The importance of the location of sodium chlorite application in a multipollutant flue gas cleaning system

Figures & data

Table 1. Experimental process parameters

Parameter	Value
SO2 (in nitrogen)	1500 ppm
NO (in nitrogen)	200 ppm
CO2 (compressed)	11% vol.
O2 (compressed air N2/O2)	8% vol.
N2 (compressed)	Balance
Hg^0	206 µg/m^3
Flue gas flow	2 L/min
Scrubber temperature	55 °C
Oxidizing reactor temperature	22 °C
NaClO2 concentration	0–0.008 M
CaCO3 slurry concentration	0.5 wt%

Figure 1. Schematic diagram for the removal of SO₂, NO_x, and Hg from the simulated flue gas—Configuration 1.

Figure 2. Schematic diagram for the removal of SO₂, NO_x, and Hg from the simulated flue gas—Configuration 2.

Figure 3. Schematic diagram for the removal of SO₂, NO_x, and Hg from the simulated flue gas—Configuration 3 (multipollutant scrubber).

Figure 4. Amount of NO oxidized for Configurations 1, 2, and 3 at different chlorite concentrations.

Figure 5. Amount of NO_x absorbed for Configurations 1, 2, and 3 at different chlorite concentrations.

Figure 6. Amount of Hg removed for Configurations 1, 2, and 3 at different chlorite concentrations.

Figure 7. Effect of the temperature in the oxidizing reactor.

Table 2. Average pollutant removal efficiencies for all configurations and three different chlorite concentration (%)

	Conf. 1	Conf. 2	Conf. 3	Conf. 1	Conf. 2	Conf. 3	Conf. 1	Conf. 2	Conf. 3
	0.0007 M ClO2 ^−			0.003 M ClO2 ^−			0.008 M ClO2 ^−
NO	7.0	41	8.0	95	100	70	100	100	100
NOx	6.0	25	5.0	70	38	30	87	42	48
Hg	8.0	99	8.0	92	91	100	100	100	100
SO2	100	100	100	100	100	100	100	100	100
Note: The most effective configuration for each of the three chlorites range of concentrations is bolded.