Announcements

GSSE Seminar by David Shan Hill Wong - Thursday, 23 May 2019, 10:00 Room ENG Z15

Author: Graduate School of Sciences and Engineering
Time: 10:00
Location: ENG Z15

******************************

KOÇ UNIVERSITY

GRADUATE SCHOOL OF SCIENCES AND ENGINEERING

SEMINAR SERIES

******************************

Speaker: David Shan Hill Wong - Department of Chemical Engineering National Tsing Hua University 

 

Title: Thermodynamics and Process System Engineering in Carbon Dioxide Capture

 

Date: 23 May 2019

 

Time: 10:00-11:00

 

Cookie & Tea: 10:00

 

Place: ENG Z15

 

Host: Prof. Yaman Arkun

 

Abstract:

One of major challenges of the coming future is how to limit or reduce global warming.  Post combustion carbon dioxide capture, storage and utilization has been identified as one of the means that can account a significant portion of carbon reduction required.  Chemical absorption is a current technology that is available for post-combustion capture.  Large scale demonstration projects are already in place. 

A national program of science and technology on energy has been set up to accumulate scientific knowledge and engineering know-how on this technology.   In this presentation, we shall report the lesions learned through this project on the design, operation and control of such processes from both the thermodynamic and process system point of view. 

There two major challenges to improve the existing post-combustion capture process by chemical solvents.  One is reducing the capital expenditure (CAPEX) of the plant due to the large amount of flue gas that has to be processed.  The other is reducing the operational expenditure (OPEX) of the plant which is mainly contributed by heat consumed by the reboiler of the stripper. 

One alternative to reduce the size of the absorber is to reduce mass transfer limitations by incorporating rotating packed bed (RPB) technology into the capture process.  We shall walked through a series of laboratory work, modelling and design, and pilot tests results in this area. 

The most commonly deployed solvents in post-combustion CO2 capture is alkanol-amines.  However, there is always the concern of carcinogenic effects of degradation products of such amines.  Ammonia is another alternative with well-known toxicology.  However, slip control of the more volatile ammonia and reducing its energy consumption are the keys to further advances.   For this process, we shall report how proper accounting for mass transfer in model simulation could affect prediction of energy expenditure and various heat integration technologies can be used to reduce energy consumption.

In addition, other issues of plant-wide control and flexible operation, techno-economic analysis of leveraging SOx and CO2 co-capture will also be discussed. 

 

Biography: Please see attached.