著者

Xun CHEN Xue-nong DUAN Li-min WANG Yi-ping CHEN Dun-dun WANG

出版者

The Japan Society of Mechanical Engineers

雑誌

Proceedings of the International Conference on Power Engineering : ICOPE (ISSN:24242942)

巻号頁・発行日

pp._ICOPE-15--_ICOPE-15-, 2015-11-30 (Released:2017-06-19)

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Under the circumstances of different inlet air heating modes for thermal units with rotary air preheaters using flue gas denitrification, in order to perform the comparison and analysis on the outlet gas and air temperatures, the wall temperature of the heat storage element, and the influencing trend and variation patterns of acid corrosion area and ammonium bisulfate deposition area, the thermodynamic properties of the air pre-heater are calculated. Based on the thermodynamic model, the calculation are done on the air pre-heater of a 600MW power plant, with hot air recirculation mode and inlet air heating mode respectively. The results show that in the hot air recirculation mode, with the hot air recirculation ratio increasing, the average outlet wall temperature of the cold-section goes up, while that of the hot-section goes down. Meanwhile, with the acid corrosion area in the cold-section shrinking, the ammonium bisulfate deposition area ascends, which intensifies ash clogging in the air pre-heater. In the steam air heating mode, the average outlet wall temperature of the heat storage elements at both the hot and cold section increase, and the acid corrosion and ammonium bisulfate buildup areas descend simultaneously. Thus, for the air heater of thermal power units using flue gas denitrification technology and high-sulphur coal, the calculations for thermal check should be conducted for winter peak load scenarios, and the inlet air heating by steam air heater is more preferable to be applied in practice.