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Method and device for simultaneous reduction and oxidation of nitrogen oxides from airflow

A technology of nitric oxide and nitrogen oxides, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of expensive medicine, low absorption efficiency, and high operation and use costs, and achieve low operation and use costs and high treatment efficiency. The effect of large quantity and low investment cost

Inactive Publication Date: 2015-02-18
黄立维
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for nitrogen oxides containing more nitric oxide, because the Henry coefficient of nitric oxide in the solution is very small, the absorption efficiency is low, and the medicament is expensive, and the operating cost is high.

Method used

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  • Method and device for simultaneous reduction and oxidation of nitrogen oxides from airflow
  • Method and device for simultaneous reduction and oxidation of nitrogen oxides from airflow
  • Method and device for simultaneous reduction and oxidation of nitrogen oxides from airflow

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: A kind of circulating fluidized bed gas-solid reaction tower device of reducing and oxidizing nitrogen oxides method simultaneously from the gas stream such as figure 1 shown. The diameter of the reaction tower is Φ600mm, the tower height is 4000mm, and the material of the tower body is 316L stainless steel. The gas flow is introduced from the gas inlet at the lower part of the tower, passes through the gas distributor and the gas-solid reaction zone, and is discharged from the connecting pipe at the upper part of the tower through the gas outlet of the cyclone separator. The concentration of nitric oxide in the gas stream is 500ppm, the concentration of oxygen is 6%, and the balance is nitrogen. Ferrous chloride powder particles are used as the reactant, the average diameter is 0.2mm-0.5mm, the reaction temperature is 300°C, 400°C and 500°C respectively, the gas-solid contact time in the reaction tower is 2s, nitrogen oxides and chlorine The molar ratio...

Embodiment 2

[0024] Example 2: Using ferric chloride powdery particles as the reactant, the average diameter is 0.2mm-0.6mm, the reaction temperatures are 400°C, 500°C and 600°C respectively, the gas-solid contact time in the reaction tower is 2s, nitrogen oxidation The molar ratio of compound to ferric chloride is 1:2. Other conditions are with embodiment 1.

[0025] Experimental results: as shown in Table 2.

[0026] Table 2

[0027]

Embodiment 3

[0028] Example 3: Using manganese chloride powdery particles as the reactant, the average diameter is 0.3mm-0.6mm, the reaction temperatures are 450°C, 550°C and 650°C respectively, the gas-solid contact time in the reaction tower is 3s, nitrogen oxidation The molar ratio of compound to manganese chloride is 1:4. Other conditions are with embodiment 1.

[0029] Experimental results: as shown in Table 3.

[0030] table 3

[0031]

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Abstract

The invention discloses a method and a device for simultaneous reduction and oxidation of nitrogen oxides from airflow. According to a treating process, the treated airflow is guided into a gas-solid reaction tower, solid ferrous chloride, ferric chloride, manganese chloride or magnesium chloride metal chloride particles are guided into the gas-solid reaction tower simultaneously, and the metal chloride is decomposed at the high temperature and reacts with nitric oxide in the airflow, so that part of nitric oxide contained in the airflow is reduced to nitrogen, the rest nitric oxide is oxidized into nitrogen dioxide, generated nitrogen dioxide reacts with an alkaline absorbent easily to be removed, and the purpose of gas purification is achieved. The invention further discloses the special device. The method and the device have the characteristics of low investment cost as well as operation and application cost, simplicity in operation, high treatment efficiency and high treatment capacity.

Description

technical field [0001] The invention relates to a method and a device for simultaneously reducing and oxidizing nitrogen oxides from an air stream, in particular to waste gas treatment after fuel combustion, and belongs to the technical field of air pollution control and related environmental protection. Background technique [0002] Nitrogen oxides (NOx) produced by human activities x ) mainly includes NO and NO 2 , of which fuel combustion accounts for more than 90%, followed by nitric acid production, chemical and pharmaceutical nitration reactions, metal surface and semiconductor processing, etc. NOx is toxic to humans, and a large amount of nitrogen oxide emissions is also one of the main causes of atmospheric photochemical smog and acid rain. Statistical data in the Bulletin on the State of the Environment in China shows that the contribution of nitrogen oxides in acid rain in my country's cities is increasing, and the nature of acid rain pollution in some places has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/78B01D53/56
CPCY02A50/20
Inventor 黄立维
Owner 黄立维
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