Preparation method of active carbon loaded MnO2, and device and process for denitrating industrial flue gas

A technology of industrial flue gas and activated carbon, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of complex denitrification process, high processing cost, and large energy consumption, and achieve simple process flow, high conversion efficiency, The effect of high degree of automation

Inactive Publication Date: 2017-05-31
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] In order to overcome the shortcomings of the existing denitrification process, such as complex, high energy consumption, high processing cost, need for molding, easy to produce secondary pollution, etc., the present invention provides an activated carbon loaded MnO 2 The preparation method, equipment and process of industrial flue gas denitrification, the process can be briefly described as: through the reaction of potassium permanganate and manganese nitrate on the pores of activated carbon, impregnation and precipitation occur, and MnO is uniformly loaded in activated carbon 2 , load MnO 2 The activated carbon in the flue gas adsorbs and concentrates the NO in the pores, and the O in the flue gas 2 High-efficiency catalytic oxidation reaction occurs to generate NO 2 ; NO in reaction flue gas: NO 2 When the ratio is quickly close to 1:1, the rapid denitrification of industrial flue gas can be realized through lye purification

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  • Preparation method of active carbon loaded MnO2, and device and process for denitrating industrial flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Activated carbon loaded MnO 2 preparation of

[0046] Grind 5g of wood activated carbon powder, the particle size is 2 / g, vacuum-dried at 110°C for 12 hours, and the moisture content of the dried material was 800 r / min. After the potassium permanganate solution was added dropwise, the solid-liquid mixture was filtered, and the obtained solid was vacuum-dried at 120°C for 4 hours, and then dried under N 2 Heating at 200°C for 2 hours under the atmosphere can prepare 2.3% MnO 2 activated carbon (MLAC). Take 1.1g MLAC and put it into a quartz reaction tube, at room temperature, feed 1.1L / min, 1000ppm NO, 20%vol O 2 , N 2 Balanced gas, using a flue gas analyzer to monitor NO and NO in the tail gas 2 The concentration of the two, until the concentration of the two tends to be stable, the exhaust gas is passed into the NaOH aqueous solution, and the removal rate of nitrogen oxides can reach >90%.

Embodiment 2

[0047] Example 2: Activated carbon loaded MnO 2 preparation of

[0048] Grind 10g of wood activated carbon powder, the particle size is 2 / g, vacuum-dried at 110°C for 12 hours, and the moisture content of the dried material was <0.1%. After drying, put the activated carbon powder into the round bottom flask, then add 75mL of 0.010mol / L manganese nitrate solution, stir evenly, and soak for 30min. Then add 50 mL dropwise at a rate of 1 mL / min

[0049] 0.010mol / L potassium permanganate solution, supplemented by vigorous magnetic stirring, with a rotation speed of >800r / min. After the potassium permanganate solution was added dropwise, the solid-liquid mixture was filtered, and the obtained solid was vacuum-dried at 120°C for 4 hours, and then dried under N 2 Heating at 200°C for 2 hours under the atmosphere can prepare 1% MnO 2 activated carbon (MLAC). Take 1.1g MLAC and put it into a quartz reaction tube, at room temperature, feed 1.1L / min, 1000ppm NO, 20%vol O 2 , N 2 B...

Embodiment 3

[0050] Example 3: Activated carbon loaded MnO 2 preparation of

[0051] Grind 5g of wood activated carbon powder, the particle size is 2 / g, vacuum-dried at 110°C for 12 hours, and the moisture content of the dried material was 800 r / min. After the potassium permanganate solution was added dropwise, the solid-liquid mixture was filtered, and the obtained solid was vacuum-dried at 120°C for 4 hours, and then dried under N 2 Heating at 200°C for 2 hours under the atmosphere can prepare 10% MnO 2 Activated carbon MLAC. Take 1.1g MLAC and put it into a quartz reaction tube, at room temperature, feed 1.1L / min, 1000ppm NO, 20%vol O 2 , N 2 Balanced gas, using a flue gas analyzer to monitor NO and NO in the tail gas 2 The concentration of the two, until the concentration of the two tends to be stable, the exhaust gas is passed into the NaOH aqueous solution, and the removal rate of nitrogen oxides can reach >90%.

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Abstract

The invention discloses a preparation method of active carbon loaded MnO2, and a device and a process for denitrating industrial flue gas. The specific preparation method of the active carbon loaded MnO2 comprises the following steps: drying active carbon in vacuum; impregnating the dried active carbon in a manganous dinitrate solution under normal temperature and carrying out ultrasonic oscillation; dropwise adding a potassium permanganate solution into an impregnated solid-liquid mixture and stirring intensely; filtering the stirred mixture in vacuum; carrying out forced-air drying on the filtered solid phase; and roasting the solid obtained by forced-air drying in inert gas to obtain modified active carbon powder. The invention also discloses the device and the process of denitrating industrial flue gas by using the active carbon loaded MnO2 and provides a novel scheme for further denitrating the industrial flue gas desulfurized by a dry method or a semidry method. The process is simple; the automation degree is high; the flue gas does not need to be reheated; the active carbon loaded MnO2 can be recycled; the conversion efficiency is high; the cost is low; the denitration process is clean and tidy; the secondary pollution is not generated.

Description

technical field [0001] The invention relates to the field of industrial waste gas treatment, in particular to an activated carbon loaded MnO 2 The preparation method, equipment and process of industrial flue gas denitrification. Background technique [0002] Nitrogen oxides are a class of important air pollutants, NO and NO 2 accounted for NO in the atmosphere x The vast majority of the pollution mainly comes from exhaust emissions from stationary sources such as power plant boilers, industrial furnaces, and civilian stoves, and mobile sources such as motor vehicles. NO x It is easy to cause acute toxicity, animal respiratory diseases, damage to plant leaves, and environmental problems such as acid rain and photochemical smog. As the emission of nitrogen oxides is increasing year by year, at present, my country has listed nitrogen oxides as one of the important emission reduction indicators of air pollutants. Therefore, it is of great significance to study the flue gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/78B01D53/56B01J23/34
CPCB01D53/75B01D53/02B01D53/56B01D53/78B01D53/8628B01D2255/2073B01D2255/702B01D2258/0283B01J23/34
Inventor 余广炜尤甫天汪印李杰邢贞娇谢胜禹
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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