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System and method for removing pollutants in coal-fired flue gas

A coal-fired flue gas and pollutant technology, applied in the field of flue gas purification, can solve the problems of low pollutant removal efficiency and affecting the removal efficiency of adsorbents, and achieve the effect of improving removal efficiency

Inactive Publication Date: 2021-06-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first way is to inject the unmodified adsorbent directly into the flue, which has a low removal efficiency for pollutants; the second way is to inject the modified adsorbent into the flue, which Because the modifier will be filled into the pores of the raw material (such as fly ash or activated carbon, that is, the adsorbent in the first method is the raw material) during the modification process, this will affect the desorption of the modified adsorbent. removal efficiency

Method used

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  • System and method for removing pollutants in coal-fired flue gas
  • System and method for removing pollutants in coal-fired flue gas
  • System and method for removing pollutants in coal-fired flue gas

Examples

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Embodiment 1

[0061] Such as figure 1 As shown, an embodiment of the present application provides a system for removing pollutants in coal-fired flue gas. The system includes a boiler 11, a denitrification device 12, an air preheater 13, an electrostatic Dust collector 14, desulfurization device 15 and chimney 16;

[0062] The system also includes a bypass system 20, and the bypass system 20 includes: a first heating device 21, a reaction kettle 22, a second heating device 23, a pickling device 24 and a spraying device 25;

[0063] The first end of the first heating device 21 is connected to the electrostatic precipitator, and the first heating device 21 is used to receive and heat the mixture of sodium hydroxide and fly ash produced by the electrostatic precipitator to obtain aluminosilicate;

[0064] The first end of the reactor 22 is connected to the second end of the first heating device 21, and the reactor 22 is used for static aging, crystallization and drying of the solution contain...

Embodiment 2

[0075] Different from the first embodiment, on the basis of the first embodiment, the system provided by the second embodiment further includes a grinding device. Such as figure 2 As shown, the bypass system 20 also includes a grinding device 26;

[0076] The first end of the grinding device 26 is connected to the electrostatic precipitator, and the second end of the grinding device 26 is connected to the first end of the first heating device 21. The grinding device 26 is used to receive and grind sodium hydroxide and the fly ash produced by the electrostatic precipitator the mixed mixture;

[0077] The first heating device 21 is used to receive and heat the mixture obtained from the grinding device 26 .

[0078] In this embodiment, setting the grinding device can help increase the specific surface area of ​​the fly ash, so that the contact area and probability of the sodium hydroxide on the surface of the fly ash and the silicon-aluminum element are larger, thereby produci...

Embodiment 3

[0080] Different from the first embodiment, on the basis of the first embodiment, the system provided by the third embodiment further includes an extraction device. Such as image 3 As shown, the bypass system 20 also includes an extraction device 27;

[0081] The first end of the extraction device 27 is connected to the second end of the first heating device 21, and the second end of the extraction device 27 is connected to the first end of the reaction kettle 22. The extraction device 27 is used to contain the silicon aluminum obtained by the first heating device 21. The acid salt solution is extracted to obtain rare earth ions;

[0082] The reaction kettle 22 is used for static aging, crystallization and drying of the solution extracted by the extraction device 27 .

[0083] In this embodiment, since the fly ash contains more rare earth elements, the rare earth elements in the fly ash can be extracted by setting an extraction device for recycling.

[0084] Further, the e...

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Abstract

The invention relates to the technical field of flue gas purification, in particular to a system and method for removing pollutants in coal-fired flue gas. In the system and the method, a first heating device is used for receiving and heating a mixture formed by mixing sodium hydroxide and fly ash generated by an electrostatic dust collector to obtain aluminosilicate; a reaction kettle is used for carrying out standing aging, crystallization and drying molding on a solution containing the aluminosilicate obtained by the first heating device to obtain a zeolite molecular sieve; a second heating device is used for receiving and heating a carbon-containing substance and the zeolite molecular sieve obtained by the reaction kettle, so that carbon atoms in the carbon-containing substance are deposited into pore channels of the zeolite molecular sieve; the carbon-containing substance is gas or liquid; a pickling device is used for removing the aluminosilicate in the zeolite molecular sieve obtained by the second heating device by using acid liquor; and a spraying device is used for spraying a product obtained by the pickling device into a flue. According to the scheme, the removal efficiency of the pollutants in the coal-fired flue gas can be improved.

Description

technical field [0001] The present application relates to the technical field of flue gas purification, in particular to a system and method for removing pollutants in coal-fired flue gas. Background technique [0002] Coal combustion flue gas contains mercury (Hg), selenium (Se), lead (Pb) and other heavy metal elements. Heavy metal elements and their compounds have strong biological toxicity at low concentrations, causing immeasurable damage to the ecological environment and human health. damage. VOC (Volatile Organic Compounds) is also one of the pollutants in coal-fired flue gas. It not only directly damages human health, but also easily reacts with nitrogen oxides under certain conditions to form photochemical smog and cause secondary pollution. There is also SO in the flue gas of coal combustion 3 And other harmful gases, also need to be controlled. [0003] At present, for various pollutants in the flue gas of coal-fired power plants, the relatively mature method i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/00F23J15/02
CPCF23J15/006F23J15/02F23J15/025F23J2217/102F23J2215/10F23J2215/20
Inventor 汪涛薛逢皇张永生王家伟潘伟平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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