A porous ceramic tubular filter catalytic denitrification unit and its flue gas purification method

A technology of tubular filtration and catalytic denitrification, applied in chemical instruments and methods, separation methods, filtration and separation, etc., can solve the problems of increasing the burden of wastewater treatment, reduce the impact of erosion and poisoning, improve production capacity and heat utilization efficiency, The effect of improving the recovery rate

Active Publication Date: 2021-09-07
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process will eventually lead to the accumulation of nitrite and nitrate in the absorption liquid, which will increase the burden on wastewater treatment

Method used

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  • A porous ceramic tubular filter catalytic denitrification unit and its flue gas purification method
  • A porous ceramic tubular filter catalytic denitrification unit and its flue gas purification method
  • A porous ceramic tubular filter catalytic denitrification unit and its flue gas purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present invention utilizes a small-scale flue gas purification device in a laboratory to carry out experimental research. The simulated alumina roasting flue gas is provided by calcining aluminum hydroxide and coal powder in a rotary kiln, and the flue gas volume is 100Nm 3 / h. After the flue gas at the outlet of the rotary kiln passes through the cooling device, it passes through two flue gas pipes and enters the separate porous ceramic tubular filter catalytic denitrification unit and SCR catalytic unit, and finally merges into a flue gas and then enters the subsequent flue gas deep evolution equipment . At the outlet of the cooling device downstream of the rotary kiln, a certain amount of heated ammonia is vaporized by a Venturi injection device and sprayed into the flue. The flue gas temperature is maintained at 400°C, and the NOx concentration is 400mg / Nm 3 , the dust concentration is 1g / Nm 3 , the filtration speed of the flue gas on the ceramic membrane is...

Embodiment 2

[0041] Utilize the same porous ceramic tubular filter catalytic denitrification unit as in Example 1 to carry out the experiment, the NOx concentration in the flue gas is 400mg / Nm 3 , spray a certain amount of vaporized ammonia water into the pipeline, and the ammonia / nitrogen ratio in the flue gas is about 0.8:1. After passing through the SCR reactor, the dust concentration in the flue gas is 0.7g / Nm 3 , NOx concentration is 140mg / Nm 3 , and the flue gas dust concentration after passing through the above-mentioned porous ceramic tubular filter catalytic denitrification unit of the present invention is 0.05g / Nm 3 , NOx concentration is 100mg / Nm 3 . It can be seen that the purification effect is far better than that of the SCR reactor.

Embodiment 3

[0043] Utilize the same porous ceramic tubular filter catalytic denitrification unit as in Example 1 to carry out the experiment, the NOx concentration in the flue gas is 400mg / Nm 3 , spray a certain amount of vaporized ammonia water into the pipeline, and the ammonia / nitrogen ratio in the flue gas is about 1:1. After passing through the SCR reactor, the dust concentration in the flue gas is 0.7g / Nm 3 , NOx concentration is about 110mg / Nm 3 , and the concentration of flue gas dust passing through the porous ceramic tubular filter catalytic denitrification unit of the present invention is 0.05g / Nm 3 , NOx concentration is about 70mg / Nm 3 . It can be seen that the purification effect is far better than that of the SCR reactor.

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Abstract

The invention relates to a porous ceramic tube filter catalytic denitrification unit and a method for purifying flue gas thereof, comprising a ceramic tube outer layer (1), a ceramic tube (2) and a porous catalytic inner part (3). The layer (1) is a microporous layer coated on the outer surface of the ceramic tube (2), and the porous catalytic internal part (3) is placed inside the ceramic tube (2). Compared with the prior art, the present invention first utilizes the filtering function of the micropore layer on the outer surface of the porous ceramic tube to filter and remove the dust material, and then utilizes the catalytically active material loaded on the inner layer of the ceramic tube to achieve the denitrification effect; inside the ceramic tube A porous ceramic ring with gas diversion and catalysis is installed to carry out deep denitrification reaction. The invention can significantly improve the recovery rate of the secondary drying material, strengthen the cleaning efficiency of the ceramic tube, and realize the purpose of deep denitrification, thereby improving the production capacity of the alumina roasting device and reducing the emission of pollutants.

Description

technical field [0001] The invention belongs to an integrated flue gas dedusting and denitrification removal technology in the field of environmental protection, and in particular relates to a porous ceramic tubular filter catalytic denitrification unit and a method for purifying flue gas. Background technique [0002] my country's aluminum output has ranked first in the world for more than ten consecutive years, but the alumina roasting process in the aluminum production process will emit a large amount of nitrogen oxides, which seriously pollutes the environment. At present, the concentration of NOx in alumina roasting flue gas is as high as 400-600mg / m 3 Around, much higher than the NOx concentration ≤ 100mg / m stipulated in the "Aluminum Industry Pollutant Discharge Standard" 3 specific emission limit requirements. Therefore, appropriate methods must be adopted for denitrification treatment of alumina roasting flue gas. [0003] At present, flue gas denitrification tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D46/24B01D39/20B01D53/56
CPCB01D39/2068B01D46/24B01D53/8628B01D53/8631B01D2255/20723B01D2255/20769B01D2255/20776B01D2258/0283
Inventor 瞿赞晏乃强范兰朱廷钰王雪
Owner SHANGHAI JIAOTONG UNIV
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