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CO 2 capture and storage (CCS) is an effective method for achieving CO 2 mitigation while simultaneously keeping energy supplies secure. To put CCS into practice, it is important to develop energy-efficient industrial technologies for CO 2 capture. In this work, a pilot-scale demonstration of carbon capture from flue gas by adsorption technology was performed in an existing coal-fired power plant in China, and the power energy consumption to capture 1 kg of CO 2 was measured onsite; furthermore, the feasibility and efficiency of adsorption technology for postcombustion CO 2 capture were investigated. The pilot-scale carbon capture plant consisted of two successive VPSA units coupled with a dehumidifying unit. In the dehumidifying unit, water vapor in the desulfurized flue gas was removed by alumina adsorption. Then, CO 2 in the dehumidified flue gas was captured by two successive VPSA units, where the three-bed eight-step VPSA process was employed in the first unit packed with zeolite 13X APG, and the second two-bed six-step VPSA unit was packed with pitched activated carbon beads. A roots blower was used to supply the desulfurized flue gas to the pilot-scale carbon capture plant at a controlled flow rate, and both a reciprocating pump and a diaphragm pump were employed to desorb adsorbents under vacuum pressure in the two-stage units and recover high-purity CO 2 for subsequent storage or utilization. Some key assessment parameters were measured onsite, including the flow rate of flue gas, CO 2 recovery from flue gas, CO 2 purity in the product gas, and power energy consumption to capture 1 kg of CO 2, and the experimental results were verified by numerical simulations using a multibed VPSA modeling framework. Based on the experimental and simulated results, CO 2 capture from flue gas in an existing coal-fired power plant by two successive VPSA units was evaluated.
Wang et al. (Tue,) studied this question.