Characterization of gas hydrate generation in SDS-R141b compounding static system

ABSTRACT

Coal mine gas control has always been the focus of coal mining enterprises. Curing coal seam gas prevention and control of coal mine gas disaster technology is a new type of local management of mine gas to achieve rapid excavation. The key lies in changing the generation conditions of gas hydrate so that it can solidify the gas in the coal seam and reduce the gas pressure in the coal seam. This paper measured the contact angle of four kinds of thermodynamic accelerators on the coal body, and HCFC-141b was screened as thermodynamic accelerators by combining their own physical and chemical properties. The SDS-R141b compounding system was used to investigate its effect on the generation of gas hydrate, and the results showed that the compounding accelerator could effectively shorten the induction time of the system to 20 min. The compounding accelerator transformed the conventional type I gas hydrate into type II gas hydrate, significantly reducing the thermodynamic conditions for its generation. By adjusting the compounding ratio of the accelerators, the optimal amount of R141b added was found to be ${\mathrm{m}}_{\mathrm{R}141\mathrm{b}}:{\mathrm{m}}_{{\mathrm{H}}_2\mathrm{O}}=1:3.12$. The four thermodynamic accelerators were compounded by adding SDS to each of them to find their optimal ratios and to make a side-by-side comparison of the hydrate generation of the four systems. The results showed that the comprehensive performance of the SDS-R141b compounded system was excellent. These findings are of great significance for preventing gas disasters in mines.

KEYWORDS:

• Gas control
• hydrate
• Gas cure, HCFC-141b
• hydrate accelerator

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

Data will be made available on request.

CRediT authorship contribution statement

Jun Xie: Writing – Review and Editing, Funding acquisition. Qingyao Meng: Conceptualization, Methodology, Operational Experiments, Data Processing and Analysis, Writing – Original draft preparation, Methodology. Anqi Jiang: Methodology, operational experiments. Dawei Chen: Writing – Review and Editing. Yi Wang: Investigation, Resources. Wenlong Jiao: Data Curation. Runhang Liu: Data Curation.

Additional information

Funding

This research is supported by the Shandong Province Natural Science Foundation Project [ZR2023ME052]

Notes on contributors

Jun Xie

Jun Xie, male, professor, senior engineer, registered safety engineer. He received his PhD in Safety Technology and Engineering from Shandong University of Science and Technology in 2008. He is currently working in the School of Safety and Environmental Engineering, Shandong University of Science and Technology. Mainly studying the prediction and control direction of coal and gas outbursts.

Qingyao Meng

Qingyao Meng, male, received the B.S. degree in Safety Engineering, Shenyang Aerospace University, in 2022 and currently studying Safety Science and Engineering at Shandong University of Science and Technology. Mainly studies the prediction and control direction of coal and gas outbursts and gas hydrate technology.

Anqi Jiang

Anqi Jiang, female, received the B.S. degree in safety engineering from Liaocheng University in 2021 and the M.S. degree in safety engineering from Shandong University of Science and Technology in 2024. Mainly studies gas hydrate technology Coal mine gas disaster prevention.

Dawei Chen

Dawei Chen, male. Received the M.S. degree in safety engineering from Shandong University of Science and Technology in 2020 and currently studying safety engineering at the School of Safety and Environmental Engineering, Shandong University of Science and Technology. Mainly studies the prediction and control direction of coal.

Yi Wang

Yi Wang, male. Received the M.S. degree in safety engineering from Shandong University of Science and Technology in 2021 and currently studying safety engineering at the School of Safety and Environmental Engineering, Shandong University of Science and Technology. Mainly studies Mine fire prevention and control.

Wenlong Jiao

Wenlong Jiao, male, received the B.S. degree in Shandong Technology and Business University, in 2022 and currently studying Safety Science and Engineering at Shandong University of Science ad Technology. Mainly studies Mine fire prevention and control.

Runhang Liu

Runhang Liu, male, received the B.S. degree in Harbin University of Science and Technology, in 2022 and currently studying Safety Science and Engineering at Shandong University of Science and Technology. Mainly studies Mine fire prevention and control.