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- Title
1755MW核电汽轮机轴向位移跳机阈值调整与验证.
- Authors
郑军伟; 汪彦; 刘航; 田洪波
- Abstract
There is a need to prevent a pressurized water reactor nuclear power plant from turbine trip and reactor trip problems caused by the axial displacement of the turbine exceeding the trip threshold during the transient test of rated load(100% full power,100% FP) platform.The axial thrust balance design scheme of HN1755-7.55/291/275.8 type steam turbine was analyzed,and it was found that the axial thrust of the medium pressure cylinder was greater than the axial thrust of the high pressure cylinder when the load rejection occurred.The calculation equations for the maximum axial displacement and the load during the load rejection process were obtained according to the relationship between the load and the steam demand under the throttling governing of the steam turbine at a ratio of 1∶1,and the experiential calculation coefficient was provided in this paper.The maximum axial displacement during the transient test of 100% FP platform was calculated based on the test results of 54.7% FP trip of Unit 1,and was greater than the positive-going trip threshold of turbine axial displacement,indicating too small turbine trip threshold.Then the positive-going trip threshold of turbine axial displacement was adjusted from 0.50 mm to 0.80 mm after the joint analysis between commissioning department and design department according to the data of turbine installation and operation.The maximum axial displacement of turbine during the 100%FP platform transient tests was between 0.61 mm to 0.67 mm for Unit 1,and between 0.48 mm to 0.58 mm for Unit 2.The problems of turbine trip and reactor trip during the 100%FP platform transient tests in Unit 1 and Unit 2 were successfully avoided by adjusting the positive-going trip threshold of turbine axial displacement.
- Publication
Journal of Engineering for Thermal Energy & Power / Reneng Dongli Gongcheng, 2020, Vol 35, Issue 5, p59
- ISSN
1001-2060
- Publication type
Article
- DOI
10.16146/j.cnki.rndlgc.2020.05.008