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Sun S.,Huadian Electrical Power Research Institute | Sun S.,Hangzhou Huadian Energy Engineering Co. | Tian X.,Huadian Electrical Power Research Institute | Tian X.,Hangzhou Huadian Energy Engineering Co. | And 6 more authors.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2016

To solve the problem of too high inlet flue gas temperature existing in the denitrification system of tower once-through boilers, a high-temperature flue gas heat exchanger was designed to reduce the inlet temperature down to the optimum operation range of relevant catalysts, while the heat in flue gas was recycled. A retrofit scheme was proposed for the flue gas heat exchanger system, and its operation effect was evaluated. Results show that the method proposed has helped to solve the problem of too high inlet flue gas temperature of the SCR denitrification system; at rated load, the denitrification efficiency can be increased by 1.4%; in the case of load fluctuation, the heat exchanger may help to stabilize the inlet temperature of SCR denitrification system; with the application of high-temperature flue gas heat exchanger, both the exhaust flue gas temperature and the outlet air temperature of boiler can be reduced. © 2016, Shanghai Power Equipment Research Institute. All right reserved.

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