| Autor: |
Liu, Guofu, Cui, Yidong, Ji, Jiaqing, Shen, Dekui, Wang, Qi, Li, Chao, Luo, Kai Hong |
| Předmět: |
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| Zdroj: |
Journal of the Energy Institute (Elsevier Science); Dec2019, Vol. 92 Issue 6, p1757-1764, 8p |
| Abstrakt: |
A technical method for diagnosing the distribution of NO x flux within the cross-section area in front of ammonia injection grid (AIG) was proposed for guiding the valve-tuning of AIG branch-pipes, in order to optimize the NO x /NH 3 mixing ratio in the selective catalytic reduction (SCR) system of power plant. The weight coefficient of each branch-pipe in AIG system can be quantitatively determined with regard to the distribution of NO x flux in the corresponding sub-zone of the cross-section area. The control strategy of the valves for different AIG branch-pipes can be achieved for guiding the NH 3 injection and improving the NO x /NH 3 mixing ratio within the whole cross-section area in front of AIG. The technology has been applied on one side of the SCR system flue-gas tunnels (normally two tunnels for the SCR system called as A-side and B-side) of a 660 MW plant for more than one year. The ammonia consumption rate of the SCR system was reduced about 12.62% and the uniformity of outlet NO x distribution was estimated to be greatly improved by about 79.01% with regard to the standard deviation. The rising rate of the flue gas resistance of the air preheater was slown down by 39.18% compared to that of the other flue-gas tunnel of SCR system. This implied that the formation of the sticky ammonium bisulfate (ABS) on air preheater was significantly inhibited through the application of this technology. Image 1 • NH 3 injection strategy of AIG area was obtained via analysis of NO x flux distribution. • Ammonia consumption rate and smoke-flow resistance rising rate was limited. • The uniformity of outlet NO x distribution was greatly improved. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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