Chemical Kinetics and Oxidation Mechanisms Between O and NO/SO/Hg - Simultaneous Multi-Pollutants Removal in Flue Gas by Ozone - page 57

Washing
Tower tower

Exhaust

Flue gas
analyzer

Ozone
analyzer

Merc ury
analyzer

Ozone
generator MFC

Reactor Reactor

MFC MFC MFC MFC

MFC

SO 2 N 2

NO Air

Hg
generator

N 2

Fig. 3.8 Schematic of the experimental apparatus
presented in detail in Fig. 3.9, is a homocentric reaction tube with three channels
and made with quartz glass to reduce the non-uniform temperature effect of the
furnace. The reactor has a total length of 642 mm and an external diameter of 20
mm. Reactions proceed in the 100-mm-length and 5-mm-i.d. center tube (Item #5
in Fig. 3.9) which can be considered as an isothermal reactor. The
NO/SO 2 /Hg-enriched nitrogen gas flow entered into the reactor through Inlet 2
and then passed through a reciprocating preheating channel before entering the
center tube. O 3 was introduced into the reactor through Inlet 1, which entered a
separate preheating channel. The two well-preheated streams mixed with each
other instantly at the nozzle of the center tube with high velocities because of the
narrowing gas passage.
The washing tower is a 150-mm-length and 37-mm-i.d. glass-made cylinder,
with a total volume of approximately 161 mL and running temperature of
approximately 293 K. The alkaline absorber is filled with a 1 wt.% Ca(OH) 2
solution. A total of 1 L solution was used in one test. The alkaline solution were
recycled by using a pressure pump and then sprayed into the tower through an
atomizer nozzle at a flow rate of 0.5 L/min. The concentrations of NO, NO 2 , O 2 ,
N 2 O, and SO 2 were analyzed by the continuous emissions monitors (CEMs)
(Rosemount Analytical NGA2000, Emerson Process Management Co., Ltd.). The
mercury content in the gas was monitored by mercury CEMs (Ms-1/dm-6a,
Nippon Instrument Co.).