Vacuum Ejectors

8/12/2019 Vacuum Ejectors

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EDS 2005/VE-1

Vacuum Ejectors

Training Services


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EDS 2005/VE-2

EDS-R00-3885

Steam Jet Ejector


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EDS 2005/VE-3

Lobe Type Positive DisplacementVacuum Pump

EDS-R00-3855


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EDS 2005/VE-4

Liquid Ring Pump Operation

EDS-R00-3856


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EDS 2005/VE-5

Liquid Ring

EDS-R00-3857


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EDS 2005/VE-6

Liquid Ring Pump Pressure Range

EDS-R00-3858

Single Stage

Two Stage

Ejector/Liquid Ring Combination

Two Stage Liquid Ring - Oil Sealant

1000

TORR

TORR100 50 10 5 1


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EDS 2005/VE-7

Liquid Ring Vacuum Pump

EDS-R00-3859


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EDS 2005/VE-8

Advantages of Ejectors Over OtherTypes of Vacuum Pumps

1. Low first cost

2. Economy of operation

3. Simplicity

4. Compactness

5. Durability

6. Dependability

7. Low installation cost

8. Low maintenance cost


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EDS 2005/VE-9

Ejectors CanHandle Corrosive,Toxic Fluids . . .


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EDS 2005/VE-10

EDS-R00-3861


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EDS 2005/VE-11

Two Stage Condensing with DirectContact Intercondenser

EDS-R00-3860

FirstStage

Second

Stage

Direct

Contact

Condenser

Cooling Water

and Condensate


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EDS 2005/VE-12

Steam Jet Ejectors

Operation

Control

Application

Utilities Consumption System

Problems


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EDS 2005/VE-13

Operation


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EDS 2005/VE-14

Ejector Operation

EDS-R00-3862


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EDS 2005/VE-15


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EDS 2005/VE-16

Ejector Characteristics

EDS-R00-3863


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EDS 2005/VE-17

Mollier ChartSaturated Steam Motive and Vapor Suction Fluid

EDS-R00-3864

P1 (Motive Pressure)

P3 (Suction Pressure)P5 (Discharge Pressure)

Enth

alpy

Entropy

P1

1P5

5 P3

3

4

2


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EDS 2005/VE-18

Stage Compression Ratio =

Compression Ratio is =

Ejector Discharge Fluid

Absolute Pressure

Ejector Load FluidAbsolute Pressure

~< 2.0 Non Critical Design

~> 2.0 Critical Design


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EDS 2005/VE-19

A Critical Design indicates that the velocity in

the mixing section of the ejector is supersonic

A Critical Design -

Has a standing wave

Has a relatively narrow range of operation

Is sensitive to the location of the nozzle relative

to the diffuser and the diffuser geometry

Is used for most process applications


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EDS 2005/VE-20

Ejector Characteristics

EDS-R00-3863


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EDS 2005/VE-21

Ejector Performance Curve

EDS-R00-3865


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EDS 2005/VE-22

Effect of Nozzle Positionon Performance Curve

EDS-R00-3866


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EDS 2005/VE-23

Control


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EDS 2005/VE-24

Ejectors Operate in Parallelfor Step Type Control and

for Sparing . . .


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EDS 2005/VE-25

Control by Throttling Inlet Vapor Line

EDS-R00-3867

Receiver


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EDS 2005/VE-26

Control by Additional Load Gas Throttling

EDS-R00-3868

Receiver


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EDS 2005/VE-27

Control by Recycling Interstage FlowBack to Suction

EDS-R00-3869

Receiver


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EDS 2005/VE-28

Application


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EDS 2005/VE-29

Ejector Application Information

EDS-R00-3870

1 micron 10 microns 100 microns 1 mm 10 mm 100 mm 1000 mm

Suction Pressure (Microns and mm Hg ABS)

3 Stage

1 mm to 25 mm

4 Stage

150 microns to 4 mm

5 Stage

20 to 300 microns

6 stage

2 to 100 microns

1 atmos.

2 Stage

10 mm to 100 mm

1 stage

75 mm to atmos.


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EDS 2005/VE-30

Single Stage ~ 50-75 mm Hg ABS

EDS-R00-3871


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EDS 2005/VE-31

Ejectors in Series GiveIncreased Compression

Ratio Capability . . .


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EDS 2005/VE-32

Two Stage ~ 10-100 mm Hg ABS

EDS-R00-3872


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EDS 2005/VE-33

EDS-R00-3873

Three Stage ~ 1-25 mm Hg ABS


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EDS 2005/VE-34

Sometimes a Booster isUsed for High

Compression Ratios . . .


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EDS 2005/VE-35

Four Stage ~ 150 Microns - 4 mm Hg ABS(1 Micron = 1/1000 mm)

EDS-R00-3874


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EDS 2005/VE-36

For Suction Pressure Below 4 to 5 mmHg ABS Ice Will Form on Steam -

Jet Ejector Nozzle

EDS-R00-3875


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EDS 2005/VE-37

Steam Jet Ejectors

Operation

Control

Application

Utilities Consumption

System

Problems


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EDS 2005/VE-38

Utilities Consumption


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EDS 2005/VE-39


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EDS 2005/VE-40

EDS-R00-3876


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EDS 2005/VE-41

Ejector Performance Curve Showing theEffect of Changes in Mol-wt

EDS-R00-3877


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EDS 2005/VE-42

EDS-R00-3878


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EDS 2005/VE-43

EDS-R00-3879


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EDS 2005/VE-44

Correction to Steam Rate for PercentNoncondensibles

EDS-R00-3880


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EDS 2005/VE-45

Steam Jet Ejector Consumption Chart

EDS-R00-3881


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EDS 2005/VE-46

System


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EDS 2005/VE-48

Condensate Removal Utilizing a Pump

EDS-R00-3882

C d t R l U i H t W ll


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EDS 2005/VE-49

Condensate Removal Using Hot Well

and Elevated Condensers

EDS-R00-3883


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EDS 2005/VE-50

Design Parameters

EDS-R00-3884


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EDS 2005/VE-51

(Duty) BTU/Hr

(8.33 #/Gal) (1 BTU /# F) (60 Min /Hr) (C.W. Rise, F) (.8)

(.8) Assumes utilization of 80% of total available rise

= GPM C.W.


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EDS 2005/VE-52

Problems


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EDS 2005/VE-53

Ejector Application Information

EDS-R00-3870

1 micron 10 microns 100 microns 1 mm 10 mm 100 mm 1000 mm

Suction Pressure (Microns and mm Hg ABS)

3 Stage

1 mm to 25 mm

4 Stage

150 microns to 4 mm

5 Stage

20 to 300 microns

6 stage

2 to 100 microns

1 atmos.

2 Stage

10 mm to 100 mm

1 stage

75 mm to atmos.


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EDS 2005/VE-54EDS-R00-3878


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EDS 2005/VE-55EDS-R00-3879

St J t Ej t C ti Ch t


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EDS 2005/VE-56

Steam Jet Ejector Consumption Chart

EDS-R00-3881

Vacuum Ejectors

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