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A wet denitrification system and method based on air catalytic oxidation to absorb flue gas

A catalytic oxidation and wet denitrification technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of low oxidant utilization rate, high oxidant cost, equipment corrosion, etc., and achieve low investment and operation costs, utilization High-efficiency, easy-to-operate effects

Active Publication Date: 2021-06-04
DONGHUA UNIV
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Problems solved by technology

At present, the oxidation absorption method that has been studied more is mainly O 3 method, NaClO 2 and its composite oxidation absorption method, ClO 2 method, KMnO 4 law, etc., but due to the O 3 , NaClO 2 Oxidants such as high cost, ClO 2 , KMnO 4 It will cause problems such as equipment corrosion and low utilization rate of oxidant, which will bring difficulties to the further research of this method

Method used

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  • A wet denitrification system and method based on air catalytic oxidation to absorb flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The XZCP-K-0.75 ultra-fine bubble generator produced by Yunnan Xiazhichun Environmental Protection Technology Co., Ltd. was selected as the micro-nano bubble generator, and an oxidation absorption tower with a volume of 50L was customized, and a 200L absorption liquid storage tank was customized. Assemble the wet denitrification system for oxidation and absorption of flue gas and check the air and water tightness of the system.

[0073] Prepare a mixed gas with a volume concentration of NO of 1250ppm. with FeSO 4 ·7H 2 O and MnSO 4 4H 2 O prepared Mn 2+ and Fe 2+ 40L of absorption liquid with a concentration of 2mmol / L is loaded into the oxidation absorption tower.

[0074] The inlet water pH of the micro-nano bubble generator is controlled to be 7, the inlet water flow is 12L / min, the inlet flow is controlled to be 50mL / min, and the inlet pressure is controlled to be 0.2MPa.

[0075] In the uncirculated state, the efficiency of primary oxidation NO absorption re...

Embodiment 2

[0077] The XZCP-K-0.75 ultra-fine bubble generator produced by Yunnan Xiazhichun Environmental Protection Technology Co., Ltd. was selected as the micro-nano bubble generator, and an oxidation absorption tower with a volume of 50L was customized, and a 200L absorption liquid storage tank was customized. Assemble the wet denitrification system for oxidation and absorption of flue gas and check the air and water tightness of the system.

[0078] Configure a mixed gas with a NO volume concentration of 3750ppm, use FeSO 4 ·7H 2 O and MnSO 4 4H 2 O prepared Mn 2+ and Fe 2+ 40L of absorption liquid with a concentration of 2mmol / L is loaded into the oxidation absorption tower.

[0079]The inlet water pH of the micro-nano bubble generator is controlled to be 7, the inlet water flow is 12L / min, the inlet flow is controlled to be 150mL / min, and the inlet pressure is controlled to be 0.2MPa.

[0080] In the uncirculated state, the efficiency of primary oxidation NO absorption is 93...

Embodiment 3

[0082] The XZCP-K-0.75 ultra-fine bubble generator produced by Yunnan Xiazhichun Environmental Protection Technology Co., Ltd. was selected as the micro-nano bubble generator, and an oxidation absorption tower with a volume of 50L was customized, and a 200L absorption liquid storage tank was customized. Assemble the wet denitrification system for oxidation and absorption of flue gas and check the air and water tightness of the system.

[0083] Configure a mixed gas with a NO volume concentration of 6250ppm, use FeSO 4 ·7H 2 O formulated Fe 2+ 40L of absorption solution with a concentration of 2mmol / L is loaded into the oxidation absorption tower.

[0084] The inlet water pH of the micro-nano bubble generator is controlled to be 7, the inlet water flow is 12L / min, the inlet flow is controlled to be 250mL / min, and the inlet pressure is controlled to be 0.2MPa.

[0085] In the uncirculated state, the efficiency of primary oxidation NO absorption is 34.1%.

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Abstract

The invention provides a wet denitrification system based on air catalytic oxidation to absorb flue gas. The tail gas outlet at the top of the oxidation absorption tower is connected to the gas mixing chamber, and the overflow port and the overflow return port on the side of the oxidation absorption tower are connected to the liquid storage tank. The absorption liquid inlet on the side of the oxidation absorption tower and the online monitoring sampling port are respectively connected to the absorption liquid storage tank and the first online concentration monitor. The bottom of the oxidation absorption tower is equipped with a micro-nano bubble inlet and an absorption liquid outlet; the gas mixing chamber is connected to the micro-nano bubble generator The micro-nano bubble generator is connected to the micro-nano bubble inlet; the absorption liquid storage tank is equipped with an absorption liquid containing an oxygen transfer catalyst; the liquid storage tank is connected to the second online concentration monitor and the nitric acid preparation system; the absorption liquid outlet is connected to the nitric acid preparation system connection. The invention also provides a wet denitrification method based on air catalytic oxidation to absorb flue gas. The invention has the advantages of simple structure, low cost, low energy consumption, high oxidant utilization rate, high denitrification efficiency and no secondary pollution.

Description

technical field [0001] The invention relates to a wet denitrification system, in particular to a wet denitrification system based on air catalytic oxidation of micro-nano bubbles to absorb flue gas, and belongs to the technical field of environmental protection. Background technique [0002] Among the various air pollutants whose emissions continue to grow in my country, NOx is the precursor that causes the most pollution problems. Its hazards to human health and the environment mainly include: toxic effects on the human body, damage to plants, and formation of acid rain Acid smog, photochemical smog formed with hydrocarbons, participation in the destruction of the ozone layer, etc., are known as the "culprit" and "killer" of air pollutants, posing a serious threat to the human living environment. NOx mainly includes NO, NO 2 , N 2 o 3 , N 2 o 4 , N 2 o 5 etc., more than 90% to 95% of which is NO, and NO is hardly absorbed by water or lye. Controlling NOx is the key t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/56B01D53/78
CPCB01D53/8625B01D53/90B01D2251/11B01D2258/0283B01D2259/124
Inventor 李登新肖政国阳光辉孙红蕊黄浩夏华磊姜东王雅萌张荣梁薛飞郭启浩王贝贝李玉龙郭庆峰王瑾曹露陈盛胡逸文杨天佑王飞坤袁晓玲嵇梦圆刘二燕梁程
Owner DONGHUA UNIV
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