Anhydrous hydrogen fluoride storage and enclosed unloading system for industry

Abstract

The utility model discloses anhydrous hydrogen fluoride storage and closed unloading system for industry, which aims to ensure efficient and stable completion of unloading task in the process of unloading anhydrous hydrogen fluoride and to minimize potential safety hazards. The closed system reduces the risk of leakage and improves safety. The water absorption tower and the alkali absorption tower are set to ensure that the tail gas meets the emission standards and protect the environment. The diaphragm compressor is used to improve the unloading efficiency. The PLC controller realizes automatic control and ensures stable operation. The perfect tail gas treatment and interlocking protection mechanism prolong the service life of the equipment. This technology significantly improves the safety and environmental performance of chemical enterprises.

Description

Technical Field

[0001] This utility model belongs to the field of chemical industry, specifically to the field of anhydrous hydrogen fluoride transfer technology, and relates to an industrial anhydrous hydrogen fluoride storage and closed unloading system. Background Technology

[0002] Anhydrous hydrogen fluoride (AHF), as a chemical raw material, is widely used in many important industries such as aluminum smelting, refrigerant production, and semiconductor manufacturing. Its unique chemical properties make it play a crucial role in numerous industrial processes. However, anhydrous hydrogen fluoride is highly volatile and corrosive, posing serious safety challenges during transportation and storage. Leaks can not only pollute the environment but also threaten the safety of operators and surrounding communities. Especially in chemical plants, due to incomplete supply chain cycles, many companies have to rely on purchasing anhydrous hydrogen fluoride and transporting it to the site via tank trucks. Frequent unloading operations significantly increase the risk of safety accidents; leaks could lead to the spread of toxic gases, and explosions could have catastrophic consequences. Therefore, developing a safe and reliable anhydrous hydrogen fluoride storage and closed-loop unloading process technology is crucial for ensuring safe production and environmental protection in chemical enterprises.

[0003] To address these challenges, designing and implementing an advanced anhydrous hydrogen fluoride storage and closed-loop unloading system is particularly urgent. This system must not only ensure efficient and stable unloading but also minimize potential safety hazards. By introducing equipment such as diaphragm compressors, gas-liquid separators, and water and alkali absorption towers, exhaust gases can be effectively treated, preventing harmful substances from being released into the environment. Furthermore, automated control using a PLC controller allows for real-time monitoring and adjustment of various parameters, ensuring safe system operation. A robust interlocking protection mechanism and nitrogen purging procedure further enhance system reliability and reduce the impact of human factors. Ultimately, this innovative process technology not only improves the safety of chemical enterprises in anhydrous hydrogen fluoride treatment but also provides solid technical support for environmental protection and fulfilling social responsibility. Utility Model Content

[0004] This utility model provides an industrial anhydrous hydrogen fluoride storage and closed unloading system, which aims to ensure efficient and stable completion of the unloading task during the anhydrous hydrogen fluoride unloading process, while minimizing potential safety hazards.

[0005] Therefore, the present invention adopts the following technical solution: An industrial anhydrous hydrogen fluoride storage and closed-loop unloading system, the unloading system comprising the following structure: (a) The top of the hydrogen fluoride storage tank is connected to a gas-liquid separator via a pipeline, and the outlet of the gas-liquid separator is connected to the inlet of the diaphragm compressor; The function of the gas-liquid separator is to separate the liquid hydrogen fluoride carried in the pipeline during the operation of the compressor. The gas-liquid separator is equipped with a nitrogen valve. After unloading, the liquid hydrogen fluoride in the gas-liquid separator is pressurized to the hydrogen fluoride storage tank. (b) The outlet of the diaphragm compressor is connected to the tank truck through a pipeline. Valves are installed in sequence on the pipeline. A tee is installed at the rear end of the valve to connect the pipeline to the compressor inlet pipeline. A regulating valve is installed on the pipeline to control the compressor backflow and facilitate the adjustment of the compressor outlet pressure. A pressure transmitter is installed on the pipeline to facilitate the monitoring of the unloading pressure. A valve is installed after the pressure transmitter and connected to the tank truck through a flange. (c) Install a nitrogen pipeline on the pipeline before the pipeline pressure transmitter and install a valve on the nitrogen pipeline for control, so as to facilitate purging after unloading; (d) A gas phase pipe is installed at the top of the hydrogen fluoride storage tank, and a valve is installed on the gas phase pipe for control. The other end of the gas phase pipe is connected to the water absorption tower. A gas phase pipe is installed at the top of the water absorption tower, and a temperature sensor T is installed on the gas phase pipe to facilitate monitoring of the absorption temperature. Then, the gas phase pipe is connected to the alkali absorption tower for absorption. (e) A pipeline is installed at the outlet of the alkali absorption tower to connect to the tail gas fan, and an exhaust pipe G7 is installed at the outlet of the tail gas fan for nitrogen discharge; (f) Set the PLC controller to be interlocked with the hydrogen fluoride storage tank level gauge, regulating valve, pressure transmitter, and diaphragm compressor. The interlock logic is as follows: 1) When the hydrogen fluoride storage tank level gauge reaches 80%, the regulating valve is closed and the diaphragm compressor stops running. 2) When the pressure transmitter exceeds the set value, the regulating valve is opened to adjust the compressor discharge pressure to stabilize.

[0006] The unloading process includes the following steps: 1) Connect the diaphragm compressor exhaust pipe to the tank truck through a valve, and connect the tank truck outlet pipe to the hydrogen fluoride storage tank through regulating valve F2; 2) Close the valves and turn on the water absorption pump, alkali absorption pump, and exhaust gas fan to ensure operation under slight negative pressure; 3) Open the valves on the compressor's inlet and outlet pipes, start the diaphragm compressor to begin unloading, and put the interlock into operation; 4) After unloading, close the valve and open the nitrogen valve to purge the hydrogen fluoride in the tank truck and pipeline into the hydrogen fluoride tank; open the nitrogen valve to purge the liquid phase hydrogen fluoride in the gas-liquid separator into the hydrogen fluoride storage tank. (5) Open the valve during the purging process, close the purging nitrogen after purging for a period of time, and observe the temperature sensor T. When the temperature shows an obvious upward trend, it indicates that the nitrogen in the hydrogen fluoride storage tank has been completely discharged, and the vaporized hydrogen fluoride enters the water absorption tower, causing the temperature to rise.

[0007] Furthermore, the water absorption tower is made of steel lined with PTFE material, filled with PP Pall rings, and equipped with a water absorption pump at the bottom. A primary water supply pipeline and valve are installed in the bottom of the water absorption tower. Primary water is added to the water absorption tower to the specified liquid level, and the water absorption pump is turned on. The acid is sprayed through the acid pipeline and circulated with the gas phase entering from the bottom of the tower for absorption. When the concentration of hydrofluoric acid in the water absorption tower is high, it is transported to the tank area for storage through the pipeline.

[0008] Furthermore, the alkali absorption tower is made of steel lined with PTFE material, filled with PP Pall rings, and equipped with an alkali absorption pump at the bottom. Caustic soda pipelines and valves are installed in the bottom of the alkali absorption tower. Caustic soda is added into the alkali absorption tower to the specified liquid level, and the alkali absorption pump is turned on. The alkali is sprayed through the alkali pipeline and circulated with the gas phase entering from the bottom of the tower for absorption. When the alkali concentration in the alkali absorption tower is high, it is transported to the tank area for storage through pipelines.

[0009] The components included in this utility model system Hydrogen fluoride storage tank: Used to store anhydrous hydrogen fluoride.

[0010] Gas-liquid separator: Separates liquid hydrogen fluoride carried in pipeline G1 during the operation of the diaphragm compressor.

[0011] Tanker truck: Used to transport anhydrous hydrogen fluoride to the site.

[0012] Water absorption tower: Made of steel lined with PTFE, filled with PP Pall rings, and equipped with a water absorption pump at the bottom, it absorbs hydrogen fluoride in the gas phase through primary water spraying.

[0013] Alkali absorption tower: It is also made of steel lined with PTFE, filled with PP Pall rings, and equipped with an alkali absorption pump at the bottom to further absorb residual gas through caustic soda B solution.

[0014] PLC controller: Enables automated control and ensures the safe and stable operation of the system.

[0015] Exhaust gas fan: Used to discharge treated exhaust gas into the atmosphere.

[0016] Diaphragm compressor: Used to generate a pressure differential to pressurize anhydrous hydrogen fluoride from tank trucks to hydrogen fluoride storage tanks.

[0017] F1, F2 - Control valves: used to adjust parameters such as flow rate and pressure.

[0018] F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, F13 - Valves: Used to control the opening and closing of different pipelines.

[0019] Nitrogen: Used to purge the system to ensure no residue remains.

[0020] Primary water: used for spray absorption within the water absorption tower.

[0021] Caustic soda: Used for spray absorption in alkali absorption towers.

[0022] G1-G11 Pipes: Connect various devices to ensure smooth fluid flow.

[0023] The working principle of this utility model is as follows: A diaphragm compressor is used to depressurize the hydrogen fluoride storage tank by drawing in air, and then the compressor discharges gas to pressurize the tank truck. The pressure difference generated by the compressor is used to pressurize the anhydrous hydrogen fluoride from the tank truck to the hydrogen fluoride storage tank. After unloading, nitrogen is used to purge the tank truck and pipelines. The purged nitrogen enters the hydrogen fluoride storage tank, then passes through a water absorption tower and an alkali absorption tower before being discharged through a tail gas fan.

[0024] A gas phase pipeline G4 is installed at the top of the hydrogen fluoride storage tank, connecting to a water absorption tower. The hydrogen fluoride in the gas phase is absorbed by primary water spraying (W) within the water absorption tower. The absorbed gas is then further treated in an alkali absorption tower before being finally discharged by a tail gas fan.

[0025] The PLC controller is interlocked with the hydrogen fluoride storage tank level gauge, regulating valve F1, regulating valve F2, pressure transmitter, and compressor to ensure safe system operation.

[0026] The beneficial effects of this utility model are as follows: This invention reduces leakage risk and improves safety through a closed system; it ensures that exhaust gas meets emission standards by incorporating water and alkali absorption towers, protecting the environment; it uses a diaphragm compressor to improve unloading efficiency; a PLC controller enables automated control, ensuring stable operation; and a comprehensive exhaust gas treatment and interlocking protection mechanism extends equipment lifespan. This technology significantly improves the safety and environmental performance of chemical enterprises. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1-Hydrogen fluoride tank; 2-Gas-liquid separator; 3-Tank truck; 4-Water absorption tower; 5-Alkali absorption tower; 6-Water absorption pump; 7-Alkali absorption pump; 8-PLC controller; 9-Tail gas fan; Y-Diaphragm compressor; F1-Regulating valve; F2-Regulating valve; F3-Valve; F4-Valve; F5-Valve; F6-Valve; F7-Valve; F8-Valve; F9-Valve; F10-Valve; F11-Valve; F12-Valve; F13-Valve; F10-Valve; W-Primary water; B-Caustic soda pipeline; N-Nitrogen pipeline; G1-Pipeline; G2-Pipeline; G3-Pipeline; G4-Gas phase pipe; G5-Gas phase pipe; G6-Gas phase pipe; G7-Vent pipe; G8-Acid pipe; G9-Acid pipe; G10-Alkali pipe; G11-Alkali pipe. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: A process technology for storing and unloading anhydrous hydrogen fluoride for industrial use, comprising the following structure: (a) The top of the hydrogen fluoride storage tank 1 is connected to the gas-liquid separator 2 via pipe G1, and the outlet of the gas-liquid separator 2 is connected to the inlet of the diaphragm compressor Y; The function of the gas-liquid separator 2 is to separate the liquid hydrogen fluoride carried by the pipeline G1 during the operation of the compressor. A nitrogen valve F3 is installed on the gas-liquid separator 2. After unloading, the liquid hydrogen fluoride in the gas-liquid separator 2 is pressurized to the hydrogen fluoride storage tank 1.

[0029] (b) The outlet of the diaphragm compressor Y is connected to the tank truck 3 through the pipeline G2. A valve F5 is installed in sequence on the pipeline G2. A tee is installed at the rear end of the valve F5 to connect the pipeline to the compressor inlet pipeline. A regulating valve F1 is installed on the pipeline to control the compressor backflow and facilitate the adjustment of the compressor outlet pressure. A pressure transmitter P is installed on the pipeline to facilitate the monitoring of the unloading pressure. A valve F6 is installed after the pressure transmitter P and connected to the tank truck 3 through a flange.

[0030] (c) Install a nitrogen pipeline N on the pipeline before the pressure transmitter P of pipeline G2, and install a valve F8 on pipeline N for control, so as to facilitate purging after unloading.

[0031] (d) A gas phase pipeline G4 is installed at the top of the hydrogen fluoride storage tank 1. A valve F7 is installed on the pipeline G4 for control. The other end of the pipeline G4 is connected to the water absorption tower 4. The water absorption tower 4 is made of steel lined with PTFE material and filled with PP Pall rings. A water absorption pump 6 is installed at the bottom. A primary water replenishment pipeline W and a valve F9 are installed at the bottom of the water absorption tower 4. Primary water is added to the water absorption tower to the specified level. The water absorption pump 6 is turned on and the gas phase entering from the bottom of the tower is circulated and absorbed through the acid pipeline G8 spray. When the concentration of hydrofluoric acid in the water absorption tower is high, it is transported to the tank area for storage through the pipeline G9. A gas phase pipe G5 is installed at the top of the water absorption tower 4. A temperature sensor T is installed on the pipe G5 to facilitate monitoring of the absorption temperature. The pipe is then connected to the alkali absorption tower 5 for absorption.

[0032] (e) The alkali absorption tower 5 is made of steel lined with PTFE and filled with PP Pall rings. An alkali absorption pump 7 is installed at the bottom. A caustic soda pipeline B and valve F10 are installed in the bottom of the alkali absorption tower 5. Caustic soda is added to the alkali absorption tower to the specified liquid level. The alkali absorption pump 7 is turned on and the gas phase entering from the bottom of the tower is circulated and absorbed through the alkali pipeline G10. When the concentration of alkali solution in the alkali absorption tower is high, it is transported to the tank area for storage through the pipeline G11. The outlet of the alkali absorption tower 5 is connected to the tail gas fan 9 via pipe G6, and the outlet of the tail gas fan 9 is connected to the exhaust pipe G7 for nitrogen discharge.

[0033] (f) Set the PLC controller 8 to be interlocked with the hydrogen fluoride storage tank level gauge L, regulating valve F1, regulating valve F2, pressure transmitter P, and compressor Y. The interlocking logic is as follows: 1. When the hydrogen fluoride storage tank level gauge L reaches 80%, the regulating valve F2 is closed and the compressor Y stops running. 2. When the pressure transmitter P exceeds the set value, the regulating valve F1 is opened to adjust the compressor discharge pressure to stabilize.

[0034] The operation method is also as follows: 1) Connect the diaphragm compressor Y exhaust pipe G2 to the tank truck 3 through valve F6, and connect the tank truck outlet pipe G3 to the hydrogen fluoride storage tank 1 through regulating valve F2; 2) Close valve F7 and turn on water absorption pump 6, alkali absorption pump 7, and exhaust gas fan 9 to ensure operation under slight negative pressure; 3) Open the valves on the compressor inlet and outlet pipes, start the diaphragm compressor Y to begin unloading, and put the interlock into operation; 4) After unloading, close valves F4 and F5, and open nitrogen valve F8 to purge the hydrogen fluoride in tank truck 3 and pipeline G2 into hydrogen fluoride storage tank 1. Open nitrogen valve F13 to purge the liquid phase hydrogen fluoride in gas-liquid separator 2 into hydrogen fluoride storage tank 1; 5) During the purging process, open valve F7, and after purging for a period of time, close the purging nitrogen N. When the temperature sensor T shows a significant upward trend, it indicates that the nitrogen in the hydrogen fluoride storage tank 1 has been completely discharged, and the vaporized hydrogen fluoride enters the water absorption tower 4, causing the temperature to rise.

[0035] like Figure 1 As shown, an industrial anhydrous hydrogen fluoride storage and closed-loop unloading system aims to solve the safety hazards and environmental pollution problems existing in traditional unloading processes. By introducing key equipment such as diaphragm compressors, gas-liquid separators, water absorption towers, and alkali absorption towers, and combining them with an automated control system and interlocking protection mechanisms, the system effectively achieves safe and efficient unloading and storage of anhydrous hydrogen fluoride. In particular, the system also features a complete exhaust gas treatment process to ensure that exhaust gas meets emission standards and reduces environmental impact. Furthermore, the use of nitrogen purging procedures and cold insulation measures further enhances the system's safety and reliability. This invention not only significantly reduces the risks for chemical enterprises in the operation of anhydrous hydrogen fluoride but also provides effective technical support for environmental protection, possessing significant economic and social value.

[0036] The detailed structure of this system is as follows: Connect the diaphragm compressor Y exhaust pipe G2 to the tank truck 3 via valve F6, and connect the tank truck outlet pipe G3 to the hydrogen fluoride storage tank 1 via regulating valve F2.

[0037] Close valve F7 and turn on water absorption pump 6, alkali absorption pump 7, and exhaust gas fan 9 to ensure operation under slight negative pressure.

[0038] Open the valves on the compressor's inlet and outlet pipes, start the diaphragm compressor Y to begin unloading, and put it into operation.

[0039] After unloading, close valves F4 and F5, and open nitrogen valve F8 to purge the hydrogen fluoride in tank truck 3 and pipeline G2 into hydrogen fluoride storage tank 1. Open nitrogen valve F13 to purge the liquid phase hydrogen fluoride in gas-liquid separator 2 into hydrogen fluoride storage tank 1.

[0040] During the above purging process, valve F7 is opened, and after purging for a period of time, the purging nitrogen N is closed. When the temperature sensor T shows a significant upward trend, it indicates that the nitrogen in the hydrogen fluoride storage tank 1 has been completely discharged, and the vaporized hydrogen fluoride enters the water absorption tower 4, causing the temperature to rise.

[0041] The hydrogen fluoride storage tank 1 is equipped with cold insulation measures. When the pressure in the hydrogen fluoride storage tank 1 is too high during the summer high temperature, the absorption system is also activated to reduce the pressure and ensure storage safety.

[0042] The entire process strictly follows a chain logic, avoiding problems such as overpressure and overloading. Furthermore, the effective treatment by water absorption tower 4 and alkali absorption tower 5 ensures that the exhaust gas meets emission standards, reducing environmental impact. Meanwhile, the issue of excessive pressure inside the storage tank during hot summer weather is addressed by promptly activating the absorption system to reduce pressure, ensuring the safe operation of the storage tank.

Claims

1. An industrial anhydrous hydrogen fluoride storage and closed-loop unloading system, characterized in that, The unloading system includes the following structure: The top of the hydrogen fluoride storage tank (1) is connected to the gas-liquid separator (2) via pipe G1, and the outlet of the gas-liquid separator (2) is connected to the inlet of the diaphragm compressor Y. The outlet of the diaphragm compressor Y is connected to the tank truck (3) through the pipeline G2. A valve F5 is installed on the pipeline G2 in sequence. A tee is installed at the rear end of the valve F5 to connect the pipeline to the compressor inlet pipeline. A regulating valve F1 is installed on the pipeline to control the compressor backflow and facilitate the adjustment of the compressor outlet pressure. A pressure transmitter P is installed on the pipeline to facilitate the monitoring of the unloading pressure. A valve F6 is installed after the pressure transmitter P and connected to the tank truck (3) through a flange. A nitrogen pipeline N is installed on the pipeline before the pressure transmitter P in pipeline G2, and a valve F8 is installed on the nitrogen pipeline N to facilitate purging after unloading. A gas phase pipe G4 is installed at the top of the hydrogen fluoride storage tank (1), and a valve F7 is installed on the gas phase pipe G4. The other end of the gas phase pipe G4 is connected to the water absorption tower (4). A gas phase pipe G5 is installed at the top of the water absorption tower (4), and a temperature sensor T is installed on the gas phase pipe G5 to facilitate monitoring of the absorption temperature. Then, the gas phase pipe G5 is connected to the alkali absorption tower (5) for absorption. The outlet of the alkali absorption tower (5) is connected to the tail gas fan (9) via pipe G6, and the outlet of the tail gas fan (9) is connected to the exhaust pipe G7 for nitrogen discharge. The PLC controller (8) is interlocked with the hydrogen fluoride storage tank level gauge L, regulating valve F1, regulating valve F2, pressure transmitter P, and diaphragm compressor Y.

2. The industrial anhydrous hydrogen fluoride storage and closed-loop unloading system according to claim 1, characterized in that, The water absorption tower (4) is made of steel lined with PTFE material and filled with PP Pall rings. A water absorption pump (6) is installed at the bottom. A primary water supply pipeline W and valve F9 are installed in the bottom of the water absorption tower (4).

3. The industrial anhydrous hydrogen fluoride storage and closed-loop unloading system according to claim 1, characterized in that, The alkali absorption tower (5) is made of steel lined with PTFE material, filled with PP Pall rings, and equipped with an alkali absorption pump (7) at the bottom. A caustic soda pipeline B and valve F10 are installed in the bottom of the alkali absorption tower (5).

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