Warm Gas Cleanup for Sulfur Removal and CO2 Capture from Wood-Fired Syngas

摘要

The acid gas removal (AGR) process to capture sulfur and CO2 plays a vital role in advancing syngas toward clean energy applications. The bio-syngas source was obtained from plasma-assisted gasification of wood type feedstock with a gas composition of 25.1% CO, 28.4% CO2, 3.8% CH4, 16.4% H2, 25.5% N2, and 0.8% O2. A trace amount of tar was first removed from the bio-syngas mixture in a test rig of washing tower, and then sulfur and CO2 were removed using sorbents at warm temperature conditions. Gas chromatography analysis showed that the concentration of sulfides in the treated gas mixture after the removal process was lower than 1 ppm. Carbon dioxide removal was 90% using CaO/MgO-based sorbents. Improved syngas quality was maintained for almost 100 h and the solid oxide fuel cell showed excellent performance. These findings demonstrate the potential of upgrade syngas as a renewable energy sources in advanced pollutant control and related applications.