Research on Combustion Stability of a 600 MW Subcritical Power Unit Under Long-Term Deep Peak Shaving

Abstract

Deep peak shaving of thermal power units is a crucial technique for integrating new energy sources and altering energy consumption patterns. A 600 MW sub-critical coal-fired unit was chosen as the subject of research, and long-term operation tests were conducted at 15% and 20% rated load respectively. The impact of different parameters on fire detection fluctuation was analyzed through parameter analysis. Additionally, a sliding window-based method for analyzing drum water level and furnace negative pressure wave characteristics was proposed for determining furnace combustion stability. The results of the tests indicate that with plasma combustion stabilization and a calorific value of approximately 20 kJ/g for Junger coal, two sets of coal mills can maintain long-term combustion stability at 15%-20% rated load for a 24-hour period. Furthermore, the analysis reveals that the coal volume change rate, coal volume distribution, and primary air volume are the primary factors influencing fire detection fluctuation. Overall, this study has provided valuable insights for implementing long-term, deep peak regulation of similar units. The research results can provide a reference for long-time limit depth peak regulation of the same type of units.

Keywords

• thermal power units
• deep peak shaving
• flame detector fluctuation
• combustion stability
• correlation analysis