US2011062056A1PendingUtilityA1

Excess Air Control For Cracker Furnace Burners

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Assignee: TATE JAMES DPriority: May 16, 2005Filed: Nov 2, 2007Published: Mar 17, 2011
Est. expiryMay 16, 2025(expired)· nominal 20-yr term from priority
Inventors:James D. TateGerald D. FrederickSylvester IrvingCharles W. LippAndy WeberChris Reed
F27D 19/00F27D 99/0033C10G 9/206G01N 21/39F27D 21/00
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Claims

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.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         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). 
     
     
         2 . The method of  claim 1 , wherein the wavelength of the near infrared light from the tunable diode laser is in the range of from about 500 to about 15000 wavenumbers. 
     
     
         3 . The method of  claim 1  wherein the concentrations of both oxygen and carbon monoxide are determined. 
     
     
         4 . The method of  claim 1  wherein the wavelength used to determine concentration of carbon monoxide is about 2333 nanometers.

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