Open AccessExperimental Study on Low-load Sliding Pressure Operation of Supercritical Unit
Author(s) -
Wei Zheng,
Panfeng Shang,
Junke Guo,
Yue Han,
Lingkai Zhu,
Jinxu Lao,
Li Li,
Junjun Ding,
Yue Ma
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/677/5/052019
Subject(s) - bandwidth throttling , cylinder , supercritical fluid , unit load , work (physics) , materials science , pressure control , control theory (sociology) , pressure regulator , mechanics , mechanical engineering , engineering , computer science , thermodynamics , physics , control (management) , artificial intelligence , gas compressor
This work reports the variation of the heat rate (HRT) and the efficiency of the high-pressure cylinder by the test of the operation mode of different control valves of the first home-made supercritical 660MW unit. The heat consumption rate and high pressure cylinder efficiency of sequential valve operation are better than that of single valve operation, especially heat consumption rate and high pressure cylinder efficiency are quite different under low-load condition of 400MW and 500MW. Above 600MW, the economic indexes of sequential valve operation and single-valve operation with three-valve are similar, of which the heat rate and the efficiency of high-pressure cylinder are better than that of single-valve operation with four-valve. When the unit adopts the sliding pressure operation mode at the load ranging from 360MW to 550 MW, the optimal sliding pressure operating curve is different from the designed curve. According to the analysis of the experimental sliding pressure operating curve and the sliding pressure operation characteristics of the unit, the higher main steam pressure can be used to increase the throttling of the governing valve when the operating conditions close to the sliding pressure curve, which can quickly increase the load and enhance the variable load response ability and peak regulation capacity of the unit.