A diesel generator set is a kind of small power generation equipment, which uses diesel as fuel and diesel engine as prime mover to drive the generator to generate power. The diesel generator set is generally composed of diesel engine, AC synchronous generator, control panel (distribution and control system) and other components. Diesel generator set is a small independent power generation equipment, with an internal combustion engine as the power to drive synchronous alternator and generate electricity. It can be fixed in a certain place, positioning and use, or mounted on a trailer for mobile use. Although the power of diesel generator set is low, but because of its small size, flexibility, lightweight, easy to operate and maintenance, it is widely used in mines, railways, field sites, and road traffic maintenance, as well as factories, enterprises, hospitals and other departments, as a backup or temporary power supply. In recent years, the unattended automatic emergency power station has expanded the use of this kind of generator set.
Classification of diesel generator sets
The generator in the diesel generator set is the device that converts the mechanical energy of the diesel engine into electric energy and is the output part of electric power. There are many types of diesel generator sets, which can usually be classified in the following ways:
- Use conditions: Land and Marine diesel generator sets. Land units can be divided into fixed type and mobile (trailer type)
- Requirements for land use units: ordinary diesel generator sets, automatic type, low noise type and low noise automatic type.
- Generator output current: diesel generator sets can be divided into AC generator sets and DC generator sets.
- Ac synchronous generator excitation mode: unit equipped with rotating AC exciter excitation system and unit equipped with static exciter excitation system;
- Application: Common diesel generator set, standby generator set, emergency generator set.
How do diesel generator sets work?
Diesel engine is the heart of diesel generator set. In the diesel cylinder, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel injected by the nozzle, and the volume shrinks under the upward extrusion of the piston, and the temperature rises rapidly to the ignition point of the diesel. Diesel is ignited, the mixture of gas intense combustion, rapid volume expansion, push the piston down, known as’ work ‘. Each cylinder works in a certain sequence, and the thrust force acting on the piston becomes the force pushing the crankshaft through the connecting rod, thus driving the crankshaft to rotate. The diesel generator thus completes a working cycle. A brushless synchronous alternator is installed coaxial with the crankshaft of a diesel engine. The rotor of the generator can be driven by the rotation of the diesel engine. This is called electromagnetic induction.
Applications of diesel generator sets
Diesel generator set has excellent adaptability, types, low long-term operation cost, and high electricity generation efficiency, so its application is very wide, currently mainly used in mines, ships, ports, field sites, municipal machinery and large power plants.
The generator sets used in mines are mainly small ones, which use diesel as the prime mover to drive the generator to generate electricity. The small generator sets can be fixed and positioned as a whole, and can also be mounted on the drag machine for mobile use. When diesel generators are used in ships or ports, they are different from small-scale generators in mines. Large diesel generators are needed to keep the ship’s equipment and support systems running. It takes a long time to restart the generator set after it stops running, so the generator set is required to ensure that the ship can move at any time. The diesel generator set used in the construction site belongs to non-continuous operation power generation equipment. Although the power generation efficiency of the field diesel generator set is relatively low, it is small in size, flexible, lightweight, complete and easy to operate and maintain. In addition, diesel generator sets are also used in municipal, agricultural, construction machinery and so on.