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At present, domestic research on gas control valves or other equipment in gas turbines is still lacking, while most of these researches’ models remain in a single hydraulic valve or a hydraulic cylinder. So this paper uses Simulink/Simscape software to model the entire gas turbine’s gas control valve including the PI controller to the gas pipeline, and conduct simulation analysis for faults such as fixed orifice blockage, wear of the spool valve core and hydraulic oil contamination to discuss their forms and causes. The result shows that, the blockage of the one-sided fixed orifice of the nozzle damper valve, the wear of the slide valve core and the impurities in the hydraulic oil will all cause the valve to respond slowly, or even become clogged and stuck to varying degrees. Finally, for the monitoring of valve data in current power plants some suggestions are thrown out: according to the actual operating conditions, monitoring of the parameters such as the servo valve spool displacement signal and hydraulic cylinder piston displacement can be introduced by using electronic feedback servo valve, to better judge the health status of the valve.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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