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Sintering flue gas denitration method

A technology for sintering flue gas and denitrification, which is applied in the direction of separation methods, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as large loss, difficulty in ensuring smooth operation of equipment, and low catalyst strength , to achieve the effects of reducing emissions, enhancing adsorption and selective catalytic reduction performance, and low cost

Active Publication Date: 2017-12-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing sintering flue gas denitrification process, under the conditions of heating and flue gas scouring, the strength of the catalyst is low and the loss is large, which makes it difficult to ensure the smooth operation of the equipment

Method used

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  • Sintering flue gas denitration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] After the desulfurized sintering flue gas is heated to 255°C, it is passed into the denitrification tower 4 with carbonaceous adsorption material inside with the water vapor of 250°C, and the ammonia vapor passed into the denitrification tower 4 is adsorbed on the carbonaceous Selective catalytic reduction is carried out under the action of materials, and the monitoring volume of sintering flue gas is 200,000 m 3 / h; The quality of the carbonaceous adsorbent material added in the denitrification tower 3 is 200kg. In terms of mass fraction, the carbonaceous adsorbent material composition is: Fe content is 10.72%, C content is 79.83%, CeO 2 The content is 0.92%, SiO 2 The impurity content is 6.81%, and the impurity content is 1.72%. 1.4mm accounts for 0.02%; the mass of continuous water vapor is 10kg; the conversion rate of nitrogen oxides in sintering flue gas can reach 90.3%, and the denitrification reaction equation expresses:

[0033]

[0034]

[0035] After t...

Embodiment 2

[0037] After the desulfurized sintering flue gas is heated to 310°C, it is passed into the denitrification tower equipped with carbonaceous adsorption materials with 330°C water vapor, and the ammonia vapor passed into the denitrification tower is under the action of carbonaceous adsorption materials. Selective catalytic reduction is carried out, and the monitoring volume of sintering flue gas is 800,000 m 3 / h; The quality of the new carbonaceous adsorption material added to the denitrification tower is 1500kg. In terms of mass fraction, the composition of the carbonaceous adsorption material is: Fe content is 14.39%, C content is 75.63%, CeO 2 The content is 0.21%, SiO 2The impurity content is 7.87%, and the impurity content is 1.90%. 1.4mm accounts for 0.06%; the mass of continuously fed water vapor is 115kg; the conversion rate of nitrogen oxides in sintering flue gas can reach 99.5%, and the denitrification reaction equation expresses:

[0038]

[0039]

[0040] A...

Embodiment 3

[0042] After the desulfurized sintering flue gas is heated to 390°C, it is passed into the denitrification tower with carbonaceous adsorption material inside with 400°C water vapor, and the ammonia vapor passed into the denitrification tower is under the action of carbonaceous adsorption material. Selective catalytic reduction is carried out, and the monitoring volume of sintering flue gas is 1.45 million m 3 / h; The quality of the new carbonaceous adsorption material added to the denitrification tower is 6000kg. In terms of mass fraction, the composition of the carbonaceous adsorption material is: Fe content is 13.72%, C content is 78.63%, CeO 2 The content is 0.58%, SiO 2 The impurity content is 5.25%, and the impurity content is 1.82%. 1.4mm accounts for 0.03%; the mass of steam introduced is 600kg; the conversion rate of sintering flue gas nitrogen oxides can reach 96.9%, and the denitrification reaction equation expresses:

[0043]

[0044]

[0045] After the exha...

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Abstract

The invention discloses a sintering flue gas denitration method. The method comprises the following steps: desulphurized sintering flue gas and water vapor are introduced into a denitrating tower provided with a carbon adsorption material, the above material and ammonia steam introduced into the denitrating tower are subjected to selective catalytic reduction under effect of the carbon adsorption material, and the sintering flue gas denitration is realized. Compared with the currently employed active carbon adsorption technologies, the carbon adsorption material has the advantages of high intensity, difficult obstruction of the micropores, and low cost, at the same time, the improved denitration technology is beneficial to increase the adsorption and selective catalytic reduction properties of the carbon adsorption material, enhances the denitration efficiency, reduce the denitration cost, and effectively reduces the discharge of nitrogen oxide, and the nitrogen oxide conversion rate is 90 and the above.

Description

technical field [0001] The invention belongs to the field of sintering flue gas treatment, in particular to a method for denitration of sintering flue gas. Background technique [0002] With the rapid development of my country's iron and steel industry, the output of crude steel ranks first in the world. However, the contradictions in the iron and steel industry are becoming more and more prominent. The iron ore sintering process is the main source of flue gas pollutants in the iron and steel industry, and its exhaust gas emissions account for 40% of the total exhaust gas in the iron and steel industry. Therefore, pollutant emissions need to be resolved urgently. an important subject. Studies have shown that the production of 1 ton of sintered ore produces about 4000-6000m 3 Among them, fine dust, sulfur oxides, nitrogen oxides, and dioxins are the main air pollutants. How to achieve low-cost and high-efficiency purification of flue gas is of great value to iron and steel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/54B01J20/20B01J23/83B01J20/30
CPCB01D53/8628B01D53/8631B01D2251/2062B01J20/06B01J20/20B01J23/83
Inventor 邢相栋陈云飞颜晗刘新刘漫博贾盼伟刘文果王静巨建涛
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY