In-Situ Gas Analyzer

The company has developed an in-situ gas analyzer based on telecom laser technology for measuring right at the heart of industrial processes; e.g. into a unique method for achieving greater precision in deNOx systems. With response times as low as one second together with high accuracy sub ppm level, the equipment makes it possible to control deNOx systems in real time. The application means that undesirable NOx emission can be dramatically reduced, with a minimum of ammonia slip as well as optimize the consumption itself of ammonia or urea.

The LDS 3000 product makes it possible to analyze sub ppm level NH₃ in a process with response time below one second. The measuring signal can then directly be used to adjust the addition of ammonia in SCR or SNCR, allowing efficient control with extremely high precision. The result is low emissions and residual products of significantly better quality.

The analyzer is largely based on optical components from the telecom industry, and consists of three main parts: a central unit, fiber optics and sensors. The central unit contains a diode laser and accompanying control electronics. The fiber optics transport laser light between the central unit and the sensors. The sensors in turn consist of a transmitter and a receiver mounted to achieve cross duct in-situ measurements. The use of fiber optics means that the central unit can be placed in a safe, clean environment, which in combination with the in-situ placement of the sensors helps minimize the need for maintenance.

The unit can cope with long measuring distances and high ash content without compromising on performance and precision. As an example, the resolution for ammonia is ± 0.2 ppm on a 3-10 meter measuring path.

AltOptronic AB, Ringogatan 12, Box 8910, SE-402 73 Goteborg, Sweden. Tel: +46 (0)31-50 68 50. Fax: +46 (0)31-22 21 19.