Energy-Saving Analysis of 215MW Cogeneration Boiler Adding Low Temperature Economizer

Abstract:

A 215MW cogeneration B&W670/13.7-M type high-pressure natural circulation boilers, the exhaust gas temperature is set as 143 °C, while in the actual operation, the average exhaust gas temperature is 155 °C, and when the unit is running at full capacity in summer the highest exhaust gas temperature is 169.6 °C. In order to satisfy the normal operating temperature of bag filter in summer peak load, and recover low temperature waste heat of fule gas, low temperature economizer is added to the thermal system. Therefore, low-temperature economizers are respectively added in four flues which are between the outlet of the air preheater and the entrance of the bag filter, this will achieve the purpose of reducing flue gas temperature by transferring heat between condensate and flue gas, ensuring the units safe operating and improving the overall operating performance of the boiler.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 2777-2780
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.2777
• Online since: October 2013
• Authors: Yan Feng Liu, Shi Ping Li, Xiang Hong Li
• Keywords: Analysis, Energy Saving, Low Temperature Economizer

References

[1] H.J. Zhang, Y. Wang, S.F. Tian, Economic Analysis of Low Pressure Economizer System Based On The Equivalent Enthalpy Drop Method, Energy Conservation Technology, 9(2011), 57-461.

[2] Z.H. Ge, M.S. He, Variable Condition Calculation Of Cogeneration Units Based on Equivalent Enthalpy Drop Method, Energy Conservation Technology. 1(2012), 62-65.

[3] X.N. Kang, W.J. Ma, T. Ma, Economic Study On Adding Low-temperature Economizer on A 320 MW Unit, Thermal Power Generation. 4(2012), 8-11.