Method for flue gas denitration through partial oxidation, absorption and recycle

A flue gas and oxidation tower technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems of oxidant consumption and high operating costs, reduce consumption, reduce operating costs, and realize denitrification and resource utilization Effect

Inactive Publication Date: 2015-10-07
CHENGDU UNIV OF INFORMATION TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

These methods have some unresolved key problems. In addition, the oxidant ...

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  • Method for flue gas denitration through partial oxidation, absorption and recycle

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The flue gas denitrification test is carried out in the device shown in the attached figure. The oxidation tower is a glass spray tower with a diameter of 100mm and a height of 100cm. The gas-liquid two-phase countercurrent flow is 30m. 3 / h, the oxidant is hydrogen peroxide, the concentration is 0.1mol / L, the liquid spray volume is 100L / h, the temperature is 40°C, the pH value is 5, and the NO inlet concentration is 1200mg / m 3 , the flue gas residence time is 3 seconds, the denitrification tower is a glass spray tower with a diameter of 100mm and a height of 100cm, the mass concentration of sodium hydroxide is 6%, the liquid spray volume is 150L / h, the temperature is 40°C, and the pH value is 9 , the NO inlet and outlet concentration in the flue gas was measured by the KM940 flue gas analyzer of the British Kane company, and the NO outlet concentration was 75 mg / m after the operation was stable. 3 , the removal rate was 93.8%, and sodium nitrate solid was obtained.

Embodiment 2

[0031] The test device is the same as that of Example 1, the gas-liquid two-phase counterflow, and the flue gas flow rate is 30m 3 / h, the oxidant is potassium permanganate, the concentration is 0.15mol / L, the liquid spray volume is 50L / h, the temperature is 40°C, the pH value is 6, and the NO inlet concentration is 1200mg / m 3 , the flue gas residence time is 3 seconds, the mass concentration of the lye in the denitrification tower is 6% sodium hydroxide, the liquid spray volume is 150L / h, the temperature is 40°C, the pH value is 9, and the concentration of NO in the flue gas is Measured by the KM940 flue gas analyzer of the British Kane company, the NO outlet concentration after the operation is stable is 56 mg / m 3 , the removal rate was 95.3%, and sodium nitrate solid was obtained.

Embodiment 3

[0033] The test device is the same as that in Example 1, the gas-liquid two-phase counterflow, and the flue gas flow rate is 40m 3 / h, the oxidant is sodium hypochlorite, the concentration is 0.15mol / L, the liquid spray volume is 60L / h, the temperature is 40°C, the pH value is 6, and the NO inlet concentration is 1100mg / m 3 , the flue gas residence time is 2.5 seconds, the lye in the denitrification tower is ammonium carbonate with a mass concentration of 8%, the liquid spray volume is 100L / h, the temperature is 40°C, and the pH value is 9. Measured by the KM940 flue gas analyzer of British Kane Company, the outlet concentration of NO is 65 mg / m after the operation is stable 3 , the removal rate was 94.1%, and sodium nitrate solid was obtained.

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Abstract

The invention discloses a method for flue gas denitration through partial oxidation, absorption and recycle. Flue gas passes through a liquid phase oxidizing agent in an oxidation tower, the flue gas residence time and the concentration of the oxidizing agent are controlled, about 45-50% of NO in the flue gas is oxidized into NO2, then the gas flue is sprayed and absorbed by an alkali liquor in a denitrating tower for generating nitrite, and finally air is pumped into the bottom of the denitrating tower for oxidizing nitrite into nitrate, thereby realizing flue gas denitration through partial oxidation, absorption and recycle. The invention employs traditional absorption process with mild operation condition, and the process is carried out at normal temperature and under normal pressure with a high denitration rate and low operation cost, thereby realizing NOx recycling.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment and control, in particular to flue gas denitrification, especially partial oxidation and resource absorption denitrification. Background technique [0002] The harm caused by man-made NOx pollution is huge. In addition to the direct harm, it will also react with other substances in the atmosphere under certain conditions to generate nitrate ions (NO 3 - ), ozone (O 3 ) and fine particles and other secondary pollutants, which lead to secondary pollution problems such as photochemical pollution, atmospheric acid deposition, near-surface ozone and water eutrophication. and the focus of scholars' attention. Therefore, the development of flue gas denitrification technology is another major issue that needs to be solved urgently after flue gas desulfurization. Technology is imminent. [0003] Currently researched and developed flue gas denitrification technologies mainly include gas phas...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/56
Inventor 刘盛余
Owner CHENGDU UNIV OF INFORMATION TECH
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