Function and Effect of Boiler Oil Burner Fittings

Function and Effect of Boiler Oil Burner Fittings
The fuel oil burner of the boiler can burn normally, but it will stop automatically after dozens of seconds of ignition. The typical reason for this disadvantage is that the flame sensor of the burner accessories is dirty. The flame sensor is a photosensitive resistor. When it is illuminated by light, its resistance value drops to a low impedance condition. When there is no light, its resistance value rises to a high impedance condition.
The controller in the fuel burner judges whether the combustion process is continuous according to the resistance value of the flame sensor. If the combustion is continuously resisted by the flame sensor with high resistance, the fuel supply is immediately connected to avoid the accumulation of unburned diesel. The flame sensor probe is located in the air duct of the burner. Because of black smoke, backfire, dust and other reasons, its appearance is very simple and dirty, and then it loses its photosensitive function. Check the sensor probe and clean its surface with alcohol or detergent if necessary. The ignition is normal, but the exhaust smoke color is abnormal. The diesel injected into the burner by the boiler oil burner is mixed and burned at the same time. When the air supply volume is combined, the atomized CO2 and steam exhaust are colorless.
When the boiler oil burner is short of air supply, it will form incomplete combustion of diesel oil to generate CO and carbon particles, and then the exhaust will emit black smoke. However, if the air intake is too large, the strong wind may blow away the oil mist that is too late to burn, forming a white smoke. The common reason for black smoke from exhaust is that the air inlet valve of combustion is too small, while the common reason for white smoke is that the air inlet valve is too large. In both cases, the air inlet valve should be adjusted from the beginning. During adjustment, observe the exhaust smoke while regulating the opening of the damper until the exhaust smoke is nearly colorless. Another reason for black smoke from exhaust is poor diesel atomization. The oil mist contains large droplets, which cannot be fully mixed with air. Black smoke occurs due to incomplete combustion of some parts. The causes of poor diesel atomization are as follows: aging or blockage of the nozzle severely reduces its atomization capacity; The oil outlet pressure of the oil pump is too high or too low. If the oil pump pressure is too low, the atomization effect is poor. However, if the oil pump pressure is too high, the injection pressure will be low. This is because the oil delivery volume of the oil pump is inversely proportional to the oil delivery pressure. If the oil pressure is too high, the oil delivery volume must drop because the orifice of the nozzle is unchanged, so the pressure difference between the two ends of the nozzle decreases, forming a poor atomization of fuel injection, often accompanied by black smoke.