Method for eliminating oxynitride from air flow and the special equipment thereof

A technology of nitrogen oxides and gas flow, applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve the problems of high requirements for catalyst operating conditions, great impact on catalyst life, and unsuitability for low-temperature emission sources, etc., to achieve The effect of low operating cost, low operation and use cost, and low cost of medicine

Inactive Publication Date: 2007-09-12
黄立维
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, there are two main methods for treating NOx exhaust gas: dry method and wet method. Among them, selective catalytic reduction (SCR), which is a dry method, is one of the main methods for treating fuel exhaust gas at present, but the catalyst has higher requirements on operating conditions. , Reducing agent ammonia is needed, sulfide and dust in the gas flow have a great impact on the life of the catalyst, the operating cost is high, and it is not suitable for the application of low-temperature emission sources. At present, non-equilibrium plasma technology (such as ZL 01121509.7) has been developed; The wet method uses various liquids to absorb NOx, and

Method used

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  • Method for eliminating oxynitride from air flow and the special equipment thereof
  • Method for eliminating oxynitride from air flow and the special equipment thereof
  • Method for eliminating oxynitride from air flow and the special equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Experimental device The system flow is shown in Figure 1, and the electrocatalytic oxidation reactor is shown in Figure 2. The structural size of the reactor is 400mm×400mm×1200mm, and it is composed of 6 sets of mesh electrode units superimposed, and the distance between the plates is 45mm. Mesh anode material is RuO 2 / Ti, the mesh cathode material is stainless steel. The size of the electrode mesh is 380mm×380mm, the thickness is 3mm, and the electrode mesh is 5mm×5mm. The absorption tower is a packed tower with a tower diameter of Φ600mm and a packing layer height of 3000mm. The simulated exhaust gas enters through the air inlet at the bottom of the tower, passes through the absorption reaction zone, and is discharged from the upper part.

[0027] The experimental conditions are: power supply parameters: DC voltage 15V, current 100A,

[0028] Exhaust gas composition: nitrogen oxides (NOx) / air

[0029] Gas flow: 800m 3 / h, gas temperature: 45°C

[0...

Embodiment 2

[0033] Embodiment 2: other conditions are the same as embodiment 1, the power supply parameter becomes direct current 20V, electric current 100A, sodium chloride solution, concentration 10%

[0034] Experimental results: as shown in Table 2

[0035] Import concentration

Embodiment 3

[0036] Embodiment 3: Other conditions are the same as Embodiment 1, the power supply parameters are pulse peak voltage 30V, pulse frequency 50Hz, pulse peak current 100A

[0037] Experimental results: as shown in Table 3

[0038] Import concentration

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Abstract

The method of eliminating nitrogen oxide from gas flow is to lead the gas flow into an absorption tower, where the NO2 in the gas flow is absorbed directly by the absorbing liquid, the NO is oxidized by the chlorine the electrically catalytic oxidizing reactor into NO2 absorbed by the absorbing liquid and nitrite ion in the absorbed product is further oxidized into chemically stable nitrate ion, so as to reach gas purification and avoid secondary pollution. The gaseous oxidant and liquid oxidant are regenerated through an electrolysis process, and the absorbed liquid is returned with the circulating pump to the absorbing tower for reuse. The method has high absorption efficiency, no need of throwing oxidant and greatly lowered running cost. The present invention also discloses corresponding apparatus.

Description

technical field [0001] The invention relates to the technical field of a method for removing nitrogen oxides in an air stream and related devices. Background technique [0002] Nitrogen oxides (NOx) produced by human activities x ) mainly includes NO and NO 2 , Among them, more than 90% are produced by fuel combustion, followed by nitric acid production, chemical and pharmaceutical nitration reactions, metal surface and semiconductor treatment, etc. NOx is toxic to humans. NO has a strong affinity with hemoglobin in the blood, which reduces the oxygen transport capacity of the blood. NO also causes damage to the central nervous system, causing pathological changes and paralysis. NO 2 It is a brown gas with a specific irritating odor, NO 2 Severely stimulate the respiratory system, nitrate the hemoglobin in the blood, and affect the heart, liver, and kidney hematopoietic tissues of the human body. A large amount of nitrogen oxide emissions is also one of the main causes ...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/86B01D53/14
Inventor 黄立维
Owner 黄立维
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