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Method and device for removing sulfur trioxide from smelting flue gas

A technology for smelting flue gas and sulfur trioxide, applied in chemical instruments and methods, separation methods, gas treatment, etc., to achieve the effects of reducing treatment costs, reducing the generation of gypsum slag, and avoiding consumption

Active Publication Date: 2020-05-19
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the existing technical problems when using sulfur powder or hydrogen sulfide as a reducing agent to reduce sulfur trioxide in flue gas, the purpose of this invention is to provide a method for removing sulfur trioxide from smelting flue gas, which is ingenious In flue gas, add reducing agent 1 for removing residual oxygen in flue gas and reducing agent 2 for reducing sulfur trioxide or only add reducing agent 3 for selectively reducing sulfur trioxide to ensure that SO in flue gas 3 Smoothly restored to SO 2 , reduce or avoid the unnecessary consumption of reducing agent 2 and reducing agent 3, and greatly improve the SO 3 The reduction speed and its reduction efficiency

Method used

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  • Method and device for removing sulfur trioxide from smelting flue gas
  • Method and device for removing sulfur trioxide from smelting flue gas
  • Method and device for removing sulfur trioxide from smelting flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The flow rate is 5000m at a temperature of 965°C 3 / h of smelting flue gas, first take a sample at the flue inlet to analyze and measure the SO in the flue gas 3 content, and then according to the measurement results according to SO 3 reduced to SO 2 2.5 times of the theoretical amount, put ammonia gas into the flue gas at the entrance of the flue, mix and reduce it, it takes 13 seconds for the flue gas to go from the entrance to the exit of the flue, and finally take a sample at the exit of the flue to measure the amount of ammonia in the reduction tail gas According to the measurement results, adjust the amount of ammonia in time to ensure the SO in the flue gas 3 It is reduced, and the added ammonia is effectively utilized. At the same time, samples are taken to analyze the composition of the flue gas washing liquid, and the changes in the composition of the washing liquid before and after flue gas reduction are tracked. Smelting flue gas ammonia reduction SO remo...

Embodiment 2

[0048] The flow velocity is 7500m at a temperature of 1105°C 3 / h of smelting flue gas, first take a sample at the flue inlet to analyze and measure O in the flue gas 2 and SO 3 content, and then add pulverized coal at the near end of the flue entrance according to the measurement results, adjust the flue gas to be weakly reducing, and then press SO at the far end of the flue entrance 3 reduced to SO 2 1.5 times the theoretical amount, put sulfur vapor into the flue gas at the entrance of the flue, mix and reduce, the flue gas takes 18 seconds from the entrance to the exit of the flue, and finally take a sample at the exit of the flue to measure the sulfur vapor in the reduction tail gas According to the measurement results, adjust the amount of pulverized coal and sulfur vapor in time to ensure the SO in the flue gas 3 The added pulverized coal and sulfur are effectively utilized. At the same time, samples are taken to analyze the composition of the flue gas washing liquid...

Embodiment 3

[0052] The flow rate at a temperature of 750°C is 2500m 3 / h of smelting flue gas, first take a sample from the flue gas to analyze and measure the SO in the flue gas 3 content, and then press SO in the branch pipe of the flue according to the measurement results 3 reduced to SO 2 Ammonium sulfite is added to 2.5 times the theoretical amount, ammonium sulfite is decomposed by heat to release ammonia gas, ammonia gas is mixed with flue gas, and the SO 3 Selective reduction and removal, the flue gas takes 11 seconds from the addition of ammonium sulfite to its discharge from the flue, timely samples are taken at the outlet of the flue gas to measure the residual amount of ammonia in the reduction tail gas, and the amount of ammonium sulfite added is adjusted according to the measurement results. Ensure SO in the flue gas 3 Effective reduction is obtained, and at the same time, samples are taken to analyze the composition of the flue gas washing liquid, and the changes in the ...

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Abstract

The invention discloses a method and a device for removing sulfur trioxide from smelting flue gas. According to the method,smelting flue gas is in contact with a reducing agent in aflue gas channel, and residual oxygen in the melting flue gas is removed; thenSO3 in the smelting flue gas is reduced into SO2,or the removal of oxygen in the smelting flue gas and the reduction of SO3 are synchronouslycarried out,or SO3 in the smelting flue gas is selectively reduced into SO2; the reduced flue gas is used for producing sulfuric acid; waste is changed into valuables, the recovery rate of sulfur inthe smelting process is increased, so that accumulation of sulfuric acid in a flue gas spraying washing liquid is reduced or avoided, gypsum residues in the flue gas washing wastewater treatment process are greatly reduced, the smelting flue gas washing wastewater treatment cost is reduced, the solubility of fluorine and chlorine in theflue gas washing liquid is remarkably improved, pollution is reduced, and the environment is protected. The method has the advantages of simple process, good SO3 removal effect, low cost and the like, and is suitable for industrial application of comprehensive treatment of the smelting flue gas.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method and a removal device for removing sulfur trioxide from smelting flue gas. Background technique [0002] The flue gas produced by smelting copper, lead, zinc, etc. needs to be sprayed, washed, dust-removed and purified before acid production. 2 SO 3 , with flue gas scrubbing, SO 3 And F and Cl are continuously dissolved into the washing liquid, so that the acidity of the washing liquid (H 2 SO 4 Concentration), and the concentration of hydrochloric acid and hydrofluoric acid is getting higher and higher, and the washing liquid eventually becomes dirty acid containing Cu, Fe, Pb, Zn, Cd, As, etc. and F and Cl. At present, the polluted acid produced by smelting flue gas washing is generally treated by sulfide-lime neutralization method. The so-called sulfidation is to add sodium sulfide or sodium hydrosulfide to the acidic waste water for washing sme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/76B01D53/78
CPCB01D53/50B01D53/501B01D53/76B01D2258/0283
Inventor 王学文王懿孟钰麒王明玉
Owner CENT SOUTH UNIV