Excess Air Control For Cracker Furnace Burners
First Claim
1. A method for control of the air/fuel ratio of the burner(s) of a thermal cracker for producing olefins which comprises a birebox portion, an bridge wall portion and a convection portion, comprising the steps of:
- (a) directing a wavelength modulated beam of near infrared light from a tunable diode laser through combustion gas from the burner to a near infrared light detector to generate a detector signal wherein the beam is shown directed through the bridge wall portion;
(b) analyzing the detector signal for spectroscopic absorption at wavelengths characteristic for an analyte selected from the group consisting of oxygen, carbon monoxide and nitrogen oxide to determine the concentration of the analyte in the combustion gas; and
(c) adjusting the air/fuel ratio of the burners (excess air) in response to the concentration of the analyte of step (b).
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Abstract
A method for control of the air/fuel ratio of the burner(s) (excess air) of a thermal cracker which includes three steps. The first step is to direct a wavelength modulated beam of near infrared light from a tunable diode laser through combustion gas from the burner to a near infrared light detector to generate a detector signal. The second step is to analyze the detector signal for spectroscopic absorption at wavelengths characteristic for an analyte selected from the group consisting of oxygen, carbon monoxide and nitrogen oxide to determine the concentration of the analyte in the combustion gas. The third step is to adjust the air/fuel ratio of the burner(s) (excess air) in response to the concentration of the analyte of the second step.
19 Citations
4 Claims
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1. A method for control of the air/fuel ratio of the burner(s) of a thermal cracker for producing olefins which comprises a birebox portion, an bridge wall portion and a convection portion, comprising the steps of:
- (a) directing a wavelength modulated beam of near infrared light from a tunable diode laser through combustion gas from the burner to a near infrared light detector to generate a detector signal wherein the beam is shown directed through the bridge wall portion;
(b) analyzing the detector signal for spectroscopic absorption at wavelengths characteristic for an analyte selected from the group consisting of oxygen, carbon monoxide and nitrogen oxide to determine the concentration of the analyte in the combustion gas; and
(c) adjusting the air/fuel ratio of the burners (excess air) in response to the concentration of the analyte of step (b). - View Dependent Claims (2, 3, 4)
- (a) directing a wavelength modulated beam of near infrared light from a tunable diode laser through combustion gas from the burner to a near infrared light detector to generate a detector signal wherein the beam is shown directed through the bridge wall portion;
Specification