Heat Recovery With Low Temperature
Spray Drying For Thermochemical
Hydrogen Production
Author(s)
V. N. Daggupati, G. F. Naterer & K. S. Gabriel
Abstract
This paper examines the heat transfer and evaporative drying of molten salt
droplets in a thermochemical copper-chlorine (Cu-Cl) cycle of hydrogen
production. An aqueous CuCl2 stream exiting from an electrochemical cell is
preheated to 150°C, before entering the flash dryer to produce solid CuCl2(s).
The device must add sufficient heat to remove water and recover solid CuCl2.
New innovations of heat recovery aim to develop alternatives to reduce costs and
improve efficiency of the evaporation process for CuCl2 particle production. This
includes a new method to pressurize the liquid stream sufficiently to atomize
droplets through a pressure-reducing nozzle in the spray system, thereby
enhancing the device’s performance. The liquid phase flashes due to a sudden
pressure drop. Unlike other thermochemical cycles, the Cu-Cl cycle can take
unique advantage of low-grade waste heat for spray drying and vaporizing
processes at low temperatures. The powder produced by spray drying is then
injected in a fluidized reactor to eventually produce hydrogen. A common
byproduct of manufacturing processes, incinerators, industrial furnaces, etc. –
heat – can become a valuable resource through its utility for hydrogen
production with the Cu-Cl cycle.
Keywords: heat recovery, hydrogen production, thermochemical Cu-Cl cycle.
1 Introduction
Hydrogen is a promising clean energy carrier of the future, since its oxidation
does not emit greenhouse gases that contribute to climate change. A UOIT-led
initiative in collaboration with Atomic Energy of Canada Ltd. and other partners
is developing a new route to hydrogen production based on advanced CANDU
Keywords
heat recovery, hydrogen production, thermochemical Cu-Cl cycle.
Related Book
Other papers in this volume
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