&lt;title&gt;In-situ measurement of the water vapor concentration in industrial ovens by a user-friendly semiconductor laser system&lt;/title&gt;

Kohns, P.; Stoermann, R.; Budzynski, Ewa; Walter, Nicolai; Knoop, Jennifer; Kuester, R.

doi:10.1117/12.281202

Cited by 1 publication

(1 citation statement)

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“…The high sensitivity and fast response of TDLAS [68][69][70][71][72][73][74][75][76] enable the monitoring of plant controlling parameters such as O 2 and CO. TDLAS applications extend to O 2 [77], CO [78], H 2 O [69,73,77], CO 2 [73,78], C 2 H 2 [79], NH 3 [80], OH [78], HCl [81], NO [82], NO 2 [83], etc, and applications in high-pressure and high-temperature fields have been discussed [84][85][86]. Although extensive research has been performed to utilize diode laser absorption spectroscopy for combustion control [74][75][76][77][78], applications consist primarily of smallscale test combustors, and usage for large-scale commercial combustors has been rather limited [86]. Accordingly, this report also describes the real-time measurement of the O 2 and CO concentrations in a 300 ton day −1 commercial incinerator furnace to improve combustion control using the in-furnace O 2 and CO concentrations measured at multiple points in the combustion area.…”

Section: Introductionmentioning

confidence: 99%

Industrial applications of temperature and species concentration monitoring using laser diagnostics

Deguchi¹,

Noda²,

Fukuda³

et al. 2002

Meas. Sci. Technol.

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Industrial applications of laser diagnostics have been demonstrated for the purpose of clarifying combustor chemical reaction mechanisms, as well as temperature and harmful substance monitoring in large-scale burners and commercial plant exhaust ducts, and the combustion control of commercial plants. Laser induced fluorescence (LIF), laser induced breakdown spectroscopy (LIBS), and tunable diode laser absorption spectroscopy (TDLAS) have accordingly been applied in various industrial fields. In this study, temperature and species concentration were measured inside gas turbine combustors, a diesel engine, and a large-scale industrial burner using LIF. This technique introduces a new tool with respect to practical combustors for the analysis of NO formation characteristics, turbulent flame front structure, and differences between standard and improved combustors. On-line monitoring of trace elements to the ppb level was also successfully demonstrated using LIBS. The automated LIBS unit was found to be capable of monitoring trace element concentration fluctuations at ppb levels with a 1 min detection time under actual plant conditions. In addition, real-time measurement of O2 and CO concentrations in a commercial incinerator furnace was performed using TDLAS to improve the combustion control. By using the multiple-point laser measurement results to control secondary air allocation, higher secondary combustion efficiency was achieved, and CO concentration (considered to be a substitute indicator for dioxins) was reduced from 11.9 to 8.0 ppm.

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