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International Journal of Energy Policy and Management

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Parametric Cost Analysis and Optimization of a Cryogenic Adsorption System for Helium-Hydrogen Separation

International Journal of Energy Policy and Management
Vol.3 , No. 1, Publication Date: Mar. 14, 2018, Page: 29-40

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Authors

[1]	Dibyendu Bandyopadhyay, Heavy Water Division, Bhabha Atomic Research Centre, Mumbai, India.
[2]	Rupsha Bhattacharyya, Heavy Water Division, Bhabha Atomic Research Centre, Mumbai, India.
[3]	Sandeep Kannuparambil Chandrasejgaran, Heavy Water Division, Bhabha Atomic Research Centre, Mumbai, India.

Abstract

Separation of hydrogen and its isotopes from helium gas is a necessary operation in the context of fusion energy systems. One of the techniques available for this separation is selective cryogenic adsorption of hydrogen on microporous adsorbents like molecular sieves (MS). In this work, adsorption isotherm data at 77 K for hydrogen on four kinds of commercially available molecular sieves have been experimentally obtained and fitted to the Langmuir isotherm. The adsorption isotherms and the constant pattern breakthrough model has been used to determine the breakthrough time and length of the mass transfer zone, and hence the size of an adsorbent bed for a given breakthrough hydrogen concentration. The cost of hydrogen adsorbed has been obtained by considering the cost of adsorbent, adsorption vessel, nitrogen boil-off losses and gas pumping costs. The effect of variation of parameters like adsorbent particle type, size, gas velocity through the bed, feed hydrogen concentration on the normalized cost of the adsorption system per adsorption cycle per mole of hydrogen adsorbed was studied. These parametric studies allowed determination of preliminary design parameters of the most economical adsorption system for hydrogen-helium separation, based on the entire adsorption process and using minimal experimental data.

Keywords

Cryogenic Adsorption, Molecular Sieves, Cost Analysis, Hydrogen Helium Separation, Parametric Optimization

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