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Modified attapulgite flue gas desulfurization agent and preparation and application thereof

A technology of attapulgite and desulfurizer, applied in other chemical processes, separation of dispersed particles, chemical instruments and methods, etc., can solve the problems of poor mechanical strength, large heat loss, high cost, etc., and achieve adsorption capacity and selectivity Improvement, reduction of wear consumption, high mechanical strength effect

Inactive Publication Date: 2011-04-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1) The formability of activated carbon is poor, and other binders need to be added, which affects the structural characteristics and desulfurization performance of activated carbon
[0009] 2) The mechanical strength is poor, and the loss caused by mechanical wear during recycling is relatively large
[0010] 3) The thermal stability is poor, and the loss of heat loss during the regeneration process is large
[0011] 4) The cost is high, which comes from coal quality and biomass, which itself is the consumption of energy

Method used

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  • Modified attapulgite flue gas desulfurization agent and preparation and application thereof
  • Modified attapulgite flue gas desulfurization agent and preparation and application thereof
  • Modified attapulgite flue gas desulfurization agent and preparation and application thereof

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Effect test

Embodiment 1

[0034] The modified attapulgite flue gas desulfurizer in this embodiment is attapulgite activated by heat treatment.

[0035] The preparation method of the modified attapulgite flue gas desulfurizer in this embodiment is carried out as follows:

[0036] a. The attapulgite clay is extruded by pair of rollers, and then dried and pulverized to obtain a powder with a particle size of 200 mesh;

[0037] b. Add distilled water to the attapulgite powder, stir at a high speed to form a suspension, and then centrifuge and dry to obtain an attapulgite sample; wherein the mass volume ratio of attapulgite to distilled water is 1g: 4mL;

[0038] c, the attapulgite sample is crushed and screened, and the selected particle size is 20-40 mesh as a spare;

[0039] d. Put 3 g of the spare product into a fixed-bed reactor, raise the temperature to 50° C. under nitrogen atmosphere, and perform constant temperature treatment at 50° C. for 2 hours to obtain a desulfurizer.

[0040] The applicatio...

Embodiment 2

[0043] The modified attapulgite flue gas desulfurizer in this embodiment is attapulgite activated by heat treatment.

[0044] The preparation method of the modified attapulgite flue gas desulfurizer in this embodiment is carried out as follows:

[0045] a. The attapulgite clay is extruded by pair of rollers, and then dried and pulverized to obtain a powder with a particle size of 200 mesh;

[0046] b. Add distilled water to the attapulgite powder, stir at a high speed to form a suspension, then centrifuge and dry to obtain an attapulgite sample; wherein the mass volume ratio of attapulgite to distilled water is 1g: 8mL;

[0047] c, the attapulgite sample is crushed and screened, and the selected particle size is 20-40 mesh as a spare;

[0048] d. Put 3 g of the spare product into a fixed-bed reactor, raise the temperature to 150° C. under nitrogen atmosphere, and perform constant temperature treatment at 150° C. for 2 hours to obtain a desulfurizer.

[0049] The application ...

Embodiment 3

[0052] The modified attapulgite flue gas desulfurizer in this embodiment is attapulgite activated by heat treatment.

[0053] The preparation method of the modified attapulgite flue gas desulfurizer in this embodiment is carried out as follows:

[0054] a. The attapulgite clay is extruded by pair of rollers, and then dried and pulverized to obtain a powder with a particle size of 200 mesh;

[0055] b. Add distilled water to the attapulgite powder, stir at a high speed to form a suspension, then centrifuge and dry to obtain an attapulgite sample; wherein the mass volume ratio of attapulgite to distilled water is 1g: 5mL;

[0056] c, the attapulgite sample is crushed and screened, and the selected particle size is 20-40 mesh as a spare;

[0057] d. Put 3 g of the spare product into a fixed-bed reactor, raise the temperature to 400° C. under nitrogen atmosphere, and perform constant temperature treatment at 400° C. for 2 hours to obtain a desulfurizer.

[0058] The application ...

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Abstract

The invention discloses a modified attapulgite flue gas desulfurization agent and preparation and application thereof. The flue gas desulfurization agent is attapulgite activated by thermal treatment. A preparation method comprises the following steps: extruding attapulgite clay with double rollers; drying and crushing to obtain powder the particle size of which is 200 meshes; adding distilled water into the powder, and stirring to obtain suspension; centrifuging and drying to obtain an attapulgite sample; crushing, then screening the attapulgite sample and adding the obtained product in a fixed bed reactor; performing thermal treatment in nitrogen atmosphere to obtain the desulfurization agent with sulfur capacity of 252-2,331 mg of SO2 / 100 g; adding the desulfurization agent in the fixed bed reactor, wherein the reaction temperature is controlled between 50 and 200 DEG C; and introducing normal-pressure flue gas, wherein the air speed is 4,128.3 h<-1>. In the invention, the attapulgite used is clay ore, which swells in water and is easy to form when dried; and after proper thermal treatment, the shape is kept unchanged; moreover, the attapulgite has relatively high mechanical strength and can relatively remarkably reduce the abrasion loss.

Description

1. Technical field [0001] The invention relates to the sulfur dioxide treatment of coal-fired flue gas in the technical field of environmental protection, in particular to a modified attapulgite flue gas desulfurizer, its preparation and application method. 2. Background technology [0002] my country is a large coal-producing and coal-consuming country, and high-sulfur coal is widely distributed. It is estimated that by 2020, coal production will reach 3 billion tons. It is estimated that the environmental capacity for the concentration of sulfur dioxide in my country's atmosphere to meet the national quality secondary standard is 1,200 tons, while the SO2 emitted by coal combustion 2 More than 20 million tons for many consecutive years, resulting in acid rain and SO 2 Pollution is becoming more and more serious, and the pH value of acid rain in severe areas is as low as 3.24, so for SO 2 emission control needs to be solved urgently. [0003] Coal-fired flue gas desulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30B01D53/04
Inventor 张先龙姜伟平吴雪平时博文杨保俊
Owner HEFEI UNIV OF TECH
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