A new continuous catalytic reforming model was configured by using a molecule-based reactor module. Themodel was based on the Sinopec Research Institute of Petroleum Processing Co., Ltd. continuous catalytic reformer ...A new continuous catalytic reforming model was configured by using a molecule-based reactor module. Themodel was based on the Sinopec Research Institute of Petroleum Processing Co., Ltd. continuous catalytic reformer fullmodel, and was reduced to a size of 157 naphtha molecules (C1−C12) that underwent 764 reactions. The new model inheritedthe advantages of the original model, and had better solving performance and flexibility owing to support by the AspenHYSYS environment. Typical commercial plant data were selected for model validation, which showed advantages in theaccuracy of detailed predictions and the range of its application. In addition, the solving time was reduced from minutes toseconds. Therefore, the simplified model proved to be feasible for industrial application.展开更多
Determination of the wet-bulb temperature at the surface of a material is the basis of one class ofhumidity measuring instruments, and is important in industrial applications such as dryer modelling and simula-tion. T...Determination of the wet-bulb temperature at the surface of a material is the basis of one class ofhumidity measuring instruments, and is important in industrial applications such as dryer modelling and simula-tion. The psychrometer equation is a frequently used method of estimating wet-bulb temperature, and contains apsychrometer 'constant'. Analysis shows that this is in fact a variable coefficient affected by temperature, pressure,radiation and conduction effects, and the identity of the gas and vapour. Radiation and conduction affect the dif-ference between adiabatic saturation temperature and indicated wet-bulb temperature. Inconsistencies in currentlyrecommended values for the psychrometer coefficient, including published international standards, are identifiedand explained. Particular problems arise when the enhancement factor is applied to vapour pressure to accountfor non-ideality of gases. Special considerations are also needed for wet-bulb temperatures approaching the boilingpoint, where the psychrometer coefficient tends to zero. Self-consistent recommendations recently published in thenew British Standard BS1339 are given, which cover both the air-water system and a general vapour-gas system.展开更多
全面实时监测企业运行状态及市场环境,发现企业当前运行的问题,识别市场潜在机会,将企业关键变化信息及时地以适当的形式呈现给企业各个层次的相关决策者和执行者,是企业快速决策的关键。本文扩充了传统的企业绩效管理方法,通过拓展质...全面实时监测企业运行状态及市场环境,发现企业当前运行的问题,识别市场潜在机会,将企业关键变化信息及时地以适当的形式呈现给企业各个层次的相关决策者和执行者,是企业快速决策的关键。本文扩充了传统的企业绩效管理方法,通过拓展质量功能展开(Quality Function Deployment,QFD)方法,提出了新的用于过程企业绩效实时监测的智能QFD方法,该方法通过引入一套基于指标变化的且周期可配置的标准,通过特定时间周期内指标变量与标准的对比,动态地监测企业运行过程的变化,并基于用户角色及其执行的任务以适当的详细程度和格式为企业运作人员及时提供所需信息,以利于快速分析和决策。这种实时的企业绩效管理一方面随时发现企业内部运营的问题,同时识别市场和商业机会,对企业在竞争日益激烈的市场环境中做到“科学决策、优化运营和快速反应”起重要的作用。展开更多
基金The authors acknowledge collaboration with and support from AspenTech via the National Key R&D Program of China(2021YFA1501201).
文摘A new continuous catalytic reforming model was configured by using a molecule-based reactor module. Themodel was based on the Sinopec Research Institute of Petroleum Processing Co., Ltd. continuous catalytic reformer fullmodel, and was reduced to a size of 157 naphtha molecules (C1−C12) that underwent 764 reactions. The new model inheritedthe advantages of the original model, and had better solving performance and flexibility owing to support by the AspenHYSYS environment. Typical commercial plant data were selected for model validation, which showed advantages in theaccuracy of detailed predictions and the range of its application. In addition, the solving time was reduced from minutes toseconds. Therefore, the simplified model proved to be feasible for industrial application.
文摘Determination of the wet-bulb temperature at the surface of a material is the basis of one class ofhumidity measuring instruments, and is important in industrial applications such as dryer modelling and simula-tion. The psychrometer equation is a frequently used method of estimating wet-bulb temperature, and contains apsychrometer 'constant'. Analysis shows that this is in fact a variable coefficient affected by temperature, pressure,radiation and conduction effects, and the identity of the gas and vapour. Radiation and conduction affect the dif-ference between adiabatic saturation temperature and indicated wet-bulb temperature. Inconsistencies in currentlyrecommended values for the psychrometer coefficient, including published international standards, are identifiedand explained. Particular problems arise when the enhancement factor is applied to vapour pressure to accountfor non-ideality of gases. Special considerations are also needed for wet-bulb temperatures approaching the boilingpoint, where the psychrometer coefficient tends to zero. Self-consistent recommendations recently published in thenew British Standard BS1339 are given, which cover both the air-water system and a general vapour-gas system.
文摘全面实时监测企业运行状态及市场环境,发现企业当前运行的问题,识别市场潜在机会,将企业关键变化信息及时地以适当的形式呈现给企业各个层次的相关决策者和执行者,是企业快速决策的关键。本文扩充了传统的企业绩效管理方法,通过拓展质量功能展开(Quality Function Deployment,QFD)方法,提出了新的用于过程企业绩效实时监测的智能QFD方法,该方法通过引入一套基于指标变化的且周期可配置的标准,通过特定时间周期内指标变量与标准的对比,动态地监测企业运行过程的变化,并基于用户角色及其执行的任务以适当的详细程度和格式为企业运作人员及时提供所需信息,以利于快速分析和决策。这种实时的企业绩效管理一方面随时发现企业内部运营的问题,同时识别市场和商业机会,对企业在竞争日益激烈的市场环境中做到“科学决策、优化运营和快速反应”起重要的作用。
