Evaluation of the effects of heat conducting enhancement measures on MOFs hydrogen storage system for ship's propulsion plant. (20th May 2021)

• Record Type: Journal Article
• Authors: Qingrong, Zheng; Weidong, Zhang; Xuan, Zhang; Mengbo, Wu; Shengping, Liao
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 35(2021)
• Page Start: 18412
• Page End: 18422
• Publication Date: 2021-05-20
• Subjects: MIL-101 -- Composite adsorbent -- Adsorption equilibrium -- Charge and discharge -- Hydrogen; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.02.210
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Experiments were conducted for developing an on board MOFs hydrogen storage system by cryo-adsorption in terms of adsorption equilibrium and charge/discharge characteristic of the adsorbent bed. MIL-101 was synthesized by hydrothermal method, the expanded natural graphite (ENG) and a honeycomb heat exchanging device were then introduced for monolith and heat conducting enhancement. Structural characterization and measurement of thermal conductivity were performed on the MIL-101 and its composites synthesized by mixing ENG with different mass ratios. Adsorption equilibrium data of hydrogen on the MIL-101 and MEI-01 (composite formed by adding ENG with a mass ratio 0.1) were measured at a temperature-pressure range from 77.15K to 87.15 K and 0–6 MPa. Accuracies of results predicted by Langmuirian equations were compared, Toth equation and Henry law were then employed to calculate the isosteric heat of hydrogen adsorption. Charge and discharge tests were conducted under the flow rate 20 L · m i n − 1 on a 3.2 L conformable vessel respectively filled MIL-101, MIL-101+honeycomb heat exchanging device and MEI-01. It shows that the isosteric heats on two samples are similar and are about 3.1 kJ · m o l − 1 − 7.4 kJ · m o l − 1 ; the honeycomb heat exchanging device is better on weakening the thermal effect of the adsorbent bed than adding the ENG. It suggests that employing a conformable shape vessel equipped with a honeycomb heat exchanging device is a feasible solution to an on board MOFs hydrogen storage system. Highlights: Addition of ENG has little effect on mean pore widths of MIL-101 composite. Isosteric heats of hydrogen adsorption on MIL-101 and its composite are similar. Equipping heat exchanging device is better on managing thermal effect. Charge/discharge amount is greater by equipping heat exchanging device. Addition of ENG is beneficial to improving UCR of the vessel.