The damage caused to the unit by low water temperature during operation of the diesel generator set is as follows:
1. Low temperature will worsen the combustion conditions of diesel in the cylinder, poor fuel atomization, increase the combustion period after ignition, and make the engine easy to operate. Rough use will worsen damage to crankshaft bearings, piston rings and other components, reduce power and reduce economy.
2. Water vapor after combustion easily condenses on the cylinder wall, causing metal corrosion.
3. Burning diesel can dilute engine oil and worsen lubrication conditions.
4. The colloid forms due to incomplete combustion of the fuel, causing the piston ring to become stuck in the piston ring groove, the valve to become stuck, and the pressure in it to decrease.the cylinder at the end of compression. .
5. If the water temperature is too low, the engine oil temperature will also be low. The engine oil will become thicker and the fluidity will become poor. The oil pump will have less oil, resulting in insufficient oil. the oil supply to the generator. In addition, the crankshaft bearing clearance will become smaller and lubrication will be poor. Many operators do not want diesel generators to operate at operating speeds. They believe that lower speeds will not cause a breakdown. In fact, too low a speed will also cause bad consequences, as follows:
1) Too low a speed will reduce the power output of the diesel engine and reduce its power;
2 ) Too low rotation speed will cause the working speed of each component to decrease, which will deteriorate the working performance of thecomponents, will reduce the output pressure of the oil pump, etc. ;
3) Reduce the reserve power of the diesel engine, which must be in normal operation. The diesel engine is under full load or overload.
4) If the speed is too low, the speed of the engine working machines; the linkage mechanism will also be reduced, which will reduce the mechanical performance of the work, such as reducing the water flow of the water pump and reducing the number of water pumps, elevator, etc.
Marine Diesel Generator
Diesel generators will not explode, but a cylinder explosion will occur. Here are the causes of cylinder explosion and how to avoid them:
1. Use the pressure reducer to shut down, causing the high temperature cylinder head to suddenly encounter cold air and cause cracks.
2. After shutdown, the cooling water was not discharged. The water present in the machine willturns into ice and increases in volume, causing the cylinder block and cylinder head to burst.
3. The generator runs for a long time and the temperature inside the generator is high. Drain high temperature water immediately after parking. High temperature parts are likely to crack when suddenly encountering cold air.
4. When the generator set is running, there is a lack of cooling water or the water tank boiler temperature is too high and cooling water is suddenly added. Overcooling and shortening of the cylinder block and cylinder head can also lead to cracking.
5. Add cooling water after start-up. After starting the diesel engine, the temperature inside the diesel generator increases immediately. If cooling water is added at this time, the cylinder block and cylinder heade will cool quickly, causing cold shrinkage cracking.
Methods for diesel generators to prevent cracking of various cylinder blocks and cylinder heads:
1. When the generator is overheated and severely short of water, the diesel engine must idle. low speed for 10 to 15 minutes. Then gradually add cooling water
2. Before starting the diesel engine, warm water should be added to the water tank. In harsh winter, the hot water should be refilled 2-3 times until the water tank is filled with hot water. The water flowing out of the drain tap is around 30 to 50°C. Better start.3. When the diesel engine runs for a long time, you should wait about half an hour after stopping, and then drain the cooling water when the engine temperature drops to 40~50℃. After draining the water, it is best to use a wireend to pierce the drain valve switch to prevent sediment from blocking the drain valve.
Is water added to the cooling holes of the diesel generator compressor?
Generally speaking, the diesel generator and main engine use fresh water to cool the body, cylinder liners and cylinder head. Freshwater is a closed-loop system that then uses seawater to cool the freshwater.
If sea water is used for direct cooling, it will cause engine corrosion. Sea water is too corrosive.
Heat exchangers used to cool fresh water from sea water are usually made of copper and are resistant to corrosion.
1. Do not add water during operation
You should know that it is not recommended to add water during operation of the diesel generator after starting the engine, because there in a. Nocooling water in the body, the various parts of the engine will increase rapidly, especially the water jacket outside the cylinder head and the injector of the diesel engine. If cooling water is added at this time, the cylinder head and water jacket will heat up easily. crack or warp due to sudden cooling. 2. Precautions when adding water during shutdown (1) Heating water in winter. During the cold winter, it is difficult to start the generator. If cold water is added before starting, it is easy to freeze in the lower chamber of the water tank and in the water inlet pipe during the water filling process or when the water is added but fails to start. be started in time, preventing water from circulating, it may even cause the water tank to burst. Adding hot water can, on the one hand, increase the engine temperature (2) Add clean, soft water. Afterhaving filled the water tank with antifreeze, if you notice that the liquid level in the water tank has dropped, simply add clean, soft water (distilled water is better ) assuming that there is no leak, because the boiling point of commonly used ethylene glycol antifreeze is high, what evaporates is the water contained in antifreeze, it is not necessary to replenish the antifreeze but only fresh water. It’s worth mentioning: never add unsoftened hard water. (3) Fresh water selection. Fresh water generally includes rain water, snow water, river water, etc. This water contains few minerals and is suitable for engine use. The added water must be clean. Impurities in the water will block the water channels and worsen the wear of the water pump impeller and other components. If hard water is used, it must be softened first. The metSoftening methods generally include heating and the addition of lye (usually caustic soda).