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Aiming to the performance analysis of boiler with supercritical carbon dioxide (S-CO2) cycle, the boiler performance evaluation index system is built by taking the gas-fired boiler used in the 5 MW S-CO2 Brayton cycle pilot unit at Xi'an Thermal Power Research Institute Co., Ltd. as the research object. The core performance indexes of S-CO2 boiler include the fuel efficiency of boiler, the ratio of heat absorption over the input heat for each heat exchanger, the performance of air preheater, the pressure drop of working fluid system, the NOx emission concentration, and others. The fuel consumption and excess air coefficient are calculated via the measurement of oxygen concentration. Meanwhile, the calculation method of heat loss due to exhaust gas is improved. The ratio of heat absorption over the input heat for each heat exchanger is introduced, which shows the contribution of each heat exchanger on heat absorption process. Finally, the calculation process is integrated becoming to an executable program, and it is applied in the running and monitoring procedures. An operating case showed that, for the research object, the actual condition is basically the same as that of the design parameters. The finally calculated boiler fuel efficiency is 92.05% without correction and 93.79% with correction, the later is similar as the designed value (93.53%).
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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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