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Modified activated carbon demercuration adsorbent and preparation method thereof

A technology of activated carbon and adsorbent, which is applied in the field of mercury removal from coal-fired flue gas. It can solve the problems of high cost, poor economy, and low efficiency of activated carbon, improve the apparent structure and pore structure, reduce operating costs, and have strong environmental adaptability. Effect

Inactive Publication Date: 2013-10-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high cost of activated carbon, direct use of original activated carbon as an adsorbent for mercury removal has low efficiency and poor economy

Method used

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  • Modified activated carbon demercuration adsorbent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The crushed and dried coal-based activated carbon is sieved, and the powder of about 200 meshes is selected for use; 2g of analytically pure ammonium chloride NH is weighed 4 Cl is placed in a beaker, and 200ml of deionized water is added to the beaker, stirred evenly with a magnetic stirrer, and ammonium chloride NH with a mass fraction of 1% is prepared. 4 Cl solution; weigh 10g of 200 mesh sieved activated carbon powder, put it into the prepared 1% ammonium chloride NH 4 In the Cl solution, use a magnetic stirrer to stir for 12 hours; filter the waste liquid, dry the filtered solid matter in a 45°C oven, and grind it to powder, that is, 1% ammonium chloride NH 4 Cl solution modified coal-based activated carbon adsorbent for mercury removal.

Embodiment 2

[0019] Crushed and dried cylindrical coal-based activated carbon, sieved, and selected powder of about 200 meshes for use; weighed 2g of analytically pure ammonium bromide NH 4 Br was placed in a beaker, and 200ml of deionized water was added to the beaker, stirred evenly with a magnetic stirrer, and ammonium bromide NH with a mass fraction of 1% was prepared. 4 Br solution; weigh 10g of 200 mesh sieved activated carbon powder, put into the prepared 1% ammonium bromide NH 4 In the Br solution, use a magnetic stirrer to stir for 12 hours; filter off the waste liquid, dry the filtered solid matter in an oven at 45°C, and grind it to powder to obtain 1% ammonium bromide NH 4 Br solution modified coal-based activated carbon adsorbent for mercury removal.

Embodiment 3

[0021] Select the 1%NH prepared in Example 1 for use 4 Cl-modified activated carbon adsorbent for mercury removal, and its adsorption performance was verified on a fixed-bed adsorption performance test device. The fixed bed test device consists of a simulated flue gas generation system, a fixed bed reactor, a mercury detector, etc., N 2 Atmosphere, the total gas flow rate is 2L / min. Mercury vapor is generated by a mercury permeation tube (manufactured by VICI Metronics, USA) placed in a U-shaped high borosilicate glass tube. The generated mercury vapor is carried out by using high-purity nitrogen as a carrier gas, and the flow rate of the carrier gas is 150ml / min. The concentration of mercury in the flue gas was determined using a VM-3000 online mercury analyzer (manufactured by Mercury Instrument, Germany). The mercury vapor concentration at the inlet of the fixed bed was 35.5 / m during the test 3 , the amount of original activated carbon and modified activated carbon is 50...

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Abstract

The invention relates to a modified activated carbon demercuration adsorbent and a preparation method thereof. The modified activated carbon demercuration adsorbent is prepared by impregnating and modifying original activated carbon with a salt solution of NH4Cl, NH4Br or the like and drying. The preparation method comprises the following steps: crushing original activated carbon to less than 50 meshes; immersing the crushed activated carbon in a NH4Cl or NH4Br solution, and continuously stirring for 12-15 hours; filtering out waste liquor, and drying at 45-50 DEG C for 8-10 hours to obtain a solid matter which is the modified activated carbon demercuration adsorbent. Compared with the original activated carbon, the modified activated carbon demercuration adsorbent has the advantages of big mercury adsorption capacity, high adsorption rate and the like.

Description

technical field [0001] The invention relates to the field of mercury removal from coal-burning flue gas, in particular to a method for preparing a flue gas mercury removal adsorbent by impregnating modified activated carbon with a solution. Background technique [0002] Mercury is a global circulating element, a toxic substance that can permanently accumulate in organisms and food chains, and can cause neurotoxicity and deep tissue lesions in humans. In addition, methylmercury can also cause damage to chromosomes. thereby affecting genetics. [0003] Under the combustion conditions of coal-fired boilers (1100-1300°C for pulverized coal furnaces, 850-950°C for fluidized bed boilers), most of the mercury in coal is in the form of gaseous element mercury Hg 0 The form of (g) is released. After entering the tail flue, as the temperature of the flue gas gradually decreases, the Hg 0 (g) Homogeneously oxidize the gas phase components in the flue gas to form gaseous Hg 2+ (g) C...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/32B01D53/02
Inventor 段钰锋冒咏秋朱纯桑圣欢王卉
Owner SOUTHEAST UNIV
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