Bench-Scale Development and Testing of Rapid PSA for CO2 Capture
Project No.: DE-FE0007639
W. R. Grace is developing a cost-effective rapid pressure swing adsorption (PSA) process for post-combustion carbon dioxide (CO2) capture from coal-fired power plants. PSA requires only electricity and does not require any of the power plant’s steam. The rapid PSA cycle configuration offers the potential for a separation energy reduction of 36 percent compared to the conventional monoethanolamine (MEA) system. The separation energy savings improves overall plant efficiency.
W. R. Grace’s conventional PSA cycle can achieve more than 90 percent CO2 recovery and more than 95 percent (by volume) CO2 purity using a commercial sorbent (13X zeolite pellets). Although it could be retrofitted to a coal-fired power plant today, the columns would be exceedingly large in diameter, and thus capital intensive. A rapid PSA process, taking advantage of a much shorter cycle time, could potentially solve this problem by reducing the cycle time from 300 seconds (conventional PSA cycle) to 30 seconds or less. This would increase the feed throughput, a measure of the size of the columns, by a factor of 10 or more, while concurrently decreasing the column size by an order of magnitude or more. As a result, the capital and operating costs, as well as the plant footprint, would be reduced.
1-Bed PSA Experimental Apparatus