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The ultra-supercritical double-reheat power generation technology has become an important development direction of thermal power generation technology due to its high efficiency and low emissions. A dynamic simulation model of the double-reheat boiler was established by the GSE software based on a 660 MW ultra-supercritical double-reheat coal-fired boiler with triple-rear passes. The variation laws of the main, primary, and secondary reheat steam parameters after disturbance by coal flow rate, feed-water flow rate, feed-water temperature and excess air coefficient under 100%THA working condition were calculated in detail. Moreover, the variation laws of steam temperature at the boiler outlet under the working conditions of 100%THA, 75%THA and 50%THA were compared. The simulation results show that the response of steam parameters at the boiler outlet is the slowest after feed-water temperature is disturbed, and the stability time is approximately 2 300 s under 100%THA working condition. The response of steam parameters at the boiler outlet is the fastest after excess air coefficient is disturbed, and the stability time is approximately 720 s. The stability times of the steam parameters at the boiler outlet are approximately 1 040 s and 1 250 s respectively after coal flow rate and feed-water flow rate are disturbed. In the initial stages of transient processes after coal flow rate, excess air coefficient and feed-water temperature are disturbed, there are short-term “reverse” changes in the steam temperature at the boiler outlet. In addition, the thermal inertia of the double-reheat boiler will increase as the boiler load decreases. The simulated dynamic characteristics of the double-reheat coal-fired boiler with triple-rear passes can provide the basis for further optimization of the unit operation control strategies.
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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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