A method and device for controlling nitrogen oxide emissions

Abstract

The embodiment of the invention provides a nitrogen oxide emission control method and device. The method comprises the following steps that the emission state of current nitrogen oxide is acquired; the position state of a current sintering end point is obtained; and the thickness of a material layer is adjusted according to the emission state of the current nitrogen oxide, the position state of the current sintering end point and a preset strategy. In the embodiment of the nitrogen oxide emission control method and device, according to the emission state of the current nitrogen oxide, the position state of the current sintering end point and the preset strategy, the thickness of the material layer is adjusted, under the premise that the sintering end point is ensured to be at a reasonableposition, the thickness of the material layer is properly reduced so as to improve air permeability of the material layer, the roasting speed (namely the vertical sintering speed) of the sintering process can be increased, so that the thickness of a combustion zone is reduced, and therefore the probability of nitrogen oxide generation is reduced, cost is low, the physical property of sintered oreis not influenced at the same time, and the quality of the sintered ore can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method and device for controlling nitrogen oxide emissions. Background technique [0002] With the rapid development of modern industry, the scale of steel production is getting larger and larger, and energy consumption is also increasing. Energy conservation and environmental protection have become important indicators in steel production. In iron and steel production, iron-containing raw material ores need to be sintered before entering the blast furnace for smelting. In the sintering process, various powdery iron-containing raw materials are first mixed with appropriate amount of fuel and flux, and an appropriate amount of water is added to form a mixed material after mixing and pelletizing, and then the mixed material is passed through a feeder and a distributing machine Disperse evenly on the sintering trolley, ignite and roast at high temperature to make the mixed mat...

AI Technical Summary

Problems solved by technology

In the process of realizing the present invention, the inventor found that in the prior art, NOx can be treated through the desulfurization and denitrification device at the end of the sintering system, but the cost of desulfurization and denitrification is quite expensive and the cost is very high

There is not yet an effective method to control NOx emissions in the prior art

Images