic valve 14, the air inlet buffer 3 and the small cooler 12 are all connected to the interface of the central control electric box through leads and are directly controlled by the central control electric box, and the pressure detecting instrument 5, the temperature detecting instrument 6 and the hydrogen fluoride gas detecting instrument 7 are transmitted into the central control electric box.
The central control electric box comprises a signal conversion circuit, a signal identification circuit and a logic control circuit, wherein the input end of the signal conversion circuit is connected with the pressure detection instrument 5, the temperature detection instrument 6 and the hydrogen fluoride gas detection instrument 7, the output end of the signal conversion circuit is connected with the signal identification circuit, the output end of the signal identification circuit is connected with the logic control circuit, and the logic control circuit controls the electromagnetic valve 14, the air inlet buffer 3 and the small cooler 12. The signal conversion circuit can convert signals detected by the pressure detection instrument 5, the temperature detection instrument 6 and the hydrogen fluoride gas detection instrument 7 into electric signals, and then the electric signals are transmitted to the signal identification circuit, the signal identification circuit identifies and judges the electric signals, and the logic control circuit sends corresponding control instructions to the identified signals. Thereby realizing the automatic control function of the central control electric box on the electromagnetic valve 14, the air inlet buffer 3 and the small cooler 12.
(4) And (3) detecting the air tightness of the pipeline joint position:
and (3) filling nitrogen into the converter 1, wherein the nitrogen flows from the converter 1 to each pipeline, detecting the air tightness of each structural position, and performing the next procedure after the air tightness is detected without errors. The gas tightness detection can ensure that the hydrogen fluoride gas does not leak, improve the production safety and reduce the probability of safety accidents.
(5) Gas outlet:
after 8min after the preparation reaction starts, opening the gas inlet buffer 3, allowing the hydrogen fluoride gas to dispersedly flow into the connecting pipe 8, and then sending the hydrogen fluoride gas into the washing tower 15 through the connecting pipe 8; the highest temperature of the central control electric box is 75 ℃, the lowest temperature of the central control electric box is 70 ℃, the highest concentration of hydrogen fluoride gas is 1.03g/mL, and the lowest concentration of hydrogen fluoride gas is 0.82 g/mL;
when the detection temperature is higher than 75 ℃, the temperature detection instrument 6 transmits a temperature signal to the central control electric box, the central control electric box controls the small cooler 12 to start working according to the temperature signal, the gas temperature in the connecting pipe 8 is reduced along with the working of the small cooler 12, and the small cooler 12 stops working after the temperature is reduced to 70 ℃, so that the gas temperature in the connecting pipe 8 is maintained, and the corrosion effect of the hydrogen fluoride gas is reduced.
When the detection concentration is higher than 1.03g/mL, the hydrogen fluoride gas detection instrument 7 transmits the signal to the central control electric box, the central control electric box controls the motor 27 of the air inlet buffer 3 to decelerate according to the signal, the air inlet gradually becomes slow, the concentration of the hydrogen fluoride gas in the reducing multi-way connecting pipe 4 is reduced, and the hydrogen fluoride gas concentration is maintained at a certain concentration value lower than 1.03 g/mL; when the detection concentration is lower than 0.82g/mL, the hydrogen fluoride gas detection instrument 7 transmits the signal to the central control electric box, the central control electric box controls the motor 27 of the air inlet buffer 3 to accelerate according to the signal, the air inlet is gradually accelerated, the concentration of the hydrogen fluoride gas in the different-diameter multi-way connecting pipe 4 is increased, and the hydrogen fluoride gas is maintained at a certain concentration value higher than 0.82 g/mL.
(6) Washing a pipeline: when the detected concentration of the hydrogen fluoride gas is lower than 0.089g/mL, the reaction is finished, at the moment, the central control electric box automatically opens the electromagnetic valve 14, and the connecting pipe 8 and the reducing multi-way connecting pipe 4 are washed for 5min by adopting a water flow flushing method. After washing, the solution in the converter 1 is taken out, purified and filtered to obtain a hydrogen fluoride solution. The hydrogen fluoride solution can be recycled, accords with the scientific and environment-friendly production concept, and has certain economic benefit.
And (3) corrosion detection:
in one year after the equipment is put into use, the connecting pipe 8 is disassembled, and the corrosion rate of the inner wall of the connecting pipe 8 is detected; meanwhile, the connecting pipe 8 of the existing equipment used for one year is taken, and the corrosion rate of the inner wall of the connecting pipe 8 is detected. The results are shown in table 1:
TABLE 1
| Inventive connecting tube 8 | Corrosion Rate (mm/a) | Original equipment connecting pipe 8 | Corrosion Rate (mm/a) |
| Short pipe 111 | 0.11 | Short pipe 111 | 0.19 |
| Short pipe 112 | 0.07 | Short pipe 112 | 0.20 |
| Short pipe 91 with connecting pipe | 0.09 | Short pipe 91 with connecting pipe | 0.16 |
| Short pipe 92 with connecting pipe | 0.013 | Short pipe 92 with connecting pipe | 0.22 |
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made on the basis of the present invention to solve the same technical problems and achieve the same technical effects are all covered in the protection scope of the present invention.
Claims (9)
1. A converter gas outlet method of an anhydrous hydrofluoric acid production line is characterized by comprising the following steps:
(1) assembling an air inlet buffer;
(2) pipeline connection: firstly, coating an anticorrosive coating on the surfaces of the different-diameter multi-way connecting pipe and the connecting pipe, and connecting the different-diameter multi-way connecting pipe to an air inlet buffer through a flange cover, wherein the number of external interfaces of the different-diameter multi-way connecting pipe is more than or equal to 2, and 3 instrument ports are arranged on the upper end surface of the different-diameter multi-way connecting pipe; the outer interface is connected with a connecting pipe, and the other end of the connecting pipe is connected with the washing tower; after the connecting pipe is installed, a small cooler is carried on the connecting pipe; after the pipeline connection is finished, a pressure detection instrument, a temperature detection instrument and a hydrogen fluoride gas detection instrument are installed on the instrument opening;
(3) the connecting pipes are connected with the washing tower, the water pipes are provided with electromagnetic valves and are provided with corresponding central control electric boxes, the electromagnetic valves, the air inlet buffer and the small cooler are all connected to the interfaces of the central control electric boxes through leads and are directly controlled by the central control electric boxes, and the pressure detecting instrument, the temperature detecting instrument and the hydrogen fluoride gas detecting instrument are transmitted into the central control electric boxes;
(4) detecting the air tightness of the pipeline interface position;
(5) gas outlet: after the preparation reaction starts for 5-10min, opening an air inlet buffer, allowing the hydrogen fluoride gas to dispersedly flow into a connecting pipe, and then sending the hydrogen fluoride gas into a washing tower through the connecting pipe; the highest temperature in the central control electric box is preset to be 75-80 ℃, the lowest temperature is 65-70 ℃, the highest concentration of hydrogen fluoride gas is 0.98-1.05g/mL, and the lowest concentration of hydrogen fluoride gas is 0.75-0.82 g/mL; when the detected temperature is higher than the highest temperature, the small cooler starts to work until the temperature is reduced to be lower than the lowest temperature; when the detected concentration is higher than the highest concentration, the operation speed of the air inlet buffer is reduced, and when the detected concentration is lower than the lowest concentration, the operation speed of the air inlet buffer is increased;
(6) washing a pipeline: when the detected concentration of the hydrogen fluoride gas is lower than 0.081-0.121g/mL, the reaction is finished, at the moment, the central control electric box automatically opens the electromagnetic valve, and the connecting pipe and the reducing multi-way connecting pipe are washed for 2-5min by adopting a water flow flushing method.
2. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 1, wherein: the gas inlet buffer is assembled, the gas inlet buffer consists of an inlet, an outlet, a gas flow passage and a buffer, the buffer comprises a motor, a transmission mechanism, a driving gear shaft and a steel rod, the output end of the motor is connected to the input end of the transmission mechanism, the output end of the transmission mechanism is connected to the driving gear shaft, the driving gear shaft is carried on a driven gear of the steel rod in a meshing manner, the upper end of the steel rod is welded with an outlet plug, and the lower end of the steel rod is welded with an inlet plug; and after the assembly is finished, performing trial operation, and after the trial operation is correct, assembling the gas outlet into the flange cover.
3. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 2, wherein: before the components are assembled in the air buffer, the components are taken out, and the surfaces of the components are coated with anticorrosive coatings.
4. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 2, wherein: the transmission mechanism consists of a shoulder, a connecting plate and a reciprocating gear, when in assembly, one end of the shoulder is connected with the motor, the other end of the shoulder is connected with the connecting plate, and the connecting plate is connected to the reciprocating gear and is connected with the driving gear shaft through the reciprocating gear.
5. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 3, wherein: the anticorrosive coating is selected from one of modified phenolic resin, barite and nano chromium powder.
6. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 1, wherein: the connecting pipe consists of a short pipe, a corrugated pipe compensator and a short pipe with a connecting pipe, the corrugated pipe compensator is connected at the middle position, and a small cooler is carried on the surface of the corrugated pipe compensator.
7. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 1, wherein: the central control electric box comprises a signal conversion circuit, a signal identification circuit and a logic control circuit, wherein the input end of the signal conversion circuit is connected with the pressure detection instrument, the temperature detection instrument and the hydrogen fluoride gas detection instrument, the output end of the signal conversion circuit is connected with the signal identification circuit, the output end of the signal identification circuit is connected with the logic control circuit, and the logic control circuit controls the electromagnetic valve, the air inlet buffer and the small cooler.
8. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 1, wherein: the specific steps of the air tightness detection in the step (4) are as follows: and filling nitrogen into the converter, wherein the nitrogen flows from the converter to each pipeline, detecting the air tightness of each structural position, and performing the next procedure after the air tightness is detected without errors.
9. The converter gas outlet method of the anhydrous hydrofluoric acid production line according to claim 1, wherein: and (5) after the washing in the step (6) is finished, taking out the solution in the converter, and purifying and filtering to obtain the hydrogen fluoride solution.
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| CN201810823214.7A CN109289444B (en) | 2018-07-25 | 2018-07-25 | Converter gas outlet method for anhydrous hydrofluoric acid production line |
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| CN201810823214.7A CN109289444B (en) | 2018-07-25 | 2018-07-25 | Converter gas outlet method for anhydrous hydrofluoric acid production line |
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| CN109289444B true CN109289444B (en) | 2021-01-15 |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US2296118A (en) * | 1940-04-08 | 1942-09-15 | Gen Chemical Corp | Process of producing hydrofluoric acid low in fluosilicic acid |
| JP4599673B2 (en) * | 2000-07-10 | 2010-12-15 | ダイキン工業株式会社 | Hydrogen fluoride production apparatus and production method |
| TW200412409A (en) * | 2003-01-03 | 2004-07-16 | Desiccant Technology Corp | Vortex-type reaction chamber toxic gas treatment device and method |
| JP2004352517A (en) * | 2003-05-27 | 2004-12-16 | Daikin Ind Ltd | Method and device for manufacturing hydrogen fluoride |
| CN201386023Y (en) * | 2009-04-24 | 2010-01-20 | 西安三瑞科技有限公司 | AHF or SiF4 rotary reaction furnace gas outlet washing device |
| JP5428594B2 (en) * | 2009-07-06 | 2014-02-26 | ダイキン工業株式会社 | Method for producing hydrogen fluoride |
| CN101700875A (en) * | 2009-12-04 | 2010-05-05 | 北京工业大学 | Purification system of anhydrous hydrogen fluoride gas |
| TWI525042B (en) * | 2010-09-16 | 2016-03-11 | 首威公司 | Hydrogen fluoride supply unit |
| CN205187846U (en) * | 2015-10-20 | 2016-04-27 | 福建龙氟化工有限公司 | Emergent air exhaust device of hydrogen fluoride reaction converter |
| CN207002251U (en) * | 2017-06-02 | 2018-02-13 | 江西中氟化工有限公司 | A kind of condenser system for hydrogen fluoride production |
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Inventor after: Hu Weimin Inventor after: Zhang Zhicheng Inventor after: Qin Xing Inventor before: Hu Weimin Inventor before: Zhang Zhicheng Inventor before: Qin Xing |
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Denomination of invention: A converter gas outlet method for anhydrous hydrofluoric acid production line Granted publication date: 20210115 Pledgee: China Construction Bank Corporation Wuyi Sub-branch Pledgor: ZHEJIANG MORITA NEW MATERIALS Co.,Ltd. Registration number: Y2024980008023 |