Ammonia-carbon combined desulfurization and denitration method for sintering flue gas

A technology for sintering flue gas, desulfurization and denitrification, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of unsatisfactory treatment effect, low safety, high treatment cost, etc., and solve the problem of by-product utilization. , improve the denitrification rate, improve the effect of desulfurization and denitrification rate

Active Publication Date: 2017-05-10
CENT SOUTH UNIV
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Problems solved by technology

[0007] In order to solve the technical problems of unsatisfactory treatment effect, low safety, high treatment cost, and the need to pre-adsorb ammonia gas in the existing technical solutions for sintering flue gas, which is prone to secondary pollution, the present invention provides a sintering Flue gas ammonia carbon combined desulfurization and denitrification method, through the combined use of ammonia water and special activated carbon, aims to achieve high-efficiency desulfurization and denitrification, reduce secondary pollution, reduce process, etc.

Method used

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  • Ammonia-carbon combined desulfurization and denitration method for sintering flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Iron ore oxidized pellets are preheated to 400°C and added to the rotary kiln. The mass ratio of semi-coke (5-20mm) to iron ore oxidized pellets (5-16mm) is controlled at 2.5:1, and the temperature in the rotary kiln is controlled at 1050°C. The residence time of the control material in the kiln is 3 hours. The yield of the activated carbon product obtained is 60.3%, the metallization rate of the metallized material is 94.3%, and the iron grade is 89.10%. The properties of activated carbon products are as follows: 78.2% of the particle size is 5-15mm, and the specific surface area is 305cm 2 / g, pore volume 0.247cm 3 / g, moisture 0.90%, ash 9.0%, iodine adsorption 620mg / g, compressive strength 1300N / cm 2 .

[0099] The composition of flue gas is SO 2 The concentration is 2017mg / Nm 3 , NO concentration is 396mg / Nm 3 , CO concentration is 11250mg / Nm 3 , CO 2 The concentration is 7.5%, O 2 For sintering flue gas with a concentration of 13%, the flue gas flow rate ...

Embodiment 2

[0101] The activated carbon in this example is prepared by the following method: iron ore oxidized pellets are preheated to 900°C and added to a rotary kiln, and the mass ratio of semi-coke (5-20 mm) to iron ore oxidized pellets (5-16 mm) is controlled at 5:1 , The temperature in the rotary kiln is controlled at 900°C, and the residence time of the materials in the kiln is controlled to be 3 hours. The yield of the activated carbon product obtained was 79.0%, the metallization rate of the metallized material was 92.0%, and the iron grade was 86.21%. The properties of activated carbon products are as follows: 79.0% of the particle size is 5-15mm, and the specific surface area is 290cm 2 / g, pore volume 0.239cm 3 / g, moisture 0.8%, ash 9.0%, iodine adsorption 550mg / g, compressive strength 1240N / cm 2 .

[0102] The composition of flue gas is SO 2 The concentration is 2017mg / Nm 3 , NO concentration is 396mg / Nm 3 , CO concentration is 11250mg / Nm 3 , CO 2 The concentration i...

Embodiment 3

[0104] The activated carbon in this example is prepared by the following method: iron ore oxidized pellets are preheated to 750°C and added to a rotary kiln, and the mass ratio of semi-coke (5-20 mm) to iron ore oxidized pellets (5-16 mm) is controlled at 4.0:1 , The temperature in the rotary kiln is controlled at 1050°C, and the residence time of the materials in the kiln is controlled to be 1 hour. The yield of the activated carbon product obtained was 72.3%, the metallization rate of the metallized material was 94.3%, and the iron grade was 89.16%. The properties of activated carbon products are as follows: 79.6% of the particle size is 5-15mm, and the specific surface area is 290cm 2 / g, pore volume 0.223cm 3 / g, moisture 1.0%, ash 8.9%, iodine adsorption 610mg / g, compressive strength 1210N / cm 2 .

[0105] The composition of flue gas is SO 2 The concentration is 1720mg / Nm 3 , NO concentration is 396mg / Nm 3 , CO concentration is 13500mg / Nm 3 , CO 2 The concentration...

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Abstract

The invention discloses an ammonia-carbon combined desulfurization and denitration method for sintering flue gas. The sintering flue gas is desulfurized through ammonia-containing absorption liquid and then is adsorbed through activated carbon; the activated carbon is obtained by roasting carbonaceous materials and metallic oxide sources at a mass ratio of 2: 1 to 5: 1 at 850-1100 DEG C; the carbonaceous materials refer to semicoke or a mixture of coal and biomass. In the method, ammonia is cooperated with the activated carbon prepared through the method in use, desulfurization and denitration can be effectively achieved, secondary pollution is reduced, the process is cut short, and the treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection for sintering flue gas purification, and in particular relates to a method for jointly removing sulfur and nitrate by using ammonia water and activated carbon. Background technique [0002] The iron and steel industry is an important basic industry in my country, but it is also one of the major industrial polluters. According to the "2012 Environmental Statistical Annual Report", the iron and steel industry SO 2 The total emission is 2 million tons, accounting for the national SO 2 9.4% of total emissions; steel industry NO X The total emission was 540,000 tons, accounting for the national NO X 2.3% of total emissions. Sintering is one of the important processes in steel production, SO 2 The concentration is generally 80 ~ 1050ppm, NO X The concentration is generally 149 ~ 522ppm. Sinter plant SO 2 Emissions of iron and steel enterprises accounted for SO 2 40% to 60% of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01J20/20B01D53/50B01D53/02B01J20/30
CPCB01D53/02B01D53/507B01D2257/40B01J20/06B01J20/20
Inventor 朱德庆潘建郭正启李启厚李紫云梁钟仁
Owner CENT SOUTH UNIV
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