The methods for checking the
intake system of a diesel generator are as follows.
Check for cracks or perforations
in the hose, soft movement of the clamp, tighten or replace if found, to ensure
that the intake system does not leak.
Check and
maintain intercooler
Use the naked eye to check the
inlet air cooler for cracks, perforations, or other damage to the air chamber,
pipes, radiators, etc.
Check the
air filter
When the air filter resistance
exceeds the following values, the air filter element shall be replaced.
Supercharged and supercharged
intercooled type: 6.2KPA;
Natural suction: 5.0Kpa.
Note: air filter resistance
should be checked when the diesel engine is calibrated.
If the air filter is equipped
with a maintenance indicator, check periodically, and replace the air filter
element if the red flag 2 has risen to the inspection port position.
After replacing the air filter
element, press the button switch on the end of the maintenance indicator to
reset it.
Warning: do not allow the
operation of diesel generator sets without air filters. Otherwise, it is easy
to cause early wear and tear of diesel generator set.
Fault
diagnosis analysis of intake and exhaust system of diesel generator set.
The intake system of the diesel
generator set is equipped with dry air filter and air filter and air resistance
indicator, with exhaust gas turbocharger, full intake and guaranteed
performance. Pules dry exhaust pipe is used in the exhaust system of diesel
generator set, which can make full use of exhaust energy and give full play to
engine performance. In addition, the genset is equipped with a diameter of
127mm exhaust elbow and exhaust bellows, easy to connect. Therefore, the intake
and exhaust system of diesel generator sets is very important to ensure the
performance of the generator. So how to diagnose and analyze the intake and
exhaust system of diesel generator.
Air entering the unit cylinder
should be kept clean (if the air enters the cylinder with dust and dirt, it
will cause early wear and tear of the cylinder sleeve, piston ring, and also
damage the valve rod and duct. Larger waste can also damage the blades of the
turbocharger. Therefore, diesel generator units should be equipped with intake
air filters.
1. Intake
air leakage of diesel generator set
1) Too much air intake resistance
causes black smoke and power reduction (air filter can be blown three times
with compressed air and will have to be replaced later).
2) Too much smoke or lower power of
turbocharged diesel engine may be due to loosening of pressure section of
intake pipe or serious leakage of rubber pipe.
3) Air leakage in the intake
system, in addition to inspection with the naked eye, but also with soap foam
in the possible leak to check.
2. Diesel
generator exhaust part fault
Check exhaust leakage, gasket
leakage, exhaust pipe, silencer resistance of exhaust pipe and supercharger.
The increase of exhaust leakage and resistance will lead to the decrease of
turbocharger speed, the reduction of air volume, the decrease of intake pressure,
the increase of exhaust smoke and the decrease of power. Leakage of exhaust gas
usually detects leakage sound or can be seen that high temperature gas
discolors the material near the leak. If the exhaust is blocked, the
turbocharger can not work effectively, so the factor of power reduction caused
by exhaust resistance cannot be ignored.
1) The breakdown of supercharger
reduces its supercharging efficiency and causes the decrease of diesel engine power
and the increase of smoke.
2) Diesel generator oil supplies
the supercharger with bearings and provides some cooling with its working oil
pressure through the tubing. The return pipe is connected to the bottom of the
middle shell of the supercharger, and the oil goes back to the diesel fuel pan
along the return pipe. Seal rings are arranged at both ends of the rotor part
of the supercharger. The main role of the seal ring is to prevent exhaust and
pressurized air intake supercharger in the middle shell. Oil leakage from the
seal ring is rare, but it can still occur.
If the pressure of the crankcase
is too high, it will hinder the return of the turbocharger and fill the oil
with the middle shell. The oil will pass through the compressor seal ring and
blow into the cylinder of the diesel engine with the pressurized air.
If the return tube of the
supercharger is blocked or damaged, the oil pressure in the middle shell will
rise and the oil will flow along the seal to the compressor or turbine inlet
vortex shell.
High intake and exhaust resistance
creates a vacuum between the compressor and the supercharger housing, causing
the sealing ring to leak oil.
Check: the above problem can be
removed turbine exhaust pipe and compressor outlet pipe, check for oil leaking
from the seal ring.
3) A leak in the intake and
exhaust system of a generator set makes additional noise (usually a very
sharp whistle).
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