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With the growth of installed capacity of renewable energy power generation, coal-fired units need to undertake more peaking tasks. In order to improve the operational flexibility of coal-fired units, a 1 000 MW unit is taken as the research object, and six heat storage configurations and four heat release configurations of molten salt coupling are proposed based on the Ebsilon software, and the thermo-economic indexes of different heat storage and heat release coupling configurations are analyzed comparatively. The results show that, the peak shifting capacity of the system in the heat storage stage is positively correlated with the pressure loss of the heat transfer steam, and the thermal economy of heating the deaerator outlet feedwater in the heat release stage is the best. The heat storage of the electrically heated molten salt has the highest thermal and exergy efficiency, and configuration D-a has the strongest peak shifting capacity, with a peak shifting depth of up to 23.61%, but it has the largest coal consumption rate and exergy loss. Configuration F-d has the best thermal economy, with peak shifting depth, thermal efficiency, fuel efficiency and coal consumption rate of 23.42%, 39.61%, 38.40% and 310.2 g/(kW·h), respectively.
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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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