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A multi-stage packed bed media barrier reactor for treating cyanide-containing waste gas

A medium barrier and reactor technology, applied in the field of ion treatment, can solve the problems of weak deep oxidation ability and large emission

Active Publication Date: 2016-12-07
张少强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, plasma technology is mainly used in deodorization and removal of volatile organic pollution. There are no reports on the treatment of HCN, and the deep oxidation ability of traditional plasma technology is weak, and it is easy to generate a large number of secondary by-products such as O 3 and NO x Wait
Many researchers put catalysts into the discharge area to build a packed-bed dielectric barrier discharge (PDBD) reactor, which can overcome the shortcomings of the DBD reactor to a certain extent, allowing pollutants to be deeply oxidized at the same time Reduce by-products, especially NO x However, since the traditional packed bed dielectric barrier (PDBD) reactor has only one discharge section, and the filler is the same catalyst, this makes the discharge energy in the discharge space relatively average and the oxidation capacity is the same, resulting in tail gas Middle O 3 The content is higher, and the emission is still large

Method used

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  • A multi-stage packed bed media barrier reactor for treating cyanide-containing waste gas
  • A multi-stage packed bed media barrier reactor for treating cyanide-containing waste gas
  • A multi-stage packed bed media barrier reactor for treating cyanide-containing waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Treatment of waste gas containing hydrogen cyanide in MPDBD reactor under different discharge lengths

[0034] The treatment object is hydrogen cyanide waste gas with the same concentration, the concentration is 100mg / m 3 , gas volume 1L / min, relative humidity 40-50%, applied voltage 12.0kV.

[0035] After the discharge was stable for 6 hours, sampling and analysis were carried out to measure the intake and output concentrations of hydrogen cyanide, the amount of carbon dioxide generated, and obtain the conversion rate and mineralization rate. The results are shown in Table 1:

[0036] Table 1

[0037]

[0038]

[0039] It can be seen from the above results that different discharge lengths have almost no effect on the conversion rate of HCN, and can reach 100% conversion, but have a great impact on the mineralization rate. When the discharge length ratio of each reactor is 4 / 100% mineralization at 4 / 2.

Embodiment 2

[0041] Treatment of waste gas containing hydrogen cyanide by MPDBD reactor under different applied voltages

[0042] The treatment object is a fixed concentration of hydrogen cyanide waste gas, the concentration is 100mg / m 3 , gas volume 1L / min, relative humidity 40-50%, the total discharge space of the reactor used is 96cm 3 .

[0043] After the discharge was stable for 6 hours, sampling and analysis were performed to measure the concentration of hydrogen cyanide in and out, and the amount of carbon dioxide generated to obtain the conversion rate and mineralization rate. The results are shown in Table 2:

[0044] Table 2

[0045]

[0046] It can be seen from the above results that different applied voltages have little effect on the conversion rate, but have a great impact on the mineralization rate. Low voltage is not conducive to the complete mineralization of hydrogen cyanide. When the applied voltage reaches 12.0kV, the cyanide The conversion rate and mineralization...

Embodiment 3

[0048] Comparison of treatment effects between the multi-stage packed bed dielectric barrier discharge reactor of the present invention and the traditional single-stage packed bed dielectric barrier discharge reactor

[0049] The total discharge space of both reactors used is 96 cm 3 , gas volume 1L / min, relative humidity 40-50%, applied voltage 12.0kV, after 6 hours of stable discharge, take samples and analyze, measure the inflow and outflow concentrations of hydrogen cyanide, the amount of carbon dioxide produced, and obtain the conversion rate and mineralization The comparison results are as follows in Table 3:

[0050] table 3

[0051]

[0052] As can be seen from the above results, compared with the traditional single-stage packed bed dielectric barrier reactor, although the new multi-stage dielectric barrier reactor does not significantly improve the mineralization rate of hydrogen cyanide, it is only (10%) , but the NO and O in the exhaust 3 The content is greatl...

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Abstract

The invention provides a multi-stage packed bed dielectric barrier reactor for processing a cyanide-containing waste gas. The reactor mainly comprises three reaction zones Cell I, Cell II and Cell III with different functions, wherein a pollution gas is fed from the Cell I, is deeply hydrolyzed and oxidized, and is fed to the Cell II; intermediate products CO and NO are further oxidized into CO2 and NO2; meanwhile, the generated O3 is consumed; finally, the residual O3 is consumed through the Cell III; and NO is completely oxidized into NO2 and then is absorbed by an absorption liquid. According to the multi-stage packed bed dielectric barrier reactor for processing the cyanide-containing waste gas provided by the invention, a traditional PDBD reactor is divided into two stages; different catalysts are respectively added as packing, so as to form a two-stage PDBD reactor; third packing is added to the tail end of a discharge area; and the discharge area does not participate into the discharge reaction process, so that emission of the tail gas up to the standard is reached.

Description

technical field [0001] The invention relates to a plasma treatment technology for waste gas containing hydrogen cyanide (HCN) in the field of electroplating, in particular to a novel multi-stage dielectric barrier reactor for treating waste gas of cyanide. Background technique [0002] HCN Hydrogen cyanide (HCN) is a highly toxic substance and one of the most typical "unconventional" toxic and harmful pollutants in industrial waste gas. Its toxicity is 35 times that of CO, and its poisoning mechanism is mainly cyano (CN - ) in the human body is easy to interact with Fe in the oxidative cytochrome oxidase in the mitochondria of cells 3+ binding, thereby preventing the Fe 3+ Due to the strong toxicity of HCN, the emission concentration limit of HCN is getting higher and higher. Therefore, the purification and pollution control of HCN is imperative. [0003] The traditional methods of treating HCN mainly include absorption and liquid-phase catalytic oxidation, adsorption, co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/75B01D53/54
Inventor 张少强
Owner 张少强