Purification technology and equipment of waste gas containing high concentration nitrogen oxide

A technology of nitrogen oxides and purification process, which is applied in the direction of chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve the problems of difficult to meet the treatment requirements and limited effect, and achieve small footprint, easy operation, and reduced treatment cost effect

Active Publication Date: 2006-09-13
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over the years, researchers have made improvements on this basis, including trying to use multiple towers in series for multi-stage absorption, using active fillers, etc., but the effect is very limited, it is difficult to meet the treatment requirements, and the phenomenon of "yellow smoke" is still very serious

Method used

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  • Purification technology and equipment of waste gas containing high concentration nitrogen oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The processing capacity of Example 1 is 700m 3 / h; the inlet concentration is about 18000mg / m 3 After being collected by the gas collecting hood under the action of the induced draft fan, the smoke gas enters the rotating packed bed 1 from the gas inlet 10, and diffuses into the rotating packing 4 under the action of the pressure difference, and the rotating packing speed is adjusted to 2400rpm. The dilute nitric acid solution with a concentration of 10% is sent from the circulation tank 20 to the liquid distributor 5 of the first rotating packed bed 1 by the circulation pump 9 and sprayed to the inside of the packing. The gas-liquid ratio is 1 / 50 (unit / liter). It is in countercurrent contact with the liquid in the filler and absorbed to remove the nitrogen dioxide and part of the nitrogen monoxide. Absorption liquid recovery treatment, the gas after the first absorption treatment is mixed with the ozone produced by the ozone generator 3 in the cavity of the outlet 11 to ox...

Embodiment 2

[0054] Processing capacity is 2000m 3 / h; the inlet concentration is about 10000mg / m 3 The concentrated smoke gas is collected by the air collecting hood under the action of the induced draft fan, and then enters the first rotating packed bed 1 from the air inlet 10, and the circulating pump 9 passes the 15% sodium carbonate solution in the first circulating tank 20 through the inlet The port 17 is driven into the liquid distributor 5 and enters the inner side of the rotating packing 4, where it reacts with the gas from the air inlet to remove part of the NO 2 , The rotating speed of the rotating packing is 2000rpm, and the liquid-gas ratio is 1 / 50 (unit / liter). The absorbed gas is discharged from the exhaust port 11 and enters the lower part of an oxidation tank, where it undergoes oxidation reaction with the hydrogen peroxide solution (0.2M) in the tank to oxidize the NO in the gas to NO 2 Then, it is discharged from the tank top into the pipeline 22, and enters the second rotat...

Embodiment 3

[0056] Processing capacity is 2000m 3 / h; the inlet concentration is about 10000mg / m 3 After the concentrated smoke gas is collected by the air collecting hood under the action of the induced draft fan, it enters the first rotating packed bed 1 through the air inlet 10, and undergoes absorption reaction with the sodium hydroxide solution entering the rotating packing to remove part of the NO. 2 , The gas after absorption is mixed and reacted with oxygen from the oxygen generator in the communication line 2, and the remaining NO is oxidized to NO 2 Then, it enters the second rotating packed bed 2 from the air inlet 12, and performs absorption reaction with the acidic urea absorption liquid in the rotating packing 6. The rotating speed of the rotating packing is 1200 rpm, and the liquid-to-air ratio is 1 / 100 (unit / liter). The absorption temperature is 20℃, the absorption pressure is 1atm, and the gas meets the GBI6297-1996 first-level emission standard.

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Abstract

A process for cleaning the waste gas containing high-concentration NOx includes such steps as gathering the fume, coming in rotary filler bed, diffusing into rotary filler, spraying the absorptive liquid to filler, countercurrent absorption, mixing the treated gas with oxidant to oxidize NO to NO2, coming in rotary filler bed, absorbing by absorptive liquid, defrosting, and exhausting. Said absorptive liquid can be cyclically used. Its apparatus is also disclosed.

Description

Technical field [0001] The invention relates to a process for treating exhaust gas containing nitrogen oxides, in particular to a process for treating industrial waste gas containing high concentration of nitrogen oxides and corresponding equipment. Background technique [0002] Every year, due to chemical processes such as nitrification, decomposition of nitro compounds, synthesis of nitro compounds, and production of nitric acid, a large amount of waste gas containing high concentrations of nitrogen oxides is commonly known as smoke. The industries involved include fertilizers, electroplating, gunpowder, explosives and many other industrial fields. The "high-concentration nitrogen oxides" refers to nitrogen-containing exhaust gas with a dark yellow color and a nitrogen oxide concentration hundreds to thousands of times higher than that of ordinary flue gas. Compared with ordinary smoke containing a small amount of nitrogen oxides, this kind of smoke is more harmful. In addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/18
Inventor 刘有智李裕王苏袁志国
Owner ZHONGBEI UNIV
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