Mercury Speciation Transformation During Coal Combustion - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 78

Temperature

(K)

25

20

15

10

5

0

10
Boiler depth (m)

0

Fig. 4.74 Temperature distribution in the furnace (K)

20 30

1700

Transection average temperature
Transection maximum temperature
Temperature in-situ

1600

1500

1400

1300

DŽ

1200

1100

1000

900

10 15 20 25 30 35 40

h (m)

Fig. 4.75 Comparison results between CFD and in-situ

4.5.2.2 Gas Components and Hg Distribution Fields

Figs. 4.76 and 4.77 show the concentration of gas components and Hg distribution
in the furnace. The temperature, velocity and the densities of O 2 , CO, HCl, H 2 S, Cl,
Cl 2 , Hg, HgCl 2 , HgO in the lower secondary air section are shown in Fig. 4.76. The
high temperature area and the high speed area almost coincide, which is outside the
rotating flame ball, as shown in Figs. 4.76(a) and (b). The concentration of O 2 and
CO is shown in Figs. 4.76(c) and (d). The former represents the oxidizing atmos-
phere and the latter the reducing atmosphere. The oxygen with high concentration
from the secondary air inlet has a deflection because of the brush from upstream.