ADX SOLUTIONS

Vacuum Heat Regen Desiccant Air Dryer

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Xebec Overview & Introduction

Fundamentals of Desiccant Air Drying Technology

Vacuum Heat Regen (Zero Purge) Desiccant Air Dryer

Maintenance of Vacuum Heat Regen Desiccant Dryer

SCOPE

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Note : The information in this presentation is confidential & is meant for M+W &

Medtronic Singapore internal use only, & must not be given to any 3rd party company

without the written permission from Xebec Adsorption South East Asia Pte Ltd.

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Xebec South East Asia Facility

(Top left): Company Service Vans

(Above): Singapore Sales Office with area

over 4500 sq ft

(Bottom left): Xebec Dryer

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Fundamentals of Desiccant Air

Drying Technology

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WHY TREAT COMPRESSED AIRA compressor takes in atmospheric air that is loaded with moisture, dirt, dust

fibers and bacteria. Due to constant use, wear & tear, most compressors deliver

large amounts of oil fumes along with compressed air. The hot air delivered by a

compressor carries contaminants which cause corrosion, excessive wear,

malfunction and ultimately failure of your compressed air components, tools and

system. To assure a reliable and efficient operation of a plant, these

contaminants must be removed.

TO COMPRESSED

AIR SYSTEM

AIR

COMPRESSOR RUST

190M particles/m3

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The air loaded with moisture,particles and oil is

purified by means of filtration and drying.

filtered are:

Solid particles &

coalescing components

dried are :

all vapour phase components

Fundamentalson purification of compressed air

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58.3

17.5

4.50

0.76

0.10-40 -20 0 20 40

Wa

ter

vap

ou

r co

nte

nt

g/m

³

Dew point °C

filtration

condensation

adsorption

Fundamentalson water separation and drying

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n Adsorbents

with fine pores

inner surface area

up to 1000 m² /g

n Adsorbents types

- Molecular sieve

- silica gel

- activated alumina

Fundamentalsstructure of the desiccant

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FundamentalsRegeneration - Heatless

Loading time after each load situation

tB = 3 - 5 min. Adsorption of moisture

on external desiccant surface.

Regeneration without heat supply instead with a partial

flow (typically 15%) of already dried and expanded

compressed air in the counter current direction.

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FundamentalsRegeneration - Heated

Loading time after each load set-up

tB = 4 - 8 h. Adsorption of moisture on

external surfaces and internal pores

of desiccant beads.

Regeneration with externally heated air in order to

evaporate the moisture that is accumulated deep in the

pores. The regeneration medium carrys the moisture out

from the desiccant & is exhausted out of the plant room.

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nAdsorption and

desorption take place

simultaneously at

the same timeA

dso

rpti

on

Deso

rpti

on

nAdsorption drying

requires two vessels,

filled with an adsorbent

(drying agent)

FundamentalsAdsorption - Desorption

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Vacuum Heat Regeneration

(Zero Purge) Desiccant Air Dryer

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Energy Costs on the Rise Again11July08 @ US$147

Current

US$72

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Electricity Tariff on the Rise Again

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Vacuum Heat Regen (Zero Purge) Dryer

Can Help Companies to Save Energy!

Does not use valuable

compressed air for regeneration of

desiccant

Ambient air is used for both the

heat regeneration cycle & cooling

cycle

Autodew control for Dewpoint

Dependent Switching (DDS) to

maximize energy savings

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SS desiccant bed support for effective air flow distribution

External heater (low watt density type for long life span)

Reliable vacuum pump of continuous duty type

Intensive closed loop cooling option (Zero Purge) for countries

with high humidity)

Siemens PLC control – monitors all critical operating

conditions

Characteristics of Xebec Vacuum Heat Regen Dryer

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Heat Regen Cycle (Right Chamber)

Wet

Air in

CDA out

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Cooling Cycle (Right Chamber)

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Re-Pressurization (Right Chamber)

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Heat Regen Cycle (Left Chamber)

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Cooling Cycle (Left Chamber)

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Re-Pressurization (Left Chamber)

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Adsorption

Range (20 to 60°C)

Desorption

Range (160 to 200°C)

Transition

range (70 to 80°C)

After the heating

and before switch over

from

desorption to

adsorption,the desiccant

bed must

be cooled to

approx. 60°C,

to avoid a heat and

pressure dewpoint spike.

0

50

10

0

150

20

0

Te

mp

era

ture

°C

Adsorption / Desorption Information

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Major Component – Switching Valves

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High performance butterfly valve

For 2” and larger valves requirement

Inlet and Regen Exhaust Valves

Double or Single acting rack &

pinion actuator for long life &

precise operation

Full face sealing mechanism

for long life

Features SS Disc

Carbon Steel Body

Switching Valves

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Major Component – External Heater

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Flanged immersion heater

Low watt density type (for long life span)

Incoloy* sheath element

Insulated heater housing

Temp dependent Regeneration cycles

Adequate regeneration is confirmed by

actual regen air outlet temperature, not

simply by a timer

External Electric Heater

* Alloy which combines good strength with excellent

resistance to oxidation & carbonization under high

temperature conditions

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Vacuum Pump

Quiet operation

Totally enclosed fan cooled

housing

Sized for required regen vacuum

pressure and maximum required

regen flow rate

Brands of Vacuum Pump may

varies

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User Interface/Text DisplayOPERATOR INTERFACE

F1 => DRYER STATUS

F2 => MANUAL STEP AHEAD (MANUAL MODE ONLY)

F3 => DRYER ALARM STATUS

F4 => ALARM RESET

SHIFT=> In order to choose one of the next four options, the SHIFT

button must be pressed first. An “s” in the lower right corner

indicates the upper row is now active.

F5 => DRYER OPERATING MODE MENU

F6 => HEATER SHEATH TEMPERATURE AND SETPOINT

F7 => HEATER OUTLET TEMPERATURE AND SETPOINTS

F8 => REGEN. OUTLET TEMPERATURE AND SETPOINTS

ARROWS ALLOW USER TO SCROLL UP OR DOWN INSIDE OF DISPLAY. A FLASHING ARROW ON THE RIGHT SIDE OF THE SCREEN INDICATE THAT MORE INFORMATION IS AVAILABLE IN THE DIRECTION OF THE ARROW AND CAN BE ACCESSED BY USING THE SCROLL ARROWS.

ESC => ACCESSES THE MENU MODE.

ENTER=> TO CONFIRM THE COMMAND.

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Maintenance of Vacuum Heat

Regeneration Adsorption Dryer

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Daily Maintenance

• Unusual noises

• Check for any alarm

• Check dewpoint

• Check inlet pressure & temperature

• Check that filter condensate drain is working

• Check drain pipe for blockage

Visual Check

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Weekly Maintenance

• Check Filter’s differential pressure indicator. If in

region of 8~10 psi indicates that element is dirty &

should be replaced

•Inspect inlet suction filter & clean or replace if

clogged, dirty or damaged

Visual Check

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Monthly Maintenance

• Check silencers/mufflers on dryer and

replace if clogged or dirty

• Check dryer operation cycle for proper

operation of butterfly valves & solenoid

valves.

• Check if heater outlet temp is between 350

degF & 450 degF (Press Shift F7)

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Annual Maintenance• Replace the suction inlet filter

• Replace elements of Pre, After-filters &

Final air filter at least once a year

• Disassemble, clean & inspect all check

valves (if possible)

• Calibration of Autodew sensor

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Thank you for your attention.

Any Questions ?

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