Method for enhancing wet complexing desulfurization and denitrification by modified activated carbon

A technology of desulfurization and denitrification and activated carbon, which is applied in the direction of separation methods, chemical instruments and methods, air quality improvement, etc., can solve the problems of failure to apply, increase the operating cost of iron filings, etc., achieve enhanced desulfurization and denitrification capabilities, and improve desulfurization and denitrification efficiency Effect

Pending Publication Date: 2019-05-31
BEIJING SPC ENVIRONMENT PROTECTION TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Ma Lefan et al. (Journal of Environmental Science, 2008, 28(7): 1360-1364.) studied the continuous reduction and regeneration of iron filings to absorb saturated liquid. The consumption of iron filings will increase the operating cost of the process.
Long Xiangli et al. (Separation and Purification Technology, 74(1):1-6.) used activated carbon to regenerate Fe(II)-EDTA in a fixed-bed reactor, and obtained a high reduction and regeneration effect, but it has not been applied to Use when the amount of flue gas treatment is large

Method used

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  • Method for enhancing wet complexing desulfurization and denitrification by modified activated carbon
  • Method for enhancing wet complexing desulfurization and denitrification by modified activated carbon
  • Method for enhancing wet complexing desulfurization and denitrification by modified activated carbon

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preparation example Construction

[0036] Step 1 (preparation of modified activated carbon)

[0037] The carbon-containing raw materials are mechanically crushed and screened, and the carbon-containing raw materials with a particle size of 30-500 μm are selected, and then carbonized at 200-850 °C for 0.3-8 hours, and then physically activated at 600-950 °C for 0.4 ~24 hours to obtain an activated carbon material; wherein, the carbon-containing raw material is selected from one or more of lignite, bituminous coal and semi-coal;

[0038] The activated carbon material is subjected to modification treatment, and the modification treatment is selected from one or more of alkali treatment, metal loading and metal oxide loading to obtain modified activated carbon.

[0039] In a further embodiment of the present invention, the particle size of the modified activated carbon is 30-500 μm, and the BET specific surface area is 150-1000 m 2 / g, the floating rate is 1%-5%, the ignition point is 400-580°C, the isoelectric po...

Embodiment 1

[0054] This embodiment provides a method for enhanced wet complexation desulfurization and denitrification with modified activated carbon, comprising the following steps:

[0055] The carbon-containing raw material lignite is mechanically crushed and sieved, and the carbon-containing raw material with a particle size of 30-500 μm is selected, and then carbonized at 200-700 ° C for 1 hour. The starting temperature of this process is 200 ° C, and the temperature is programmed to 700°C. The programmed temperature rise time is the specified carbonization time; and then the water vapor activation treatment is performed at 700-850°C for 0.75 hours. The initial temperature of this process is 700°C, and the temperature is programmed to rise to 850°C. The temperature program heating time is the specified carbonization time, and the activated carbon material is obtained. The particle size is 30-500 μm, the BET specific surface area is 472m2 / g, the floating rate is 1.5%, the ignition poi...

Embodiment 2

[0063] This embodiment provides a method for enhanced wet complexation desulfurization and denitrification with modified activated carbon, comprising the following steps:

[0064]The carbon-containing raw material lignite is mechanically crushed and screened, and the carbon-containing raw material with a particle size of 30-500 μm is selected, and then carbonized at 700 ° C for 1.5 hours, and then activated with water vapor at 850 ° C for 2 hours to obtain activated carbon materials Add 5mol / L potassium hydroxide solution to the activated carbon material, soak at 45°C for 12 hours; filter after soaking, wash with deionized water until neutral, then dry at 120°C for 4 hours to obtain modified activated carbon; the particle size is 30-500μm, BET specific surface area is 515m2 / g, floating rate is 2.3%, ignition point is 445°C, isoelectric point is 8.3, ash specific gravity is 6.04%, metal loading rate is 0%.

[0065] Dissolve the complexing agent and ferrous salt in deionized wat...

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Abstract

The invention relates to a method for enhancing wet complexing desulfurization and denitrification by modified activated carbon. The method includes the steps: adding sulfite and activated carbon intoferrous ion complexing agent solution, adjusting a pH (potential of hydrogen) value to reach 3.5-7.5 to obtain wet complexing absorption liquid; leading flue gas to be treated into an absorption reaction device, performing contact reaction on the flue gas and the wet complexing absorption liquid, and discharging the flue gas after NOx and SO2 in the flue gas are absorbed and purified. According to the method, the NOx and the SO2 in the flue gas to be treated and the wet complexing absorption liquid are absorbed, catalyzed, oxidized and reduced, and the modified activated carbon serves as a catalyst in the reaction process. According to the method, wet complexing desulfurization and denitrification efficiency of ferrous ion complexing agents can be enhanced, the removal rate of sulfur dioxide is higher than or equal to 98%, the removal rate of nitrogen oxide is 65%-95% before and after the flue gas is purified, flue gas absorption and regeneration of complexing liquid are integrated, the method is simple, catalyst is easily separated and recyclable, and dust collection efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for enhancing wet complexation desulfurization and denitrification with modified activated carbon. Background technique [0002] Coal combustion flue gas is the main source of sulfur dioxide and nitrogen oxides, which has a great impact on the ecological environment. To control SO 2 and nitrogen oxides (NO x ) pollution, prevent and control acid rain hazards, accelerate the development of my country's flue gas desulfurization and denitrification technology and industry, and develop and promote coal-fired flue gas desulfurization and denitrification technologies that reduce emissions, consume less energy, have high efficiency, and occupy less land. Nitrogen oxides are one of the main sources of air pollution, and more than 95% of them are NO, which is insoluble in water. Therefore, in the traditional wet desulfurization device, NO can not be removed at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/60
CPCY02A50/20
Inventor 龚得喜刘少冕昌健吕小玲韩旭东张开元
Owner BEIJING SPC ENVIRONMENT PROTECTION TECH
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