Mak M20C Genset. Project Guide

79 Pages·2.983 MB·English

M 20 C
Project Guide • Generator Set
m
Introduction
Information for the user of this project guide
The project information contained in the following is not binding, since technical data of products may
especially change due to product development and customer requests. Caterpillar Motoren reserves
the right to modify and amend data at any time. Any liability for accuracy of information provided
herein is excluded.
Binding determination of data is made by means of the Technical Specification and such other agree-
ments as may be entered into in connection with the order. We will supply further binding data, draw-
ings, diagrams, electrical drawings, etc. in connection with a corresponding order.
This edition supersedes the previous edition of this project guide.
All rights reserved. Reproduction or copying only with our prior written consent.
Caterpillar Motoren GmbH & Co. KG
P. O. Box, D-24157 Kiel
Germany
Phone [phone]
Telefax [phone]
Issue April 2007
m
m
Contents
Page
1. Engine description 1 - 2
2. General data and outputs 3 - 4
3. Restrictions for low load operation 5
4. Load application and recovery behaviour 6 - 7
5. Technical data 8 - 9
6. Genset dimensions and weights 10 - 13
7. Required dimensions of generator 14
8. Space requirement for dismantling of charge air cooler and
turbocharger cartridge 15
9. System connections 16
10. Fuel oil system 17 - 30
11. Lubricating oil system 31 - 36
12. Cooling water system 37 - 44
13. Flow velocities in pipes 45
14. Starting air system 46
15. Combustion air system 47
16. Exhaust system 48 - 53
17. Air borne sound power level 54
18. Foundation 55 - 58
19. Control and monitoring system 59 - 67
20. Diesel engine management system DIMOS 68
21. Standard acceptance test run 69
22. EIAPP certificate 70
23. Painting/Preservation 71 - 72
24. Lifting of gensets 73
25. Engine parts 74
m
1. Engine description
The M 20 C is a four stroke diesel engine, non-reversible, turbocharged and intercooled with direct fuel
injection.
In-line engine M 20 C
Cylinder configuration: 6, 8, 9 in-line
Bore: 200 mm
Stroke: 300 mm
Stroke/Bore-Ratio: 1.5
Swept volume: 9.4 l/Cyl.
Output/cyl.: 170/190 kW
BMEP: 24.1/24.2 bar
Revolutions: 900/1000 rpm
Mean piston speed: 9/10 m/s
Turbocharging: constant pressure system
Direction of rotation: counter-clockwise,
viewed from driving end
6 5 4 3 2 1 Cyl. number
Free end Driving end
Control side
Exhaust side
1
m
1. Engine description
Engine design
- Designed for heavy fuel operation up to 700 cst./50 °C, fuel grade acc. to CIMAC H55 K55, ISO 8217,
1996 (E), ISO-F-RMH55 RMK55.
- 1-piece dry engine block made of nodular cast iron. It incorporates the crankshaft bearing, cam-
shaft bearing, charge air receiver, vibration damper housing and gear drive housing.
- Underslung crankshaft with corrosion resistant main and big end bearing shells.
- Natural hardened liners, centrifugally casted, with calibration insert.
- Composite type pistons with steel crown and aluminium alloy skirt.
- Piston ring set consisting of 2 chromium plated compression rings, first ring with chrom-ceramic
layer and 1 chromium plated oil scraper ring. Two ring grooves are hardened and located in the
steel crown.
- 2-piece connecting rod, fully machined, obliquely split with serrated joint.
- Cylinder head made of nodular cast iron with 2 inlet and 2 exhaust valves with valve rotators.
Direct cooled exhaust valve seats.
- Camshaft made of sections per cylinder allowing a removal of the pieces sideways.
- Turbocharger with inboard plain bearings lubricated by engine lubricating system
- No water cooling for turbocharger.
- 2-circuit fresh water cooling system with single charge air cooler.
- Nozzle cooling for heavy fuel operation only with engine lubricating oil.
2
m
2. General data and outputs
900 rpm / 60 Hz 1000 rpm / 50 Hz
Engine Generator Engine Generator
kWm kWe kWm kWe
6 M 20 C 1020 969 1140 1083
8 M 20 C 1360 1292 1520 1444
9 M 20 C 1530 1453 1710 1624
Remark:
The generator outputs are based on 95 % efficiency and a power factor of 0.8.
Output definition
The maximum continuous rating stated by Caterpillar Motoren refers to the following reference condi-
tions according to "IACS" (International Association of Classification Societies) for main and auxiliary
engines:
Reference conditions according to IACS (tropical conditions):
air pressure 100 kPa (1 bar)
air temperature 318 K (45 °C)
relative humidity 60 %
seawater temperature 305 K (32 °C)
The permissible overload is 10 % for one hour every twelve hours. The maximum fuel rack position is
limited to 110 % continuous rating.
Fuel consumption
The fuel consumption data refer to the following reference conditions:
intake temperature 298 K (25 °C)
charge air temperature 318 K (45 °C)
charge air coolant inlet temperature 298 K (25 °C)
net heating value of the Diesel oil 42700 kJ/kg
tolerance 5 %
Specification of the fuel consumption data without fitted-on pumps; for each pump fitted on an additio-
nal consumption of 1 % has to be calculated.
Increased consumption under tropical conditions 3 g/kWh
3
m
2. General data and outputs
Lubricating oil consumption
Actual data can be taken from the technical data.
Nitrogen oxide emissions (NO -values)
x
NO -limit values according to MARPOL 73/78 Annex VI: 11.5/11.3 g/kWh at 900/1000 rpm
x
Generator according to cycle D2: 10.5/10.0 g/kWh at 900/1000 rpm
General installation aspect:
Inclination angles at which gensets and essential aux. machinery is to operate satisfactorily:
Heel to each side: 15°
Rolling to each side: + 22,5°
Trim by head and stern: 5°
Pitching: + 7,5°
4
m
3. Restrictions for low load operation
The engine can be started, stopped and run on heavy fuel oil under all operating conditions.
The HFO system of the engine remains in operation and keeps the HFO at injection viscosity. The tem-
perature of the engine injection system is maintained by circulating hot HFO and heat losses are com-
pensated.
The lube oil treatment system (lube oil separator) remains in operation, the lube oil is separated con-
tinuously.
The operating temperature of the engine cooling water is maintained by the cooling water preheater.
Below 25 % output heavy fuel operation is neither efficient nor economical.
A change-over to diesel oil is recommended to avoid disadvantages as e.g. increased wear and tear,
contamination of the air and exhaust gas systems and increased contamination of lube oil.
Cleaning run of engine
3 h 2 1 h 30 min 15 min 0
PE %
100
Cleaning run after partial load operation
70
50 Load increase period
approx. 15 min.
40
30
20
HFO-operation
15
10
8
Restricted HFO-operation
6
1 h 2 3 4 5 6 8 10 15 20 24 h
Emergency start in the event of black out
Emergency start with gravity feed fuel from the diesel oil day tank is possible.
The bottom edge of the diesel oil day tank has to be arranged approx. 4 m above injection pump level.
5
m
4. Load application and recovery behaviour
The permissible load increase according to ISO 8528-5 and IACS must be carried out in several steps,
depending on the mean effective pressure. The ship‘s network must be designed so that this permissi-
ble load increase is kept. The shipyard is to provide the approval of the responsible classification
society in time before classification acceptance of the engine.
Reference values for load steps, depending on bmep at continuous rating
4. load step
100
g
n 90
ati
r [%]
s
u
o 80
u 3. load step
n
nti
o
c 70
o
d t
e Limiting curve for
eferr 60 2. load step 3rd load step
r
e
s 50
a
e Limiting curve for
ncr 2nd load step
d i 40
a
o 1. load step
L
30
Limiting curve for
1st load step
20
10
6 8 10 12 14 16 18 20 22 24 26 28
BMEP at cont. rating of diesel engine
[bar]
Example: 6 M 20 C, 1140 kW, 1000 rpm, bmep = 24.2 bar
1. max. load from 0 % to 33 % MCR
2. max. load from 33 % to 55 % MCR
3. max. load from 54 % to 75 % MCR
4. max. load from 75 % to 100 % MCR
6