The vapor jet ejector cooling cycle driven by waste heat. It is a very auspicious approach of producing ‘free cooling’ by utilizing low-grade energy sources. The mechanism behind the ejector-based ...
Block Diagram
Inlet % Components Water 66.4
Flowrate (kg/s) 0.1928
Acetone
27.9
0.0810
Monomer
5.70
0.01655
Total
100
0.29045
T120 Filtate gas/liquid separator
Components % to Ejector Air 90
Flowrate (kg/s) 0.05341
Acetone
10
0.00593
Total
100
0.05934
Outlet % Flowrate Components (kg/s) Water 66.40 0.1535 Acetone
27.90 0.0644
Monomer
5.70
0.0132
Total
100
0.2311
Ejector Item Number
P121
Description
Ejector
Number Off
1
Dimns. rate or capacity
2.20 m 3/s
Analysis of material handled Mass %
Air
Material
Mild steel
Working pressure
4 bar g
90%
Acetone 10%
0.2 bar abs Working temp. degrees C
140
Services
LP steam
Remarks
Block Diagram Dry air suction
HP steam
Steam Jet Ejector
Discharge to condensate
Calculation 1.0
Dry air suction 1.1
Determine the number of steam ejector stage
202.491
Source: Schutte&Koerting Suction pressure given: 0.2 bar abs : 202.491 mm Hg abs : 5.90501 in Hg abs From the graph given, the one stage of steam jet ejector has been chosen.
Suction temperature: ambient, 25o C Air density at ambient temperature and 0.2 bar abs: 0.131 kg/m3 Air suction capacity: 213.628 kg/hr From graph below:
Volumetric flow rate = 213.628 kg/hr ÷ 0.131 m3/kg =1630.74 m3/hr From the data Petronas Technical Standards PTS 31.38.01.11, November 2002 Preliminary piping size, velocities for air and other gases = 10 to 20 m/s Piping size chosen: Schedule Nominal Pipe Size, mm Inside diameter, mm Inside area, cm2 Pipe suction diameter, in
Source: Schutte&Koerting
30 200 205.0 330.2 8.0
Source: Schutte&Koerting Use reducer to reduce the 8” to 6” suction connection of steam jet ejector.
2.0
Discharge to condensate 2.1
Discharge rate given: 2.20 m3/s (7920 m3/hr)
Temperature: 25oc Pressure: 1atm Superheated steam velocity: 30 to 60 m/s (Source: Petronas Piping Guide) From the data Petronas Technical Standards PTS 31.38.01.11, November 2002 Piping size chosen: Schedule Nominal Pipe Size, mm Inside diameter, mm Inside area, cm2 Pipe suction diameter, in
30 300 307.1 740.5 12.09”
Use reducer to reduce the 12” to 6” discharge connection of steam jet ejector.
3.0
HP steam flow rate 3.1
Mass balance = 7920m3/hr – 1630.74m3 /hr = 6289.26 m3/hr
From the data Petronas Technical Standards PTS 31.38.01.11, November 2002 Superheated steam velocity: 30 to 60 m/s Schedule Nominal Pipe Size, mm Inside diameter, mm Inside area, cm2 Pipe suction diameter, in
30 250 257.4 520.5 10”
Use reducer to reduce the 10” to 3” steam connection of steam jet ejector.
The size in inches chosen for the design is 6” based on the calculation.
