Exergy analysis of a 1000 MW double reheat ultra-supercritical power plant
| Autor: | Gang Chen, Pengshuai Han, Jun Xiang, Long Jiang, Yingbiao Zhou, Song Hu, Xu Jun, Yi Wang, Sheng Su, Zhijun Sun, Cui Xiaoning, Ningning Si, Zhao Zhigang |
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| Rok vydání: | 2017 |
| Předmět: |
Exergy
Waste management Power station Renewable Energy Sustainability and the Environment 020209 energy Boiler feedwater Boiler (power generation) food and beverages Energy Engineering and Power Technology 02 engineering and technology Combustion complex mixtures Fuel Technology Heating system 020401 chemical engineering Nuclear Energy and Engineering Heat exchanger 0202 electrical engineering electronic engineering information engineering Exergy efficiency Environmental science 0204 chemical engineering |
| Zdroj: | Energy Conversion and Management. 147:155-165 |
| ISSN: | 0196-8904 |
| DOI: | 10.1016/j.enconman.2017.05.045 |
| Popis: | This study evaluates the performance of a 1000 MW double reheat ultra-supercritical power plant. An exergy analysis was performed to direct the energy loss distribution of this system. Based on the exergy balance equation, together with exergy efficiency, exergy loss coefficient, and exergy loss rate, the exergy distribution and efficiency of the unit were determined. Results show that the highest exergy loss in furnace is as high as 85%, which caused by the combustion of fuel and heat exchange of water wall. The VHP and the two LPs suffer the highest exergy losses, namely 1.86%, 2.04% and 2.13% respectively. The regenerative heating system has an exergy loss rate of 2.3%. The condenser suffers a heat loss of 999 MW, but its exergy is as low as 20.49 MW. The sensitivity variations of the unit’s exergy efficiency with load, feedwater temperature, main steam temperature and pressure, the twice reheat steam temperatures, and steam exhaust pressure were also analyzed, indicating that load, feedwater temperature, and steam exhaust pressure influence the exergy efficiency of this unit than other elements. The overall exergy efficiency decreases along with the gradual increase of steam exhaust pressure at any constant outlet boiler temperature, but it increases as the load, feedwater temperature, main steam temperature and pressure, and twice reheat steam temperatures increase at fixed steam exhaust pressure. |
| Databáze: | OpenAIRE |
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