Why Diesel Generator Fails to Produce Specified Power
by Starlight Generator dieselgeneratortechThe specific causes and
solution methods are as follows:
1.Failure to produce
specified power due to failure of valve mechanism and air inlet and exhaust
system.
Reason:
Incorrect clearance
between intake, exhaust valves and rocker arms;
Incorrect actual opening
and closing time of intake and exhaust valves;
Valve spring is damaged;
The valve has carbon
deposits and the sealing surface leaks;
Air filter is blocked;
Exhaust pipe and
silencer have serious carbon deposits and poor exhaust.
Treatment methods:
Check and adjust to
specified clearance;
Check and adjust the
opening and closing time of intake and exhaust valves;
Replace new valve
spring;
Remove the carbon
deposit and grind the valve;
Clean air filter and
remove carbon deposit.
2.Failure to produce the
specified power due to insufficient compression pressure.
Reason:
There is air leakage at
the sealing part of the cylinder head and the engine body, which shows that a
stream of air flows out of the gasket when changing speed, and the big nut of
the cylinder head is loose;
The piston ring is
stuck, the valve stem is not flexible, and the cylinder head injector hole is
leaking. The copper washer of the tight cap of the injector is damaged, and the
injector hole plane is not cleaned;
The joint surface of
fuel injector and fuel injector body is damaged.
Treatment methods:
Check the joint surface
of cylinder head and engine body, replace the cylinder gasket, clean and
repair;
Replace piston ring;
Clean the seat hole;
Tighten the fuel
injector tight cap or grinding plane.
3.Failure to produce the
specified power due to over high water temperature.
Reason:
Diesel engine
overheating (cooling or lubrication system failure).
Treatment
methods:
Overhaul the cooling and
lubrication system and remove scale from the water jacket, cleaning the oil
cooler.
4.Failure to produce the
specified power due to abnormal oil supply and fuel system failure.
Reason:
Air intakes into oil system;
Fuel injection pump
failure;
Injector failure.
Treatment methods:
Release air from the
fuel system;
Repair or replace parts;
Repair or replace parts
of injection.
If we want to know
whether the diesel generator produce specified power, we need to know how many
kinds of power of diesel genset:
Continuous power(COP):
the maximum power which under agreed operating maintenance conditions and in
accordance with the manufacturer's specifications, the generator is
continuously operated at constant load and the maximum number of operating
hours per year is unrestricted.
Prime power(PRP): the
maximum power at which the generator operates continuously at variable load and
unlimited operating hours per year under agreed operating conditions and
maintenance as specified by the manufacturer. The average power output during
the 24-hour operating cycle shall not exceed 70% of the basic power unless
agreed with the engine manufacturer. Continuous power (COP) shall be used in
applications where the allowable average power output is required to be higher
than the specified value. The unit is called rated prime power diesel generator
set.
Emergency standby
power(ESP): the maximum power which under the agreed operation conditions and
in accordance with the manufacturer's regulations for maintenance, once the
main power supply grid is interrupted or under the experimental conditions, the
generator operates with variable load and the operation time reaches 200h per
year. The average power output allowed during the 24-hour operating cycle shall
not exceed 70% of the emergency standby power unless agreed with the engine
manufacturer. The unit is called emergency standby power diesel generator set.
Limited running time
power(LRTP): the maximum power which under the agreed operation conditions and
in accordance with the manufacturer's regulations for maintenance, the
operation time of diesel generator can reach 500h per year. In accordance with
100% limited running time power, the diesel generator set can operate 500h per
year.
The standard also
specifies the site conditions for the operation of the generator set: the site
conditions are determined by the user. If the site conditions are unknown and
there are no other regulations, the following rated site conditions should be
adopted:
1. Absolute atmospheric
pressure: 89.9kPa (or altitude of 1000m).
2. Ambient temperature:
40 ℃.
3. Relative humidity:
60%.
In generally, output
power calibrated on generator set nameplate is divided into continuous power,
prime power and standby power.
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Created on Nov 9th 2019 00:07. Viewed 267 times.