|
|
|
|
 Sour Gas Processing and Conditioning
Model 933-C Reliable H2S Analyzer for the Contactor Overhead
A critical measurement of natural gas quality is the concentration of hydrogen sulfide (H2S). Remarkably, the common technique for making this measurement, lead acetate tape, is at least 70 years old. Use of this archaic technology requires that the sample gas be relatively free of moisture or dry. These analyzers must be installed, not on the outlet of the sweetening process they are meant to control, but far downstream—after the dryers.
This installation location builds tremendous lag time into the feedback control loop of the sweetening process. Significant time is consumed waiting for the results of an operational change to travel from the sweetening unit’s outlet, the contactor overhead, through the entire drying system and finally into the H2S analyzer. In natural gas processing, upset time equals lost revenue because out-of-spec gas must typically be destroyed. These losses are maximized by the lag time built into the current control strategy required by the lead acetate tape analyzer’s dependence on dry sample gas. AMETEK Western Research has responded to the need for a low maintenance, reliable, and rugged H2S analyzer that can sample upstream of the dryers—directly from the sweetening unit’s contactor overhead line. The Model 933-C uses our proprietary frontal elution chromatography sampling technique along with a heated sample handling system to continuously analyze the very wet natural gas exiting the sweetening unit through the contactor overhead. The sample handling technology of the 933-C combines with our exceptionally high resolution multiwavelength UV optical bench to provide you an extremely reliable analyzer. The 933-C is designed to operate unattended for six months or more.
By measuring the H2S exiting the sweetening unit, you will be able to instantly respond to a process upset resulting in tremendous cost savings. This savings is repeated each and every time an upset occurs. Model 933-C in standard fiberglass enclosure methyl mercaptan, which is also measured, and finally, the interfering ethyl mercaptan. Interference by ethyl mercaptan is prevented by terminating the sample analysis before it elutes, and then switching to a fresh column so that the analysis may continue. Two columns are employed in the 933-C. While one column is conditioning the gas sample, the other is automatically regenerated.
Product PDFs:
|
|
|
|
©2000 - 2003 SOUTHERN ANALYTICAL,
INC. 2004
|
|
)
