Why Is the Coolant of Diesel Generator Not Circulating
by Starlight Generator dieselgeneratortechDuring the operation and
use of the diesel generator set, the coolant keeps circulating to cool the
temperature rise of the generator set. If the coolant in the cooling system of
the genset fails to circulate, the temperature of the cylinder and oil will
rise rapidly, which will cause the generator set to stop suddenly and directly
affect the use safety of the generator set.
Here
is the causes of coolant non circulation.
A.Heat sink of radiator
is blocked or damaged. The radiator will be rusted and leaking when it is used
for a long time, then the radiator causes the coolant temperature to rise all
the time.
B.There is fault in
thermostat. The thermostat is installed in the combustion chamber. Its function
is to control the temperature in the combustion chamber. If thermostat has
faults, the coolant can not maintain the circulating temperature, and even a
low temperature alarm will occur.
C.The coolant level is
too low or not as specified. If the liquid level is too low or too high, the
coolant temperature will rise without circulation. Our reference standard value
is 50% anti-icing fluid + 50% softened water + DCA4. If not within the standard,
it is easy to produce rust, which leads to the failure of normal circulation of
the coolant, and a series of problems occur in the coolant.
D.There is air in
cooling system. This will cause pipeline blocked. Suction valve on expansion
tank and damaged exhaust valve also effect circulation of coolant. Suction
pressure is 10KPA, discharge pressure is 40kpa. It should be noted that the
problem of unblocked exhaust pipe is also one of the important reasons
affecting the circulation.
E.There is fault in
water pump of the generator set. Check the water pump, if find that the gear
shaft of water pump drive is seriously worn, indicating the water pump is
useless. We need to replace it in time, so that cooling system can be normal.
In a word, as long as we
can know the causes, we will resolve the problem easily, and 250kw Deutz diesel
generator will work normally.
To avoid coolant
circulation system failure, we need to pay attention to some points.
When the engine of
diesel generator is working, the water surface level in the radiator will
gradually decrease due to the continuous evaporation of water in the radiator.
Therefore, the water surface level in the radiator should be checked before the
engine is started and for a long time. If water level is lower than the drain
pipe, clean soft water should be added. If it is hard water, it should be
softened first. ( Can not use hard water).
When the diesel
generator is used under 0℃ ambient
condition , the coolant shall be strictly prevented from freezing to prevent
the parts from cracking. Therefore, after diesel genset operate over, we should
drain coolant. For genset with closed cycle cooling system, appropriate
freezing point antifreeze coolant can be used according to the local minimum
ambient temperature. Commonly used coolants include ethylene glycol with water
and alcohol, glycerin with water.
When using inflammable
antifreeze coolant, because glycol, alcohol and glycerin are inflammables,
attention should be paid to fire prevention. Before using antifreeze coolant
for diesel engine, the dirt in its cooling system shall be cleaned to avoid new
chemical deposits, which may affect the cooling effect. For diesel engines
using antifreeze coolant, it is not necessary to drain the coolant after each
stop. But It needs to be supplemented and checked regularly. Never use 100%
antifreeze as coolant.
If there is too much
scale and dirt in the cooling system of diesel generator, it can cleaned by
cleaning liquid. The cleaning liquid can be prepared from 40g water, soda
(Na2CO3) and 10g water glass (Na2SiO3). When cleaning, pour the cleaning liquid
into the cooling water chamber of diesel engine, start up and operate until the
outlet water temperature is more than 60℃,
continue to operate for about 2 hours, then shut down and release cleaning
liquid. After the diesel engine is cooled, wash it twice with clean fresh
water, drain it and then pour it into the cooling water for start-up operation,
so that the outlet water temperature reaches above 75 ℃, stop the engine and
drain the sewage, and finally pour in new cooling water.
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Created on Nov 12th 2019 01:02. Viewed 262 times.