Experimental study on water recovery and SO ₂ permeability of ceramic membranes with different pore sizes

Abstract

Summary In this study, the water recovery performance from flue gas with ceramic membrane tubes of different pore sizes 30, 50, and 200 nm was experimentally studied. The effects of flue gas temperature, flue gas flow rate, water coolant temperature, and water coolant flow rate on the water recovery performance were analyzed. In addition, in the experimental study of SO2 permeability, the pH of the water coolant inlet and outlet was measured using a pH meter to analyze the SO2 permeability of ceramic membranes during the water recovery process. The results show that the water recovery performance of the 50 nm pore size ceramic membrane is better than that of the other two types of ceramic membrane in most cases. The maximum amount of reclaimed water and the highest water recovery rate are 4.82 kg/(m2·h) and 80.3%, respectively. Under the same SO2 concentration condition, the SO2 permeation flux of the 30 nm pore size ceramic membrane is smallest, and that of the 200 nm membrane is the largest. When the SO2/N2 mixed gas flow rate is 6 L/min, the SO2 permeation flux of the 30 and 200 nm membranes is 0.407 and 0.635 mmol/(m2·h), respectively. The ceramic membrane with smaller pore size can block more SO2 permeation, while the ceramic membrane with larger pore size can remove SO2 better.

Transport Membrane Condenser Heat Exchangers to Break the Water-Energy Nexus—A Critical Review

“…The exact mechanism of this selectivity is unknown, but it could be attributed to higher preferential condensation of water vapor within the membrane pores. The work by Cheng et al [ 48 ] reported similar trends.…”

“…The quality of recovered water depends on its ability to reject NO X and SO X contaminants. Several works investigated SO x flux in the TMC process [ 6 , 48 , 56 ]. Although flue gas passes through an FGD unit, it still contains ppm-level NO x and SO x contaminants.…”

Improving heat transfer and water recovery performance in high‐moisture flue gas condensation using silicon carbide membranes

“…In addition, compared with the mesoporous ceramic membranes used in some studies, 27,30,53 the macroporous ceramic membranes used in this experiment can eliminate a condensate film at a lower transmembrane pressure difference (below 20 kPa) because of the higher water permeability produced by large pores. The result indicates that ceramic membranes with superior permeability should be developed for moisture recovery to reduce energy consumption.…”

Study on the Preparation and Properties of Talcum-Fly Ash Based Ceramic Membrane Supports

“…As shown in Figure 13 , with flue gas temperature increases, the recovered water flux increases in an approximate parabolic form. That is, the higher the flue gas temperature is, the faster the growth rate of recovered water flux is due to the water vapor content increasing exponentially with an increasing flue gas temperature at a certain flow rate [ 47 ]. However, the flue gas enthalpy value increases with the increase of flue gas temperature.…”