Hydrogen cryomagnetics
Hydrogen cryomagnetics is a term used to denote the use of cryogenic liquid hydrogen to cool the windings of an electromagnet. The proposition has particular benefit when low temperature liquid hydrogen is used simultaneously as an energy carrier and as a cryogen to cool electromagnet windings. Powerful synergistic benefits are likely to arise when hydrogen is used as a fuel and as a coolant[1]. The specialist hydrogen-cooled electromagnets might be wound using copper or superconductors. Superconductors have the property that they can operate very efficiently as electrical resistive losses are almost entirely avoided. Most commonly the term hydrogen cryomagnetics is used to denote the use of high temperature superconductivity in the magnet windings. Hydrogen cryomagnetics is especially useful where high magnetic fields are required, such as in high torque electric motors. At atmospheric pressure liquid hydrogen boils at 20.28K.[2]. Liquid hydrogen at approximately 20.3K (-259.3°C) is significantly colder than the temperatures at which superconductivity can first be induced in a range of important high temperature superconductors including yttrium barium copper oxide (YBCO). YBCO has a superconducting transition temperature (Tc) of 93K[3]. The operation of YBCO-based superconducting magnets at a temperature more than 70K below Tc allows for the use of very high current densities and very high magnetic fields without loss of superconductivity. The materials properties of YBCO are such that it cannot be made into ductile wires although much progress has been made towards high field YBCO electromagnets based on the use of tapes rather than wires[4]. Another superconductor suitable for hydrogen cryomagnetic use is magnesium diboride[5][6]. Magnesium diboride is a conventional superconductor and it can be prepared in flexible wires with potential application in tokamak fusion reactors[7]. Magnesium diboride has a transition temperature of 39K[8]. While at atmospheric pressure liquid hydrogen is cold enough to cool magnesium diboride into the superconducting state, there are advantages to pumping on the hydrogen so as to lower its temperature still further when in use such a magnet winding. Generally the greater the margin between conductor temperature and superconducting transition temperature the better. Concerning the use of normal conductors, low temperature copper windings can be used highly effectively in pulsed field magnets. Liquid hydrogen is not the only way cryogenically to cool a magnet. For superconductors the usual coolant is liquid helium at 4.2K and for conventional conductors (including copper) most attention has been given to liquid nitrogen at 77K[9]. Liquid hydrogen can be expected to drive better performance than liquid nitrogen and, as discussed below, liquid hydrogen avoids several concerns around helium availability. Any use of hydrogen cryomagnetics requires careful consideration of hydrogen safety. Hydrogen cryomagnetics is concept distinct from the use of higher temperature gaseous hydrogen as a coolant in power plant turbines.
Origins
The term hydrogen cryomagnetics was first used publicly at an Institute of Physics conference held in Manchester England in April 2010[10]. The presentation was delivered by Professor WJ Nuttall and co-authored by Professor BA Glowacki and Dr L Bromberg. The journey to the term had involved thinking around Hydrogen as a Fuel and as a Coolant – from the superconductivity perspective[1]. Earlier related consideration of liquid hydrogen as a cryogenic coolant includes work by Glowacki and co-authors from 2005[11]. The concept of hydrogen cryomagnetics has been further elaborated and discussed in 2012[12], 2015[13] and 2019[14].
Attributes of Hydrogen Cryomagnetics
The emergence of hydrogen cryomagnetics is likely to benefit from the development of strong industrial interest in liquid hydrogen occurring for other reasons. Global interest is growing in hydrogen as a low-carbon energy carrier sourced from renewables (green hydrogen) or alternatively from natural gas with carbon capture and storage (blue hydrogen). In future hydrogen could be distributed regionally and globally as a high pressure pipeline gas or as a condensed fluid in maritime shipping. Candidate fluids include ammonia and methylcyclohexane. One liquid option, however, for maritime shipping and road/rail tanker shipping is cryogenic liquid hydrogen.
The production of liquid hydrogen is energy intensive and particular care needs to be taken on cooling with regard to minimising inefficiencies associated with a nuclear magnetic ortho-para transition[15]. As a consequence, and in the continued absence of a radical innovation, the production of liquid hydrogen is best performed at a large scale. Similarly the transport and distribution of liquid hydrogen has been found to be the most efficient option when moving the largest quantities over the largest distances[16]. As such it is likely that liquid hydrogen will be favoured in the scenario of a large-scale hydrogen economy as might be expected in a strong push to a Net Zero future going beyond what can be delivered quickly and affordably by electrification alone. Any such large-scale expansion of liquid hydrogen production and distribution can be expected to greatly favour the subsequent use of hydrogen in cryomagnetic applications.
Avoiding the problems of helium
The conventional way to cool superconducting magnets is to use liquid helium (atmospheric pressure boiling point 4.2K). Helium is a by product of the current natural gas industry[17] and its fluctuating price and availability have been a cause of much concern in recent years[18]. Improved efficiency of use, and the avoidance of waste, can be expected to stretch helium supplies. Further natural gas sourced helium cannot necessarily be expected to continue if natural gas is to be phased out on a journey to Net-Zero. There is a need for those helium using sectors that can substitute away from helium to do so[19]. Those users that could safely switch to hydrogen cryomagnetics could see a significant reduction in operating costs and avoid risks associated with helium supply scarcity.
Better Electric Motors
In the twentieth century the dominant type of electric motor was an induction motor using tightly wound copper wire coils to generate the necessary internal magnetic fields. More recently, and in part spurred on by the growth in battery electric vehicles, there has been much innovation in permanent magnet motors. These rely on high field permanent magnets relying on rare earth minerals. Hydrogen cryomagnetics provides for the possibility of superconducting induction motors cooled by liquid hydrogen at approximately 20K. Such cryogenic liquid might be available on a vehicle (such as an airplane, train, truck, bus or even car) if high purity hydrogen is used for on-board fuel cell electricity generation.
Liquid Hydrogen - a source of high purity hydrogen
The boil off gas from a tank of liquid hydrogen can be expected to be extremely pure and clean. In a sense the liquid hydrogen has been distilled. Extended operation of Fuel Cell Electric Vehicles, for example, relies on the need to protect fuel cell membranes and catalysts from contamination. Fuel cell degradation in use can have many causes[20], but nevertheless fuel purity (in normal conditions and in the case of refuelling equipment failure) can be expected to be a major concern for any system relying on high pressure hydrogen gas handling. While the presence of cryogenic liquid hydrogen can be expected to prompt special safety scrutiny from regulators the presence of high quality fuel should provide a compensatory source of comfort.
Potential applications of Hydrogen Cryomagnetics
- Fusion Energy
The concept of applied hydrogen cryomagnetics first emerged in connection with magnetically confined nuclear fusion. WJ Nuttall had proposed in 2004 that the commercialisation of fusion energy might be via the international oil companies rather than via electricity[21]. For technical and economic reasons fusion energy might be a viable means to produce liquid hydrogen for the hydrogen economy in ways reminiscent of today's liquefied natural gas economy. Conventional tokamak fusion is likely to require very large amounts of expensive and scarce liquid helium to cool superconducting magnets. Liquid helium is a key consumable in the conventional paradigm. Noting the potential abundance of liquid hydrogen at a future fusion facility owned by one of today's international oil companies it would seem natural to use the cryogenic hydrogen to help break the dependence on helium. Hydrogen cryomagnetics has the potential to facilitate tokamak fusion energy. These ideas came together as a concept known as 'Fusion Island' developed by WJ Nuttall, BA Glowacki and RH Clarke[22]. The Fusion Island concept was outlined further in 2008[23] and 2021[24]. Commonwealth Fusion Systems in Massachusetts is actively exploring superconducting magnet technologies cooled to liquid hydrogen temperatures[25]
- Aviation
Another significant opportunity for hydrogen cryomagnetics lies in low CO2 emissions aviation. Airbus, Rolls-Royce and collaborators have been pioneering the use of liquid hydrogen in aircraft propulsion. Writing in Aviation Week in April 2021, Thierry Dubois observed[26]: “Airbus has launched an ambitious demonstration program for the use of superconducting technology. It is aiming at a major efficiency improvement. The idea stems from both the difficulty of designing an electric-propulsion architecture with conventional wiring and the opportunity to use liquid hydrogen as a cold source. Superconducting materials require cryogenic temperatures.” Hydrogen cryomagnetics permits the on aircraft use of hydrogen fuel cell technology to generate electricity to drive high torque HTS based electric motors capable of driving propellers or ducted fans at high efficiency. The Advanced Superconducting Motor Experimental Demonstrator (ASuMED) programme funded by the European Union, is working on a 99% efficient superconducting aircraft engine with a power-to-weight ratio of 20kW/kg[27]. Even before the benefits to be obtained from the use hydrogen cryomagnetic superconducting induction motors hydrogen is attracting much interest as a low emission aviation fuel of the future. Airbus has an active hydrogen program as do other major industrial concerns in global aviation.
- Metals Processing Industry
Hydrogen Cryomagnetics has potentially beneficial synergistic links with the emerging low emission steel industry as being pioneered by SSAB in Sweden. Hydrogen is being developed as an alternative to coking coal for the reduction of iron ores to produce pig iron (‘smelting’). The use of hydrogen for such purposes would greatly strengthen links between hydrogen and steel making. With that in mind, if a forge were to have access to cryogenic liquid hydrogen then large scale magnetic induction forging based upon hydrogen cryomagnetic technology could be extremely economically attractive, especially for billet heating.
References
- ↑ 1.0 1.1 BA Glowacki and WJ Nuttall, Hydrogen as a Fuel and as a Coolant – from the superconductivity perspective, Journal of Energy Science, 1 (1) pp. 15-28, published by Wroclaw University of technology, Poland, available at:https://www.dbc.wroc.pl/dlibra/publication/5150/edition/4928/content accessed 11 February 2022.
- ↑ "Hydrogen | H (Element) - PubChem". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-02-11.
- ↑ Wu, M. K.; Ashburn, J. R.; Torng, C. J.; Hor, P. H.; Meng, R. L.; Gao, L.; Huang, Z. J.; Wang, Y. Q.; Chu, C. W. (1987-03-02). "Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure". Physical Review Letters. 58 (9): 908–910. doi:10.1103/PhysRevLett.58.908. ISSN 0031-9007.
- ↑ "High-temperature superconducting tape suitable for magnets at 50 teslas and beyond - MagLab". nationalmaglab.org. Retrieved 2022-02-11.
- ↑ Glowacki, B A; Nuttall, W J (2008-02-01). "Assessment of liquid hydrogen cooled MgB2conductors for magnetically confined fusion". Journal of Physics: Conference Series. 97: 012333. doi:10.1088/1742-6596/97/1/012333. ISSN 1742-6596.
- ↑ Stautner, W.; Xu, M.; Mine, S.; Amm, K. (2014). "Hydrogen cooling options for MgB2-based superconducting systems". Anchorage, Alaska, USA: 82–90. doi:10.1063/1.4860686.
- ↑ Glowacki, B A; Nuttall, W J (2008-02-01). "Assessment of liquid hydrogen cooled MgB2conductors for magnetically confined fusion". Journal of Physics: Conference Series. 97: 012333. doi:10.1088/1742-6596/97/1/012333. ISSN 1742-6596.
- ↑ Nagamatsu, Jun; Nakagawa, Norimasa; Muranaka, Takahiro; Zenitani, Yuji; Akimitsu, Jun (March 2001). "Superconductivity at 39 K in magnesium diboride". Nature. 410 (6824): 63–64. doi:10.1038/35065039. ISSN 0028-0836.
- ↑ Fritz Herlach 1999 Rep. Prog. Phys. 62 859
- ↑ W.J Nuttall, B.A. Glowacki and L. Bromberg, Fusion Island – Latest Considerations Concerning Magnetic Fusion, Hydrogen Cryomagnetics and Thermochemical Hydrogen Production, presented at conference Novel Aspects of Surfaces and Materials (NASM 3), 11-15 April 2010, Manchester, United Kingdom
- ↑ B. A. Głowacki, A. P. Finlayson, W. J. Nuttall, T. Janowski, Hydrogen as a fuel and as a coolant - from the superconductivity perspective, presented at: Electromagnetic devices and processes in environmental protection ELMECO-5 : 5th International Conference, Nałęczów, Poland, September 2005. Proceedings: Lublin : Wydawnictwo Drukarnia Liber Duo, 2005.- s. pp.173-185.
- ↑ Bartek A. Glowacki , Chapter 16. Substituting hydrogen for helium in cryogenic applications, in WJ Nuttall, RH Clarke and BA Glowacki (editors), Future of Helium as a Natural Resource, Routledge (2012)
- ↑ Glowacki, B. A.; Nuttall, W. J.; Hanley, E.; Kennedy, L.; O’Flynn, D. (2015-02-01). "Hydrogen Cryomagnetics for Decentralised Energy Management and Superconductivity". Journal of Superconductivity and Novel Magnetism. 28 (2): 561–571. doi:10.1007/s10948-014-2660-7. ISSN 1557-1947.
- ↑ Nuttall, William J.; Bakenne, Adetokunboh T. (2020), Nuttall, William J.; Bakenne, Adetokunboh T., eds., "Hydrogen Cryomagnetics—A Physics-Based Innovation", Fossil Fuel Hydrogen: Technical, Economic and Environmental Potential, Cham: Springer International Publishing, pp. 101–108, doi:10.1007/978-3-030-30908-4_9, ISBN 978-3-030-30908-4, retrieved 2022-02-11
- ↑ "Next Steps for Hydrogen: Physics, technology and the future". Next Steps for Hydrogen: Physics, technology and the future | Institute of Physics. Retrieved 2022-02-11.
- ↑ Nuttall, William J.; Bakenne, Adetokunboh T. (2020), Nuttall, William J.; Bakenne, Adetokunboh T., eds., "Hydrogen Infrastructures", Fossil Fuel Hydrogen: Technical, Economic and Environmental Potential, Cham: Springer International Publishing, pp. 69–77, doi:10.1007/978-3-030-30908-4_6, ISBN 978-3-030-30908-4, retrieved 2022-02-11
- ↑ Nuttall, William; Clarke, Richard; Glowacki, Bartek, eds. (2012-06-25). The Future of Helium as a Natural Resource. Routledge. ISBN 978-1-136-32273-0. Search this book on
- ↑ SelectScience. "Helium shortage 2.0 and the alternatives for gas chromatography | SelectScience". www.selectscience.net. Retrieved 2022-02-11.
- ↑ Nuttall, William J.; Clarke, Richard H.; Glowacki, Bartek A. (2012). "Stop squandering helium". Nature. 485 (7400): 573–575. doi:10.1038/485573a. ISSN 1476-4687.
- ↑ Ren, Peng; Pei, Pucheng; Li, Yuehua; Wu, Ziyao; Chen, Dongfang; Huang, Shangwei (2020-09-01). "Degradation mechanisms of proton exchange membrane fuel cell under typical automotive operating conditions". Progress in Energy and Combustion Science. 80: 100859. doi:10.1016/j.pecs.2020.100859. ISSN 0360-1285.
- ↑ Nuttall, William (2004-05-28). "Fusion should put its energy into oil". The Engineer. Archived from the original on 2021-11-28. Retrieved 2022-02-11.
- ↑ Nuttall, William; Glowacki, Bartek; Clarke, Richard (2005-10-31). "A trip to 'Fusion Island'". The Engineer. Retrieved 2022-02-11.
- ↑ WJ Nuttall and BA Glowacki, Viewpoint: Fusion Island, Nuclear Engineering International, 53, (648), July 2008, pp. 38-41
- ↑ William J Nuttall, Chapter 11: Commercial opportunities for nuclear fusion in William J. Nuttall, David Webbe-Wood, Satoshi Konishi, Shutaro Takeda (Editors) Commercialising Fusion Energy - how small businesses are transforming big science, IOPP Publishing, Bristol (2020).
- ↑ "Mind-boggling magnets could unlock plentiful power". BBC News. 2021-05-10. Retrieved 2022-02-15.
- ↑ "Airbus' Hydrogen Drive Will Materialize In Demonstrators | Aviation Week Network". aviationweek.com. Retrieved 2022-02-11.
- ↑ "Fully Superconducting Motor Prepares for Testing by Jody_Muelaner". Engineering.com. Retrieved 2022-02-11.
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