Haixing shares: operating points of diesel generator set

Diesel generator set is a power supply equipment composed of four parts: diesel engine, cooling water tank, generator, chassis, control box and fuel tank. Diesel generator sets are widely used in mining, railways, field construction sites, road traffic maintenance, electric power, factories, post offices, communities, buildings, schools, enterprises, hospitals and other departments because of their small size, flexibility, lightness, complete supporting facilities, and easy operation and maintenance. , as a backup power supply. As a long-established power generation equipment manufacturer, Haixing Power has accumulated rich experience in operating diesel generator sets, which we will share with you below.

1. Diesel engine running-in

New or overhauled diesel engines must be run in for 60 hours before being put into full load use. To improve the working condition of the moving parts of the diesel engine and improve the reliability and service life of the diesel engine. Running-in should consider the specific running-in plan depending on the purpose 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 12h calibrated power, and the speed should not be greater than 80% of the calibrated speed. However, in the initial stage of running-in, the running time under idle operation or too small load should not be too long.

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

2. Normal use of diesel

Diesel generator setAfter being put into normal use, you should always pay attention to the indication values ​​of all instruments and observe the dynamics of the entire machine operation; you should always check the cooling system and the lubricating oil level of each part. If any non-compliance with the specified requirements or leakage is found, immediate action should be taken. Supplement or check the reasons to eliminate them.

During operation, especially when the load is suddenly reduced, care should be taken to prevent the diesel engine speed from suddenly increasing beyond the specified value due to governor failure (commonly known as speeding). When such a situation occurs, emergency measures should be taken quickly and then checked again. Clear the reason.

3. Matching the power of diesel engine and working machinery

When selecting a diesel engine, users should not only consider the power required by the matching working machinery, but also the load rate of the working machinery, such as whether it is used intermittently or continuously. At the same time, the operating economy of the working machinery must be considered, that is, the operating characteristics of the load and the characteristics of the diesel engine must be reasonably distributed. Therefore, the correct calibration of the diesel engine power and the reasonable matching of the characteristics of the diesel engine and the working machinery are the prerequisites to ensure the reliability, long life and economical operation of the diesel engine. Otherwise, the diesel engine may be overloaded and malfunctioned; or the load power is too small and the diesel engine power cannot be If it is fully used, it will be uneconomical and cause 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, the air is thin and has low oxygen content. Especially for naturally aspirated diesel engines, the combustion conditions deteriorate due to insufficient air intake, so that the diesel engine cannot produce the originally specified calibrated power. Even though the basic structure of the diesel engines is the same, the calibrated power of each type of diesel engine is different, so their capabilities on the plateau are different. For example, the 6135Q-1 diesel engine has a calibrated power of 161.8kW/2200r/min. Since the calibrated power is large and the performance margin is very small, when used on a plateau, the power will be reduced by about 12% for every 1000m of elevation. Therefore, when used on a plateau, When used on a plateau 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 calibrated power is only 117.7kW/2200r/min, so there is sufficient margin in performance, so that the diesel engine itself has the corresponding plateau working capability.

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

As the altitude increases, the power performance decreases and the exhaust temperature increases. Therefore, users should also consider the plateau working capability of the diesel engine when selecting a diesel engine, and strictly avoid overload operation.

According to test results in recent years, for diesel engines used in plateau areas, exhaust gas turbocharging can be used as power compensation for plateaus. Exhaust gas turbocharging can not only make up for the lack of plateau power, but also improve smoke color, restore power performance and reduce fuel consumption.

2) As the altitude increases, the ambient temperature is lower than that in plain areas. Generally, for every 1000m of increase, the ambient temperature drops by about 0.6°C. In addition, because the air on the plateau is thin, the starting performance of the diesel engine is better than that in plain areas. Difference. When using, the user should take auxiliary starting measures corresponding to low temperature starting.

3) As the altitude increases, the boiling point of water decreases, the wind pressure and cooling air quality of the cooling air decrease, and the heat per kilowatt per unit time increases, so the heat dissipation conditions of the cooling system are worse than in the plains. Generally, it is not suitable to use an open cooling cycle in high altitude areas. A pressurized closed cooling system can be used to increase the boiling point of the coolant when used on plateaus.

Only through standardized diesel generator operation can the equipment achieve efficient power supply and exert its due effect. I hope that everyone will include the training of diesel generator operators as part of their content, and conduct regular training reviews and summaries.