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What should be the normal temperature of each part of the diesel generator set during normal operation?

July 22, 2022
Diesel generator sets are not restricted by the use of site conditions can also provide continuous, stable and safe power, so in recent years by all walks of life as a backup and emergency power use, but due to various reasons caused by the phenomenon of power shortage in some areas, but also make the industries of power supply and the use of diesel generator sets and maintenance requirements are increasingly high, therefore, in order to ensure that the unit in the operation process can maintain a good Working condition, generator manufacturers require users to use diesel generator set must keep the unit in the most appropriate temperature range, the temperature is too high or too low will affect the normal operation of the unit.
A, the normal temperature of the components of diesel generators
1, water-cooled diesel generators to maintain normal work, the temperature of the cooling water should be between 353K ~ 363K (80 ° C ~ 90 ° C). At this time, the cylinder wall temperature does not exceed 473K~573K (200°C~300°C); cylinder head, the temperature of the top of the piston does not exceed 573K~673K (300°C~400°C); the temperature of lubricating oil is 343K~363K (70°C~90°C), at this time can ensure that the unit has better power, economy and purification, so that the movement of parts and wear normal.
2, air-cooled engine aluminum cylinder wall temperature allowed for 423K ~ 453K (150°C ~ 180°C), aluminum cylinder head is 433K ~ 473K (160°C ~ 200°C).
Second, the hazards of diesel generators overheating
Diesel generator overheating means that the temperature of the engine cooling system is too high. Engine temperature is too high for many reasons, high temperature after the damage to the engine is also a lot.
1, the intake efficiency is reduced, resulting in a drop in engine power.
2, the tendency of early combustion and deflagration increases, which destroys the normal work of the engine, but also prompted the parts to bear additional shock load and cause early damage.
3, the normal clearance between the moving parts is destroyed, so that the parts can not move normally, or even damage.
4, the mechanical properties of metal materials to reduce the deformation of parts and damage.
5, the lubrication situation deteriorates, intensifying the friction and wear of the parts. Engine cooling, if simply rely on the external heat dissipation of the parts themselves is not enough, must be some parts, especially the parts in direct contact with high-temperature gas for the necessary forced cooling, in order to ensure normal engine operation. However, excessive cooling will also cause adverse consequences.
Third, the hazards of diesel generators too cold
Into the cylinder mixture (or air) temperature is too low, poor quality combustible mixture, resulting in a drop in engine power, increased fuel consumption; combustion products in the water vapor easily condensed into water, intensifying the erosion of the body and parts. The unvaporized fuel washes and dilutes the oil film on the surface of the parts (cylinder wall, piston, piston ring, etc.). This aggravates the wear of the parts.
1, the combustible mixture into the cylinder (or air) temperature is too low, making ignition difficult or slow combustion, resulting in a drop in engine power and increased fuel consumption.
2, the viscosity of the lubricant increases, resulting in poor lubrication, intensifying the wear and tear of the parts, while increasing the power consumption.
3、The water vapor in the combustion products is easy to condense into water and acid gas to form acid, which aggravates the corrosion effect on the parts, especially the cylinder wall.
4, because the temperature is too low and not vaporized fuel on the friction surface (cylinder wall, piston, piston ring, etc.) on the oil film erosion and dilution of lubricating oil, increasing the wear on the parts.
Diesel generator set in the work of each component has a corresponding appropriate temperature, and the role of the cooling system is to ensure that the diesel generator in any working conditions can be maintained in the appropriate temperature range, the cooling system to prevent the engine overheating, but also to prevent the engine in winter too cold. After the engine cold start, the cooling system also ensures that the engine warms up quickly and reaches the normal working temperature as soon as possible.