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Combined-type flue gas purification method

A combined, flue gas technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problems of limited application scope, poor chemical reaction selectivity, and high radiation energy.

Inactive Publication Date: 2016-05-25
WUXI QINGYANG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high energy of ray radiation, the selectivity for chemical reactions is poor, and side reactions are prone to occur, thus limiting the scope of application of this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016]First, the dust collector is used to remove dust from the flue gas, and then the SCR method is used to remove the nitrogen oxides in the flue gas. After removing the nitrogen oxides, the flue gas is sent to the desulfurization device, and the flue gas after desulfurization treatment is emptied. It is characterized in that: There is a nozzle in the desulfurization device, and the mixed solution of hydrogen chloride and hypochlorous acid is sprayed from the nozzle into the desulfurization device at the same time of desulfurization, wherein the molar ratio of hydrogen chloride and hypochlorous acid is 5-10:3-4, and in the desulfurization device The flue gas outlet is provided with a desulfurization bentonite adsorbent, and the preparation method of the desulfurization bentonite adsorbent is as follows: first prepare aluminum-based bentonite, mix and stir the bentonite and 5-10wt% aluminum chloride solution, let stand and settle, take out the supernatant and keep it for later ...

Embodiment 2

[0018] First, the dust collector is used to remove dust from the flue gas, and then the SCR method is used to remove the nitrogen oxides in the flue gas. After removing the nitrogen oxides, the flue gas is sent to the desulfurization device, and the flue gas after desulfurization treatment is emptied. It is characterized in that: There is a nozzle in the desulfurization device, and the mixed solution of hydrogen chloride and hypochlorous acid is sprayed from the nozzle into the desulfurization device at the same time of desulfurization, wherein the molar ratio of hydrogen chloride and hypochlorous acid is 5-10:3-4, and in the desulfurization device The flue gas outlet is provided with a desulfurization bentonite adsorbent, and the preparation method of the desulfurization bentonite adsorbent is as follows: first prepare aluminum-based bentonite, mix and stir the bentonite and 5-10wt% aluminum chloride solution, let stand and settle, take out the supernatant and keep it for later...

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PUM

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Abstract

The invention discloses a combined-type flue gas purification method. The combined-type flue gas purification method comprises following steps: firstly a dust remover is used for dust removing of flue gas; SCR method is adopted to remove nitrogen oxides in flue gas; after removing of the nitrogen oxides, the flue gas is delivered into a desulphurization device for desulfurization treatment, and then is discharged, wherein the desulphurization device is provided with nozzles; in the process of desulphurization, a mixed solution of hydrogen chloride and hypochlorous acid is sprayed into the desulphurization device via the nozzles, and bentonite absorbent is arranged at an exhaust gas outlet of the desulphurization device. Denitration efficiency of the combined-type flue gas purification method is 80% or higher, desulphurization efficiency is 98% or higher, at the same time demercuration efficiency is 80% or higher, dechloridation and defluorination efficiency is 95% or higher, oxydative degradation of a part of volatile organic pollutants is realized, and increasingly strict environmental protection requirements can be satisfied.

Description

technical field [0001] The invention relates to a combined flue gas treatment method that can be used in iron and steel plants and power plants. Background technique [0002] The flue gas produced by fuel combustion has caused increasingly serious harm to the atmospheric environment in my country. In addition, trace amounts of heavy metals mercury Hg, HCl, HF and volatile organic pollutants VOC have also attracted people's attention. At present, large-scale treatment and control of sulfur dioxide have been carried out, and the control of nitrogen oxides has also been increasingly put on the agenda. Mercury, chlorine, fluorine, and volatile organic pollutants have not yet been clearly required in coal-fired boilers in my country. With the development of my country's economy and society and the enhancement of people's awareness of environmental protection, these pollutants are bound to be gradually controlled. [0003] At present, the existing desulfurization technology can b...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/56B01D53/50B01J20/26B01J20/30
Inventor 唐靖岚
Owner WUXI QINGYANG MACHINERY MFG
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