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Avoidable and Non-Avoidable Failures in Power Plants

机译：发电厂中可避免和不可避免的故障

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Many of the causes of Power Plant failures are widely known but still not avoided. In some cases, environmental factors are less obvious and cause unexpected failures. 1) Unexpected failure of a Waste Heat Recovery Unit (WHRU): The unit failed prematurely in six months. The root cause of the failure was corrosive attack of the tube ends at the tube sheath weld joints at the exhaust outlet due to sulfuric acid. Gas entering the Heat Exchanger (HE) was ～873℉ and gas exiting was ～350℉. It is well-known that HE operating temperatures should be outside the dew point (～300℉) of sulfuric acid. 2) Unexpected failure of HRSG LP carbon steel economizer tubes due to SCC in three years. Ammonium nitrate salts on the OD of the finned tubes was the likely aggressive species. This is a known environment to cause SCC of carbon steel tubes.
机译：发电厂故障的许多原因都是广泛的已知但仍然无法避免。在某些情况下，环境因素不太明显，并导致意外失败。 1）废热回收单元的意外失效（WHRU）：该装置在六个月内过早发生。由于硫酸，故障的根本原因是管鞘焊接在管鞘焊接接头处的腐蚀性攻击。进入热交换器（HE）的气体为〜873‰，气体退出为〜350‰。众所周知，他的工作温度应在硫酸的露点（〜300μ）之外。 2）HRSG LP碳钢节能器引起的意外故障，由于SCC为三年。硝酸铵盐在翅片管中的OD上是可能的侵略性物种。这是一种引起碳钢管SCC的已知环境。

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