Cooling methods of standby diesel generator
There are two common
ways of cooling diesel generators, air cooling and water cooling. It is the
same principle as the engine. Both use the fast-heating and highly fluid
substance to take away the temperature in the environment to control the
working environment temperature. Water cooling is mainly performed by a water
circulation system. The water pump draws cold water into the cold water
pipeline and takes away the heat through the water flow wound in the water
cooling pipeline on the equipment.
Air cooling is generally
installed in the generator room ventilation system, through the exchange of hot
and cold air to control the indoor temperature, there are four common
ventilation systems:
1). Normal ventilation
system: For the ventilation of generator room, it is generally the ventilation
volume of 10 to 15 times of ventilation, and only exhaust fans can be set; if
there is gas for water supply and drainage, this system must also undertake the
exhaust system after the fire extinguishing.
2). The generator
process inlet and exhaust system: The generator itself has a large exhaust
pipe, which is the generator's own. It only needs to cooperate with an air
shaft. At the same time, the inlet system is designed to supplement the exhaust
air volume and the combustion air volume of the generator set.
3). Generator exhaust
gas system: It involves environmental protection issues, usually called “smoke
exhaust pipe”. The generator comes with it, and the electrical standard atlas
has a special well for the system. In fact, it is difficult for the engineering
design and construction to have so much open space. Most are discharged from
the generator exhaust shaft.
4). Exhaust system of
oil storage room: It can be used with the usual ventilation system. At this time,
the branch pipe leading to the oil storage room is equipped with check valve
and fire valve; it can also be set up a separate system and adopt
explosion-proof ventilator.
3. Matters need
attention
1). Diesel generator
room shall be equipped with the gas fire extinguishers. Solenoid valves shall
be set on the inlet and exhaust channels. When a fire occurs and the gas fire
extinguisher starts, these valves can be closed to ensure the fire
extinguishing effect.
2). Exhaust smoke of
diesel generators is pressure exhaust smoke, high flue gas temperature, high
air velocity, and flue gas needs to be discharged at high altitude. The flue
pipe should consider heat insulation, at the same time need to set up shock
absorber hanger.
3). Ventilation door or
shutters plays the role of isolating the machine room from the surrounding
environment. The operation of opening and closing shall be controlled by the
running state of the generator set.
4). The movable
ventilation door installed in the machine room in cold areas should allow the
airflow in the machine room to recirculate, so as to heat the machine room
during the cold machine, thereby improving the utility of the unit.
5). In areas with a cold climate, not only should pay attention to the cooling and ventilation of diesel generator set, but also make corresponding insulation measures for standby and rarely-operated gensets. It should also be noted that, for a standby generator set that is automatically put into operation when the main power fails, it is usually necessary to install a standard thermostatic controlled immersion cooling water heater.
In actual use, diesel generator sets need to work in a certain temperature environment, the working environment has a certain degree of ventilation, so it is necessary to ensure the ventilation requirements of diesel generator sets.
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