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The high-temperature and high-pressure steam control valves in steam-heated molten salt thermal energy storage systems have to withstand high temperature, high pressure, and high pressure difference, and require frequent and high-precision adjustments. In view of these design and manufacturing challenges, a steam-heated molten salt thermal energy storage demonstration project was taken as the research object. Focusing on the actual application requirements of high-temperature and high-pressure steam control valves, systematic calculation and analysis were conducted on their flow capacity under different selection working conditions. An innovative technical scheme was proposed, which involves designing different stages of throttling and pressure reduction for different opening ranges of the control valve. This scheme effectively achieves good adaptability of the valve under full working conditions. It can accurately match the regulation requirements of the system in different operation stages, and significantly improves the adjustment accuracy. When the upstream steam flow rate is low, the use of steam-assisted atomizing nozzles is recommended, as they can make the atomized water particles finer, achieve a better atomization effect, reduce thermal shock and thermal stress on the pipeline, and ensure the safety of the device after desuperheating. This study sorts out the key considerations in the selection process of high-temperature and high-pressure steam control valves, which can provide important reference for the selection and design of high-temperature and high-pressure steam control valves in subsequent similar steam-heated molten salt heat storage projects.
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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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