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 steps of obtaining the current nitrogen oxide emission state; obtaining the current positional state of a sintering final point; and according to the current nitrogen oxide emission state, the current positional state of the sintering final point and a preset strategy, adjusting the temperature of a material layer. According to the nitrogen oxide emission control method and device, the temperature of the material layer is adjusted according to the current nitrogen oxide emission state, the current positional state of the sintering final point and the preset strategy, so that on the premise that it is guaranteed that the sintering final point is at the reasonable position,the temperature of the material layer is properly raised, and the sintering speed, namely the vertical sintering speed, achieved in the sintering process can be increased; thus, the thickness of a burning belt is reduced; furthermore, the generation probability of nitrogen oxide is lowered; the cost is low, and in addition, physical properties of sintered ore are not affected; and quality of the sintered ore can be guaranteed.

Description

Technical field [0001] The invention relates to the field of metallurgical technology, in particular to a method and device for controlling nitrogen oxide emission. Background technique [0002] With the rapid development of modern industry, the scale of steel production has become larger and larger, and energy consumption has also increased. Energy conservation and environmental protection have become important indicators in steel production. In steel production, iron-containing raw material ore needs to undergo sintering treatment before entering the blast furnace for smelting. In the sintering process, first mix various powdered iron-containing raw materials into proper amount of fuel and flux, and add proper amount of water. After mixing and pelletizing, a mixture is formed, and then the mixture is passed through a feeder and a distributor. Evenly spread on the sintering trolley, high-temperature roasting after ignition, the mixture material undergoes a series of physical an...

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

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