PDF
Full
Outline
In order to study the dynamic characteristics of supercritical once-through boiler units and design a coordinated control algorithm for it, a supercritical 600 MW coal-fired once-through boiler unit is taken as the research object and a mechanism model of the unit is established. In the model, the complex heat absorption equation and steam pressure difference equation in boiler section, as well as the superheated steam flow equation and unit load coefficient equation in turbine section are fitted by the long short-term memory (LSTM) neural network with real operational data from the unit given the algorithm's superiority in handling sequence data with long-term dependencies. This established four sub-models of the equations that can capture the operating characteristics of the unit. For the dynamic parameters in the mechanism model, an improved differential evolution algorithm is proposed to identify. After this, a complete state equation model is obtained. The established model is verified through open-loop step disturbance testing and closed-loop simulation upon historical operation data. The results show that the established model can accurately reflect the dynamic operating characteristics of the unit. The mean absolute percent error of the main steam pressure, steam enthalpy in separator and unit load are all less than 1.76%, which means the established model has high accuracy and can be used for research on coordinated control algorithms of supercritical units.
PDF
125
58
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
