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Mercury removal adsorbent for flue gas as well as preparation method and application thereof

An adsorbent and mercury removal technology, which is applied in the field of air purification, can solve the problems of low mercury removal efficiency, achieve the effects of simple preparation method, avoid activity, and reduce energy consumption

Inactive Publication Date: 2017-05-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention proposes a mercury removal adsorbent for flue gas and its preparation method and application, the purpose of which is to solve the problem of mercury removal adsorbent for low-chlorine or even chlorine-free flue gas. The mercury removal efficiency is not high, the core technology is to use Ce with high active oxygen content (1-x) Zr x o 2 As the main component of mercury removal adsorbent, so as to oxidize and remove mercury in flue gas

Method used

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  • Mercury removal adsorbent for flue gas as well as preparation method and application thereof
  • Mercury removal adsorbent for flue gas as well as preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0028] The invention provides a mercury removal adsorbent for flue gas and its preparation method and application; the preparation method comprises the following steps:

[0029] S1. Select a cerium-zirconium-based solid solution with a particle size of 20 μm to 200 μm (ie Ce (1-x) Zr x o 2 ) powder is immersed in copper chloride solution for more than 3min, so that the Ce (1-x) Zr x o 2 Copper oxide is loaded on the surface of the powder; the concentration of the copper chloride solution is 10g / L to 500g / L, and the concentration of the copper chloride solution and the time of immersion will affect the Ce (1-x) Zr x o 2 Loading capacity of powder; the time of immersion is preferably 5min~10min, at this time, Ce (1-x) Zr x o 2 If the powder is immersed in an equal volume of copper chloride solution, it can absorb about 95% of copper chloride; if the soaking time is too long or the concentration is too high, the mass fraction of copper oxide will be high, otherwise it wi...

Embodiment 1

[0035] (1) Prepare cerium-zirconium solid solution powder by sol-gel method (for the preparation method, refer to the literature "Zhou etal.Manganese doped CeO 2 -ZrO 2 catalyst for elemental mercury oxidation at low temperature."(Fuel Processing Technology 152,285-293), its molecular formula is Ce 0.67 Zr 0.33 o 2 , the particle size range of powder particles ranges from 50 μm to 100 μm;

[0036] (2) immerse 5.64g of cerium-zirconium solid solution in an equal volume of 76g / L copper chloride aqueous solution for 5min;

[0037] (3) In an air atmosphere, the cerium-zirconium solid solution obtained in the step (2) was left to dry at 25°C for 24 hours, and then dried in an oven at 65°C for 12 hours to obtain powdered 6g loaded chloride The adsorbent of copper, the mass fraction of copper chloride in the adsorbent is 6%.

[0038] (4) The powdered adsorbent is extruded into a honeycomb adsorbent through a die. The length of the honeycomb adsorbent is 1200mm, the cross section...

Embodiment 2

[0040] Repeat Example 1 with the same steps as described, the difference is that in the step (4), the honeycomb adsorbent is installed after the economizer and dust collector.

[0041] The adsorbents of Examples 3-6 were prepared in the same steps as in Example 1, the specific preparation parameters are shown in Table 1, and the parameters and methods not listed in the table were the same as in Example 1.

[0042] Table 1

[0043]

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Abstract

The invention discloses a mercury removal adsorbent for flue gas as well as a preparation method and application thereof. The mercury removal adsorbent is prepared from 85 weight percent to 97 weight percent of Ce(1-x)ZrxO2 powder and 3 weight percent to 15 weight percent of copper chloride, wherein the grain diameter of the Ce(1-x)ZrxO2 powder is 20mum to 200mum; the copper chloride is loaded on the surface of the Ce(1-x)ZrxO2 powder. In a preparation process of the mercury removal adsorbent, calcination is not needed; the preparation method is simple and the activity of the copper chloride can be guaranteed; meanwhile, consumption of energy sources is reduced; when the mercury removal adsorbent is used for a low-chlorine or chlorine-free atmosphere, the mercury removal efficiency can still keep 80 percent or more for 10h under the condition that the air speed ratio of 380000h<-1>.

Description

technical field [0001] The invention belongs to the field of air purification, and more specifically relates to a mercury-removing adsorbent for flue gas and its preparation method and application. Background technique [0002] Coal is the main energy consumption in China. Mercury emitted by coal-fired power plants is the main source of man-made emissions into the atmosphere. Mercury released into the atmosphere will accumulate in the human body after entering the biosphere, seriously endangering human health. Due to the low content of halogen in coal in my country, and halogen is the key factor for the catalytic oxidation and adsorption of mercury, the main methods for removing mercury from coal-fired flue gas adsorbents are halogen-modified minerals or synthetic new adsorbents, such as the use of copper chloride for mercury removal. Modification with minerals or adsorbents. [0003] However, the adsorbents and catalysts of the prior art select metal oxides such as cerium o...

Claims

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Application Information

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IPC IPC(8): B01D53/02B01J20/30B01J20/06
CPCB01D53/02B01D2253/10B01D2257/602B01D2258/0283B01J20/0288B01J20/06
Inventor 周子健刘小伟徐明厚廖志强
Owner HUAZHONG UNIV OF SCI & TECH
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