mercem300z intelligent mercury monitoring

MERCEM300Z Intelligent mercury monitoring

Florian Greiter, Produkt Management

: Florian Greiter, Product Management 2: SICK AG : Confidential

MERCEM300Z – Table of contents

: System components and measuring principle

: Test results and certification

: Summary


MERCEM300Z – Overall system

Gas sampling system

Heated sample gas line

Bundle of pipes

Exhaust air

Control of main valve

Electrical connections

: Our solution – high temperature


MERCEM300Z – Sample gas supply

Ejector

Sample gas line


MERCEM300Z – Gas flow diagram

CALSIC300

Ejector

Ejector airExhaust gas

Sample probe

Sample gas line Filter

Nozzle

NozzlePressure controlfor flow control

Cell

Optics

Evaporator

1000°C

Cell


MERCEM300Z – Sample gas supply

: MERCEM300Z Ejector principle

: Advantages:

- No moving parts- Wear-free- Flow control via pressure sensors- High gas flow results in short response time

: Benefits

Very low operating expenses Measuring certainty due to control Longest certified measuring gas line with 35m


MERCEM300Z - Design

High temperature cell


All optical measuring principles are based on the measurement of elemental mercury (Hg0) !

Conversion of mercury compounds (Hg+) to elemental mercury (Hg0)

- Wet chemistry: HgCl2 + SnCl2 -> Hg0 + SnCl4

- Thermo converter: approx. 200-400°C

- High temperature: from approx. 800°C

SICK: ~ 1000°C

MERCEM300Z – Hg - Conversion


High temperature

1000 °C

MERCEM300Z – Hg - Conversion

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


253.64 253.65 253.660

0.2

0.4

0.6

0.8

1

Wellenlänge /nm

Ab

sorp

tion

, re

l.

Abs1000°

Hg

MERCEM300Z – Measuring principle

Absorption spectrum

elemental Hg

1000°C

II0

How to determine the concentration?

Detector

Hg

Lichtquelle

I0 I

Measuring pathLight source

Reference signal Measuring signal

Abs

orp

tion

Wave length / nm

Conc ~ I0 / I

Atomic absorption spectroscopy


MERCEM300Z – Measuring principleZeeman Atomabsorptionsspektroskopie

B

+-

Photo elastic

modulator (50kHz)

Polarizer

Hg – light source

Detector

Absorption spectrum Hg0

Light source

Chronological differentiation of the signals: 2µs

Light waves of different polarization



: 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

B+-

Hg - Lichtquelle



: Influence of cross sensitivities; e.g. SO2

Absorption spectrum SO2

-0,50

0,00

0,50

1,00

1,50

2,00

2,50

3,00

3,50

200 210 220 230 240 250 260 270 280 290 300

Wave length

Ex

tin

cti

on

SO2

measuring wave lengths



0,00

0,05

0,10

0,15

0,20

0,25

0,30

253,6445 253,6455 253,6465 253,6475 253,6485 253,6495

Wave length

Ex

tin

cti

on

SO2







: Wave length of measuring and reference signal are almost identical

The interference caused by cross sensitivity components stays constant within the wave length interval!

Thus the cross sensitivity is immediately compensated.


0,00

0,05

0,10

0,15

0,20

0,25

0,30

253,6445 253,6455 253,6465 253,6475 253,6485 253,6495

Wave length

Ex

tin

cti

on

SO2




: Influence of cross sensitivities (results from type approval)

Component Concentration Cross sensitivities on Hg

SO2 1000 mg/m³ - 0.065 µg/m³

H2O 30 Vol% 0.060 µg/m³

HCl 200 mg/m³ no CS

NO 300 mg/m³ no CS

NO2 30 mg/m³ 0.090 µg/m³

O2 21 Vol-% - 0.120 µg/m³

All other tested cross sensitivities are below ± 0.05 µg/m³ = <0.5% certification range



: MERCEM300Z measuring principle: Zeemann AAS

: Advantages:

- Continuous measurement- No moving parts- Automatic drift correction- Best possible cross sensitivity correction

: Benefits

Easy design – Easy access, no black box

Very low operating expenses


MERCEM300Z – Patented extractive direct measurement

: MERCEM300Z: Patented extractive direct measurement- Measurement within heated cell of about 1.000 °C

: Advantages

- No Hg – recombination- No memory effects- Continuous monitoring of total Hg

: Benefits

- Reliable monitoring of total Hg independent

from plant conditions- Measuring certainty


MERCEM300Z – Internal adjustment

Optical unit


: MERCEM300Z Integrated Adjustment Cell- Generation of a defined long-term stable Hg - signal

with adjustment cell (patent pending)

: Advantages

- No test gas required- Automatic drift control- Full adjustment of optical bench

: Benefits

- Measuring certainty- Saves operational expenses due to drift control without test gas

MERCEM300Z – Internal adjustment


MERCEM300Z – Test gas generator

CALSIC300

Vaporizer Sample gas line


: CALSIC300 (option)

- Vaporization of liquid HgCl2-solution of known concentration

- Realization as automated span gas function- Three predefined span concentrations possible- Automatic injection before sampling filter unit

MERCEM300Z – Test gas generator


: MERCEM300Z – CALSIC300

: Advantages

- Adjustment of overall system- Fully automated QAL3 function included- Check of conversion rate included

: Benefits

- Measuring certainty due to check of overall system- Saves operational costs:

▪ No additional costs for test equipment, e.g. test gas, Hovacal ….▪ No additional costs for technician

MERCEM300Z – CALSIC300


MERCEM300Z – Adjustment during field test

High

Middle

Low

Adjustment cell


: MERCEM300Z System housing

: Advantages

- Standardized setup- Easy to maintain- Full air conditioning (-20 to +50°C)- Protection grade IP55- Dimensions: H W D

1800mm x 1050mm x 745mm

- Weight: approx. 250 kg

: Benefits

- Convenient and fast access for easy service- Stable measuring results in harsh and/or difficult ambient conditions

MERCEM300Z – Cabinet


MERCEM300Z - Design

High temperature cell

Optical unit

Ejector

Electronics

CALSIC300





: Summary


MERCEM300Z – Certification


MERCEM300Z – Type approval

: Type approval according to EN15267

- Approved measuring ranges: 0-10/45/100/1000 µg/m³

- Lowest approved measuring range for mercury analyzer: 0 – 10 µg/m³- Highest approved measuring range for mercury analyzer: 0 – 1000 µg/m³

- Unique maintenance interval: 6 months!

- Unique type approved system which is certified to monitor mercury at all relevant

plant types (waste incineration, power plants and cement plants)

: Successful implementation of system at 3 plants where no other mercury monitoring system could be calibrated

- Cement plant (Germany)- Lime plant (Rheinkalk) Germany- Sinter metal plant


MERCEM300Z – Type approval


Raw gas monitoring: waste incineration plant

: Raw gas monitoring at a waste incineration plant

: Hg- Concentrations between 500 µg – 4000 µg

: No change in system setup

: Uninterrupted operation since 4 months

Adjustment with internal CALSIC300





: Summary


MERCEM300Z – Summary

MERCEM300Z

Features

:Precise measurement of “total mercury”

directly in a thermal converter (patented)

:Measuring operation without using consumables

:Very low maintenance gas sampling using

an ejector pump – no moving parts

:Integrated adjustment cell for automatic drift

correction

Benefits

Reliable results of the actual measuring

values of elemental Hg and Hg-

compounds in gases

Very low operating expenses

Minimum maintenance expenditure

Long-term stability without the need of a

technician due to self – adjusting

measuring system


MERCEM300Z – Summary

MERCEM300Z

Features

:Automatic adjustment of the entire

measuring system with a built-in test gas

generator (optional)

:Modular design with the entire system

:Rugged housing for use in harsh industrial

environments

Benefits

Measuring certainty using the fully

automated adjustment with test gas

Convenient and fast access for easy

service and user-friendly remote diagnosis

Stable measuring results in harsh and/or

difficult ambient conditions


MERCEM300Z – Questions ?

MERCEM300ZInnovative mercury monitoring

mercem300z intelligent mercury monitoring

Documents

sick ag

c sick

produkt management

product managementdiagramm20

confidential mercem300z

optical measuring principles

c high temperature

solution high temperature