【摘要】 锅炉强度可靠性对提高锅炉质量和市场竞争力具有重要意义,所以在介绍实际工程中汽包强度可靠性计算的同时,提出了一些具有普遍适用的确定重要随机变量设计参数的计算方法,以及封头直段和汽包环向焊缝强度可靠度计算方法;采用分析和论证的方法,提出了整台锅炉及其各受压件强度的目标可靠度,以及增加受压元件名义厚度与设计厚度之差有利于提高和保证强度可靠度;给出的计算方法适用于各种用途锅炉汽包强度可靠性计算。研究结果是对既有研究的补充、完善和发展,同时对锅炉受压元件强度计算标准中"名义厚度不小于设计厚度"的数值关系提出了强度可靠性要求。更多还原

【Abstract】 Boiler strength reliability is of significant importance to improve the boiler quality and market competitiveness. In this paper,the calculation on the strength reliability of steam drum in practical engineering was introduced,and some universally applicable determination methods on the design parameters of important random variables were put forward,and followed by the strength reliability calculation methods on the head of the straight section and steam drum circumferential weld seam,and the determination of the target reliability of strength for the whole boiler and every pressure part. Increasing the difference between nominal thickness and design thickness is conducive to improve and ensure the strength reliability. The calculation methods of strength reliability presented in this paper are suitable for various boiler drums. This study is believed to extend the existing researches,and set a new requirement of strength reliability for boiler pressure parts,which are currently calculated through the numerical relationship of "nominal thickness is not less than design thickness"in the Chinese standard.更多还原