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Control method for coal-fired ultra fine particles based on modified kaolin

A technology of ultra-fine particles and control methods, applied in separation methods, chemical instruments and methods, fuels, etc., can solve the problems of large environmental pollution and low adsorption rate, and achieve convenient storage and transportation, stable component functions, and convenient production. Effect

Active Publication Date: 2015-04-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research shows that kaolin can more effectively reduce coal-fired ultrafine particles, and its adsorption rate for coal-fired ultrafine particles is about 31%. The adsorption rate is not high, and the discharge of ultrafine particles will cause greater environmental pollution.

Method used

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  • Control method for coal-fired ultra fine particles based on modified kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Preparation of hydrochloric acid modified kaolin powder Ⅰ:

[0067] 1) Calcining kaolin at 800°C for 2 hours;

[0068] 2) Add 1 g of kaolin per 7 mL of hydrochloric acid solution, add calcined kaolin to 4 mol / L hydrochloric acid solution, react for 3.5 hours in a constant temperature water bath at 80°C, and then perform centrifugation. Washing and separating to remove chloride ions to obtain hydrochloric acid modified kaolin;

[0069] 3) drying the hydrochloric acid modified kaolin at 80°C;

[0070] 4) After the dried hydrochloric acid modified kaolin is crushed and ground, it is screened with a 100-mesh sieve, and the powder passing through the sieve is collected to obtain hydrochloric acid modified kaolin powder.

[0071] According to the weight ratio of hydrochloric acid modified kaolin powder I to coal powder is 3:100, fully mix hydrochloric acid modified kaolin powder I and coal powder (particle size range 45-100 μm); mix hydrochloric acid modified kaolin powder ...

Embodiment 2

[0073] Preparation of hydrochloric acid modified kaolin powder II:

[0074] 1) Calcining kaolin at 950°C for 2 to 4 hours;

[0075] 2) Add 1 g of kaolin per 10 mL of hydrochloric acid solution, add the calcined kaolin to 3 mol / L hydrochloric acid solution, react for 2 hours in a constant temperature water bath with a temperature of 100 ° C, and perform centrifugation. Separating and removing chloride ions to obtain hydrochloric acid modified kaolin;

[0076] 3) drying the hydrochloric acid modified kaolin at 120°C;

[0077] 4) After the dried hydrochloric acid modified kaolin is crushed and ground, it is screened with a 300-mesh sieve, and the powder passing through the sieve is collected to obtain hydrochloric acid modified kaolin powder.

[0078] According to the weight ratio of hydrochloric acid modified kaolin powder II and coal powder of 4:100, fully mix hydrochloric acid modified kaolin powder II and coal powder (particle size range 45-100 μm); mix hydrochloric acid mo...

Embodiment 3

[0080] Preparation of hydrochloric acid modified kaolin powder III:

[0081] 1) Calcining kaolin at 1000°C for 4 hours;

[0082] 2) Add 1 g of kaolin per 9 mL of hydrochloric acid solution, add calcined kaolin to 5 mol / L hydrochloric acid solution, react for 4 hours in a constant temperature water bath at a temperature of 75 ° C, and then perform centrifugation. After several times of centrifugal washing Separating and removing chloride ions to obtain hydrochloric acid modified kaolin;

[0083] 3) drying the hydrochloric acid modified kaolin at 110°C;

[0084] 4) After the dried hydrochloric acid-modified kaolin is crushed and ground, it is screened with a 200-mesh sieve, and the powder passing through the sieve is collected to obtain hydrochloric acid-modified kaolin powder.

[0085]According to the ratio of hydrochloric acid modified kaolin powder III to coal powder weight ratio of 5:100, hydrochloric acid modified kaolin powder III and coal powder (particle size range 45-...

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Abstract

The invention discloses a control method for coal-fired ultra fine particles based on modified kaolin. The method comprises the following steps: 1) preparing a modified kaolin powder additive; 2) feeding the modified kaolin powder additive and pulverized coal to a coal mill at the mass ratio of (3:100) to (5:100), and mixing; and 3) feeding the pulverized coal mixed with the modified kaolin powder additive to a hearth to burn, trapping ultra fine particles generated by combustion of the pulverized coal through the modified kaolin powder additive, and trapping the particles formed by combining the modified kaolin powder additive with the ultra fine particles by virtue of a dust collection device after passing through a flue. Compared with the kaolin before being modification, the modified kaolin powder additive disclosed by the invention has the advantages that the physical and chemical characteristics are changed; the trapping capability of the coal-fired ultra fine particles is obviously improved; and the emission-reduction effect on the fine particles caused by the modified kaolin can be further improved.

Description

technical field [0001] The invention belongs to the field of coal-burning pollutant control, and more specifically relates to a method for controlling coal-burning ultrafine particles based on modified kaolin. Background technique [0002] In recent years, with the continuous development and popularization of my country's new energy technology, coal, as the most important energy source for the development of my country's national economy, although its proportion has declined somewhat, but based on my country's energy structure with more coal, less oil, and less gas, coal will be in the For a long time to come, it will still be the most important energy source in our country. Coal is mainly used for coal-fired power generation, and coal will produce many pollutants during the combustion process, such as SO X , NO X , CO 2 And particulate matter, etc., cause great damage to the environment and human body, produce the greenhouse effect, form acid rain to damage buildings and ...

Claims

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Application Information

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IPC IPC(8): C10L10/06B01D51/02
Inventor 刘小伟孙伟徐明厚王超徐义书陈栋
Owner HUAZHONG UNIV OF SCI & TECH
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