02_Compressed_Air_Pollution_120315 (2).pptx

7/29/2019 02_Compressed_Air_Pollution_120315 (2).pptx

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Compressed Air System Pollution

Compressed Air Purification

Product Line Industrial Filtration TechnologyStatus: March 2012

Product Training


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Atmospheric Pollution

Nitrogen78%

Oxygen21%

Other gases1%

Ambient air does not only consist of.

You will also find

Why is compressed air purification needed?

2


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Atmospheric Pollution

3

.Pollution!


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Particles and Aerosols

0,01 0,1 10 1001 10000,001

Viruses

Particle Size [ m ]

Vapour, fumes, smoke Dust Mist Spray

10000

Droplets, Grains

Bacteria Drifting Sand

Gas Molecules Flour

Grains of Salt Pollen

Dried Milk Spores

Pigments Human Hair

Soot Cement Dust

Tobacco Smoke Coal Dust

Oil Vapor Water Clouds

Perceptible under microscope Visually PerceptibleSubmicroscopic Perceptible

Atmospheric air can contain 150 Mio. particles per m.

80% of these are < 2m and are not retained by a

compressor suction filter!4


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Gaseous Components

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Pollution

Typical

concentrationrange Main source

Carbon dioxide

(CO2)6002000 mg/m

Internal combustion

engines and combustion

processes in industryand energy production

plants

Carbon monoxide

(CO)150 mg/m

Nitrogen oxide

(NOX NO, NO2)0,010,08 mg/m

Sulphur oxide

(SO2)0,0020,01 mg/m

Ammonia

(NH3) 0,020,05 mg/m Agriculture, biogas

Ozone

(O3)0,030,1 mg/m

Develops from precursors like

NOX or NMVOC (non-methane

volatile organic compouns)

through photochemical

processes


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Humidity, Water Vapor, Dewpoint

Water vaporis always invisible do not mistake vapor for fog ormist

Fog/mist = fine droplets of water in the atmosphere near or incontact with the earth

Aerosol = Suspension of solid particles or liquid droplets in a gas

Atmospheric airalways

contains a certain amount

of water vapor

6
http://geochristian.files.wordpress.com/2008/08/watervapor_amr_2008181.jpg


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Humidity, Water Vapor, Dewpoint

Atmospheric air is a composition of several gases + water vapor.

Percentage portion of each component

depends e.g. on the water vapor content

Water vapour

content at25C

70% R.H7


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Oil Liquid / Aerosol / Vapor

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Oil injected screw compressor

Oil carry over

3mg/m

Intake air

Compressed air + oil

Compressed air 70 to 100C

Compressed air ambient +10C

Oil

Condensate

Oil carry-over to compressed air system depending on: Type of compressor (e.g. piston, screw, oil-free)

Efficiency of air/oil separator

Compressor age and condition

Type of oil (mineral, synthetic)


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Oil Liquid / Aerosol / Vapor

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How oil free is the air from oil free compressors?

Ambient air contains some hydrocarbons. The concentration

vary, based on the location:

AmbientAverage

(mg/m)

Quality Class acc.

to ISO8573-1Rural < 0.001 1 (0)

Sub urban 0.01 1

Light industrial 0.01-0.03 1-2

City 0.01-0.10 2

Industrial area with major hydrocarbon industry 0.1-0.2 2-3

Even oil-free compressors need purification to

remove hydrocarbons, water and particles


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System Pollution

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SO2

NH3CO

CO2O3

VOCNOX

H2O

Particles

SO2

NH3

CO

CO2

O3

VOC

NOX

CO2

NH3

NOX

VOC

VOC

Compressed Air

Compressor

Atmospheric Air

Atmospheric Concentration 8 x Atmospheric Concentration

+ H2OAgglomerationAcids + Bases

Bacteria

at 8bar abs pressure:at 1bar abs pressure:


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System Pollution

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Corrosion + contamination

Material damage

Production downtime

High maintenance cost

High operating cost (p)

Creation of scrap

New equipment required

Without Filtration + Purification


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Compressed Air Purification

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Oil (vapor)Hydrocarbons

ParticlesOil

(aerosol)

Water

(liquid)

Water

(vapor)Other gaseous

contaminants

Particulate

Filter

Coalescence

Filter

Activated

Carbon

Filter

Adsorber

Cooler

Separator

Dryer System

Solution

(e.g. ALG)


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Questions ?

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02_Compressed_Air_Pollution_120315 (2).pptx

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