October 14, 2007 - AAI's Feed Forwards Analyzer monitors the H2S concentration in feed gas or acid gas (H2S 0-100%) via a direct UV spectroscopic technique. The signals obtained in this method are used to control oxygen input to the SRU (Sulfur Recovery Unit) in question, as well as continuously analyzing and evaluating process effectiveness. AAI analyzers respond extremely rapidly to high fluctuations of H2S concentration while easily correcting for pressure and flow variations in the stream.The efficiency of sulfur recovery, a procedure of utmost importance in many industrial processes, has gradually improved over the years. In maximizing this efficiency, control over oxygen input is paramount.
Proper control in this respect requires accurate monitoring of H2S levels in acid gas; this in turn necessitates consideration of certain parameters such as time delay between measured signals from the beginning and the end of the process, or the extreme variation of feed gas concentrations throughout the process. It has been demonstrated that feeds forward control in conjunction with tail gas control in sulfur recovery units drastically increases efficiency of recovery.
Some of the advantages of integrating an AAI analyzer include:
Safety of operation and analyzer components:
H2S, particularly at high concentration, is extremely toxic and corrosive. AAI's FFA product line utilizes fiber optics to transmit light to and from the flow cell, allowing the electronics to be housed in a separate enclosure that is protected from the gas flow. AAI prioritizes the safety of our analyzers as well as the safety of those operating them.
No moving parts:
AAI's solid state technology is a clear benefit in the corrosive environments it is designed for.
Fast response and auto-compensation:
The full-spectrum diode array FFA analyzer responds rapidly to wide fluctuations in concentration. The instrument also automatically compensates for pressure variation by continuously checking measurement point pressure against calibration pressure.
Flexibility:
If necessary, the system can incorporate infrared detection for monitoring concentrations of CH4 and CO2 all integrated and using the same controller and sampling system.
