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Precautions for Using Diesel Generator Set at Low Temperature

Jul. 05, 2022

Today, we will briefly introduce the precautions for using diesel generator sets in low temperature environments.

Drain the water too early or do not release the cooling water: the diesel generator runs at an idle speed before turning off the flame, and when the temperature of the cooling water drops below 60°C and the water is not hot, turn off the flame and drain the water. If the cooling water is released prematurely, the body will suddenly shrink and cracks will appear when the body is suddenly attacked by cold air when the temperature is high. When the temperature is lower than -4℃, the cooling water in the cooling water tank of the diesel engine must be discharged, because the freezing volume of the water will increase at -4℃, and the radiator of the cooling water tank will be damaged due to the expansion of the volume.

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Choose the fuel oil casually: the low temperature in winter makes the fluidity of diesel worse, the viscosity increases, and it is not easy to spray, resulting in poor atomization and deterioration of combustion, resulting in a decline in the power and economic performance of the diesel engine. Therefore, when choosing oil at low temperature, you should try to choose light diesel oil with thinner viscosity, low freezing point and good ignition performance. It is generally required that the freezing point of the diesel engine should be 7-10 ℃ lower than the local current seasonal temperature.

Start with an open flame: the air filter cannot be removed, use cotton yarn dipped in diesel to ignite, and then make a kindling material and place it in the intake pipe to start the combustion. In this way, during the starting process, the dust-laden air from the outside will be directly sucked into the cylinder without being filtered, causing abnormal wear of pistons, cylinders and other parts, and will also cause the diesel engine to work rough and damage the machine. Therefore, in low temperature conditions, it is necessary to replace the air filter frequently.

Improper start-up method: In order to quickly start the diesel engine in a low temperature environment, some staff often use the abnormal start-up method of waterless start (start first, then add cooling water). This practice can cause serious damage to the machine and should be prohibited. The correct preheating method is: first cover the thermal insulation quilt on the water tank, open the water valve, and continuously inject clean soft water of 60-70 °C into the water tank. Pour clean soft water at 90-100°C into the water tank, and shake the crankshaft so that all moving parts are properly pre-lubricated, and then start again.

Low temperature load operation: After the diesel generator set starts to catch fire, some workers can't wait to put it into load operation immediately. In a diesel engine that has been on fire soon, due to the low temperature of the body and the high viscosity of the oil, the oil is not easy to be filled into the friction surface of the moving pair, which will cause serious wear and tear of the machine. In addition, plunger springs, valve springs and injector springs are also prone to breakage due to "cold brittleness". Therefore, after the diesel engine starts to catch fire when the temperature is low, it should be idling at low and medium speed for a few minutes, and then put into load operation when the cooling water temperature reaches 60 °C.

Don't pay attention to the heat preservation of the body: when the temperature is low, it is easy to over-cool the diesel generator set when it is working. Therefore, heat preservation is the key to good use of diesel engines in low temperature environments, so all diesel engines in use should be equipped with cold protection equipment such as heat preservation jackets and heat preservation curtains. Pay attention to the above points, you can effectively improve the service life of the diesel generator set and prolong the service time.

Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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