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在汽轮机调峰运行方式试验研究中、由于启动或负荷大幅度波动,都将在汽缸壳体等部件上产生较大的效应力,经过热应力计算和高温下应变电测,得知应力水平不仅随机变化,而且有超过材料屈服应力的应力峰值。这些屈服后应力峰值的有效确定,显然直接关系到机组安全运行与寿命的正确评估,本文就调峰机组汽缸壳体应力测试结果,根据工程塑性理论,进行了分析处理,讨论了导致汽缸翘曲变形和热疲劳损伤的力学因素,为制定机组调峰运行控制指标,提供了力学试验依据。
In the research of turbine peaking operation mode, due to start-up or large load fluctuation, a large effective stress will be produced on components such as the cylinder shell. After calculation of thermal stress and electric strain measurement under high temperature, it is known that the stress level Not only random changes, but also have stress peaks exceeding the yield stress of the material. The effective determination of peak stress after yielding is directly related to the correct assessment of the safe operation and life of the generating unit. In this paper, the stress test results of the cylinder shell of the peaking unit are analyzed and treated according to the engineering plasticity theory. Deformation and thermal fatigue damage of the mechanical factors, in order to develop control of peak load operation indicators, provides a basis for mechanical testing.