ejector

Block Diagram

T120

Filtate gas/liquid separator

Inlet Components

% Flowrate(kg/s)

Water 66.4 0.1928

Acetone 27.9 0.0810

Monomer 5.70 0.01655

Total 100 0.29045

Outlet Components

% Flowrate(kg/s)

Water 66.40 0.1535

Acetone 27.90 0.0644

Monomer 5.70 0.0132

Total 100 0.2311

Components to Ejector

% Flowrate(kg/s)

Air 90 0.05341

Acetone 10 0.00593

Total 100 0.05934

Ejector

Item Number P121

Description Ejector

Number Off 1

Dimns. rate or capacity 2.20 m 3/s

Analysis of material handled Mass %

Air 90%

Acetone 10%

Material Mild steel

Working pressure 4 bar g

0.2 bar abs

Working temp. degrees C 140

Services LP steam

Remarks

Block Diagram

Steam Jet Ejector

Dry air suction

Discharge to condensateHP steam

Calculation

1.0 Dry air suction

1.1 Determine the number of steam ejector stage

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.

202.491

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:


470.90 PPH dry air = 213.628 kg/hr

1 lb/hr = 0.4535927 kg/hr

5.90501

470.90 PPH

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 30Nominal Pipe Size, mm 200Inside diameter, mm 205.0Inside area, cm2 330.2Pipe suction diameter, in 8.0



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)


Piping size chosen:

Schedule 30Nominal Pipe Size, mm 300Inside diameter, mm 307.1Inside area, cm2 740.5Pipe suction diameter, in 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


Superheated steam velocity: 30 to 60 m/s

Schedule 30Nominal Pipe Size, mm 250Inside diameter, mm 257.4Inside area, cm2 520.5Pipe suction diameter, in 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.

ejector

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