A closed-loop control method for annealing furnace temperature and flue gas emission

Abstract

The invention relates to an annealing furnace temperature and flue gas emission closed-loop control method. The annealing furnace temperature and flue gas emission closed-loop control method comprisesthe following steps that a blending ratio of a gas flow rate to an air flow rate is controlled to ensure full combustion of gas; concentration values of particulate matter, SO2 and NOx in annealing furnace flue gas are monitored, and the data is transmitted to an annealing furnace main control room HMI (Human Machine Interface) through a regional computer network; and an operator adjusts the air-fuel ratio according to the temperature feedback information, meanwhile, the NOx concentration value in the flue gas is taken into account, the air flow rate is subjected to fine adjustment, and the closed-loop control over the temperature and smoke emission is completed. The flue gas emission concentration data and emission load data are transmitted to an operation room to be concentrated on thesame operation interface with original temperature parameters, the interlocking of the temperature and flue gas emission indexes is realized, the process parameters such as the air-fuel ratio are adjusted constantly according to the temperature and the flue gas indexes during operation so as to achieve the precise closed-loop control over the temperature and the flue gas indexes, and the real-timecontrol over the furnace temperature and the real-time control over the flue gas emission indexes are achieved.

Description

technical field [0001] The invention relates to the technical field of annealing furnaces in the iron and steel industry, in particular to a closed-loop control method for the temperature of the annealing furnace and the discharge of flue gas. Background technique [0002] Domestic annealing furnaces generally use natural gas or coke oven gas as fuel, which is combusted in a radiant tube after a reasonable ratio with air, and used as a heat source to heat the strip steel, and at the same time the gas is burned to emit flue gas. The usual practice is to control the temperature separately, and the flue gas is discharged according to the online Continuous monitoring or manual sampling test results adjustment, there are phenomena of exhaust gas exceeding the standard and response lagging. Contents of the invention [0003] The object of the present invention is to provide a temperature and smoke emission closed-loop control method of an annealing furnace which realizes closed-...

AI Technical Summary

Problems solved by technology

[0002] Domestic annealing furnaces generally use natural gas or coke oven gas as fuel, which is combusted in a radiant tube after a reasonable ratio with air, and used as a heat source to heat the strip steel, and at the same time the gas is burned to emit flue gas. The usual practice is to control the temperature separately, and the flue gas is discharged according to the online Continuous monitoring or adjustment of manual sampling test results, there are phenomena of exhaust gas exceeding the standard and response lagging