EP0507060A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

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

Assignee: Kawasaki Heavy Industries Ltd

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Filing: 1992-02-12

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Granted: —

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Expires: 2012-02-12

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Abstract

Abstract This invention relates to an in-ash unburned component estimating device for a coal-fired furnace which monitors the density of in-ash unburned component contained in burning waste gases to operate the furnace efficiently. The object of the invention is to infer and estimate from the current situation by a simple means the density of in-ash unburned component in the burning exhaust gases that affects the combustion efficiency. A 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 are taken in as fuzzy quantities to infer 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 diameter distribution. The reference values corrected by the correction data and coal reaction rate data determined from the fuel ratio data are used to calculate the density of in-ash unburned components in the burning waste gases.

Inventors

👤 Shinji Tanaka
👤 Tatsuya Miyatake
👤 Kazuyoshi Yamamoto
👤 Yuichi Miyamoto
👤 Eiichi Harada

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-04 09:45

CPC Classifications

F; F23; F23N; F23N5/00; F23N5/003; F23N1/00; F23N1/02; F23N1/022; F23K; F23K2201/00; F23K2201/10; F23N2223/00; F23N2223/52; F23N2241/00; F23N2241/18; Y; Y10; Y10S; Y10S706/00; Y10S706/90

Claims Analysis

Total Claims: 2

Claim 1

Independent Claim 159 words

In a powdered 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 fuzzy 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 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 fuel ratio data, calculating the density of in-ash unburned components in burning waste gases.

Claim 2

Dependent Claim 225 words

In a powdered 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 comprising: a fuzzy inference unit which takes in as fuzzy 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 and infers 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; a reference unit which stores the predetermined reference values of the reference in-furnace temperature distribution, the reference in-furnace air ratio distribution and the reference powdered coal grain size distribution and also stores coal reaction rate data corresponding to the fuel ratio data; a correction unit which corrects the reference values output from the reference unit according to the correction data output from the fuzzy inference unit; and a calculation unit which calculates the density of in-ash unburned components based on the reference values corrected by the correction unit and on the reaction rate data output from the reference unit.

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