EGA Technical World Leaders in Combustion Management Solutions Mk7 EGA

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World Leaders in Combustion Management Solutions

Mk7 EGA

EGA Technical

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• 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)


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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


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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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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

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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

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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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)


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EGA Technical World Leaders in Combustion Management Solutions Mk7 EGA