tlg-837 tail gas / air demand analyzer

APPLIEDA N A L Y T I C S

TM

[1] DS-004A TLG-837 Tail Gas Air Demand Analyzer

The worldrsquos safest tail gas analyzer

The TLG-837 continuously measures the chemical concentrations of H2S SO2 COS and CS2 in the Claus process tail gas stream Using the patented in situ DEMISTER sampling probe and a full-spectrum UV-Vis spectrophotometer this system provides extremely fast accurate response for tight process control

Features

raquo Continuously measures concentrations of H2S and SO2 and outputs Air Demand signal (user-defined formula)

raquo Patented DEMISTER sampling probe with internal sulfur vapor removal

raquo Totally solid state with no moving parts sample lines or heat tracing mdash modern design for low maintenance

raquo Ultra-safe fiber optic design mdash no toxicexplosive sample gas in analyzer enclosure

raquo Superior Off-Ratio range ( 1001 lt H2SSO2 ratio lt 120 )

H2S

red = optional analyte

SO2 COS CS2

TLG-837 Tail Gas Air Demand AnalyzerApplied Analytics Data Sheet No DS-004A

[2]

Applied Analytics Data Sheet No DS-004A

TLG-837 Tail Gas Air Demand Analyzer

DS-004A TLG-837 Tail Gas Air Demand Analyzer

The Claus Process Analysis Need

The sulfur recovery unit (SRU) of a refinery is dedicated to processing the H2S stripped from the hydrocarbon fuel through a series of operations that convert it into water and harmless elemental sulfur which can be sold and repurposed

The Claus process is the industry standard for treating the H2S-rich ldquosourrdquo gas In the reaction furnace H2S is combusted

3H2S + 32O2 SO2 + H2O + 2H2S

A catalytic converter reacts the products of the combustion to create elemental sulfur in it various crystalline forms

2H2S + SO2 2H2O + 3XSX

As can be deduced from the 2nd reaction above the typical Claus reaction runs most efficiently when the stoichiometric ratio of H2S to SO2 is controlled at 21 The reactions above demonstrates that this ratio is controlled by adjusting available oxygen

The efficiency of sulfur recovery therefore hinges on the ldquoAir Demandrdquo signal which informs the oxygen adjustment in the DCS The Air Demand is calculated by multiplying the expression (2[SO2] - H2S) by a scaling factor Obtaining the real-time Air Demand value requires continuous reliable measurement of the H2S and SO2 concentrations in the Claus tail gas Additionally COS and CS2 levels in the tail gas can be indicators of reduced efficiency or potential catalyst issues

In the diagram below the tail gas analysis point is identified by AT6

[3]




TLG-837 Principle of Operation

xenon light source

holographicgrating

diode array

fiber optic cables

flow cell disk

o-ring

collimator

cooling extension

steam tracing

The TLG-837 measurement cycle is instantaneous but it can be helpful to visualize it in stages

(1) The white light signal originates in the pulsed Xe lamp that functions as the light source

(2) The signal travels via fiber optic cable to the flow cell A collimator narrows the light beam

(3) The signal travels directly across the flow cell interacting with the continuously drawn process sample

(4) The signal exits the flow cell through a collimator now containing the distinct absorbance imprint of the current chemical composition of the sample

(5) The signal travels via fiber optic cable to the nova II

(6) The signal is dispersed by the holographic grating Each differentiated wavelength is focused onto a designated photodiode within the diode array The nova II provides this rich data to the HMI for real-time visualization of the absorbance spectrum

human machine interface (HMI)

nova IItrade spectrophotometer

IO board

powersupplies

circuitbreakers

[4]




Analyzer Internal Components

ECLIPSEtrade Software User Interface

Normal Runtime Real-time concentration data is displayed on the home screen

Auto Zero Runs on custom schedule to normalize the spectrophotometer readings on zero-absorbance fluid



DS-004A TLG-837 Tail Gas Air Demand Analyzer[5]

[6]




Technical DataGeneralMeasurement Principle Dispersive UV-Vis absorbance spectrophotometryDetector nova IItrade Spectrophotometer

Data sheet httpwwwa-a-inccomdocumentsAA_DS201A_novaIIpdfSpectral Range 200-800 nmLight Source Standard pulsed xenon lamp with average 5 year lifespanFiber Optic Cables Standard 600 μm core 18 meter fiber optic cables (qty = 2)

Data sheet httpwwwa-a-inccomdocumentsAA_DS206A_FiberOpticspdfSample Introduction DEMISTER in situ sampling probe

Data sheet httpwwwa-a-inccomdocumentsAA_DS004B_TLG837_ProbepdfAnalyzer Calibration One-time calibration at factory or site with certified calibration gas Auto Zero normalizes

spectrophotometer reading on zero-absorbance fluidReading Verification Simple verification with sample gasHuman Machine Interface Applied Analytics standard HMI industrial controller with touch-screen LCD display

Data sheet httpwwwa-a-inccomdocumentsAA_DS202A_HMIpdfUser Interface ECLIPSEtrade Runtime Software

Data sheet httpwwwa-a-inccomdocumentsAA_DS203A_EclipsepdfData Storage 16GB Solid State Drive

Data sheet httpwwwa-a-inccomdocumentsAA_DS204A_SSDpdfEnclosure Standard wall-mounted NEMA 4X stainless steel type 304 Enclosure

Options in data sheet httpwwwa-a-inccomdocumentsAA_DS401X_EnclosurespdfCertifications Class I Division 2 mdash optional

Class I Division 1 mdash optionalATEX Exp II 2(2) GD mdash optionalAny other certification mdash please inquire

Measuring ParametersAccuracy amp Repeatability Analyte Typical Range Accuracy Repeatability

H2S 0-2 plusmn1 of full scale plusmn04SO2 0-2 plusmn1 of full scale plusmn04

Air Demand -2 to +2 plusmn1 of full scale plusmn04COS 0-2000 ppm plusmn1 of full scale (plusmn5 lt 500 ppm) plusmn04CS2 0-2000 ppm plusmn1 of full scale (plusmn5 lt 500 ppm) plusmn04

Zero Drift plusmn01 after 1hr warm-up measured over 24hrs at constant ambient temperatureSensitivity plusmn01 full scaleNoise plusmn0004 AU at 220 nmOff-Ratio Range 1001 gt H2SSO2 ratio gt 120Response Time (T10 - T90) 10 seconds

All performance specifications are subject to the assumption that the sample conditioning system and unit installation are approved by Applied Analytics For any other arrangement please inquire directly with Sales

Sub

ject

to m

odifi

catio

ns S

peci

fied

prod

uct c

hara

cter

istic

s an

d te

chni

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ata

do n

ot s

erve

as

guar

ante

e de

clar

atio

ns

[7]




Ambient ConditionsAnalyzer Environment IndoorOutdoor (no shelter required)Ambient Temperature Standard 0 to 40 degC (32 to 104 degF)

With optional temperature control -20 to 55 degC (-4 to 131 degF)To avoid radiational heating use of a sunshade is recommended for systems installed in direct sunlight

Physical SpecificationsDimensions Analyzer 24rdquordquo H x 20rdquordquo W x 8rdquordquo D (610mm H x 508mm W x 203mm D)

Prove Average Dimensions 36rdquo length x 12ldquo widest diameter (914mm x 305mm)Optional Utility Control Panel 24rdquo H x 24rdquo W x 8rdquo D (610mm H x 610mm W x 203mm D)

Weight Analyzer 32 lbs (15 kg)Prove Average Weight 29 lbs (13 kg)Optional Utility Control Panel 25 lbs (11 kg)

Wetted Materials Standard Stainless Steel 316316L KalrezVarious custom materials available mdash please inquire

Probe Material Standard Stainless Steel 316316LOther materials available

UtilitiesUtility Management Optional Utility Control Panel

Data sheet httpwwwa-a-inccomdocumentsAA_DS004C_TLG837_UCPpdfElectrical Requirements 85 to 264 VAC 47 to 63 HzPower Consumption 65 wattsInstrument Air 70 psig (-40 degC dew point)Steam Pressure 70 psig for DEMISTER chamber

30-50 psig for probe blowback function75-100 psig for optional ball valve steam jacket

OutputsCommunicationOutputs 1x galvanically isolated 4-20mA analog output per measured analyte

5x digital relay outputs for indication and control1x K type ungrounded thermocouple inputOptional Modbus TCPIP RS-232 RS-485 Fieldbus Profibus HART more

IO Electronics VoltageCurrent Interface Module (ie IO Board)Data sheet httpwwwa-a-inccomdocumentsAA_DS205A_VCIMpdf

is a registered trademark of Applied Analytics Group BV | wwwa-a-inccom

Europe SalesApplied Analytics Europe SpAMilan Italy | salesappliedanalyticseu

Headquarters + ManufacturingApplied Analytics IncBurlington MA | salesa-a-inccom

North America SalesApplied Analytics North America LtdHouston TX | salesappliedanalyticsus

India SalesApplied Analytics (India) Pte LtdMumbai India | salesappliedanalyticsin

Middle East SalesApplied Analytics Middle East (FZE)Sharjah UAE | salesappliedanalyticsae

Asia Pacific SalesApplied Analytics Asia Pte LtdSingapore | salesappliedanalyticscomsg

Brazil SalesApplied Analytics do BrasilRio de Janeiro Brazil | salesaadblcombr


TM



TLG-837 Tail Gas Air Demand AnalyzerRevised 27 March 2014

copy 2013 Applied Analytics Group BV Products or references stated may be trademarks or registered trademarks of their respective owners All rights reserved We reserve the right to make technical changes or modify this document without prior notice Regarding purchase orders agreed-upon details shall prevail

Subject LocationTLG-837 DEMISTER ProbeData sheet

httpwwwa-a-inccomdocumentsAA_DS004B_TLG837_Probepdf

TLG-837 Utility Control PanelData sheet

httpwwwa-a-inccomdocumentsAA_DS004C_TLG837_UCPpdf

Advantage of Collateral DataTechnical Note

httpwwwa-a-inccomdocumentsAA_TN-202_CollateralDatapdf

Multi-Component AnalysisTechnical Note

httpwwwa-a-inccomdocumentsAA_TN-203_MultiComponentAnalysispdf

Further Reading

DEMISTER Sampling ProbeApplied Analytics Data Sheet No DS-004B mdash Revised 18 June 2013

1APPLIEDA N A L Y T I C S

TM

DS-004B DEMISTER Sampling Probe

Automatic sulfur vapor removal inside the probe

The patented DEMISTER Probe for the TLG-837 Tail Gas Analyzer is mounted directly on the process pipe The absorbance measurement occurs inside the probe head minimizing the sample transport time Entrained sulfur vapor is removed from the sample as an internalized function This probe was designed to be lightweight and compact making it easy to install and service by a single technician

Features

raquo Patented sulfur vapor removal mechanism with no external demister



raquo Light compact form factor simplifies installation and reduces physical footprint

2

Applied Analytics Data Sheet No DS-004B mdash Revised 18 June 2013

DEMISTER Sampling Probe


Probe Concept

Tail gas contains elemental sulfur which is quick to condense and plug mechanical cavities or obstruct optical signals Online analysis of tail gas requires a sulfur removal mechanism in order to operate at all

The DEMISTER probe actively removes sulfur from the rising sample as an internalized function within the probe body Recycling the steam generated by the Claus process the probe controls the temperature along its body at a level where all elemental sulfur vapor in the rising sample condenses and drips back down to the process pipe The sample that reaches the optical measurement cell in the probe head is virtually sulfur-free posing no threat of plugging freezing or interference

Demister Probe Legend

(A) High-Pressure Steam In(B) Steam Out(C) Light Signal In(D) Light Signal Out(E) Steam Out(F) Low-Pressure Steam In(G) Aspirator Air In(H) Sample Return Point(J) Sample Entry Point

( ) Liquid Sulfur Droplet( ) Sample Route

A B

E FG

H

C D

J

Automatic Sulfur Vapor Removal

Inside the probe an internal lsquodemisterrsquo chamber (concentric to the probe body) is fed with low pressure steam (see E amp F) Since the LP steam is much cooler than the tail gas this chamber has a cooling effect on the rising sample

Elemental sulfur has the lowest condensation point of all of the components in the tail gas Due to the internal probe temperature maintained by the LP steam all of the elemental sulfur in the rising sample is selectively removed by condensation while a high-integrity sample continues upward for analysis in the probe head

In Situ Measurement

The point of interaction between the light signal and the sample gas occurs directly in the flow cell disk inside the probe head (C amp D) The flow cell disk has a built-in high pressure steam channel (A amp B) to heat the cell and ensure that any present sulfur remains gaseousmdasheliminating the possibility of condensation on the optical windows

The Sample Return

An aspirator (G) creates a Venturi effect which pulls the sample up the probe body intake path through the flow cell for analysis and down the return line The used sample is released back into the process pipe (H)

3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead

Probe RetractorAllows easy removal by hand or power drill

Probe HeadHouses flow cell disk where optical measurement occurs

Cooling ExtensionProtects fiber optics from the heat of the sample gas

ThermocoupleProvides probe temperature measurement to analyzer

Safety CableSafety measure to prevent probe ejection

Fiber Optic CablesTransmit light signal bw probe and analyzer unit

Full Port 2rdquo Ball ValveProvides process seal so that probe can be inserted or removed without requiring process shutdown

4




Flow Cell Disk

The flow cell disk is built into the probe head A special steam-traced channel above the flow cell disk is continuously fed with HP steam in order to heat the flow cell and prevent any residual elemental sulfur from condensing and fouling the optical windows It also has an automated self-wash steam cycle if used in conjunction with the Utility Control Panel

NOTE this demo flow cell disk has a glass cutaway to display the steam tracing channel above the measurement cell

Cooling Extensions

The cooling extensions screw into opposite ends of the optical path inside the flow cell disk These steel extensions protect the fiber optic cables from the heat of the sample

cooling extensions











TM

5 DS-004B DEMISTER Sampling Probe



Technical DataEnvironment IndoorOutdoor (no shelter required)Dimensions Prove Average Dimensions 36rdquo length x 12ldquo widest diameter (914mm x 305mm)

Optional Utility Control Panel 24rdquo H x 24rdquo W x 8rdquo D (610mm H x 610mm W x 203mm D)Weight Prove Average Weight 29 lbs (13 kg)

Optional Utility Control Panel 25 lbs (11 kg)Wetted Materials Standard Stainless Steel 316316L Kalrez

Various custom materials available mdash please inquireProbe Material Standard Stainless Steel 316316L

Other materials available Utility Management Optional Utility Control Panel

Data sheet httpwwwa-a-inccomdocumentsAA_DS004C_TLG837_UCPpdfInstrument Air 70 psig (-40 degC dew point)Steam Pressure 70 psig for DEMISTER chamber


Subject to modifications Specified product characteristics and technical data do not serve as guarantee declarations

TLG-837 Utility Control PanelApplied Analytics Data Sheet No DS-004C mdash Revised 18 June 2013


TM

DS-004C TLG-837 Utility Control Panel

Turnkey integration for the TLG-837 Tail Gas Analyzer

The Utility Control Panel (UCP) regulates utilities going to the DEMISTER sampling probe for the TLG-837

Features

raquo Regulates LP steam pressure for demister chamber in probe body

raquo Regulates HP steam pressure for flow cell steam tracing in probe head

raquo Provides zero gas for Auto Zero sequence

raquo Provides span gas in case Auto Span is desired

raquo Controls aspirator flow rate

raquo Provides steam failure blowback feature in the event of faulty steam utilities the flow cell disk is sealed from the sample and the cell is purged with nitrogen from the UCP











TM

2 DS-004C TLG-837 Utility Control Panel

Applied Analytics Data Sheet No DS-004C mdash Revised 18 June 2013

TLG-837 Utility Control Panel

Technical DataEnclosure Standard wall-mounted NEMA 4X stainless steel type 304 EnclosureEnvironment IndoorOutdoor (no shelter required)Dimensions 24rdquo H x 24rdquo W x 8rdquo D (610mm H x 610mm W x 203mm D)Weight 25 lbs (11 kg)

[2]




The Claus Process Analysis Need

The sulfur recovery unit (SRU) of a refinery is dedicated to processing the H2S stripped from the hydrocarbon fuel through a series of operations that convert it into water and harmless elemental sulfur which can be sold and repurposed

The Claus process is the industry standard for treating the H2S-rich ldquosourrdquo gas In the reaction furnace H2S is combusted

3H2S + 32O2 SO2 + H2O + 2H2S

A catalytic converter reacts the products of the combustion to create elemental sulfur in it various crystalline forms

2H2S + SO2 2H2O + 3XSX

As can be deduced from the 2nd reaction above the typical Claus reaction runs most efficiently when the stoichiometric ratio of H2S to SO2 is controlled at 21 The reactions above demonstrates that this ratio is controlled by adjusting available oxygen

The efficiency of sulfur recovery therefore hinges on the ldquoAir Demandrdquo signal which informs the oxygen adjustment in the DCS The Air Demand is calculated by multiplying the expression (2[SO2] - H2S) by a scaling factor Obtaining the real-time Air Demand value requires continuous reliable measurement of the H2S and SO2 concentrations in the Claus tail gas Additionally COS and CS2 levels in the tail gas can be indicators of reduced efficiency or potential catalyst issues

In the diagram below the tail gas analysis point is identified by AT6

[3]





xenon light source

holographicgrating

diode array

fiber optic cables

flow cell disk

o-ring

collimator

cooling extension

steam tracing










IO board

powersupplies

circuitbreakers

[4]











[6]



















Sub

ject

to m

odifi

catio

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ata

do n

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erve

as

guar

ante

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clar

atio

ns

[7]


























TM













Further Reading



TM




Features





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM





[3]





xenon light source

holographicgrating

diode array

fiber optic cables

flow cell disk

o-ring

collimator

cooling extension

steam tracing










IO board

powersupplies

circuitbreakers

[4]











[6]



















Sub

ject

to m

odifi

catio

ns S

peci

fied

prod

uct c

hara

cter

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d te

chni

cal d

ata

do n

ot s

erve

as

guar

ante

e de

clar

atio

ns

[7]


























TM













Further Reading



TM




Features





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM







IO board

powersupplies

circuitbreakers

[4]











[6]



















Sub

ject

to m

odifi

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fied

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hara

cter

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s an

d te

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ata

do n

ot s

erve

as

guar

ante

e de

clar

atio

ns

[7]


























TM













Further Reading



TM




Features





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM








[6]



















Sub

ject

to m

odifi

catio

ns S

peci

fied

prod

uct c

hara

cter

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s an

d te

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cal d

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do n

ot s

erve

as

guar

ante

e de

clar

atio

ns

[7]


























TM













Further Reading



TM




Features





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM





[7]


























TM













Further Reading



TM




Features





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM














TM













Further Reading



TM




Features





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM







TM




Features





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM





2




Probe Concept






A B

E FG

H

C D

J




In Situ Measurement


The Sample Return


3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM





3




probe retractor

probe head

cooling extension

ball valve

fiber optic cables

safety cable

flange

angled inlet tip

thermocouple lead








4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM





4




Flow Cell Disk



Cooling Extensions


cooling extensions











TM














TM




Features

















TM















TM














TM




Features

















TM







TM




Features

















TM















TM





tlg-837 tail gas / air demand analyzer

Documents