CN110965078A - Automatic control device for hydrogen fluoride feeding - Google Patents
Automatic control device for hydrogen fluoride feeding Download PDFInfo
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- CN110965078A CN110965078A CN201911258265.0A CN201911258265A CN110965078A CN 110965078 A CN110965078 A CN 110965078A CN 201911258265 A CN201911258265 A CN 201911258265A CN 110965078 A CN110965078 A CN 110965078A
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- valve
- stop valve
- hydrogen fluoride
- automatic control
- electrolytic cell
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/245—Fluorine; Compounds thereof
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention belongs to the technical field of electrolytic fluorine production, and particularly relates to an automatic control device for hydrogen fluoride feeding. The device includes: the device comprises a first stop valve 1, a mass flow meter 2, a second stop valve 3, a third stop valve 4, a fourth stop valve 5, a first pneumatic valve 6, a fifth stop valve 7, a sixth stop valve 8, a second pneumatic valve 9, a seventh stop valve 10, a third ball valve 11, a second solenoid valve 12, a first ball valve 14, a first solenoid valve 15, a second ball valve 16, a first electrolytic cell 171, a second electrolytic cell 172 and a DCS automatic control module 18. By using the device, the loss of hydrogen fluoride materials can be reduced, the stability of the process parameters of the electrolytic cell is improved, and the acidity is stabilized within the range of 38-42%. The service life of the carbon plate of the electrolytic cell can be prolonged by more than 30-50%. Continuous feeding of the electrolytic cell can be realized.
Description
Technical Field
The invention belongs to the technical field of electrolytic fluorine production, and particularly relates to an automatic control device for hydrogen fluoride feeding.
Background
In the field of fluorine production by electrolysis, two main techniques for supplying hydrogen fluoride are centralized and independent. In production practice, it is conventional to choose (gas or liquid phase centralized feed and individual feed) for the purpose of material balance and stable operation during the operation of the cell.
In the method, the AHF centralized feeding materials are difficult to measure and control stably, but the number of sets of the centralized feeding equipment is small, the material centralized safety coefficient is high, and the method is most suitable for automatic control.
In the conventional industrial production, the AHF of the electrolytic cell is intensively fed in a gas phase, the AHF is gasified in an evaporator and is conveyed to a distributor through a pipeline, and the AHF gas phase is supplied to a single electrolytic cell by the distributor after the pressure is adjusted.
In addition, the AHF centralized feeding method mainly comprises liquid phase centralized feeding in related enterprises at home and abroad by looking up documents and researching, the AHF liquid phase is stabilized by a pressure stabilizing tank, and the stabilized AHF is conveyed to a single electrolytic cell by a pipeline.
In the traditional technical scheme, because the probability of the operator contacting the AHF is higher, the automation level of the electrolytic cell is lower, and potential safety hazards exist on site.
In view of the above-mentioned shortcomings, it is desirable to develop an automatic control device for hydrogen fluoride supply, thereby solving the above-mentioned problems.
Disclosure of Invention
The invention aims to provide an automatic control device for hydrogen fluoride feeding, so that an AHF feeding method is optimized, the probability of contact of operators with the AHF is reduced, the automation level of an electrolytic cell is improved, and the potential safety hazard on site is reduced.
In order to realize the purpose, the invention adopts the technical scheme that:
an apparatus for automatically controlling a supply of hydrogen fluoride, the apparatus comprising:
the device comprises a first stop valve (1), a mass flow meter (2), a second stop valve (3), a third stop valve (4), a fourth stop valve (5), a first pneumatic valve (6), a fifth stop valve (7), a sixth stop valve (8), a second pneumatic valve (9), a seventh stop valve (10), a third stop valve (11), a second solenoid valve (12), a first ball valve (14), a first solenoid valve (15), a second ball valve (16), a first electrolytic cell (171), a second electrolytic cell (172) and a DCS automatic control module (18);
a first stop valve (1), a mass flow meter (2) and a second stop valve (3) are arranged in sequence from a hydrogen fluoride inlet;
a third stop valve (4) is arranged among the first stop valve (1), the mass flow meter (2) and the second stop valve (3) in parallel;
the rear part of the second stop valve (3) is divided into two paths, and one path is sequentially provided with a fourth stop valve (5), a first pneumatic valve (6) and a fifth stop valve (7); the other path is sequentially provided with a stop valve six (8), a pneumatic valve two (9) and a stop valve seven (10);
the pneumatic valve I (6) and the pneumatic valve II (9) are connected with the DCS automatic control module (18), and when the hydrogen fluoride feeding amount of a single electrolytic tank meets the requirement, the electrolytic tank is switched to the next electrolytic tank and is arranged at the inlet position of a feeding pipeline of the electrolytic tank;
the first path of nitrogen back-blowing pipeline is sequentially provided with a ball valve I (14), an electromagnetic valve I (15) and a ball valve II (16) from a nitrogen back-blowing inlet;
the second path of nitrogen back-blowing pipeline is sequentially provided with a ball valve III (11), an electromagnetic valve II (12) and a ball valve IV (13) from a nitrogen back-blowing inlet;
the ball valve I (14), the ball valve II (16), the ball valve III (11) and the ball valve IV (13) are used for manually cutting off a system channel when a system leaks or equipment fails;
the first electromagnetic valve (15) and the second electromagnetic valve (12) are connected with the DCS automatic control module (18);
the outlet of the ball valve IV (13) and the outlet pipeline of the stop valve V (7) are merged into a feeding pipeline of the first electrolytic cell and then are connected with the first electrolytic cell (171);
the outlet of the second ball valve (16) and the outlet pipeline of the seventh stop valve (10) are converged into a second electrolytic cell feeding pipeline and then are connected with a second electrolytic cell (172);
the first electrolytic cell (171) and the second electrolytic cell (172) are connected with the DCS automatic control module (18), and the current information of the first electrolytic cell (171) and the second electrolytic cell (172) is fed back to the DCS automatic control module (18).
Furthermore, the automatic control device for hydrogen fluoride feeding comprises a first stop valve (1), a second stop valve (3), a third stop valve (4), a fourth stop valve (5), a fifth stop valve (7), a sixth stop valve (8) and a seventh stop valve (10) which are used for manually cutting off a system channel when a system leaks or equipment fails.
Further, an automatic control device for hydrogen fluoride supply as described above, a mass flow meter (2) for measuring the amount of hydrogen fluoride to be added is installed at the inlet position of the hydrogen fluoride gas supply line.
Further, according to the automatic hydrogen fluoride feeding control device, the mass flow meter (2) is connected with the DCS automatic control module (18) and feeds back the hydrogen fluoride feeding condition to the DCS automatic control module (18).
Furthermore, the automatic control device for hydrogen fluoride feeding controls the switching of the first pneumatic valve (6) and the second pneumatic valve (9) through the DCS automatic control module (18).
Furthermore, the automatic control device for hydrogen fluoride feeding controls the opening and closing of the first electromagnetic valve (15) and the second electromagnetic valve (12) through the DCS automatic control module (18).
Furthermore, according to the automatic control device for hydrogen fluoride feeding, when the feeding amount of hydrogen fluoride in a single electrolytic cell meets the requirement, the pneumatic valve I (6) and the pneumatic valve II (9) are controlled to automatically switch, and nitrogen back flushing is carried out on the feeding pipeline of the electrolytic cell.
The technical scheme of the invention has the beneficial effects that:
1. provides an accurate hydrogen fluoride material metering method for the medium-temperature electrolytic cell.
2. The personnel remote operation stops the possibility of contact between the operators and the hydrogen fluoride, and improves the safety capability of the system.
3. By using the device, the loss of hydrogen fluoride materials can be reduced, the stability of the process parameters of the electrolytic cell is improved, and the acidity is stabilized within the range of 38-42%.
4. The device can prolong the service life of the carbon plate of the electrolytic cell by more than 30-50%.
5. By using the device, the continuous feeding of the electrolytic cell can be realized.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention.
In the figure: the device comprises a first stop valve (1), a mass flow meter (2), a second stop valve (3), a third stop valve (4), a fourth stop valve (5), a first pneumatic valve (6), a fifth stop valve (7), a sixth stop valve (8), a second pneumatic valve (9), a seventh stop valve (10), a third stop valve (11), a second solenoid valve (12), a first ball valve (14), a first solenoid valve (15), a second ball valve (16), a first electrolytic cell (171), a second electrolytic cell (172) and a DCS automatic control module (18).
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining the drawings and the specific embodiment.
As shown in fig. 1, the present invention provides an apparatus for automatically controlling a hydrogen fluoride supply, comprising:
the device comprises a first stop valve 1, a mass flow meter 2, a second stop valve 3, a third stop valve 4, a fourth stop valve 5, a first pneumatic valve 6, a fifth stop valve 7, a sixth stop valve 8, a second pneumatic valve 9, a seventh stop valve 10, a third ball valve 11, a second solenoid valve 12, a first ball valve 14, a first solenoid valve 15, a second ball valve 16, a first electrolytic cell 171, a second electrolytic cell 172 and a DCS automatic control module 18;
a first stop valve 1, a mass flow meter 2 and a second stop valve 3 are arranged in sequence from a hydrogen fluoride inlet;
a third stop valve 4 is arranged among the first stop valve 1, the mass flow meter 2 and the second stop valve 3 in parallel;
the rear part of the second stop valve 3 is divided into two paths, and one path is sequentially provided with a fourth stop valve 5, a pneumatic valve 6 and a fifth stop valve 7; the other path is sequentially provided with a stop valve six 8, a pneumatic valve two 9 and a stop valve seven 10;
the first pneumatic valve 6 and the second pneumatic valve 9 are connected with the DCS automatic control module 18, and when the hydrogen fluoride feeding amount of a single electrolytic tank meets the requirement, the electrolytic tank is switched to the next electrolytic tank and is arranged at the inlet position of a feeding pipeline of the electrolytic tank;
the first path of nitrogen back-blowing pipeline is sequentially provided with a ball valve I14, an electromagnetic valve I15 and a ball valve II 16 from a nitrogen back-blowing inlet;
the second path of nitrogen back-blowing pipeline is sequentially provided with a ball valve III 11, an electromagnetic valve II 12 and a ball valve IV 13 from a nitrogen back-blowing inlet;
the ball valve I14, the ball valve II 16, the ball valve III 11 and the ball valve IV 13 are used for manually cutting off a system channel when a system leaks or equipment fails;
the first electromagnetic valve 15 and the second electromagnetic valve 12 are connected with a DCS automatic control module 18;
the outlet of the ball valve IV 13 and the outlet pipeline of the stop valve V7 are converged into a feeding pipeline of the first electrolytic cell and then connected with the first electrolytic cell 171;
the outlet of the second ball valve 16 and the outlet pipeline of the stop valve seventh 10 are converged into a second electrolytic cell feeding pipeline and then are connected with a second electrolytic cell 172;
the first electrolytic cell 171 and the second electrolytic cell 172 are connected with the DCS automatic control module 18, and the current information of the first electrolytic cell 171 and the second electrolytic cell 172 is fed back to the DCS automatic control module 18;
the first stop valve 1, the second stop valve 3, the third stop valve 4, the fourth stop valve 5, the fifth stop valve 7, the sixth stop valve 8 and the seventh stop valve 10 are used for manually cutting off a system channel when a system leaks or equipment fails;
the mass flow meter 2 is used for measuring the adding amount of the hydrogen fluoride and is arranged at the inlet position of the hydrogen fluoride gas supply pipeline;
the mass flow meter 2 is connected with the DCS automatic control module 18 and feeds back the hydrogen fluoride feeding condition to the DCS automatic control module 18.
And the DCS automatic control module 18 is used for controlling the switching of the first air-operated valve 6 and the second air-operated valve 9.
The DCS automatic control module 18 controls the switches of the first electromagnetic valve 15 and the second electromagnetic valve 12, when the hydrogen fluoride feeding amount of a single electrolytic cell meets the requirement, the first pneumatic valve 6 and the second pneumatic valve 9 are controlled to be automatically switched, and nitrogen blowback is carried out on a feeding pipeline of the electrolytic cell.
Through the device, the hydrogen fluoride feed is controlled at the automatic feed control device, the feed rate is controlled to be less than 28kg/h, the gas phase feed is adopted in the feed mode, the feed pressure is 15-20 kPa, the intermittent feed is adopted, the feed is carried out for 2h per shift, and the acidity of the electrolytic cell is stabilized within 38-42% during the operation period through accurate control. The service life of the electrolytic cell is 9 months.
Claims (8)
1. An apparatus for automatically controlling a supply of hydrogen fluoride, comprising:
the device comprises a first stop valve (1), a mass flow meter (2), a second stop valve (3), a third stop valve (4), a fourth stop valve (5), a first pneumatic valve (6), a fifth stop valve (7), a sixth stop valve (8), a second pneumatic valve (9), a seventh stop valve (10), a third stop valve (11), a second solenoid valve (12), a first ball valve (14), a first solenoid valve (15), a second ball valve (16), a first electrolytic cell (171), a second electrolytic cell (172) and a DCS automatic control module (18);
a first stop valve (1), a mass flow meter (2) and a second stop valve (3) are arranged in sequence from a hydrogen fluoride inlet;
a third stop valve (4) is arranged among the first stop valve (1), the mass flow meter (2) and the second stop valve (3) in parallel;
the rear part of the second stop valve (3) is divided into two paths, and one path is sequentially provided with a fourth stop valve (5), a first pneumatic valve (6) and a fifth stop valve (7); the other path is sequentially provided with a stop valve six (8), a pneumatic valve two (9) and a stop valve seven (10);
the pneumatic valve I (6) and the pneumatic valve II (9) are connected with the DCS automatic control module (18), and when the hydrogen fluoride feeding amount of a single electrolytic tank meets the requirement, the electrolytic tank is switched to the next electrolytic tank and is arranged at the inlet position of a feeding pipeline of the electrolytic tank;
the first path of nitrogen back-blowing pipeline is sequentially provided with a ball valve I (14), an electromagnetic valve I (15) and a ball valve II (16) from a nitrogen back-blowing inlet;
the second path of nitrogen back-blowing pipeline is sequentially provided with a ball valve III (11), an electromagnetic valve II (12) and a ball valve IV (13) from a nitrogen back-blowing inlet;
the ball valve I (14), the ball valve II (16), the ball valve III (11) and the ball valve IV (13) are used for manually cutting off a system channel when a system leaks or equipment fails;
the first electromagnetic valve (15) and the second electromagnetic valve (12) are connected with the DCS automatic control module (18);
the outlet of the ball valve IV (13) and the outlet pipeline of the stop valve V (7) are merged into a feeding pipeline of the first electrolytic cell and then are connected with the first electrolytic cell (171);
the outlet of the second ball valve (16) and the outlet pipeline of the seventh stop valve (10) are converged into a second electrolytic cell feeding pipeline and then are connected with a second electrolytic cell (172);
the first electrolytic cell (171) and the second electrolytic cell (172) are connected with the DCS automatic control module (18), and the current information of the first electrolytic cell (171) and the second electrolytic cell (172) is fed back to the DCS automatic control module (18).
2. An apparatus for automatically controlling a hydrogen fluoride supply according to claim 1, wherein: the first stop valve (1), the second stop valve (3), the third stop valve (4), the fourth stop valve (5), the fifth stop valve (7), the sixth stop valve (8) and the seventh stop valve (10) are used for manually cutting off a system channel when a system leaks or equipment fails.
3. An apparatus for automatically controlling a hydrogen fluoride supply according to claim 1, wherein: the mass flow meter (2) is used for measuring the adding amount of the hydrogen fluoride and is arranged at the inlet position of the hydrogen fluoride gas supply pipeline.
4. An apparatus for automatically controlling a hydrogen fluoride supply according to claim 1, wherein: the mass flow meter (2) is connected with the DCS automatic control module (18) and feeds back the hydrogen fluoride feeding condition to the DCS automatic control module (18).
5. An apparatus for automatically controlling a hydrogen fluoride supply according to claim 1, wherein: and the DCS automatic control module (18) is used for controlling the switching of the first pneumatic valve (6) and the second pneumatic valve (9).
6. An apparatus for automatically controlling a hydrogen fluoride supply according to claim 1, wherein: the DCS automatic control module (18) is used for controlling the on-off of the first electromagnetic valve (15) and the second electromagnetic valve (12).
7. An apparatus for automatically controlling a hydrogen fluoride supply according to claim 1, wherein: and when the hydrogen fluoride feeding amount of a single electrolytic tank meets the requirement, the pneumatic valve I (6) and the pneumatic valve II (9) are controlled to automatically switch, and nitrogen back flushing is carried out on a feeding pipeline of the electrolytic tank.
8. The first stop valve (1), the second stop valve (3), the third stop valve (4), the fourth stop valve (5), the fifth stop valve (7), the sixth stop valve (8) and the seventh stop valve (10) are used for manually cutting off a system channel when a system leaks or equipment fails; the mass flow meter (2) is used for measuring the adding amount of the hydrogen fluoride and is arranged at the inlet position of the hydrogen fluoride gas supply pipeline; the mass flow meter (2) is connected with the DCS automatic control module (18) and feeds back the hydrogen fluoride feeding condition to the DCS automatic control module (18); the switching of the first pneumatic valve (6) and the second pneumatic valve (9) is controlled by a DCS automatic control module (18); the DCS automatic control module (18) is used for controlling the on-off of the first electromagnetic valve (15) and the second electromagnetic valve (12); and when the hydrogen fluoride feeding amount of a single electrolytic tank meets the requirement, the pneumatic valve I (6) and the pneumatic valve II (9) are controlled to automatically switch, and nitrogen back flushing is carried out on a feeding pipeline of the electrolytic tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258265.0A CN110965078A (en) | 2019-12-10 | 2019-12-10 | Automatic control device for hydrogen fluoride feeding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258265.0A CN110965078A (en) | 2019-12-10 | 2019-12-10 | Automatic control device for hydrogen fluoride feeding |
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| CN110965078A true CN110965078A (en) | 2020-04-07 |
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| CN201911258265.0A Pending CN110965078A (en) | 2019-12-10 | 2019-12-10 | Automatic control device for hydrogen fluoride feeding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430543A (en) * | 2021-07-08 | 2021-09-24 | 中核四0四有限公司 | Centralized feeding method for liquid hydrogen fluoride in fluorine-making electrolytic cell |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1502548A (en) * | 2002-11-20 | 2004-06-09 | ����̿����ʽ���� | Fluorine gas generator |
| CN101248216A (en) * | 2005-08-25 | 2008-08-20 | 东洋炭素株式会社 | Fluorogas generator |
| JP2009024222A (en) * | 2007-07-20 | 2009-02-05 | Toyo Tanso Kk | Apparatus for generating fluorine-based gas and hydrogen gas |
| CN102713011A (en) * | 2010-01-21 | 2012-10-03 | 中央硝子株式会社 | Fluorine gas generation device |
| CN106757145A (en) * | 2017-03-07 | 2017-05-31 | 洛阳黎明大成氟化工有限公司 | A kind of electrolytic cell automates feeding device and its application method with hydrogen fluoride |
| CN206918638U (en) * | 2017-10-26 | 2018-01-23 | 吉林奥克新材料有限公司 | A kind of interlock control apparatus of storage tank valve |
| CN108193221A (en) * | 2018-01-18 | 2018-06-22 | 洛阳森蓝化工材料科技有限公司 | A kind of preparation method containing fluorine mixed gas |
-
2019
- 2019-12-10 CN CN201911258265.0A patent/CN110965078A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1502548A (en) * | 2002-11-20 | 2004-06-09 | ����̿����ʽ���� | Fluorine gas generator |
| CN101248216A (en) * | 2005-08-25 | 2008-08-20 | 东洋炭素株式会社 | Fluorogas generator |
| JP2009024222A (en) * | 2007-07-20 | 2009-02-05 | Toyo Tanso Kk | Apparatus for generating fluorine-based gas and hydrogen gas |
| TW200918688A (en) * | 2007-07-20 | 2009-05-01 | Toyo Tanso Co | Apparatus for generating fluorine-based gas and hydrogen gas |
| CN102713011A (en) * | 2010-01-21 | 2012-10-03 | 中央硝子株式会社 | Fluorine gas generation device |
| CN106757145A (en) * | 2017-03-07 | 2017-05-31 | 洛阳黎明大成氟化工有限公司 | A kind of electrolytic cell automates feeding device and its application method with hydrogen fluoride |
| CN206918638U (en) * | 2017-10-26 | 2018-01-23 | 吉林奥克新材料有限公司 | A kind of interlock control apparatus of storage tank valve |
| CN108193221A (en) * | 2018-01-18 | 2018-06-22 | 洛阳森蓝化工材料科技有限公司 | A kind of preparation method containing fluorine mixed gas |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430543A (en) * | 2021-07-08 | 2021-09-24 | 中核四0四有限公司 | Centralized feeding method for liquid hydrogen fluoride in fluorine-making electrolytic cell |
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Application publication date: 20200407 |