Engine fuel: low temperature in winter tends to increase the viscosity of diesel oil, resulting in poor fluidity, difficult diesel oil spraying, poor atomization, and even worse combustion, reducing the power and economic performance of diesel engines. Therefore, light diesel oil with low condensation point and good fire performance should be selected in winter. The condensing point of diesel engine shall be 7-10 ℃ lower than the temperature in local seasons.
Start with open flame: In places where the temperature is too low, the machine can be started with open flame, but the air filter cannot be removed. Use cotton yarn dipped in diesel oil to ignite, make it into ignition material, and put it into the intake pipe for combustion startup. In this way, during the starting process, the external dust air will be directly sucked into the cylinder without filtering, which will lead to abnormal wear of the piston, cylinder and other components, and will also lead to rough operation of the diesel engine and damage to the machine.
Premature discharge or no discharge of cooling water: the generator runs at idle speed before shutdown, the temperature of cooling water drops below 60 ℃, the water is not hot, and then the engine is shut down to discharge water. If the cooling water is released too early, when the temperature is high, the body will be suddenly attacked by cold air, resulting in shrinkage and cracks. When draining water, the residual water in the body shall be drained to avoid freezing and expansion, which may cause expansion and cracking in the body. Shunjinxing recommends users to use antifreeze in any season. The more antifreeze is used for silent generator sets. As the antifreeze not only plays a cooling role, but also has the role of protecting the diesel engine.
Selection of lubricating oil: low freezing point oil shall be selected in winter, and external bath heating method can be used to improve oil temperature during startup. It is not recommended to use an open flame to avoid deterioration of the oil in the oil pan, or even scorching, which will reduce or completely lose the lubricating performance and thus aggravate the wear of the machine.
Startup method: In winter, if conditions permit, assemble a jacket heater for the silent generator to keep the machine warm and easy to operate at any time. In order to quickly start the silent generator set, some operators often adopt the abnormal starting method of no water starting (starting first, then adding cooling water). This practice will cause serious damage to the machine and should not be used. The correct preheating method is to cover the insulation quilt on the water tank, open the drain valve, continuously inject 60-70 ℃ clean soft water, touch the water flowing out of the drain valve with your hand, then close the drain valve, and then start.
Precautions for low temperature on load: After the silent generator set catches fire, some operators can’t wait to start load operation immediately. Shortly after the diesel engine catches fire, due to the low temperature and high oil viscosity, the oil is not easy to fill into the moving friction surface, which will cause serious wear of the machine. In addition, plunger spring, valve spring and injector spring are also easy to break due to cold brittleness. Therefore, after the silent generator set starts up and catches fire in winter, it should idle at low and medium speed for a few minutes, wait until the temperature of cooling water reaches 60 ℃, and then put it into load operation.
Post time: Oct-26-2022