Mercury Control and Mercury Stability in Byproducts - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 121

Fig. 5.18 AC(XK) Hg 0 adsorption in the N 2 environment
Fig. 5.19 AC(YK) Hg 0 adsorption in the N 2 environment
The granular AC(MJ) was prepared from coal. In the adsorption experiment, the
gas flow was switched from the bypass to the fixed bed reactor 30 min after the start
of the experiment (Fig. 5.20). After the switch of the gas flow, the curves of outlet
Hg 0 concentrations in Fig. 5.20 started to fluctuate. The fluctuation resulted from
the influence of the pressure drop in the gas flow on CEM when it went through the
granular fixed bed. However, the fluctuation did not change the trend of the curve.
The centerline of the fluctuant outlet concentration curve of Hg 0 was at the same
level as the initial one. Thus, AC(MJ) did not adsorb Hg 0 in the N 2 environment.
The Hg 0 adsorption results of AC(MZ) in the N 2 environment are described in
Fig. 5.21. The adsorption curves of AC(MZ) were completely different from those
of AC(XK), AC(YK), and AC(MJ) under nearly the same conditions. Both of the
outlet Hg 0 concentration adsorption lines of AC(MZ) decreased steeply to almost
zero when the Hg 0 -laden gas flow was switched to a fixed bed reactor. Moreover,
AC(MZ) exhibited good capability to adsorb Hg 0 in the N 2 environment, because it
adsorbed almost all of the Hg 0 after the switch.