Mercury Control and Mercury Stability in Byproducts - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 110

5.3.1.5 Hg 0 Adsorption Ability of Vermiculite

As with the others, Hg 0 adsorption experiments by vermiculite and
CTMAB-modified vermiculite were conducted under the same conditions (Hg 0
concentration: 18.3 g/m 3 ; temperature: 125 °C; simulated flue gas: BL; flow: 1
L/min; amount of sorbent: 100 mg). The adsorption kinetic curves of Hg 0 by ver-
miculite (ZS), 1% CTMAB-modified vermiculite (ZS1), 3% CTMAB-modified
vermiculite (ZS2), and 6% CTMAB-modified vermiculite (ZS3) are shown in Fig.
5.8. Of these, ZS3 had the maximum adsorption quantity of Hg 0 , which had the
biggest interlamellar spacing of 3.47 nm through 6% CTMAB-modified bentonites.

0.7

0.6

0.5

0.4

ZS
ZS1
ZS2
ZS3

0.3

0.2

0.1

0.0

0 5 10 15 20 25 30 35

Time (min)

Fig. 5.8 Hg 0 adsorption by different vermiculites

5.3.1.6 Hg 0 Adsorption Ability of Biomass Semicoke

Hg 0 adsorption experiments by biomass semicoke from straw were conducted under
the same conditions (Hg 0 concentration: 18.1 g/m 3 ; temperature: 125 °C; simu-
lated flue gas: BL; flow: 1 L/min; amount of sorbent: 1.045 g). The adsorption
kinetic curves of Hg 0 by semicoke are shown in Fig. 5.9. Biomass semicoke had a
low adsorption quantity of Hg 0 because of its poor surface characteristic, only 8.13
m 2 /g specific surface area, 0.011 cm 3 /g micropore volume adn 3.32 nm average
pore size.

0.12 0.5

0.10

0.4

0.08

0.3

0.06

0.2

0.04

BM1

BM2

0.1

0.02

0.00 0.0

0 5 10 15 20 25 30 35

Time (min)

Fig. 5.9 Hg 0 adsorption by biomass semicoke