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Failure analysis of a fluidisation nozzle in biomass boiler and the long-term high temperatures oxidation behaviour of 304 stainless steel

机译:生物质锅炉流化喷嘴的失效分析及304不锈钢的长期高温氧化行为

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摘要

The long-term (> 10 years) oxidation behaviour of stainless steels (SS) at high temperatures was previously unknown. The behaviour was studied through a case study of failure analysis. A fluidisation nozzle made of 304 austenitic SS. After over 100,000 h of service at temperatures of 790-820 degrees C in a biomass boiler, the nozzle fractured. Failure analysis pinpoints that the nozzle wall temperature fluctuation caused the oxide scale cracking, which intensified the oxidation. The brittle fracture was due to fully oxidization.
机译:以前尚不清楚高温下不锈钢(SS)的长期(> 10年)氧化行为。通过故障分析的案例研究行为。由304奥氏体不锈钢制成的流化喷嘴。在生物质锅炉中在790-820摄氏度的温度下运行100,000多小时后,喷嘴破裂。失效分析指出,喷嘴壁温度的波动会导致氧化皮开裂,从而加剧氧化。脆性断裂是由于完全氧化所致。

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