Design of an integrated system based on K2CO3-based adsorbents for CO2 capture driven by solar spectral beam splitting in hybrid PV/T
Potassium-based CO2 adsorbents show great potential for CO2 capture from post-combustion flue gas,while integrating power plants with the dry carbonate CO2 capture process imposes significant energy penalties due to the en-ergy consumption required for sorbent regeneration.How to deal with the energy penalty for carbon capture without af-fecting the power generation efficiency of power plants remains a challenge.Besides,due to the mismatch between the spectral energy and the bandgap energy of photovoltaic cells,about 80% of the energy is converted into waste heat dur-ing the photovoltaic conversion process of concentrated photovoltaics,thus affecting the safety and efficient operation of the photovoltaic cells.It remains a challenge to minimize the adverse effect of waste heat on power generation efficiency and to maximize the utilization of the spectral energy for photovoltaic cells.In this work,the concept of integrating the dry regenerable carbonate CO2 capture process with solar spectral beam splitting in hybrid PV/T is proposed.A spec-tral splitter is employed to allocate the energy in the visible light band range for photovoltaics for electricity generation,while the energy in the remaining bands is concentrated for heat production for driving the regeneration of potassium-based adsorbents.A prototype is developed and the experimental results show that the temperature in concentrating col-lector exceeds 170o C with an average photovoltaic power generation of 9.2 W,demonstrating the complete regeneration of potassium-based adsorbents under the radiation of 400～600 W·m-2.A typical 330 MW power station is taken for case study,and the results show that the integrated system surpasses the independent system in CO2 capture efficiency by 13.1% and the comprehensive utilization rate of solar energy is significantly improved.Compared with the simple superposition system of individual power plant and photovoltaic power generation,the total output power of the integrat-ed system increases by 25.1 MW,achieving the synergistic effect of 1+1>2 and demonstrating significant energy-sav-ing and emission-reduction effects.With various benefits considered,the integrated system shows good economic bene-fit,with a short static investment payback period of 4.6 years.The CO2 capture technology using potassium-based ad-sorbents driven by solar spectral beam splitting in hybrid PV/T is appliable to the central and western regions of Chi-na,where solar and fossil energy resources are abundant.This will provide new insights into the parallel utilization of clean energy and fossil fuels,and the technology shows high application value and good prospects.
solar assisted carbon captureregeneration of potassium-based CO2 adsorbentsphotovoltaic power gener-ationphotovoltaic residual heat utilizationCO2 capture in coal-fired power plants
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