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 THE NEED
In the past, conventional Claus sulfur recovery processes were adequately controlled on the basis of ratio or excess process air. However, the development of new and modified sulfur recovery processes has dramatically changed the analytical requirements placed on the tail gas analyzer. These applications require accurate chemical concentration data over wide dynamic ranges. Selective oxidation processes may require the analyzer to control the H2S/ SO2 ratio at values ranging from 1:7 to greater than 10:1. In addition, there is an increased need to provide reliable process data during upset conditions (to 5% H2S or SO2), to ensure correct response to such conditions. Data on COS and CS2 concentrations are also increasingly used to monitor catalyst and overall sulfur plant performance.
THE SOLUTION
The AMETEK Western Research Model 900 Air Demand Analyzer was specifically designed to meet the more demanding analytical requirements of these new processes. Used in conjunction with the ASR 900 sampling probe, which provides trouble-free sampling, the Model 900 ensures maximum data availability for optimum operation of all sulfur recovery processes.
The Model 900 uses AMETEK Western Research’s proprietary high resolution UV technology in a dual beam, multiple wavelength configuration. Resolution better than 0.02 nm is provided by high intensity, line source lamps. These sources emit at a fixed wavelength, providing great measurement stability, and emit low total power, removing the potential for sample photolysis. The high resolution enables unparalleled linearity over a wide dynamic range (less than 1% deviation over 4 to 5 orders of magnitude), which in turn leads to simple, robust data analysis. A six-position filter wheel enables one reference and five measure wavelengths. The dual beam configuration, combined with the reference measurement, ensures low noise performance, with minimal baseline and span drift.
When combined with the ASR 900 sample probe, the Model 900 is a complete analytical system, providing maximum performance and minimal maintenance. The ASR 900 probe incorporates a temperature controlled sulfur condenser, providing sulfur vapor control at the sample point and ensuring that no plugging will occur in the sample lines and analyzer. An integrated shut-off valve allows servicing without removal of the probe.
BENEFITS
- Measures up to five species simultaneously
- H2S, SO2, Sv, COS, CS2
- Specifically designed for off ratio applications
- Reliable, troublefree sampling
- Automated zero gas calibration
- Provides Modbus serial interface with plant DCS
APPLICATIONS
- Conventional Claus Processes
- Selective Oxidation Processes
- Coke Ovens
| Specifications |
| Methodology: Multiple wavelength, high resolution, nondispersive UV |
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Species Measured
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Minimum Full Scale
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Maximum Full Scale
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H2S
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5000 ppm
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10%
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SO2
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2500 ppm
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10%
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CS2
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5000 ppm
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10%
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COS
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5000 ppm
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10%
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Sv
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50 ppm
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500 ppm
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| Accuracy1: |
Better than 1% full scale |
| Repeatability1: |
Better than 0.5% full scale |
| Linearity1: |
Better than 1% full scale |
| Response Time: |
Typically less than 30s to T90 (excluding sample system) |
| Number of Gases: |
Up to 5 simultaneously (refer to AMETEK for possible combinations) |
| Sample Transport: |
Air aspiration |
| Typical Sample Flow: |
3 to 5 L/min (0.1 to 0.2 CFM) |
| Temperature Control: |
Independent control of four zones (oven, sample line, probe, vent line) |
| Ambient Temperature: |
5° to 50°C (41° to 122°F) |
| Instrument Air: |
Minimum 413.6KPa (60 psig), 120 L/min (4.24 CFM), instrument quality air |
| Power: |
120 VAC ±10%, 47-63 Hz or 240 ±10%, 47-63 Hz; 600 W for analyzer only excluding sample and vent line and ASR probe |
| Analog Outputs: |
4 to 20 mA self-powered (optional loop-powered), maximum of 4 |
| Communications: |
RS422 with Modbus protocol
RS485 optional
Ethernet optional
Relays 3 independent sets of SPDT relays alarm conditions |
| Physical Dimensions: |
1553.6 x 1117.6 x 306 mm (61.17 x 44 x 12 in.) |
| Weight: |
Estimated minimum 160 kg (350 lbs) |
| Approvals and Certifications: |
NEC/CEC Class I, Division 2, Groups C & D
ATEX II 2G EEx pd IIB T3
Russian Ex Proof Certification; 1ExpydIIBT3
Russian Gosstandart Pattern Approval
Complies with all relevant European Directives |
1. States specifications apply to SO2 and H2S only. Please consult factory for specifications on other species.
Product Data Sheets
Technical Papers
Other
Animated Video Presentations
- NEC/CEC Class I, Division 2, Groups C & D
- ATEX II 2G EEx pd IIB T3
- Russian Ex Proof Certification; 1ExpydIIBT3
- Russian Gosstandart Pattern Approval
- Complies with all relevant European Directives
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