利用流程模拟软件Aspen Plus 10,借助系统模型推荐,选择Chao-Seader和Garyson-Streed热力学模型对中国石化茂名分公司4号柴油加氢装置分馏部分进行了模拟分析与优化,结果表明模拟计算结果与装置实际运行数据吻合良好。通过对分馏塔冷、...利用流程模拟软件Aspen Plus 10,借助系统模型推荐,选择Chao-Seader和Garyson-Streed热力学模型对中国石化茂名分公司4号柴油加氢装置分馏部分进行了模拟分析与优化,结果表明模拟计算结果与装置实际运行数据吻合良好。通过对分馏塔冷、热低压分离器油(简称低分油)进料位置及进料温度进行分析优化,同时配合换热流程匹配调整,以及冷、热低分油单独进塔改造,使得冷低分油换热终温提升至210℃,分馏过程汽提蒸汽流量减少1.7 t/h,节能效果显著。展开更多
A stable CMOS low drop-out regulator without an off-chip capacitor for system-on-chip application is presen- ted. By using an on-chip pole splitting technique and an on-chip pole-zero canceling technique, high stabili...A stable CMOS low drop-out regulator without an off-chip capacitor for system-on-chip application is presen- ted. By using an on-chip pole splitting technique and an on-chip pole-zero canceling technique, high stability is achieved without an off-chip capacitor. The chip was implemented in CSMC＇s 0.5μm CMOS technology and the die area is 600μm×480μm. The error of the output voltage due to line variation is less than -＋ 0.21% ,and the quiescent current is 39.8μA. The power supply rejection ratio at 100kHz is -33.9dB, and the output noise spectral densities at 100Hz and 100kHz are 1.65 and 0.89μV √Hz, respectively.展开更多
For the design of pressurized circulating fluidized beds, experiments were conducted in a small cyclone with 120 mm in diameter and 300 mm in height at high pressures and at atmospheric temperatures. Influence of air ...For the design of pressurized circulating fluidized beds, experiments were conducted in a small cyclone with 120 mm in diameter and 300 mm in height at high pressures and at atmospheric temperatures. Influence of air leakage from the stand pipe into the cyclone was specially focused. A semi-empirical model was developed for the prediction of the pressure drop of the cyclone separator at different operate pressures with the effect of air leakage and inlet solid loading. The operate pressure, air leakage and inlet solid loading act as significant roles in cyclone pressure drop. The pressure drop increases with the increasing of pressure and decreases with the increasing of the flow rate of air leakage from the standpipe and with the increasing of the inlet solid loading.展开更多
文摘利用流程模拟软件Aspen Plus 10,借助系统模型推荐,选择Chao-Seader和Garyson-Streed热力学模型对中国石化茂名分公司4号柴油加氢装置分馏部分进行了模拟分析与优化,结果表明模拟计算结果与装置实际运行数据吻合良好。通过对分馏塔冷、热低压分离器油(简称低分油)进料位置及进料温度进行分析优化,同时配合换热流程匹配调整,以及冷、热低分油单独进塔改造,使得冷低分油换热终温提升至210℃,分馏过程汽提蒸汽流量减少1.7 t/h,节能效果显著。
文摘A stable CMOS low drop-out regulator without an off-chip capacitor for system-on-chip application is presen- ted. By using an on-chip pole splitting technique and an on-chip pole-zero canceling technique, high stability is achieved without an off-chip capacitor. The chip was implemented in CSMC＇s 0.5μm CMOS technology and the die area is 600μm×480μm. The error of the output voltage due to line variation is less than -＋ 0.21% ,and the quiescent current is 39.8μA. The power supply rejection ratio at 100kHz is -33.9dB, and the output noise spectral densities at 100Hz and 100kHz are 1.65 and 0.89μV √Hz, respectively.
基金Financial support from The Ministry of Science and Technology of China (Contract No.2003AA529220)
文摘For the design of pressurized circulating fluidized beds, experiments were conducted in a small cyclone with 120 mm in diameter and 300 mm in height at high pressures and at atmospheric temperatures. Influence of air leakage from the stand pipe into the cyclone was specially focused. A semi-empirical model was developed for the prediction of the pressure drop of the cyclone separator at different operate pressures with the effect of air leakage and inlet solid loading. The operate pressure, air leakage and inlet solid loading act as significant roles in cyclone pressure drop. The pressure drop increases with the increasing of pressure and decreases with the increasing of the flow rate of air leakage from the standpipe and with the increasing of the inlet solid loading.
