Influences of relative humidity on the formation and decomposition of ozone by ultraviolet radiation from a low pressure mercury vapor quartz lamp were studied.
Main spectral lines of the lamp for formation were 184.9nm and 253.7nm, but it for decomposition was 253.7nm.
The lamps were made in cylinder shaped, and were 8W.
Two ways were applied in the measurement of the relation between gas flow rate and ozone produced.
In the first experiment, the relative humidity of the feeding air was varied at eleven levels (0-100%), keeping the temperature constant.
When the gas flow rate was 54/min or under, the produced ozone concentration decreased with enhancement of relative humidity. The decomposition ratio of ozone was maximum at the gas flow rate of 0.11
l/min independently of the relative humidity. And, influence of relative humidity was not recognized over the gas flow rate of 5
l/min or over.
Additionally, considerations were also given to the relation between the relative humidity and maximum ozone concentration, and the relation between the relative humidity and decomposition ratio of ozone at each maximum concentration.
In the second experiment, the relative humidity of the feeding air was varied at ten levels (0-80%), keeping the temperature constant.
The decomposition ratio became high increasing relative humidity, and it was high at the gas flow rate of about 0.11
l/min or under, and it decreased with increasing gas flow rate.
And, influence of relative humidity was not almost recognized at the gas flow rate of about 3
l/min or over.
Equations between relative humidity and maximum ozone concentration, and decomposition ratio in each gas flow rate were obtained.
Other considerations were also given to the ozone concentration produced only by the ultraviolet ray of 184.9nm radiated from the ozone formation lamp after the careful analysis of the relation between the inital ozone concentration in the formation reaction and the residual ozone concentration in the decomposition reaction.
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