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电站汽轮机阀门关闭超时问题分析与解决方案研究 被引量:7
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作者 苏耀国 李云 王炳淇 《汽轮机技术》 北大核心 2018年第2期142-146,共5页
电站阀门关闭超时可能导致汽轮机在停机或甩负荷时超速,是影响机组安全的重要问题。许多电厂在做主汽阀、调节阀和抽汽逆止阀的关闭时间测试试验的过程中,都发现了本厂存在不同程度上的阀门关闭超时问题。从机械和热工两个方面对主汽阀... 电站阀门关闭超时可能导致汽轮机在停机或甩负荷时超速,是影响机组安全的重要问题。许多电厂在做主汽阀、调节阀和抽汽逆止阀的关闭时间测试试验的过程中,都发现了本厂存在不同程度上的阀门关闭超时问题。从机械和热工两个方面对主汽阀、调节阀和抽汽逆止阀的关闭超时问题进行了分析,并提出了可行的解决方案,为各电厂解决超速隐患问题提供借鉴和参考。 展开更多
关键词 热工 机械 阀门关闭超时 问题分析 解决方案
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核电站主蒸汽隔离阀关闭超时分析及改进 被引量:3
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作者 葛龙辉 《设备管理与维修》 2022年第9期71-74,共4页
从主蒸汽隔离阀作用原理入手,分析热试期间主蒸汽隔离阀关闭超时产生的原因,通过对排水管线疏通及动态加热排气等辅助手段,使之达到正常工况下的运行参数,保证主蒸汽隔离阀关闭试验的时间要求,满足验收准则,为解决隔离阀关闭超时问题提... 从主蒸汽隔离阀作用原理入手,分析热试期间主蒸汽隔离阀关闭超时产生的原因,通过对排水管线疏通及动态加热排气等辅助手段,使之达到正常工况下的运行参数,保证主蒸汽隔离阀关闭试验的时间要求,满足验收准则,为解决隔离阀关闭超时问题提供经验基础。 展开更多
关键词 核电站 主蒸汽隔离阀 关闭超时
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Minimally Invasive Perventricular Device Closure of Ventricular Septal Defect: a Comparative Study in 80 Patients 被引量:7
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作者 Xin-chao Yang De-bin Liu 《Chinese Medical Sciences Journal》 CAS CSCD 2014年第2期98-102,共5页
Objective To evaluate the efficacy of minimally invasive perventricular device closure of ventricular septal defect(VSD). Methods Between September 2011 and February 2013, we collected 40 patients who underwent perven... Objective To evaluate the efficacy of minimally invasive perventricular device closure of ventricular septal defect(VSD). Methods Between September 2011 and February 2013, we collected 40 patients who underwent perventricular closure via a small lower sternal incision(minimally invasive group), aged 15.5±3.5 years(12 months to 32 years) with a body weight of 24.2±7.5 kg(10.8-58.0 kg). The mean size of VSD was 5.6±0.5 mm(2-14 mm). Another 40 patients were included as the surgical group, receiving the conventional surgical repair of VSD. The device of the minimally invasive group was released under the guidance of transesophageal echocardiography. Success rate, cardiac indicators, and clinical outcomes of the 2 groups were compared. Results The patients in the surgical group and those in the minimally invasive group showed similar results in success rate(both 97.5%). The procedure time, intensive care unit stay, hospital stay, and postoperative recovery time in the minimally invasive group were significantly shorter than those in the surgical group(58±21 minutes versus 145±26 minutes, 2±1 days versus 8±3 days, 5±1 days versus 16±6 days, 3±1 days versus 90±20 days, all P<0.05). The minimally invasive group had a higher incidence of conduction anomalies(17.5% versus 2.5%, P<0.05). In the follow-up period of 3-12 months, there was no new residual shunt, noticeable aortic regurgitation, significant arrhythmias, or device failure except for new complications in the surgical group. Conclusions The success rate of minimally invasive perventricular device closure of VSD under transesophageal echocardiography guidance is similar to that of conventional surgical repair, but the short-term outcomes of the minimally invasive approach is much better. Long-term follow-up is necessary to confirm the effectiveness of this technique. 展开更多
关键词 transesophageal echocardiography minimally invasive ventricular septal defect
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