Ferric-chlorine-modified active carbon adsorbent for removing mercury from smoke

A technology of activated carbon adsorption and activated carbon, which is applied in other chemical processes, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of high operating cost, low mercury adsorption efficiency and limited adsorption capacity of activated carbon mercury removal technology by jetting activated carbon. The effect of excellent mercury removal performance, relatively low cost and simple preparation method

Active Publication Date: 2013-05-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, spraying activated carbon mercury removal technology is currently the most effective flue gas mercury removal technology, but the original unmodified activated carbon has low mercury adsorption efficiency and limited adsorption capacity, resulting in high operating costs for sprayed activated carbon mercury removal technology, which limits this technology. Promotion in coal-fired power stations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Crush and dry coal-based activated carbon, sieve, and select a powder with a particle size of about 50 mesh for use; use a graduated cylinder to measure 200ml of deionized water and put it in a beaker for later use; use a standard pipette (1000ul-5000ul) to measure 30ml twice concentrated HClO 3 (70%-72%v / v) solution, slowly add to the above beaker, stir evenly, and make 15%v / v HClO 3 solution; then weigh 2g Fe(NO 3 ) 3 Solid samples were dissolved in 15% v / v HClO as prepared 3 solution, use a magnetic stirrer to fully stir evenly, and prepare 1%w / wFe(NO 3 ) 3 -15%v / v HClO 3 solution; take by weighing 10g200 mesh sieved activated carbon powder, put into prepared 1%w / wFe(NO 3 ) 3 -15%v / v HClO 3 solution, and use a magnetic stirrer to stir for 12h; filter off the clear liquid, put the filtered solid substance in a 45°C oven for drying, and grind it to powder, that is, 1%w / w Fe(NO 3 ) 3 -15%v / v HClO 3 Modified coal-based activated carbon adsorbent for mercury re...

Embodiment 2

[0019] Select 1%w / wFe(NO) prepared in Example 1 for use 3 ) 3 -15%v / v HClO 3 Modified activated carbon adsorbent for mercury removal, verified Fe(NO 3 ) 3 -HClO 3 Effect of mixed solution modifiers. 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 was generated by a mercury permeation tube (VICI Metronics, USA) placed in a U-shaped borosilicate glass tube, and was carried out using high-purity nitrogen as a carrier gas with a flow rate of 150ml / min. The mercury concentration in the flue gas was determined using a VM-3000 online mercury analyzer (Mercury Instrument Company, Germany). The concentration of mercury vapor at the inlet of the fixed bed was 35.9 μg / m during the test 3 , the amount of original activated carbon and iron chloride modified activated carbon is 50mg. The test results are as follows: when the original activate...

Embodiment 3

[0021] Crush and dry coal-based activated carbon, sieve, and select a powder with a particle size of about 50 mesh for use; use a graduated cylinder to measure 200ml of deionized water and put it in a beaker for use; use a standard pipette (1000ul-5000ul) to measure 2ml twice concentrated HClO 3 (70%-72%v / v) solution, slowly add to the above beaker, stir evenly, and make 1%v / v HClO 3 solution; then weigh 2g Fe(NO 3 ) 3 Solid samples were dissolved in prepared 1% v / v HClO 3 solution, use a magnetic stirrer to fully stir evenly, and prepare 1%w / wFe(NO 3 ) 3 -1%v / v HClO 3 solution; take by weighing 10g200 mesh sieved activated carbon powder, put into prepared 1%w / wFe(NO 3 ) 3 -1%v / v HClO 3 solution, and stirred with a magnetic stirrer for 12 hours; the clear liquid was filtered off, and the filtered solid matter was dried in an oven at 45°C, and ground to powder to obtain 1%w / wFe(NO 3 ) 3 -1%v / v HClO 3 Modified coal-based activated carbon adsorbent for mercury removal....

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Abstract

The invention discloses a ferric-chlorine-modified active carbon adsorbent for removing mercury from smoke. The modified active carbon adsorbent is obtained through the following steps of: preparing ferric nitrate-chloric acid mixed solution firstly, impregnating modified active carbon by using the mixed solution, then filtering out supernatant and drying to obtain the modified active carbon adsorbent. The invention aims at a jetting mercury removal technique of boiler smoke in a coal-fired power plant to provide a specialized efficient mercury removing adsorbent; the adsorbent is simple in preparation and low in cost; compared with an original active carbon, the adsorbent has the advantages of stronger mercury adsorption capability, larger adsorption amount and the like; and the adsorbent can effectively adsorb mercury from the smoke.

Description

technical field [0001] The invention belongs to the field of mercury removal from flue gas, and in particular relates to an activated carbon adsorbent for mercury removal from flue gas. Background technique [0002] Heavy metal mercury is a very harmful and highly toxic pollutant to the ecological environment and human health. It mainly comes from three aspects: natural emissions, man-made emissions, and secondary releases. Due to the relatively close and continuous interaction between the atmosphere, soil and water, once mercury is introduced into the environment, it is difficult to eliminate. Mercury entering the atmosphere will circulate and migrate around the world, and have long-term cumulative effects. [0003] Coal-fired power stations are currently the largest single source of mercury emissions. According to the latest air pollutant emission standard for thermal power plants (GB13223-2011) promulgated by the Ministry of Environmental Protection of my country: From J...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
Inventor 段钰锋佘敏冒咏秋朱纯周强桑圣欢
Owner SOUTHEAST UNIV
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