636 Oxygen-Enhanced Combustion
and relatively compatible with current power plant
experience. The CPU will have similar issues where
recirculation is required in the main compressor to han-
dle ows lower than 70% and cold box start-up time can
extend plant start-up hours past when the process is in
full oxycombustion mode.
B&W-AL’s CEDF had LOx supply (no ASU), as does
the CIUDEN facility, so turndown and ramping were not
limited by oxidant supply. The Schwarze Pumpe plant
has been designed with a liquid O
2
storage vessel that can
meet the intermittent changes during operation and allow
ramp rates up to 10%/min. The ASU cold box (designed
by Linde) takes 60h to cool down during start-up and can
remain cool for 1–3 days using liquid N
2
prod ...