Membrane evaporation of amine solution for energy saving in post-combustion carbon capture

Wetting and condensation

Shuaifei Zhao*, Paul H M Feron, Chencheng Cao, Leigh Wardhaugh, Shuiping Yan, Stephen Gray

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A membrane evaporation system for energy penalty reduction in liquid absorbent based carbon capture and the effects of operating parameters (i.e. evaporation temperature, and gas/liquid flow rates) on mass and heat transfer are systematically investigated. It is found that monoethanolamine (MEA) vapor flux is approximately one order of magnitude lower than water vapor flux for membrane evaporation of 30 wt% MEA solution. Heat flux across the membrane is closely associated with mass transfer and is also influenced by the evaporation efficiency. Experimental results show that membrane wetting and vapor condensation occurs during the evaporation of MEA solution. Both evaporation temperatures and liquid flow rates play important roles in membrane wetting via changing the pressure on the liquid side. Slight wetting may decrease both mass transfer and the associated convective heat transfer across the membrane, but it can also provide benefit by preventing CO2 absorption into the lean solvent. The occurrence of vapor condensation on the gas side is determined by the gas flow rate. Vapor condensation occurs at low gas flow rates but it will not be a significant operational issue in the membrane evaporator application as long as condensation occurs within the desorber where the latent heat is released and recovered.

Original languageEnglish
Pages (from-to)60-67
Number of pages8
JournalSeparation and Purification Technology
Volume146
DOIs
Publication statusPublished - 26 May 2015
Externally publishedYes

Keywords

  • Mass and heat transfer
  • Membrane contactor
  • Membrane evaporation
  • Post-combustion carbon capture
  • Sweeping gas membrane distillation

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