Hot galvanizing annealing furnace air-fuel ratio correction method

Abstract

The invention discloses a hot galvanizing annealing furnace air-fuel ratio correction method and belongs to the technical field of combustion control. The control method includes the steps that the air-fuel ratio with excessive combustion-supporting air is determined according to the theoretical air / fuel gas ratio, the theoretical dry flue gas / fuel gas ratio and the set value of the oxygen content in the dry flue gas; an air-fuel ratio correction coefficient of a nozzle which is not ignited is obtained; and the corrected air-fuel ratio is determined according to the air-fuel ratio with the excessive combustion-supporting air and the air-fuel ratio correction coefficient of the nozzle which is not ignited. The above method is adopted to correct the air-fuel ratio to guarantee that the oxygen content in flue gas maintains a reasonable range, so that full combustion of the fuel gas and the air is guaranteed, the effect that combustion can be in the optimal station in both the temperature raising process and the cooling process is achieved, heat efficiency is improved, and the quality of a galvanized product is guaranteed.

Description

technical field [0001] The invention relates to the technical field of combustion control, in particular to a method for correcting the air-fuel ratio of a hot-dip galvanizing annealing furnace. Background technique [0002] The combustion control system is one of the prerequisites and keys of the annealing furnace temperature control system. The basic task of the combustion control system is to adapt the heat provided by the combustion to the load of the production line, while ensuring economical combustion and safe operation. [0003] The temperature control system of the annealing furnace adopts a double-crossing limiting combustion control method. When the furnace temperature changes, the actual value of the air flow is used to limit the set value of the gas flow. The fixed value is used as the upper and lower limit, and the change of air flow and the change of gas flow restrict each other to ensure sufficient and stable combustion. [0004] Since the production process...

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the technical problem existing in the prior art that there is excessive gas or air when the furnace temperature changes rapidly and cannot ensure sufficient combustion of gas and air by providing a method for correcting the air-fuel ratio of a hot-dip galvanizing annealing furnace

Images