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The dynamic characteristics of the bottoming cycle of a gas turbine combined cycle have a significant influence on the load variation characteristics of the unit. Partially recuperation is a new method which can be used to improve the performance of combined cycle at partial load, it is an important part of system feasibility evaluation to study the effect of partially recuperation on the dynamic characteristics of the bottoming cycle. In this paper, a dynamic simulation model of the bottoming cycle system of a partially recuperative combined cycle unit is established by using modular modeling method, and the dynamic characteristics of inlet parameter disturbance and load shedding process are studied. The results show that, the dynamic model can accurately reflect the dynamic characteristics of the bottoming cycle, and the simulation results show that the dynamic response of partially recuperative units facing the disturbance of exhaust parameters is consistent with that of conventional units. The disturbance of exhaust temperature T4 mainly affects the high-pressure superheated steam and reheated steam, and the influence range is larger. The disturbance of T4 with 5% can reduce the bottoming cycle power by 16.32%. The response speed of the unit is slower, and the time constant of the steam turbine power is about 400. The disturbance of exhaust flow affects the steam of each stage, and the influence range is relatively small, the disturbance of 10% reduces the bottoming cycle power by 9.49%, the response speed of the unit is faster, the time constant of the steam turbine power is about 60. When the recuperative ratio is disturbed, the dynamic response of the unit is similar to that of the T4 disturbance, and the operation strategy of recuperative regulation results in the load variation of the combined cycle being borne entirely by the bottoming cycle, the time needed for partially recuperative units to reach steady state is 1 100 s later than that of conventional units, and the recuperative regulation mode is suitable for use in the load interval below 51.4%.
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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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