Investigation of the Concepts to Increase the Dew Point Temperature for Thermal Energy Recovery from Flue Gas, Using Aspen®

Abstract

Thermal energy of flue gases (FG) dissipating from industrial facilities into the environment, constitute around 20% of the total dissipated thermal energy. Being part of the FG, water vapour carries thermal energy out of the system in the form of the latent heat, which can be recovered by condensation, thus increasing the overall efficiency of an industrial process. The limiting factor in this case is the low dew point temperature (usually 40-60 • C) of the water vapour in the FG. The increase of the dew point temperature can be achieved by increasing the water content or pressure. Taking these measures as a basis, the presented work investigated the following concepts for increasing the dew point temperature: humidification of the flue gas using water, humidification using steam, compression of the FG and usage of the steam ejector. Modelling of these concepts was performed using the commercial software Aspen ® . The humidification of the FG using water resulted in the negligible increase in the dew point (3 • C). Using steam humidification the temperatures of up to 92 • C were reached, while the use of steam ejector led to few degrees higher dew point temperatures. However, both concepts proved to be energy demanding, due to the energy requirements for the steam generation. The FG compression enabled the achievement of a 97 • C dew point temperature, being both energy-efficient and exhibiting the lowest energy cost. Energies 2019, 12, 1585 2 of 17 Energies 2019, 12, 1585 13 of 17repair costs of the compressor are normally higher than the equipment used in the other proposed concepts and should be taken into account in the future work.

Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces

“…Motivation behind this study is related to the recent reports on superhydrophobic surfaces promoting the jumping-droplet condensation process which exhibits high heat transfer coefficients [5,6]. This behaviour could extend the possibilities of different condensation systems for the recovery of the latent heat of the water vapour in the flue gas [7]. Apart from that, further applications and processes dependent on the wettability phenomenon include printing, adhesion, coating, lubrication, air conditioning, desalination, corrosion prevention, oil-water separation, anti-icing, food packaging, etc.…”

Special Issue “Fluid Flow and Heat Transfer”

“…• "Investigation of the Concepts to Increase the Dew Point Temperature for Thermal Energy Recovery from Flue Gas, Using Aspen®" by Fedorova et al [20].…”