Fig. 3: Power2 Lp Diagram - ABB Power2 850-M Operation Manual

Operation Manual / Power2 850-M / Low-pressure stage
1 Introduction / 1.5 Layout and function of the low-pressure stage
Mode of operation of the low-pressure stage (Power2 LP)
Fig. 3: Power2 LP diagram
Power2 Two-stage turbocharging
Power2 LP Low-pressure stage
Power2 HP High-pressure stage
A Exhaust gas inlet from internal combus-
tion 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 its main components are a tur-
bine and a compressor. These components are installed on a common shaft and form the ro-
tor.
In the low-pressure stage (Power2 LP) shown in the illustration
tion of the low-pressure stage
(Power2 HP) flows through the gas inlet casing (07) and the nozzle ring (08) and reaches the
turbine (09). The LP turbine uses the energy contained in the exhaust gas to drive the rotor.
The exhaust gases then reach the atmosphere through the gas outlet casing (06) and the ex-
haust gas pipe connected to it.
The rotor runs in two radial plain bearings (02/05). These are located between the com-
pressor and turbine and are guided in the bearing bush (04) and axial bearing (03). The plain
bearings are connected to a central lubricating oil duct which is normally supplied by the lub-
ricating oil circuit of the engine. The oil outlet lies at the deepest point of the bearing casing
(10).
The LP compressor wheel (12) 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 com-
pressor (12) and the downstream diffuser (11). The compressed air is passed on to the inter-
cooler (26) via the compressor casing (13). The air is cooled in the intercooler (26) and sub-
sequently supplied to the HP compressor (21).
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→8), the exhaust gas coming from the high-pressure stage
HZTL4062_EN
21 HP compressor
22 HP turbine
24 LP turbine
25 LP compressor
26 Intercooler
- - - Not included in the Turbo Systems
scope of delivery
(see Fig. 2: Layout and func-
Rev.E March 2022