Concomitant removal of NOx and SOx from a pressurized oxy-fuel combustion process using a direct contact column
Artikel i vetenskaplig tidskrift, 2018

The simultaneous removal of NO x and SO x using a direct contact column has potential for efficient treatment of the flue gases arising from pressurized oxy-fuel combustion. This study focuses on a parametric analysis of the efficiency of NO x and SO x removal from the flue gas of an oxy-fuel combustion process using an Aspen Plus direct contact column model. The chemistry implemented in this model reflects the state-of-the-art NO x and SO x reaction mechanisms, with particular emphasis on the liquid-phase chemistry, including pH-dependency. The effects of pressure, water flow rate, and recycle ratio on the removal efficiencies of NO x and SO x were evaluated. The evaluation was conducted based on the base case pressurized (15 bar) flue gas with a feed rate of 120 kg/s and inlet temperature of 40 °C before it was supplied to the column. NO x removal efficiency increased from 70% to 97% when the pressure increased from 15 bar to 30 bar, whereas 99.9% of the SO 2 was absorbed from the flue gas at 15 bar. We show that the removal efficiency is pH-sensitive and it is directly influenced by the recycle ratio and liquid-to-gas ratio (L/G). As the L/G ratio was increased, the removal efficiency of SO x and NO x increased. On the other hand, when the recycle ratio of bottom liquid was increased, the removal efficiency of SO x and NO x decreased.

Pressurized combustion

NOx

Emissions

SOx

Oxy-fuel combustion

Författare

Tefera Zelalem Tumsa

Korea Institute of Industrial Technology Evaluation and Planning

University of Science and Technology (UST)

See Hoon Lee

Chonbuk National University

Fredrik Normann

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Klas Andersson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Sima Ajdari

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Won Yang

University of Science and Technology (UST)

Korea Institute of Industrial Technology Evaluation and Planning

Chemical Engineering Research and Design

0263-8762 (ISSN) 1744-3563 (eISSN)

Vol. 131 626-634

Ämneskategorier

Energiteknik

Kemiska processer

Bioenergi

DOI

10.1016/j.cherd.2017.11.035