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Apparatus for estimating an unburned component amount in ash in a coal-fired furnace

  • US 5,231,939 A
  • Filed: 01/30/1992
  • Issued: 08/03/1993
  • Est. Priority Date: 04/05/1991
  • Status: Expired due to Fees
First Claim
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1. In a powered coal combustion furnace in which coal is pulverized by a pulverizing mill, only the powdered coal whose grain size is smaller than a specified one is extracted by a fine/coarse grain separator and the extracted powdered coal is fired in the combustion furnace, an in-ash unburned component estimating apparatus for a coal-fired furnace characterized in performing the steps of:

  • taking in as fuzz quantities an in-furnace temperature, a load band in the furnace, a furnace contamination coefficient, a ratio of two-stage combustion air supplied to the furnace, and a coal mixture ratio;

    inferring coal-fuel ratio data and correction data used to correct predetermined reference values of reference in-furnace temperature distribution, reference in-furnace air ratio distribution and reference powdered coal grain size distribution; and

    based on the reference values corrected by the correction data and on coal reaction rate data determined from the coal-fuel ratio data, calculating the density of in-ash unburned components in burning exhaust gases.

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