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

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.

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...

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Problems solved by technology

[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 Emission Standards

At present, the more mature flue gas terminal denitrification technologies in the world include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). and technical issues

In order to reduce the cost of flue gas purification and improve the removal efficiency, extensive research has been carried out on flue gas denitrification at home and abroad. Among them, microwave irradiation activated carbon denitrification technology has the advantages of utilizing the reducibility of activated carbon and rapid and uniform microwave heating. High denitrification efficiency and good application prospects, but there are still many deficiencies and defects. Among them, CN101693162B uses continuous microwave irradiation to reduce NOx in flue gas by using activated carbon. Medium oxygen causes carbon loss and other problems

Patent CN102489107A uses intermittent microwave irradiation to reduce NOx. Although this method reduces the operating energy consumption of microwave reactors, it still cannot solve the problem of carbon loss caused by the existence of oxygen. In addition, this invention uses activated carbon as NOx adsorbent , is also not suitable, because the adsorption of activated carbon to NOx is a physical adsorption, and only at a lower temperature can it show a higher adsorption capacity. In actual production, in order to meet the anti-corrosion requirements of the flue gas pipeline, the flue gas temperature is generally higher.

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