Flue gas mercury oxidation catalyst and application thereof

A mercury oxidation and catalyst technology, which is applied in the field of flue gas purification, can solve the problems that the oxidation efficiency depends on the concentration of hydrogen chloride, the concentration of HCl is low, and the oxidation efficiency is low, so as to avoid land occupation and pollution problems, less investment and simple preparation process.

Active Publication Date: 2017-05-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial selective catalytic reduction (SCR) catalysts for Hg 0 The oxidation of mercury has a catalytic effect, but the existing commercial SCR catalysts are generally vanadium-based catalysts, which are highly toxic, and the production and use processes are likely to cause harm to the environment, and the oxidation efficiency of commercial SCR catalysts for elemental mercury is greatly dependent on the amount of mercury in the flue gas. concentration of hydrogen chloride
For example, the concentration of HCl in low-rank coal flue gas is low, and the oxidation efficiency of vanadium-based SCR catalysts for elemental mercury is lower than 30%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select a small amount of copper smelting water quenching slag without pretreatment, dry it and grind it to a 60-100 mesh sieve, weigh 0.3 g of the ground copper smelting water quenching slag, and place it in a 10 mm cylindrical quartz glass fixed bed reactor. The tube furnace is used to control the reaction temperature, and the flue gas composition and concentration are simulated by the mass flow meter. The flue gas composition is 20 ppm HCl, 75µg / m 3 Hg 0 . The simulated flue gas flow rate is 0.15 m / s, and the concentration of elemental mercury at the inlet and outlet of the reactor is monitored by a mercury meter. When reacting at 250 °C, the oxidation rate of elemental mercury is as high as 90%.

Embodiment 2

[0030] Select a small amount of water-quenched copper smelting slag soaked in 10% dilute sulfuric acid for 1.5h, dry it and grind it into a 60-100 mesh sieve, weigh 0.3 g of water-quenched copper smelting slag after grinding, and place it in a 500 mm, in a cylindrical quartz glass fixed-bed reactor with an inner diameter of 10 mm. The tube furnace is used to control the reaction temperature, and the flue gas composition and concentration are simulated by a mass flow meter. The simulated flue gas atmosphere is 300 ppm NO, 400 ppm SO 2 , 20 ppm HCl, 8% H 2 O, 75 µg / m 3 Hg 0 The flue gas flow rate was 0.15 m / s, and the concentration of elemental mercury at the inlet and outlet of the reactor was monitored by a mercury meter. The removal rate of elemental mercury was as high as 95% at a reaction temperature of 250 °C.

Embodiment 3

[0032] Select a small amount of CuCl doped with a mass fraction of 1% 2 Nickel smelting water-quenching slag, after the doped nickel smelting water-quenching slag is dried and ground to a particle size of 200-300 μm, compressed air is used to spray the metal smelting water-quenching slag into the flue in front of the particle control equipment, and the sprayed nickel The mass ratio of smelting water-quenched slag to mercury in coal-fired flue gas is between 80000:1-100000:1. In the simulated coal-fired flue gas composition, 75µg / m 3 Hg 0 Under the initial mercury concentration, a mercury meter was used to monitor the concentration of elemental mercury at the inlet and outlet of the reactor, and the removal rate of elemental mercury was as high as 85% or more under the simulated flue gas composition at a reaction temperature of 180-300 °C.

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PUM

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Abstract

The invention discloses a flue gas mercury oxidation catalyst and application thereof. The flue gas mercury oxidation catalyst is metal smelting water quenched slag based on copper smelting or nickel smelting. The flue gas mercury oxidation catalyst has a very strong capability of catalytically oxidating elemental mercury in coal-fired flue gas, has a very high elemental mercury oxidating rate even under the condition that the concentration of hydrogen chloride in the flue gas is relatively low, can be recycled and reused by virtue of own magnetism, and does not affect the subsequent utilization of fly ash after entering the fly ash. The flue gas mercury oxidation catalyst is in contact with the flue gas through particle spraying, a fluidized bed or a fixed bed or other ways, and can achieve high-efficiency oxidation of the elemental mercury in the flue gas. The flue gas mercury oxidation catalyst and the application thereof have the advantages of simplicity, feasibility, less investment, no secondary pollution and the like, and have a wide market application prospect.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a flue gas mercury oxidation catalyst and its application. Background technique [0002] Mercury has been identified as a global environmental pollutant by the United Nations Environment Program (UNEP) due to its high toxicity, volatility, persistence, and bioaccumulation effects, and has attracted widespread attention from the international community. Human-made mercury enters the atmosphere, returns to the ground through dry and wet deposition, pollutes soil and water, and accumulates in the food chain, seriously endangering the health of animals, plants and humans. [0003] As the world's largest anthropogenic mercury emitter, my country's mercury emission control and legislation are relatively backward compared with developed countries. In recent years, with the inevitable requirements of sustainable economic and social development, the Chinese gove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/83B01D53/86B01D53/64
CPCB01D53/8665B01D2255/2022B01D2255/2027B01D2255/2045B01D2255/2047B01D2255/2065B01D2255/20738B01D2255/20761B01D2255/20792B01D2255/2092B01D2257/602B01J23/80B01J23/83
Inventor 李海龙张尾林
Owner CENT SOUTH UNIV
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