ACADs (08-006) Covered Keywords Air compressors, aftercooler, afterfilter, moisture separator...
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Transcript of ACADs (08-006) Covered Keywords Air compressors, aftercooler, afterfilter, moisture separator...
ACADs (08-006) Covered
KeywordsAir compressors, aftercooler, afterfilter, moisture separator airflow.
Description
Supporting Material
Service and Instrument Air
5.2.2.9
Service&
InstrumentAir
2
Objectives:
5
1. Describe the difference between service air and instrument air; state the purpose of each.
2. List the main components of the service / instrument air systems and describe their functions.
3. Describe the flowpath of air through the service / instrument air system using a one-line diagram.
Service & Instrument Air
Purpose: Provide a source of reliable compressed
air to air operated plant equipment.
Uses: Service air is generally of lesser quality than instrument air. Service air is piped to outlets for temporary equipment and instrument air is piped to permanently-installed, pneumatically-operated equipment.
6
Rotary Air Compressor: Turbine Building Level A
7
a. 2 per unit
b. Normal operating pressure 117 psig
c. Capacity - 750 SCFM
d. 200 HP motor
e. Seal fluid seals the intermesh of two screw-type blades
f. Air coolant receiver - cools seal fluid, removes fluid, and returns it back to screws
Reciprocating Air Compressor
8
a. 1 per unit, 1 shared
b. Normal operating pressure 125 psig
c. Capacity 885 SCFM
d. 200 hp motor
e. Piston and cylinder type
f. Uses no seal fluid therefore no air coolant receiver needed
Aftercooler
9
•Compressed air gets hot so must be cooled•7 (1 for each compressor)•Air/water Heat Exchanger•Air on shell side•Cooling water on tube side•Cooling water from Turbine Plant Closed Cooling Water (TPCCW)
Moisture Separator
10
a. 7 (1 per compressor)b. Mechanical type -- air flow hits baffles inside and drops water outc. Removes condensed moisture from cooled air
1st & 2nd Stage Contaminant Filters
11
a. Used with rotary compressor
b. Backup seal oil removal
c. 1st stage = .3 micron2nd stage = .01 micron
Air Receiver
12
•7 (1 per compressor)•150 ft. 3•Rated pressure 150 psig•Dampening effect
Prefilter
13
•3 total
•Coalescing type (oil vapor/particulate)
•Removes oil and contaminants before dryer
Air Dryer
14
Each dryer = two tanks w/ alumina desiccant
Service Dryer:• 1 dryer• 1200 SCFM
capacity
Instrument Dryer:• 2 parallel dryers • 740 SCFM
capacity
Afterfilter
15
• 3 (1 after each dryer)
• Filter desiccant fines
• Remove .07 micron
Service& InstrumentAir
Intake Filter
Air Compressor(Rotary)
Air CoolantReceiver
After Cooler
MoistureSeparator
ContaminantFilter
FirstStage
SecondStage
AirReceiver
LCV
LCV
Drain
Drain
Intake Filter
Air Compressor(Rotary)
Air CoolantReceiver
After Cooler
MoistureSeparator
ContaminantFilter
FirstStage
SecondStage
AirReceiver
LCV
LCV
Drain
Drain
Intake Filter
LCV
Drain
MoistureSeparator
After Cooler
AirReceiver
LCV
Drain
Air Compressor(Reciprocating)
Intake Filter
LCV
Drain
MoistureSeparator
After Cooler
AirReceiver
LCV
Drain
Air Compressor(Reciprocating)
ToUnit 2
To AirDryer
FLOW PATH:1. Compressors2. Aftercooler3. Moisture separator4. Contaminant filter5. Air receiver
3
1
1
53
2
2
2
2
1
1 5
3
3 5
5
4
4
16
Service & Instrument AirF
F
F
F
F
F
To ServiceAir Header
To OtherUnit
To InstrumentAir Header
CompressedAir Inlet
ServiceAir Dryer
InstrumentAir Dryer "A"
InstrumentAir Dryer "B"
Exhaust
Exhaust
ExhaustExhaust Exhaust
Exhaust
FLOW PATH:6. Pre-filter7. Dryer8. After Filter9. To respective headers
9
6
6
6
7
7
7
9
8
88
17
Objectives Review:
18
1. Describe the difference between service air and instrument air; state the purpose of each.
2. List the main components of the service / instrument air systems and describe their functions.
3. Describe the flowpath of air through the service / instrument air system using a one-line diagram.