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A green, low-cost flue gas mercury removal method

A low-cost, flue gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problem of high preparation cost, achieve the effect of simple preparation process, high-efficiency catalytic oxidation, and solve environmental pollution

Active Publication Date: 2021-05-18
杭州绿元新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned catalysts all use relatively pure chemical reagents as raw materials, and the preparation cost is relatively high. How to develop low-cost catalysts that can ensure high catalytic oxidation efficiency has become the focus of research.

Method used

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  • A green, low-cost flue gas mercury removal method
  • A green, low-cost flue gas mercury removal method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Red mud (Bayer process red mud, Al 2 o 3 The mass content is 10wt%, Fe 2 o 3 The mass content is 25wt%) into 4 times the volume of water, continue to stir and filter, collect the filtrate, recover the alkali in the red mud, and record the filtrate as s1; add 0.5mol / L hydrochloric acid to the obtained red mud, add acid measuring solution Solid ratio L / S=8mL / g, stir for 2 hours to dissolve part of the metal Al and Fe in the red mud, and the obtained suspension is recorded as s2;

[0027] (2) Slowly add the filtrate s1 to the suspension s2 under continuous stirring, the added amount of liquid-solid ratio L / S=4mL / g, continue to add water 20 times the volume of the filtrate s1, stir for 2 hours, and stand at room temperature for 8 hours, Make the dissolved part of Al and Fe form hydroxyl compounds, and the resulting suspension is denoted as s3;

[0028] (3) Add the dry montmorillonite to the suspension s3 in an amount equal to 1 times the mass of the solid in the sus...

Embodiment 2

[0031] The prepared mercury removal catalyst Cat1 (0.3g) was packed in a fixed bed reactor, and the simulated flue gas was passed through. The composition of the simulated flue gas was 4% O 2 , 10% CO 2 , 400 ppm SO 2 , 8%H 2O, 10 ppm HCl, 200 ppm NO, and N 2 Balance gas; using CO 2 Hg as carrier 0 (50μg / m 3 ) into the reactor with a flow rate of 1L / min and a space velocity of 10000h -1 . The mercury oxidation rate was calculated by measuring the mercury content at the outlet of the reactor.

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Abstract

The invention relates to a green and low-cost flue gas mercury removal method, which belongs to the fields of waste comprehensive utilization and gas purification. The flue gas demercuration method of the present invention is to pass the flue gas into the bed of the mercury removal catalyst prepared by utilizing natural ore and waste residue, so that the Hg in the flue gas 0 Catalytic oxidation to Hg 2+ , to achieve the removal of mercury. The catalyst uses low-cost natural ore montmorillonite and industrial waste red mud and sludge as raw materials, and effectively utilizes metals such as Fe, Al, and Ti contained in the red mud, alkalis, and organic matter in the sludge, and has porosity High, large specific surface area, stable metal solid loading advantages, its specific surface area can reach 178m 2 / g. The flue gas mercury removal method of the present invention can realize Hg at a lower temperature 0 The high-efficiency oxidation has high industrial and environmental value.

Description

technical field [0001] The invention relates to a green and low-cost flue gas mercury removal method, which belongs to the fields of waste comprehensive utilization and gas purification. Background technique [0002] As the most important energy source, coal combustion accounts for more than 70% of my country's energy structure, and my country's annual coal consumption accounts for 31% of the world's total raw coal consumption. However, the average mercury content in coal combustion in my country is 0.22mg / kg, far exceeding the world average mercury content of 0.13mg / kg. The amount of mercury emitted to the atmosphere by coal-fired power stations in my country is 500-700 tons every year, accounting for about 30% of the world's total emissions. Therefore, how to effectively control mercury in coal-fired flue gas has become an urgent problem to be solved. [0003] Catalytic oxidation mercury removal technology is to remove Hg from flue gas 0 Oxidized to easily removed Hg 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/64B01J23/745B01J35/10
CPCB01D53/8665B01D2257/602B01D2258/0283B01J23/002B01J23/745B01J35/1014B01J35/1019B01J35/1038B01J2523/00B01J2523/31B01J2523/47B01J2523/842
Inventor 徐书敏
Owner 杭州绿元新材料有限公司
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