Thermodynamic analysis of a 660 MW ultra-supercritical CFB boiler unit
| Autor: | Yuxin Wu, Man Zhang, Yiqun Huang, Guangxi Yue, Xinyu Gao, Shahong Zhu, Fengjun Wang, Junfu Lyu, Hairui Yang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Thermal efficiency
Power station Pulverized coal-fired boiler business.industry 020209 energy Mechanical Engineering Boiler (power generation) 02 engineering and technology Building and Construction Pollution Industrial and Manufacturing Engineering General Energy 020401 chemical engineering Steam turbine Bottom ash 0202 electrical engineering electronic engineering information engineering Water cooling Environmental science Fluidized bed combustion 0204 chemical engineering Electrical and Electronic Engineering Process engineering business Civil and Structural Engineering |
| Zdroj: | Energy. 173:352-363 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2019.01.061 |
| Popis: | While the power plant units are the developing towards larger capacity, the relative shortage in thermal efficiency of the circulating fluidized bed (CFB) boiler unit, which has obtained significant development in recent years, is becoming more and more apparent. However, the thermal efficiency computational model applied for different CFB boiler units are not derived yet. Based on Generalized Energy Efficiency Distribution Matrix (GEEDM) model which is designed for normal pulverized coal boiler units, this paper innovatively built a computational model of cycle efficiency for CFB boiler units. Moreover, the mathematical influences of main local influencing factors like terminal difference, extraction steam pressure loss, heat loss, drained water cooling insufficient, steam desuperheater, shaft seal leakage of steam turbine and connection schemes of ash cooler to this model were further proposed to strengthen its industrial applications. In the meanwhile, the detailed thermodynamic analysis of a 660 MW ultra-supercritical unit in China was studied to provide some optimized design and operation suggestions. Particularly, for this unit, an optimized connection scheme of the ash cooler, a core component in the CFB boiler to reclaim physical heat in the bottom ash, was selected from 20 different connection schemes. |
| Databáze: | OpenAIRE |
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