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Influence of Low Load of Diesel Generator Set

Dec. 02, 2022

As many parts of the diesel generator set adopt the form of pressure seal, such as the cylinder liner piston piston ring space and the supercharger supercharger rotor shaft space, this kind of seal generally plays a full role when the engine has about 1/3 load. If the diesel generator set is operated under a small load, the following faults will occur as the operation time continues:


standby generator set


1. The piston cylinder liner seal is not good, the engine oil goes up, enters the combustion chamber for combustion, and the exhaust gas emits blue smoke.


2. For supercharged diesel generator set, the boost pressure is low due to low load and no load. It is easy to reduce the sealing effect of the turbocharger oil seal (non-contact type), and the oil enters the plenum chamber and the cylinder with the intake air.


3. Part of the engine oil flowing up to the cylinder is involved in combustion, while part of the engine oil cannot be completely burned. Carbon deposits are formed at the valve, intake duct, piston crown, piston ring, etc., and part of the engine oil is discharged with the exhaust. In this way, oil and carbon will gradually accumulate in the exhaust passage of the cylinder liner.


4. If the oil in the supercharger chamber accumulates to a certain extent, it will leak out from the junction surface of the supercharger.


5. Long term low load operation will lead to more serious wear of moving parts, deterioration of engine combustion environment and other consequences leading to early overhaul period.


To sum up, it is not easy to solve the problems of exhaust, carbon deposition and leakage caused by long-term low load use of diesel generator sets. It is emphasized that low load or no-load operation time should be reduced as much as possible, and the minimum load should not be less than 25% - 30% of the rated power of the unit, so as to reduce the problems caused by low load. I hope you can apply what you have learned.


Jiangsu Starlight Power Generation Equipment Co., Ltd. was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. The company has a registered capital of 218.88 million yuan. The company covers an area of 86,000 square meters and a building area of 55,000 square meters. There are more than 660 employees, including 456 professional technicians and 106 senior technicians. It has 46 sales and service outlets nationwide. The main products are diesel engines, generator sets, and diesel generators, providing users with a one-stop service of design, supply, debugging and maintenance at any time. Starlight has always insisted on using first-class talents, building first-class enterprises, manufacturing first-class products, creating first-class services, and making every effort to build a first-class domestic enterprise. If any question please feel free to visit our website https://www.dieselgeneratortech.com/ or send email to sales@dieselgeneratortech.com.

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