Abstract:
The igniting behaviors of the mixed fuels of petroleum coke and oil shale were tested. The mixed fuel No.2 (mass ratio of oil shale to petroleum coke is 3∶7) was ignited by an oil gun under the circulating fluidized bed (CFB). Under cold conditions, a small amount of fuel particles are ignited and burned when the bottom temperature rises to about 420 ℃. After the bed temperature reaches 650 ℃, the oil injection is gradually reduced, and the test fuel can be easily ignited and steadily burned. The study shows that the igniting behavior of the mixture of oil shale and petroleum coke at a ratio of 3∶7 can fully satisfy the operating requirements of CFB boilers. The content of volatile compontents is the key factor affecting the igniting temperature. Except for the mixed fuel No.1, the volatile components of other 4 mixed fuels are more than that of the designed fuel for MPCC′s CFB boilers. The mixed fuel No. 2 shows better igniting behavior than the design fuel for the CFB boilers.