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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


High temperaturecell

Optical unit

Ejector

Sample gas line

Electronics



: 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



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



MERCEM300Z – Design: optical unit

PEM andpolarizer

Detector

Hg – lightsource



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



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



: 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



MERCEM300Z –Span Gas Generator

Span gasgenerator

Vaporizer

Sample gas line


: 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


: SICK MAIHAK : Confidential : Name (Date) 12



: 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%


: 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



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



: 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


: Thank you for your attention.Dan KietzerBusiness Development Manager – SICK Process AutomationPhone: 763-205-5664 / Email: [email protected]

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