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| 1 | Entransy dissipation/loss-based optimization of two-stage organic Rankine cycle(TSORC)with R245fa for geothermal power generation显示文摘Based on organic Rankine cycle(ORC), the two-stage evaporation strategy is adopted to replace the single-stage evaporation to improve the system performance. In order to evaluate the temperature matching of the two-stage evaporation, a theoretical optimization model was established to optimize the two stage organic Rankine cycle(TSORC) based on the entransy theory and thermodynamics, with the ratio of the entransy dissipation rate of the TSORC to that of the ORC as the objective function. This paper aims to illuminate the improving degree of the system performance of the TSORC. The results show that the TSORC enhances the average evaporating temperature, thereby reducing the entransy dissipation rate in the evaporator and the total entransy dissipation rate. The maximal net power output is proportional to the entransy loss rate and inversely proportional to the entransy dissipation rate. However, compared with the ORC, the TSORC can output more power but requires a higher total thermal conductance. Moreover, there exists an optimal intermediate geothermal water temperature(IGWT) to maximize the net power output of the TSORC. The TSORC can be considered in engineering applications. | LI TaiLu YUAN ZhenHe XU Peng ZHU JiaLing | 2016 | Science China(Technological Sciences)2016，59，10： | 10 |
| 2 | Cascade utilization of low temperature geothermal water in oilfield combined power generation,gathering heat tracing and oil recovery显示文摘 | LI TAILU | | 0，，07： | 1 |
| 3 | The Coupled Effects of Dryness and Non-condensable Gas Content of Geothermal Fluid on the Power Generation Potential of an Enhanced Geothermal System显示文摘The Enhanced Geothermal System(EGS) is a recognized geothermal exploitation system for hot dry rock(HDR), which is a rich resource in China. In this study, a numerical simulation method is used to study the effects of geothermal fluid dryness and non-condensable gas content on the specific enthalpy of geothermal fluid. Combined with the organic Rankine cycle(ORC), a numerical model is established to ascertain the difference in power generation caused by geothermal fluid dryness and non-condensable gas content. The results show that the specific enthalpy of geothermal fluid increases with the increase of geothermal fluid temperature and geothermal fluid dryness. If the dryness of geothermal fluid is ignored, the estimation error will be large for geothermal fluid enthalpy. Ignoring non condensable gas will increase the estimation of geothermal fluid enthalpy, so the existence of the non-condensable gas tends to reduce the installed capacity of a geothermal power plant. Additionally, both mass flow of the working medium and net power output of the ORC power generation system are increased with increasing dryness of geothermal fluid, however there is some impact of geothermal fluid dryness on thermal efficiency. | LI Tailu LI Xuelong JIA Yanan GAO Xiang | 2021 | Acta Geologica Sinica(English Edition)2021，95，6： | 0 |
| 4 | Assessment and prediction of the effect of ageing on the adsorption of nonylphenol in black carbon-sediment systems显示文摘Black carbon(BC)is a promising sediment amendment,as proven by its considerable adsorption capacity for hydrophobic organic pollutants and accessibility,but its reliability when used for the removal of pollutants in natural sediments still needs to be evaluated.For example,the ageing process,resulting in changing of surface physicochemical properties of BC,will decrease the adsorption capacity and performance of BC when applied to sediment pollution control.In this study,how the ageing process and BC proportion affect the adsorption capacity of BC-sediment systems was modelled and quantitatively investigated to predict their adsorption capacity under different ageing times and BC additions.The results showed that the ageing process decreased the adsorption capacity of both BC-sediment systems,due to the blockage of the non-linear adsorption sites of BC.The adsorption capacity of rice straw black carbon(RC)-sediment systems was higher than that of fly ash black carbon(FC)-sediment systems,indicating that RC is more efficient than FC for nonylphenol(NP)pollution control in sediment.The newly established model for the prediction of adsorption capacity fits the experimental data appropriately and yields acceptable predictions,especially when based on parameters from the Freundlich model.However,to fully reflect the influence of the ageing process on BC-sediment systems and make more precise predictions,it is recommended that future work considering more factors and conditions,such as modelling of the correlation between the adsorption capacity and the pore volume or specific surface area of BC,be applied to build an accurate and sound model. | Guanghuan Cheng Han Liu Tailu Dong Qiuyu Li Mingyang Sun Liping Lou | 2021 | Journal of Environmental Sciences2021，33，4： | 0 |
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