How Does The Diesel Generator Set Work?

The diesel generator set is a kind of power generation equipment with diesel as the main fuel. The 6135AZD-1 water cooled electric starting diesel engine is used as the motive power to drive the generator (ie, electric ball) to generate electricity and convert the kinetic energy into electrical energy and thermal energy. The whole diesel generator set is mainly divided into three parts: diesel engine, generator (ie electric ball), and controller. Next we mainly introduce the nominal power and working principle of diesel generator sets.

1. Nominal Power of the Diesel Generator

The diesel generator set is composed of a diesel engine and a synchronous alternator. The maximum allowable power of the KP206 6 cylinder electric starting diesel engine is limited by the mechanical load and thermal load of the parts. Therefore, the maximum power allowed for continuous operation is called the nominal power.

The 6 cylinder high speed electric starting diesel engine cannot be used beyond the nominal power, otherwise it will shorten its service life and may even cause an accident. According to national standards, the nominal power on the nameplate of diesel engines is divided into the following four categories.

1) 15min power: the maximum power that the new stationary 227kw electric starting diesel engine is allowed to run for 15min. In a short period of time, it may be overloaded and require nominal power with acceleration performance, such as the nominal power of cars and motorcycles.

2) 1h power: the maximum effective power that the 660kw high speed electric starting diesel engine is allowed to continue to run for 1h, The nominal power of diesel engines such as wheel tractors, locomotives, ships, etc.

3) 12h power: the maximum effective power that the diesel engine is allowed to run for 12h, which is the nominal power we often say. For example, the nominal power of diesel engines for power station units and engineering machinery.

4) Continuous power: the maximum power that the diesel engine is allowed to run for a long time.

2. Working principle of the Diesel Generator

The diesel engine drives the generator to turn the diesel energy into electrical energy.

In the cylinder of the diesel engine, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel fuel sprayed from the fuel injection nozzle. Under the upward squeezing of the piston, the volume shrinks and the temperature rises rapidly, reaching the diesel ignition point. Then the diesel is ignited, the mixed gas burns violently, the volume expands rapidly, pushing the piston down, which is called ‘work’. Each cylinder works sequentially in a certain order, and the thrust acting on the piston becomes a force that pushes the crankshaft through the connecting rod, thereby driving the crankshaft to rotate.

By installing the brushless synchronous alternator coaxially with the crankshaft of the diesel engine, you can use the rotation of the diesel engine to drive the rotor of the generator. Using the principle of 'electromagnetic induction', the generator will output an induced electromotive force, and a closed load loop can generate current .

Diesel generator set is a type of self-provided power station- AC power supply equipment. It is a small independent power generation equipment that uses an internal combustion engine as a power source to drive a synchronous alternator to generate electricity.

The modern diesel generator set consists of a diesel engine, a three-phase AC brushless synchronous generator, a control box (screen), a radiator, a coupling, a fuel tank, a muffler and a common base. The axial direction of the flywheel housing of the diesel engine and the front end cover of the generator are directly connected by a shoulder positioning, and a cylindrical elastic coupling is used to directly drive the rotation of the generator by the flywheel. The connection mode is fixed together by screws to make them be connected into a steel body to ensure that the concentricity of the crankshaft of the diesel engine and the rotor of the generator is within the specified range.

In order to reduce the vibration of the unit, shock absorbers or rubber shock absorbing pads are usually installed at the connection between the main components such as diesel engine, generator, water tank and electric control box and the common base.