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Konus Burners, Primary, and Vat Pumps

EV2 Directional Valve

This valve is controlled by the AV4 air pilot valve. When in the normal
mode of operation, the AV4 solenoid is energized, which directs pilot
pressure to shift the EV2 valve closed. Flow is blocked from the
operating Konus burner to the suction of the vat pump. When in the
emergency mode of operation, the AV4 solenoid will de-energize. Air
pressure holding the valve closed will then be ported back to the
atmosphere. This permits the EV2 valve to shift open. This creates a
flow path from the No. 2 Konus burner to be ported to the suction line
of the operating vat pump. The vat pump will then port the oil through
the HE heat exchanger located in the log pond. The heat exchanger
will dissipate the heat in the oil to the ponds. The thermal oil will then
flow through the No. 3WV valve and back into the No. 2 burner.

F1 Filter

This filter will remove particles of contamination from the flow
supplied by the vat pumps prior to being ported through the No. 3WV
valve. The filter should be changed or cleaned regularly to prevent
contaminants from entering the valve and operating Konus burner.

FM1 - FM2 Flow Transducers

These transducers are used to monitor the flow through the orifice
plates at the burner outlets. There are four transducers on each
burner to monitor the pressure drop across the four orifices. For a
given pressure drop across the FO orifice, a specific flow rate will be
maintained for a given oil temperature. The flow meter scale is 0 –
600, which represents a 0 - .6 BAR pressure drop across the orifice.
Once the temperature is above the BO2 setting (140°C), a reading of
300 (.3 BAR) or above should be read. The normal pressure drop
indicated by the meter is approximately .425 BAR. If the pressure
difference drops below .1 BAR, the burner is shut down. This will
occur if the No. 1 and 2 meters or the No. 3 and 4 meters are reading
less than 100 and the oil temperature is not below 140°C as indicated
by the BO2 temperature switch. Once this occurs, an alarm delay
timer starts for three seconds. The “flow control” safety interlock then

Page 6 Troubleshooting Thermal Oil Systems