ABB Power2 850-M16 Operation Manual page 37
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Operation Manual / Power2 800-M / 4 Product description
1
Introduction
Mode of operation of the low-pressure stage (Power2 LP)
Figure 3: Power2 LP diagram
Power2
Two-stage turbocharging
Power2 LP
Low-pressure stage
Power2 HP High-pressure stage
A
Exhaust gas inlet from internal
combustion engine
B
Exhaust gas outlet
C
Air or air/gas mixture inlet
D
Air or air/gas mixture outlet and supply to
the charge air cooler
The low-pressure stage (Power2 LP) is a turbomachine and consists of the main components
turbine and compressor. These components are installed on a common shaft and form the
rotor.
In the low-pressure stage (Power2 LP) shown in the illustration (see Figure 2), the exhaust
gas coming from the high-pressure stage (Power2 HP) flows through the gas inlet casing (06)
and the nozzle ring (07) and reaches the turbine (08). The LP turbine uses the energy con-
tained in the exhaust gas to drive the rotor. The exhaust gases then reach the atmosphere
through the gas outlet casing (05) and the exhaust gas pipe connected to it.
The rotor runs in two radial plain bearings, which are located between the compressor and the
turbine. The axial bearing is also in the form of a plain bearing. The plain bearings are con-
nected to a central lubricating oil duct which is normally supplied by the lubricating oil circuit of
the engine. The oil outlet lies at the deepest point of the bearing casing (09).
The LP compressor wheel (02) that is connected to the shaft sucks in fresh air or an air/gas
mixture through the filter silencer (01) or the air suction branch. The air is compressed in the
LP compressor and the downstream diffuser (03). The compressed air is passed on to the
intercooler (26) via the compressor casing (10). The air is cooled in the intercooler (26) and
subsequently supplied to the HP compressor (21).
© Copyright 2016 ABB. All rights reserved.
21
HP compressor
22
HP turbine
24
LP turbine
25
LP compressor
26
Intercooler
- - -
Not included in the ABB Turbo Sys-
tems scope of delivery
HZTL4061_EN
Page 5 / 59
Revision A
September 2016
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