10 Fully Metered Combustion Control
Page 148 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
144 Air flow meter scaling As required
145 Fuel temperature sensor enable Optional
146 Air temperature sensor enable Optional
147 Fuel pressure sensor enable Optional
148 Air pressure sensor enable Optional
149 Maximum fuel channel compensation As required
150 Maximum air channel compensation As required
151 Action on air adjustment failure As required
152 Action on flow meter failure As required
153 Default ambient air pressure As required
154 Fuel 1 density Required for volume flow meter
155 Fuel 2 density Required for volume flow meter
156 Fuel 3 density Required for volume flow meter
157 Fuel 4 density Required for volume flow meter
The current firing rate can be fed back to an external system via a 4-20mA output signal on terminals
16, 17 and 18.
10.3.2 Limitations
When using a volume flow meter, the mass flow rate is calculated using the volume flow rate and either
default pressure and temperature values, or the measured pressure and temperature values.
The MM’s fully metered combustion control is capable of controlling the most common hydrocarbon
fuels including methane, ethanol, ethane, butane, pentane, acetylene and 1-proponal.
For FGR, oxy fuels, hydrogen and special fuels, please contact Autoflame prior to use;
The fully metered combustion control will not work on oil combustion curves.
If fully metered combustion control is used, then neither an external 4-20mA sensor for auxiliary water
level control nor external fuel flow metering using 4-20mA input can be used. When using the fully
metered system, the fuel flow metering is automatically calculated from the flow rate.
If an EGA is optioned, a conflict will occur if the 3-parameter trim is activated.
The gas/air pressure sensor recommission feature is not available when using volume flow meters, if
these pressure sensors need to be recommissioned; a full recommission of the burner is required. This is
due to the pressures needing to be stored at the same time as the required volume flow.
Economiser or deaerator options for steam/heat flow metering cannot be used if the temperature
sensors or make-up flow meter inputs are being used for volume flow metering. The IO module can be
used instead for deaerator.
During running the system can adjust the channel 2 air servomotor from the commissioned closed and
open positions to bring the combustion to the commissioned fuel-air ratio, as the fuel servomotor
moves. However, the rest of the channels can only be moved from the low fire and high position, and
not outside of this range. This means that if the fuel servomotor is at the commissioned high fire position,
it cannot move further. The firing rate is limited to less than 100% and if it is critical to the system
operation, then the actual firing rate should be monitored.
The calorific value must be entered corrected to the 1013mbar and 15
O
C, see options 61 to 64.
To Next Page
Loading...
Need help?
General
