Selection Diesel Oil for Diesel Generator
by Starlight Generator dieselgeneratortechDiesel is divided into three
grades of superior grade, first grade and qualified by quality. Each grade of
diesel can be divided into 10th, 0th, -10th, -20th - 35th and -50. No. Six
grades. No. 10 diesel indicates that its freezing point is not higher than 10
°C. For the rest, the specifications of diesel are shown in Table 3-1 on the
next page.
Performance
requirements for diesel fuel
In order to ensure the normal
combustion of diesel oil in high speed diesel engine, the performance
requirements of diesel oil are as follows:
1. Good combustibility, suitable
cetane number, low spontaneous combustion point, complete combustion, good
engine stability and no knock phenomenon.
2. Good evaporation performance,
appropriate evaporation rate, larger proportion of light fraction, otherwise it
will increase engine fuel consumption, wear and tear, and power loss.
3. The viscosity of diesel should
be suitable, that is, it has good fluidity to ensure the lubrication of high
pressure oil pump and the quality of spray atomization, and form a good mixture
gas.
4. Low sulphur content to ensure
that the engine is not corroded. Low sulphur content is one of the
characteristics of domestic diesel oil in China.
5. Good stability, the formation
of colloid in storage and combustion after the formation of carbon are less.
Cetane Ratio
The cetane ratio is an
approximate quantitative value representative of the ignition performance of
diesel in a diesel engine. It is measured in a standard engine test under
specified conditions by comparison with a standard fuel, expressed as a volume
percent of hexadecane in a standard fuel having the same ignition delay period
as the fuel being measured.
Ignition of
Diesel Oil
The ignitability of diesel fuel
is a heavy index indicator for evaluating the combustion performance of diesel.
The ignition of diesel refers to the ability of diesel to self-ignite. The
ignition of diesel is short. The ignition delay is short. After the fire is
burned, the pressure in the cylinder rises gently, and the diesel engine works
softly.
If the ignition delay period is
long, the amount of diesel fuel injected into the combustion chamber increases,
and the amount of mixture formed before the fire is large. Once the fire is on,
excessive diesel fuel is on fire, which causes the pressure in the cylinder to
increase rapidly, and the cylinder will Produces a strong shock effect, which
will cause the engine crank and link mechanism to withstand excessive impact
force, produce strong metal knocking sound, accelerate the wear of the parts
and make the diesel engine difficult to start, resulting in a decrease in
diesel engine power. Fuel consumption increases.
Selection of Diesel Oil for Diesel Generator
The structure, performance,
working state and ambient temperature of diesel engine are the basis of diesel
engine selection. As mentioned earlier, light diesel is used for diesel engines
with full load speed higher than 960r/min. Diesel oil with wider fraction and
heavier weight (from 150 ℃ to 400 ℃) can be used in precombustion
chamber diesel and swirl chamber diesel engine, while diesel oil with narrower
fraction and lighter weight (200 ℃ ~ 360 ℃) must be used in direct
injection diesel engine. Of course, the most important factor to consider when
choosing diesel oil is the ambient temperature of diesel engine.
There is a direct corresponding
relationship between the cold filter point of diesel and the actual operating
temperature, so when selecting diesel oil, the cold filter point of diesel oil
should be selected as the minimum temperature of 10% of the local risk rate,
and the diesel brand should be selected.
Usually we may refer to the
following principles for selection.
Diesel 10 is suitable for use on
a high speed diesel engine of genset with preheating equipment.
Diesel No. 0 is suitable for use
in areas where the minimum temperature is above 4 ℃ with a risk rate of 10%;
-10 diesel fuel is suitable for
use in areas where the minimum temperature of 10% risk rate is above -5 ℃;
-20 diesel fuel is suitable for
use in areas where the minimum temperature of 10% risk rate is -5 ℃ ~ 14 ℃;
-35 diesel fuel is suitable for
use in a region with a risk rate of 10% and a minimum temperature of -14 ℃ -29 ℃;
The-50 diesel fuel is suitable
for use at a minimum temperature of 10% in a region of-29 ℃-44 ℃.
Matters
Needing Attention in The Use of Diesel Oil
1. Different grades of diesel can
be blended, so there is no need to change seasons for special seasons. For
diesel with higher freezing point, 10%~40% of cracked kerosene can be added to
reduce its freezing point. For example, if 40% of cracked kerosene is blended
in No. 0 diesel, No.-10 diesel can be obtained.
2. Diesel oil can not be mixed
with gasoline, and when diesel oil is mixed with gasoline, the ignition
performance will become worse, which leads to the difficulty of starting or
even the failure to start. In order to improve the low temperature starting performance
of diesel engine, the starting fuel can not be directly injected into the
diesel fuel tank, so as to avoid causing air resistance or even fire.
3. Before the diesel oil is added
to the fuel tank , it must be fully settled ( not less than 48 hours ) ,
carefully filtered to remove impurities , and ensure the purification so as to
ensure that the precision parts of the diesel fuel supply system do not fail
and prolong its service life .
4. When using barrel high
freezing point diesel in winter, do not use open fire to avoid explosion.
Note: We are diesel generator manufacturer and we are in the field of diesel generating sets manufacturing more than 43 years. Products cover Cummins, Perkins, Volvo, Deutz, Ricardo, Yuchai, SDEC, Weichai and Wuxi, etc. All our products with CE/ISO approval.
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Created on Oct 24th 2018 20:58. Viewed 172 times.