Xylem WEDECO SMOevo PLUS Series, Оригинальное руководство

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Manual Ozone Generating System SMOevo
PLUS
System Description
Manual_SMOevoPLUS_eng_01.2019.doc
page 64 of 179
5.5.2.2 Control of Required Ozone Mass
This control option requires ozone concentration measurements (option M2):
In addition to the setpoint Required Ozone Mass another setpoint must be provided: Either
the Ozone Concentration or Gas Flow Converter. The non-selected setpoint is calculated by
the PLC. The selected setpoint is continuously retained. In the event of falling below or
exceeding the minimum or maximum limit values of the Gas Flow or the maximum limit value
of the Ozone Concentration respectively due to very low or very high ozone mass to be
required, the PLC independently corrects the preset setpoints in order to ensure optimum
operation of the Ozone System. The value correction is displayed by an event message on
the HMI.
Monitoring of the limit values and, if necessary, correction of the setpoints is carried out with
the Required Ozone Mass Control and with the Dose Control.
Setpoint: Variable Value
Setpoint:
Required Ozone Mass (g/h) = Gas Flow (Nm³/h) *
Ozone Concentration
(g/Nm³)
Or
Setpoint :
Required Ozone Mass (g/h) = Ozone Concentration (g/Nm³) * Gas Flow (Nm³/h)
5.5.2.3 Dose Control
The Required Ozone Mass for a given Ozone Dose in the Process Water Flow is calculated
as follows:
mO3 = Q * dO3
m
O3
: Ozone Mass
Q : Flow Volume Process Water (m³/h)
Analog recorded 4-20 mA value,
d
O3
: Ozone Dose (g
O3
/m³)
Ozone Mass in Process Water