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Method for carrying out cooperated desulfuration and denitration on non-ferrous smelting fume by using cycling sodium-alkali method

A smelting flue gas, desulfurization and denitrification technology, applied in the field of flue gas desulfurization and denitration treatment, can solve the problems of inability to efficiently remove sulfur oxides and nitrogen oxides, lack of synergistic control technology for simultaneous reduction of sulfur and nitrate emissions, and achieve synergy Emission reduction, small flue gas volume, and low flue gas temperature

Inactive Publication Date: 2018-02-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Therefore, the existing flue gas purification technology in the non-ferrous metal smelting industry cannot achieve efficient removal of sulfur oxides and nitrogen oxides, and there is even a lack of synergistic control technology for simultaneous reduction of sulfur and nitrate emissions

Method used

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  • Method for carrying out cooperated desulfuration and denitration on non-ferrous smelting fume by using cycling sodium-alkali method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, a self-made rotary furnace is selected as the flue gas generating equipment, and lead concentrate powder and coal are used as mixed raw materials for roasting treatment to provide non-ferrous smelting flue gas close to the actual lead smelting section. Smoke volume is about 200m 3 / h, NO, SO in flue gas 2 The concentrations are 200mg / m 3 and 2000mg / m 3 . After passing through an electrostatic precipitator and an air heat exchanger, the exhaust gas at the outlet of the rotary furnace is introduced into a flue gas oxidation device, and an ozone generator (60g / h) is used to prepare ozone and then passed into the flue gas oxidation device. NO in the air is oxidized to NO 2 , where O 3 The molar ratio of / NO is about 0.9:1. The flue gas oxidized by ozone is introduced into the flue gas absorption tower, with Na 2 SO 3 Absorbing liquid for NO in flue gas 2 , SO 2 to absorb. The liquid-gas ratio of the absorption liquid to the treated flue gas is...

Embodiment 2

[0028] In this embodiment, the above-mentioned experimental system is also selected to carry out experimental research on sulfur / nitrate synergistic emission reduction. The flue gas volume is about 200m 3 / h, NO, SO in flue gas 2 The concentrations are 200mg / m 3 and 2000mg / m 3 . Oxidation of NO in flue gas to NO by ozone 2 , where O 3 The molar ratio of / NO is about 1.1:1. The flue gas oxidized by ozone is introduced into the flue gas absorption tower, with Na 2 SO 3 Absorbing liquid for NO in flue gas 2 , SO 2 to absorb. The liquid-gas ratio of the absorption liquid to the treated flue gas is 5L / m 3 . After monitoring the flue gas after the absorption tower, the results indicate that the treated flue gas NO, SO 2 Concentrations are: 10mg / m 3 and 100mg / m 3 , the flue gas denitrification and desulfurization efficiencies are 95% and 95% respectively.

Embodiment 3

[0030] like figure 1 As shown, a method for synergistic desulfurization and denitrification of non-ferrous smelting flue gas by using the circulating sodium-alkali method includes the following steps:

[0031] In the first step, the smelting flue gas with a temperature of 120-200°C after dust removal and cooling treatment is passed into the oxidation reactor (2);

[0032] In the second step, the ozone generated by the ozone generator 1 is passed into the oxidation reactor 2, and the molar ratio range of the ozone injected into the oxidation reactor 2 per unit time and the nitrogen oxides in the flue gas is 0.5-1.2, and the flue gas is separated by ozone. NO is oxidized to NO 2 ;

[0033] In the third step, the flue gas after the oxidation reaction is passed in the sulfur / nitrate absorption tower 3, and the main absorbent Na 2 SO 3 and enhanced absorbent sodium sulfide on SO in flue gas 2 , NO and NO 2 Simultaneous absorption is carried out, the clean flue gas is discharg...

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Abstract

The invention relates to a method for carrying out cooperated desulfuration and denitration on non-ferrous smelting fume by using a cycling sodium-alkali method. The method comprises the steps of adding ozone into the fume to convert NO into NO2, then, carrying out synchronous absorption on NO2 and SO2 coexisting in the fume by using sodium sulfite, then, strengthening a reduced denitrification action on nitrite and nitrate in an absorption solution by dint of an electrochemical method, regenerating produced sodium bisulfite by using steam heating and nitrogen gas protection, and meanwhile, carrying out nitrogen gas extracting concentration so as to obtain recoverable high-concentration SO2, so as to finally achieve the deep denitration, SO2 removal and recovery resource-converting of thesmelting fume. Compared with the prior art, the method has the advantages that by the method, NOx and SO2 can be synchronously and deeply removed from the fume, low-concentration SO2 can be concentrated and enriched, thus, recycling is facilitated, and the cost of desulfuration and denitration of chemical absorption is remarkably reduced, so that the method has extensive application value. The method is applicable to the desulfuration and denitration treatment of non-ferrous metal smelting fume and the like.

Description

technical field [0001] The invention belongs to the field of environmental flue gas treatment, and in particular relates to a method for synergistic desulfurization and denitrification of nonferrous smelting flue gas by using a circulating sodium-alkali method, which is suitable for flue gas desulfurization and denitrification treatment in nonferrous metal smelting enterprises equipped with an acid-making process. Background technique [0002] my country is a major producer of non-ferrous metals, and the output of ten conventional non-ferrous metals has ranked first in the world for more than ten consecutive years. The rapid development of non-ferrous metal smelting has not only promoted economic growth, but also brought about increasingly serious environmental problems, especially the most representative gas pollutants such as sulfur dioxide and nitrogen oxides emitted during the smelting process. In order to reduce the adverse impact of non-ferrous metal smelting on the at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/56B01D53/14C01B17/74
CPCB01D53/1425B01D53/1481B01D53/1493B01D53/56B01D53/76B01D2251/104B01D2252/10B01D2252/50B01D2258/025B01D2258/0283C01B17/74Y02C20/10Y02P20/151
Inventor 瞿赞晏乃强贾金平谢江坤方丽陈丽红
Owner SHANGHAI JIAO TONG UNIV
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