Open AccessAdsorption properties of environmentally friendly insulating medium C 4 F 7 N and its common decomposition products in NaA, NaZSM‐5, and NaX molecular sieves
Author(s) -
Tian Shuangshuang,
Yuan Zian,
Zhang Xiaoxing,
Wang Yingxiang,
Luo Weifeng,
Liu Yang
Publication year - 2023
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve2.12265
Subject(s) - molecular sieve , adsorption , decomposition , molecular dynamics , environmentally friendly , chemistry , chemical engineering , materials science , organic chemistry , computational chemistry , ecology , engineering , biology
Selecting suitable materials to adsorb the C 4 F 7 N mixtures decomposition products could not only keep the stable operation of the environmentally friendly insulating gas switch cabinet, but also ensure the safety of operation and maintenance personnel. It is necessary to study the interaction of three types of molecular sieves with the C 4 F 7 N mixture and its decomposition products, which could provide a theoretical basis for the selection of adsorbents in the C 4 F 7 N gas switch cabinet. In this research, the molecular dynamics simulation was used to study the C 4 F 7 N‐CO 2 mixture and its ten kinds of decomposition products CO, CF 4 , C 2 F 6 , C 3 F 6 , C 3 F 8 , CF 3 H, CF 3 CN, C 2 F 5 CN, C 2 N 2 , and COF 2 in three molecular sieves adsorption process (NaA, NaZSM‐5, and NaX). The gas concentration distribution curve and interaction energy parameters were obtained by simulation. The interaction energies of C 3 F 8 in NaA, C 4 F 7 N in NaZSM‐5, and C 3 F 6 in NaX molecular sieve are the largest, which are −368.35 kJ/mol, −174.93 kJ/mol, and −340.09 kJ/mol respectively. Then, the theoretical results were verified by the fluorocarbon gases adsorption experiment. The adsorption performance of three molecular sieves for all gases was obtained by combining the experimental results and dynamics parameters. The adsorption rate of the NaA molecular sieve for fluorocarbon gas is less than 35%, and its adsorption performance for all gases is weak. NaZSM‐5 and NaX molecular sieves show excellent adsorption performance for C 3 F 6 and C 3 F 8 , and the adsorption rates are over 70%. NaZSM‐5 molecular sieve shows good adsorption capacity for CF 3 CN, C 2 F 6 , C 2 N 2 , C 3 F 6 , C 3 F 8 , C 4 F 7 N, and C 2 F 5 CN. NaX molecular sieve shows good adsorption capacity for C 3 F 6 , C 3 F 8 , C 4 F 7 N, and C 2 F 5 CN. Both of them have the potential to be used as adsorbents in environmental protection insulated gas switch cabinet.