A catalytic oxidation additive for wet flue gas mercury removal and preparation method thereof

A catalytic oxidation and additive technology, applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of prominent Hg0 control, high mercury, and low chlorine content, so as to solve the problem of mercury pollution control, solve the The effect of secondary pollution and improving utilization rate

Active Publication Date: 2016-01-20
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally problems of high mercury content and low chlorine content in coal combustion in my country, which leads to the occurrence of Hg in coal combustion flue gas in China. 0 outstanding control issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Catalytic oxidation additive: H 2 o 2 The contents of , NaCl and metal salts are calculated based on their respective dosing concentrations in the desulfurization slurry, where H 2 o 2 Dosing concentration is 0.05mol / L, NaCl dosing concentration is 0.05mol / L, MnCl 2 The dosing concentration is 0.1mol / L, and the three are mixed evenly.

[0020] The dynamic experiment was carried out in a small packed desulfurization tower with limestone as the desulfurizer, and the density of the limestone slurry was 1150kg / m 3 -1300kg / m 3 , the slurry pH is about 5.6, and the simulated flue gas condition is imported Hg 0 0.3mg / m 3 , SO 2 1000ppm, O 2 3%, CO 2 12%, the rest is N 2 , control the flue gas flow to 1L / min. Add the prepared catalytic oxidation additive directly into the slurry tank, and send it to the absorption tower for reaction after being mixed evenly. The mercury content at the inlet was measured by solution absorption and cold atomic fluorescence, so as to c...

Embodiment 2

[0023] Catalytic oxidation additive: H 2 o 2 The contents of , NaCl and metal salts are calculated based on their respective dosing concentrations in the desulfurization slurry, where H 2 o 2 Dosing concentration is 0.05mol / L, NaCl dosing concentration is 0.1mol / L, Co(NO 3 ) 2 The dosing concentration is 0.1mol / L, and the three are mixed evenly.

[0024] The dynamic experiment was carried out in a small packed desulfurization tower with limestone as the desulfurizer, and the density of the limestone slurry was 1150kg / m 3 -1300kg / m 3 , the slurry pH is about 5.6, and the simulated flue gas condition is imported Hg 0 0.3mg / m 3 , SO 2 1000ppm, O 2 3%, CO 2 12%, the rest is N 2 , control the flue gas flow to 1L / min. Add the prepared catalytic oxidation additive directly into the slurry tank, and send it to the absorption tower for reaction after being mixed evenly. The mercury content at the inlet was measured by solution absorption and cold atomic fluorescence, so as...

Embodiment 3

[0027] Catalytic oxidation additive: H 2 o 2 The contents of , NaCl and metal salts are calculated based on their respective dosing concentrations in the desulfurization slurry, where H 2 o 2 Dosing concentration is 0.05mol / L, NaCl dosing concentration is 0.1mol / L, MnCl 2 Dosing concentration is 0.2mol / L, the three are mixed evenly

[0028] The dynamic experiment was carried out in a small packed desulfurization tower with limestone as the desulfurizer, and the density of the limestone slurry was 1150kg / m 3 -1300kg / m 3 , the slurry pH is about 5.6, and the simulated flue gas condition is imported Hg 0 0.3mg / m 3 , SO 2 1000ppm, O 2 3%, CO 2 12%, the rest is N 2 , control the flue gas flow to 1L / min. Add the prepared catalytic oxidation additive directly into the slurry tank, and send it to the absorption tower for reaction after being mixed evenly. The mercury content at the inlet was measured by solution absorption and cold atomic fluorescence, so as to calculate t...

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PUM

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Abstract

The invention discloses a catalytic oxidation additive for wet flue gas demercuration, which is composed of H2O2, NaCl and metal salt, wherein the molar ratio of H2O2 to NaCl is 0.05~1.0:0.05~0.3; the ratio of metal salt to H2O2 The molar ratio is 0.5~4. The invention also discloses a preparation method of the catalytic oxidation additive. The catalytic oxidation additive can effectively convert elemental mercury in the flue gas into oxidized mercury, thereby realizing the migration of mercury from the gas phase to the liquid phase and reducing the concentration of mercury in the flue gas. The operation of the wet flue gas demercuration is simpler, and there is no secondary pollution, which has good environmental benefits.

Description

technical field [0001] The invention relates to a catalytic oxidation additive, in particular to a catalytic oxidation additive for wet flue gas demercuration, and also relates to a preparation method of the catalytic oxidation additive. Background technique [0002] As one of the most volatile heavy metal elements in coal combustion, mercury has attracted extensive attention from scholars at home and abroad in recent years. It has the characteristics of high volatility, easy accumulation in organisms, and long residence time in the atmosphere. Mercury generally invades the human body through the respiratory tract, skin tissue, and digestive tract, causing movement disorders, language barriers, and even kidney failure in severe cases, which brings great health risks to people. The influence of the environment cannot be ignored. Therefore, controlling the emission of mercury is an urgent problem to be solved. [0003] Mercury pollution mainly comes from the combustion of fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01D53/64
Inventor 唐念盘思伟李丽胡将军陈思维
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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