Ejector

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:

5.90501 470.90 PPH

Source: Schutte&Koerting 470.90 PPH dry air = 213.628 kg/hr 1 lb/hr = 0.4535927 kg/hr

1.2

Determine the suction pipe diameter

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.