化工进展2023，Vol.42Issue(12)：6649-6657,9.DOI:10.16085/j.issn.1000-6613.2023-0164
基于多孔陶瓷膜的脱硫废水负压式膜蒸馏实验
Experimental study on membrane distillation of desulfurization wastewater with negative pressure using porous ceramic membrane
摘要
Abstract
At present,many researches on membrane distillation with porous ceramic membranes have been conducted.However,due to the hydrophilic characteristic of the ceramic membrane,hydrophobic modification is required before use.It results in the increase of process and cost,and the hydrophobicity of the membrane gradually weakens with time.Therefore,the membrane distillation of desulfurization wastewater with negative pressure using porous ceramic membrane was proposed.The hydrophilic porous ceramic membrane was directly adopted.The negative pressure of the solution stream was formed by the suction effect of pump,thus the solution was prevented from permeating through the membrane.To explore the heat and mass transfer mechanism of membrane distillation with negative pressure,the performance of hydrophilic and hydrophobic porous ceramic membranes under different operating conditions were experimentally compared.The results showed that when the negative pressure in the membrane tube was lower than the capillary pressure in the membrane pores,the solution transport and water vapor transport occurred respectively in the pores of the hydrophilic and hydrophobic porous ceramic membranes.For air flow rate of 22L/min,wastewater temperature of 50℃and flow rate of 11L/h,the permeation flux of the hydrophilic membrane was in the range of 1.9-3.9kg/(m·h),while that of hydrophobic membrane was only 0.13-0.25kg/(m·h).The thermal efficiencies of hydrophilic and hydrophobic porous ceramic membranes were about 92%and 55%,respectively.This indicated that thermal efficiency of the hydrophilic membranes was larger,and the high thermal conductivity of ceramic membrane favored the enhancement of the membrane distillation performance.The flow rate of desulfurization wastewater had little effect on the heat mass transfer performance,and the membrane permeation flux increased with the increasing of air flow rate or wastewater temperature.关键词
多孔陶瓷膜/负压式/膜蒸馏/渗透通量/热效率Key words
porous ceramic membrane/negative pressure/membrane distillation/permeation flux/thermal efficiency分类
通用工业技术引用本文复制引用
陈君丹,杨敏林,黄斯珉,肖烈晖..基于多孔陶瓷膜的脱硫废水负压式膜蒸馏实验[J].化工进展,2023,42(12):6649-6657,9.基金项目
国家自然科学基金(52006038,52090061) （52006038,52090061）
广东省基础与应用基础研究基金(2019A1515110806) （2019A1515110806）
广东省分布式能源系统重点实验室项目(2020B1212060075). （2020B1212060075）
