Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Innovational Fund for Scientific and Technological Personnel of Hainan Province[KJRC2023C15]
No full textImproved permeability in ceramsite@powdered activated carbon (PAC)-MnOx coupled gravity-driven ceramic membrane (GDCM) for manganese and ammonia nitrogen removal with intermittent short-term vertical aeration
No full textIn our work, a gravity -driven ceramic membrane bioreactor (GDCMBR) was developed to remove Mn2+ and NH3- N simultaneously through the birnessite water purification layer in -situ construction on the ceramic membrane due to chemical pre -oxidation (powdered activated carbon (PAC)-MnOx). Considering the trade-off of biofouling and water production, the daily intermittent short-term vertical aeration mode was involving to balance this contradiction with the excellent water purification and improved membrane permeability. And the GDCMBR permeability of operation flux was improved for 5-7 LHM with intermittent short-term vertical aeration. Furthermore, only -7 % irreversible membrane resistance (Rir) also confirmed the improved membrane permeability with intermittent short-term vertical aeration. And some manganese oxidizing bacteria (MnOB) and ammonia oxidizing bacteria (AOB) species at genus level were identified during long-term operation with the contact circulating flowing raw water, resulting in the better Mn2+ and NH3-N removal efficiency. Additionally, the nano -flower-like birnessite water purification layer was verified in ceramsite@PAC-MnOx coupled GDCMBR, which evolute into a porous flake -like structure with the increasing intermittent short-term aeration duration. Therefore, the sustainable and effective intermittent short-term aeration mode in ceramsite@PAC-MnOx coupled GDCMBR could improve the membrane permeability with the satisfactory groundwater purification efficiency, as well as providing an energy -efficient strategy for membrane technologies applications in water supply safety
A new state-dependent constitutive model for cyclic thermo-mechanical behaviour of unsaturated vegetated soil
No full textClimate change has resulted in increasing attention being paid to the effects of temperature and humidity on vegetated soil. However, existing constitutive models rarely investigate the thermo-mechanical behaviour, such as the accumulation of plastic strain under non -isothermal conditions, of unsaturated vegetated soil. To address this issue, this study developed a comprehensive constitutive model by adopting state -dependent dilatancy in conjugation with loading, memory, and bounding surfaces. Moreover, root -induced hardening due to pore occupancy and internal bonding is modelled with dependence on the root volume ratio. The performance of this newly developed constitutive model is then evaluated using previous laboratory element tests. Comparisons between the computed and measured results reveal that the model is capable of capturing variations in soil state at a range of temperatures, suctions, and root volume ratios. The shearing behaviour of vegetated soil, especially its volumetric response, is well predicted by the model, as confirmed by comparing it with triaxial compression test results. Moreover, the model predicts that the accumulated volumetric strain of unsaturated vegetated soil (0.2%) is significantly less than saturated bare soil (1.1%) after four thermal cycles. These computed results imply that vegetation can mitigate the effects of climate change on soil through both transpiration -induced suction and mechanical reinforcement
Assessing Energy Consumption, Carbon Emissions, and Costs in Biomass-to-Gas Processes: A Life-Cycle Assessment Approach
No full textChina has a huge potential for biomass utilization. Converting low-grade biomass into high-quality hydrogen and natural gas is of great significance in promoting the utilization of biomass resources and the achievement of carbon reduction goals. Based on the data of biomass collection, transportation, power generation, hydrogen production and gas production stages in China, this paper constructs a multi-chain hybrid whole-life process evaluation model for "electricity to gas" and comprehensively compares the energy consumption, carbon emission and cost of the two chains of "hydrogen production from biomass power generation" and "methane production from biomass power generation". We comprehensively compare the energy consumption, carbon emissions and costs of biomass-to-hydrogen and biomass-to-methane technologies. Biomass natural gas is found to have significant advantages in terms of energy consumption, carbon emissions and economics compared to biomass hydrogen production. In order to promote the development of the biomass "electricity to gas" industry in China, this paper proposes that PEM electrolysis tanks can be used for hydrogen production, and the distance from the biomass feedstock collection to the hydrogen production chemical park should be optimized to reduce the whole-life-cycle cost. Biomass natural gas can buy time for the development of China's hydrogen industry and infrastructure construction
Assessing Energy Consumption, Carbon Emissions, and Costs in Biomass-to-Gas Processes: A Life-Cycle Assessment Approach
No full textChina has a huge potential for biomass utilization. Converting low-grade biomass into high-quality hydrogen and natural gas is of great significance in promoting the utilization of biomass resources and the achievement of carbon reduction goals. Based on the data of biomass collection, transportation, power generation, hydrogen production and gas production stages in China, this paper constructs a multi-chain hybrid whole-life process evaluation model for "electricity to gas" and comprehensively compares the energy consumption, carbon emission and cost of the two chains of "hydrogen production from biomass power generation" and "methane production from biomass power generation". We comprehensively compare the energy consumption, carbon emissions and costs of biomass-to-hydrogen and biomass-to-methane technologies. Biomass natural gas is found to have significant advantages in terms of energy consumption, carbon emissions and economics compared to biomass hydrogen production. In order to promote the development of the biomass "electricity to gas" industry in China, this paper proposes that PEM electrolysis tanks can be used for hydrogen production, and the distance from the biomass feedstock collection to the hydrogen production chemical park should be optimized to reduce the whole-life-cycle cost. Biomass natural gas can buy time for the development of China's hydrogen industry and infrastructure construction
Performance analysis of zeotropic organic Rankine cycle with a vapor-liquid injector
No full textTo improve the performance of small-scale organic Rankine cycle (ORC), an ORC with a vaporliquid injector (IORC) using zeotropic mixture R601a/R245fa as working fluid is proposed. Parametrical investigations of the injector and system are carried out. The research results of injector show pure R601a has the highest injector pressure lift and exergy efficiency. The working fluids with higher temperature glide tend to have lower exergy efficiency. The increase of injector entrainment ratio and injector area ratio decreases pressure lift and exergy efficiency. The research results of system shows that the introduction of the zeotropic working fluid and injector can complement advantages and disadvantages of each other. Taking R601a/R245fa (60 %:40 %) as working fluid, IORC has higher net power than basic ORC (BORC) when pump efficiency is lower than 88 % and hot water temperature drop is less than 51 degrees C. There exists an injector entrainment ratio which makes net power maximum. Increasing injector area ratio decreases net power. Increasing injector entrainment ratio and decreasing injector area ratio reduce cooling water. Increasing injector entrainment ratio and injector area ratio makes heat exchanger economy worse
Performance enhancement of form stable phase change materials: a review of carbon nanomaterial-based strategies
No full textCarbon nanomaterial-based form stable phase change materials (FSPCM) offer significant potential as energy storage materials. However, the timely review respectively summarizing the evolution of each carbon nanomaterial and their differences is still lacking. Herein, a comprehensive and systematic approach to gathering, analyzing, and synthesizing relevant literature is employed to conduct this review paper. Specifically, this review provides an extensive examination of PCM encapsulation techniques employing carbon nanomaterial-based materials, discussing their underlying mechanisms and strategies for improving thermal performance. Additionally, it explores the practical applications of carbon nanomaterial-based FSPCMs and discusses future avenues for research and development in this field. By focusing on advancing encapsulation techniques, improving performance, and expanding application possibities, this review aims to contribute to the ongoing progress in the field of carbon nanomaterial-based FSPCMs
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