Carbon capture is gathering the momentum to achieve the target of carbon neutrality. However, common carbon capture technology e.g. absorption technology has a very high regeneration energy which leads to the loss of thermal efficiency when retrofitting for the plant. This paper initially proposes a general concept of sorption carbon capture technology with heat pump and explore the performance of adsorption carbon capture integrated with compression heat pump as a case study. Activated carbon is selected as the adsorbent for temperature swing adsorption (TSA). Results indicates that theoretical exergy efficiency of 4-step TSA cycle ranges from 0.05 to 0.16 at different adsorption and desorption temperatures. Net efficiencies of coal-fired plant using adsorption capture technologies range from 35.1% to 35.4% when desorption temperature rises from 50oC to 70oC. Also levelized cost of electricity of coal-fired plant using activated carbon ranges from 50.5 USD·MWh-1 to 50.9 USD·MWh-1 which has a marginal increase at different desorption temperatures. The result is about 6% lower than that using Monoethanolamine. It is demonstrated that adsorption capture for coal-fired plant may be a promising solution to reduce the energy consumption in the near future.
Keywords carbon capture, adsorption, regeneration energy, heat pump