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Matters choose diesel generator sets to note


1. Determination of the capacity of diesel generators

According to the unit long-term continuous operation of the output power to meet the maximum load calculation of the whole project, and should be based on the importance of the load to determine the capacity of the generator unit spare capacity ... ...


1. Determination of the capacity of diesel generators

According to the unit long-term continuous operation of the output power to meet the maximum calculation of the total load calculation, and should be based on the importance of the load to determine the capacity of generating units standby unit. The continuous output power of the diesel engine is typically 0.9 times the rated power.

2. Determination of the number of commonly used diesel generators

Commonly used diesel generator set number is usually set to more than two, to ensure the continuity of power supply and adapt to changes in electricity load curve. The number of units in order to be based on changes in electricity load to determine the number of units into the generating units, so that diesel engines are often running under the economic load to reduce fuel consumption and reduce power generation costs. The best economic operating status of the diesel engine is between 75% and 90% of the rated power. In order to ensure the continuity of power supply, the common unit itself should consider setting up the standby unit, when the unit troubleshooting or downtime inspection, so that the generator is still able to meet the important power load uninterrupted continuous power supply.

3. Determination of the speed of commonly used diesel generator sets

In order to reduce wear and increase the service life of the unit, commonly used generator sets should be used to calibrate the speed of not more than 1000r / min in the low-speed unit, the standby unit can choose medium and high-speed unit. The same power plant units should use the same model, with the capacity of the unit, in order to use the same spare parts, easy maintenance and management. Load changes in the project, you can also use the same series of different capacity units.

Generator output calibration voltage to determine the same with the emergency generating units, generally 400V, individual electricity consumption, transmission distance of the project can choose high-voltage generating units.

Diesel generator error operation will seriously affect the life of diesel generating units, the following we come to understand in daily life, diesel generator sets of wrong mode of operation which?


Diesel generator error operation 1: Diesel engine running when oil is low

At this time due to insufficient supply of oil caused by the friction surface of the lack of fuel, resulting in abnormal wear or burns. To this end, before the start of diesel generators and diesel engine operation to ensure adequate oil to prevent the lack of oil caused by pull cylinder, burner failure.


Diesel generator error operation 2: stop with a load emergency stop or sudden unloading load immediately

 Diesel engine generator after the shutdown of the cooling system to stop the water, cooling capacity drastically reduced, the heat lost the cooling, easy to cause cylinder head, cylinder liner, cylinder block and other parts overheating, resulting in cracks, or excessive expansion of the piston stuck in the cylinder Inside. On the other hand, the diesel generator downtime without idling cooling, will make the friction surface oil shortage, when the diesel engine will start again due to poor lubrication and wear. Therefore, the diesel generator should be unloaded before the shutdown load, and gradually reduce the speed, no-load operation a few minutes.


Diesel generator error operation three: after the cold start is not warm up with load operation

Diesel generator cold start, due to oil viscosity, poor mobility, oil pump is insufficient, the friction surface of the machine due to lack of oil lubrication, resulting in abrupt wear, or even pull cylinder, burner and other failures. Therefore, after the start of the diesel engine cooling should be idle operation temperature, when the oil temperature reaches 40 ℃ or more when the load operation; machine starting should be linked to low speed, and in a row in each gear for a mileage until the oil temperature is normal, After, can be transferred to normal driving.


Diesel generator error operation four: diesel engine after the cold start throttle throttle

If the throttle thunder, the diesel generator speed increased sharply, will cause some of the friction on the machine due to dry friction and severe wear. In addition, the throttle when the piston, connecting rod and crankshaft force change, causing severe impact, easy to damage the parts.


Diesel generator error operation 5: In the case of insufficient cooling water or cooling water, oil temperature is too high to run

Diesel generator cooling water will reduce its cooling effect, the diesel engine due to lack of effective cooling and overheating; cooling water, oil oil temperature is too high, will cause the diesel engine overheating. At this point the diesel generator cylinder head, cylinder liner, piston components and valves and other major heat load, its mechanical properties such as strength, toughness and other sharp decline, so that parts deformation increases, reducing the gap between the parts, , Serious when there will be cracks, mechanical parts of the fault. Diesel generator overheating will also worsen the diesel engine combustion process, so that the injector work disorders, poor atomization, coke increased.