Haixing shares: Key points of operation of diesel generator sets

The diesel generator set is a power supply equipment composed of four major parts: diesel engine, cooling water tank, generator, chassis, control box, and fuel tank. Diesel generator sets are widely used in mines, railways, field construction sites, road traffic maintenance, power, factories, post offices, communities, buildings, schools, enterprises, hospitals and other departments as backup power sources. As an old power generation equipment manufacturer, Haixing Power has accumulated rich experience in diesel generator set operation, so I will share it with you below.

1. Diesel engine run-in

New or overhauled diesel engines must be run in 60 hours before they are officially used before they can be put into full load. To improve the working condition of the diesel engine moving parts, improve the reliability and service life of the diesel generator set of the diesel engine. The run-in plan should be considered depending on the use of the diesel engine and the towing method. In principle, the speed and load of the diesel engine should be gradually increased as the running-in time increases. During the entire running-in period, the load should be 50%-80% of the 12-h calibration power, and the speed should not be greater than 80% of the calibration speed. However, the operation time should not be too long at the beginning of the running-in or under too small loads.

Whenever the cylinder liner, piston, piston ring, connecting rod bearing and curved crook are replaced, short-term running-in will be carried out according to the above-mentioned running-in conditions.

2. Normal use of diesel

After the diesel generator set is put into normal use, it should always focus on the indicator values ​​of all instruments and observe the dynamics of the operation of the entire machine; it should frequently check the liquid level of the cooling system and various parts of the lubricating oil. If it is found that it does not meet the requirements or there is a leakage, it should be supplemented or the cause of inspection should be eliminated.

During operation, especially when the load is suddenly reduced, attention should be paid to prevent the sudden increase in the diesel engine speed (commonly known as a speed vehicle) from exceeding the specified value due to the failure of the speed controller. When such a situation occurs, emergency measures should be taken quickly and the cause should be found.

3. Matching of diesel engine and working machinery power

When choosing a diesel engine, users should not only consider the amount of power required by the matching working machinery, but also consider the load rate of the working machinery, such as intermittent use or continuous use. At the same time, the operating economy of the working machinery must be considered, that is, the working characteristics of the load and the characteristics of the diesel engine must be reasonably allocated. Therefore, the correct calibration of diesel engine power and the reasonable matching of diesel engine and working machinery are the prerequisites for ensuring the reliability, long life and economic operation of the diesel engine. Otherwise, the diesel engine may be overloaded and malfunctioned; or the load power is too small, and the power of the diesel engine cannot be fully utilized, which is uneconomical and causes problems such as oil leakage.

4. Use of diesel engines in plateau areas

The use of diesel engines in plateau areas is different from that in plain areas, which brings some changes in the performance and use of diesel engines. The following points are for reference by users who use diesel engines in plateau areas.

1) Due to the low air pressure in the plateau area, thin air and small oxygen content, especially for naturally aspirated diesel engines, the combustion conditions deteriorate due to insufficient intake, which prevents the diesel engine from emitting the original calibration power. Even if the basic structure of diesel engines is the same, the calibration power of each type of diesel engine is different, so their abilities on the plateau are different. For example, the 6135Q-1 diesel engine has a calibration power of 161.8kW/2200r/min. Due to the large calibration power and the small performance margin, the power will be reduced by about 12% for every 1000m increase in use on the plateau. Therefore, when the plateau is used for a long time, the fuel supply should be appropriately reduced according to the local altitude. Although the combustion process of the 6135K-11 diesel engine is the same, the calibration power is only 117.7kW/2200r/min, so it has sufficient margin in performance, so that the diesel engine itself has corresponding plateau working capacity.

Considering the tendency to delay ignition under plateau conditions, in order to improve the operating economy of diesel engines, it is generally recommended that the oil supply advance angle of naturally aspirated diesel engines should be appropriately advanced.

Due to the increase in altitude, the power is reduced and the exhaust temperature increases, users should also consider the plateau working capacity of the diesel engine when choosing a diesel engine to strictly avoid overload operation.

According to recent tests, for diesel engines used in plateau areas, exhaust gas turbocharger can be used as power compensation for plateaus. Exhaust gas turbocharger not only makes up for the lack of plateau power, but also improves smoke color, restores power performance and reduces fuel consumption.

2) As the altitude increases, the ambient temperature is also lower than that in plain areas. Generally, for every 1,000m increase, the ambient temperature drops by about 0.6℃. In addition, due to the thin plateau air, the starting performance of the diesel engine is worse than that in plain areas. When using it, users should take auxiliary starting measures corresponding to low-temperature starting.

3) Due to the increase in the altitude, the boiling point of water decreases, the wind pressure and cooling air quality of the cooling air decrease, and the heat increase per kilowatt per unit time, the cooling system's heat dissipation conditions are worse than those of the plains. Generally, open cooling cycles should not be used in high-altitude areas. Pressurized closed cooling systems can be used to increase the boiling point of the coolant during plateau use.

Only standardized diesel generator set operation can enable the equipment to achieve efficient power supply and achieve the desired effect. I hope everyone will list the training of diesel generator set operators as content and conduct regular training reviews and summary.