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Catalytic reduction denitration method for sintering flue gas of vanadium titano-magnetite

A technology for vanadium titanomagnetite and sintering flue gas is applied in the field of flue gas denitrification, which can solve the problems of complex process, high cost and difficult industrial implementation, and achieves the effects of high removal efficiency, low production cost and convenient implementation.

Active Publication Date: 2018-02-02
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: the existing flue gas denitrification method has problems such as high cost, complicated process, and difficult industrial implementation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Using the method of the present invention for flue gas denitration treatment

[0028] Mix blast furnace slag and vanadium extraction tailings in a ratio of 2:1. After quenching and tempering, the sieving rate of 400 meshes is controlled to 80%, Ti content is 20%, V content is 1%, Mn content is 0.5%, and Mg content. 0.5%, Cu content is 1%, the reaction temperature between the flue gas and the catalyst is 140℃, the reaction time is 10s, the ratio of the injected catalyst mass to the flue gas volume is 0.03g / Nm 3 When, NO X The catalytic reduction removal efficiency is 25-30%.

Embodiment 2

[0029] Example 2 Using the method of the present invention for flue gas denitration treatment

[0030] Mix the vanadium extraction tailings and titanium extraction tailings in a ratio of 1:2. After quenching and tempering, the sieving rate of 400 mesh is controlled to be 85%, the Ti content is 25%, the V content is 1.5%, and the Mn content is 0.5%. The Mg content is 1%, the Cu content is 1%, the reaction temperature of the flue gas and the catalyst is 150℃, the reaction time is 15s, and the ratio of the injected catalyst mass to the flue gas volume is 0.04g / Nm 3 When, NO X The catalytic reduction removal efficiency is 40-45%.

Embodiment 3

[0031] Example 3 Using the method of the present invention for flue gas denitration treatment

[0032] Mix the blast furnace slag, vanadium extraction tailings, and titanium extraction tailings in a ratio of 1:1:1. After quenching and tempering, the sieving rate of 400 mesh is controlled to be 90%, Ti content is 25%, V content is 1.5%, Mn The content is 1%, the Mg content is 1%, the Cu content is 1.5%, the reaction temperature between the flue gas and the catalyst is 160°C, the reaction time is 15S, and the ratio of the injected catalyst mass to the flue gas volume is 0.06g / Nm 3 When, NO X The catalytic reduction removal efficiency is 60-65%.

[0033] It can be seen from the examples that the reaction time, reaction temperature, and catalyst addition amount in the present invention are all related to NO X The removal efficiency of catalytic reduction is closely related. Increasing the reaction temperature, prolonging the reaction time and increasing the amount of catalyst can all ma...

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Abstract

The invention belongs to the technical field of flue gas denitration, and particularly relates to a catalytic reduction denitration method for sintering flue gas of vanadium titano-magnetite. The catalytic reduction denitration method for the sintering flue gas of the vanadium titano-magnetite aims at solving the problems that in existing flue gas denitration methods, costs are high, processes arecomplex, and industrial operation is uneasy to implement. The method comprises the following step of spraying catalysts into the sintering flue gas of the vanadium titano-magnetite for a reaction at140-160 DEG C for 10-15 s. The content of CO in the flue gas is higher than that of NO, and the catalysts are selected from one or more of blast furnace slag, vanadium-refined tail slag and titanium-refined tail slag. Without adding reducing substances, by adding side products of the vanadium titano-magnetite to convert NO in the flue gas into N2, the denitration efficiency can reach 60% or above,the production cost is low, and great convenience is provided for industrial implementation.

Description

Technical field [0001] The invention belongs to the technical field of flue gas denitration, and specifically relates to a method for catalytic reduction and denitration of vanadium-titanium magnetite sintering flue gas. Background technique [0002] With the improvement of environmental protection awareness, the country’s requirements for the steel industry’s emission standards have become more and more stringent. X Correspondingly, there are more stringent research and development of emissions. [0003] NOx mainly includes NO, N 2 O, NO 2 In the iron and steel industry, especially in the sintering process of vanadium-titanium magnetite, a large amount of NOx will be produced, and reducing NOx emissions has always been an urgent problem in the iron and steel industry. The existing methods to reduce NOx emissions mainly include the following: [0004] ①Selective catalytic reduction denitrification technology (SCR): Its principle is mainly to use CH at a certain temperature and with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8628B01D2255/2047B01D2255/20707B01D2255/20723B01D2255/2073B01D2255/20761B01D2258/0283
Inventor 王建山黎建明邱正秋张小龙
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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