Proposed Process and Design Considerations for Air Separation and CO sub(2) Purification in a 100MWe Oxy-Coal Power-Generation System

Oxy-coal combustion is one of the most promising approaches for carbon capture and storage associated with large-scale coal-fired power stations. This paper presents the results of a study on air-separation and CO sub(2)-purification processes in terms of a conceptual design for an oxy-coal combustion system for 100MWe (electrical) power generation. Feasible processes and design considerations for air separation and CO sub(2) purification are proposed that take into account the operational stability of the overall plant before its demonstration. Air separation by using a double column, which has two main air compressors, to produce 95% purity gaseous O sub(2) is proposed. Two possible cases for cryogenic separation according to the phase of the captured CO sub(2) are considered. In addition, we consider the installation and management of the air-separation and CO sub(2)-purification units to demonstrate the 100MWe oxy-coal power plant and methods to reduce power consumption in the processes. Airing it out: Air-separation and CO sub(2)-purification conditions differ in the general application of oxy-coal combustion-based power generation. Feasible processes and design considerations are proposed to take into account the operational stability of the overall plant. The installation and management of the system and methods to reduce power consumption in the processes are discussed.