SBIR/STTR Phase II: Development of Stable Membrane-Based Gas-Liquid Contactors for SO2 Removal from Flue Gas

SBIR/STTR 第二阶段：开发用于去除烟气中 SO2 的稳定膜基气液接触器

• 批准号: 0078527
• 负责人: Sudipto Majumdar
• 金额: $ 40万
• 依托单位: COMPACT MEMBRANE SYSTEMS, INC
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-01-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0078527&HistoricalAwards=false
• 关键词: SBIR; STTR; Phase; II; Development

This Small Business Innovation Research Phase II project will demonstrate theenhanced performance of membrane-based gas-liquid contactors to abate SO2emissions from flue gas. SO2 present in flue gas streams leads to deforestation anddamage to crops and property as a result of its participation in the formation of acidrain. In Phase I, Compact Membrane Systems, Inc. (CMS) developed a nonporousperfluorocopolymer composite membrane designed for use in membrane-based gasliquid contactors to scrub flue gas of SO2 using an aqueous absorbent solution. Thismembrane is designed to overcome the major drawbacks of conventionalmicroporous supports, i.e. progressive wetting out of the microporous substrate bythe (typically) aqueous absorbent and in some instances salt precipitation at theliquid-gas interface. In addition to all the operational advantages of membranecontactors, CMS membranes result in sustained improved SO2 removal efficiencies.During Phase I it was demonstrated that this membrane permeated SO2, scrubbed aflue gas simulant gas stream of SO2 as well as if not better than a conventionalmicroporous membrane contactor under identical conditions, and showed no loss inperformance despite exposure to an acidified silica suspension. Phase II will scale-upthe process to employ large pilot-scale contactors, study absorbent regenerationtechnologies, demonstrate the whole process on a pilot-scale combustor, anddemonstrate that the CMS system offers better efficiencies and economics of flue gasremoval compared to existing systems.The enhanced performance of membrane-based gas-liquid contactors to abate SO2emissions from flue gas is of considerable interest to ore processors, pulp and paperindustries, many oil and natural gas processors (particularly those which have totreat tail gases from gas sweetening processes), power plants employing coal as afossil fuel, etc.

这个小型企业创新研究第二阶段项目将展示膜式气液接触器的增强性能，以减少烟气中的二氧化硫排放。烟气流中存在的SO2由于参与酸雨的形成而导致森林砍伐和对作物和财产的损害。在第一阶段，Compact Membrane Systems，Inc. (CMS)开发了一种无孔全氟共聚物复合膜，设计用于膜基气液接触器，以使用吸收剂水溶液洗涤烟道气中的SO2。这种膜被设计成克服常规微孔支撑物的主要缺点，即通过（通常）含水吸收剂逐渐润湿微孔基底，并且在某些情况下在液-气界面处盐沉淀。除了膜接触器的所有操作优点之外，CMS膜还导致持续改进的SO2去除效率。在第一阶段期间，证明了这种膜渗透SO2，洗涤SO2的烟道气模拟气流，以及如果在相同条件下不优于常规微孔膜接触器，并且尽管暴露于酸化二氧化硅悬浮液中，也没有表现出性能损失。第二阶段将扩大该工艺的规模，采用大型中试规模的接触器，研究吸收剂再生技术，在中试规模的燃烧器上演示整个工艺，并证明CMS系统与现有系统相比，具有更高的效率和更好的烟气去除经济性。基于膜的气液接触器在减少烟气中SO2排放方面的增强性能对矿石加工商、纸浆和造纸工业具有相当大的兴趣，许多石油和天然气加工厂（特别是那些必须处理来自气体脱硫过程的尾气的加工厂）、使用煤作为化石燃料的发电厂等。