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Preparation method of a porous fly ash adsorbent and application of the adsorbent

A technology of adsorbent and fly ash, which is applied in the field of preparation of porous fly ash adsorbent for removing Hg0 from coal-fired flue gas, can solve the problems of high cost, complex process, poor cycle stability, etc., and achieve low price and easy preparation The effect of simple process and easy removal

Active Publication Date: 2019-10-11
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method of a porous fly ash adsorbent and the application of the adsorbent to solve the problem of removing Hg from coal-fired flue gas in the existing preparation. 0 The process of adsorbent is complicated, the cost is high, the prepared adsorbent has low removal precision, poor cycle stability and other problems

Method used

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  • Preparation method of a porous fly ash adsorbent and application of the adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] Weigh 100g sieved fly ash with particle size of 0.1-0.15mm, mix with 40g CaO powder, add 40ml

[0022] Deionized water is configured as a mixed solution and placed in a conical flask, put the conical flask into a water bath and stir at a constant speed at 50°C for 20 minutes, then filter off the excess liquid, and place the obtained slurry sample in an air drying oven Dry at 60°C for 10 hours to obtain powdered fly ash aggregate, then mix the fly ash aggregate powder with sodium bentonite, sodium carboxymethylcellulose and powdered corn cob in a mass ratio of 12:4:2:1, Add 30ml of deionized water and extrude to make cylindrical particles with a diameter of 2mm and a height of 3mm, and put them in an air drying oven at 50 and 90°C for 5 hours, and finally raise them from room temperature to 700°C in a muffle furnace Keep the temperature at constant temperature for 5 hours, then naturally cool to room temperature to prepare the porous fly ash adsorbent Ⅰ. Hg removal is c...

Embodiment approach 2

[0024] Weigh 80g sieved fly ash with particle size of 0.1-0.15mm, mix with 20g CaO powder, add 40ml

[0025] Deionized water is prepared as a mixed solution and placed in an Erlenmeyer flask. Put the Erlenmeyer flask into a water bath and stir at a constant speed for 25 minutes at 47°C. After filtering off the excess liquid, place the obtained slurry sample in an air drying oven Dry at 68°C for 8 hours to obtain powdery fly ash aggregate, then mix the fly ash aggregate powder with sodium bentonite, sodium carboxymethylcellulose and powdered corn cob in a mass ratio of 12:5:1:2, Add 30ml of deionized water and extrude to make cylindrical particles with a diameter of 2mm and a height of 2mm, and put them in an air drying oven at 50 and 90°C for 5 hours, and finally raise them from room temperature to 760°C in a muffle furnace Keep the temperature at constant temperature for 3 hours, and cool naturally to room temperature to prepare the porous fly ash adsorbent II. Hg removal is...

Embodiment approach 3

[0027] Weigh 80g sieved fly ash with particle size of 0.1-0.15mm, mix with 20g CaO powder, add 40ml

[0028] Deionized water is configured as a mixed solution and placed in a conical flask, put the conical flask into a water bath and stir at a constant speed at 50°C for 20 minutes, then filter off the excess liquid, and place the obtained slurry sample in an air drying oven Dry at 60°C for 10 hours to obtain powdered fly ash aggregate, then mix the fly ash aggregate powder with sodium bentonite, sodium carboxymethylcellulose and powdered corn cob in a mass ratio of 12:5:1:3, Add 30ml of deionized water and extrude to make cylindrical particles with a diameter of 3mm and a height of 3mm, and put them in an air drying oven at 50 and 90°C for 5 hours, and finally raise them from room temperature to 730°C in a muffle furnace Keep the temperature at constant temperature for 3 hours, and cool naturally to room temperature to prepare the porous fly ash adsorbent III. Hg removal is c...

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Abstract

The invention provides a preparation method of a porous fly ash adsorbent and application of the adsorbent. The method takes metal oxide Fe2O3 and MgO in coal combustion fly ash which is used as an adsorbent matrix and effectively components for oxidizing and adsorbing HgO; while fly ash aggregate is prepared, CaO is changed into Ca(OH)2 and the porosity of the fly ash aggregate is also increased;the application is that the adsorbent is used for removing the HgO in coal combustion flue gas in a high-precision manner in a temperature range of 80 to 300 DEG C until the content of the HgO is 4mug / m<3>. The adsorbent prepared by the method has a relatively good pore structure and the specific surface area is greater than 180m<2> / g; the fly ash, corncobs, sodium bentonite and sodium carboxymethyl cellulose are cheap and easy to obtain; a preparation technology is simple and feasible; the adsorbent has relatively good mechanical strength which is greater than 60N / mm<2>, and can be widely used for removing the HgO in various coal combustion flue gases.

Description

technical field [0001] The invention relates to a preparation method of a porous fly ash adsorbent and the application of the adsorbent, especially a method for removing Hg from coal-fired flue gas 0 Preparation method of porous fly ash adsorbent and application of the adsorbent. Background technique [0002] Coal is an important fossil energy, and its clean transformation is crucial to sustainable development. Coal combustion for power generation is the main method of coal utilization at present. The "Emission Standard of Air Pollutants for Thermal Power Plants" GB13223-2011 clearly states that from From January 1, 2015, the emission limit of mercury and its compound pollutants in the flue gas of coal-fired boilers is 30 μg / m 3 On August 16, 2017, the global mercury pollution control convention "Minamata Convention on Mercury", which China is a signatory to, came into effect, which further strengthened the emphasis on mercury emissions. Therefore, the problem of mercury po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01D53/02B01J20/30
Inventor 樊保国郑仙荣柳成亮郝海俊耿瑞明乔晓磊
Owner TAIYUAN UNIV OF TECH