How to choose diesel for diesel generator set?
After the installation of diesel generator set. Before putting into normal operation, diesel oil and engine oil should be selected correctly.
1. Main performance of diesel oil.
The lowest temperature of diesel oil spontaneous combustion without external ignition is called the spontaneous combustion temperature of diesel oil. The spontaneous combustion performance of diesel is expressed by cetane number. The higher the cetane number is, the lower the spontaneous combustion temperature is, and the easier the ignition is. But too high or too low cetane number is not good. The cetane number is too high. Although the fire is easy, the work is gentle. But the stability is poor and the fuel consumption is high. The cetane number is too low and the diesel engine works rough. The ten injection alkane number of diesel used in general diesel engine is 30-60.
2. The viscosity of diesel oil is the main index affecting the atomization of diesel oil.
It shows the degree of thinness and consistency of diesel oil and the difficulty of flowing. High viscosity, large oil droplets and long spray distance. However, the dispersion is poor and the mixture with air is not uniform. Diesel engine is easy to smoke when working. Fuel consumption increases. The lower the temperature, the higher the viscosity. The opposite is true.
3. The flow performance of diesel is mainly expressed by freezing point.
The so-called freezing point refers to the temperature at which diesel loses its fluidity. If the temperature of diesel oil is lower than freezing point. Diesel doesn’t flow. The fuel supply will be interrupted. The diesel engine doesn’t work. Therefore, the freezing point is the main basis for selecting diesel oil.
4. Specification of diesel oil.
Domestic diesel is divided into light diesel and heavy diesel. Light diesel oil has good volatility. According to the quality, it can be divided into three grades: superior products, first-class products and qualified products. Each grade is divided into six grades according to its freezing point. They were 10, 0, – 10, – 20, – 35, – 50. Represents the freezing point temperature of each. Heavy diesel oil has poor volatility. The density and viscosity are large and there are many impurities. Heavy diesel oil can be divided into three grades: No.10, No.20 and No.30. The larger the number, the greater the viscosity.
5. Selection of diesel oil.
Diesel engine should be selected according to the speed, use area and season. Generally, the diesel engine with rated speed above 1000r / min should choose light diesel. No.10 light diesel is suitable for high speed diesel engine with preheating equipment. No.0 diesel oil is suitable for use in areas where the minimum temperature is above 4 ℃. -No.10 light diesel oil is suitable for use in areas with minimum temperature above – 5 ℃. -No.20 light diesel oil is suitable for use in areas with minimum temperature above – 14 ℃. -No.35 light diesel oil is suitable for use in areas with minimum temperature above – 29 ℃. -50 light diesel oil is suitable for use in areas with minimum temperature above – 44 ℃. For heavy diesel, the diesel engine with rated speed of 500-1000r / min is usually selected as No. 10. No.20 diesel engine with rated speed of 300-700r / min is selected. No.30 diesel engine with rated speed below 300r / min is selected.