首先针对两重化、双两重化、三重化以及双三重化这四种系统架构下的安全仪表系统的要求时平均危险失效率(Average Probability of Dangerous Failure on Demand,PFDavg)、误跳车率(Spurious Trip Rate,STR)以及生命周期成本(Life Circle...首先针对两重化、双两重化、三重化以及双三重化这四种系统架构下的安全仪表系统的要求时平均危险失效率(Average Probability of Dangerous Failure on Demand,PFDavg)、误跳车率(Spurious Trip Rate,STR)以及生命周期成本(Life Circle Cost,LCC)进行多目标模型分析。并结合工控行业实际情况,分析单重架构Moo N及双重架构2×Moo N的各指标的差异,结果表明两重化架构下的误跳车率是其他三种架构下的近100倍。基于此再进一步分析现场需要的备件数量,以及在双两重化和三重化架构下生命周期成本。展开更多
The current separator with air dense medium fluidized bed can only turn out two products at the same time with a single separating density. The double density fluidized bed means that two separating areas with differe...The current separator with air dense medium fluidized bed can only turn out two products at the same time with a single separating density. The double density fluidized bed means that two separating areas with different densities are formed in a fluidized cascade. In each separating area, the bed density is uniform and meets the technical requirement of coal preparation respectively. Therefore, the processed materials can be separated into three products according to density. In this paper, the fluidized behaviors of binary dense media were experimentally studied and the distribution characteristics of particle concentration and bed density in different bed structure were discussed. The segregation and mixing mechanisms of binary dense media were analyzed. It was testified that the pyramidal part designed in the bed structure played a key role in the formation of double density fluidized bed. The pyramidal part intensified the segregation of binary particles between two separating areas and strengthened the mixing in the low density area, which made for the density uniform of the area.展开更多
文摘首先针对两重化、双两重化、三重化以及双三重化这四种系统架构下的安全仪表系统的要求时平均危险失效率(Average Probability of Dangerous Failure on Demand,PFDavg)、误跳车率(Spurious Trip Rate,STR)以及生命周期成本(Life Circle Cost,LCC)进行多目标模型分析。并结合工控行业实际情况,分析单重架构Moo N及双重架构2×Moo N的各指标的差异,结果表明两重化架构下的误跳车率是其他三种架构下的近100倍。基于此再进一步分析现场需要的备件数量,以及在双两重化和三重化架构下生命周期成本。
文摘The current separator with air dense medium fluidized bed can only turn out two products at the same time with a single separating density. The double density fluidized bed means that two separating areas with different densities are formed in a fluidized cascade. In each separating area, the bed density is uniform and meets the technical requirement of coal preparation respectively. Therefore, the processed materials can be separated into three products according to density. In this paper, the fluidized behaviors of binary dense media were experimentally studied and the distribution characteristics of particle concentration and bed density in different bed structure were discussed. The segregation and mixing mechanisms of binary dense media were analyzed. It was testified that the pyramidal part designed in the bed structure played a key role in the formation of double density fluidized bed. The pyramidal part intensified the segregation of binary particles between two separating areas and strengthened the mixing in the low density area, which made for the density uniform of the area.
