Abstract: To study the performance of the combustion system fueled with different proportions of coal slurry mixture, three operating conditions, without peat blending, with peat blending at 25% main pump speed and with peat blending at 40% main pump speed, are tested on a 520-t/h circulating fluidized bed(CFB) boiler in one Power Plant. The results show that with the increase of peat blending ratio, the average bed temperature is significantly reduced and much closer to the optimum desulfurization bed temperature; the distribution of the furnace temperature field is more uniform so that will benefit the furnace combustion and heat absorption; the overheating of the platen superheater wall and the low boiler main stream temperature are substantially improved.

Key words: circulating fluidized-bed boiler, coal slime blending, combustion characteristic