Experimental Studies Of Furfural Residue Combustion Characteristics In Fluidized Bed

At present our country has about500furfural plant, produce1ton of furfuralwill produce about13tons of furfural residue, production of furfural is severelyrestricted because of furfural residue processing. Furfural residue contains largeamounts of cellulose. If furfural residue is used to fuel, furfural plant will not onlysolve the furfural residue difficult issue, but also save energy coal investment, furfuralresidue will be the best fuel for furfural factory, and change waste into treasure in linewith our policy of low-carbon energy. As in recent years low-carbon andenergy-saving environmental protection requirements, furfural residue in thecirculating fluidized bed combustion is gradually valued.A series of tests were conducted to investigate furfural residue burnout andignition in a bench-scale fluidized bed. Main factors affecting burnout time of thesample such as: bed temperature, airflow rate, the feeding amount and mean particlesize were studied in the experiments. Tests results show that high bed temperature,high airflow rate are helpful to shorten the burnout time of furfural residue. Ashrinking-core model was taken to simulate the burnout behavior. The simulationshows the combustion at low temperature is controlled following kinetics control anddiffuse control while gradually approaches the diffuse control with temperature rising.From the fire caused damage to the bed thermal equilibrium defined the fire index,and based on bed temperature response curve obtained ignition characteristics ofindex.Experimental studies of furfural residue combustion adjustment in circulatingfluidized bed, furfural residue of combustion quality is reflected mainly through thewater content, gas composition and the fly ash carbon. Furfural residue moisturecontent greatly impact on the bed temperature, with the moisture content of furfuralresidue gradual increase, bed temperature decrease significantly. When furfuralresidue moisture content of9%, furfural residue fire easily in the furnace and the whole bed temperature high, dense phase zone temperature is difficult to control thateasy over-temperature to coke. When furfural residue moisture content of52%, thewhole bed temperature low is not conducive to fuel burnout. When furfural residuemoisture content of28%, bed temperature is appropriate and a large range of fueladjustment control that whole combustion steady. Operation should ensure under thepremise of a certain excess air coefficient, maximize increase the rate of secondary airto improve air penetration in the furnace with the combustion of the fuel mix, toimprove boiler combustion efficiency.