Rresidual life prediction of service exposed main steam pipe of boilers in a thermal power plant

A.K.Ray; Y.N.Tiwari

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Rresidual life prediction of service exposed main steam pipe of boilers in a thermal power plant

机译：火电厂锅炉服务暴露主蒸汽管剩余寿命预测

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This paper deals with residual life predicationmethodology for more than 12.5 years service exposed mainsteam pipes of various boilers in a thermal power plant. Healthassessment was made using destructive accelerated stressrupture and tensile tests at different temperatures, and somenondestructive tests. There was no evidence of localised damagein the form of surface cracks, cavitation or dents in the serviceexposed main steam pipes of all the boilers. So far as theremaining life at 550 deg C is concerned, it is possible to obtaina life of greater than 100,000 h at the hoop stress level of theservice exposed pipes, provided no localised damage in the formof cracks or dents have been developed. It is recommended thata health check may be carried out after 50,000 h of serviceexposure at 550 deg C.

机译：本文探讨了火力发电厂中各种锅炉暴露于主蒸汽管道超过12.5年的剩余寿命预测方法。使用在不同温度下的破坏性加速应力破坏和拉伸测试以及一些非破坏性测试进行健康评估。没有证据表明所有锅炉在使用中的主蒸汽管中都出现表面裂纹，气穴或凹痕的局部损坏。就目前在550摄氏度的使用寿命而言，如果未发现裂纹或凹痕形式的局部损坏，则在暴露在外的管道的环向应力水平下，可以获得超过100,000小时的寿命。建议在550°C进行50,000小时的使用后应进行健康检查。

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《Engineering failure analysis》 |2000年第5期|共18页
作者
A.K.Ray; Y.N.Tiwari;
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正文语种 eng
中图分类工程力学;
关键词
service exposed; boiler failures; stress rupture test; tensile properties; remaining life;

机译：暴露的服务;锅炉故障;应力破裂测试;拉伸性能;使用寿命;

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1. Rresidual life prediction of service exposed main steam pipe of boilers in a thermal power plant [J] . A.K.Ray, Y.N.Tiwari Engineering failure analysis . 2000,第5期

机译：火电厂锅炉服务暴露主蒸汽管剩余寿命预测
2. Life Prediction of Service Exposed Tubes in a Boiler of a Thermal Power Plant [J] . A. K. Ray, Y. N. Tiwari, P. K. Roy, Journal of the Mechanical Behavior of Materials . 2003,第2a3期

机译：火力发电厂锅炉使用寿命暴露管的寿命预测
3. Residual life estimation of service exposed reheater tubes in a boiler of a thermal power plant [J] . A. K. Ray, Y. N. Tiwari, J. K. Sahu, Journal of the Mechanical Behavior of Materials . 2002,第2期

机译：火力发电厂锅炉中暴露在外的再热器管的剩余寿命估计
4. SVR based prediction modeling for carbon content of pulverized coal in primary air pipe of thermal power plant boiler [C] . Qiyue Xie, Huilin Fu, Xiaoli Wang, Chinese Control Conference . 2016

机译：基于SVR的火电厂锅炉一次风管煤粉含碳量预测模型
5. Study of the long-term service degradation of boiler superheater tubes and its effects on remaining life predictions [D] . Alobaidi, Khalid Ayedh 2013

机译：锅炉过热器管的长期使用退化及其对剩余寿命预测的影响研究
6. Intelligent Steam Power Plant Boiler Waterwall Tube Leakage Detection via Machine Learning-Based Optimal Sensor Selection [O] . Salman Khalid, Woocheol Lim, Heung Soo Kim, 2020

机译：智能蒸汽发电厂锅炉水墙管漏电检测通过机器学习的最优传感器选择
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

Rresidual life prediction of service exposed main steam pipe of boilers in a thermal power plant

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