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The hightemperature molten salt electric heater is the core equipment for achieving electric heating conversion in the heat storage system, and mastering the internal temperature distribution characteristics is the key to promoting its structural optimization. A calculation model for traditional molten salt electrical resistance heater was established, and CFD software was used to study the temperature distribution characteristics inside the heater by solving the three – dimensional N−S equation and energy equation. The variation patterns of the temperature distribution inside the electric heater under different working conditions were obtained. The results show that the temperature difference between the molten salt and the tube wall gradually increases along the flow direction, while multiple series arrangements can effectively reduce the heat transfer temperature difference. The temperature difference between the two at the heater connection can be reduced from 27 °C to 2°C; At the same time, due to the inconsistent density of the internal heating tubes, the temperature of the molten salt, resistance wire, and filling material in the center of the crosssection is significantly higher than that at the edge, and with the increase of load, the temperature gradient gradually increases. When the average heat flux density increases from 5.71 W/cm² to 28.57 W/cm², the temperature difference of the molten salt in the crosssection increases from 49 °C to 68 °C. It can be seen that reasonable distribution of the electric heating tube layout is the key to reducing the temperature difference in the crosssection and reducing thermal stress.
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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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