Comparative Analysis of Combustion Characteristics of a CFB Boiler during the Changes Process between High-Rated Loads and Low-Rated Loads

In order to alleviate problems such as large fluctuations in grid load caused by the high proportion of renewable energy, circulating fluidized bed (CFB) power plants undertake task rated regulation. This study discussed combustion characteristics a 100 KW CFB boiler during operation process varying loads and analyzes characteristics, regulation rate emissions variation law high- low-rated intervals. The experimental results showed that under condition high-rated load, average temperature each area furnace was proportional size load. Under conditions, change increased first then decreased with reduction 30% stage, lowest riser 740 °C, while loop seal even low 650 °C. concentrations O2, CO unburned carbon mainly depended on reaction intensity condition, which higher trend at (30%). terms NOx emission, it range. However, generation about 30 mg/Nm3(@6%O2) than 50% addition, (2.5%/min) between high-load conditions exhibited significantly greater low-load (0.78%/min). Therefore, will face temperature, uneven gas–solid fluidization, difficult control pollutant generation, need be paid attention operation.