Page 312 - Compression Machinery for Oil and Gas

Screw Compressors Chapter 6 297

TABLE 6.7 Examples of Single-Stage Dry Screw Compressors With Liquid
Injection
6
Nos. See Fig. 6.39 7 8 9
Process Styrene Styrene Lime kiln Steam
monomer monomer gas
Special feature High- High- High flow, High
pressure ratio, pressure high driver suction
high flow ratio power temperature
Driver Steam turbine Fixed Steam Variable
with speed speed turbine speed
reducing gear motor (direct motor
drive) 50%–100%
Liquid injection Demin water Demin Demin Demin
water water water
Shaft seal type Steam Double Combined Carbon ring
buffered DGS with labyrinth/ seal
carbon ring buffer gas carbon
seal to ring seal
process
Molecular 15.5 14.3 38.3 18.02
weight (kg/kmol)
Suction pressure 0.24 0.27 0.88 1.29
(bar abs)
Suction 36 34 40 107
temperature (°C)
Discharge 1.9 2.5 4.1 3.47
pressure
(bar abs)
Discharge 150 110 90 150
temperature (°C)
Suction volume 77,000 30,000 74,500 10,200
3
flow (m /h)
Driver rated 2260 1600 5880 690
power (kW)
The bold values are the more extreme condition or range of conditions and operation for these
machines.