Current research and ways of capturing mechanical energy are discussed in this paper. By the aid of the comprehensive thermodynamic analysis and Aspen simulation tool, the amount of a vailable work that can be produc...Current research and ways of capturing mechanical energy are discussed in this paper. By the aid of the comprehensive thermodynamic analysis and Aspen simulation tool, the amount of a vailable work that can be produced from capturing the pressure energy has been calculated. Based on the comprehensive thermodynamic analysis, two systems have been proposed to capture pressure energy of natural gas to generate electricity. In this study, the expression of exergy is given which can be used in evaluating purposes. A problem with this multidisciplinary study is the complicated boundary condition. In conclusion, a technical prospect on recoverable natural gas pressure energy has been presented based on total energy system theory.展开更多
磷酸铁锂(LFP)电池产量在我国处于领先地位,伴随着其产量的增加,资源耗竭潜力日渐增大,有必要对LFP电池的资源消耗强度进行评估。目前生命周期评价影响评价过程中有众多资源耗竭特征化方法。在本研究中,选取非生物资源耗竭潜值(ADP)、...磷酸铁锂(LFP)电池产量在我国处于领先地位,伴随着其产量的增加,资源耗竭潜力日渐增大,有必要对LFP电池的资源消耗强度进行评估。目前生命周期评价影响评价过程中有众多资源耗竭特征化方法。在本研究中,选取非生物资源耗竭潜值(ADP)、人为储量扩展的非生物资源耗竭潜值(AADP)、盈余矿石潜力(SOP)、热力学稀有度(TheRy)和累计㶲需求(CExD)五种方法评价LFP电池的资源消耗情况。结果表明:LFP电池生产过程的ADP值为2.29E-01 kg Sb eq,其中BMS制备过程的贡献最高,占85.24%,金为主要贡献资源;AADP值为2.38E-03 kg Sb eq,电池正极制备过程的贡献最高,占50.75%,镉为主要贡献资源;SOP值为1.26E+01 kg Cu eq,电池负极制备过程和正极制备过程的贡献均较高,分别占48.53%和44.82%,锂和石墨为主要贡献资源;TheRy值为3.18E+03 MJ,电池正极制备过程的贡献最高,占55.40%,铝和锂为主要贡献资源;CExD值为2.91E+02 MJ,电池负极制备过程的贡献最高,占56.19%,铜为主要贡献资源。展开更多
This study compares the results from the thermodynamic analysis at an Organic Rankine Cycle power plant,for first and second law efficiency,operating with 14 different working fluids.This plant—located in the town of...This study compares the results from the thermodynamic analysis at an Organic Rankine Cycle power plant,for first and second law efficiency,operating with 14 different working fluids.This plant—located in the town of Los Negritos,in the municipality of Villamar,in the State of Michoacán,Mexico—uses heat from a low-temperature geothermal source with the purpose of identifying the working fluids that are best suited for the operating conditions at hand.REFPROP v.8.0 software was used to collect the thermodynamic properties.Of all the thermodynamic parameters that were analyzed,the fluid that performed the best had an overall energy efficiency of 5.87%,an overall exergy efficiency of 43.07%,and a net output power of 13.04 kWe.展开更多
搭建了以自行研发的向心透平为膨胀机的ORC低温余热发电系统实验平台,研究了R123质量流量对循环系统的性能影响。结果表明:液压隔膜泵的温升和熵增均较小,所消耗的功率随流量的增加而增加。工质在蒸发器内的压降明显大于冷凝器内的压降...搭建了以自行研发的向心透平为膨胀机的ORC低温余热发电系统实验平台,研究了R123质量流量对循环系统的性能影响。结果表明:液压隔膜泵的温升和熵增均较小,所消耗的功率随流量的增加而增加。工质在蒸发器内的压降明显大于冷凝器内的压降,均随流量的增加而增加;向心透平的等熵效率随质量流量的增加先增加后减小,存在最佳流量0.215 kg·s-1使透平等熵效率达到最大值0.775;系统输出的电功率随流量的增加而增加,流量为0.283 kg·s-1时输出系统最大功率为2.009 k W;蒸发器的?损率占系统总?损率的比重最大,冷凝器次之,向心透平第三,在本实验最佳质量流量下,三者的?损率分别为62%、32%、6%。展开更多
基金Supported by Tianjin Institute of Urban Construction(03046)
文摘Current research and ways of capturing mechanical energy are discussed in this paper. By the aid of the comprehensive thermodynamic analysis and Aspen simulation tool, the amount of a vailable work that can be produced from capturing the pressure energy has been calculated. Based on the comprehensive thermodynamic analysis, two systems have been proposed to capture pressure energy of natural gas to generate electricity. In this study, the expression of exergy is given which can be used in evaluating purposes. A problem with this multidisciplinary study is the complicated boundary condition. In conclusion, a technical prospect on recoverable natural gas pressure energy has been presented based on total energy system theory.
文摘磷酸铁锂(LFP)电池产量在我国处于领先地位,伴随着其产量的增加,资源耗竭潜力日渐增大,有必要对LFP电池的资源消耗强度进行评估。目前生命周期评价影响评价过程中有众多资源耗竭特征化方法。在本研究中,选取非生物资源耗竭潜值(ADP)、人为储量扩展的非生物资源耗竭潜值(AADP)、盈余矿石潜力(SOP)、热力学稀有度(TheRy)和累计㶲需求(CExD)五种方法评价LFP电池的资源消耗情况。结果表明:LFP电池生产过程的ADP值为2.29E-01 kg Sb eq,其中BMS制备过程的贡献最高,占85.24%,金为主要贡献资源;AADP值为2.38E-03 kg Sb eq,电池正极制备过程的贡献最高,占50.75%,镉为主要贡献资源;SOP值为1.26E+01 kg Cu eq,电池负极制备过程和正极制备过程的贡献均较高,分别占48.53%和44.82%,锂和石墨为主要贡献资源;TheRy值为3.18E+03 MJ,电池正极制备过程的贡献最高,占55.40%,铝和锂为主要贡献资源;CExD值为2.91E+02 MJ,电池负极制备过程的贡献最高,占56.19%,铜为主要贡献资源。
文摘This study compares the results from the thermodynamic analysis at an Organic Rankine Cycle power plant,for first and second law efficiency,operating with 14 different working fluids.This plant—located in the town of Los Negritos,in the municipality of Villamar,in the State of Michoacán,Mexico—uses heat from a low-temperature geothermal source with the purpose of identifying the working fluids that are best suited for the operating conditions at hand.REFPROP v.8.0 software was used to collect the thermodynamic properties.Of all the thermodynamic parameters that were analyzed,the fluid that performed the best had an overall energy efficiency of 5.87%,an overall exergy efficiency of 43.07%,and a net output power of 13.04 kWe.
文摘搭建了以自行研发的向心透平为膨胀机的ORC低温余热发电系统实验平台,研究了R123质量流量对循环系统的性能影响。结果表明:液压隔膜泵的温升和熵增均较小,所消耗的功率随流量的增加而增加。工质在蒸发器内的压降明显大于冷凝器内的压降,均随流量的增加而增加;向心透平的等熵效率随质量流量的增加先增加后减小,存在最佳流量0.215 kg·s-1使透平等熵效率达到最大值0.775;系统输出的电功率随流量的增加而增加,流量为0.283 kg·s-1时输出系统最大功率为2.009 k W;蒸发器的?损率占系统总?损率的比重最大,冷凝器次之,向心透平第三,在本实验最佳质量流量下,三者的?损率分别为62%、32%、6%。
