Methods for feedstock pretreatment and transport to gasification

摘要

Methods for pretreating feedstock for gasification are provided. At least a portion of a coal based feedstock stream can be combined with at least a portion of a supercritical carbon dioxide stream within a pretreatment system to provide a treated feedstock stream. At least a portion of the treated feedstock stream can be passed to a gasifier to produce a synthesis gas stream of less than 50% by volume carbon dioxide, at least 5% by volume carbon monoxide and at least 1% by volume hydrogen. At least a portion of the synthesis gas stream can be combusted to form an exhaust stream comprising carbon dioxide. At least a portion of the gasification byproduct stream can be purified and compressed to produce supercritical carbon dioxide. At least a portion of the supercritical carbon dioxide can be recycled to the pretreatment system via a supercritical carbon dioxide stream.

主权项

1. A method for pretreating feedstock for gasification comprising:
combining a coal based feedstock and supercritical carbon dioxide within a pretreatment system to provide a treated feedstock; passing at least a portion of the treated feedstock to a gasifier to produce a synthesis gas comprising less than 50% by volume carbon dioxide, at least 5% by volume carbon monoxide and at least 1% by volume hydrogen; combusting at least a portion of the synthesis gas comprising less than 50% by volume carbon dioxide to form an exhaust gas comprising carbon dioxide; compressing at least a portion of the exhaust gas to produce compressed carbon dioxide; and recycling at least a portion of the compressed carbon dioxide at supercritical conditions to the pretreatment system.