An oxygen rich gas stream, containing 90-92% oxygen by weight, is
needed to combust biomass in the gasifier. Oxygen rich gas from the
oxygen receiver at the air separation plant is pressurized by the
oxygen booster compressor to about 180 PSIG and is stored in a
vendor-supplied surge tank. Oxygen from the surge tank is routed
through a vendor-supplied heat exchanger, where medium pressure
steam is used to indirectly pre-heat the oxygen gas stream to
approximately 390 °F for introduction to the gasifier.