The running in of diesel generator set and its use in highland area

Running in of 1. diesel engine

A new or overhauled diesel engine must be run through the 60H before it is officially used, so it can be put into full load. In order to improve the working condition of diesel locomotive moving parts, to improve the operation reliability and service life of diesel engine. The running in should be based on the difference between the diesel engine's use and the load taking mode. In principle, with the increase of running time, the speed and load of diesel engine will be gradually improved. In the whole running period, the load should be 50%-80% with 12h calibration power, and the speed should be no more than 80% of the calibration speed. But at the beginning of the operation, the operation time of air transfer or small load should not be too long. When the cylinder liner, piston, piston ring, connecting rod, Bush and crank are replaced, the running in should be properly carried out according to the running in conditions.

2. normal use of diesel oil

The diesel engine should be put into normal use, often watching all instruments and dynamic observation of machine operation; the liquid level should always check the cooling system and the lubrication oil, if found inconsistent requirements or leaking, should be given to supplement or check the reason to be excluded. In the process of operation, especially when the dynamic load, should pay attention to prevent failure the engine speed governor suddenly increased (commonly known as speed) exceeds the specified value, when such a situation should take emergency measures quickly, and then find out the reason.

Matching of 3. diesel engine to working mechanical power

When choosing a diesel engine, the user should consider not only the power required to work with the machine, but also the load rate of the working machinery, such as intermittent use or continuous use. At the same time, it is necessary to consider the operation economy of the working machinery, that is, the working characteristics of the load and the characteristics of the diesel engine must be properly allocated. Therefore, reasonable matching of diesel engine power and the correct calibration of diesel engine and mechanical properties of the work is to ensure the engine reliability and long life and economic operation of the premise, otherwise it may make the machine overload operation and failure of unnecessary diesel; or the load power is too small, the power of the diesel engine can not be fully used, so that is not the economy and channeling oil ills.

Application of 4. diesel engine in plateau area

The use of diesel engines in the plateau is different from that in the plain areas, and presents some changes in the performance and use of the diesel engines. The following points are for reference to the users of the diesel engine in the plateau area.

1) due to the low pressure in the plateau area, the air is thin and the oxygen content is small, especially for the naturally aspirated diesel engine, the combustion condition becomes worse due to insufficient intake gas, so that the original calibration power can not be issued by the diesel engine. Even though the basic structure of diesel engine is the same, the calibration power of different diesel engines is different, so their ability in plateau is different. For example, 6135Q-1 diesel engine, rated power is 161.8kW/2200r/min, the rated power, the performance margin is very small, in the plateau when used for every 1000m increase of power decreased about 12%, so the long-term use in the plateau should be based on the local altitude, appropriate to reduce the amount of oil. While 6135K-11 diesel engine, although the combustion process is the same, but because the calibration power is only 117.7kW/2200r/min, so the performance has sufficient margin, so that the diesel engine itself has a certain plateau capacity. In order to improve the running economy of diesel engine, it is generally recommended that the fuel injection timing of naturally aspirated diesel engine should be appropriately advanced. Due to the increase of the sea level, the decrease of power and the increase of the exhaust temperature, the user's ability to work on the plateau should be taken into consideration when the diesel engine is selected, so as to avoid overload operation.

According to the test in recent years, the method of exhaust turbocharging can be used as the power compensation of the plateau diesel engine. The lack of turbocharger can not only compensate for the plateau power, can also improve the smoke and restore power performance and reduce fuel consumption.

2) with increasing altitude, ambient temperature than the plain area to low, generally every 1000m increase of ambient temperature decreased about 0.6 degrees Celsius, and due to high altitude thin air, therefore, the starting performance of the diesel engine than the plain area. When users are using, they should adopt the auxiliary starting measures corresponding to the low temperature starting.

3) because of high altitude, the boiling point of water is reduced, and the cooling air pressure and cooling air quality is reduced, and the heat per kilowatt per unit time increased, so the heat dissipation condition of cooling system than plain difference. Generally, the open cooling cycle is not suitable for the high altitude area, and the closed cooling system can be adopted to improve the boiling point of the cooling liquid used in the plateau.