A novel low-carbon distributed energy system with complementation between natural gas and medium-temperature solar energy
Complementation between natural gas and solar energy based on chemical looping exhibit advantages in low carbon emissions,energy storage,and high energy efficiency.Currently,typical reduction temperature of methane-based chemical looping is 800 ℃.The conversion rate of methane is comparatively low at a medium temperature of 450 ℃,resulting in reduced efficiency in both thermo-chemical energy storage and distributed energy systems.A novel thermochemical energy storage method was proposed to address the low methane conversion rate under medium temperature conditions.The method involves the consumption of hydrogen by an oxygen carri-er,leading to a decrease in hydrogen partial pressure,thereby shifting the reaction of methane reforming forward and subsequently enhan-cing methane conversion rates.Mechanistic experimental results show that the new thermochemical energy storage method of methane refor-ming coupled with chemical looping achieves a higher conversion rate than that of the traditional methane-based chemical looping.Meth-ane is completely converted through multiple cycles at 450 ℃.A multi-energy complementary distributed energy system model was estab-lished based on the new thermochemical energy storage method.Natural gas-solar thermochemical energy storage method elevates low-grade solar energy to high-grade chemical energy while simultaneously achieving low-energy decarbonization.The solid fuel generated from the natural gas-medium-temperature solar energy thermochemical method produces high-temperature thermal energy during the oxi-dation step.The high-temperature thermal energy is harnessed to generate electricity through a turbine,and subsequently,an excess heat recovery system enables absorption refrigeration and heating,thereby achieving efficient complementary utilization of solar energy and fossil fuels.The operational performance of the system under typical conditions was investigated,showing that the distributed energy system based on the new method achieved a net solar electricity generation efficiency of 24.90％and a fuel saving rate of 43.24％,demonstrating significant advantages in energy savings and emission reduction.
solar thermochemistrysteam methane reformingchemical loopingenergy storagedistributed energy system
万方数据
维普
