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Method for treating flue gas pollutants through chemical oxidation absorption

A technology for chemical oxidation and pollutants, applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve the problems that the absorption liquid cannot be recycled and the denitrification efficiency cannot exceed 66.67%, so as to improve the effective utilization rate, Cost savings, power consumption, and quantity reduction effects

Inactive Publication Date: 2019-11-22
江苏联慧资源环境科技有限公司
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  • Application Information

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Problems solved by technology

However, based on its oxidation product as "NO 2 ", and the absorbent is the technical feature of "aqueous oxidant solution", its absorption reaction is still carried out under acidic conditions, and it is still reaction (7), even under the condition of NO oxidation rate of 100%, its denitrification efficiency still cannot exceed 66.67 %
However, the technical feature of using "aqueous oxidant solution" as the absorption liquid, its absorption capacity determines that the absorption liquid cannot be recycled.

Method used

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  • Method for treating flue gas pollutants through chemical oxidation absorption
  • Method for treating flue gas pollutants through chemical oxidation absorption
  • Method for treating flue gas pollutants through chemical oxidation absorption

Examples

Experimental program
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Embodiment 1 and 2

[0042] Flue gas treatment process 1:

[0043] A 360 square meter sintering machine with a flue gas volume of 1,200,000Nm 3 / h, flue gas SO 2 Concentration 2000mg / m 3 , NOx concentration 250mg / m 3 (in NO 2 total), of which NO accounts for 95%; NO 2 accounting for 5%. It is required to reach SO after flue gas treatment 2 Concentration 30mg / m 3 , NOx concentration 50mg / m 3 (in NO 2 meter) emission standards. The desulfurization unit adopts lime-gypsum wet flue gas desulfurization process, the oxidation unit uses ozone as the oxidant, and the absorption unit uses calcium hydroxide suspension as the circulating absorption liquid.

[0044] Its flue gas treatment process flow (process flow 1,) is as follows (see attached figure 1 ): Contains SO 2 The original flue gas with NOx enters the desulfurization unit (1) from the pipeline 1 (A1), the desulfurization agent calcium oxide enters the desulfurization unit (1) from the pipeline 2 (A2), and the desulfurization circulatin...

Embodiment 3 and 4

[0056] Flue gas treatment process 2:

[0057] A flat glass furnace with a flue gas volume of 120,000Nm 3 / h: flue gas SO 2 Concentration 1500mg / m 3 , NOx concentration 2500mg / m 3 (in NO 2 count). Requirements to reach SO 2 Concentration 30mg / m 3 , NOx concentration 400mg / m 3 (in NO 2 meter) emission standards. The desulfurization unit adopts the circulating fluidized bed dry flue gas desulfurization process, the oxidation unit uses hydrogen peroxide (Example 3) and the mixture of hydrogen peroxide and ozone (Example 4) as the oxidant, and the absorption unit uses sodium hydroxide solution as the circulating absorption liquid.

[0058] Its flue gas treatment process flow (process flow 2) is as follows (see attached figure 2 ): Contains SO 2 The original flue gas with NOx enters the desulfurization tower (6) through the pipeline B1 (B1), and the desulfurization agent calcium hydroxide particles enter the desulfurization tower (6) through the pipeline B2 (B2), and abs...

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Abstract

The invention relates to a method for treating flue gas pollutants by chemical oxidation absorption, which comprises the following steps: feeding flue gas containing nitrogen oxides and sulfur dioxideinto a desulfurization unit to remove the sulfur dioxide in the flue gas; feeding the desulfurized flue gas to an oxidation unit, and adding an oxidant into the desulfurized flue gas to oxidize NO inthe desulfurized flue gas into NO2; feeding the oxidized flue gas to a denitration unit, and circularly absorbing nitrogen oxides in the flue gas by adopting circulating absorption liquid the pH of which is not less than 7.0 to generate nitrites. According to the method, a high denitration efficiency under the condition of low oxidant consumption is realized, and the oxidant consumption is reduced by more than 1 / 3; the treatment requirement on a flue gas desulfurization system is reduced, the cost and the power consumption of a desulfurization agent are reduced, and the quantity of desulfurization products is reduced; separation of desulfurization and denitration products is realized, conditions are created for comprehensive utilization of flue gas treatment products, and the problem of compliance treatment of flue gas treatment products, restricting popularization and application of a chemical oxidation absorption method flue gas treatment technology, is solved. Compared with the prior art, the method has a project construction cost reduced by more than 20%.

Description

technical field [0001] The invention relates to the treatment of flue gas pollutants, in particular to the improvement of the flue gas treatment process of the chemical oxidation absorption method. Background technique [0002] With the continuous deepening of national energy conservation and emission reduction work, the flue gas purification treatment of non-electric industries has entered a critical stage. From a technical point of view, since the flue gas temperature in the non-electricity industry is much lower than that in the electric power industry, the combination of catalytic reduction denitrification + wet flue gas desulfurization (SCR+FGD) flue gas purification process commonly used in the electric power industry is difficult to apply in the non-electricity industry. It has been popularized and applied, and replaced by COA chemical oxidation and absorption co-processing technology. The principle of COA technology is through the oxidizing agent (O 3 , ClO 2 、H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/56B01D53/78
CPCB01D53/50B01D53/56B01D53/78
Inventor 陆泳凯陶树宝陈连方
Owner 江苏联慧资源环境科技有限公司
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