Burner for Kerosene/Diesel Oil Water Boiler

Solenoid shut off valve as close to the nozzle as possible. So when power goes off valve closes. Will keep the excess oil from spraying. Which the nozzle has to bleed off from the pump when stopped.

As electricity supply seems to be an issue were the boiler is located, instead of using an inverter and a bank of batteries, I would turn the entire system (blower + electro-valves + controllers) to 12V. Electricity would be supplied by a couple of batteries (with less amps tan required for the inverter). Batteries can be charged directly with a regular charger... provided electricity supply is really an issue requiring more backup, you also can use other sources for 12V generation as solar panels, an aerocharger or even a water turbine. Good Luck in this project!

Oil burners are generally configured as follows.

There is a medium (a few atmospheric pressure) pump to the spray nozzle, which in a conical spray atomizes the oil. There is one or two spark plugs with normally wider gap than in cars, in the path of that spray. As soon as the blower starts, the pump starts and the high voltage transformer starts for the spark plugs. All fed from 50 or 60 Hz power mains. When flame is ignited, an electronic eye (photosensor in an evacuated glass tube) senses it, and the ignition is turned off. The electronic eye keeps sensing the flame. That's it.

Since nobody can guarantee, that ignition occur in the very split second the spraying starts, raw oil will sometimes will be sprayed to the walls. Hence smoking then, or the next time. Treat it as diagnostics, for when something goes really wrong.

Blowers run in the 100-200Watts, Pumps a bit more. Neither has more than 2x for staring current. But how about measuring your own.? An ammeter will do fine.

The boiler is a manually fired one.For any boiler for safety reason,during stoppage the fuel should cut first,which is reverse in your case.Other than smoking there is a chance of explossion.

so far I understand your fuel is supplied by either gravity flow or by the pressure in the tank.

Solinoid valve on fuel line is the simplest solution,or you can install a pilot burner which will run on by ambient air.

This is a minimum requrement for safety.

Try using a portable air compressor as an air blower with the required CFM which will be fuel operated.