Diesel generator set new machine running-in points

1. Preheat the diesel engine After starting the diesel engine, the no-load operation time should not exceed 5min, and pay close attention to the anti-governance pressure gauge. When the indicated oil pressure is greater than 0.05MPa (0.5kgf/cm2), the engine speed can be gradually increased to 1000- 1200r/min, then enter part load operation. When the temperature of the water outlet of the diesel engine is higher than 75°C, the oil temperature is higher than 50°C, and the oil pressure is higher than 0.25MPa (2.5kgf/cm2), it is allowed to enter the full load operation.
Note: After starting at low temperature, the increase of speed should be as slow as possible to ensure that the bearing has sufficient lubrication and the oil pressure is stable. 3
2. The running-in of the diesel engine The new or overhauled diesel engine must be operated for 60 hours before being put into use before it can be put into full-load operation. To improve the working status of diesel engine's moving parts, improve the reliability of diesel engine operation and life. During the running-in period of the diesel engine, the load is preferably 50-80%, and the rotation speed should not be greater than 80% of the rated rotation speed. However, the running time during the start-up phase of the running-in or the under-load condition should not be too long.
Whenever cylinder liners, pistons, piston rings, connecting rod bushings and crankshafts are replaced, short-term running-in should also be carried out according to the above-mentioned wear conditions.
3. Matching diesel engine and work machine power When selecting the diesel engine, the user should not only consider the calibrated power used by the work machine, but also must consider the load factor of the work machine, such as intermittent use, continuous use and its load. the size of. If you want to consider the operating economy of the machine, you should also consider the reasonable matching of the load operating characteristics and diesel engine characteristics. Therefore, a reasonable calibration of the diesel engine power and a reasonable match between the diesel engine and the work machine are the preconditions for ensuring the reliable, long-life, and economical operation of the diesel engine. Otherwise, the diesel engine may be overloaded and generate unnecessary faults; or the load power is too small. Power can not be fully used, so it is not economical and prone to defects such as engine oil.
4. The use of diesel engines in the plateau area The use of diesel engines in the plateau area is different from that in the plain areas, which brings about changes in the performance and use of diesel engines. The following points are for users of diesel engines in highland areas.
1. Due to the low atmospheric pressure, thin air, low oxygen content, and low ambient temperature in the highland area, especially for naturally-intake diesel engines, the combustion conditions deteriorate due to insufficient intake air, so that the diesel engine cannot issue the specified calibration power. . Even though the basic structure of the diesel engine is the same, the calibration power, displacement, and speed of each type of diesel engine are different, so their ability to work in the plateau is not the same. When used at the plateau, the power non-supercharger is reduced by about 6-10% and the booster is increased by about 2-5% for every 1000m. Therefore, when the plateau is used for a long time, the amount of oil should be appropriately reduced according to the local altitude. . At the same time, since the air pressure is low, the boiling point of the cooling water is reduced, and in the absence of other measures, the power usage must be reduced.
Taking into account the propensity to delay ignition in plateau conditions, in order to improve the operating economy of diesel engines, it is generally recommended that the advancement angle of fuel supply for non-supercharged diesel engines be properly advanced.
As the altitude rises, the power declines, and the exhaust temperature rises. Therefore, when selecting a diesel engine, the user should also consider the diesel engine's plateau operation capability and strictly avoid overload operation.
For diesel engines used in the plateau area, exhaust gas turbocharging can be used as power compensation for the plateau. Exhaust gas turbocharging not only compensates for the lack of plateau power, but also improves smoke, restores power performance, and reduces fuel consumption.
2. As the altitude increases, the ambient temperature is lower than that in the plains. Generally, for each 1000m rise, the ambient temperature will drop by about 6°C. Since the altitude is thin, the starting performance of the diesel engine is higher than that of the plain area. difference. When the user is using it, the auxiliary starting measures corresponding to the bottom temperature start should be taken.
3. As the altitude rises, the boiling point of water decreases, the air pressure of the cooling air and the cooling air quality decrease, and the heat dissipation per unit of time per kilowatt increases, so the cooling conditions of the cooling system are worse than that of the plain. It is generally not advisable to use open cooling cycles at high altitudes. A pressurized closed cooling system can be used to increase the boiling point of the cooling fluid when used at altitude.
Fourth, the parking of diesel engines
Normal parking
1, before parking, first remove the load, then adjust the governor joystick, gradually reduce the speed to about 750r/min, run 3-5min after the parking handle parking; as far as possible not to be in the full load state soon Stop the diesel engine to prevent accidents such as overheating.
2. For a 12-cylinder V-type diesel engine, turn the electric key from “left” to “middle” position after parking to prevent battery current from flowing backwards. When it is necessary to park in a cold area, immediately after parking, open the drain valve on the side of the body, fresh water pump, oil cooler (or cooling water pipe), radiator, etc., and drain the cooling water to prevent freezing. If it is cooled with antifreeze, it is not necessary to open the drain valve.
3. For diesel engines that need to be stored for a long time, when the vehicle is parked for the next time, the original engine oil should be drained, sealed oil should be used, and then stored for about 2 minutes. If antifreeze coolant is used, it should also be released.