baltur BT 75 DSNM/D Manual De Instrucciones página 22

VARIANTS FOR BURNERS PROVIDED WITH STE-
E
AM PRE-HEATER TO HEAT THE FUEL OIL
N
IThe burner can be provided with a pre-heater of the fuel oil which
operates with steam; the fuel will be heated by steam and there
G
will be a consequent saving in electricity.
L
This device consists of a small tank in which steam circulates and
inside the tank is a coil in which the fuel oil to be heated circulates.
I
This particular device permits a notable reduction in the dimension
of the pre-heater. When the burner starts up, cold fuel oil would be
S
forced to pass through the coil of the steam pre-heater still cold
because it would not yet have been heated by the steam. The high
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viscosity of the fuel (cold), the notable development (length) of the
coil its relatively small diameter (necessary in order to obtain a high
thermal exchange), would determine a strong pressure loss and con-
sequently the fuel would reach the nozzle at insufficient pressure.
To avoid this situation, the steam pre-heater has been provided with
a manual-controlled by-pass which prevents, when open, the fuel
passing through the coil (see BT 8576).
INSTALLATION
The user should provide and install on the pipeline that takes the
steam to the fuel heater the following: a gate valve, a suitable
pressure reducer (adjustable from 1 to 8 bar) and a control mano-
meter (end of the scale 10 bar).
Steam Pressure at manometer
approximate bar
Corresponding Temperature °C
SCHEMATIC LAYOUT FOR STEAM PRE-HEATER INSTALLED UPSTREAM FROM THE ELECTRIC PRE-
HEATER
TO BE INSTALED BY
THE CUSTOMER
FROM BURNER PUMP
1 - LEAK DISCHARGE
2 - STEAM PASSAGE INDICATOR
3 - DISCHARGE CONDENSATE
4 - FILTER
5 - MANUALLY CONTROLLED BY-PASS GATE VALVE TO EX-
CLUDE THE PRE-HEATER WHEN IT'S COLD
6 - ELECTRIC PRE-HEATER
7 - SELF CLEANING FILTER 0.3 MM
8 - THERMOMETER
9 - MIN PRE-HEATER THERMOSTAT
Do not recuperate the condensate which is discharged from the
heater to avoid, in case there is a leak in the coil, fuel oil going into
the steam system.
REGULATION
When the boiler has reached sufficient pressure, open the gate
valve which allows the steam inflow to reach the oil pre-heater, and
open slightly the "air discharge" gate valve fitted on the condensate
outlet pipeline.
While the steam is discharging from the gate valve slightly opened,
regulate the pressure reducer at a sufficient value in order to heat
the fuel oil to a temperature a little above (about 10 ÷ 15 °C) that
at which the regulation thermostat of the electric heater has been
set. An orientative regulation can be carried out by operating
the pressure reducer in function with the value indicated by the
manometer; if necessary, correct the regulation after having con-
trolled the temperature of the fuel coming out of the steam heater.
When regulation has been carried out, close the air discharge gate
valve. The thermostats (minimum and regulation) of the electric
pre-heater should be regulate normally as described in Chapter
"Start up and Regulation".
1 1,5 2 2,5
120 127 133 138
10- MAX PRE-HEATER THERMOSTAT
11- PRE-HEATER ADJUSTER THERMOSTAT
12- THERMOMETER
13 - PLUG FOR PRESSURE GAUGE
14 - STEAM PRE-HEATER
15 - CUT-OUT GATE VALVE
16 - STEAM PRESSURE REGULATOR ADJUSTABLE FROM 1÷8 BAR
17 - STEAM GAUGE 0÷10 BAR
A) STEAM ENTRY MIN 12 BAR
B) AIR DISCHARGE
C) DISCHARGE CONDENSE
20 / 30
0006080092_201011
3 3,5 4 4,5
143 147 151 155
5 6 7 8
158 164 169 174
AT THE NOZZLE