New Amine-Based Membranes for CO2 Capture
讲座名称:
New Amine-Based Membranes for CO2 Capture
讲座时间:
2018-04-21
讲座人:
W.S. Winston Ho
形式:
校区:
兴庆校区
实践学分:
讲座内容:
讲座名称:New Amine-Based Membranes for CO2 Capture
讲座时间:2018-04-21
讲座地点:化工学院办公楼106室
讲座人: W.S. Winston Ho 院士,美国俄亥俄州立大学
讲座内容:
This presentation covers new advances in amine-containing membranes for CO2 capture from flue gas in coal- and/or natural gas-fired power plants and from <1% CO2 concentration sources, e.g., the residual flue gas after the primary CO2 capture system and coal-mine gas streams. The post-combustion carbon capture from flue gas requires a high CO2/N2 selectivity of 140 along with a very high CO2 permeance of about 700 GPU (1 GPU = 10-6 cm3 (STP)/(cm2 • s • cmHg)) or higher in order to use a stand-alone membrane process. We have synthesized new membranes, showing a high CO2/N2 selectivity of >140 and a high CO2 permeance of >1000 GPU. The membrane was scaled up to 14 inches in width using continuous roll-to-roll fabrication. Aided by a material balance equation, three variables, namely the coating-knife gap setting, web speed, and coating solution concentration, were identified as the critical factors to control the membrane selective layer thickness. This resulted in the membrane with a selective layer of <200 nm. The scale-up membrane exhibited similar performance compared to the lab-size membrane. The scale-up membrane was fabricated into spiral-wound membrane modules for testing with simulated flue gas containing about 20% CO2, 77% N2, 3% O2 and 1 – 3 ppm, showing similar results as the flat-sheet membrane tested in the lab. Techno-economic analysis has shown that the post-combustion capture process using the membrane is promising for meeting DOE’s capture cost target set for 2025. For carbon capture from <1% CO2 concentration sources, we have elucidated the carrier saturation phenomenon. With reducing the CO2 concentration in the feed gas, both CO2 permeance and CO2/N2 selectivity increased. These were mainly due to more available amine carriers for CO2 molecular transport at lower CO2 concentration conditions. In addition, the stability and scale-up of membrane modules will be discussed.
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