This paper presents a model of fatigue crack growth in a welded joint and a two-dimensional model of anodic dissolution based on Donahue model and anodic dissolution mechanism,respectively.In addition,a model for pred...This paper presents a model of fatigue crack growth in a welded joint and a two-dimensional model of anodic dissolution based on Donahue model and anodic dissolution mechanism,respectively.In addition,a model for predicting the corrosion fatigue crack growth rate in welded joints of steel marine structures is established and crack growth mechanisms are analyzed.The results show that during early stages of crack growth,corrosion fatigue crack growth rate in welded joints is mainly controlled by corrosion action,whereas cyclic loading becomes more influential during the later stage of crack propagation.Loading frequency and effective stress ratio can affect rupture period of protective film at the corrosion fatigue crack tip and the length of corrosion crack increment,respectively,which changes the influence of corrosion action on crack growth rate.However,the impact of stress amplitude on crack growth rate is only significant when crack propagation is caused by cyclic loading.Welding residual stress not only improves the effective stress ratio of cyclic loading,but also promotes crack closure and increases corrosion fatigue crack growth rate in welded joints.Compared to corrosion action,welding residual stress has a more significant influence on crack growth caused by cyclic loading.展开更多
针对中国西北矿区存在的可再生能源消纳率低、碳排放量高及运行经济性欠佳等问题,提出一种考虑阶梯碳-绿证互认与重力储能的矿区综合能源系统(coal mine integrated energy system,CMIES)优化调度模型。首先,考虑煤层气、废弃矿井重力...针对中国西北矿区存在的可再生能源消纳率低、碳排放量高及运行经济性欠佳等问题,提出一种考虑阶梯碳-绿证互认与重力储能的矿区综合能源系统(coal mine integrated energy system,CMIES)优化调度模型。首先,考虑煤层气、废弃矿井重力储能等矿区资源的多元利用,建立CMIES基本模型。其次,为提升CMIES的经济效益和能源利用率,在CMIES中加入碳捕集、电转气和冷热电联产机组等耦合设备,并建立电-热-冷柔性负荷模型以提高系统调节能力。然后,引入阶梯碳-绿证互认机制,通过市场交互促进新能源设备出力。最后,以系统总运行成本最小为目标构建混合整数规划模型并通过Cplex进行求解。仿真结果表明,该模型可显著提升矿区可再生能源消纳率,降低系统碳排放量,同时兼顾系统运行经济性,为CMIES低碳经济化转型提供理论支撑。展开更多
随着新型电力系统和能源互联的持续推进,构建高效、低碳和经济的能源供应系统对发展双碳战略至关重要。为此,提出一种绿证—碳交易联合机制下考虑多类型需求响应和氢能多元利用的综合能源系统(integrated energy system,IES)优化运行策...随着新型电力系统和能源互联的持续推进,构建高效、低碳和经济的能源供应系统对发展双碳战略至关重要。为此,提出一种绿证—碳交易联合机制下考虑多类型需求响应和氢能多元利用的综合能源系统(integrated energy system,IES)优化运行策略。首先,为充分发挥需求侧资源的调节能力,构建含价格型、激励型和替代型的多类型需求响应模型。其次,针对氢能的清洁特性,构建含电制氢、氢制甲烷、氢转热电和天然气混氢的氢能多元利用模型。最后,将绿证交易和碳交易相结合,提出绿证—碳联合交易机制,并构建计及绿证—碳联合交易机制的IES低碳经济运行模型。算例仿真设置不同运行方案对比,验证该文所提模型在提升可再生能源消纳、能源利用效率和降低碳排放量等方面的有效性。展开更多
基金Project(2018M643852)supported by the Postdoctoral Science Foundation of ChinaProjects(30110010403,30110030103)supported by Equipment Pre-Research Project,ChinaProject(51979280)supported by the National Natural Science Foundation of China。
文摘This paper presents a model of fatigue crack growth in a welded joint and a two-dimensional model of anodic dissolution based on Donahue model and anodic dissolution mechanism,respectively.In addition,a model for predicting the corrosion fatigue crack growth rate in welded joints of steel marine structures is established and crack growth mechanisms are analyzed.The results show that during early stages of crack growth,corrosion fatigue crack growth rate in welded joints is mainly controlled by corrosion action,whereas cyclic loading becomes more influential during the later stage of crack propagation.Loading frequency and effective stress ratio can affect rupture period of protective film at the corrosion fatigue crack tip and the length of corrosion crack increment,respectively,which changes the influence of corrosion action on crack growth rate.However,the impact of stress amplitude on crack growth rate is only significant when crack propagation is caused by cyclic loading.Welding residual stress not only improves the effective stress ratio of cyclic loading,but also promotes crack closure and increases corrosion fatigue crack growth rate in welded joints.Compared to corrosion action,welding residual stress has a more significant influence on crack growth caused by cyclic loading.
文摘针对中国西北矿区存在的可再生能源消纳率低、碳排放量高及运行经济性欠佳等问题,提出一种考虑阶梯碳-绿证互认与重力储能的矿区综合能源系统(coal mine integrated energy system,CMIES)优化调度模型。首先,考虑煤层气、废弃矿井重力储能等矿区资源的多元利用,建立CMIES基本模型。其次,为提升CMIES的经济效益和能源利用率,在CMIES中加入碳捕集、电转气和冷热电联产机组等耦合设备,并建立电-热-冷柔性负荷模型以提高系统调节能力。然后,引入阶梯碳-绿证互认机制,通过市场交互促进新能源设备出力。最后,以系统总运行成本最小为目标构建混合整数规划模型并通过Cplex进行求解。仿真结果表明,该模型可显著提升矿区可再生能源消纳率,降低系统碳排放量,同时兼顾系统运行经济性,为CMIES低碳经济化转型提供理论支撑。
文摘随着新型电力系统和能源互联的持续推进,构建高效、低碳和经济的能源供应系统对发展双碳战略至关重要。为此,提出一种绿证—碳交易联合机制下考虑多类型需求响应和氢能多元利用的综合能源系统(integrated energy system,IES)优化运行策略。首先,为充分发挥需求侧资源的调节能力,构建含价格型、激励型和替代型的多类型需求响应模型。其次,针对氢能的清洁特性,构建含电制氢、氢制甲烷、氢转热电和天然气混氢的氢能多元利用模型。最后,将绿证交易和碳交易相结合,提出绿证—碳联合交易机制,并构建计及绿证—碳联合交易机制的IES低碳经济运行模型。算例仿真设置不同运行方案对比,验证该文所提模型在提升可再生能源消纳、能源利用效率和降低碳排放量等方面的有效性。
