Basic introduction of diesel generator set

Operating principle of diesel generator set:

The operating principle of the generator set is that the diesel engine drives the generator to generate electricity. In the cylinder of the generator set, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel injected by the fuel injection nozzle. Under the upward extrusion of the piston, the volume is reduced and the temperature rises sensitively to reach the ignition point of the diesel. The diesel oil is ignited, the mixed gas is burned violently, the volume is sensitive and swollen, and the piston is pushed down, which is called "work". The cylinders of each generator set work in a certain order. The thrust acting on the piston changes into the force to push the crankshaft to roll through the connecting rod, and then drives the crankshaft of the generator set to rotate. By connecting the brushless synchronous generator with the coaxial equipment of the diesel engine crankshaft, the rotation of the diesel engine can be used to drive the rotor of the generator. Using the principle of "electromagnetic induction", the generator set will output the induced electromotive force and generate current through the closed load circuit. If you want to use the generator set to obtain usable and stable power output, you also need a series of diesel engine and generator control, protection equipment and circuits.

Opening process of diesel generator set:

Power generation equipment operation is a fixed asset investment operation supported by the state. It shoulders the burden of supplying complete sets of power generation equipment for the national economy and people's daily life. It has been opened rapidly in recent years. In 2008, the national production of power generation equipment continued to increase. From January to October, the cumulative output value of power generation equipment reached 107.4583 million KW, a year-on-year increase of 1.9%. The industrial policy of China's power operation will turn to the trend of optimizing the power structure, that is, give priority to renewable energy and new energy such as hydropower, nuclear power, wind power, solar power generation and biomass power generation, while for coal power, "settle down and optimize the structure, save resources, pay attention to environmental protection and trek through the technical and economic level". In the coming period, renewable and new energy power generation equipment will usher in excellent opportunities, and its proportion in China's total installed power generation capacity will gradually increase.

Future direction of diesel generator set:

Generator sets shoulder the burden of supplying complete sets of power generation equipment for the national economy and people's daily life, so they will occupy a very important position for a long time. With the trek of the s and the opening of the society, the original generator set is obviously not suitable for the needs of the society. Bulkiness, fuel consumption, noise and pollution, so the opening direction of the generator set in the future should be energy saving, environmental protection, lightness, miniaturization and elegant appearance. In this way, we can give full play to the potential advantages of the starting generator set.

Defect analysis of diesel generator set:

After long-term operation, the generator set will have various defects. In order to ensure the normal operation of each equipment, the defects of the generator set should be handled in time to ensure the normal operation of the generator set. How to clean the defects of generator set?

Fuse burnout

(1) causes of generator unit defects:

① Stator and rotor windings have open circuit (one phase is disconnected) or one phase of power supply loses power;

② Wrong connection at the beginning and end of the winding outgoing line or reverse connection inside the winding;

③ The contact of power circuit is loose and the contact resistance is large;

④ The load of the generator set is too large or the rotor is stuck;

⑤ The power supply voltage is too low;

⑥ The equipment of small generator set is too tight or the grease in the bearing is too hard;

⑦ The bearing is stuck.

(2) defect analysis of generator set:

① Find out the breaking point and correct it;

② Check winding polarity; Judge whether the winding end is correct;

③ Tighten the loose connecting screws, use a multimeter to judge whether each joint is false and correct it; Whether the voltage drop is too large due to the too thin power conductor, and correct it;

④ Use the equipment from the beginning to activate the collaterals; Replace qualified grease;

Bearing Overheating

(1) causes of generator unit defects:

① Too much or too little grease;

② Improper coordination between bearing and journal or end cover (too loose or too tight);

③ The end cover or bearing cover of the generator set is not installed flat;

④ The coupling between the generator set and the load is not calibrated, or the belt is too tight;

(2) defect analysis of generator set:

① Add smooth grease according to rules (1 / 3-2 / 3 of volume);

② Replace clean smooth grease;

③ If it is too loose, it can be corrected with adhesive. If it is too tight, it should be turned. Grind the journal or the inner hole of the end cover to make it suitable;

④ Proofread from the beginning and adjust the belt tension;

⑤ Calibrate the motor shaft or replace the rotor.

Abnormal noise during operation

(1) causes of generator unit defects:

① Rub the rotor against the stator insulating paper or slot wedge;

② Bearing wear or foreign matters such as sand in oil;

③ Loose stator and rotor iron core;

④ Stator winding is wrongly connected or short circuited.

(2) defect analysis of generator set:

① Trim the insulation and cut down the slot wedge;

② Replace the bearing or clean the bearing;

③ Overhaul stator and rotor iron cores;

④ Eliminate scratches and small rotor in the vehicle if necessary;

⑤ Eliminate stator winding defects.