ega technical world leaders in combustion management solutions mk7 ega
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EGA Technical
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World Leaders in Combustion Management Solutions
Mk7 EGA
EGA Technical
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World Leaders in Combustion Management Solutions
• Sampling and display• O2, CO2, CO, NO and
SO2 or NO2• Exhaust temperature• Combustion efficiency
• 3 parameter trim• O2, CO2, CO
• Limits• O2, CO2, CO, NO and
exhaust gas temperature
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Door Hinge & Key Lock EGA
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Standalone / Trim Function DataEmissions levels can be accessed via:
• 10.4” Touch screen display
•Micro Modulation unit
•Six 4-20mA signals
•Data Transfer Interface (DTI & CEMS monitoring)
•PC (personal computer)
•BMS (building management system)
World Leaders in Combustion Management Solutions
EGA Technical
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1. Improve combustion
2. Increase efficiency
3. Reduce fuel consumption
4. Reduce Cost- up to 2% has been recorded
5. The most important reason-
IMPROVED SAFETY
World Leaders in Combustion Management Solutions
EGA Technical
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EGA 3 parameter trim
• O2, CO2 and CO
• Trims because of fluctuations in ambient conditions
• Variations in stack pressure or barometric conditions or small changes in gas pressure/BTU content
• Minute corrections to the air damper
• Or minute corrections to the fan speed drive
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SENSOR SERVO
SECOND SETPOINT FACILITYEXTERNAL MODULATION
SWITCH
EXTERNAL
BOILER
DRIVECH.5SPEEDVARIABLE FLAMEOR
DRAFTFORCED AUX.
SERVO
CH.4AIR AUX.
SERVOSERVO
CH.3CH.2U.V
LOAD OR
OIL
AIRPRESSURE
PRESSURESENSOR
OIL
CH.1
FUEL
PRESSURESENSOR
GAS
GAS
HIGH/LOW GASPRESSURE PROVING
VALVE PROVING
SENSOR
PROBESAMPLING
FLUE
EXTERNAL
STEAMSENSOR
OUTSIDETEMP. SENSOR
3% O2
10% CO2
0ppm CO
3% O2
10% CO2
0ppm CO
O2 trimsystem
3% O23% O2
10% CO2
0ppm CO
Vs.
5% O2
7 % CO2
0ppm CO
5% O2
1% O2
11.5% CO2
10000ppm CO
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EGA Technical
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Problems with O2 trim
1.If only O2 is measured and trimmed on then there is no measurement as to what the CO or NOx readings are
2.O2 readings seem correct but what is actually happening?
•Changes in ambient conditions can cause the CO to rise significantly (>>100ppm) even though the O2 reads well- O2 trim does not correct
•Leaks through the boiler- small gaps in the boiler shell (around joints) can lead to increased air being induced into the boiler
•Higher O2 readings from atmosphere so the system starts to trim, even though the combustion may be fine
•Combustion becomes unstable and dangerous
•CO levels (>>500ppm), higher NOx levels, O2 readings correct
•Actual combustion O2 readings around 0-0.5%- very dangerous!!
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Quick Trim
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0
1
2
3
4
5
6
7
25% 50% 75% 100%
O2commissionedO2 offset
Absolute
0
20
40
60
80
100
120
140
160
25% 50% 75% 100%
COcommissionedCO offset
Absolute
0
10
20
30
40
50
60
25% 50% 75% 100%
NOcommissionedNO offset
Absolute
0
100
200
300
400
500
600
700
25% 50% 75% 100%
TempcommissionedTemp offset
Absolute
Limits of Combustion
EGA Technical
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World Leaders in Combustion Management Solutions
SENSOR SERVO
SECOND SETPOINT FACILITYEXTERNAL MODULATION
SWITCH
EXTERNAL
BOILER
DRIVECH.5SPEEDVARIABLE FLAMEOR
DRAFTFORCED AUX.
SERVO
CH.4AIR AUX.
SERVOSERVO
CH.3CH.2U.V
LOAD OR
OIL
AIRPRESSURE
PRESSURESENSOR
OIL
CH.1
FUEL
PRESSURESENSOR
GAS
GAS
HIGH/LOW GASPRESSURE PROVING
VALVE PROVING
SENSOR
PROBESAMPLING
FLUE
EXTERNAL
STEAMSENSOR
OUTSIDETEMP. SENSOR
3% O2
10% CO2
8ppm CO
3% O2
10% CO2
8ppm CO
3% O2
10% CO2
8ppm CO
1% O2
11.5% CO2
10000ppm CO
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EGA Values on Home Screen
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EGA Sampling Screens on Mk7
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EGA Sampling Screens on Mk7
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EGA Sampling Screens on Mk7
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EGA Technical
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45 DEGREES
INCORRECT CORRECT
SAMPLE TUBESAMPLE TUBE
PROBEPROBE Tubing
•Maximum length- 10m
•Diameter- 2mm
•No lower points
Probe positioning
•450 angle into flue
•Check for leaks
•1.5” BSP socket
•Error 20- tube blockage
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EGA Sampling Probe
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E.G.A. Positioning
•10m to sampling probe
•Cool environment (410F – 1040F (50C – 400C))
•Exhaust gases - where do they go?
•Avoid re-calibrating on contaminated gases
Chilled EGA Enclosure (EGAENC)
•Non-standard ambient conditions
•Extreme environments
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Chilled EGA Enclosure (EGAENC)
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Options• 12- E.G.A. setup
• 19/20/21- upper offset limits % O2, CO2: ppm CO
• 22/23- lower offset limit % O2, CO2
• 25/26/27- absolute value % O2, CO2: ppm CO
• 28- trim threshold• 32 – trim delay
• 36- sensor selection for NO, SO2, NO2 cells
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Error codes on MM display
• 01- no communications to the EGA• Check wiring• Is the system grounded?
• 20 - pump failure• Sampling blockage- check inlet to E.G.A.• Isolation of each section
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Error codes on MM display
• 21- O2 cell failure• Check voltages• Re-calibration• Are there any leaks on the tubing (pinch valves)?• Parameter 10
• O2 cell reads 20.9% • Check all the tubing is airtight• Is the sample tube blocked?• Air solenoid?• Leak on flue?
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Error codes on EGA display
• RH too high• 100% Relative Humidity• Wet sample• Cold conditions• Parameters 25, 26• External particulate filter
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Levels of repair/service1- Minor repair/service
• Cleaning, testing and re-calibration• New pump, tubing plus cells if required
2- Significant repair• Plus replacement of damaged components,
cells, etc.
3- Service exchange• Replacement of E.G.A. for a fully repaired,
tested and calibrated unit
4- Beyond Economical Repair (BER)
World Leaders in Combustion Management Solutions
EGA Technical
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EGA Technical
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World Leaders in Combustion Management Solutions
Thank you for listening.Thank you for listening.