| Concentrated solar power technology uses solar power to generate electricity and is a clean form of renewable energy utilization.Affected by the earth's orbit around the sun and the rotation of the earth,as well as changes in weather,the intensity of sunlight is unstable.So there are cases of excessive supply and insufficient supply.In order to meet the power demand of the energy terminal and ensure the stable operation of the energy supply end,it is necessary to provide a heat storage system for the concentrated solar power station.In this paper,the CaCO3/CaO thermochemical energy storage system was studied in condition of the solar collector temperature being at 800? and above.The impact of temperature on the ratio of CaCO3 decomposition is studied,and the impact of temperature and Characteristic diameter on the rate of decomposition is also discussed.Moreover,the relation between temperature and energy consumption of decomposition is analyzed.The difference of breakthrough curve between zeolite 13X and zeolite 5A used for CO2/N2 adsorption/desorption is studied.Furtherly,the impact of pressure on adsorption capacity is explored.The simulation software is adopted to calculate the thermal efficiency of the heat storage system varying with temperature of CaCO3 decomposition,temperature of adsorption and temperature of desorption separately.Besides,the two ways of CO2 storage:absorbed by MDEA aqueous solution and adsorbed by zeolite is compared.The results show that the time for complete decomposition of CaCO3 particles is mainly controlled by temperature;zeolite 13X has higher adsorption capacity for CO2 and longer mass transfer section than zeolite 5A.The overall thermal efficiency of heat storage using zeolite will increase with the increase of heat source temperature,and will decrease with the increase of adsorption temperature and desorption temperature.Although the overall thermal efficiency of the MDEA system is higher than the zeolite system,the CO2 regeneration energy consumption of the former has exceeded the heat released by CaO carbonation,so it is obviously unreasonable for the heat storage system. |
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