Device and process for removing nitrogen oxides under synergistic effect of heteropolyacid and microwave irradiation

A technology of microwave irradiation and nitrogen oxides, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve the problems of unsolvable carbon loss, low denitrification rate, carbon loss, etc., and achieve good NOx removal performance , low cost of denitrification, easy to obtain raw materials

CN103990361AInactive Publication Date: 2014-08-20XUZHOU UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-08-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a device and a process for removing nitrogen oxides under a synergistic effect of heteropolyacid and microwave irradiation. According to the device, a flue gas conveying pipeline is connected to an inlet of an adsorption bed, an outlet of the adsorption bed passes through a tee valve and then is simultaneously connected to an active carbon bed in a microwave generator and a purified flue gas discharge pipeline, and a desorbing agent generating device is connected to the inlet of the adsorption bed by a tee valve. Flue gas containing NOx is input into the adsorption bed through the tee valve, purified flue gas is discharged through the tee valve, the adsorption bed after adsorption saturation is subjected to the stage of desorbing the NOx with water steam, the NOx which is adsorbed by an adsorbent is desorbed, simultaneously, the adsorbent is regenerated, the desorbed NOx is conveyed to a microwave irradiation type active carbon NOx reducing system through the tee valve, and the NOx is reduced into N2 by the active carbon. By using the device and the process, no oxygen exists in the NOx reducing process, equipment is simple, raw materials are easily obtained, the NOx removing performance is good, and the device and the process are easily operated and conveniently popularized.
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Description

technical field

[0001] The invention relates to a device and method for synergistic removal of nitrogen oxides by heteropolyacid and microwave irradiation. Background technique

[0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, which can lead to atmospheric environmental problems such as photochemical smog, acid rain, ozone layer destruction, and greenhouse effect. In addition, it can induce human respiratory diseases and lung lesions, seriously affecting human health. With the development of industry and the increase of the number of motor vehicles, NO x Every year, global emissions continue to grow. Based on this, stricter emission standards are formulated and more efficient NO x Removal technology is imminent.

[0003] NOx control technology includes source control technology and terminal control technology. The denitrification rate of source control technology is only 30% to 40%, which still cannot meet the increasingly stringent NOx em...

Examples

Embodiment 1

[0028] A method for synergistic removal of nitrogen oxides by heteropoly acid and microwave irradiation, the steps are as follows:

[0029] (1) Heteropolyacid adsorption of NOx in flue gas:

[0030] The flue gas containing NOx after dedusting and desulfurization is input through the flue gas input pipe 1, and enters the No. 1 adsorption bed 5-1 through the three-way valve 2-1, 2-2, and the flue gas after adsorption and purification is discharged through the three-way valve 2-4 . The adsorbent in the adsorption bed is phosphotungstic heteropolyacid H 3 PW 12 o 40 , the adsorption temperature is 150°C, and the flue gas space velocity is 5000h -1 .

[0031] After the adsorption is saturated, switch the three-way valve 2-1 so that the flue gas passes through the three-way valve 2-3 and enters the No. 2 adsorption bed 5-2, and the flue gas after adsorption and purification is discharged through the three-way valve 2-6;

[0032] The No. 1 adsorption bed after adsorption sa...