Combustion control apparatus for a coal-fired furnace

Details Combustion control apparatus for a coal-fired furnace Combustion control apparatus for a coal-fired furnace

1992-01-02

1992-10-27

Favors, Edward G.

Furnaces

With control means responsive to a sensed condition

Feed control

110185, 110232, 110347, F23N 518

Patent

active

051580241

ABSTRACT:
This invention relates to a combustion control apparatus for a powdered coal-fired furnace that monitors noxious substances contained within the burning waste gases, unburned substances within the ash and the power data of a pulverizing mill in order to operate the combustion furnace safely and efficiently. The combustion control apparatus infers from the current states or data optimal control amounts that will maintain within the minimum allowable ranges the noxious nitrogen oxides and the in-ash unburned substances that affect the combustion efficiency-and thereby controls the combustion furnace with good stability. The combustion control apparatus qualitatively evaluates as fuzzy quantities the density data of the nitrogen oxides contained within the exhaust gases of the unburned substances contained within the ash, and the power data of the pulverizing mill. Based upon the evaluation results a fuzzy inference is formed so as to determine the optimum control amount of the two-stage combustion air ratio for minimizing the nitrogen oxides and also the optimum control amount for the fine/coarse gain separator so as to extract powdered coal of a grain size most effective for minimizing the unburned substances within the ash.

REFERENCES:
patent: 4528918 (1985-07-01), Sato et al.
patent: 4640204 (1987-02-01), Williams

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