Method for removing NOx in sintering flue gas through low-temperature SCR (Selective Catalytic Reduction) catalyst

An SCR catalyst, sintering flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of high cost of sintering flue gas denitrification catalyst, few cycles, and difficulty in large-scale promotion. , to achieve the effect of continuous and stable denitration ability, good low-temperature catalytic activity, and good mechanical strength

Inactive Publication Date: 2016-05-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems in the prior art, such as high cost of sintering flue gas denitrification catalyst, poor stability, few cycles and difficulty in large-scale promotion in sintering flue gas denitrification

Method used

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  • Method for removing NOx in sintering flue gas through low-temperature SCR (Selective Catalytic Reduction) catalyst
  • Method for removing NOx in sintering flue gas through low-temperature SCR (Selective Catalytic Reduction) catalyst

Examples

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Effect test

Embodiment 1

[0025] This example is obtained by conducting industrial tests in the sintering plant of Iron and Steel Company 1. The sintering machine area of ​​the steel plant is 450m 2 ,use figure 1 Shown technological process, comprises the following steps:

[0026] 1) The defective coke in the process of producing metallurgical coke in the coking plant is crushed and screened to obtain metallurgical coke with a particle size of 3-5mm;

[0027] 2) Wash the metallurgical coke obtained in step 1) with clean water, drain, and put the drained metallurgical coke into a drying oven for constant temperature drying at a temperature of 120° C. for 2 hours;

[0028] 3) The dried metallurgical coke obtained in step 2) is placed in a resistance furnace, and heated at a high temperature at a heating temperature of 800°C for a heating time of 6 hours, and a mixture of nitrogen and water vapor is introduced during the heating process;

[0029] 4) Prepare oxalic acid and ammonium metavanadate into so...

Embodiment 2

[0035] This example is obtained by conducting industrial tests in the sintering plant of Iron and Steel Company 2. The sintering machine area of ​​the steel plant is 360m 2 ,use figure 1 Shown technological process, comprises the following steps:

[0036] 1) The defective coke in the process of producing metallurgical coke in the coking plant is crushed and screened to obtain metallurgical coke with a particle size of 3-5mm;

[0037] 2) Wash the metallurgical coke obtained in step 1) with clean water, drain, and put the drained metallurgical coke into a drying oven for constant temperature drying at a temperature of 120° C. for 2 hours;

[0038] 3) The dried metallurgical coke obtained in step 2) is placed in a resistance furnace, and heated at a high temperature at a heating temperature of 800°C for a heating time of 6 hours, and a mixture of nitrogen and water vapor is introduced during the heating process;

[0039] 4) Prepare oxalic acid and ammonium metavanadate into so...

Embodiment 3

[0045] This embodiment is obtained by conducting industrial tests in the sintering plant of Iron and Steel Company 3. The sintering machine area of ​​the steel plant is 240m 2 ,use figure 1 Shown technological process, comprises the following steps:

[0046] 1) The defective coke in the process of producing metallurgical coke in the coking plant is crushed and screened to obtain metallurgical coke with a particle size of 3-5mm;

[0047] 2) Wash the metallurgical coke obtained in step 1) with clean water, drain, and put the drained metallurgical coke into a drying oven for constant temperature drying at a temperature of 120° C. for 2 hours;

[0048] 3) The dried metallurgical coke obtained in step 2) is placed in a resistance furnace, and heated at a high temperature at a heating temperature of 800°C for a heating time of 6 hours, and a mixture of nitrogen and water vapor is introduced during the heating process;

[0049] 4) Prepare oxalic acid and ammonium metavanadate into...

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Abstract

The invention discloses a method for removing NOx in sintering flue gas through a low-temperature SCR (Selective Catalytic Reduction) catalyst based on a metallurgy coke nut adsorbent. The method comprises the following steps: (1) smashing and sieving defective coke to obtain metallurgy coke nut; (2) cleaning the metallurgy coke nut with clear water, draining, and placing the drained metallurgy coke nut into a drying oven of which the temperature is 120 DEG C to perform constant-temperature drying for 2 hours; (3) performing high-temperature water vapor activation on the dried metallurgy coke nut; (4) selecting V2O5 to serve as an active component of the low-temperature SCR catalyst, selecting an ammonium metavanadate solution to serve as a precursor of V2O5, and soaking the metallurgy coke nut into a solution of which the V2O5 concentration is 6 percent and a solution of which the V2O5 concentration is 10 percent respectively for 16 hours through a soaking process to obtain a metallurgy coke nut low-temperature SCR de-nitration catalyst; (5) taking out a sample, placing the sample into an air blast drying box to dry for 3 hours, then placing the sample into a resistance furnace, and calcining in a nitrogen atmosphere at the temperature of 600 DEG C for 2 hours in order that the ammonium metavanadate is fully decomposed to obtain a V2O5-loaded modified metallurgy coke nut catalyst.

Description

technical field [0001] The invention relates to the field of metallurgical industry flue gas treatment in the field of atmospheric environmental protection, in particular to a method for removing NOx in sintering flue gas with a low-temperature SCR catalyst. Background technique [0002] The exhaust gas discharged from the metallurgical industry not only contains sulfur oxides, dioxins and other substances, but also contains a large amount of nitrogen oxides (NOx), which can cause environmental problems such as acid rain, photochemical smog, and ozone layer destruction. It is a recognized air pollution things. In my country, the total amount of NOx emitted by iron and steel metallurgical enterprises is about 1 million tons per year (48% of which comes from sintering plants). However, the sintering plants of most iron and steel metallurgical enterprises in my country have not yet adopted effective NOx control measures. Therefore, denitrification of sintering flue gas is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56B01J23/22
CPCB01D53/8628B01D53/90B01D2255/20723B01D2255/702B01D2257/404B01D2258/025B01J23/22
Inventor 任山赵齐刘清才姚璐孔明孟飞李琳杨剑蒋历俊郭富强
Owner CHONGQING UNIV
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