Abstract
The present article discusses the potential for hydrogen separation using a metal hydride separator, which facilitates the generation of hydrogen contained in syngas following the thermal recovery of wastes. The article provides a detailed description of the separator heat balance using analytical calculations and optimised calculations, and by applying numerical methods. The proposed concept of a separator intended for hydrogen separation from syngas offers a solution to a problem associated with the use of metal hydride alloy powders; in particular, their low thermal conductivity. In order to eliminate big temperature differences in the alloy, a heat transfer intensifier was implemented in the metal hydride alloy volume; the intensifier was made of metal and exhibited high thermal conductivity. For the purpose of comparing the thermal fields, the first stage comprised the creation of a numerical simulation of hydrogen absorption without the use of an intensifier. Subsequently, three different geometries were created for an intensifier intended to remove heat from the metal hydride alloy powder towards the separator cover, and the effects of these three geometries were analysed. The implementation of heat transfer intensifiers into the metal hydride alloy powder improved the heat removal by as much as 43.9% and increased the thermal field homogeneity by 77%. A result of the heat removal optimisation was an increase in the hydrogen absorption kinetics and the efficiency of the separator operation.
Highlights
IntroductionGlobal warming belongs to the best-known threats to sustainable development [1]
Global warming belongs to the best-known threats to sustainable development [1].A reduction of greenhouse gas emissions is the way to slow it down, and this was the target to which 194 countries committed by signing the Paris Convention, with the aim to maintain global warming below the limit of an increase in the average global temperature of a maximum of two degrees Celsius
The hydrogen separation from a mixture of syngas generated during the plasma gasification of non-recyclable or hazardous wastes facilitates an energy carrier to be obtained in form of hydrogen, which is CO2 neutral when further processed
Summary
Global warming belongs to the best-known threats to sustainable development [1]. A reduction of greenhouse gas emissions is the way to slow it down, and this was the target to which 194 countries committed by signing the Paris Convention, with the aim to maintain global warming below the limit of an increase in the average global temperature of a maximum of two degrees Celsius. In order to achieve the objective outlined in the. Paris Convention, all the countries must regularly determine their own climate objectives for 5-year periods and gradually increase them [2,3]. The European Union, including Slovakia, is committed to achieving carbon neutrality by 2050, consisting in emitting only an amount of carbon dioxide into the atmosphere that nature can accumulate in real time or a short term. One of the alternatives to an energy carrier is hydrogen [4,5]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
