Warm-Gas Cleanup Train
The bench-scale warm-gas cleanup train is portable and can be placed at the back end of any gasification system. It is
used for ash/particulates, S (H
2S, COS), mercury, trace metals, chlorine, and tar removal, with an adjacent shift reactor to adjust the H
2/CO ratio as
needed (depending on catalyst type). Ceramic/metal candle filters remove particulate to <0.1 ppmw, and fixed-bed reactors reduce mercury or other contaminants.
Operating Conditions
- Nominal feed rate: 1000 scfh
- System pressure: 1000 psi
- System nominal temperature: >600°F (315°C)
- Sulfur reduced to as low as 0.010 ppm
Process
Water–gas shift reactors including sour shift or high-temperature and low-temperature shift can be inserted at any
location in the cleanup train to adjust the H
2/CO ratio of the syngas. The steam or slipstream flow rates
can be modified to control the conversion of CO to CO
2 and H
2 to achieve desired ratios for
further processing. For example, H
2 production can be maximized for H
2 as a product, for additional
thermochemical conversion, or H
2/CO ratios of 1:2 or 1:1 for Fischer–Tropsch processing, depending on catalyst requirements.
