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Flue gas circulation and biomass energy combined iron ore sintering method

A technology of biomass energy and flue gas circulation, which is applied in the field of iron ore sintering, can solve the problems of high pollutant content in sintering flue gas, lack of emission reduction technology, and large equipment footprint, so as to reduce solid fuel consumption and SO2 content Low, emission reduction effect

Active Publication Date: 2011-11-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the sintering flue gas pollutant content of my country's iron and steel enterprises is high, and most of them fail to meet the emission standards. Most of the pollutants need to be reduced.
The types of pollutants treated in my country are still relatively single, mostly a single dust removal process, desulfurization process, denitrification process, etc. If all pollutants in the flue gas are to be treated, simply superimposing these processes will result in lengthy process and complicated treatment technology , equipment covers a large area, high investment, high operating costs and many other problems
Although the country has attached great importance to pollutant emission reduction in recent years, there is still a lack of emission reduction technologies with good technical and economic benefits.

Method used

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  • Flue gas circulation and biomass energy combined iron ore sintering method
  • Flue gas circulation and biomass energy combined iron ore sintering method
  • Flue gas circulation and biomass energy combined iron ore sintering method

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Effect test

Embodiment 1

[0028] According to the mass ratio of mixing 60.73% of iron ore, 5.58% of dolomite, 2.16% of limestone, 4.62% of quicklime, 23.08% of sintering return, and 3.85% of biomass charcoal (the chemical composition of sintered ore is: TFe57.5%, SiO 2 4.82%, R2.0, MgO2.0%). The density of biomass charcoal used is 1.2g / cm 3 , The fixed carbon content is 83.74%, the volatile matter is 7.55%, the calorific value is 30.77MJ / kg, the average particle size is 2.41mm and the content of -0.5mm is 23.58%. The biomass charcoal is mixed with other sintering raw materials, granulated, and distributed to the sintering machine. The flue gas is drawn from the sintering machine No. 16-22 wind boxes (a total of 24 wind boxes) to circulate to the sintering material layer using biomass as fuel. The circulating volume accounts for 30% of the total flue gas, and the fume hood accounts for 45% of the sintering machine. And add air to make the circulating flue gas composition O 2 14%, CO 2 5%, H 2 O(g) 7%, an...

Embodiment 2

[0033] According to the mass ratio of mixing iron ore 61.03%, dolomite 6.12%, limestone 2.27%, quicklime 3.50%, sintering return 23.08%, and biomass char 2 5.05%, R1.90, MgO2.20%). The density of biomass charcoal used is 1.3g / cm 3 , The fixed carbon content is 86.31%, the volatile matter is 5.22%, the calorific value is 31.89MJ / kg, the average particle size is 2.55mm and the -0.5mm content is 22.21%. The biomass charcoal is mixed with other sintering raw materials, granulated, and distributed to the sintering machine. The flue gas is drawn from the 15-22 wind boxes of the sintering machine (23 wind boxes in total) to circulate to the sintering material layer using biomass as fuel. The circulating volume accounts for 38% of the total flue gas, and the fume hood accounts for 50% of the sintering machine. And add air to make the circulating flue gas composition O 2 13%, CO 2 6%, H 2 O(g) 8%, the flue gas temperature is 180°C.

[0034] The output and quality indicators of sintered ...

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Abstract

The invention relates to a flue gas circulation and biomass energy combined iron ore sintering method. In the method, sintering flue gas which is positioned at the tail of a sintering machine and has high pollutant concentration is circulated to a sinter layer taking biomass as a fuel; the performance and using amount of the biomass fuel are controlled by controlling the components, temperature and circulating mode of circulating flue gas, so that flue gas circulation and biomass energy combined sintering heat transfer behavior and burning behavior have high matching property; therefore, the emission of harmful gas such as dioxin, NOx, CO and the like is reduced by flue gas circulation and CO2, SOx and the NOx are reduced by the biomass on the premise of ensuring the yield and quality index of a sintering ore, and the zero emission of COx is realized and the emission of dust, the dioxin, the NOx, the SOx and the like is greatly reduced through the synergic emission reduction effects of the flue gas circulation and the biomass.

Description

Technical field [0001] The invention belongs to the sintering industry in the field of iron and steel metallurgy, and relates to an iron ore sintering method combining flue gas circulation and biomass energy. Background technique [0002] The iron and steel industry is a typical high-energy-consuming and high-polluting industry, and its energy saving 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 based on the sinter-blast furnace process. Sinter is the main charge for blast furnace ironmaking, accounting for about 75% of my country. The energy consumption of the sintering production process is 9%-12% of the total energy consumption of the iron and steel enterprise, ranking second only to the ironmaking process, and the energy consumption index of sintering in my country is 20Kgce / t higher than advanced countries on average. s . In addition...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 范晓慧甘敏陈许玲姜涛李光辉张元波袁礼顺郭宇峰杨永斌李骞黄柱成白国华许斌季志云余志远李文琦谢路奔王强王祎
Owner CENT SOUTH UNIV
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