Method for removing nitrogen oxide in airflow

A nitrogen oxide, gas flow technology, applied in chemical instruments and methods, separation methods, gas treatment and other directions, can solve the problems of expensive pharmaceuticals, low absorption efficiency, high operation and use costs, and achieve safe use, large processing capacity, and operating costs. low effect

Inactive Publication Date: 2016-05-04
黄立维
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  • Application Information

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Problems solved by technology

However, for nitrogen oxides containing more nitric oxide, the absorption efficiency is low due to the low

Method used

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  • Method for removing nitrogen oxide in airflow
  • Method for removing nitrogen oxide in airflow
  • Method for removing nitrogen oxide in airflow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: a kind of circulating fluidized bed gas-solid reaction tower device of the method for removing nitrogen oxides in the gas stream is as figure 1 shown. The circulating fluidized bed gas-solid reaction tower has a tower diameter of Φ60 mm, a tower height of 2500 mm, and a tower body made of 316L stainless steel. The concentration of nitrogen oxides (about 90% nitric oxide) in the gas stream is 500 ppm, oxygen is 8% by volume, moisture content is 10% by volume, and the balance is nitrogen. Polyferric chloride is used as commercially available industrial-grade powder particles, with an average particle size of about 0.1mm. Polyferric chloride is heated to 70°C, 90°C and 120°C reaction temperature respectively, and then introduced into the gas-solid reaction tower. The gas temperatures of the air stream are 20°C, 40°C, 55°C and 70°C respectively, and the gas-solid contact time in the reaction tower is about 4-6s. The mass ratio of nitrogen oxides to polyferri...

Embodiment 2

[0020] Example 2: Using polyferric chloride as the reactant, commercially available industrial-grade powdered particles with an average particle size of about 0.1 mm, polyaluminum ferric chloride was heated to 80 ° C, 120 ° C and 150 ° C reaction temperature and then introduced For the gas-solid reaction tower, the gas temperatures of the gas entering the tower are 90°C and 120°C respectively, and other conditions are the same as in Example 1. The experimental results are shown in Table 2.

[0021] Table 2

[0022]

Embodiment 3

[0023] Example 3: Polyferric chloride is introduced into the gas-solid reaction tower at normal temperature, the gas temperatures in the tower are respectively 80°C, 95°C and 120°C, and the mass ratio of nitrogen oxides to polyferric chloride is about 1:15. Other conditions are with embodiment 1. The experimental results are shown in Table 3.

[0024] table 3

[0025]

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Abstract

The invention provides a method for removing nitrogen oxide in airflow and belongs to the technical fields of atmosphere pollution control and environment protection. The treatment process in the method includes the steps that treated gas is introduced into a gas-solid reaction tower, meanwhile polyferric chloride or polyaluminum chloride solid particles are introduced into the gas-solid reaction tower, at a certain temperature, nitrogen oxide in gas and polyferric chloride or polyaluminum chloride have a gas and solid chemical reaction in the gas-solid reaction tower so that the nitrogen oxide can be absorbed and removed, and the aim of purifying the gas is achieved. The invention further provides a special device which has the advantages that investment cost and operation cost are low, use is safe, by-products can be recycled, operation is easy, treatment efficiency is high, and the treatment amount is large.

Description

technical field [0001] The invention relates to a method for removing nitrogen oxides in air flow, and belongs to the technical field of air pollution control and related environmental protection. Background technique [0002] Nitrogen oxides (NOx) produced by human activities x ) mainly includes NO and NO 2 , of which more than 90% are produced by fuel combustion, followed by industrial processes such as nitric acid production, chemical and pharmaceutical nitration reactions, metal surface and semiconductor processing. NO X It is toxic to humans, and a large amount of nitrogen oxide emissions is also one of the main causes of atmospheric photochemical smog and acid rain. Statistical data in the Bulletin on the State of the Environment in China shows that the contribution of nitrogen oxides in acid rain in my country's cities is increasing, and the nature of acid rain pollution in some places has begun to change from sulfuric acid to nitrate ions (Ministry of Environmenta...

Claims

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Application Information

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IPC IPC(8): B01D53/81B01D53/56
CPCB01D53/81B01D53/565B01D2257/404B01D2258/0283
Inventor 黄立维
Owner 黄立维
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