POLLUTANTS EMISSION DURING CO-COMBUSTION OF PETROCHEMICAL SLUDGE WITH COAL IN CIRCULATING FLUIDIZED BED INCINERATOR
Co-combustion of petrochemical sludge with coal on circulating fluidized bed incinerator possesses a series of advantages, such as stable combustion, high efficiency, low emission of pollutants and so on. The experiments were conducted on a pilot-scale CFB with the dense bed cross section of 0.23m×0.23m and the height of 7m. The influences of the secondary air fraction, excess air coefficient and Ca/S molar ratio on the emission characteristics of pollutants during co-combustion were studied. The results indicate that SO2 emission increases but NOx and PAHs emissions decrease with increase in the secondary air fraction. As excess air coefficient augments, SO2 emission declines slightly while the NOx concentration and desulphurization efficiency rise substantially, and PAHs emission decreases at first and then increases. SO2 and HCl emissions decline and desulphurization efficiency increases with increase in Ca/S molar ratio. The effect of calcium oxide is superior to that of limestone. HCl emission increases with the higher sludge feeding rate. Furthermore, those PAHs emitted are mainly dominated by lower molecular weight (LMW) PAHs, such as two-, three- ringed PAH. The amount of PAHs in the bottom ash is much less than that in the fly ash. The experimental results provide solid basis for the design of co-fired CFB incinerator and the control of pollutants emission for incinerating petrochemical sludge.
petrochemical sludge circulating fluidized bed (CFB) co-combustion pollutants emission polycyclic aromatic hydrocarbons (PAHs)
Ge ZHU Changsui ZHAO Yongwang LI Duanfeng LU Xiaoping CHEN Yufeng DUAN
Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education, Southeast University, Nanjing, China
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
465-470
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）