High-temperature flue gas desulfurizer and preparation method thereof

A high-temperature flue gas and desulfurization agent technology, applied in the field of gas purification, to achieve the effects of inhibiting grain sintering and structural collapse, rich active sites, and uniform distribution of oxides

Pending Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many literatures and patents on new dry flue gas desulfurization, but most of them focus on the research of medium and low temperature flue gas desulfurization technology, and few desulfurization is carried out on high temperature flue gas above 500 °C

Method used

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  • High-temperature flue gas desulfurizer and preparation method thereof
  • High-temperature flue gas desulfurizer and preparation method thereof
  • High-temperature flue gas desulfurizer and preparation method thereof

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preparation example Construction

[0017] Some embodiments of the present invention provide a method for preparing a high-temperature flue gas desulfurizer, which includes: using a divalent metal ion salt and a water-soluble aluminum salt as raw materials, sequentially adopting a co-precipitation method and a hydrothermal crystallization method to prepare a A layered double metal hydroxide precursor with an aluminum hydrotalcite structure, and then the salt solution of the catalytically active component is embedded into the layered double metal hydroxide precursor through an exchange reaction to obtain the first slurry, and the first The slurry is molded and then roasted to obtain a high-temperature flue gas desulfurizer.

[0018] The inventors found that there are multiple valence states of sulfur in high-temperature flue gas SOx, and low-valence sulfur in flue gas, such as SO 2 , its reaction efficiency and product stability with basic oxides under high temperature conditions are insufficient, so it cannot be...

Embodiment 1

[0051] This embodiment provides a kind of preparation method of desulfurizer, and its concrete steps comprise:

[0052] (1) Preparation of layered magnesium aluminum double hydroxide precursor:

[0053] 230.8g of Mg(NO 3 ) 2 ·6H 2 O and 168.8g of Al(NO 3 ) 3 9H 2 O was dissolved in 750g deionized water to prepare a mixed salt solution, 145.8g NaOH was dissolved in 750g deionized water to prepare a lye, and 500g deionized water was added to a 3L beaker, and under rapid stirring conditions, the mixed salt solution was mixed with alkali The solution was slowly added into the beaker at the same speed, and after the dropwise addition was completed, the stirring was continued for a period of time to fully react the materials, and then transferred to a hydrothermal kettle for crystallization and aging at 90°C for 16 hours, and then the precipitate was separated by filtration and taken. The filter cake was washed with deionized water until neutral, dried and ground to obtain abo...

Embodiment 2

[0059] This embodiment provides a kind of preparation method of desulfurizer, and its concrete steps comprise:

[0060] (1) Preparation of layered magnesium aluminum double hydroxide precursor:

[0061] 230.8g of Mg(NO 3 ) 2 ·6H 2 O and 168.8g of Al(NO 3 ) 3 9H 2 O was dissolved in 750g deionized water to prepare a mixed salt solution, 145.8g NaOH was dissolved in 750g deionized water to prepare a lye, and 500g deionized water was added to a 3L beaker, and under rapid stirring conditions, the mixed salt solution was mixed with alkali The solution was slowly added into the beaker at the same speed, and after the dropwise addition was completed, continue to stir for a period of time to fully react the materials, then transfer to a hydrothermal kettle, crystallize and age for 14 hours at 100°C, then filter and separate the precipitate, and use Wash with deionized water until neutral, dry and grind to obtain about 87g layered magnesium aluminum double hydroxide precursor.

...

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Abstract

The invention discloses a high-temperature flue gas desulfurizer and a preparation method thereof. The preparation method comprises the steps: by taking divalent metal ion salt and water-soluble aluminum salt as raw materials, preparing a layered double-metal hydroxide precursor by adopting a coprecipitation method and a hydrothermal crystallization method in sequence; and embedding a salt solution of a catalytic active component into the layered double-metal hydroxide precursor through an exchange reaction, molding, and roasting to obtain the high-temperature flue gas desulfurizer. The desulfurizer prepared by the preparation method provided by the invention has the characteristics of large specific surface area, rich active sites and high dispersity, the sulfur capacity is up to 164 mg / g, the desulfurizer shows good desulfurization capacity, 100% regeneration can be realized after the desulfurizer is reduced by hydrogen for 10 minutes, and the desulfurizer has excellent regeneration capacity. Meanwhile, various oxides formed through high-temperature roasting are high in grain strength, the oxides with various crystal phase structures are uniformly distributed, the phenomena of grain sintering and structure collapse in a high-temperature environment can be effectively inhibited, and good high-temperature stability is achieved.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a high-temperature flue gas desulfurizer and a preparation method thereof. Background technique [0002] The source of air pollutant SOx is mainly the exhaust gas produced by the combustion process of fossil fuels and the smelting process of ore. These exhaust gas desulfurization methods mainly include three types: raw material desulfurization, desulfurization during production, and flue gas desulfurization. Flue gas desulfurization is currently the most effective and widely used desulfurization technology for controlling SOx emissions. According to the type of desulfurizer, flue gas desulfurization technology can be subdivided into dry desulfurization, semi-dry desulfurization and wet desulfurization, among which semi-dry and wet desulfurization technologies are widely used in the power, petrochemical and coal chemical industries, but there are desulfurization gypsum L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/83B01J35/08B01D53/86B01D53/56
CPCB01J23/002B01J23/10B01J23/83B01J35/08B01D53/8609B01J2523/00B01D2258/0283B01J2523/22B01J2523/31B01J2523/3712B01J2523/847B01J2523/27B01J2523/3706B01J2523/845
Inventor 李朝恒陈卫红裴旭东涂先红史朋武都军伟董宝华
Owner CHINA PETROLEUM & CHEM CORP
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