The investigation of desulphurization and water recovery from flue gas using ceramic composite membrane

Abstract

Summary Using nanoporous ceramic composite membranes to remove sulphur dioxide and to recover water vapor in flue gas is a new method, and this paper studied the effects of sulphur dioxide on the water recovery process. In this study, the outer‐side coating of hollow nanoporous ceramic composite membrane is selected as the study object. In the membrane module for desulphurization, one end of membrane is closed to create the high‐pressure environment inside membrane to ensure that the cooling water in the membrane penetrates the outer surface of the membrane to form a stable water film which can absorb sulphur dioxide from flue gas. In the membrane module for recovering water, using a vacuum pump to create micro‐negative pressure environment inside membrane, and then water vapor and condensate can penetrate through the membrane under pressure difference. Based on the ceramic composite membrane module, an integrated experimental platform for desulphurization and water recovery is constructed, and the mathematical model for predicting water recovery performance is established. According to the experimental and theoretical results, the mathematical model can predict the water recovery performance of the ceramic composite membrane.

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

“…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.…”

“…On the other hand, Gao et al [ 56 ] investigated the desulfurization efficiency of the TMC using composite ceramic membranes. The objective of this work was to facilitate the permeation of SO x derivative into the cooling waterside.…”

“…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] [6] reported that TMC membranes show unusually high rejection toward SO x derivatives despite their small size (<1 nm) compared to the membrane pore size (20 nm). SO x selectivity over water vapor reached above 100, which is much higher than the simple Knudsen selectivity of 1.8 (square root of molecular weight ratio).…”

Membrane condenser as emerging technology for water recovery and gas pre-treatment: current status and perspectives

“…More recently, transport membrane condenser were introduced [29][30][31][32][33][34][35][36][37][38]. Both hydrophilic and hydrophobic membranes can be used.…”

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

“…Methods for recycling moisture from high‐humidity flue gas include condensation, absorption, and membrane technology 11 . Condensation technology are widely used for moisture recovery from flue gas 12‐15 .…”