A study of composition of kraft recovery boiler carryover particles using an Entrained Flow Reactor

grantor: University of TorontoCarryover (unburned black liquor, char or smelt particles entrained in the flue gas during black liquor combustion) adheres to the heat transfer tube surfaces and forms deposits in kraft recovery boilers. Carryover deposition depends greatly on its liquid content, which, in turn, is a function of composition. Understanding the carryover composition and the parameters affecting the composition is important for optimizing recovery boiler performance. This work examined the effects of black liquor particle size, gas oxygen concentration, and the chloride and sulfur contents of black liquor on carryover composition. Carryover particles were produced using an Entrained Flow Reactor. The results show that the char, chloride, potassium and sulfide contents of carryover increased while the sulfate content decreased with an increase in black liquor particle size, and with a decrease in gas oxygen concentration. Chloride and potassium contents in carryover particles were less than those in the black liquor.M.A.Sc