Claus Gas Analyser The Claus Technology is the

Claus Gas Analyser The Claus Technology. . . is the world's most significant gas desulfurizing process, recovering elemental sulfur from gaseous hydrogen sulfide. Raw Materials and Products t Gases with a H 2 S content of over 25 % are suitable for the recovery of sulfur in Claus plants. t These gases may also contain hydrogen cyanide, hydrocarbons, sulfur dioxide or ammonia. t They mainly originate from physical and chemical gas treatment units (Rectisol, Purisol and amine scrubbers) in refineries, gasification or synthesis gas plants. t The sulfur recovered in Claus plants is used for manufacturing medicine, cosmetics, fertilizers PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 1 and rubber products. Harald Mahler 11 -2000

Claus Gas Analyser Applications in Manifold Processes Sour gas from natural gas fields Sour refinery gas Sour water stripper gas Sour gas from chemical plant Sour gas from salt production plant PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 2 Sour gas from coal gasification Harald Mahler 11 -2000

PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 3 Claus Gas Analyser Process Flow Diagram of Claus-Process Harald Mahler 11 -2000

Claus Gas Analyser Process Flow Diagram of Claus-Process Isothermal Step H 2 S: > 25 %. 2 H 2 S+3/2 O 2 > 850 °C Cooled to liquid S 2 H 2 S+S 02 T control Accurate dosage important ! SO 2 + H 2 O 3/2 S 2+2 H 2 O Ratio 2 : 1 IMPORTANT Other reactions CO 2+H 2 S COS+H 2 O CO+1/2 S 2 COS+H 2 S CS 2+H 2 O PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 4 60 -70 % output of S Harald Mahler 11 -2000

Claus Gas Analyser Process Flow Diagram of Claus-Process Catalytic Step = Activated Alumina 1. Heating 205 to 2. Catalytic reaction 230°C 3. Condensation 1. +2. H 2 S+SO 2 3. 130 to 170°C H 2 S+S 02 3/6 S 6+2 H 2 O 3/8 S 8+2 H 2 O Further step either burning PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 5 or desulphurization downstream Harald Mahler 11 -2000

Claus Gas Analyser Process Points of Interest Feed acid gas H 2 S Entrance of Catalytic Convertor H 2 S - SO 2 Emission gas after incinerator : SO 2 - CO - H 2 S - NO Analysis for enhanced Claus processes O 2 Tail Gas Analysis H 2 S - SO 2 - H 2 O - N 2 - COS CO 2 At sulfur pit H 2 S Air (partial) To Incinerator Folie 6 C PGC 302 Claus Application Excellence in Automation & Drives: Siemens Harald Mahler 11 -2000

Claus Gas Analyser Tail Gas Analysis for Process Optimisation For proper control of a Claus process , the hydrogen sulphide ( H 2 S ) and sulphur dioxide ( SO 2 ) must be measured in tail gas. Major problem Sample gas is saturated with sulfur vapour Plugging of sample lines and analyzer Further problem Due to the presence of CO 2 and HC, COS and CS 2 will be formed. Concentrations difficult to predict Depending on changing of CO 2 and HC concentration PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 7 Changing of burner temperature. CO 2 and CS 2 interfere UV analysis of SO 2 and H 2 S. Harald Mahler 11 -2000

Claus Gas Analyser Our Solution. . . Process Chromatography PGC 302 Edition II Claus based on. . . r Standard Process Chromatograph with some specialties. . r Second hot oven for sample conditioning system PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 8 r Safety back-purge unit Installation on top of the process line Harald Mahler 11 -2000

Claus Gas Analyser Double Oven System Right Oven Sample conditioning system Sulphur trap and fastloop Air jet pump Back-purge system Calibration PGC 302 Claus Application Chromatograph Sample injection Pre-separation column Backflush Final separation TC-Detector Variable applications possible according customer´s requirements Excellence in Automation & Drives: Siemens Folie 9 Left Oven Harald Mahler 11 -2000

PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 10 Claus Gas Analyser PGC Tubing. . . Gas Flow during Process Run Harald Mahler 11 -2000

Claus Gas Analyser PGC Tubing. . . Gas Flow during Calibration PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 11 Closed Harald Mahler 11 -2000

PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 12 Claus Gas Analyser PGC Tubing. . . Gas Flow during Purge Harald Mahler 11 -2000

Claus Gas Analyser The Chromatogram H 2 S SO 2 PGC 302 Claus Application SO 2 on demand : H 2 O ( 3 Min Cycle ) Excellence in Automation & Drives: Siemens Folie 13 H 2 S Harald Mahler 11 -2000

N 2 COS H 2 O SO 2 H 2 S Claus Gas Analyser Extended Analysis. . . N 2 CO 2 H 2 S COS SO 2 H 2 O 0 -100% 0 -2% 0 -1% 0 -10% PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 14 CO 2 H 2 S - SO 2 ratio is calculated Harald Mahler 11 -2000

Claus Gas Analyser Steam Heated Sample Lines Tube - in - tube technology Sample : 6 mm OD Steam : 10 mm ID PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 15 Shut off valves : Steam jacketed Harald Mahler 11 -2000

Claus Gas Analyser Our Worldwide References PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 16 . . . more than 30 chromatographs in the field Harald Mahler 11 -2000

Claus Gas Analyser Our Competitors Manufactorer Principle Advantages Disadvantages AMETEK UV-Diodenarray-Spectrometer Fast Analysis (T 90=10 s) Interference by elem. S UV Optic covered by S film BOVAR NDUV Spectrometer Fast Analysis (T 90=5 s) Interference by elem. S UV Optic covered by S film GC others PGC 302 Claus Application less experiences with sample conditioning system Excellence in Automation & Drives: Siemens Folie 17 ABB and Harald Mahler 11 -2000

Claus Gas Analyser Where are our Customers. . . Endusers Licensors Clauspol - IFP North America Clinsulf-SDP - Linde Oxy. Claus - Lurgi Oil & Gas Oxy. Claus - The Pritchard Corp. Super. Claus - Stork Sure - BOC Gases Sure - Parsons Paques / Thiopaq - Shell PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 18 Engineerings Paques / Thiopaq - Du. Pont Harald Mahler 11 -2000

Claus Gas Analyser Our Benefits. . . Our Advantages n Proven technology with high reliability, long term stability, many references n Safe protection : Backpurge to clean analyzer and sample lines in case of any problem PGC 302 Claus Application Excellence in Automation & Drives: Siemens Folie 19 n n n n n with low temperature, power failure. . As well as during maintenance works. Easy operation , remote operation Easy maintenance , less frequently No UV-lamp, longer stability, no expensive spare parts regularely needed No interference by sulfur, COS CS 2 using chromatographic separation Comprehensive self diagnosis Extended analysis possible : N 2 COS H 2 O DCS-coupling using MODBUS Network with other PGCs on plant Good value for money Harald Mahler 11 -2000