9FA燃气轮机压气机叶片断裂故障及预防处理

介绍了几起9FA型燃气轮机压气机叶片断裂事故情况,分析R0级断裂原因为叶片第2阶振动落入kn共振区域,S1级断裂原因为叶片第7阶振动落入zn共振区域,与叶片设计、制造和安装因素有关。加强压气机定期检查可降低事故发生概率,对压气机升级改造可有效避免同类事故发生。

努力在新一轮改革中走在全省前列

党的十八届三中全会站在新的历史起点上,描绘了全面深化改革的新蓝图、新愿景、新目标,为全面深化改革提供了遵循,指明了方向。省委十届四次全会贯彻中央精神,全面系统地规划了当前和今后一个时期全省全面深化改革的目标任务、路线图、时间表,吹响了四川新时期全面深化改革的号角。面对新形势新任务。

A New Zero-Voltage Transition Power Factor Corrected Single-Phase Single-Stage AC-to-DC Converter

This paper presents a new ZVT （zero-voltage transition） single-stage ac-to-dc converter using PWM （pulse width modulation） and HF （high frequency） transformer isolation with capacitive output filter. In this converter a front-end power factor corrected boost stage integrates with a cascaded dc-to-dc bridge HF converter. The front-end boost converter operates in discontinuous current mode and ensures natural power factor correction with very simple control. The auxiliary circuit of this topology deals with very small power and is placed out of the main power path. As a result, the auxiliary circuit components have smaller power rating as opposed to main converter components. Also, output rectifier voltage is clamped to output voltage due to capacitive output filter. Identification and analyses of different operating modes of this converter are presented. Based on these analyses design example of a 50 kHz, 48 V, 1 kW ac-to-dc converter is presented. PSPICE simulation results of the designed converter are presented and explained to verify the performance of this converter.

常压固定床气化装置技术升级的方向和形势（上）

国家已经停止审批新上固定床间歇气化生产装置，固定床气化装置的应用方式已经步入新的转折阶段，如何科学选择新的气化工艺，是决定应用单位能否可持续发展的关键问题。

破解民企四难 壮大实体经济——浙江举行全省民营经济大会

"郁郁苍苍,生气勃勃,傲然屹立,不畏风霜。"这是陶铸《松树的风格》里的词句,如今用来形容在困境中坚持的浙江民营企业,很是贴切。1月30日,在电动车领域耕耘五六年的001集团董事长项青松脸上一直带着笑容,"省领导的话让我吃了定心丸,也让我的大产业梦想能实现了。"天空中飘着小雨,从全省各地赶来的民企老板们精神抖擞。