Calculation method of fuel consumption of diesel generator set and cause analysis of excessive fuel consumption

1. How to calculate the fuel consumption of 400KW diesel generator set? How to calculate the fuel consumption of diesel generator

Answer: Generally speaking, 400KW diesel generator sets consume about 40.3 liters of oil per hour.

As for the size of the load, the impact on this is not very significant.

When the load is high, the throttle consumes more fuel, and when the load is low, the relative fuel consumption is also low.

The key is whether the machine is in good condition and whether the usual maintenance method is correct. If the cylinder liner and piston are worn, it will also affect the performance of the diesel generator set you bought.

Excluding the above two situations, the fuel consumption per hour is set at around 40.3 liters

Our company has a 200KW diesel generator set. It is a V12 cylinder 135 Shanghai Dongfeng diesel engine. When the load is 80%, how many liters of diesel does it consume in eight hours?

Answer: I try to answer as follows: A 200KW generator needs to be equipped with a 220KW diesel engine.

Calculated at 200 grams per kilowatt hour: 220 (KW) * 0.2 (Kg) * 8=352 (Kg) The density of No. 0 diesel is approximately 0.84 (Kg/L). 320/0.84=419 (L), that is, your 200KW diesel generator set consumes about 419 liters of fuel in eight hours, and the 400KW diesel generator set is also calculated as above.

The fuel consumption index is determined by the following factors: various brands of diesel generator sets have different fuel consumption; The size of the electrical load is related.

So please refer to the manufacturer's manual of the generator set.

Example: The fuel consumption rate of the Shanghai Dongfeng diesel engine with V12 cylinder 135 is 232.6 grams per kilowatt hour.

200 * 232.6 * 8 * 80%=297728 (grams)=297.728 (kilograms)

Calculated based on No. 0 oil: 297.728 (kg)/0.84=354.438 (liter)

Diesel specific gravity: 0.84-0.86

Oil consumption list of diesel generator: 1L (liter)=1000ML (milliliter) 1L (liter)=1L (kilowatt)=1000W (watt) 1KG (kilogram)=1000G (gram)=1L (liter) 1G (gram)=0.001L (liter)

Note: Under the same specific gravity, the ratio of water to gasoline is approximately 1:0.7-0.8, so one liter of gasoline equals 0.7-0.8 kilograms, with 1L=0.8KG.

The manufacturer parameters of diesel generator mostly use G/KW. H, which means how many grams of oil are consumed per hour per kilowatt. If you change this unit into how many liters, you can immediately know how many liters of oil are consumed, so you can also know how much you spend per hour; Some manufacturers directly tell L/H, which means how many liters of fuel are consumed per hour

To facilitate a visual understanding of the approximate fuel consumption and calculate the operating cost of the generator set; The diesel generator set public platform gives you a rough reference value (30kw-500kw).

The above data is for reference only

The specific calculation method of fuel consumption of diesel generator is as follows:

One liter of diesel is approximately 0.84-0.86 kilograms (1L=0.8-0.85KG)

Most of the parameters used by the manufacturer of the diesel generator set will use G/KW. H, which means how many grams (G) of oil are consumed by the generator set per kilowatt hour, and then change the unit into liters (L) to know your oil consumption cost per hour.

1. The normal wear caused by the long-term use of the engine or the abnormal wear caused by improper maintenance will cause the cylinder liner of the diesel engine to form longitudinal drag marks, and the cylinder diameter and piston side clearance will exceed the specified value, which will reduce the supporting force of the piston ring accordingly and cause the phenomenon of dirty oil scraping. Or, due to the internal support twisting spring inside the oil ring breaking at the opening position of the oil ring, the scraping oil is not clean and participates in combustion, causing severe oil consumption symptoms, manifested as difficulty starting the diesel engine, obvious blue smoke emitting from the exhaust pipe, and severe fuel injection from the respirator. Furthermore, the side of the piston that should have been facing upwards, when assembled, causes the combustion chamber to form an inverted state due to the inverted direction. Although it will not affect the starting of the diesel engine, the oil loss will be quite severe, with a daily fuel consumption of around 0.5 kilograms.

2. When excessive oil consumption is found, it is necessary to first check whether there is oil leakage at the connections between the engine body and the gear compartment cover, the large plate on one side of the driving wheel, the rear cover, and the cover. If there is an oil leak, attention should be paid to observing the integrity of the sealing gaskets at each connection part, and any damaged sealing gaskets should be replaced. If the sealing gasket is complete, check if the connecting screws of each part are loose. Use a wrench to tighten the loose bolts to the specified torque. If the above parts are basically normal and the oil leakage is located in the frame position, the oil casing should be inspected. The main inspection area is at the front end of the oil casing side on the same side as the driving wheel. Due to loose screws on the frame, the driving wheel has long-term friction with the frame angle iron that protects the oil casing under the pulling of the triangular belt, which will grind the oil casing through and form a gap, resulting in oil leakage