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A kind of magnesium method flue gas desulfurization method

A flue gas and desulfurization tower technology, applied in the field of new magnesium method flue gas desulfurization, can solve the problems of increasing energy consumption of by-product recovery process, slow sulfite oxidation, secondary pollution of discharge liquid, etc. Oxidation, not easy to scale effect

Active Publication Date: 2018-06-15
GUANGDONG CENTURY TSINGSHAN NICKEL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the by-product sulfite oxidation is relatively slow, which increases the energy consumption of the by-product recovery process. Due to insufficient iq oxidation, it will cause secondary pollution of the discharge liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A novel magnesium method flue gas desulfurization method, is characterized in that, comprises the following steps:

[0029] (1) Removal of impurities: the flue gas discharged from the furnace enters the pretreatment tower, and the dust, heavy metals, fluoride ions and chloride ions in the flue gas are removed by clear water or alkaline water, and then the pretreated flue gas is sent to the desulfurization tower;

[0030] (2) Desulfurization: mature the magnesium oxide required for desulfurization into magnesium hydroxide slurry, mix it with sodium hydroxide slurry and send it to the desulfurization tower as a desulfurizer slurry, and the desulfurizer slurry is sprayed in the spray section of the desulfurization tower and mixed with flue gas SO in air 2 Contact reaction to obtain the clean flue gas of absorbing slurry and removing sulfur dioxide, wherein the mass ratio of magnesium hydroxide slurry to sodium hydroxide slurry is 1:0.1;

[0031] (3) Separation: the net f...

Embodiment 2

[0039] A novel magnesium method flue gas desulfurization method, is characterized in that, comprises the following steps:

[0040] (1) Removal of impurities: the flue gas discharged from the furnace enters the pretreatment tower, and the dust, heavy metals, fluoride ions and chloride ions in the flue gas are removed by clear water or alkaline water, and then the pretreated flue gas is sent to the desulfurization tower;

[0041] (2) Desulfurization: mature the magnesium oxide required for desulfurization into magnesium hydroxide slurry, mix it with sodium hydroxide slurry and send it to the desulfurization tower as a desulfurizer slurry, and the desulfurizer slurry is sprayed in the spray section of the desulfurization tower and mixed with flue gas SO in air 2 Contact reaction to obtain the clean flue gas of absorbing slurry and removing sulfur dioxide, wherein the mass ratio of magnesium hydroxide slurry to sodium hydroxide slurry is 1:0.5;

[0042](3) Separation: the net fl...

Embodiment 3

[0050] A novel magnesium method flue gas desulfurization method, is characterized in that, comprises the following steps:

[0051] (1) Removal of impurities: the flue gas discharged from the furnace enters the pretreatment tower, and the dust, heavy metals, fluoride ions and chloride ions in the flue gas are removed by clear water or alkaline water, and then the pretreated flue gas is sent to the desulfurization tower;

[0052] (2) Desulfurization: mature the magnesium oxide required for desulfurization into magnesium hydroxide slurry, mix it with sodium hydroxide slurry and send it to the desulfurization tower as a desulfurizer slurry, and the desulfurizer slurry is sprayed in the spray section of the desulfurization tower and mixed with flue gas SO in air 2 Contact reaction to obtain absorption slurry and clean flue gas from sulfur dioxide removal, wherein the mass ratio of magnesium hydroxide slurry to sodium hydroxide slurry is 1:0.2;

[0053] (3) Separation: the net flu...

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PUM

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Abstract

The invention discloses a novel magnesium-method flue gas desulphurization method. The novel magnesium-method flue gas desulphurization method includes the following steps that impurity removal, desulphurization, separation and oxidation are performed, the process conditions of the steps are reasonably controlled, a straw-sludge substrate catalyst is added to absorbing slurry in the oxidation step, air is led to perform oxidation till the nitrite content in detected wastewater is up to the discharge requirement, then standing and precipitation are performed to remove the straw-sludge substrate catalyst, and supernate is directly discharged. The method is high in desulphurization efficiency, the desulphurized sulfite is high in oxidation rate, the oxidation is complete, no secondary pollution is caused, the using amount of the oxidation catalyst is small, the catalytic efficiency is high, and the costs are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of atmospheric environment protection, in particular to a novel magnesium flue gas desulfurization method. Background technique [0002] The survival and development of human beings are inseparable from energy, and the combustion of fossil fuels such as coal will still be one of the main ways for human beings to obtain energy for a period of time even until the middle of this century or longer. While burning coal to provide energy, it also produces a large amount of SO 2 and air pollutants such as smoke and dust. due to SO 2 The acid rain caused by emissions has threatened countries all over the world, seriously restricting the sustainable development of the world economy and human health. Therefore, flue gas desulfurization is imperative. [0003] There are many salt lakes in my country. With the perennial mining of leading products such as potassium salt, table salt and thenardite, magnesium ions are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/79B01D53/50B01D47/00B01D47/06B01D53/75B01D53/78B01D53/64B01D53/68C02F9/04B01J23/75B01J23/34
CPCB01D47/00B01D47/06B01D53/14B01D53/1406B01D53/1493B01D53/502B01D53/64B01D53/68B01D53/75B01D53/78B01D53/79B01D2251/304B01D2251/402B01D2252/103B01D2258/0283B01J23/34B01J23/75C02F1/52C02F1/66C02F1/725C02F1/74C02F9/00C02F2101/166C02F2301/08
Inventor 王利军刘开云习雪康
Owner GUANGDONG CENTURY TSINGSHAN NICKEL IND CO LTD
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