A Measuring Method Based On Photodiodes For
The Diagnostic Of Optimal Combustion Conditions
Author(s)
L. Arias, O. Farías, S. Torres & D. Sbárbaro
Abstract
A non-intrusive method for monitoring flames in gas burners is presented. The
method is based on the optical analysis of the flame by using a Silicon
Photodiodes array and a set of interference optical filters. The covered
wavelengths evaluate the formation and behaviour of excited CH* and C2*
radicals for confined gas flames. The monitoring of these radicals is carried out
in the flame reaction region at the burner exit, where the C2*/CH* ratio signals
provide enough information to identify the optimal fuel–air ratio in order to
obtain the boiler maximal efficiency and to prevent an incomplete combustion.
The experimental results obtained for two power levels, in a boiler of 150 kW,
demonstrate that the C2*/CH* ratio provides important information concerning
the combustion state and gives a clear indication about the burner adjustment
when CO emissions begin to increase to the upper the levels accepted by
environmental laws. The fast response and its non-intrusive character give to the
proposed optical sensor an important potential to be used in advanced control
strategies for the on-line optimization of the combustion process.
Keywords: combustion, gas, flame spectrum, photodiodes, optimization, optical
sensor.
1 Introduction
The monitoring of the combustion state in boilers and industrial furnaces is
limited due to the hostile environment. Indeed, the high temperature, the
corrosive atmosphere and the limited access to the flame characteristics restrict a
reliable diagnostic. The information provided by conventional combustion
Keywords
combustion, gas, flame spectrum, photodiodes, optimization, optical
sensor.
Related Book
Other papers in this volume
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