C.I.B. UNIGAS - M039207CB
20
Guidelines for the appropriate use of heavy oil
For a correct operation of heavy oil or dual fuel burners (gas - heavy oil), the supply plant must be correctly build and it must ensure two
fundamental conditions:
z
CONSTANT PRESSURE
z
CONSTANT TEMPERATURE
Here below we explain why it is essential to heat the oil and keep it under pressure.
Consider, as an example, a fuel oil with the following properties:
z
Fuel oil BTZ (low sulphur rate)
z
Viscosity from 3 to 5 °E at 50 °C
Such a fuel (see curve n. 3 in Fig. 12), at a temperature of 20° C, changes its viscosity from 3 - 5 °E to 15-20 °E and, at 10° C the visco-
sity exceeds 40° E.
In such conditions, obviously, the fuel couldn’t be carried from the tank to the burner.
Once the oil has been heated, it can’t be sucked by the burner pump, unless you keep it in pressure. In fact, as showed on drawing in
Fig. 14, the pump manufacturer states that the minimum feeding pressure must be 1 bar at 40 °C temperature.
Should you try to suck the heated oil directly from the tank, you could get cavitation. The burner pump would constantly loose pressure
as long as you heat the fuel. In this way you bring the nozzle pressure to values different from the one stated by the nozzle manufactu-
rer. In such way the atomization would result incorrect.
From the diagram in Fig. 13, you will find the pre-heating temperature of the oil according to viscosity and, from diagram in Fig. 14, you
get the pump feeding pressure according to temperature.
Therefore, it is necessary in order to set up a suitable oil circuit, look at the diagrams in Fig. 16 and Fig. 17, taken from UNI 9248 “FEE-
DING LINES FOR LIQUID FUELS TRANSPORT FROM TANK TO BURNER”.
In any case, whatever is the choosen solution to realise the oil circuit, you must act according to what is mentioned here above (con-
stant pressure and constant temperature).
After setting up the feeding circuit, you have to decide the temperature and pressure values to be set up in the components of the fee-
ding pipeline and of the burner.
Please find here below, a set up table regarding several types of fuels.
Tab. 1 - Supply pipeline
Tab. 2 - Burner
* The temperature in the pre-heater must be set to get a viscosity in the nozzle from 1.4 to 1.6 °E.
FUEL
VISCOSITY
AT 50 °C
PIPELINE
PRESSURE
PIPELINE
TEMPERATURE*
PUMP SUPPLY
TEMPERATURE
(DIAGRAM IN Fig. 12)
°E
bar
°C
°C
Fluid BTZ
(ecoflu)
3
7
1 - 2
20
30
High viscosity BTZ
(Ecoden)
7
15
1 - 2
50
50
High viscosity
15
50
1 - 2
65
80
FUEL
VISCOSITY
AT 50 °C
NOZZLE
PRESSURE
MEASURED IN
THE GUN
RETURN
NOZZLE
PRESSURE
TEMPERATURE ON
THE PRE-HEATING
RESISTORS
THERMOSTAT
TR*
TEMPERATURE
OF THE
RESISTORS
SAFETY
THERMOSTAT
TRS
TEMPERATURE
ON THE OIL
ENABLING
THERMOSTAT
TCN
TEMPERATURE
ON THE PLANT
ENABLING
THERMOSTAT
TCI
min.
max.
min.
max.
°E
bar
bar
°C
°C
°C
°C
Fluid BTZ
(ecoflu)
3
7
25
7
20
100
115
190
80
-
High
viscosity
BTZ
(Ecoden)
7
15
25
7
20
125
140
190
100
60 - 80
High
viscosity
15
50
25
7
20
145
160
190
110
70 - 90
Summary of Contents for KTP1030
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Page 100: ...16 Note Specifications and data subject to change Errors and omissions excepted...
Page 101: ...KM3 Modulator USER MANUAL M12927CA Rel 1 0 10 2020...
Page 102: ...M12927CA MOUNTING 2...
Page 118: ...1 RWF55 5X RWF55 6X User manual M12926CA Rel 0 1 10 2015...
Page 119: ...2 DEVICE INSTALLATION Fixing system Drilling dimensions...
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Page 141: ...23 Note Specifications and data subject to change Errors and omissions excepted...
