The HORN® MOB burner for oil is installed as under-port burner in regenerative cross fired or end fired furnaces. Its design enables the furnace operator to adjust the flame formation in two ways: the dimension of the oil nozzle and the dimension of the air nozzle.
The performance adjustment and flame adjustment are executed by means of the relevant nozzle drillings.
The air nozzle cross-section has to be designed according to the available oil viscosity, the atomising compressed air pressure and the desired flame length on-site. Depending on the oil viscosity and the desired sharpness of the flame, the atomising air consumption lies between 0.2 – 0.5 m³/kg fuel. The available air pressure should be between 2.5 – 3.5 bar.
Dimensioning of the oil nozzle depends on the oil quantity, oil viscosity and type of atomising air. In case of atomisation by compressed air only, the working pressure of the oil is relatively low, which amounts to 0.3 - 2.0 bar in the oil nozzle area, according to the root form of the flame. Therefore the oil nozzle will have a relatively large nozzle drilling in order to reduce the oil velocity which furthermore reduces the contamination of the nozzle by means of deposits.
Compressed air or natural gas can be used as an atomising medium. When used with natural gas, it is a quasi-hybrid version with a double energy input. Atomising quantity: 0.2 – 0.5 m³ air or gas per kg of oil.
The fine-tuning of the nozzles can only take place on-site at the melting end due to various influencing factors. Therefore it is necessary to start with the smallest basic nozzle and to increase the drilling step by step after the evaluation of the achieved waste gas values until the best possible results are attained. Therefore the values of exhaust gas temperature, exhaust gas O2 content, exhaust gas CO2 and NOx or NO2 values (at 8 % O2 in the exhaust gas) have to be supervised in order to optimise the flame step by step until the measuring values cannot be improved further. With this flame adjustment, the melting process and the glass quality can be improved while having the lowest possible energy consumption.
The oil connection and the atomising air connection of the MOB burner are made by way of a quick-release coupling.
1. Air nozzle
2. Oil nozzle
3. Nozzle guidance
4. Oil piping with casing
5. Outside piping
6. Counter ring
7. Quick action stop coupling for oil
8. Quick action stop coupling for air
|Oil quantity||Oil connection||Atomising connection|
|Multi Oil Burner 1||40 to 400 kg/h||½”, approx. 2.5 bar||¾”, approx. 3.5 bar|
|Multi Oil Burner 2||70 to 700 kg/h||¾”, approx. 2.5 bar||1”, approx. 3.5 bar|