formation of nitrogen oxides (Fig. 13). The oxides of sulfur are absorbed and
oxidized to sulfuric acid by means of a hydrogen peroxide solution. This solution
is flushed with air to remove carbon dioxide. The sulfur as sulfate in the absorbent is
determined by titration of the sulfuric acid with standard sodium hydroxide. The
Glass Rod
Support
Chimney
Spray Trap
To Vacuum Monifold
Absorber
CO 2 – O 2
to
Chimney
CO 2 – O 2
to
Burner
Fig. 12 Details of assembled
lamp unit
Vacuum Manifold
Lamp
Unit
Chimney
Manifold
Chimney
Control
Valve
Burner
Control
Valve
Burner Manifold
Coarse
Sintered
Glass Plate
Heater
From CO 2 Supply
Cylinder
From O 2 Supply
Cylinder
Pressure
Reducing
Valves
(10 psi)
(0.70 kg per sq cm)
(50 psi)
(3.5 kg per sq cm)
Pressure
Regulator
Manometer
Vacumm
Supply
Flow
meter
Trap
Trap
20 cm
2 cm
40 cm
Vacuum
Regulator
Fig. 13 Schematic diagram of the CO 2 –O 2 supply manifold
680
D.S.J. Jones