Environmental Engineering Reference
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During Coal Combustion
Fig. 4.79 is the distribution characteristic of the Cl species in the furnace. Figs.
4.79(a), (b), (c) show the HCl, Cl 2 , and Cl concentration distribution respectively.
According to the figures, in the high temperature environment of the furnace, the Cl
element mainly existed in the form of HCl. We could also see a band of high HCl
concentration which was brought about by the pulverized coal in the primary air.
Fig. 4.79(b) shows the Cl 2 concentration distribution is surprisingly similar to
HgCl 2 in Fig. 4.78(b). It might prove that HgCl 2 's generation was mainly dependent
on the chemical reaction of Hg and Cl 2 . At the outlet region of the furnace chamber,
along with the decreasing temperature, there was a large amount of Cl 2 generated
here. But the absolute amount was still small compared with HCl. We could also
find from Fig. 4.79(c) that in the high temperature environment of the main com-
bustion region there was a lot of free radical Cl. But when the height of the furnace
chamber was further increased, the temperature decreased gradually, and the Cl free
radical disappeared.
(a) HCl distribution in furnace (b) Cl 2 distribution in furnace
(c) Cl distribution in furnace
Fig. 4.79 Cl species distribution in furnace
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