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:MARAMA / ICACCurrent Topics in Mercury and Air Quality III – Measurement Methods
Dan Kietzer – SICK Process Automation
: SICK MAIHAK : Confidential
Gas sampling system
Heated sample gas line
Control Line
Exhaust air
Zero- and span gasBlow back airControl of main valveElectrical connections
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
High temperaturecell
Optical unit
Ejector
Sample gas line
Electronics
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
: Ejector
- Instrument air: 2500 l/h
- Flow rate: 300 l/h
- Flow rate sampling cell: 60 l/h
: Sample gas line
- 2 integrated tubes▪ Supply of sample gas▪ Supply of span gas (HgCl2)
- Recommended length: < 150 ‘
Connections
Sample gas line
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
High temperature
1000 °C
Sample gas outlet
= HgCl2
= Hg
Sample gas inlet
: High temperature conversion
- Heated quartz cell
(1000 °C)
- Double walled
HgCl2 + High temperature Hg0 + Cl2
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
MERCEM300Z – Design: optical unit
PEM andpolarizer
Detector
Hg – lightsource
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
253.64 253.65 253.660
0.2
0.4
0.6
0.8
1
Wellenlänge /nm
Ab
so
rptio
n,
rel.
Abs1000°
Hg
MERCEM300Z – Measuring principle
Absorption spectrum
elemental Hg
1000°C
II0
How todetermine theconcentration? Detector
Hg
I0 I
Measuring pathLight source
Reference signal Measuring signal
Absorp
tion
Conc ~ I0 / I
Atomic absorptionspectroscopy
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
B
s+s-
Photo elasticmodulator (50kHz)
Polarizer
Hg – light source
Detector
Absorptionspectrum Hg0
Light source
Chronologicaldifferentiation of thesignals: 2µs
Light waves of differentpolarization
Measuring principle
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
: Advantages of Zeeman - AAS
- Continuous measuring method
- No moving parts
No mechanical wear
Long-term stability
(Maintenance cycle of light source: ≥ 1 year)
- Automatic drift correction for
▪ Light source modifications
▪ Contamination of optical surfaces
- Identical influence of cross sensitivity components on measuring and reference signal
Best possible cross sensitivity correction
Bs+s-
Hg - Lichtquelle
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential
MERCEM300Z –Span Gas Generator
Span gasgenerator
Vaporizer
Sample gas line
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential MERCEM300Z 11
Test gasgenerator
Ejector
Ejector airExhaust gas
Sample probe
Sample gas line Filter
Nozzle
NozzlePressure controlfor flow control
Cell
Optics
Evaporator
1000°C
Cell
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential : Name (Date) 15
: Response time 130 sec w/ 100 ft sample line lengths
: Linearity within ± 1.5 % of full scale (10 µg)
:
: Lower detectable limit: 0.045 ug/m3
: Reproducibility: 0.2% of full scale (10 µg)
: Availability tested over 6 months: 97.5%
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential MERCEM300Z 16
: Integrated adjustment cell
- Generation of a defined, long-term stable Hg- signal
(patented) adjustment cell
- Automatic drift correction
- Optical adjustment
Adjustment cell
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential : Name (Date) 17
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
ug
/scm
Mercury Concentration
Stack Trap Stack CMM
Mercury CEM – Technology Advancements
: SICK MAIHAK : Confidential : Name (Date) 18
: Maintenance Interval Performance
- Weekly and Quarterly Maintenance
▪ Visual inspections
- Six (6) Month Maintenance
▪ Visual Inspections
▪ Clean Air Conditioner
▪ Replace Gas Generator Solution
- Yearly Maintenance
▪ Visual Inspections
▪ Check/replace probe filter
▪ Replace thermocouple in oven
▪ Replace lamp
: Maintenance Estimates
- < 10 hrs / month
- < $6000 / year in hardware
Mercury CEM – Technology Advancements
: Thank you for your attention.Dan KietzerBusiness Development Manager – SICK Process AutomationPhone: 763-205-5664 / Email: [email protected]