Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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National Natural Science Foundation of China - Guangxi Natural Science Foundation[52006224]
No full textNational Natural Science Foundation of China - Guangxi Natural Science Foundation[52106285]
No full textYoung Talent Support Project of Guangzhou Association for Science and Technology[QT-2023-042]
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Thermal performance and analysis of high-temperature aquifer thermal energy storage based on a practical project
No full textGeothermal heating technology based on high-temperature aquifer thermal energy storage (HT-ATES) is one of important development directions of geothermal multi-energy complementary and integrated energy system. In present article, thermal performance of HT-ATES based on a practical project is first proposed, and a long-term cycle of HT-ATES is constructed and verified. The heating up storage and isothermal heat storage of HT-ATES are experimentally conducted. The different standing time schemes causing mutation of the heat storage mechanism have been implemented to identify the optimal scheme. And then the outlet water temperature, heat storage efficiency is further calculated and analyzed under the same and different conditions of heat storage capacity. Compared with original heat production, the outlet water temperature is promoted and the single well heat storage efficiency can reach >80 % after 9 years of heat storage. The heat storage flow rate decreases or the heat storage temperature increases can prevent heat dissipation to the surroundings, so that obtaining high outlet water temperature and heat storage efficiency under the persistent annual heat storage capacity. Results also show that the outlet water temperature and heat storage efficiency are promoted when the heat storage temperature increases and heat storage flow rate decreases
Carbonized loofah sponge fragments enhanced phase change thermal energy storage: Preparation and thermophysical property analysis
No full textA mixture of polyethylene glycol and stearic acid is developed to extend the working temperature range and improve the heat utilization efficiency, and composited with carbonized loofah sponge fragments using melt impregnation method to improve the thermal conductivity of solid-liquid phase change material and find a solution for its leakage issue. The combination of different components, thermal stability, phase change behavior, thermal conductivity, shape stability, temperature response time and application cost are investigated. The results reveal that the mixture has two phase change temperature peaks including 59.81 degrees C and 68.01 degrees C, latent heat of melting is 215.20 J & sdot;g 1 and latent heat of crystallization is 193.40 J & sdot;g 1. The composites of polyethylene glycol, stearic acid and carbonized loofah sponge fragments is in a physical. Compared to the mixture, the latent heat of the composites gradually decreases, with a maximum decrease of latent heat of melting approximately 12.69 %, a maximum decrease of latent heat of crystallization approximately 10.24 %. For the same content of additives, the latent heat of the proposed composites in this work is greater than that of polyethylene glycolbased and stearic acid -based composites. The thermal conductivity of the composites gradually increases, in a range from 4.47 % to 10.91 %. The thermal conductivity of polyethylene glycol -based and stearic acid -based composites is lower than that of the proposed composites in this work in the case of the same content of additives. The cost of the composites with 2.5 wt% carbonized loofah sponge fragments is with a maximum 33.59 times cheaper than that of the composites with graphene nanoplatelets. Thus, from the perspective of cost, the combination of mixture and carbonized loofah sponge fragments has good economic benefit for thermal energy storage. The proposed composites demonstrate good shape stability, temperature response behavior and good economic benefit, indicating their good application prospects for thermal energy storage
Numerical Simulation of Partitioning and Storage of Impure CO<sub>2</sub> in a Saline Aquifer at the Shenhua CCS Site, China
No full textCarbon capture and storage (CCS) is a key technology to control emissions of CO2 and mitigate climate change. Coinjection of CO2 with major impurity (i.e., N-2 or O-2) into saline aquifers would be an economical strategy. To assess the feasibility of coinjection, the partitioning and storage efficiency of impure CO2 in a deep saline aquifer were numerically investigated using a two-dimensional (2-D) radial anisotropic model, the aquifer condition referred to that of the Shenhua CCS site in the Ordos Basin. The results indicated that a high concentration of impurity moderately accelerated CO2 migration, and the formation dip angle dramatically promoted the migration as well as high temperature. Meanwhile, the partitioning of CO2 with impurities became intensive with the increase of impurity concentration. N-2 could be a suitable tracer to monitor leakage in saline aquifers, since the hysteresis of the breakthrough time between CO2 and N-2 was more evident. Moreover, N-2 lowered the storage efficiency of gaseous CO2, and the lowering was more obvious with the rising formation dip angle and temperature. The impact of N-2 on the storage efficiency of gaseous CO2 was obvious compared to O-2 under the same concentration. The investigation could be crucial for assessing the feasibility of coinjection and the long-term performance of the saline aquifer storage system
Study of Hydrate Particle Morphology and Cohesive Force in the Presence of Wax and Glycine
No full textDuring the operation of deep-sea pipelines, the accumulation and deposition of hydrates are important reasons for pipeline blockage. The current main measure to solve the hydrate plugging problem is the addition of low-dose inhibitors (LDHIs), but it is not yet known whether the precipitation of wax crystals will affect their effectiveness. Therefore, in this study, the hydrate cohesive force within the wax-free/wax-containing system was directly measured by using a micromechanical force device (MMF) and the reasons for the change in cohesive force were analyzed from a morphological point of view. The results showed that glycine was effective in reducing the cohesion between hydrate particles in both wax-free/wax-containing systems and still exerted the effect of antiagglomeration agent (AA) at very low concentrations (as low as 0.10 wt %). Moreover, the optimum concentration of glycine was 0.50 wt %. At this concentration, the cohesive force decreased from 8.54 to 7.07 mN/m in the wax-free system, a decrease of about 17.2%, while the cohesive force decreased from 5.94 to 2.15 mN/m in the wax-containing system, a decrease of about 63.8%. By observation of the morphology of the hydrate particles, the presence of glycine was found to reduce the volume of the liquid bridge by changing the surface roughness and wettability of the particles, thereby reducing the cohesive force. And when wax was contained in the system, the wax further reduced the wettability by adsorbing on the surface of the hydrate particles. However, under certain AA conditions, the increase in wax concentration (from 0.1 to 0.3 wt %) resulted in the free water inside the hydrate being more likely to form liquid bridges with the surrounding particles, thus weakening the effect of AA. This work analyzes the effect on cohesive force in the simultaneous presence of LDHIs and wax from a morphological point of view, which is beneficial in providing more insights into securing safe hydrate flow management
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