Gases are no longer necessary! MULTI-FUEL HOSE BURNER for heating.
I made a multi-fuel burner that works on the principle of fuel evaporation and turns fuel into gas. It can be used for installation in a heating boiler, used as an outdoor stove or used for camping.
Influence of oil viscosity for a burner
Influence on the flow rate sprayed by the nozzle
On an oil burner, whatever the viscosity of the oil, the pressure is kept constant by the pressure regulator of the pump.
But if the oil is more viscous, it adheres more easily to the circumference of the nozzle orifice and will be sprayed through it over a larger area.
For the same pressure, the fuel oil flow at the nozzle outlet increases when the fuel oil is more viscous. The flow rate is not only proportional to the square root of the pressure, but also to the spray area actually used by the oil in the nozzle orifice.
Influence of viscosity on nozzle spray angle
The spray angle of the fuel oil is reduced when the fuel oil is more viscous.
At very low temperatures, this can cause difficulty in igniting the flame, the oil droplets passing too far from the ignition arc provided by the electrodes.
Influence of viscosity on combustion quality
As the viscosity increases, the fuel oil velocity decreases in the rotation chamber located between the core and the spray orifice. The fuel oil is then sprayed into thicker droplets. These droplets mix less easily with the air, which implies poorer combustion, and therefore inevitably a lower efficiency.
Role of the oil heater
Placed just before the nozzle, the heater increases the temperature of the fuel oil before it is sprayed.
This allows:
- to reduce the viscosity of the fuel,
therefore to improve its spraying
and its combustion,
- to attenuate the variations of viscosity of the fuel oil related to the storage temperature
and the characteristics of the fuel purchased.
In summary, this increases the efficiency of the boiler.
Note:
As the flow decreases by 5 to 20% (on average 10%) when using a heater, it will be necessary to correct and increase its starting value.
This involves either increasing the pump pressure or even choosing a higher caliber nozzle.
In both cases, this will have the advantage of reducing the risk of the nozzle becoming clogged and clogged.
Heater operation
The heater is mainly composed of 3 elements:
A tube in which the fuel oil circulates
A heating body containing an electric resistance, allowing to heat the fuel oil
· A thermostat, electrical contact which closes when the oil is hot.
The heater is electrically connected to the control box by a cord made up of 4 wires.
As soon as the boiler is on demand,
the resistance of the heating body is subjected to "a VOLTAGE of 230 volts".
Oil preheating begins.
When the oil is hot enough,
the thermostat contact closes and sends an electric current back to the control box.
Once the signal has been received from the thermostat, the control box can authorize the burner to start.
It continues the start-up cycle and controls the pre-ventilation.
Hearing the fan impeller "blow" is proof that the oil heater is working and that its thermostat contact has just closed.
Noticed :
The temperature value 50°C at which the thermostat closes is taken as an example. It can vary considerably depending on the model and brand of the heater.
Heater control
"SHUNT" of the thermostat
When the control box is powered, but fails to start the pre-ventilation and to run the fan, it is likely that the preheating of the fuel oil is not taking place.
To determine if the problem really comes from the heater, it is necessary to "shunt" the thermostat of the heater at the level of the control box.
"Shunting" the thermostat consists of replacing the thermostat contact with a wire, in order to make the control box believe that this contact is still closed.the control will then consider that the fuel oil is still hot. It will therefore immediately power the motor and you should hear the fan blowing.
Gases are no longer necessary! MULTI-FUEL HOSE BURNER for heating.
I made a multi-fuel burner that works on the principle of fuel evaporation and turns fuel into gas. It can be used for installation in a heating boiler, used as an outdoor stove or used for camping.
Influence of oil viscosity for a burner
Influence on the flow rate sprayed by the nozzle
On an oil burner, whatever the viscosity of the oil, the pressure is kept constant by the pressure regulator of the pump.
But if the oil is more viscous, it adheres more easily to the circumference of the nozzle orifice and will be sprayed through it over a larger area.
For the same pressure, the fuel oil flow at the nozzle outlet increases when the fuel oil is more viscous. The flow rate is not only proportional to the square root of the pressure, but also to the spray area actually used by the oil in the nozzle orifice.
Influence of viscosity on nozzle spray angle
The spray angle of the fuel oil is reduced when the fuel oil is more viscous.
At very low temperatures, this can cause difficulty in igniting the flame, the oil droplets passing too far from the ignition arc provided by the electrodes.
Influence of viscosity on combustion quality
As the viscosity increases, the fuel oil velocity decreases in the rotation chamber located between the core and the spray orifice. The fuel oil is then sprayed into thicker droplets. These droplets mix less easily with the air, which implies poorer combustion, and therefore inevitably a lower efficiency.
Role of the oil heater
Placed just before the nozzle, the heater increases the temperature of the fuel oil before it is sprayed.
This allows:
- to reduce the viscosity of the fuel,
therefore to improve its spraying
and its combustion,
- to attenuate the variations of viscosity of the fuel oil related to the storage temperature
and the characteristics of the fuel purchased.
In summary, this increases the efficiency of the boiler.
Note:
As the flow decreases by 5 to 20% (on average 10%) when using a heater, it will be necessary to correct and increase its starting value.
This involves either increasing the pump pressure or even choosing a higher caliber nozzle.
In both cases, this will have the advantage of reducing the risk of the nozzle becoming clogged and clogged.
Heater operation
The heater is mainly composed of 3 elements:
A tube in which the fuel oil circulates
A heating body containing an electric resistance, allowing to heat the fuel oil
· A thermostat, electrical contact which closes when the oil is hot.
The heater is electrically connected to the control box by a cord made up of 4 wires.
As soon as the boiler is on demand,
the resistance of the heating body is subjected to "a VOLTAGE of 230 volts".
Oil preheating begins.
When the oil is hot enough,
the thermostat contact closes and sends an electric current back to the control box.
Once the signal has been received from the thermostat, the control box can authorize the burner to start.
It continues the start-up cycle and controls the pre-ventilation.
Hearing the fan impeller "blow" is proof that the oil heater is working and that its thermostat contact has just closed.
Noticed :
The temperature value 50°C at which the thermostat closes is taken as an example. It can vary considerably depending on the model and brand of the heater.
Heater control
"SHUNT" of the thermostat
When the control box is powered, but fails to start the pre-ventilation and to run the fan, it is likely that the preheating of the fuel oil is not taking place.
To determine if the problem really comes from the heater, it is necessary to "shunt" the thermostat of the heater at the level of the control box.
"Shunting" the thermostat consists of replacing the thermostat contact with a wire, in order to make the control box believe that this contact is still closed.the control will then consider that the fuel oil is still hot. It will therefore immediately power the motor and you should hear the fan blowing.
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