Method for removing total mercury from coal burning smoke

A coal-fired flue gas removal technology, which is applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of difficult removal, large addition amount, and increased operation difficulty, and achieves simple method and convenient operation. Effect

Inactive Publication Date: 2010-10-06
SOUTH CHINA UNIV OF TECH
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] Through analysis, we found that this technology still has two deficiencies: (1) Na 2 S 4 The amount of addition is particularly large, and the cost of mercury removal is very expensive
This has also greatly increased the cost of mercury removal (as we have learned: Na 2 S 4 The market price is about 6000 yuan/t, the content is 30%)
(2) There are problems in the mechanism of mercury removal
[0040] A higher mercury removal rate can be obtained by using the PAC injection method, but the particle size of the activated carbon is extremel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0063] Example 1

[0064] The concentration of sulfur dioxide in the coal-fired flue gas of a power plant in Guangdong is 1300 mg / Nm 3 , the total mercury content in the flue gas is 11.1 μg / Nm 3. The plant uses lime (stone)-gypsum wet method for flue gas desulfurization, and the desulfurization rate is 87Wt.%. Add 3mol / L alkali sulfide solution accounting for 1.5‰ of its volume to the lime (stone) circulating absorbent (ie desulfurizer), and after mixing evenly, desulfurization and mercury removal are carried out in the absorption tower, and the desulfurization rate is stable at 84-93 Within the range of %, the total mercury content in the treated flue gas is only 2.3 μg / Nm 3 , the mercury removal rate reached 79.3%. The removal cost is low and the operation is convenient. And it will not cause secondary pollution to the environment.

Example Embodiment

[0065] Example 2

[0066] The concentration of sulfur dioxide in the flue gas of an industrial boiler factory in Guangzhou is 95 mg / Nm 3 , the total mercury content in the flue gas is 14.8 μg / Nm 3 . The plant adopts lime (stone)-gypsum wet method for flue gas desulfurization, and the desulfurization rate is above 85Wt.%. A 3mol / L alkali sulfide solution with a volume of 4‰ is added to the lime (stone) circulating absorbent. After mixing evenly, desulfurization and mercury removal are carried out in the absorption tower. Under the condition that the desulfurization rate is still stable above 85%, after treatment The total mercury content in the flue gas is only 3.2 μg / Nm 3 , the mercury removal rate reached 78.4%. The removal cost is low and the operation is convenient. And it will not cause secondary pollution to the environment.

Example Embodiment

[0067] Example 3

[0068] The concentration of sulfur dioxide in the flue gas of a thermal power plant in Shaoguan, Guangdong is 1400mg / Nm 3 , the total mercury content in the flue gas is 17.9 μg / Nm 3 . The plant uses lime (stone)-gypsum wet method for flue gas desulfurization, with an average desulfurization rate of 84%. Add 2.4mol / L alkali sulfide solution of 9 / 10,000 by volume to the lime (stone) circulating absorbent. After mixing evenly, desulfurization and mercury removal are carried out in the absorption tower, and the desulfurization rate is stable in the range of 81-87%. , the total mercury content in the treated flue gas is only 5.8 μg / Nm 3 , the mercury removal rate reached 67.6%. The removal cost is low and the operation is convenient. And it will not cause secondary pollution to the environment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Removal rateaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for removing total mercury from coal burning smoke, which comprises the following steps of: mixing a lime (limestone) desulfurizing agent and a sodium sulfide mercury remover uniformly, spraying the uniformly mixed solution into a desulfurizing tower during lime (limestone)-gypsum wet smoke desulfuration, and removing the total mercury from the smoke at the same time during the lime (limestone)-gypsum wet smoke desulfuration. The method is simple and convenient to operate, does not need great reformation on the conventional desulfuration facilities, has lower mercury removal cost, and does not produce secondary pollution to the environment.

Description

technical field [0001] The invention relates to a method for removing mercury pollutants in coal-fired flue gas, in particular to a method for removing mercury pollutants in flue gas discharged by coal-fired enterprises such as major power plants and industrial boiler factories. Background technique [0002] Mercury has become the most concerned air pollutant of toxic metal elements due to its unique volatility, persistence and bioaccumulation. 2 and NO X Then there is another category of air pollutants that need to be controlled on a large scale. According to statistics: the global annual atmospheric mercury emission caused by human factors is 2000-3400t. Among them, the mercury emissions caused by coal burning process accounted for about 1 / 3, becoming the largest source of man-made mercury pollution. [0003] my country is a country where coal is the main energy source, and coal accounts for about 2 / 3 of the primary energy consumption. Analysis of coal samples from maj...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D53/78B01D53/50B01D53/64
Inventor 石林
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap