01-5 design and function

7/26/2019 01-5 Design and Function

http://slidepdf.com/reader/full/01-5-design-and-function 1/19

1 © Wärtsilä 27 September 2007 W50DFA1V00BTM01A Rev. 01

WÄRTSILÄ W50DF

STANDARD ENGINE

DESIGN AND FUNCTION




INTRODUCTION

Compact design of Wärtsi lä 50DF




INTRODUCTION

Ancillary equipment and connections

Gas manifold

Gas filter

Power module

Charge air receiver

Inert gas inlet

Gas inlet

LT water inlet

Lubricating oil inlet

Turbocharger

HT water air vent from air cooler

HT water air vent

LT water air vent from air cooler

Charge air cooler

HT water to alternator

LT water outlet

Lubricating oil outlet

HT water outlet

HT water inlet




INTRODUCTION

Al l ancillary equipment mounted at engine free end

Pressure regulating valve

Lubricating oil pump

Oil from LO pump

HT water pump

Fuel filter

Pilot injection pump

Pilot fuel outlet

Pilot fuel inlet

Water separator

Centrifugal filter

LT water pump

Running in-filter




GENERAL DESING

Core design values

Proven gas system, pilot fuel system andengine control system technology withsafety aspects included

Integrated and modular design based onWärtsilä 46

Wärtsilä 50DF engine is manufactured inconfigurations from 6L up to 18V

Engine block always fitted on common base

frame Latest and the most advanced

environmental solutions are integrated intoengine basic design

Low operating costs by dual-fuel technology Easy access for easy maintenance

Resilient mounting with rubber elements




GENERAL DESING

The Wärtsilä 50DF is a four-stroke dual-fuel engine that can be run either on natural gas or light fueloil (LFO) and, with certain modifications, also on heavy fuel oil (HFO). The engine combines the highlysuccessful Wärtsil ä 46 engine strengths to the economical dual-fuel technologies. Reliability is s tillthe guiding princ iple for Wärtsil ä 50DF engine. Low maintenance costs , environmental issues withproven emission control options and installation easiness are also strongly in focus.

Design philosophy

The main features of the Wärtsil ä 50DF

High thermal efficiency and low emissions

The lean-burn concept

The air-fuel ratio in combustion is very high since the same specific heat quantity released by combustion is used to

heat up a larger mass of air. Thus the maximum temperature and consequently NOx formation are lower

Flexibility with emission control The Wärtsilä 50DF can be run either on natural gas or LFO and also on HFO

Designed to give the same output whether it is running on natural gas or on LFO/HFO

Output ranges for the Wärtsilä 50DF engines and generating sets

17100

15200

11400

85507600

5700

Engine [kW]

Outpu t 50 Hz, 60 Hz

82509L50DF

1650018V50DF

1467016V50DF

1100012V50DF

73308L50DF

55006L50DF

Generating set [kWe]Engine configuration

Output ranges for Wärtsilä 50DF engines and generating sets




GENERAL DESING

The main features of the Wärtsi lä 50DF Dual-fuel technology

Divided in to two systems: gas system and diesel oil system

Gas system

Lean-burn technology with pilot fuel ignited Otto-principlecombustion

Low pressure natural gas and LFO

Diesel oil system

Divided in to two systems: pilot fuel system and back-up fuel system

LFO/HFO

Operation mode transfer

The engine can be switched automatically from fuel oil to gasoperation at loads below 80 % of the full load

Twin-needle injection valve with electronically controlled pilot injection and

hydro-mechanically controlled main diesel injection

High reliability with low maintenance costs

Increased component lifetime and time between overhauls

Common components with Wärtsilä 32DF and Wärtsilä 46

Ancillaries; pumps, filters, coolers located to facilitate easy accessibility

Safe bearing technology

The big-end bearing housing is hydraulically tightened, resulting in adistortion-free bore for the corrosion-resistant precision bearing

Installation easiness

All ancillaries are built on the engines

Optionally with separate ancillaries

All connections are concentrated to few points

Design philosophy




GENERAL DESING

Design philosophy

Wärtsil ä 50DF engines are designed keeping in mi nd existing SOLAS requirements already in basicdesign phase.

Design concept is based on the SOLAS rules:

Compliance with SOLAS fire safety regulations

SOLAS II-2/15.2.9 - 15.2.12.

Arrangements for oil fuel, lubricating oiland other flammable oils




GENERAL DESING

Summary of SOLAS requirements SOLAS II-2/15.2.9 - 15.2.12. Arrang ements fo r oil fuel,lubricating oil and other flammable oils

Description of requirementsSOLAS

Requirement

Lubricating oil arrangements”The arrangements for the storage, distribution and utilization of oil used in pressure lubrication systems shall be such as to ensure the

safety of the ship and persons on board. The arrangements made in machinery spaces of category A, and whenever practicable in other

machinery spaces, shall at least comply with the provisions of paragraphs 2.1, 2.4, 2.5, 2.6, 2.7, 2.8, 2.10 and 2.11 ”screened or

otherwise suitably protected”.

(4)

Low pressure fuel oil pipes”Oil fuel lines shall be screened or otherwise suitably protected to avoid, as far as praticable, oil spray or oil leakages onto hot surfaces,

into machinery air intake, or other sources of ignition. The number of joints in such piping system shall be kept to a minimum.”

(3)

Hot su rfaces”All surfaces with temperatures above 220 °C which may be impinged as a result of a fuel system failure shall be properly insulated.”

(2)

High pressure fuel pipes”All external high-pressure fuel delivery lines between the high-pressure fuel pumps and fuel injectors shall be protected with a jacketed

piping system capable of containing fuel from a high-pressure line failure. A jacketed pipe incorporates an outer pipe into which the high-

pressure fuel pipe is placed, forming a permanent assembly. The jacketed piping system shall include a means for collection of leakages

and arrangements shall be provided for an alarm to be given of a fuel line failure.”

(1)




GENERAL DESING

Summary of SOLAS requirements SOLAS II-2/15.2.9 - 15.2.12. Arrang ements for oil f uel,lubricating oil and other flammable oils

Guidelines to SOLAS

Shielding is only required for piping systems

under pressure exceeding 0.18N/mm2 [1.8 bar]

which are located above or near units of high temperature,

including boilers, steam pipes, exhaust manifold, silencers

or other equipment required to be insulated by SOLAS reg. II-2/15.2.10.

It is further required if oil spray or oil leakages may reach machinery

intakes or other sources of ignition.




GENERAL DESING

Sectional view of

Wärtsi lä 50DF

Fig. name: Sectional view of engine




TERMINOLOGY

Designation of cylinders

Designation of engine sides and ends

Fig. name: Designation of cylinders

Manoeuvring s ide and rear si de. Details

located on the manoeuvring side may be

marked with "M" and correspondingly "B"

for the back of the engine (B - bank on a

V - engine).

Clockwise rotating engine. When looking

at the engine from the driving end the shaftrotates clockwise.

Counter - clockw ise rotating engine.When looking at the engine from the driving

end the shaft rotates counter - clockwise.




TERMINOLOGY

Designation of bearings

Main bearings: The flywheel bearing is No. 0, the

first standard main bearing is No. 1, the second No.

2 etc.Thrust bearings: The thrust bearing rails are

located at the flywheel bearing. The outer rails

close to the flywheel are marked with 00 and the

inner rails with 0.

Camshaft bearings: The camshaft bearings are

designated the same as the main bearings and the

thrust bearing bushings are designated; the outer

00 and the inner 0

Camshaft gear bearings: The bearings located on

the flywheel side and are designated 00 and theinner bearings 0.Upper and lower bearing shells: In bearings

where both bearing shells are identical, the upper

one is marked with UP.

Fig. name: Designation of bearings




TERMINOLOGY

Designation of valves

Fig. name: Designation of valves




TERMINOLOGY

Example of reading the flywheel

Fig. name: Example of reading the flywheel

System components 01 Flywheel indicator

02 Flywheel graduation

Marking of the flywheel:The flywheel is divided into 360º, starting from TDC

at firing for cylinder 1. TDC at firing for every cylinder

is marked on the flywheel. There is a common

marking for the cylinders in engines with even

cylinder numbers, one cylinder is at TDC at firing and

the other is at TDC at scavenging. There are

separate scales for A - and B - bank in a V - engine.

Firing intervals, in crank angles, can be determined

by dividing 720°

with the number of cylinders. On anexample engine, the fuel timing is read to 17° for cylinder A2 when the flywheel is in the position

shown in the figure.




TERMINOLOGY

W50DF engines, in-line engine

Cylinder bore:Piston stroke:

Speed:Mean effective pressure:

Piston speed:

Output/cylinder:

Fuel specification:

Fuel oil

Natural gas

500 mm580 mm

500 rpm 514 rpm20.0 bar 19.5 bar

9.7 m/s 9.9 m/s

950 kW

730 cSt/50 °C

ISO 8217, category ISO-F-DMX, DMA and DMB

Methane Number: 80

LHV: min. 28 MJ/nm³, 5.5 bar BSEC 7410 kJ/kWh

240232601710018V50DF

*) At flywh eel**) Dry weight

20670

15500

11630

10340

7750

Output [Bhp]*

15200

11400

8550

7600

5700

Output [kW]*

1489L50DF

22016V50DF

17512V50DF

1288L50DF

966L50DF

Weight [ton]**Engine configuration

Rated power




TERMINOLOGY

P (kW/cyl.)

Rpm * 0,08033or

P (hp/cyl.)

Rpm * 0,10921

Mean Effective Pressure

Calculating of Mean Effective Pressure

A1-B1-A3-B3-A2-B2-A5-B5-A8-B8-A6-B6-A7-B7-A4-B416V50DF

A1-B1-A5-B5-A3-B3-A6-B6-A2-B2-A4-B412V50DF

A1-B8-A7-B6-A4-B3-A2-B9-A8-B5-A6-B1-A3-B7-A9-B4-A5-B218V50DF

I: 1-2-4-6-8-9-7-5-3

II: 1-7-4-2-8-6-3-9-59L50DF

I: 1-3-2-5-8-6-7-4

II: 1-6-2-4-8-3-7-58L50DF

1-5-3-6-2-46L50DF

Firing orders of clockwise rotating enginesEngine configuration

Firing order




MAIN TECHNICAL DATA

Wärtsi lä 50DF

L-engine

1455

1455

1455

F

148.0

128.0

96.0

Weight (dry)

**) = Subject to revision without notice A = Total lengthC = Total breadthB+F = Total height (from the bottom of the oil sump to the exhaust outlet)

382031003600108009L50DF

38203100360099508L50DF

38202850358081156L50DF

DCB AEngineconfiguration

Principle engine dimensions [mm ] and weights [tonnes]**




MAIN TECHNICAL DATA

Wärtsi lä 50DF

V-engine

1500

1500

1500

F

240.0

220.0

175.0

Weight (dry)

**) = Subject to revision without notice A = Total lengthC = Total breadthB+F = Total height (from the bottom of the oil sump to the exhaust outlet)

3600453042801372518V50DF

3600453040551266516V50DF

3600381040551046512V50DF

DCB AEngineconfiguration

Principle engine dimensions [mm ] and weights [tonnes]**

01-5 design and function

Documents