CN114941802A - Automatic constant-pressure gas making and quantitative gas supply system and method for rare earth fluoride production - Google Patents
Automatic constant-pressure gas making and quantitative gas supply system and method for rare earth fluoride production Download PDFInfo
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- CN114941802A CN114941802A CN202210608149.2A CN202210608149A CN114941802A CN 114941802 A CN114941802 A CN 114941802A CN 202210608149 A CN202210608149 A CN 202210608149A CN 114941802 A CN114941802 A CN 114941802A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- -1 rare earth fluoride Chemical class 0.000 title claims abstract description 23
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000003682 fluorination reaction Methods 0.000 claims abstract description 22
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000008020 evaporation Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 59
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/10—Preparation or treatment, e.g. separation or purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/253—Halides
- C01F17/265—Fluorides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/20—Arrangements or systems of devices for influencing or altering dynamic characteristics of the systems, e.g. for damping pulsations caused by opening or closing of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention provides an automatic constant-pressure gas-making and quantitative gas-supplying system for rare earth fluoride production, which comprises: a large storage tank for storing HF; the intermediate tank is connected with the large storage tank through a pipeline; the gas making tank is connected with the intermediate tank through a pipeline and is used for evaporating HF entering the interior of the intermediate tank; the buffer tank is connected with the gas making tank through a pipeline and is used for storing and introducing gasified HF into the fluorination furnace; the buffer tank and the gas making tank are also connected with a hot water tank; for introducing hot water to heat and gasify HF into gas state.
Description
Technical Field
The invention relates to the technical field of rare earth fluoride production, in particular to an automatic constant-pressure gas-making and quantitative gas-supplying system and method for rare earth fluoride production.
Background
During the production of rare earth fluorides, manufacturers often need to supply HF to the fluorination furnace.
Traditional fluoride rare earth producer's production adopts HF to remove the steel bottle and directly supplies liquid for the fluoride furnace, because steel bottle internal pressure constantly reduces, needs artifical continuous operation valve, has HF liquid injection danger, and pressure is on the high side and unstable simultaneously, and the excess rate is high, and is extravagant serious, increases raw materials for production cost, still needs the external heating steel bottle just can emit liquid winter day-time, seriously influences production.
Therefore, in order to safely and controllably perform production, it is imperative to optimize the manner in which HF is supplied.
Disclosure of Invention
In view of this, the present invention provides an automatic constant pressure gas generation and quantitative gas supply system and method for rare earth fluoride production, so as to solve the above mentioned technical problems.
The technical purpose of the invention is realized by the following scheme:
in one aspect of the present disclosure, an automatic constant pressure gas generation and quantitative gas supply system for rare earth fluoride production is disclosed, comprising:
a large storage tank for storing HF;
the intermediate tank is connected with the large storage tank through a pipeline;
the gas making tank is connected with the intermediate tank through a pipeline and is used for evaporating HF entering the interior;
the buffer tank is connected with the gas making tank through a pipeline and is used for storing and introducing gasified HF into the fluorination furnace;
the buffer tank and the jacket of the gas making tank are also connected with a hot water tank; is used for introducing hot water to heat and gasify the HF in the tank body into a gas state.
Furthermore, a shield pump is arranged on a connecting pipeline of the large storage tank and the intermediate tank;
the connecting pipeline of the intermediate tank and the gas making tank is provided with the shielding pump.
Further, the large storage tank and the intermediate tank are provided with liquid level meters to measure the delivery amount and storage amount of HF.
Further, the system also comprises a DCS control system;
the hot water tank is provided with a hot water pump;
the hot water pump is driven by a frequency converter;
the buffer tank and the gas making tank are provided with pressure transmitters;
the hot water pump and the pressure transmitter are connected with the DCS control system;
the DCS control system is provided with a PID logic module, and the PID logic module adjusts the rotating speed of the hot water pump according to the information fed back by the pressure transmitter so as to adjust the entering amount of hot water, thereby controlling the evaporation amount of HF in the gas making tank and ensuring the pressure fluctuation in the tank to be stable.
Furthermore, a flow meter and a pneumatic regulating valve are arranged on a pipeline of the buffer tank, which is introduced into the fluorination furnace;
the flowmeter and the pneumatic control valve are connected with the DCS control system, and the pneumatic control valve is regulated according to a set flow value through the PID logic module so as to realize quantitative supply.
Further, a connecting pipeline of the buffer tank and the gas making tank is provided with an air inlet valve;
the air inlet valve is connected with the DCS control system;
and the PID logic module is also used for adjusting the opening of the air inlet valve according to the information fed back by the pressure transmitter so as to adjust the pressure in the buffer tank.
In another aspect of the disclosure, an automatic constant pressure gas making and quantitative gas supply method for rare earth fluoride production is disclosed, which comprises the following steps:
delivering HF from the bulk storage tank to the intermediate tank according to demand;
delivering HF from the intermediate tank to a gas generating tank;
hot water is circularly introduced into a gas making tank jacket to heat and gasify HF;
conveying the gasified HF to a buffer tank;
hot water is circularly introduced into a buffer tank jacket, so that the gasified HF keeps in a gaseous state;
introducing gasified HF into the fluorination furnace from the buffer tank;
and the PID logic module adjusts the rotating speed of the hot water pump according to the information fed back by the pressure transmitter so as to adjust the entering amount of hot water and further control the evaporation amount of HF in the buffer tank.
Further, hot water is circularly introduced into the gas making tank jacket to heat so as to gasify HF,
and the PID logic module also adjusts the opening of the air inlet valve according to the information fed back by the pressure transmitter so as to adjust the pressure in the buffer tank.
Further, introducing gasified HF into a fluorination furnace,
and the pneumatic regulating valve is regulated through the PID logic module according to the set flow value so as to realize quantitative supply.
The beneficial effects of the invention are as follows:
gasifying HF in the gas making tank into a buffer tank by a heating mode of circularly introducing hot water into a gas making tank jacket, keeping the state of the gasified HF by the buffer tank jacket in a heating mode of circularly introducing hot water, and quantitatively conveying gaseous HF to the fluorination furnace by a DCS (distributed control system); in addition, through the rotational speed of DCS control system can be through dynamic adjustment hot-water pump to adjust the hot-water admission volume, thereby play the effect of adjustment HF evaporation capacity, stabilize the atmospheric pressure in the buffer tank with this, thereby reach the purpose that the gas was made to the constant pressure, ration air feed.
Drawings
FIG. 1 is a schematic structural diagram of an automatic constant-pressure gas-making and quantitative gas-supplying system for rare earth fluoride production;
FIG. 2 is a control logic diagram of the DCS control system;
FIG. 3 is a schematic logic flow diagram of a pressure isopiestic regulation;
fig. 4 is a logic diagram of constant flow regulation.
1. A large storage tank; 2. an intermediate tank; 3. a gas making tank; 4. a buffer tank; 5. a hot water tank; 6. a canned pump; 7. a hot water pump; 8. a pneumatic regulating valve; 9. an intake valve.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1 to 4, in one aspect of the present disclosure, an automatic constant pressure gas-making and quantitative gas supply system for rare earth fluoride production is disclosed, comprising:
a large storage tank 1 for storing HF;
the intermediate tank 2 is connected with the large storage tank 1 through a pipeline;
the gas making tank 3 is connected with the intermediate tank 2 through a pipeline and is used for evaporating HF entering the interior;
the buffer tank 4 is connected with the gas making tank 3 through a pipeline and is used for storing and introducing gasified HF into the fluorination furnace;
the buffer tank 4 and the jacket of the gas making tank 3 are also connected with a hot water tank 5; for introducing hot water to heat and gasify HF into a gaseous state.
Specifically, the large storage tank 1 is provided with a jacket or a coil pipe and needs to be circulated with a secondary refrigerant to keep the temperature below the evaporation temperature of HF; the intermediate tank 2 is provided with a jacket and needs to be circularly introduced with secondary refrigerant to keep the temperature below the HF evaporation temperature; hot water with a certain temperature is circularly led into the gas making tank 3 from the jacket, and the HF is evaporated by heating; the buffer tank 4 is used for circularly introducing hot water with a certain temperature from the jacket to ensure that the evaporated HF keeps a gaseous state and cannot be liquefied; the hot water tank 3 is provided with a high-power heating tube, and the certain temperature of the hot water tank is controlled by a temperature controller. The jacket is a jacket layer arranged on the wall of each tank body, and the temperature inside the tank body is controlled by introducing substances with other temperatures.
In some embodiments, the connecting pipeline of the large storage tank 1 and the intermediate tank 2 is provided with a canned motor pump 6;
the connecting pipeline of the intermediate tank 2 and the gas making tank 3 is provided with a shielding pump 6.
By adopting the technical scheme, anhydrous HF is conveyed through the shield pump 6.
In some embodiments, both the large tank 1 and the intermediate tank 2 are provided with level gauges to gauge the amount of HF delivered and stored.
By adopting the technical scheme, the storage capacity of HF in the large storage tank 1 and the intermediate tank 2 can be known through the liquid level meter, and the conveying capacity can be obtained by comparing the metering values before and after the liquid level meter is conveyed.
In some embodiments, the system further comprises a DCS control system;
the hot water tank 5 is provided with a hot water pump 7;
the hot water pump 7 is driven by a frequency converter;
the buffer tank 4 and the gas making tank 3 are provided with pressure transmitters;
the hot water pump 7 and the pressure transmitter are connected with a DCS control system;
the DCS control system is provided with a PID logic module, and the PID logic module adjusts the rotating speed of the hot water pump 7 according to the information fed back by the pressure transmitter so as to adjust the entering amount of hot water, thereby controlling the evaporation amount of HF in the gas making tank 3 and ensuring the pressure fluctuation in the tank to be stable.
The buffer tank 4 and the gas making tank 3 are both provided with pressure transmitters to acquire pressure value information in the corresponding tanks.
By adopting the technical scheme, the hot water pump 7 is driven by a frequency converter, and the analog input of the frequency converter and the pressure transmitter of the gas making tank 3 are matched together in a DCS control system to carry out constant-pressure regulation and control. Setting a pressure value through a DCS control system, if the pressure value detected by a pressure transmitter of the gas making tank 3 is greater than the set value, controlling to reduce the rotating speed of the hot water pump 7 through a PID logic module by the DCS control system so as to reduce the introduction amount of hot water, thereby reducing the evaporation amount of HF in the gas making tank 3 and adapting to reduce the pressure in the gas making tank 3; if the pressure value that makes the pressure transmitter of gas pitcher 3 and detect is less than the setting value, then DCS control system will suitably promote the rotational speed of hot-water pump 7 through PID logic module control to increase the volume of letting in of hot water, thereby the adaptation increases the evaporation capacity of HF in making the gas pitcher 3, in order to adapt to the pressure that increases in making the gas pitcher 3, above-mentioned process is the dynamic process of circulation regulation and control, through constantly finely tuning, makes pressure invariable.
It should be noted that, as shown in fig. 3, the DCS control system can receive the pressure value information (PT) detected by the pressure transmitter and the rotation Speed Information (SI) of the hot water pump 7, and output the adjusted rotation Speed (SV) of the hot water pump 7 under the operation program of the PID logic module. Where PV denotes a process measurement value, TRKVAL denotes a tracking amount point, Q denotes information quality, OUT denotes an output, SP denotes a set value, and TRKSW denotes a tracking switch.
In some embodiments, the buffer tank 4 is provided with a flow meter and a pneumatic regulating valve 8 in the pipeline leading into the fluorination furnace;
the flowmeter and the pneumatic control valve 8 are connected with a DCS control system, and the pneumatic control valve 8 is adjusted according to the set flow value through a PID logic module so as to realize quantitative supply.
By adopting the technical scheme, the flow rate of HF introduced into the corresponding fluorination furnace can be known through the flow meter, and the conveying is controlled by controlling the opening and closing of the pneumatic regulating valve 8. The supply amount of the gaseous HF is set by the DCS control system, and the DCS control system controls the corresponding pneumatic regulating valve 8 to be closed after the flow reaches a set value, so that the purpose of quantitative supply is achieved.
It should be noted that, as shown in fig. 4, the DCS control system can receive the flow data information and the flow quality information of the flow meter, and output the execution result of the pneumatic control valve 8 under the operation program of the PID logic module. Where PV denotes a process measurement value, TRKVAL denotes a tracking amount point, Q denotes information quality, OUT denotes an output, SP denotes a set value, and TRKSW denotes a tracking switch.
In some embodiments, the connecting pipeline of the buffer tank 4 and the gas generating tank 3 is provided with an air inlet valve 9;
the air inlet valve 9 is connected with a DCS control system;
the PID logic module also adjusts the opening of the air inlet valve 9 according to the information fed back by the pressure transmitter so as to adjust the pressure in the buffer tank 4.
By adopting the technical scheme, the amount of the gaseous HF entering the buffer tank 4 from the gas making tank 3 can be controlled by adjusting the opening degree of the air inlet valve 9, so that the pressure in the buffer tank 4 is controlled and adjusted, the pressure value is set by the DCS control system, and if the pressure value detected by the pressure transmitter of the buffer tank 4 is greater than the set value, the DCS control system reduces the opening degree of the air inlet valve 9 through the control of the PID logic module so as to reduce the entering amount, so that the pressure in the buffer tank 4 is reduced; if the pressure value detected by the pressure transmitter of the buffer tank 4 is smaller than the set value, the DCS control system controls and adapts to increase the opening of the air inlet valve 9 through the PID logic module. The pressure in the buffer tank 4 is increased by increasing the entering amount so as to adapt to the increase, and the process is a dynamic process of cyclic regulation and control and is constant through continuous fine adjustment. It should be noted that the adjustment process and the process of regulating the rotation speed of the hot water pump 7 are coordinated with each other.
In another aspect of the present disclosure, an automatic constant pressure gas making and quantitative gas supply method for rare earth fluoride production is disclosed, comprising the following steps:
delivering HF from the bulk storage tank to the intermediate tank according to demand;
delivering HF from the intermediate tank to a gas generating tank;
hot water is circularly introduced into a gas making tank jacket to heat and gasify HF;
conveying the gasified HF to a buffer tank;
hot water is circularly introduced into a buffer tank jacket, so that the gasified HF keeps in a gaseous state;
introducing gasified HF into the fluorination furnace from the buffer tank;
and the PID logic module adjusts the rotating speed of the hot water pump according to the information fed back by the pressure transmitter so as to adjust the entering amount of hot water and further control the evaporation amount of HF in the buffer tank.
Further, hot water is circularly introduced into the gas making tank jacket to heat so as to gasify HF,
and the PID logic module also adjusts the opening of the air inlet valve according to the information fed back by the pressure transmitter so as to adjust the pressure in the buffer tank.
Further, introducing gasified HF into a fluorination furnace,
and the pneumatic regulating valve is regulated through the PID logic module according to the set flow value so as to realize quantitative supply.
More specifically, first, anhydrous hydrogen fluoride was transferred from the large storage tank 1 to the intermediate tank 2 via a SUS316L stainless steel branch pipe of DN40, and a level meter was provided to measure the storage amount of anhydrous hydrogen fluoride. HF is conveyed to the evaporating pot 3 from the intermediate tank 2 through the shield pump 6 and the pipeline, and a liquid level meter is arranged to measure the conveying amount and the storage amount of anhydrous hydrogen fluoride. The level gauges of the large storage tank 1 and the intermediate tank 2 are interlocked and cut off with the shut-off valves of the feed pipe ports of the HF pipelines. And (3) heating and gasifying the HF in the tank 3 by hot water to obtain gas at the gasification temperature of 50-70 ℃. Enters the buffer tank 4 through the air inlet valve 9 and then enters the fluorination furnace from the buffer tank 4 through the pneumatic adjusting valve 88 and the flowmeter.
The hot water pump 7 is driven by a frequency converter, and the analog quantity input of the frequency converter and the pressure transmitter of the gas making tank 3 are matched together in a DCS control system for constant-pressure regulation and control. Setting a pressure value through a DCS control system, if the pressure value detected by a pressure transmitter of the gas making tank 3 is greater than the set value, controlling to reduce the rotating speed of the hot water pump 7 through a PID logic module by the DCS control system so as to reduce the introduction amount of hot water, thereby reducing the evaporation amount of HF in the gas making tank 3 and adapting to reduce the pressure in the gas making tank 3; if the pressure value that makes the pressure transmitter of gas pitcher 3 and detect is less than the setting value, then DCS control system will suitably promote the rotational speed of hot-water pump 7 through PID logic module control to increase the volume of letting in of hot water, thereby the adaptation increases the evaporation capacity of HF in making the gas pitcher 3, in order to adapt to the pressure that increases in making the gas pitcher 3, above-mentioned process is the dynamic process of circulation regulation and control, through constantly finely tuning, makes pressure invariable.
The flow rate of HF introduced into the corresponding fluorination furnace can be known by a flow meter, and the conveyance is controlled by controlling the opening and closing of the pneumatic control valve 8. The supply amount of the gaseous HF is set by the DCS control system, and the DCS control system controls the corresponding pneumatic regulating valve 8 to be closed after the flow reaches a set value, so that the purpose of quantitative supply is achieved.
The opening of the air inlet valve 9 is adjusted to control the amount of the gaseous HF entering the buffer tank 4 from the gas making tank 3, so that the pressure in the buffer tank 4 is controlled and adjusted, a pressure value is set by the DCS control system, and if the pressure value detected by the pressure transmitter of the buffer tank 4 is greater than the set value, the DCS control system controls to reduce the opening of the air inlet valve 9 through a PID logic module to reduce the entering amount, so that the pressure in the buffer tank 4 is reduced; if the pressure value detected by the pressure transmitter of the buffer tank 4 is smaller than the set value, the DCS control system controls and adapts to increase the opening of the air inlet valve 9 through the PID logic module. The pressure in the buffer tank 4 is increased by increasing the entering amount, and the process is a dynamic process of circular regulation and control and is constant through continuous fine adjustment. It should be noted that the adjusting process and the process of regulating the rotation speed of the hot water pump 7 are mutually cooperated, so that the rotation speed of the hot water pump 7 is not unreasonably too fast or too slow, and the opening of the air inlet valve 9 is not too large or too small, and both states can be in a stable operation production range.
The fluorination reaction device is supplied with gas through the system, so that the randomness of manual operation is reduced, the automatic and scientific control of constant pressure and quantification is realized, the production safety is improved, the excess rate of HF gas is reduced, the waste is reduced, and the good economy is realized.
Reference may be made to table 1 below, which shows the data of the conventional liquid supply method and the quantitative constant pressure gas generation method of the present application in actual production.
TABLE 1
Note: the material ratio refers to the weight ratio of fluoride to fluoride of unit oxide, namely the ratio of the weight of the fluoride divided by the weight of the oxide, and the higher the material ratio, the better the fluorination degree.
As can be seen from the above table, the excess rate of HF gas in the fluorination reaction was reduced from 40% to 19%, the feed ratio was also increased by 0.019, and the fluorination rate was increased from 97.59% to 99.23%.
It should be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. The utility model provides a gas, quantitative gas supply system are made to automatic constant voltage of rare earth fluoride production which characterized in that includes:
a large storage tank for storing HF;
the intermediate tank is connected with the large storage tank through a pipeline;
the gas making tank is connected with the intermediate tank through a pipeline and is used for evaporating HF entering the interior;
the buffer tank is connected with the gas making tank through a pipeline and is used for storing and introducing gasified HF into the fluorination furnace;
the buffer tank and the jacket of the gas making tank are also connected with a hot water tank; the HF in the tank body is gasified into gas state by introducing hot water for heating.
2. The automatic constant-pressure gas-making and quantitative gas-supplying system for rare earth fluoride production according to claim 1, characterized in that:
a shield pump is arranged on a connecting pipeline of the large storage tank and the intermediate tank;
the connecting pipeline of the intermediate tank and the gas making tank is provided with the shielding pump.
3. The automatic constant-pressure gas-making and quantitative gas-supplying system for rare earth fluoride production according to claim 2, characterized in that:
the large storage tank and the intermediate tank are both provided with liquid level meters so as to measure the delivery volume and the storage volume of HF.
4. The automatic constant-pressure gas-making and quantitative gas-supplying system for rare earth fluoride production according to claim 1, characterized in that:
the system further comprises a DCS control system;
the hot water tank is provided with a hot water pump;
the hot water pump is driven by a frequency converter;
the buffer tank and the gas making tank are provided with pressure transmitters;
the hot water pump and the pressure transmitter are both connected with the DCS control system;
the DCS control system is provided with a PID logic module, and the PID logic module adjusts the rotating speed of the hot water pump according to the information fed back by the pressure transmitter so as to adjust the entering amount of hot water, thereby controlling the evaporation amount of HF in the gas making tank and ensuring the pressure fluctuation in the tank to be stable.
5. The automatic constant-pressure gas-making and quantitative gas supply system for rare earth fluoride production according to claim 4, characterized in that:
the buffer tank is provided with a flowmeter and a pneumatic regulating valve in a pipeline leading into the fluorination furnace;
the flowmeter and the pneumatic control valve are connected with the DCS control system, and the pneumatic control valve is adjusted according to a set flow value through the PID logic module so as to realize quantitative supply.
6. The automatic constant-pressure gas-making and quantitative gas-supplying system for rare earth fluoride production according to claim 4, characterized in that:
an air inlet valve is arranged on a connecting pipeline of the buffer tank and the gas making tank;
the air inlet valve is connected with the DCS control system;
and the PID logic module is also used for adjusting the opening of the air inlet valve according to the information fed back by the pressure transmitter so as to adjust the pressure in the buffer tank.
7. An automatic constant pressure gas-making and quantitative gas-supplying method for rare earth fluoride production, which uses the automatic constant pressure gas-making and quantitative gas-supplying system for rare earth fluoride production as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
delivering HF from the bulk storage tank to the intermediate tank according to demand;
delivering HF from the intermediate tank to a gas generating tank;
hot water is circularly introduced into a gas making tank jacket to heat and gasify HF;
conveying the gasified HF to a buffer tank;
hot water is circularly introduced into a buffer tank jacket, so that the gasified HF keeps in a gaseous state;
introducing gasified HF into the fluorination furnace from the buffer tank;
and the PID logic module adjusts the rotating speed of the hot water pump according to the information fed back by the pressure transmitter so as to adjust the entering amount of hot water, thereby controlling the evaporation amount and pressure of HF in the buffer tank.
8. The method for automatic constant-pressure gas generation and quantitative gas supply in rare earth fluoride production according to claim 7, wherein the method comprises the following steps:
circulating hot water into a gas making tank jacket to heat and gasify HF,
and the PID logic module also adjusts the opening of the air inlet valve according to the information fed back by the pressure transmitter so as to adjust the pressure in the buffer tank.
9. The method for automatic constant-pressure gas generation and quantitative gas supply in rare earth fluoride production according to claim 7, wherein the method comprises the following steps:
introducing gasified HF into a fluorination furnace,
and the pneumatic regulating valve is regulated through the PID logic module according to the set flow value so as to realize quantitative supply.
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