Method for reducing sulfur trioxide to sulfur dioxide in colored smelting flue gas

A technology for smelting flue gas and sulfur dioxide, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of large consumption of reducing agent, poor reduction selectivity, and high cost, and achieve low cost, high reduction rate, easy to use. obtained effect

Active Publication Date: 2019-02-22
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the defects of the prior art, such as large consumption of reducing agent, poor reduction selectivity, and high cost, in the process of removing sulfur trioxide from nonferrous smelting flue gas, the purpose of the present invention is to provide a method for reducing nonferrous smelting flue gas by using sulfur as a reducing agent. The method of sulfur trioxide in the gas, the elemental sulfur has good selectivity for the reduction of sulfur trioxide, the reduction efficiency is high, and the sulfur is easy to recover and reuse, and the consumption is low, which is beneficial to industrial production

Method used

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  • Method for reducing sulfur trioxide to sulfur dioxide in colored smelting flue gas

Examples

Experimental program
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Embodiment 1

[0030] Add 2200Kg sulfur (containing 95.4% sulfur) into the sulfur melting tank, turn on the heating switch, slowly raise the temperature to gradually melt the sulfur, and control the liquid sulfur temperature to 170±2°C. After the sulfur is completely dissolved, it is transported to the reduction tower with a high-pressure pump, and atomized into a mist through the nozzle, the atomization pressure is 5.5±0.2bar, and the atomization flow rate is 120kg / h. After the atomization is stable, open the sulfur dioxide flue gas (C SO2 12.4-13.8%, C SO3 0.64-0.69%, temperature 242-255 ℃) delivery switch, introduce flue gas into the reaction tower, control the flue gas flow rate to 1.8±0.1 million m 3 / h, so that the residence time of the flue gas in the reaction tower is greater than 30s. During operation, sulfur needs to be supplemented regularly to maintain the liquid sulfur level in the sulfur melting tank greater than 0.5m. Experiments show that the concentration of sulfur trioxi...

Embodiment 2

[0035] Add 2860Kg sulfur (containing 91.6% sulfur) into the sulfur melting tank, turn on the heating switch, slowly raise the temperature, gradually melt the sulfur, and control the liquid sulfur temperature to be 135±2°C. After the sulfur is completely dissolved, it is transported to the reduction tower with a high-pressure pump, and atomized into a mist through the nozzle, the atomization pressure is 6.5±0.2bar, and the atomization flow rate is 60kg / h. After the atomization is stable, open the sulfur dioxide flue gas (C SO2 20.4-22.1%, C SO3 0.86-0.94%, temperature 116-132 ℃) transfer switch, introduce flue gas into the reaction tower, control the flue gas flow rate to 0.6±0.1 million m 3 / h, so that the residence time of flue gas in the reaction tower is greater than 75s. During operation, sulfur needs to be supplemented regularly to maintain the liquid sulfur level in the sulfur melting tank above 0.5m. Experiments show that the concentration of sulfur trioxide in flue ...

Embodiment 3

[0040] Add 2450Kg sulfur (containing 92.6% sulfur) into the sulfur melting tank, turn on the heating switch, slowly raise the temperature, gradually melt the sulfur, and control the liquid sulfur temperature to be 185±2°C. After the sulfur is completely dissolved, it is transported to the reduction tower with a high-pressure pump, and is atomized into mist through the nozzle, the atomization pressure is 4.0±0.2bar, and the atomization flow rate is 210kg / h. After the atomization is stable, open the sulfur dioxide flue gas (C SO2 15.6-17.1%, C SO3 0.66-0.75%, temperature 296-307 ℃) delivery switch, introduce flue gas into the reaction tower, control the flue gas flow rate to 2.5±0.1 million m 3 / h, so that the residence time of flue gas in the reaction tower is greater than 36s. During operation, sulfur needs to be supplemented regularly to maintain the liquid sulfur level in the sulfur melting tank above 0.5m. Experiments show that the concentration of sulfur trioxide in flu...

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Abstract

The invention relates to a method for reducing sulfur trioxide to sulfur dioxide in a colored smelting flue gas. The method takes fusion sulphur or elemental sulfur as a reducing agent, the fusion sulphur or the elemental sulfur is pressurized and sprayed into a reaction tower, so that atomized sulfur liquid drops come into full contact and reaction with the sulfur trioxide in the flue gas, and the sulfur trioxide is thoroughly reduced into the sulfur dioxide. The method can avoid the formation of plenty of acidic wastewater caused by dissolution of the sulfur trioxide in the flue gas washingprocess, and the yield of sulfuric acid is improved. The sulphur reducing agent has good reduction selectivity, high utilization rate and low cost and has the advantages of simple process, no specialdevice requirement and high economic and environmental protection benefits and the like, and industrial application prospects are good.

Description

technical field [0001] The invention relates to a treatment method for nonferrous smelting flue gas, in particular to a method for reducing sulfur trioxide in nonferrous smelting flue gas to sulfur dioxide by using liquid sulfur, and belongs to the technical field of nonferrous metallurgical flue gas treatment. Background technique [0002] Sulfur dioxide flue gas produced during non-ferrous smelting roasting, smelting and pyrite roasting acid production often contains certain impurities such as dust particles, fluorine, chlorine, etc. Therefore, in order to ensure the quality of sulfuric acid products, it needs washing and purification treatment, that is, water is used as the The washing medium uses a dynamic wave washing system to wash and purify the flue gas. During washing and purification, dust particles, fluorine, and chlorine in the flue gas are captured by water, and sulfur trioxide is dissolved in water to form sulfuric acid. With the progress of washing, sulfuric a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/96
CPCB01D53/507B01D53/78B01D53/96B01D2251/20B01D2258/025B01D2258/0283
Inventor 李玉虎李云徐志峰曹才放田磊严康马艳丽
Owner JIANGXI UNIV OF SCI & TECH
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