Control method of H2O (g) in sintering gas on high-proportion flue gas circulation condition

A technology of flue gas circulation and control method, which is applied in the direction of furnace components, energy efficiency improvement, process efficiency improvement, etc., and can solve problems such as slowing down of sintering speed, deterioration of sintering ore quality, reduction of sintering production efficiency and sintering ore quality, etc. Achieve the effect of reducing emissions, avoiding over-humidity, and reducing pollutant emissions

Active Publication Date: 2015-11-18
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

When the flue gas circulation ratio continues to increase, the H in the circulating flue gas 2 The O(g) content will increase rapidly, and the H introduced into the material surface 2 O(g) condenses in the lower material layer, causing the material layer to be too wet and affecting the air permeability during the sintering process, resulting in slower sintering speed and deterioration of sintered ore quality
Therefore, high proportion of flue gas circulation reduces sinter production efficiency and sinter quality

Method used

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  • Control method of H2O (g) in sintering gas on high-proportion flue gas circulation condition

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Embodiment 1

[0023] H in the sintering gas under the condition of a high proportion flue gas circulation of the present invention 2 The control method of O(g), its specific operation method is as follows:

[0024] The sintered material layer is divided into upper and lower layers by means of cloth (sintering raw material conditions: according to the mass ratio of mixed iron ore 61.22%, dolomite 5.01%, limestone 2.33%, quicklime 4.51%, sintered return ore 23.08%, coke powder 3.85% Ingredients (the main chemical components of the obtained sinter are: TFe57.7%, SiO 2 4.9%, R2.0, MgO1.8%)), the thickness of the lower material accounted for 20% of the thickness of the entire sintered material layer. Before the upper material is ignited, a sealed fume hood is added to introduce hot air to heat the lower material. The temperature of the hot air is 550°C. The length of the hot air hood accounts for 4% of the total length of the sintering machine. The method of high-proportion flue gas circulatio...

Embodiment 2

[0026] H in the sintering gas under the condition of a high proportion flue gas circulation of the present invention 2 The control method of O(g), its specific operation method is as follows:

[0027]The sintered material layer is divided into upper and lower layers by means of cloth (sintering raw material conditions: according to the mass ratio of mixed iron ore 61.41%, dolomite 5.61%, limestone 2.05%, quicklime 3.85%, sintered return ore 23.08%, coke powder 4.00% Ingredients (the main chemical composition of the obtained sinter is: TFe58.33%, SiO25.0%, R1.9, MgO2.3%)), the thickness of the lower layer of material accounts for 40% of the thickness of the entire sinter layer. Before the upper material is ignited, a sealed fume hood is added to introduce hot air to heat the lower material. The temperature of the hot air is 350°C. The length of the hot air hood accounts for 8% of the total length of the sintering machine. The method of high-proportion flue gas circulation is: ...

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Abstract

The invention discloses a control method of H2O (g) in sintering gas on a high-proportion flue gas circulation condition. The control method is characterized in that flue gas exhausted by a sintering machine is divided into tail flue gas, middle flue gas and head flue gas, of which the lengths account for 30-35%, 30-35% and 30-40% of the length of the sintering machine sequentially; on the high-proportion flue gas circulation condition, a sintering material layer is divided into an upper layer and a lower layer; before an upper layer material is ignited, a sealing flue hood is added, hot air is led in to heat a lower layer material, crystal water and free water in the lower layer material are removed in advance, and the content of H2O(g), used for circulation, in the middle flue gas of the sintering machine is reduced, thereby allowing the volume percentage of H2O(g) entering the gas of a sintering material surface to be below 8%, and meeting the requirement of high-proportion flue gas circulation on the gas quality; the high-proportion flue gas circulation means that low-content SO2 flue gas at the tail of and the flue gas in the middle of the sintering machine are circulated to the sintering material surface, with the flue gas circulation proportion being 50-60%.

Description

technical field [0001] The invention belongs to the sintering industry in the field of iron and steel metallurgy, and relates to a H 2 O(g) control method. Background technique [0002] Iron ore sintering is an important process in the steel production process, providing high-quality furnace materials for blast furnace ironmaking. However, because sintering has the characteristics of complex raw material composition and high temperature process, it is also a typical high energy consumption, high emission and high pollution link in the iron and steel production process. The amount of flue gas emitted by the sintering process accounts for 40% of the total amount of iron and steel enterprises, and the flue gas contains COx, SOx, NOx and other pollutants. Therefore, it is of great significance to the sustainable development of the iron and steel industry to reduce the emission of greenhouse gases and polluting gases in the sintering process. [0003] At the end of the 20th ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16F27D17/00
CPCY02P10/25
Inventor 甘敏范晓慧陈许玲季志云姜涛李光辉余志元周阳黄晓贤吕薇袁礼顺郭宇峰杨永斌黄柱成李骞张元波朱忠平许斌何向宁李强
Owner CENT SOUTH UNIV
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