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An Analysis of Problems Arising during Operation of the Perm District Power Plant 800-MW Power Unit at Sliding Pressure

机译：彼尔姆地区电厂800 MW机组滑压运行过程中出现的问题分析

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摘要

The occurrence of cracks at locations in which bottoms are welded to the high-pressure heaters' headers was revealed during planned repairs of the Perm district power plant units. Specialists of the All- Russia Thermal Engineering Institute carried out investigations aimed at obtaining more detailed data on the effect the loading cyclicity and sliding-pressure operating modes have on the reliability of power-generating equipment. Another aim of those investigations was to elaborate recommendations for achieving more reliable operation of power-generating equipment under the conditions of cyclic variation of its load. The state of the main and auxiliary equipment of the Perm district power plant units is analyzed for determining the possibility and advisability of their further operation in sliding-pressure modes. The results obtained from calculating the permissible number of load variation cycles for the headers used in the Perm district power plant units operating under the conditions of startup-shutdown modes are analyzed, and the headers' residual cyclic service life is estimated. The results obtained from a metallographic investigation of the high-pressure header's bottom in the welded joint of which a through crack was revealed are presented. Recommendations for examining the header bottoms and for modifying their design in order to improve their operational reliability are given.
机译：在计划对彼尔姆地区发电厂的机组进行维修时，发现底部焊接到高压加热器集管的位置出现了裂纹。全俄罗斯热工研究所的专家进行了调查，目的是获得更详细的数据，以了解负载循环和滑动压力运行模式对发电设备可靠性的影响。这些研究的另一个目的是为在负荷的周期性变化条件下实现发电设备的更可靠运行制定详细的建议。分析彼尔姆地区发电厂的主要和辅助设备的状态，以确定在滑压模式下进一步运行的可能性和可取性。分析通过计算在启动-关闭模式条件下运行的彼尔姆区发电厂机组使用的联管箱的负载变化循环的允许次数而得出的结果，并估算联管箱的剩余循环使用寿命。呈现了从高压集管底部的焊接接头的金相研究中获得的结果，该接头的通透缝隙被发现是贯通的。给出了检查集管箱底部和修改其设计以提高其操作可靠性的建议。

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