Electrochemical regeneration method of flue gas demercury adsorbing material

An adsorption material and electrochemical technology, applied in chemical instruments and methods, separation methods, filter regeneration, etc., can solve the problems of difficult regeneration of modified materials, improve adsorption specificity and adsorption capacity, convenient operation, and small damage. Effect

Inactive Publication Date: 2005-01-05
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of difficult regeneration of modified materials that adsorb mercury in flue gas, and provide an electrochemical regeneration method for mercury removal adsorption materials in flue ga

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The specific surface area is 860m 2 / g of activated carbon is immersed in a copper chloride solution with a concentration of 2mol / L, dried, and repeated 3 times. Put it into a tube furnace and raise the temperature to 250°C at 10°C / min, and react at constant temperature for 2 hours to prepare activated carbon infiltrated with 5wt.% copper chloride. Use modified activated carbon material to adsorb mercury-containing flue gas, the flue gas flow rate is 35m / min, Hg 0 The concentration is 10μg / m 3 , adsorption for 50 hours. The residual concentration of mercury in the flue gas after adsorption is 0.5μg / m 3 . Then, the activated carbon adsorbed mercury was subjected to 5wt.% concentration of KI, 20wt.% concentration of I 2 , 5wt.% concentration of HCl solution treatment, and pass through the solution of 1.5wt.% O 3 , so that Hg forms complex ions. Under the action of 10V DC, the current density is controlled at 0.05A / cm 2 , so that Hg complex ions move to the cathode...

Embodiment 2

[0023] Set the specific surface area to 30m 2 / g of zeolite is placed in a tube furnace, the temperature is raised to 100°C at a rate of 10°C / min, and the concentration of iodine vapor is 2g / m3 3 Nitrogen, flow rate 1.5m / min, reacted for 3 hours, prepared zeolite infiltrated with 1wt.% iodine. Put the modified zeolite into the adsorption bed, and feed it with a mercury concentration of 500μg / m 3 The flue gas flow rate is 3m / min, and the mercury adsorption amount of the material after 10 hours of adsorption is 0.5mg / g. The residual concentration of mercury in the flue gas is 2.85μg / m 3 . Then the zeolite with adsorbed mercury was subjected to 10wt.% concentration of H 2 o 2 , 10wt.% KCl solution and 1wt.% citrate solution, and add 0.5% FeSO 4 , so that Hg forms complex ions. Under the action of 3V DC, the current density is controlled at 0.005A / cm 2 , so that Hg complex ions move to the cathode, the oxidized mercury is reduced to elemental mercury at the cathode, and el...

Embodiment 3

[0025] The specific surface area is 1580m 2 / g of activated carbon fiber was put into a tube furnace and heated to 300°C, and reacted with sulfur steam for 2 hours to prepare activated carbon fiber infiltrated with 10wt.% sulfur. Modified activated carbon fibers adsorb mercury-containing flue gas, Hg 0 Concentration 28μg / m 3 , the flue gas flow rate is 3.6m / min, the activated carbon fiber is taken out after 10 hours, the mercury content in the adsorption material is measured to be 2.0mg / g, and the residual mercury concentration in the flue gas after adsorption is 0.45μg / m 3 . The modified material with adsorbed mercury was treated with 20wt.% concentration of I 2 And 10wt.% concentration of HCl solution treatment, and pass through the solution of 2.2% Cl 2 , so that Hg forms complex ions. Under the action of 25V DC, the current density is controlled at 0.1A / cm 2 , so that Hg complex ions move to the cathode, and the oxidized mercury is reduced to elemental mercury at the...

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Abstract

An electrochemical process for regenerating the used adsorbent generated by demercurating fume includes such steps as treating it by oxidizing-reducing agent and complexing agent to form complexed Hg ions, applying an electric field to reduce the oxidized Hg to Hg, and modifying its surface by penetrating S, P and N.

Description

technical field [0001] The invention relates to an electrochemical regeneration method of a flue gas mercury removal adsorption material, which is used for flue gas treatment and resource recovery, and belongs to the technical field of environmental protection and energy saving. Background technique [0002] Mercury emissions from coal-fired power plants are generally considered to be the largest source of mercury pollution. Research on mercury emission control technology in coal-fired flue gas mainly focuses on two aspects: [0003] (1) Elemental mercury (Hg 0 ) is oxidized to divalent mercury (Hg 2+ ), combined with existing wet desulfurization and dust removal equipment. SO in flue gas 2 , NOx and other substances such as mercury, arsenic and selenium, Hg 0 oxidized to Hg 2+ The difficulty is great and the cost is high. Therefore, it is more difficult to popularize this technology in our country. [0004] (2) Adsorption and removal of mercury. [0005] Commonly u...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01J20/20B01J20/34
Inventor 申哲民梅志坚王文华
Owner SHANGHAI JIAO TONG UNIV
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