Figure 1 shows the main blocks of a coal based IGCC plant similar to the recent demonstrationunits. The coal is supplied to the gasifier where it is partially oxidized under pressure (30-80bar). The plant uses oxygen as oxidant and therefore has an air separation unit (ASU). In thegasifier, which is of the entrained flow slagging type, the temperature may exceed 1500 °C. Thehigh temperature ensures that the ash is converted to a liquid slag with low viscosity, so that itmay easily flow out of the gasifier.
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