The global issue about energy source availability and environmental problem are alternative issue to be discussed recently.These problem are related to alternative source of fuel energy supply. Mostly, the research discusses about natural gas as an alternative fuel for internal combustion because many studies concluded that its availability and environmental effect of combustion were acceptable ,especially on marine diesel engine .This aims to analyze the implementation of Compressed Natural Gas(CNG) on four stroke diesel engine and its effect on engine performance based on experimental study. The engine is tested on five different speed,namely1800,1900,2000,2100 and 2200 rpm.The CNG quantity will be varied from 0-3 liter /minute when the engine is operated on 0-100% of engine load.The result show that power output decrease gradually when the CNG quantity increase.However,the decreasing of power output under dual fuel mode was not significant. The increase in amount of CNG gas injected into the combustion chamber affects the decreasing of diesel oil consumption Significantly.

1. “THE IMPLEMENTATION OF CNG AS AN ALTERNATIVE
FOR MARINE DIESEL ENGINE”
DO IT NOW
COLLEGE OF ENGINEERING & TECHNOLOGY,
AKOLA
Department of Mechanical engineering
Presented by
SHUBHAM S. AMODE
Guided by
Prof. S. R. THAKARE
A Seminar on

2.  INTRODUCTION
 DIAGRAM OFSHIP
 FUEL PROPERTIES
 DIFFERENCE BETWEEN DIESEL ENGINE AND
DUAL COMBUSTION ENGINE
 POWER OUTPUT
 TORQUE
 SPECIFIC FUEL CONSUMPTION
 ENVIRONMENTAL AND ECONOMICAL
EFFECT
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION
 REFERENCES
CONTENTS

3. INTRODUCTION
 The application of natural gas as an alternative
fuel is an interesting issue to be discussed. In
addition to produced cleaner emissions, the
availability of natural gas is still abundant so that
the price is cheaper when compared with diesel and
gasoline.
 Natural gas is an alternative fuel contain of
methane gas (CH4) with a composition of 87-96%
and other components, such as ethane, propane, n-
butane, iso-butane, n-pentane, iso-pentane, Hexane,
CO2, Nitrogen, O2, and hydrogen on small
quantity.

4. FIGURE OF THE SHIP

5.  Compressed Natural Gas (CNG) is an
alternative fuel that can be used as a
substitute for gasoline, diesel fuel and
propane / LPG. Natural gas is a gas with the
main composition is methane (CH4).
 Usually the methane gas content is more
than 90-98% in natural gas, depending on
the location of the source and process of
natural gas processing.

6. FIG - DIESEL ENGINE
FIG – DUAL FUEL ENGINE

7.  The addition of electrical load is followed by an increase in voltage and current
which causes an increase in engine power.
 The energy produced from combustion makes the engine power greater in
accordance with the load given to the engine.
Fig- Variation of power output with engine load at constant speed(2200rpm)

8.  The addition of diesel fuel consumption alone will be controlled by a
centrifugal governor that works according to engine speed and the rotation
will be kept constant even though there is an additional load.
 This is because the changes in the current and voltage values produced by
the generator are also relatively small so there is no noticeable difference in
the large torque values.

9. Specific Fuel Consumption
 Specific fuel consumption (SFC) is the amount of fuel
needed to produce one unit of power within one hour.
 SFC is a machine measuring indicator in consuming fuel.
 The specific fuels tends to decrease with increasing load.

10. • The study illustrated that NO(X), SO(X),
particulate matter and CO(2) emissions
were reduced by 72 %, 91%, 85%, and 10%
respectively.
 In addition the cost of both fuel
consumption and maintenance operation
demonstrated reduction by 39% and 40%
respectively.

11.  A dual fuel Marine engine can run on both
diesel fuel and gaseous fuel.
 It is used gaseous fuels, which are cheap and
easily available.
 It is used gaseous fuels which are free from
pollution. So it is environment friendly engine.
 Because of clean combustion, it reduces wear
and tear in engine and also requirement of
lubricating oil.
 These engines are very suitable for LPG and CNG.
 It generates high power than diesel fuel at
higher load conditions.

12. • Always require pilot fuel for combustion.
• Slightly decrease in power output under dual fuel mode.

13.  DESA
 MAN
 WARTSILA
 DAIHATSU DIESEL
 DIESEL
 CATERPILLAR OIL AND
GAS

14. The effect of CNG addition has been investigated above. According to
data obtained, the finding of this study are concluded as follows:
 Power output is the most important parameter of engine performance.
According to the data obtained, the addition of natural gas into
combustion chamber affect the power output. When the natural gas
quantity increase, the power output decrease gradually. However, the
decreasing of power output under dual fuel mode was not significant.
 The torque value increases with increasing load. The increase in the
amount of CNG gas injected into the combustion chamber will be
followed by increasing torque.
 Specific fuel consumption (SFC) is the amount of fuel needed to
produce one unit of power within one hour. When a diesel engine is
operated with a dual fuel system, diesel oil consumption has decreased
significantly with the addition of CNG fuel entering the combustion
chamber.

15. REFERENCES
[1] Semin and Rosli, A. B. (2008) ‘A Technical Review of Compressed Natural Gas as an
Alternative Fuel for Internal Combustion Engines’, American J. of Engineering and
Applied Sciences, 1(4), pp. 302–311.
[2] Arif, A. and Sudarmanta, B. (2015) ‘Karakterisasi performa mesin diesel sistem dual
fuel Solar-CNG tipe LPGI dengan pengaturan start of injection dan durasi injeksi CNG’,
Tesis Magister, Institut Teknologi Sepuluh Nopember Surabaya.
[3] Semin, Idris, A. and Bakar, R. A. (2009) ‘An Overview of Compressed Natural Gas as an
Alternative Fuel and Malaysian Scenario’, European Journal of Scientific Research, 34(1),
pp. 6–15.
[4] Wei, L. and Geng, P. (2016) ‘A review on natural gas/diesel dual fuel combustion,
emissions and performance’, Fuel Processing Technology. Elsevier B.V., 142, pp. 264–278.
[5] Wang, Z. et al. (2016) ‘Impact of pilot diesel ignition mode on combustion and emissions
characteristics of a diesel/natural gas dual fuel heavy-duty engine’, Fuel. Elsevier Ltd,167,
pp. 248–256.