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首页> 外文期刊>Engineering failure analysis >Failure analysis and retrofitting of superheater tubes in utility boiler
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Failure analysis and retrofitting of superheater tubes in utility boiler

机译：电站锅炉过热器管的故障分析与改造

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The extreme spray water mass flow rate deviation was observed to occur in the middle temperature superheater of Sahand 2 x 325 MW Power Plant utility boiler, which severely affected its economic performance and safe operation. Boilers operating in these conditions led to failure in superheater tubes at the same place for two consecutive times in a three year span. Thus, the failure analysis of superheater tubes by investigating the visual inspection, chemical, scale and creep analysis was carried out. The brittle failure occurred in the superheater tubes after the fuel was changed from natural gas to heavy oil. Failure analysis showed that tubes were suffering from long term overheating which was instigated by high spray water flow rate. In order to rectify the boiler operating conditions, some modifications were applied in the boiler unit 1 and operating parameters on this boiler were compared with boiler unit 2. The results showed that the 8.33% reduction in heating surface area corresponds to 52.84 and 17.80% reduction in spray water mass flow rate for capacities equal to 300 and 260 MW, respectively. (C) 2015 Elsevier Ltd. All rights reserved.
机译：萨汉德2 x 325 MW电站电站锅炉中温过热器中出现了极端的喷水质量流量偏差，严重影响了其经济性能和安全运行。在这种条件下运行的锅炉在三年的时间内连续两次导致同一位置的过热器管发生故障。因此，通过对外观检查，化学，水垢和蠕变分析的研究，对过热器管进行了故障分析。将燃料从天然气换成重油后，过热器管发生脆性故障。失效分析表明，由于喷淋水流速高，导致管子长期过热。为了纠正锅炉的运行条件，对锅炉单元1进行了一些修改，并将该锅炉的运行参数与锅炉单元2进行了比较。结果表明，加热表面积减少了8.33％，对应的减少了52.84％和17.80％容量分别等于300和260 MW的喷雾水质量流量。 （C）2015 Elsevier Ltd.保留所有权利。

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