Behavior and control of chlorine in dyestuff residue incineration.
Dyestuff residue, a type of hazardous waste, is incinerated in the tubular furnace, and thermodynamic equilibrium model is used to calculate and analyze the chlorine behavior. The HCl emission and its effects on the behaviors of heavy metals are studied. Meanwhile, the effects of three dechlorine reagents are predicted at a high temperature. Results show that HCl emission is dependent on incineration temperature. The HCl evaporated mainly derives from the organic chlorine. Under the working condition of 500-900 degrees C, the main products of Hg, Pb, Cu, Ni, Zn, and Mn in reaction with HCl are HgCl2 (g), PbCl4(g), PbCl2 (g), (CuCl)3 (g), NiCl2 (s), NiCl2 (g), ZnCl2 (s), ZnCl2 (g), Zn (g), MnCl2 (s), and MnCl2 (g), respectively. Among the three dechlorine reagents, CaCO3 is optimal to remove chlorine at high temperature, little of HCl is released below 800 degrees C, whereas Fe3O4 is unstable at high temperature.
Yan
Jian-Hua
JH
State key Laboratory of Clean Energy, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China.
Tan
Zhong-Xin
ZX
Jiang
Xue-Guang
XG
Chi
Yong
Y
Cen
Ke-Fa
KF
D002681:China; D002713:Chlorine / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006256:Hazardous Waste / Q000517:prevention & control*; D017745:Incineration; D019216:Metals, Heavy / Q000737:chemistry; D008956:Models, Chemical; D013816:Thermodynamics
D004396:Coloring Agents; D006256:Hazardous Waste; D019216:Metals, Heavy; D002713:Chlorine