Niannian Dai , Peng Jia , Qianxi Qu , Huan Chen , Liguo Wang , Yaran Shi , Rendong Guo , Dong Xu , Laifeng Li
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引用次数: 0
摘要
要研究低温吸附分离氦同位素，就必须弄清氦同位素在低温下的吸附特性。本文建立了一个低温吸附测量装置。它由一个以 GM Cryocooler 为冷源的低温恒温器、一个 Setaram 气体吸附仪和一个温度控制器组成。在不同温度和压力（15-300 K，0-1.5 MPa）下，采用体积法研究了氦-4 吸附等温线。结果表明，在 300 K 和 77 K 条件下，活性炭能吸附少量氦气；随着温度从 20 K 降至 15 K，氦气的吸附量增加。此外，还得到了等效吸附热，吸附热约为 515 J/mol，且变化不大。此外，还利用 Langmuir 模型和 Toth 模型对低温吸附结果进行了分析。
The adsorption characteristics of helium under low temperature
To study the separation of helium isotopes by cryogenic adsorption, figuring out the adsorption characteristics of helium isotopes at low temperature is necessary. In this paper, a cryogenic adsorption measurement device has been established. It consists of a cryostat with a GM Cryocooler as cold source, a Setaram gas sorption instrument and a temperature controller. The helium-4 adsorption isotherms were studied under different temperatures and pressures (15–300 K, 0–1.5 MPa) by volumetric method. The results showed that a little helium was adsorbed by activated carbon at 300 K and 77 K. The amount of adsorbed helium increased with the temperature decreased from 20 K to 15 K. At pressures lower than 0.2 bar, the adsorption capacity increased rapidly as the pressure increased. Besides, the isosteric heats of adsorption were obtained, which was around 515 J/mol and changed little. Moreover, the cryogenic adsorption results were analyzed by Langmuir model and Toth model.
期刊介绍：
Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are:
- Applications of superconductivity: magnets, electronics, devices
- Superconductors and their properties
- Properties of materials: metals, alloys, composites, polymers, insulations
- New applications of cryogenic technology to processes, devices, machinery
- Refrigeration and liquefaction technology
- Thermodynamics
- Fluid properties and fluid mechanics
- Heat transfer
- Thermometry and measurement science
- Cryogenics in medicine
- Cryoelectronics
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