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A method for purifying tail gas containing nitrogen oxides

A technology of nitrogen oxides and exhaust gas, which is applied in the field of purifying exhaust gas containing nitrogen oxides and nitrogen oxides. It can solve the problems of not considering the impact of denitrification effect, not seeing the high gravity device, reducing the efficiency of NOx purification, etc., and achieving hysteresis Effects of phase separation, improved stability, and increased contact area

Active Publication Date: 2018-09-07
天津市翼腾云拓科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0061] In addition, conventional absorption devices do not consider the influence of the bubble size in the liquid phase on the denitrification effect
The size of the bubbles in the liquid phase is different, which not only reduces the purification efficiency of NOx, but also causes the treatment effect to be in an unstable state
[0062] At present, there is no report on the combination of high-gravity devices, especially static high-gravity devices and ultrasonic technology, for NOx exhaust gas treatment.

Method used

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  • A method for purifying tail gas containing nitrogen oxides
  • A method for purifying tail gas containing nitrogen oxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The tail gas volume of a catalyst production unit is 2000Nm 3 / h, the exhaust gas temperature is 450°C, and the maximum NOx content is 52700mg / m3 , O 2 The concentration is 1.8%, and as the production proceeds, the NOx concentration gradually decreases by 480mg / m 3 , O 2 The concentration was increased to 6.2%.

[0086] The whole tail gas treatment system is composed of denitration solution circulation unit, denitration solution cooling unit, tail gas distribution and delivery unit, reaction and gas-liquid separation unit.

[0087] The denitration solution circulation unit is composed of a denitration solution preparation tank, a circulating mother liquor storage tank, and a pump. The composition of the denitration solution is 2.0% of iminodiacetic acid, 0.5% of diethanolamine, 1.0% of urotropine, 0.3% of carboxymethyl cellulose, 0.1% of nonylphenol polyoxyethylene ether, 15% of urea, and the balance is water.

[0088] The denitrification solution cooling unit is co...

Embodiment 2

[0093] Different from Example 1, the composition and percentage of the denitrification solution are:

[0094] Iminodiacetic acid 3.5%, monoethanolamine 1.0%, urotropine 1.5%, carboxymethyl cellulose 0.4%, nonylphenol polyoxyethylene ether 0.15%, urea 25%, and the balance is water.

[0095] The NOx concentration in the tail gas at the outlet of the liquid separator is 17mg / m 3 .

Embodiment 3

[0097] The difference with embodiment 1 is:

[0098] The residence time of the liquid in the cyclone is 36 seconds, the frequency of the ultrasonic transducer is 50kHz, and the ultrasonic power is 3000W.

[0099] The NOx concentration in the tail gas at the outlet of the liquid separator is 22mg / m 3 .

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Abstract

The invention relates to a method for purifying nitrogen-containing oxide tail gas. In a static supergravity-ultrasonic reaction absorption device, air is used as an oxidant, NOx-containing oxide tail gas and a denitration solution perform contact reaction at the room temperature. The NOx removing process can be quickly and efficiently completed, so that the NOx concentration in the tail gas is reduced to be 30 mg / m<3> or below. The method is suitable for various NOx-containing treatments.

Description

technical field [0001] The invention belongs to the field of environmental protection waste gas treatment and relates to nitrogen oxides, in particular to a method for purifying tail gas containing nitrogen oxides. Background technique [0002] With the rapid development of the domestic economy, the discharge of nitrogen oxides (NOx) pollutants has increased rapidly, seriously polluting the ecological environment, and has become one of the important factors restricting social and economic development. The control of nitrogen oxides has become an urgent requirement for national economic sustainable development and environmental protection. [0003] Nitrogen oxides are one of the important precursors for the formation of ozone, and are also an important cause of regional fine particle pollution and haze. Tracking and monitoring shows that the proportion of nitrate ions in acid rain was about 1 / 10 in the 1980s, and it has risen to about 1 / 3 at present. If left unchecked, incr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/56B01D53/78B01D53/76B01D53/24B01D53/00
CPCB01D53/00B01D53/24B01D53/56B01D53/76B01D53/78B01D2251/2067B01D2259/816
Inventor 黄家英
Owner 天津市翼腾云拓科技有限公司
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