Guides to Use Diesel Generator Set In Plateau Areas and High Altitude

Due to the low air pressure in the plateau region, the air is thin and the oxygen content is small. Especially for naturally aspirated diesel generator sets, the combustion conditions are deteriorated due to insufficient intake air, so that the diesel generator set cannot emit the original specified calibration power even. The basic structure of diesel generator sets is the same, but the diesel generator sets have different calibration powers, so their ability to work in the plateau is different. The following are the considerations for the use of diesel generator sets in the highlands.

For example, the 6135Q-1 diesel engine has a rated power of 161.8KW/2200r/min. Due to the large calibration power and small performance margin, the power is reduced by about 12% for every 1000m increase in the plateau. Therefore, When the plateau is used for a long time, the oil supply should be appropriately reduced according to the local altitude. The 6135K-11 diesel engine, although the combustion process is the same, but because the calibration power is 117.7KW/2200r/min, the performance has sufficient margin, so the diesel engine itself has a certain plateau working capacity.

Considering the tendency of fire retardation under high altitude conditions, in order to improve the economical operation of diesel generator sets, it is generally recommended that the fuel injection advance angle of naturally aspirated diesel engines should be appropriately advanced. As the altitude increases, the power is reduced, and the exhaust temperature rises. Therefore, users should also consider the high-altitude working ability of the diesel engine when selecting the diesel generator set, and strictly avoid overload operation. According to years of experiments, the diesel generator set used in the plateau can be used as the power compensation of the plateau by the method of exhaust gas turbocharging. Exhaust gas turbocharging not only compensates for the lack of plateau power, but also improves smoke color, restores power performance and reduces fuel consumption.

With the increase of altitude, the ambient temperature is lower than that in the plain area. Generally, for every 1000m increase, the ambient temperature will decrease by about 0.6°C. In addition, due to the thin air in the plateau, the starting performance of the diesel generator set is better than that in the plain area. difference. When using the user, the auxiliary starting measures corresponding to the low temperature start should be taken.

As the altitude increases, the boiling point of the water decreases, while the wind pressure and cooling air quality of the cooling air decrease, and the amount of heat dissipation per kW per unit time increases, so the cooling system has a lower heat dissipation condition than the plain. It is generally not advisable to use an open cooling cycle at high altitudes. A pressurized closed cooling system can be used to increase the boiling point of the coolant during high altitude use.

What should be paid attention to when starting a generator set in a cold climate?

Glow plug preheating (user-owned)

The glow plug system supplies heat to the cylinder so that the compression temperature is sufficient to ignite the fuel.

To help start the engine when the temperature is 10 ° C or lower, an intake air preheater can be used. The preheating device includes a switch that turns the glow plug circuit on, and the glow plug is energized by the battery. Fuel is burned in the intake manifold to heat the inhaled air.

Note: Steam can not be used in conjunction with the preheater to help start the fire. This will result in a fire.

The steps to use the preheater during cold start are as follows:

1. Adjust the throttle to the idle position. Turn the glow plug toggle switch to the "ON" position. The red indicator light should be on.

2. After the red indicator light is on for 20 seconds, start the engine. As soon as the engine turns, the preheater hand pump is turned on to maintain the fuel pressure of 552~689 kPa. If the hand pump is used 20 seconds ago, the glow plug will be wetted to prevent heating.

3. If the engine does not start within 30 seconds, stop turning the engine. Wait a minute or two to start again.

4. After the engine is started, slowly pump the hand pump to keep the engine running at a steady speed. In cold climates, it takes 4 to 5 minutes or more. Do not accelerate the engine.

5. When the engine is hot, stop pumping oil when the hand pump does not vibrate during the oiling stroke. Close and lock the hand pump. Turn off the glow plug toggle switch (red LED is off).

6. If the engine shows no signs of starting during the three full strokes of the preheater pump head, test the intake manifold for heat. If not hot, check the circuit and glow plug.

Note: The preheater hand pump, switch and resistor are located on the instrument panel and should be checked during engine starting.

Flame preheater (user-owned)

At 0 °C to -40 °C ambient temperature, the system automatically starts to work according to the engine coolant temperature signal and the battery voltage signal measured by the water temperature sensor, so that the surface of the glow plug heating element quickly reaches the ignition temperature of 850 to 950 °C. The driver can operate the key switch according to the indicator signal. When the engine is running under the driving motor drag, the solenoid valve automatically opens the oil circuit to supply oil to the hot flame preheating plug, and generates an injection flame to heat the intake air in the intake pipe to assist the diesel engine to start in a short time. After the specified working procedure is completed, the electronic controller automatically cuts off the power and stops working.

Note: The ether assist starter cannot be used in conjunction with a flame preheater or glow plug, which can result in a fire.

Recommended starting method when using Fleetguard auxiliary starting device

1. Adjust the throttle to the idle position.

2. Separate the drive or set the transmission to the neutral position.

3. Open the manual fuel cut-off valve or electric fuel cut-off valve.

4. The starter is actuated to supply an appropriate amount of starter fluid as the engine rotates until the engine is idling smoothly.

Use starter fluid without metering equipment

1. When one starts the engine, the other person sprays the starting liquid into the air cleaner.

Note: Do not allow the starter fluid to get close to the open flame. Do not use it with a preheater or flame spray equipment. Do not inhale the starter fumes. Excessive fluid will cause excessive pressure and cause knocking or overspeeding the engine.

2. The starter liquid fumes are drawn into the intake manifold of the engine and the engine should be started without difficulty.

Note: Starter fluids or volatile fuel oils must not be used in underground mines or tunnel operations. If the engine is equipped with such equipment, ask the local mine bureau inspector whether it can be used as a starting aid.