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Iron mine sintering flue gas segmented circulation method

A technology for sintering flue gas and flue gas components, applied in the field of iron ore sintering, can solve problems such as sulfur enrichment and environmental pollution

Active Publication Date: 2014-01-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current cycle process mostly uses one cycle, and it is difficult to achieve the maximum comprehensive emission reduction of various pollutants under the condition that the sinter is not enriched in sulfur
For example, the LEEP process and the EPOSINT process mainly circulate the flue gas at the tail of the sintering machine, because the SO in the flue gas at the middle tail 2 High concentration, SO 2 It is easy to be adsorbed in the sinter during the circulation process and lead to sulfur enrichment; while the circulation technology of Nippon Steel and Baosteel only circulates the high-temperature flue gas at the tail of the sintering machine, and contains high SO 2 , Dioxins / furans, PAHs, heavy metals, etc., have not been effectively treated. Even with desulfurization purification technology, dioxins / furans, PAHs, and heavy metals are easily adsorbed in desulfurization by-products and cause environmental pollution.

Method used

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  • Iron mine sintering flue gas segmented circulation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to the mass ratio of 60.73% mixed iron ore, 5.58% dolomite, 2.16% limestone, 4.62% quicklime, 23.08% sintered ore return, and 3.85% coke powder (the chemical composition of the obtained sintered ore is: TFe57.5%, SiO 2 4.82%, R2.0, MgO2.0%). The area of ​​sintering machine 1 is 450m 2 , a total of 24 bellows 5. The flue gas drawn from the wind boxes 5 (accounting for 1 / 6 of the length of the sintering machine) from the tail 21 to 24 of the sintering machine 1 is circulated to the head hood 2 of the sintering material layer at the head, and the temperature of the gas entering the material surface is 200°C, o 2 The content is 18%, and the head fume cover 2 accounts for 25% of the area of ​​the sintering machine 1. SO 2 The flue gas from No. 17-19 bellows 5 with the highest concentration is sent to the desulfurization system for desulfurization, and the flue gas from the remaining bellows 5 in the middle tail is circulated to the middle smoke hood 3 on the mi...

Embodiment 2

[0024] According to the mass ratio of mixed iron ore 61.03%, dolomite 6.12%, limestone 2.27%, quicklime 3.50%, sintered return ore 23.08%, anthracite 4.00% (the chemical composition of the obtained sintered ore is: TFe58.02%, SiO 2 5.05%, R1.90, MgO2.20%). The area of ​​sintering machine 1 is 360m 2 , a total of 20 bellows. The flue gas drawn from the No. 19-20 bellows 5 at the end of the sintering machine 1 (accounting for 1 / 10 of the length of the sintering machine) is circulated to the head hood 2 of the sintering material layer at the head, and the temperature of the gas entering the material surface is 300°C, O 2 The content is 19%, and the head hood 2 accounts for 15% of the area of ​​the sintering machine. SO 2 The flue gas from No. 16 to No. 17 wind boxes 5 with the highest concentration is sent to the desulfurization system for desulfurization, and the flue gas from the remaining wind boxes 5 in the middle and tail is circulated to the middle fume hood 3 on the mid...

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Abstract

The invention discloses an iron mine sintering flue gas segmented circulation method. Sintering flue gas high in O2 content on the tail portion of a sintering machine is circulated to the interior of a head flue cover of a sintering feed surface of the head portion of the sintering machine, flue gas of two to three bellows highest in SO2 content in a bellow on the tail portion of the sintering machine is conveyed to a desulfurization system to be desulfurized, and flue gas in other bellows is circulated to a middle flue cover of a sintering feed surface of the middle portion of the sintering machine. After segmented flue gas circulation is adopted, SO2 will not be accumulated in sintering ore, dust emission is reduced by 20-40%, NOx emission is reduced by 20-40%, dioxin emission is reduced by 50-80%, and CO2 emission is reduced by 20-45%.

Description

technical field [0001] The invention relates to a method for iron ore sintering, in particular to a method for reducing emission of sintering pollutants by flue gas circulation. Background technique [0002] The iron and steel industry is a typical high-energy-consuming and high-pollution industry, and its energy conservation and emission reduction are of great practical significance to the sustainable development of my country's national economy. The ironmaking system of my country's iron and steel industry is dominated by the sintering-blast furnace process, and sinter is the main charge of blast furnace ironmaking, accounting for about 75% in my country. The energy consumption of the sintering production process is high, and the flue gas emitted during the sintering process contains dust, COx, SOx, NOx, and highly carcinogenic substances such as dioxins and furans, and also emits various pollutants such as acid gases, heavy metals, and alkali metals. Due to its large amo...

Claims

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Application Information

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IPC IPC(8): F27D17/00
CPCY02P10/25
Inventor 甘敏范晓慧陈许玲姜涛李光辉袁礼顺余志元季志云邓琼黄云松黄晓贤黄柱成郭宇峰杨永斌张元波李骞白国华许斌周阳王剑曾金林
Owner CENT SOUTH UNIV
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