为了应对气候变化,推动能源电力碳达峰、碳中和进程,提出一种以电解熔融盐(electrolyticmoltencarbonate,EMC)技术为基础的EMC碳捕集电厂,并且考虑了碳捕集与封存(carbon capture and storage,CCS)技术以及两段式电转气(power to gas,P2...为了应对气候变化,推动能源电力碳达峰、碳中和进程,提出一种以电解熔融盐(electrolyticmoltencarbonate,EMC)技术为基础的EMC碳捕集电厂,并且考虑了碳捕集与封存(carbon capture and storage,CCS)技术以及两段式电转气(power to gas,P2G),建立了基于CCS-P2G-EMC协同的虚拟电厂(virtual power plant,VPP)优化调度模型。首先,根据EMC技术的原理,考虑与燃气轮机热电联产(combined heatandpower,CHP)机组耦合,建立了EMC碳捕集电厂数学模型,并分析了EMC碳捕集电厂热电出力的灵活性。其次,构建了CCS-P2G-EMC协同框架,并对其低碳特性机理进行分析,并在此基础上建立低碳经济调度模型,实现了VPP的低碳经济运行。最后,通过设置不同场景进行对比,验证了所提调度模型的有效性,可在保证VPP经济效益的同时降低系统碳排放。展开更多
The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electro...The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electrolyte,Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3),utilizing cyclic voltammetry and square wave voltammetry techniques.The results show that Fe(Ⅲ)reduction occurs in two steps:Fe(Ⅲ)+e^(−)→Fe(Ⅱ),Fe(Ⅱ)+2e^(−)→Fe,and that the redox process of Fe(Ⅲ)/Fe(Ⅱ)at the tungsten electrode is an irreversible reaction controlled by diffusion.The diffusion coefficients of Fe(Ⅲ)in the molten Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3)in the temperature range of 1248–1278 K are between 1.86×10^(−6)cm^(2)/s and 1.58×10^(−4)cm^(2)/s.The diffusion activation energy of Fe(Ⅲ)in the molten salt is 1825.41 kJ/mol.As confirmed by XRD analysis,potentiostatic electrolysis at−0.857 V(vs.O_(2)/O_(complex)^(2-))for 6 h produces metallic iron on the cathode.展开更多
Determination of dissolution rate of alumina is one of the classical problems in aluminum electrolysis. A novel method which can measure the dissolution rate of alumina was presented. Effect of factors on dissolution ...Determination of dissolution rate of alumina is one of the classical problems in aluminum electrolysis. A novel method which can measure the dissolution rate of alumina was presented. Effect of factors on dissolution rate of alumina was studied intuitively and roundly using transparent quartz electrobath and image analysis techniques. Images about dissolution process of alumina were taken at an interval of fixed time from transparent quartz electrobath of double rooms. Gabor wavelet transforms were used for extracting and describing the texture features of each image. After subsampling several times, the dissolution rate of alumina was computed using these texture features in local neighborhood of samples. Regression equation of the dissolution rate of alumina was obtained using these dissolution rates. Experiments show that the regression equation of the dissolution rate of alumina is y=-0.000 5x^3＋0.024 0x^2-0.287 3x＋ 1.276 7 for Na3AIF6-AIF3-Al2O3-CaF2-LiF- MgF2 system at 920 ℃.展开更多
文摘为了应对气候变化,推动能源电力碳达峰、碳中和进程,提出一种以电解熔融盐(electrolyticmoltencarbonate,EMC)技术为基础的EMC碳捕集电厂,并且考虑了碳捕集与封存(carbon capture and storage,CCS)技术以及两段式电转气(power to gas,P2G),建立了基于CCS-P2G-EMC协同的虚拟电厂(virtual power plant,VPP)优化调度模型。首先,根据EMC技术的原理,考虑与燃气轮机热电联产(combined heatandpower,CHP)机组耦合,建立了EMC碳捕集电厂数学模型,并分析了EMC碳捕集电厂热电出力的灵活性。其次,构建了CCS-P2G-EMC协同框架,并对其低碳特性机理进行分析,并在此基础上建立低碳经济调度模型,实现了VPP的低碳经济运行。最后,通过设置不同场景进行对比,验证了所提调度模型的有效性,可在保证VPP经济效益的同时降低系统碳排放。
基金Project(52074084)supported by the National Natural Science Foundation of China。
文摘The high-temperature requirement for liquid iron smelting via molten oxide electrolysis presents significant challenges.This study investigates the electrochemical reduction of Fe(Ⅲ)in a novel low-temperature electrolyte,Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3),utilizing cyclic voltammetry and square wave voltammetry techniques.The results show that Fe(Ⅲ)reduction occurs in two steps:Fe(Ⅲ)+e^(−)→Fe(Ⅱ),Fe(Ⅱ)+2e^(−)→Fe,and that the redox process of Fe(Ⅲ)/Fe(Ⅱ)at the tungsten electrode is an irreversible reaction controlled by diffusion.The diffusion coefficients of Fe(Ⅲ)in the molten Na_(2)SiO_(3)-SiO_(2)-Fe_(2)O_(3)in the temperature range of 1248–1278 K are between 1.86×10^(−6)cm^(2)/s and 1.58×10^(−4)cm^(2)/s.The diffusion activation energy of Fe(Ⅲ)in the molten salt is 1825.41 kJ/mol.As confirmed by XRD analysis,potentiostatic electrolysis at−0.857 V(vs.O_(2)/O_(complex)^(2-))for 6 h produces metallic iron on the cathode.
基金Projects(51101104,51072121) supported by the National Natural Science Foundation of ChinaProject(LS2010109) supported by the Key Laboratory Foundation of Liaoning Province,China
文摘Determination of dissolution rate of alumina is one of the classical problems in aluminum electrolysis. A novel method which can measure the dissolution rate of alumina was presented. Effect of factors on dissolution rate of alumina was studied intuitively and roundly using transparent quartz electrobath and image analysis techniques. Images about dissolution process of alumina were taken at an interval of fixed time from transparent quartz electrobath of double rooms. Gabor wavelet transforms were used for extracting and describing the texture features of each image. After subsampling several times, the dissolution rate of alumina was computed using these texture features in local neighborhood of samples. Regression equation of the dissolution rate of alumina was obtained using these dissolution rates. Experiments show that the regression equation of the dissolution rate of alumina is y=-0.000 5x^3＋0.024 0x^2-0.287 3x＋ 1.276 7 for Na3AIF6-AIF3-Al2O3-CaF2-LiF- MgF2 system at 920 ℃.
