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润滑油净化箱溢油原因分析及改进建议

2021-03-05张传宗

科技创新导报 2021年27期
关键词:汽轮机发电机

张传宗

摘要:润滑油净化系统是润滑油系统的重要组成部分,润滑油系统在机组正常运行或停役检修期间为汽轮发电机和其它油辅助系统供油,而润滑油净化系统通过对润滑油进行净化处理,保证润滑油长期运行不变质,延长润滑油的使用寿命,同时间接保证机组的安全、可靠运行;同时,国内某电厂润滑油净化箱曾多次发生溢油事件,溢油的发生不仅使润滑油系统油量减少,润滑油脏污,增加润滑油后续处理的工作量;还给机组的安全运行带来隐患。鉴于此,本文通过深入分析润滑油净化箱典型溢油事件,找出导致其溢油的原因,为避免溢油事件的再次发生提出改进建议。

关键词:润滑油  净化  溢油事件  汽轮机  发电机

Cause Analysis and Improvement Suggestions

of Oil Spilling in Lubricating Oil Purification Tank

ZHANG Chuanzong

(Qinshan Nuclear Power, Haiyan, Zhejiang Province, 314300 China)

Abstract: Lubricating oil purification system is an important part of the lubricating oil system, which provides oil supply to the steam turbine generator and other oil auxiliary system during normal operation or outage. Through the purification, the lubricating oil purification system ensures the long-term operation of lubricating oil without deterioration to prolong the service life of lubricating oil. Therefore, the system indirectly ensures the safe and reliable operation of the unit.The events of oil spills in the lubricating oil purification tank repeatedly happened at one domestic power plant. The occurrence of oil spills not only reduces the oil volume of the lubricating oil system, the lubricating oil is dirty, and increases the workload of subsequent treatment of lubricating oil; It also brings hidden dangers to the safe operation of the unit. In view of this, this paper deeply analyzes the typical oil spill events of lubricating oil purification tank, finds out the causes of oil spill, and puts forward improvement suggestions to avoid the recurrence of oil spill events.

Key Words: Lubricating oil; Purification; Oil spill event; Turbine; Generator

1 潤滑油净化系统概述

润滑油净化系统简要流程如图1所示。

系统主要包括一台润滑油净化器、一台循环油泵、一台排烟风机、净化器入口液位控制阀、相互间连接的管道、阀门、仪表等组成[1]。润滑油净化器是系统的核心,其布置比主油箱低一层,因此,润滑油靠重力溢流入油净化器,净化后的油通过循环油泵打回主油箱形成循环。

正常运行时,净化器入口液位控制阀、循环油泵的操作手柄都在自动位置(AUTO),系统处于自动运行状态。

2 系统溢油事件分析

事件1

2008年6月1日,针对国内某电厂2台机组启动以来,润滑油净化箱多次发生液位高报的情况,仪控人员在现场持续观察系统的运行。从全天观察的情况看,净化箱油位确实一直处在高位,循环泵工作,液位控制阀在高油位信号触发后迅速关闭,当油位下降,油位开关复位后,该阀迅速打开,同时主控室报警不断的触发和消报。……

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