Energy saving and emission reduction for railway systems should not only be studied from a technical perspective but should also be focused on management and economics. On the basis of relevant trainscheduling models ...Energy saving and emission reduction for railway systems should not only be studied from a technical perspective but should also be focused on management and economics. On the basis of relevant trainscheduling models for train operation management, in this paper we introduce an extended multi-objective trainscheduling optimization model considering locomotive assignment and segment emission constraints for energy saving. The objective of setting up this model is to reduce the energy and emission cost as well as total passenger- time. The decision variables include continuous variables such as train arrival and departure time, and binary vari- ables such as locomotive assignment and segment occu- pancy. The constraints are concerned with train movement, trip time, headway, and segment emission, etc. To obtain a non-dominated satisfactory solution on these objectives, a fuzzy multi-objective optimization algorithm is employed to solve the model. Finally, a numerical example is performed and used to compare the proposed model with the existing model. The results show that the proposed model can reduce the energy consumption, meet exhausts emission demands effectively by optimal locomotive assignment, and its solution methodology is effective.展开更多
基于相同的核算边界,分别构建采用A-D-E-RC法制浆联合生物质热电联产与常规碱法制浆联合燃煤热电联产的能量与碳排放模型。通过物流平衡及排放因子法联合实测数据测算出2种制浆联合厂的能耗及碳排放。结果表明,采用A-D-E-RC法制浆联合...基于相同的核算边界,分别构建采用A-D-E-RC法制浆联合生物质热电联产与常规碱法制浆联合燃煤热电联产的能量与碳排放模型。通过物流平衡及排放因子法联合实测数据测算出2种制浆联合厂的能耗及碳排放。结果表明,采用A-D-E-RC法制浆联合生物质热电联产工厂的单位产品能耗比常规碱法制浆联合工厂降低了26.8%。其中,碱回收单元降低了51.2%的能耗。采用A-D-E-RC法制浆联合生物质热电联产的单位产品碳排放量为1.72 t CO_(2)/Adt,且93.6%为生物质碳,总碳排放下降了31.6%,表明采用A-D-E-RC法制浆联合生物质热电联产具有显著的节能减排效应,为促进制浆联合企业的绿色可持续发展提供新的策略。展开更多
推进碳达峰和碳中和目标,对保护全球气候和环境都有重大和积极的意义。通过实例阐述了二氧化碳(CO_(2))回收液化技术在餐厨行业中应用的可行性,项目每年可减少CO_(2)排放720 t,环境效益显著。同时按液态CO_(2)市场价约400元/t的价格,可...推进碳达峰和碳中和目标,对保护全球气候和环境都有重大和积极的意义。通过实例阐述了二氧化碳(CO_(2))回收液化技术在餐厨行业中应用的可行性,项目每年可减少CO_(2)排放720 t,环境效益显著。同时按液态CO_(2)市场价约400元/t的价格,可形成年收益28.8万元。项目平均能耗272 k Wh/t,运行成本每天约为326.4元,折算年利润可达17万元,经济效果显著。展开更多
基金supported by the National Natural Science Foundation of China (No. 71101007)the National High Technology Research and Development Program of China (No. 2011AA110502)State Key Laboratory of Rail Traffic Control and Safety of Beijing Jiaotong University Program (RCS2010ZZ001)
文摘Energy saving and emission reduction for railway systems should not only be studied from a technical perspective but should also be focused on management and economics. On the basis of relevant trainscheduling models for train operation management, in this paper we introduce an extended multi-objective trainscheduling optimization model considering locomotive assignment and segment emission constraints for energy saving. The objective of setting up this model is to reduce the energy and emission cost as well as total passenger- time. The decision variables include continuous variables such as train arrival and departure time, and binary vari- ables such as locomotive assignment and segment occu- pancy. The constraints are concerned with train movement, trip time, headway, and segment emission, etc. To obtain a non-dominated satisfactory solution on these objectives, a fuzzy multi-objective optimization algorithm is employed to solve the model. Finally, a numerical example is performed and used to compare the proposed model with the existing model. The results show that the proposed model can reduce the energy consumption, meet exhausts emission demands effectively by optimal locomotive assignment, and its solution methodology is effective.
文摘基于相同的核算边界,分别构建采用A-D-E-RC法制浆联合生物质热电联产与常规碱法制浆联合燃煤热电联产的能量与碳排放模型。通过物流平衡及排放因子法联合实测数据测算出2种制浆联合厂的能耗及碳排放。结果表明,采用A-D-E-RC法制浆联合生物质热电联产工厂的单位产品能耗比常规碱法制浆联合工厂降低了26.8%。其中,碱回收单元降低了51.2%的能耗。采用A-D-E-RC法制浆联合生物质热电联产的单位产品碳排放量为1.72 t CO_(2)/Adt,且93.6%为生物质碳,总碳排放下降了31.6%,表明采用A-D-E-RC法制浆联合生物质热电联产具有显著的节能减排效应,为促进制浆联合企业的绿色可持续发展提供新的策略。
文摘推进碳达峰和碳中和目标,对保护全球气候和环境都有重大和积极的意义。通过实例阐述了二氧化碳(CO_(2))回收液化技术在餐厨行业中应用的可行性,项目每年可减少CO_(2)排放720 t,环境效益显著。同时按液态CO_(2)市场价约400元/t的价格,可形成年收益28.8万元。项目平均能耗272 k Wh/t,运行成本每天约为326.4元,折算年利润可达17万元,经济效果显著。
