High Purity Helium Liquefier
Our helium liquefaction system utilizes a helium turbo-expander Brayton refrigeration cycle to achieve the desired cooling capacity. Firstly, high-pressure helium gas is obtained through a helium compressor. A portion of the high-pressure helium gas undergoes expansion cooling in the turbo-expander, while the remaining high-pressure helium gas is progressively cooled in multi-stage heat exchangers. Finally, liquid helium is obtained by throttling through a Joule-Thomson valve, and the resulting liquid helium is directly outputted as the product. This type of refrigeration equipment is referred to as a helium liquefier.
The helium liquefaction system utilizes a helium turbo-expander Brayton refrigeration cycle to achieve the process of liquefying helium gas. The system consists of several key components and equipment.
1. Helium Compressor: The helium compressor is responsible for compressing the incoming helium gas to a high pressure. This high-pressure helium gas is the starting point of the liquefaction process.
2. Helium Gas Filter: The helium gas filter is used to remove impurities and contaminants from the helium gas, ensuring the purity and quality of the gas before further processing.
3. 4.5K Cold Box: The 4.5K cold box is a crucial component of the system and serves as a vacuum-insulated container. It maintains extremely low temperatures, around 4.5 Kelvin (approximately -268.65 degrees Celsius or -451.5 degrees Fahrenheit), required for the liquefaction process. The cold box contains various components that play specific roles in the liquefaction process.
a. Multiple-Stage Heat Exchangers: These heat exchangers are responsible for progressively cooling the high-pressure helium gas obtained from the compressor. The heat exchangers facilitate the transfer of heat between the incoming gas and the cooling medium, lowering the gas temperature.
b. Helium Turbo-Expander: The helium turbo-expander is a key component that utilizes the expansion of the high-pressure helium gas to achieve cooling. As the gas expands, its temperature decreases, leading to a cooling effect. This process is known as expansion cooling and plays a crucial role in the liquefaction process.
c. Internal Adsorber Vessel: The internal adsorber vessel helps remove any remaining impurities or contaminants from the helium gas, ensuring the purity of the final liquefied helium product.
d. Low-Temperature Valves: These valves regulate the flow and control the movement of the helium gas at low temperatures within the system.
e. Measurement Components: Various sensors and measurement devices are integrated into the cold box to monitor and measure parameters such as temperature, pressure, and flow rates at different stages of the liquefaction process.
4. Control System: The control system oversees the operation and regulation of the entire helium liquefaction system. It manages the functioning of the compressor, valves, heat exchangers, and other components to maintain optimal process conditions and ensure efficient liquefaction.
5. Liquid Helium Dewar: The liquid helium dewar is the final storage vessel for the liquefied helium. It receives the helium after it passes through the cold box and maintains its low-temperature state.
6. Coaxial Transfer Line: This is a specialized transfer line that connects the cold box to the liquid helium dewar. It allows for the smooth and controlled transfer of the liquefied helium from the cold box to the storage dewar.
7. Helium Gas Buffer Tank: The helium gas buffer tank serves as a reservoir for the helium gas within the system. It helps regulate and stabilize the gas pressure, ensuring a continuous supply of high-pressure helium for the liquefaction process.
| Project |
Performance |
| With LN Pre-Cooling |
40 L/h~50 L/h |
| Without LN Pre-Cooling |
15 L/h |
| Compressor Power |
90 kW |
| COP^-1 |
660 W/W~528 W/W |
| LN Consumption |
25 L/h |
| Continuous Operation |
8000 hours |
| Impure Helium Purity |
90-100% |
High-Stability Gas Thrust Bearing Technology:
* Stable operating speed > 220,000 RPM (revolutions per minute)
* Maximum speed: 270,000 RPM
Ultra-Low Leakage Plate-Fin Heat Exchanger:
* Leakage rate < 10^-9 Pa.m3/s
Optimized Process:
* Bypass valve for the intermediate-pressure heat exchanger: Adaptation to heat exchanger operating conditions, optimization of turbine working conditions, and rapid cooling.
* Improved internal purification process: Adaptation to impure helium purity variations, prevention of ice blockage in the primary heat exchanger.
* Backflow bypass to reduce cooling time.
Intelligent Control Technology:
* User-friendly interface
* Stable control
* Safety interlock measures
| Superconductivity |
Nuclear Fusion |
High Energy Physics |
| Aerospace |
Renewable Energy |
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