Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4992140 | Applied Thermal Engineering | 2017 | 35 Pages |
Abstract
A 660 MW supercritical coal-fired power plant coupled with a steam ejector is proposed to increase the feedwater temperature, which is used to ensure the NOx reduction ability under a low load. The simulation work for the system performance under different steam sources of feedwater heater, feedwater regenerative heating systems and steam sources of steam ejector is carried out. Results indicate that it's a favorable choice to increase the water temperature through adding No. 0 feedwater heater coupled with steam ejector, because NOx removal efficiency increases from 68.97% (benchmark condition) to 74.66% under 50% THA condition, and it would improve the plant thermal efficiency while the standard coal consumption rate would decrease 0.5 g (kW h)â1. Meanwhile, results conclude that it has superior performance than the system by No. 1 feedwater heater coupled with steam ejector. Finally, it's found that it is more suitable when the primary flow is from the platen superheater outlet. It also finds that the system performance (the induced flow is from No. 1 steam extraction) is more efficient compared with systems that the induced flow is from the cold or hot reheat steam.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Weixiong Chen, Guozhu Zhang, Bingxin Li, Ming Liu, Jiping Liu,