Experimental investigation on sorption performance of new high–efficiency,inexpensive H2 getters in high–vacuum,variable density–multilayer insulated hydrogen storage equipment |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenic Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. China Special Equipment Inspection and Research Institute, Beijing, 100029, China;3. College of Petroleum and Chemical, Lanzhou University of Technology, Lanzhou, 730050, China;1. Indo-Korea Science and Technology Center (IKST), Jakkur, Bengaluru 560065, India;2. Electronic Materials Research Center, KIST, Seoul 136-791, South Korea;3. Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul 02792, Seoul, Republic of Korea;1. FGBOU VO “South Russian State Polytechnic University (NPI) Named After M.I. Platov”, 346428, Rostov Region, Novocherkassk, Str. Enlightenment, 132, Russia;2. Don Technologies LLC, 164A, St. Mikhailovskaya, Novocherkassk, 346400, Russia;3. DonEnergoMash Innovation and Technology Center LLC, 344000, Rostov-on-Don, Suvorov St., 38a, Office 13, Russia;4. FGBUN “Federal Research Center Southern Scientific Center of the Russian Academy of Sciences” (UNC RAS), 344006, Rostov-on-Don, Pr. Chekhova, 41, Russia;1. Guangdong Energy Group Science and Technology Research Institute Co. Ltd., Guangzhou 510000, China;2. Guangdong Huizhou Lng Power Co. Ltd., Huizhou 516000, China;3. Guangdong Energy Group Co., Ltd., Guangzhou 510000, China;4. School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, China |
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| Abstract: | Hydrogen (H2) is released by the manufactured materials, which results in the deterioration of the insulation performance of liquid hydrogen (LH2) storage tanks. The getter is found in the vacuum annular space of equipment and helps maintain the high vacuum of LH2 tanks. Palladium oxide (PdO), an effective H2 getter, is expensive, resource–constrained and unsuitable for the LH2 equipment. Therefore, suitable and inexpensive alternatives were examined using LH2 storage tanks, to maintain the insulation property of the high–vacuum variable–density multilayer insulation (VDMLI) equipment better. Eight types of H2 getters were designed using in the LH2 tanks, and classified into three categories, namely, chemical, physical and physico–chemical getters (PCNHG). The sorption performance of new H2 getters was compared with that of PdO. PdO could be replaced by in the 7:1, 5:1 and 4:1 ratio by PCNHG1, PCNHG2 and CNHG in the LH2 tanks, respectively. The results demonstrated that the sorption capacity of PCNHG1 and PCNHG2 were 1.70 and 2.14 times that of the same type of getters in the market (16.35% and 20.62% higher than that of PdO, respectively). Their average H2 sorption efficiency was 1.17 times and 1.05 times of that of PdO, respectively. The minimum thermal conductivity exhibited by CNHG was only 6.34% of that of PdO, and the sorption capacity of CNHG was 1.82 and 1.44 times that of PCNHG1 and PCNHG2, respectively. However, the sorption capacities of PCNHG1, PCNHG2 and CNHG were belows that of PdO. These results help facilitate reduction in the expense of H2 getters and provide an important reference to enhance the sorption performance of getters. |
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| Keywords: | High–vacuum variable–density multilayer insulation Getters Sorption efficiency Sorption capacity Minimum thermal conductivity |
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