Mercury Control and Mercury Stability in Byproducts - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 127

Fig. 5.23). In contrast to the above-mentioned experiments, the method for Hg 0
adsorption by AC in simulated flue gas should cause Hg 0 to be first oxidized into
Hg 2+ by simulated flue gas components and then be adsorbed by AC.

5.4.4.2 Hg 0 Adsorption by AC(XK) that Previously Adsorbed Simulated Flue
Gas Components

During the experiment, the adsorption temperature was controlled at 130 °C, the
amount of AC(XK) was 0.0506 g, and the total flow of simulated flue gas was
maintained at 1.3 L/min, including the 6.9% O 2 , 282 ppm NO, 8.7% CO 2 , 1,786
ppm SO 2 , 23.4 ppm NO 2 components.
As shown in Fig. 5.25, AC(XK) was the first simulated flue gas component to
be adsorbed within about 1 h and was then switched to adsorbed Hg 0 in an N 2 at-
mosphere. As a result, AC(XK) obtained the capability to adsorb Hg 0 in an N 2
atmosphere, similar to AC(YK), AC(XK), and AC(MZ-T) (Fig. 5.23). This ex-
periment showed that the promotion of simulated flue gas components on Hg 0
adsorption by XK-AC materialized on the surface of AC.

g/ O N m 3 P

.

A x is C:

Axis A : % B: pp m

20

Bypass

Hg 0 adsoprption

14 Simulation of gas adsorption

18

1900

12 16

14 CO 2 (A: ppm)

O 2 (A: ppm)
NO (B: ppm)
NO 2 (B: ppm)
SO 2 (B: ppm)
Hg 0 (C:g/(N m 3 ))
Hg 2+ (C: g/(N m 3 ))

1520

10

12

8

1140

10

6 8

760

.

6

4

.

4

380

2

2

0 0

0

0:18:10 0:36:30 0:54:50 1:13:10 1:31:30 1:49:50 2:08:10 2:26:30 2:44:50 3:03:10 3:21:30 3:39:50

Time (h:m:s)

Fig. 5.25 Hg 0 absorption of AC(XK) after the simulation of flue gas in the N 2 environment

5.4.4.3 Influence of Simulated Flue Gas Components on Hg 0 Adsorption by
XK-AC

During the experiment, the adsorption temperature was controlled at 130 °C, the
amount of AC(XK) was 0.0505 g, and the total flow of simulated flue gas was
maintained at 1.3 L/min. The main concentrations of simulated flue gas components
at the outlet of the adsorption bed are shown in Fig. 5.26. The horizontal axis
showed experimental time in h:m:s. There were three ordinate axes, namely, A, B,
and C. Of these A showed O 2 and CO 2 concentrations in simulated flue gas as a
percentage; B showed the NO and NO 2 concentrations in simulated flue gas in ppm;